CN104747121A - Protective jacket for Christmas tree - Google Patents
Protective jacket for Christmas tree Download PDFInfo
- Publication number
- CN104747121A CN104747121A CN201310729350.7A CN201310729350A CN104747121A CN 104747121 A CN104747121 A CN 104747121A CN 201310729350 A CN201310729350 A CN 201310729350A CN 104747121 A CN104747121 A CN 104747121A
- Authority
- CN
- China
- Prior art keywords
- inserting tube
- flange
- housing
- protective sleeve
- casing head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
Abstract
The invention discloses a protective jacket for a Christmas tree used for separating an inner cavity of the Christmas tree from liquid in an oil pipe so as to protect the Christmas tree, and an upper flange and a lower flange which are communicated with the inner cavity and are dead against up and down are formed on the Christmas tree. The protective jacket is characterized by comprising a tubular shell and an insertion pipe, wherein the lower end of the shell and the upper flange formed on the Christmas tree are butted with each other, the insertion pipe is coaxially sleeved in the shell, the insertion pipe and the shell relatively move in a joint axial direction, the lower end of the insertion pipe is held in the shell when the insertion pipe moves to a preset first position corresponding to the shell, and the lower end of the insertion pipe is inserted into the oil pipe from the shell when the insertion pipe moves to the second position corresponding to the shell; a tubular seal sleeves the lower end of the insertion pipe, and the seal and the oil pipe are hermetically connected to separate the inner cavity of the Christmas tree from the liquid in the oil pipe when the lower end of the insertion pipe is inserted into the oil pipe. The protective jacket for the Christmas tree is very convenient to use, and the Christmas tree can be protected.
Description
Technical field
The present invention relates to oil extraction apparatus field, more particularly, relate to a kind of casing head protective sleeve.
Background technology
In field of petroleum exploitation, often need to carry out fracturing work, namely utilize ground high-pressure pump, be there is to oil reservoir squeezing by production tree the fracturing fluid of viscosity higher.When injecting of the fracturing fluid speed and exceeding the absorptive capacity of oil reservoir, then on the oil reservoir of shaft bottom, form very high pressure, when this pressure exceedes the fracture pressure of reservoir rock near shaft bottom, oil reservoir will be pressed off and be produced crack.At this moment, on and on to oil reservoir squeezing fracturing fluid, crack will be continued to oil reservoir interior expansion.Open configuration is in order to keep the crack pressed off, then clamp-on the load fluid with proppant (being generally quartz sand) to oil reservoir, after load fluid enters crack, crack can be made on the one hand to continue to extend forward, the crack pressed off can be supported on the other hand, make it be unlikely closed.Then inject displacement fluid again, the load fluid of pit shaft is all replaced and enters crack, with quartz sand, fracture support is got up.Finally, the high viscosity fracturing fluid of injection can be discharged outside pit shaft automatically in degraded, leaves the crack that one or more length does not wait in oil reservoir, makes to set up between oil reservoir and pit shaft a new fluid passage.After pressure break, oil gas well yield generally can increase substantially.
In petroleum industry, the rated operating pressure of production tree must be greater than this well maximally stressor layer, to ensure that production tree can normally work.But because required pressure stressor layer above Ground during formation fracture, and be greater than the rated operating pressure of production tree toward contact.When required pressure is greater than the rated operating pressure of production tree when the formation is fractured, just fracturing work can only be abandoned.
