US3776250A - Float collar with differential fill feature - Google Patents
Float collar with differential fill feature Download PDFInfo
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- US3776250A US3776250A US00243726A US3776250DA US3776250A US 3776250 A US3776250 A US 3776250A US 00243726 A US00243726 A US 00243726A US 3776250D A US3776250D A US 3776250DA US 3776250 A US3776250 A US 3776250A
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- Prior art keywords
- valve
- stem
- tubular body
- seat
- casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0426—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with seat protecting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/1624—Destructible or deformable element controlled
- Y10T137/1632—Destructible element
- Y10T137/1789—Having pressure responsive valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7838—Plural
- Y10T137/7842—Diverse types
Definitions
- a valved collar for allowing a pipe string to fill up as it is lowered in a bore hole while controlling the rate of fill up through a differential fill feature utilizes a valve plunger in a valve body with the plunger opening against spring means and having an elastomeric collar intermediately located on the plunger shaft for allowing fill up to occur above a predetermined differential pressure
- FIG? 7 FLOAT COLLARWITII DIFFERENTIAL FILL FEATURE BACKGROUND OF THE INVENTION
- the bore hole containstsome fluid which must be partially displaced by the.casing when running-in. If the fluid is not allowed to flow into the casing as it goes into the hole, the casingwill become completely buoyant after reaching a certain-depth and further insertion of the casing becomes increasingly difficult and dangerous. If the casing is inserted into the fluid far enough the hydrostatic pressureon it could cause collapse of the casing.
- the present invention unlike the; prior art devices,
- the prior art devices also lack ausatisfactory means of circulating downward through theself-fill valve without causing the self-fill valve to transform into the back-flow valve until desired.
- the present invention which;..provides in acasing string a valve assembly-having a flowrate valveelement which can be selectively. converted into a check valve.
- the assembly provides an upwardly opening differential fill-valve arrangement for allowing the fluid in the annulus to flow into thecasing as the casing is being run-in the hole.
- Another feature is that fluid can be flowed in both directions through the valve assembly to circulate and reverse circulate fluid through the valve .until it is desirable to transform the valve assembly into a check valve allowing flow in. one direction only, and preventing back-flow therethrough.
- FIG. 1 is -a cross-sectional view of the float collar as it is placed into the casing string prior to run-in of the casing.
- FIG. 2 illustrates the position of the valve assembly as the casing is being run-in.
- FIG. 3 illustrates the valve assembly-during a limited .flow rate circulation through the valve assembly into the bore hole.
- FIG. 4 illustrates the valve assembly during cementing after it has-been transformed into a check-valve type assembly.
- FIG. 5 is a view of the float collar after cementing is completed.
- FIG, 6 is a top view of the float collar taken at line 6-6 in FIG. 1.
- FIG. .7 is an alternative embodiment. of the float collar having an alternate lower valve: arrangement.
- the float collar 1 comprises an outer cylindrical housing 2 made of a durable material such-as steel. Centered within the housing 2 by concrete fill 3 is the lower valve body 4 and upper valve body 5 joined together by a. releasable connection such as matching threads 6.
- Lower valve body 4 hasan integral valve guide 7 with ..a bore 1 passage extending vertically ,therethrough lo- ...catedcentrally therein and one or more vanes 8 passing from valve guide 7 to the outer wall 9 ,o'fi,the lower valve body and further defining flow parts 10 through the lower valve body.
- Valve body 4 also contains a lower central recessed opening 11 communicating with the flow ports 10.
- valve member 12 Passing through valve guide 7 andrin slidable relationship therewith is valve member 12 having, plunger head 13, valve stem 14, and threaded rod lshllunger head 13 has conical valve surface .16 which matches upper valve seat'17 formed in upper valve bOdy SJ'EIastomericcovering 1.8 sufficiently encases plunger head 13 to provide better sealing engagement between head.
- Plunger head 13 has an integral collar 19 formed at the bottom thereof, around stem 14,:;and of substantially the same diameter as the upper part of valve guide 7. Also formeddn the plunger'z'head l3sattthe junction of collar 19 and the plunger head is spring recess 20 arranged to receive coil spring 21 which passes in fitting arrangement over collar 19 and the upper shoulder 22 of valve guide 7.
- Valve stem 14 passes through valve guide 7 and extends into recess 11 and out past the bottom 23 of lower body 4.
- Elastomeric valve ring 24 is located aboutvalve stem 14 within recess 11 and has upper sleeve 25, intermediate shoulder 26', and sealing shoulder 27.
- Valve ring 24 is retained on valve stem 14 by retainer washer 37 located below ring 24 and slidably mounted on' a lower bolt 28 which is threaded onto threaded rod 15.
- Encasing lower bolt 28 is bolt housing 29 which is a cylindrical tubular housing having an upper bore passage 30 and an enlarged lower passage 31 which lower passage defines an annular recess 32 between bolt 28 and housing 29.
- Bolt 28 has a lower enlarged portion 33 which' is formed by an annular shoulder 34 passing circumferentially around the lower portion of the bolt.
- the annular shoulder 34 is just large enough to leave a small annular gap 35 between the shoulder and the enlarged lower bore 31 in housing 29.
- shear pin 36 Passing transversely through housing 29 and bolt 28 through shoulder 34 is shear pin 36 which serves to attach housing 29 to bolt 28 in the uppermost position of housing 29. In this uppermost position as shown in FIGS. 1 through 3, housing 29 abuts retainerwasher 37 and maintains valve ring 24 substantially within recessed opening 11 in lower valve body 4.
- Coil spring 21 which is in acompressed position in FIGS. 1 through 3 and pushes down against valve body 4 and upward against plunger head 13, works through valve stem 14, threaded rod 15, lower bolt 28, shear pin 36 andhousing 29 to maintain washer 37 and valve ring 24 in their upper initial position as shown in FIG. 1.