Summary of the invention
In order to solve the problem; the object of the present invention is to provide a kind of casing head protective sleeve; for by isolated for the liquid in the inner chamber of production tree and oil pipe; to protect described production tree; described production tree forms the upper flange just right up and down communicated with described inner chamber and lower flange, and described casing head protective sleeve comprises:
The housing of tubulose, described housing lower end is docked regularly mutually with the upper flange that described production tree is formed;
Be set in described housing coaxially, and the Inserting Tube of axial relative motion that can be common each other with described housing edge, when the relatively described housing motion of described Inserting Tube is to predetermined primary importance, the lower end of described Inserting Tube is contained in described housing, when the relatively described housing motion of described Inserting Tube is to the second place, the lower end of described Inserting Tube is inserted in described oil pipe from described housing;
Described Inserting Tube lower end is arranged with tubular sealing, and described sealing is used for when the lower end of described Inserting Tube is inserted in described oil pipe, forms the connection sealed, to make the liquid in the inner chamber of described production tree and oil pipe isolated with described oil pipe.
According to casing head protective sleeve of the present invention, also comprise piston assembly, described piston assembly is used for being in transmission connection with external fluid power system, relies on the relatively described housing of Inserting Tube described in the power drive of described fluid power system up and down.
According in casing head protective sleeve of the present invention; Packed oil storage space is formed between described housing and described Inserting Tube; described piston assembly comprises piston, offer upper inlet on the housing and lower inlet; described piston is set in the middle part of described Inserting Tube regularly; described oil storage space is divided into upper reserve and lower reserve by described piston; described upper inlet is connected with described upper reserve, and described lower inlet is connected with described lower reserve.
According in casing head protective sleeve of the present invention, described piston and described Inserting Tube are coordinated by screw thread and are fixedly connected with.
According to casing head protective sleeve of the present invention, also comprise spigot nut, described Inserting Tube lower end is provided with the external screw thread matched with described spigot nut, the lower end of described sealing by clamping between described spigot nut and described Inserting Tube lower end.
According to casing head protective sleeve of the present invention, also comprise conduit, the lower end of described conduit and the threaded upper ends of described Inserting Tube is connected and fixed or described conduit and described Inserting Tube one-body molded.
According in casing head protective sleeve of the present invention, expanding rear formation first flange socket in upper end of described conduit, for the fracturing unit that Flange joint is external.
According in casing head protective sleeve of the present invention, flange is locked in the expanding rear formation in lower end of described conduit, locks flange under the expanding rear formation in described housing upper end, described upper locking flange and described lower locking flange are fixed by Flange joint.
According in casing head protective sleeve of the present invention, expanding rear formation second flange socket in described housing lower end, described second flange socket Flange joint is in described upper flange, fixing to make described housing lower end dock with the upper flange of described production tree.
According in casing head protective sleeve of the present invention; described housing comprises: comprise the first pipeline section of described housing upper end, the second middle pipeline section and comprise the 3rd pipeline section of described housing lower end, and the two ends of described second pipeline section respectively fixed cover are located at described first pipeline section lower end and the 3rd pipeline section upper end.
Implementing casing head protective sleeve of the present invention when carrying out fracturing work, fracturing fluid and production tree to be kept apart, can production tree be protected, and use is extremely convenient.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of first embodiment of the invention casing head protective sleeve when the relative housing of Inserting Tube is in primary importance.
Fig. 2 is that the casing head protective sleeve of second embodiment of the invention is when being in the first operating mode and the connection diagram of production tree.
Fig. 3 is that the casing head protective sleeve of second embodiment of the invention is when being in the second operating mode and the connection diagram of production tree.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that instantiation described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, in oil extraction field, usually use the end link of production tree 5 pairs of oil extractions to control.In Fig. 1, production tree 5 comprises inner chamber (non-label), and production tree 5 offers the upper flange 51 and lower flange 52 that communicate with inner chamber, upper flange 51 lower flange about 52 is facing each other.Upper flange 51 is generally closed when recovering the oil, the external fracturing unit when fracturing work.Existing oil pipe 6 docks with lower flange 52, for being drawn from down-hole by crude oil, or injects fracturing fluid from oil pipe 6 to down-hole.
Refer to Fig. 1, Fig. 1 is the structural representation of first embodiment of the invention casing head protective sleeve when Inserting Tube is in primary importance.As shown in Figure 1, casing head protective sleeve comprises housing 1 and the Inserting Tube 2 of integrated tubulose.Inserting Tube 2 is set in housing 1 coaxially, and can with housing 1 along axial relative motion common each other.Expanding rear formation second flange socket 11 in lower end of housing 1, locks flange 12 under the expanding rear formation in upper end of housing 1, the second flange socket 11 and lower locking flange 12 offers respectively for bolted multiple screwed hole 110 and multiple screwed hole 120.
Form the tubular oil storage space (non-label) of sealing between housing 1 and Inserting Tube 2, oil storage space is divided into upper reserve 31 and lower reserve 32 by piston 33.The upper inlet 34 communicated with upper reserve 31 is offered in the upper end of housing 1, offer the lower inlet 35 communicated with oil storage space 32 in the lower end of housing 1, upper inlet 34 and lower inlet 35 can be used for allowing external fluid power system respectively to upper reserve 31 and lower reserve 32 injection liquid force feed or outwards releasing hydraulic oil from upper reserve 31 and lower reserve 32.
The lower end fixed cover of Inserting Tube 2 is provided with sealing 21, and seal 21 fixed sleeves and be provided with spigot nut 22, spigot nut 22 is connected by screw threads for fastening with the lower end of Inserting Tube 2, sealing 21 by clamping between spigot nut 22 and Inserting Tube 2.
In the present embodiment, piston 33 is set on housing 1 regularly by screwed connection.Piston 33, upper inlet 34 and lower inlet 35 form piston assembly (non-label), and external fluid power system (not shown) is by driven plunger assembly, thus housing 1 is up and down relatively to drive Inserting Tube 2.When the hydraulic pump forward pump oil of fluid power system, upper reserve 31 is through upper inlet 34 injection liquid force feed, and lower reserve 32 releases hydraulic oil in lower inlet 35, and at this moment the pressure differential on both sides makes piston 33 drive Inserting Tube 2 to move downward up and down.
Casing head protective sleeve also comprises conduit 4; flange 41 is locked in the expanding rear formation in lower end of conduit 4; expanding rear formation first flange socket 42 in upper end of conduit 4, upper locking flange 41 and the first flange socket 42 offer respectively for bolted multiple screwed hole 410,420.The lower end of conduit 4 and the upper end of Inserting Tube 2 are fastenedly connected by threaded engagement, and upper locking flange 41 and lower locking flange 12 are equipped with screw bolt and nut by screwed hole 410,120 and fix locking simultaneously.Conduit 4 upper end docking fracturing unit after, by the first flange socket 42 arrange screwed hole 420 and be equipped with screw bolt and nut thus be fastenedly connected with fracturing unit.
Refer to Fig. 2, Fig. 2 is that the casing head protective sleeve of the second embodiment of the present invention is when being in the first operating mode and the connection diagram of production tree.
Different from the integrated housing 1 in embodiment one, the housing 1 in the present embodiment is divided into the first pipeline section 1A, the second pipeline section 1B and the 3rd pipeline section 1C.Wherein, lower locking flange the 12, three pipeline section 1C that the first pipeline section 1A comprises the expanding rear formation in housing 1 upper end comprises the second flange socket 11 of the expanding rear formation in housing 1 lower end.One end 13 of second pipeline section 1B and the other end 14 respectively fixed cover are located at the lower end of the first pipeline section 1A and the upper end of the 3rd pipeline section 1C, it is fixedly connected with mode and is preferably threaded, its be fixedly connected with mode can also be weld, be threaded, interference fit connects or other known fixed forms.Be threaded by the above-mentioned of each several part of housing 1, housing 1 can manufacture with Inserting Tube 2 and piston assembly easily and assemble.
Casing head protective sleeve is connected with upper flange 51 bolton on the upper flange 51 of production tree by the screwed hole 110 that the second flange socket 11 is offered, thus is arranged on production tree 5.Now, Inserting Tube 2 is in primary importance relative to housing 1, is extreme higher position in the drawings.