- Spring 21 also biases plunger head 13 toward valve seat 17 and has sufficient travel to seat head 13 in valve seat 17 when bolt 28 has been freed from housing 29 allowing the plunger head to move upward.
- the float collar as shown in FIG. 1 is inserted in the casing string either at the bottom or at one or two joints up from the bottom. After the casing string is made up, it is run in the well and the float collar assumes the position as shown in FIG. 2.
- the elastomeric valve ring 24 has been pressed into the opening 11. This occurs because the sealing shoulder 27 of ring 24 sealingly engages the wall of opening 11 and, due to the fluid in the bore hole and the unfilled area in the casing, a differential pressure arises across valve ring 24 immediately upon entering the bore hole fluid with the casing.
- valve ring 24 moves out of opening 11 thereby fully opening ports 10 into open bore 39.
- Housing 29 drops down until shoulder 41 of the housing abuts shoulder 34 of the bolt, thereby preventing the housing from dropping off of the float collar and possibly interfering with any tools which may be located below the float collar.
- valve ring 24 The advantages achieved by the use of this invention are partly a result of the ability of the valve ring 24 to compress sufficiently to allow the casing string to fill up as it enters the bore hole. Due to the limited ability of the valve ring to compress, a flow restrictive orifice is always present during back-flow between the valve ring and the lower end 23 of the lower valve body 4, thereby tending to prevent the casing from filling too quickly and overflowing at the surface.
- the present device utilizes a rather lengthy valve ring 24.
- the valve ring is advantageous over the washer due to the tendency of the washer to extrude out of position in high pressure hot wells and also due to the lateral movement of the valve stem which can occur within the rather loose-fitting valve guide.
- the present invention also allows the casing to be filled at a controlled rate regardless of how high the pressure differential is between the bore hole and the casing bore, whereas if too high a pressure difierential occurs across the prior art devices, the casing string must be pulled upward in the hole or filled from the surface to reduce the pressure differential and allow further back-flowing.
- the present invention allows the fluid to be forwardflowed or back-flowed as many times as desired as long as the conversion flow rate is not reached. As soon as the operator desires to convert to check-valve type operation (for instance, to begin cementing), this is easily and simply achieved from the surface without having to drop mechanical devices through the casing or run a stinger into the casing. The conversion is easily accomplished by increasing flow rates through the casing to above the present conversion flow rate.
- All the parts of the present invention within the housing 2 can be made of easily drilled materials such as concrete, plastic, rubber, aluminum and brass, to allow the collar to be drilled out after the cementing operation has been completed and the cement set up. The drilling out leaves a full-open passage through the collar to pass other tools down the casing for further work, production or testing.
- Valve apparatus for controlling flow and backflow of a fluid through a pipe string in a well during run-in and cementing operations, comprising:
- a. tubular body means having a bore passage therethrough;
- valve seat means within said tubular body
- first valve member means located movably within said body adapted to seat in said valve seat means in fluidically sealed engagement, and having a longitudinalaxial valve stem attached thereto;
- valve guide means slidably enclosing a portion of said valve stem and allowing longitudinal movement of said valve stem therethrough, said valve guide means being connected to said tubular body;
- 1' means dividing the bore passage through said tubular body means into an upper chamber, a lower chamber and a lower bore passage, said upper chamber containing said first valve member means and said spring means;
- resilient second valve member means located within said lower chamber and arranged to control fluid flow to and from said upper chamber through said port means and said lower chamber from said lower bore passage; said second valve member means further comprising a resilient elastomeric sleeve having an extended sleeve portion capable of being compressed into a shorter bulging member, and having one or more annular exterior shoulders capable of sealingly engaging the inner wall of said lower chamber and closing off said lower chamber to fluid flow therethrough; said sleeve providing an opening bias for said exterior shoulders;
- frangible means between said holding means and said valve stem and arranged to selectively release said holding means thereby allowing said first valve means to move upward sufficiently enough to seat in said valve seat means, and simultaneously allowing said second valve means to move downward allowing full fluid communication between said upper chamber, said lower chamber, and said lower bore passage.
- said resilient second valve member means further comprises a thin rigid retainer member adapted to transmit compressive forces to said elastorneric sleeve; and said elastomeric sleeve is further adapted to compress enough under a predetermined differential pressure to move said annular exterior shoulders a sufiicient distance to expose said port means to said lower bore passage.
- tubular body means further comprises a tough metallic outer housing, a drillable inner housing located concentrically and centrally within said outer housing and spaced a predetermined distance therefrom and a drillable composite material between said inner housing and said outer housing.
- said outer housing is made of steel; said inner housing is comprised of an upper body removably connected to a lower body, both made of high strength drillable plastic; and said composite material comprises drillable concrete which was flowed in wet slurry form into the space between said inner housing and said outer housing and allowed to harden.
- said first valve members means comprises a plungerhead having a conical surface adapted to seat in said valve seat means in sealing engagement and said valve stem further comprises an upper stem and a lower stem assembly, said upper stem being connected to said plunger head and said lower stem assembly being fixedly attached by removable connector means to said upper stem, said lower stem assembly further comprising an inner rod member attached to said removable connector means and having an enlarged lower end defining an annular perpendicular shoulder, and a tubular case telescopically mounted over said rod member and attached thereto by said frangible means, said case having an inner annular shoulder projecting inward arranged to abut said annular perpendicular shoulder upon shearing of said frangible means.
- said first valve means further comprises an elastomeric cover located on said plunger head and adapted to contact said valve seat means and provide sealing engagement between said plunger head and said valve seat means, and said elastomeric cover further comprises an annular lip extending past said plunger head periphery and adapted to receive fluid back-flow and provide further sealing arrangements with said valve seat means.
- valve guide means is connected to said tubular body means by one or more vane members attached to said valve guide means and said tubular body means; said vane members serving to define said port means by their passage through the space between said valve guide means and said tubular body means.
- valve guide means further comprises a generally cylindrical collar arranged to encircle said valve stem in slidable relationship and having an upper portion extending above said vane members, said upper portion adapted to receive said spring means in abutting relationship.
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Abstract
A valved collar for allowing a pipe string to fill up as it is lowered in a bore hole while controlling the rate of fill up through a differential fill feature, utilizes a valve plunger in a valve body with the plunger opening against spring means and having an elastomeric collar intermediately located on the plunger shaft for allowing fill up to occur above a predetermined differential pressure.
Description
United States Patent [191 Knox Dec. 4, 1973 [54] FLOAT COLLAR WITH DIFFERENTIAL 3,385,370 5/1968 Knox et a]. 166/225 LL FEATURE 3,385,372 5/1968 Knox 166/225 Inventor: Lloyd C. Knox, Duncan, Okla.
Halliburton Company, Duncan, Okla.
Filed: Apr. 13, 1972 Appl. No.: 243,726
Assignee:
US. Cl 137/71, l37/512.3, 137/525, 166/225 Int. Cl. F161: 15/06, E21b 33/00 Field of Search 137/68, 71, 515, 137/512.3; 166/224, 225
References Cited UNITED STATES PATENTS 9/1955 Baker 137/68 X Primary Examiner-Martin P. Schwadron Assistant Examiner -Richard Gerard Attorney-John H. Tregoning et a].
[5 7 ABSTRACT A valved collar for allowing a pipe string to fill up as it is lowered in a bore hole while controlling the rate of fill up through a differential fill feature, utilizes a valve plunger in a valve body with the plunger opening against spring means and having an elastomeric collar intermediately located on the plunger shaft for allowing fill up to occur above a predetermined differential pressure,
8 Claims, 7 Drawing Figures PATENTEUUEC 4 I975 SHKET 10? 3 FIG] SHEET 2 U? MTENTED DEC 4 I975 FIG. 4
MENTED DEC 4 I975 SHEEY 3 U? 3 FIG. 6
FIG. 5
FIG? 7 FLOAT COLLARWITII DIFFERENTIAL FILL FEATURE BACKGROUND OF THE INVENTION In preparing an oil well bore hole for production, it is desirable to run in awstring of casing and cement the space between the casing and the borehole. Usually, the bore hole containstsome fluid which must be partially displaced by the.casing when running-in. If the fluid is not allowed to flow into the casing as it goes into the hole, the casingwill become completely buoyant after reaching a certain-depth and further insertion of the casing becomes increasingly difficult and dangerous. If the casing is inserted into the fluid far enough the hydrostatic pressureon it could cause collapse of the casing.
To prevent this buoyancy effect and possible casin collapse, it has long been the practice to place at or near the bottom of the casing string a valved collar or shoe which allows the fluid to flow into the casing as it is being run-in.
The difficulties encountered in this type of tool have been to develop a valve that would allow the fluid to flow into the casing at a-precontrolled rate during running-in, then allow the fluid to be pumped out of the casing after it is in place andalso allow cement slurry to be pumped down the casing and back up the annulus between the casing andithe bore hole, with the valve then being capable of sealing off the casing so that none of the cement slurry can backflow out of the annulus and back into the casing.
After the cementing-operation the float collar must act as a back pressure valve while during the running-in of the casing it must act just the opposite and serve as a self-till valve, allowing fluid to flow into the casing. Thus, several valves whch are seemingly incompatible are required in carrying out casing placement, cementing and related operations. One conventional method aof controlling the flow in a well casing is to use plug,
members'or balls whichare dropped through'the casing string to trip a valve or'seat in a valve to open or close itsi'ltwis-.:clear.tthat if such valves are used, it would be necessary to have a clear passage through the entire casing stringtopermit the plugmembers or balls to pass down through the casing to the valves near the bottom. If intermediate tools are inserted in the casing string, such as multiple stage cementing tools or packers, then the use of plugs or balls to operate valves below. these tools may be'awkward, oneven impossible.
more dependable operation.
The present invention,: unlike the; prior art devices,
allows fluid to flow into the casing regardless of how high the pressure differential may be between the annulus and the casing bore. This obviates the necessity of filling. the casing with 'fluid from the top in order to open the self-fill valve when the casing has been run-in too quickly. and built up too high a,differential pressure between the casing and the annulus.
The prior art devices also lack ausatisfactory means of circulating downward through theself-fill valve without causing the self-fill valve to transform into the back-flow valve until desired.
- Thetdisadvantages of the prior art-..devices areover- 'cometby. the present invention which;..provides in acasing string a valve assembly-having a flowrate valveelement which can be selectively. converted into a check valve. The assembly provides an upwardly opening differential fill-valve arrangement for allowing the fluid in the annulus to flow into thecasing as the casing is being run-in the hole. Another feature is that fluid can be flowed in both directions through the valve assembly to circulate and reverse circulate fluid through the valve .until it is desirable to transform the valve assembly into a check valve allowing flow in. one direction only, and preventing back-flow therethrough.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is -a cross-sectional view of the float collar as it is placed into the casing string prior to run-in of the casing.
FIG. 2 illustrates the position of the valve assembly as the casing is being run-in.
FIG. 3 illustrates the valve assembly-during a limited .flow rate circulation through the valve assembly into the bore hole. a
FIG. 4 illustrates the valve assembly during cementing after it has-been transformed into a check-valve type assembly.
FIG. 5 is a view of the float collar after cementing is completed.
FIG, 6 is a top view of the float collar taken at line 6-6 in FIG. 1.
FIG. .7 is an alternative embodiment. of the float collar having an alternate lower valve: arrangement.
DESCRIPTION OF THE "PREFERRED EMBODIMENTS In FIG. 1 the float collar 1 comprises an outer cylindrical housing 2 made of a durable material such-as steel. Centered within the housing 2 by concrete fill 3 is the lower valve body 4 and upper valve body 5 joined together by a. releasable connection such as matching threads 6.
Passing through valve guide 7 andrin slidable relationship therewith is valve member 12 having, plunger head 13, valve stem 14, and threaded rod lshllunger head 13 has conical valve surface .16 which matches upper valve seat'17 formed in upper valve bOdy SJ'EIastomericcovering 1.8 sufficiently encases plunger head 13 to provide better sealing engagement between head.
13 and valve seat 17.
Valve stem 14 passes through valve guide 7 and extends into recess 11 and out past the bottom 23 of lower body 4. Elastomeric valve ring 24 is located aboutvalve stem 14 within recess 11 and has upper sleeve 25, intermediate shoulder 26', and sealing shoulder 27. Valve ring 24 is retained on valve stem 14 by retainer washer 37 located below ring 24 and slidably mounted on' a lower bolt 28 which is threaded onto threaded rod 15. Encasing lower bolt 28 is bolt housing 29 which is a cylindrical tubular housing having an upper bore passage 30 and an enlarged lower passage 31 which lower passage defines an annular recess 32 between bolt 28 and housing 29.
Passing transversely through housing 29 and bolt 28 through shoulder 34 is shear pin 36 which serves to attach housing 29 to bolt 28 in the uppermost position of housing 29. In this uppermost position as shown in FIGS. 1 through 3, housing 29 abuts retainerwasher 37 and maintains valve ring 24 substantially within recessed opening 11 in lower valve body 4.
' Coil spring 21 which is in acompressed position in FIGS. 1 through 3 and pushes down against valve body 4 and upward against plunger head 13, works through valve stem 14, threaded rod 15, lower bolt 28, shear pin 36 andhousing 29 to maintain washer 37 and valve ring 24 in their upper initial position as shown in FIG. 1.
In operation, the float collar as shown in FIG. 1 is inserted in the casing string either at the bottom or at one or two joints up from the bottom. After the casing string is made up, it is run in the well and the float collar assumes the position as shown in FIG. 2. In FIG. 2 the elastomeric valve ring 24 has been pressed into the opening 11. This occurs because the sealing shoulder 27 of ring 24 sealingly engages the wall of opening 11 and, due to the fluid in the bore hole and the unfilled area in the casing, a differential pressure arises across valve ring 24 immediately upon entering the bore hole fluid with the casing. As the casing progresses deeper into the bore hole fluid, the differential pressure across shoulder 27 increases compressing the valve ring, causing sleeve 25 to bulge and take up the compression forced on it by pressure on shoulder 27. As the sleeve 25 bulges and is compressed as shown in FIG. 2, shoulder 27 moves upward into the opening 11. At a predetermined differential pressure, preset by adjusting the length and stiffness of valve ring 24,,shoulder 27 moves past the lowermost tip 38 of ports and allows fluid communication from the open bore area 39 in housing 2 through ports 10 and out through upper bore 40 into the casing string. Any time the differential pressure across valve ring 24 drops below the preset opening pressure, the valve ring expands to close ports 10. Referring now to FIG. 3, if at any time during or after the descent of the easing into the bore hole fluid it is desired to flow down the casing and into the bore hole and still retain the reverse circulation feature, this can be done at a relatively low flow rate as long as the flow rate used does not exceed that which is predetermined to shear pin 36 and convert to a check-valve type operation. This conversion flow rate can be preset at any desirable level; for instance, it is desirable in some circumstances to set this at three barrels per minute. Thus, downward flow can occur through the collar at any rate below three barrels per minute without shearing pin 36 and preventing any further reverse circulation.
When it is desirable to convert to check-valve type of operation (for instance, when cementing is to begin), this is achieved as shown in FIG. 4 by pumping down the casing at a rate in excess of the predetermined conversion rate, which excessive rate places sufficient downward shearing force on valve ring 24, which force is transmitted through washer 37 to housing 29 thereby shearing pin. 36 which passes through the housing. The downward force on pin 36 is resisted by upward force of spring 21 pushing upward on plunger 13, valve stem 14, threaded rod 15 and through lower bolt 28, thus shearing the shear pin 36 and releasing housing 29 from bolt 28.
The release of bolt 28 from housing 29 allows valve ring 24 to move out of opening 11 thereby fully opening ports 10 into open bore 39. Housing 29 drops down until shoulder 41 of the housing abuts shoulder 34 of the bolt, thereby preventing the housing from dropping off of the float collar and possibly interfering with any tools which may be located below the float collar.
After the valve ring 24 moves out of the opening 11 in response to hydraulic forces above it pushing it downward, the downward force on bolt 28 drops to a negligible amount allowing spring 21 to expand forcing plunger head 13 upward. Cement flowing through upper bore 40 is sufficient to maintain spring 21 compressed and plunger head 13 in an open valve position. When cement flow is stopped, spring 21 pushes plunger head 13 into valve seat 17, thereby closing the tool against reverse flow of cement. Hydrostatic pressure now being higher in the annulus than in the casing, cement will attempt to flow back into the casing through the valve but will act on the backside of plunger head 13 and in conjunction with lip 42 on the lower periphery of elastomeric covering 18 to form a tighter better seal of the valve assembly by forcing plunger head 13 tighter into seat 17 and by further acting upward against the back side of lip 42 forcing it into sealing arrangement with the lower part 43 of seat 17.
The advantages achieved by the use of this invention are partly a result of the ability of the valve ring 24 to compress sufficiently to allow the casing string to fill up as it enters the bore hole. Due to the limited ability of the valve ring to compress, a flow restrictive orifice is always present during back-flow between the valve ring and the lower end 23 of the lower valve body 4, thereby tending to prevent the casing from filling too quickly and overflowing at the surface.
Whereas the prior art devices utilize a resilient washer to limit back-flow, the present device utilizes a rather lengthy valve ring 24. The valve ring is advantageous over the washer due to the tendency of the washer to extrude out of position in high pressure hot wells and also due to the lateral movement of the valve stem which can occur within the rather loose-fitting valve guide.
The present invention also allows the casing to be filled at a controlled rate regardless of how high the pressure differential is between the bore hole and the casing bore, whereas if too high a pressure difierential occurs across the prior art devices, the casing string must be pulled upward in the hole or filled from the surface to reduce the pressure differential and allow further back-flowing.
The present invention allows the fluid to be forwardflowed or back-flowed as many times as desired as long as the conversion flow rate is not reached. As soon as the operator desires to convert to check-valve type operation (for instance, to begin cementing), this is easily and simply achieved from the surface without having to drop mechanical devices through the casing or run a stinger into the casing. The conversion is easily accomplished by increasing flow rates through the casing to above the present conversion flow rate.
All the parts of the present invention within the housing 2 can be made of easily drilled materials such as concrete, plastic, rubber, aluminum and brass, to allow the collar to be drilled out after the cementing operation has been completed and the cement set up. The drilling out leaves a full-open passage through the collar to pass other tools down the casing for further work, production or testing.
Although a specific preferred embodiment of the present invention has been described in the detailed description above, the description is not intended to limit the invention to the particular forms or embodiments disclosed herein, since they are to be recognized as illustrative rather than restrictive and it will be obvious to those skilled in the art that the invention is not so limited. For instance, it is contemplated that different numbers of vanes could be used between the valve guide and the lower body to vary the number and size of ports through the collar. It would also be possible to use other spring means to replace the sleeve portion of the valve ring and still maintain the differential fill feature. The invention is declared to cover all changes and modifications of the specific example of the invention herein disclosed for purposes of illustration, which do not constitute departures from the spirit and scope of the invention.
What is claimed is:
1. Valve apparatus for controlling flow and backflow of a fluid through a pipe string in a well during run-in and cementing operations, comprising:
a. tubular body means having a bore passage therethrough;
b. valve seat means within said tubular body;
0. first valve member means located movably within said body adapted to seat in said valve seat means in fluidically sealed engagement, and having a longitudinalaxial valve stem attached thereto;
d. valve guide means slidably enclosing a portion of said valve stem and allowing longitudinal movement of said valve stem therethrough, said valve guide means being connected to said tubular body;
e. spring means between said first valve member means and said valve guide means, said spring means arranged to bias said valve member means towards said valve seat means;
1'. means dividing the bore passage through said tubular body means into an upper chamber, a lower chamber and a lower bore passage, said upper chamber containing said first valve member means and said spring means;
g. port means through said dividing means communicating said upper chamber with said lower chamber;
h. resilient second valve member means located within said lower chamber and arranged to control fluid flow to and from said upper chamber through said port means and said lower chamber from said lower bore passage; said second valve member means further comprising a resilient elastomeric sleeve having an extended sleeve portion capable of being compressed into a shorter bulging member, and having one or more annular exterior shoulders capable of sealingly engaging the inner wall of said lower chamber and closing off said lower chamber to fluid flow therethrough; said sleeve providing an opening bias for said exterior shoulders;
i. means for holding said second valve member means in said lower chamber and holding said second valve means against movement to a full open position and for further preventing said first valve member means from seating in said valve seat means; and
j. frangible means between said holding means and said valve stem and arranged to selectively release said holding means thereby allowing said first valve means to move upward sufficiently enough to seat in said valve seat means, and simultaneously allowing said second valve means to move downward allowing full fluid communication between said upper chamber, said lower chamber, and said lower bore passage.
2. The apparatus of claim 1 wherein said resilient second valve member means further comprises a thin rigid retainer member adapted to transmit compressive forces to said elastorneric sleeve; and said elastomeric sleeve is further adapted to compress enough under a predetermined differential pressure to move said annular exterior shoulders a sufiicient distance to expose said port means to said lower bore passage.
3. The apparatus of claim 1. wherein said tubular body means further comprises a tough metallic outer housing, a drillable inner housing located concentrically and centrally within said outer housing and spaced a predetermined distance therefrom and a drillable composite material between said inner housing and said outer housing.
4. The apparatus of claim 3 wherein said outer housing is made of steel; said inner housing is comprised of an upper body removably connected to a lower body, both made of high strength drillable plastic; and said composite material comprises drillable concrete which was flowed in wet slurry form into the space between said inner housing and said outer housing and allowed to harden.
5. The-apparatus of claim 1 wherein said first valve members means comprises a plungerhead having a conical surface adapted to seat in said valve seat means in sealing engagement and said valve stem further comprises an upper stem and a lower stem assembly, said upper stem being connected to said plunger head and said lower stem assembly being fixedly attached by removable connector means to said upper stem, said lower stem assembly further comprising an inner rod member attached to said removable connector means and having an enlarged lower end defining an annular perpendicular shoulder, and a tubular case telescopically mounted over said rod member and attached thereto by said frangible means, said case having an inner annular shoulder projecting inward arranged to abut said annular perpendicular shoulder upon shearing of said frangible means.
6. The apparatus of claim wherein said first valve means further comprises an elastomeric cover located on said plunger head and adapted to contact said valve seat means and provide sealing engagement between said plunger head and said valve seat means, and said elastomeric cover further comprises an annular lip extending past said plunger head periphery and adapted to receive fluid back-flow and provide further sealing arrangements with said valve seat means.
7. The apparatus of claim 1 wherein said valve guide means is connected to said tubular body means by one or more vane members attached to said valve guide means and said tubular body means; said vane members serving to define said port means by their passage through the space between said valve guide means and said tubular body means.
8. The apparatus of claim 7 wherein said valve guide means further comprises a generally cylindrical collar arranged to encircle said valve stem in slidable relationship and having an upper portion extending above said vane members, said upper portion adapted to receive said spring means in abutting relationship.
Claims (8)
1. Valve apparatus for controlling flow and backflow of a fluid through a pipe string in a well during run-in and cementing operations, comprising: a. tubular body means having a bore passage therethrough; b. valve seat means within said tubular body; c. first valve member means located movably within said body adapted to seat in said valve seat means in fluidically sealed engagement, and having a longitudinal axial valve stem attached thereto; d. valve guide means slidably enclosing a portion of said valve stem and allowing longitudinal movement of said valve stem therethrough, said valve guide means being connected to said tubular body; e. spring means between said first valve member means and said valve guide means, said spring means arranged to bias said valve member means towards said valve seat means; f. means dividing the bore passage through said tubular body means into an upper chamber, a lower chamber and a lower bore passage, said upper chamber containing said first valve member means and said spring means; g. port means through said dividing means communicating said upper chamber with said lower chamber; h. resilient second valve member means located within said lower chamber and arranged to control fluid flow to and from said upper chamber through said port means and said lower chamber from said lower bore passage; said second valve member means further comprising a resilient elastomeric sleeve having an extended sleeve portion capable of being compressed into a shorter bulging member, and having one or more annular exterior shoulders capable of sealingly engaging the inner wall of said lower chamber and closing off said lower chamber to fluid flow therethrough; said sleeve providing an opening bias for said exterior shoulders; i. means for holding said second valve member means in said lower chamber and holding said second valve means against movement to a full open position and for further preventing said first valve member means from seating in said valve seat means; and j. frangible means between said holding means and said valve stem and arranged to selectively release said holding means thereby allowing said first valve means to move upward sufficiently enough to seat in said valve seat means, and simultaneously allowing said second valve means to move downward allowing full fluid communication between said upper chamber, said lower chamber, and said lower bore passage.
2. The apparatus of claim 1 wherein said resilient second valve member means further comprises a thin rigid retainer member adapted to transmit compressive forces to said elastomeric sleeve; and said elastomeric sleeve is further adapted to compress enough under a predetermined differential pressure to move said annular exterior shoulders a sufficient distance to expose said port means to said lower bore passage.
3. The apparatus of claim 1 wherein said tubular body means further comprises a tough metallic outer housing, a drillable inner housing located concentrically and centrally within said outer housing and spaced a predetermined distance therefrom and a drillable composite material between said inner housing and said outer housing.
4. The apparatus of claim 3 wherein said outer housing is made of steel; said inner housing is comprised of an upper body removably connected to a lower body, both made of high strength drillable plastic; and said composite material comprises drillable concrete which was flowed in wet slurry form into the space between said inner housing and said outer housing and allowed to harden.
5. The apparatus of claim 1 wherein said first valve members means comprises a plunger head having a conical surface adapted to seat in said valve seat means in sealing engagement and said valve stem further comprises an upper stem and a lower stem assembly, said upper stem being connected to said plunger head and said lower stem assembly being fixedly attached by removable connector means to said upper stem, said lower stem assembly further comprising an inner rod member attached to said removable connector means and having an enlarged lower end defining an annular perpendicular shoulder, and a tubular case telescopically mounted over said rod member and attached thereto by said frangible means, said case having an inner annular shoulder projecting inward arranged to abut said annular perpendicular shoulder upon shearing of said frangible means.
6. The apparatus of claim 5 wherein said first valve means further comprises an elastomeric cover located on said plunger head and adapted to contact said valve seat means and provide sealing engagement between said plunger head and said valve seat means, and said elastomeric cover further comprises an annular lip extending past said plunger head periphery and adapted to receive fluid back-flow and provide further sealing arrangements with said valve seat means.
7. The apparatus of claim 1 wherein said valve guide means is connected to said tubular body means by one or more vane members attached to said valve guide means and said tubular body means; said vane members serving to define said port means by their passage through the space between said valve guide means and said tubular body means.
8. The apparatus of claim 7 wherein said valve guide means further comprises a generally cylindrical collar arranged to encircle said valve stem in slidable relationship and having an upper portion extending above said vane members, said upper portion adapted to receive said spring means in abutting relationship.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24372672A | 1972-04-13 | 1972-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3776250A true US3776250A (en) | 1973-12-04 |
Family
ID=22919879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00243726A Expired - Lifetime US3776250A (en) | 1972-04-13 | 1972-04-13 | Float collar with differential fill feature |
Country Status (1)
Country | Link |
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US (1) | US3776250A (en) |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0076297A1 (en) * | 1981-04-17 | 1983-04-13 | Lászlo IMRE | Back-pressure valve in particular for pipelines, for ensuring the one-way flow of the streaming medium |
GB2159248A (en) * | 1984-05-23 | 1985-11-27 | Bossini Bortolo & Figli Srl | Non-return valve |
US4624316A (en) * | 1984-09-28 | 1986-11-25 | Halliburton Company | Super seal valve with mechanically retained seal |
WO1987003037A1 (en) * | 1985-11-08 | 1987-05-21 | Weatherford U.S. Inc. | Valve for use in well bores |
US4683955A (en) * | 1986-04-30 | 1987-08-04 | Halliburton Company | Automatic fill-up floating apparatus |
US4712619A (en) * | 1986-07-30 | 1987-12-15 | Halliburton Company | Poppet valve |
US5103853A (en) * | 1991-03-15 | 1992-04-14 | Mcgushion Kevin D | Safety shut off valve for gas cylinders |
US5411049A (en) * | 1994-03-18 | 1995-05-02 | Weatherford U.S., Inc. | Valve |
US5450903A (en) * | 1994-03-22 | 1995-09-19 | Weatherford/Lamb, Inc. | Fill valve |
US5647434A (en) * | 1996-03-21 | 1997-07-15 | Halliburton Company | Floating apparatus for well casing |
US5680902A (en) * | 1994-03-22 | 1997-10-28 | Weatherford/Lamb, Inc. | Wellbore valve |
US5836395A (en) * | 1994-08-01 | 1998-11-17 | Weatherford/Lamb, Inc. | Valve for wellbore use |
US5909771A (en) * | 1994-03-22 | 1999-06-08 | Weatherford/Lamb, Inc. | Wellbore valve |
US6244342B1 (en) * | 1999-09-01 | 2001-06-12 | Halliburton Energy Services, Inc. | Reverse-cementing method and apparatus |
EP1262629A1 (en) * | 2001-05-24 | 2002-12-04 | Halliburton Energy Services, Inc. | Slim hole stage cementer and method |
US6513598B2 (en) * | 2001-03-19 | 2003-02-04 | Halliburton Energy Services, Inc. | Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks |
WO2003048509A1 (en) * | 2001-11-28 | 2003-06-12 | Weatherford/Lamb, Inc. | Flow actuated valve for use in a wellbore |
EP1331356A2 (en) * | 2002-01-29 | 2003-07-30 | Halliburton Energy Services, Inc. | Backflow regulator downhole valve |
WO2003095790A1 (en) * | 2002-05-10 | 2003-11-20 | Weatherford/Lamb, Inc. | Valve assembly with locking sleeve for use in a wellbore |
US6820695B2 (en) | 2002-07-11 | 2004-11-23 | Halliburton Energy Services, Inc. | Snap-lock seal for seal valve assembly |
US20050274525A1 (en) * | 2004-06-15 | 2005-12-15 | Stevens Michael D | Floating plate back pressure valve assembly |
US20070034377A1 (en) * | 2005-07-22 | 2007-02-15 | Moyes Peter B | Downhole non-return valve and method |
US7234522B2 (en) | 2002-12-18 | 2007-06-26 | Halliburton Energy Services, Inc. | Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore |
US20070181188A1 (en) * | 2006-02-07 | 2007-08-09 | Alton Branch | Selectively activated float equipment |
WO2009038467A2 (en) | 2007-09-18 | 2009-03-26 | Petroleum Technology Company As | Shear open valve |
CN102628346A (en) * | 2012-05-09 | 2012-08-08 | 常熟市石油固井工具有限公司 | Self-filling type flow velocity-regulable float collar-float shoe device |
US20160053902A1 (en) * | 2014-08-25 | 2016-02-25 | Summit Energy Services, Inc. | Check valve |
US20160145982A1 (en) * | 2014-11-26 | 2016-05-26 | General Electric Company | Gas lift valve assemblies having fluid flow barrier and methods of assembling same |
CN105696968A (en) * | 2015-08-21 | 2016-06-22 | 刘书京 | Automatic grouting float collar and float shoe |
US20170082214A1 (en) * | 2015-09-21 | 2017-03-23 | Commonwealth Oilfield Products, Llc | Flow valve apparatus |
US9644450B2 (en) | 2015-01-26 | 2017-05-09 | Halliburton Energy Services, Inc. | Well flow control assemblies and associated methods |
WO2017112699A2 (en) | 2015-12-21 | 2017-06-29 | Baker Hughes Incorporated | Anti-chattering valve cone and methods for using same |
AU2014377739B2 (en) * | 2014-01-15 | 2017-09-07 | Halliburton Energy Services, Inc. | Method and apparatus for retaining weighted fluid in a tubular section |
US9765603B2 (en) | 2014-11-26 | 2017-09-19 | General Electric Company | Gas lift valve assemblies and methods of assembling same |
US11255152B2 (en) * | 2017-05-22 | 2022-02-22 | Hy-Tech Drilling Ltd | Drill hole inner tube plug |
EP4144954A1 (en) | 2021-09-07 | 2023-03-08 | Downhole Products Limited | Dual flow converted auto-fill float valve |
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Cited By (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0076297A1 (en) * | 1981-04-17 | 1983-04-13 | Lászlo IMRE | Back-pressure valve in particular for pipelines, for ensuring the one-way flow of the streaming medium |
EP0076297A4 (en) * | 1981-04-17 | 1983-08-09 | Laszlo Imre | Back-pressure valve in particular for pipelines, for ensuring the one-way flow of the streaming medium. |
GB2159248A (en) * | 1984-05-23 | 1985-11-27 | Bossini Bortolo & Figli Srl | Non-return valve |
US4624316A (en) * | 1984-09-28 | 1986-11-25 | Halliburton Company | Super seal valve with mechanically retained seal |
WO1987003037A1 (en) * | 1985-11-08 | 1987-05-21 | Weatherford U.S. Inc. | Valve for use in well bores |
US4683955A (en) * | 1986-04-30 | 1987-08-04 | Halliburton Company | Automatic fill-up floating apparatus |
US4712619A (en) * | 1986-07-30 | 1987-12-15 | Halliburton Company | Poppet valve |
US5103853A (en) * | 1991-03-15 | 1992-04-14 | Mcgushion Kevin D | Safety shut off valve for gas cylinders |
US5411049A (en) * | 1994-03-18 | 1995-05-02 | Weatherford U.S., Inc. | Valve |
US5690177A (en) * | 1994-03-22 | 1997-11-25 | Weatherford Lamb, Inc. | Fill valve |
US5680902A (en) * | 1994-03-22 | 1997-10-28 | Weatherford/Lamb, Inc. | Wellbore valve |
US5450903A (en) * | 1994-03-22 | 1995-09-19 | Weatherford/Lamb, Inc. | Fill valve |
US5909771A (en) * | 1994-03-22 | 1999-06-08 | Weatherford/Lamb, Inc. | Wellbore valve |
US5836395A (en) * | 1994-08-01 | 1998-11-17 | Weatherford/Lamb, Inc. | Valve for wellbore use |
US5647434A (en) * | 1996-03-21 | 1997-07-15 | Halliburton Company | Floating apparatus for well casing |
US6244342B1 (en) * | 1999-09-01 | 2001-06-12 | Halliburton Energy Services, Inc. | Reverse-cementing method and apparatus |
US6513598B2 (en) * | 2001-03-19 | 2003-02-04 | Halliburton Energy Services, Inc. | Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks |
US6725935B2 (en) | 2001-04-17 | 2004-04-27 | Halliburton Energy Services, Inc. | PDF valve |
US6651743B2 (en) | 2001-05-24 | 2003-11-25 | Halliburton Energy Services, Inc. | Slim hole stage cementer and method |
EP1262629A1 (en) * | 2001-05-24 | 2002-12-04 | Halliburton Energy Services, Inc. | Slim hole stage cementer and method |
WO2003048509A1 (en) * | 2001-11-28 | 2003-06-12 | Weatherford/Lamb, Inc. | Flow actuated valve for use in a wellbore |
US6622795B2 (en) | 2001-11-28 | 2003-09-23 | Weatherford/Lamb, Inc. | Flow actuated valve for use in a wellbore |
GB2399370A (en) * | 2001-11-28 | 2004-09-15 | Weatherford Lamb | Flow actuated valve for use in a wellbore |
GB2399370B (en) * | 2001-11-28 | 2006-04-05 | Weatherford Lamb | Flow actuated valve for use in a wellbore |
EP1331356A3 (en) * | 2002-01-29 | 2003-10-29 | Halliburton Energy Services, Inc. | Backflow regulator downhole valve |
EP1331356A2 (en) * | 2002-01-29 | 2003-07-30 | Halliburton Energy Services, Inc. | Backflow regulator downhole valve |
WO2003095790A1 (en) * | 2002-05-10 | 2003-11-20 | Weatherford/Lamb, Inc. | Valve assembly with locking sleeve for use in a wellbore |
US6820695B2 (en) | 2002-07-11 | 2004-11-23 | Halliburton Energy Services, Inc. | Snap-lock seal for seal valve assembly |
US7234522B2 (en) | 2002-12-18 | 2007-06-26 | Halliburton Energy Services, Inc. | Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore |
US7108068B2 (en) | 2004-06-15 | 2006-09-19 | Halliburton Energy Services, Inc. | Floating plate back pressure valve assembly |
US20050274525A1 (en) * | 2004-06-15 | 2005-12-15 | Stevens Michael D | Floating plate back pressure valve assembly |
US7814982B2 (en) * | 2005-07-22 | 2010-10-19 | Baker Hughes Incorporated | Downhole non-return valve and method |
US20070034377A1 (en) * | 2005-07-22 | 2007-02-15 | Moyes Peter B | Downhole non-return valve and method |
US7527104B2 (en) * | 2006-02-07 | 2009-05-05 | Halliburton Energy Services, Inc. | Selectively activated float equipment |
US20090166044A1 (en) * | 2006-02-07 | 2009-07-02 | Alton Branch | Selectively Activated Float Equipment |
US7644774B2 (en) | 2006-02-07 | 2010-01-12 | Halliburton Energy Services, Inc. | Selectively activated float equipment |
US20070181188A1 (en) * | 2006-02-07 | 2007-08-09 | Alton Branch | Selectively activated float equipment |
US8291981B2 (en) | 2007-09-18 | 2012-10-23 | Petroleum Technology Company As | Shear open valve |
WO2009038467A3 (en) * | 2007-09-18 | 2009-05-07 | Petroleum Technology Company A | Shear open valve |
WO2009038467A2 (en) | 2007-09-18 | 2009-03-26 | Petroleum Technology Company As | Shear open valve |
US20100288502A1 (en) * | 2007-09-18 | 2010-11-18 | Petroleum Technology Company As | Shear Open Valve |
CN102628346A (en) * | 2012-05-09 | 2012-08-08 | 常熟市石油固井工具有限公司 | Self-filling type flow velocity-regulable float collar-float shoe device |
US9835008B2 (en) | 2014-01-15 | 2017-12-05 | Halliburton Energy Services, Inc. | Method and apparatus for retaining weighted fluid in a tubular section |
AU2014377739B2 (en) * | 2014-01-15 | 2017-09-07 | Halliburton Energy Services, Inc. | Method and apparatus for retaining weighted fluid in a tubular section |
US20160053902A1 (en) * | 2014-08-25 | 2016-02-25 | Summit Energy Services, Inc. | Check valve |
US9765603B2 (en) | 2014-11-26 | 2017-09-19 | General Electric Company | Gas lift valve assemblies and methods of assembling same |
US20160145982A1 (en) * | 2014-11-26 | 2016-05-26 | General Electric Company | Gas lift valve assemblies having fluid flow barrier and methods of assembling same |
US9689241B2 (en) * | 2014-11-26 | 2017-06-27 | General Electric Company | Gas lift valve assemblies having fluid flow barrier and methods of assembling same |
US9644450B2 (en) | 2015-01-26 | 2017-05-09 | Halliburton Energy Services, Inc. | Well flow control assemblies and associated methods |
CN105696968A (en) * | 2015-08-21 | 2016-06-22 | 刘书京 | Automatic grouting float collar and float shoe |
US20170082214A1 (en) * | 2015-09-21 | 2017-03-23 | Commonwealth Oilfield Products, Llc | Flow valve apparatus |
WO2017112699A2 (en) | 2015-12-21 | 2017-06-29 | Baker Hughes Incorporated | Anti-chattering valve cone and methods for using same |
US11255152B2 (en) * | 2017-05-22 | 2022-02-22 | Hy-Tech Drilling Ltd | Drill hole inner tube plug |
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US20230069930A1 (en) * | 2021-09-07 | 2023-03-09 | Downhole Products Limited | Dual flow converted auto-fill float valve |
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