Under the first operating mode, the lower end of Inserting Tube 2 is included in housing 1.The inner chamber of production tree and the intracavity inter-connection of oil pipe.Now casing head protective sleeve does not affect other normal operations except pressure break, as oil producing operation, easy to operate.
Refer to Fig. 3, Fig. 3 is that the casing head protective sleeve of the second embodiment of the present invention is when being in the second operating mode and the connection diagram of production tree.In conjunction with consulting Fig. 2; by casing head protective sleeve and production tree 5 as Fig. 2 installs be connected after; make the hydraulic pump forward pump oil of external fluid power system; upper reserve 31 is through upper inlet 34 injection liquid force feed; lower reserve 32 releases hydraulic oil in lower inlet 35, and at this moment the pressure differential on both sides makes piston 33 drive Inserting Tube 2 to move downward from extreme higher position up and down.When housing 1 moves downward extreme lower position as shown in Figure 3, close hydraulic pump, enter the second operating mode shown in Fig. 3.
Now, the lower end of Inserting Tube 2 is inserted in oil pipe 6, and the sealing 21 that the lower end of Inserting Tube 2 is assembled makes the lower end of Inserting Tube 2 and oil pipe 6 form the connection sealed, thus the inner chamber of the inner chamber of oil pipe 6 and production tree 5 is isolated.
Lock after lower locking flange 12 bolt now formed in the upper locking flange 41 of expanding for the lower end of conduit 4 rear formation and the upper end of housing 1 by bolt is connected, because the upper end of Inserting Tube 2 is connected by screw threads for fastening with the lower end of 4, the relative housing 1 of Inserting Tube 2 is stoped to move upward.
Under the second operating mode, because the inner chamber of oil pipe 6 and the inner chamber of production tree 5 are isolated, fracturing fluid can enter oil pipe 6 through the inner chamber of the inner chamber of 4, Inserting Tube 2 from external fracturing unit successively, but the inner chamber of production tree 6 can not be entered into, now carry out fracturing work, then can not produce destructive pressure to production tree 5.
When turning to the first operating mode from the second operating mode, only need make hydraulic pump reversing pump oil, upper reserve 31 releases hydraulic oil through upper inlet 34, lower reserve 32 is injection liquid force feed in lower inlet 35, at this moment the pressure differential on both sides makes piston 33 drive Inserting Tube 2 to move upward up and down, when Inserting Tube 2 rises to primary importance and extreme higher position, in Inserting Tube 2 lower end retraction housing 1, namely change the first operating mode into.If do not use casing head protective sleeve for a long time, it can also be unloaded easily.
It will be appreciated by persons skilled in the art that each flange of the present invention is when Flange joint, the screwed hole position on the flange be connected and size one_to_one corresponding, and match with the bolt of this flange fastening, nut.In addition, the junction of each flange of the casing head protective sleeve in the present invention can be carried out sealing extraly and be strengthened, and carries out sealing strengthen as used the known seal means such as seal washer.
In the present invention, the first operating mode of indication can be oil producing operation, can also be the normal operations such as gas production operation natch; In the present invention, the second operating mode of indication can be fracturing work, can also be the upkeep operation such as workover treatment or kill job natch.
Only be described in detail with the using method of the casing head protective sleeve of the second embodiment to casing head protective sleeve of the present invention below.The using method of casing head protective sleeve of the present invention comprises step:
A) sealing 21 is arranged on Inserting Tube 2, then tightens spigot nut 22, and smear lubricating grease on spigot nut 22 and sealing 21;
B) on upper flange 51, place gasket ring, whole device is vertically sling, make the second flange socket 11 of casing head protective sleeve align rear bolt with upper flange 51 and tighten;
C) with hydraulic line, upper inlet 34, lower inlet 35 are connected with the outlet line interface of the reversal valve on the hydraulically controlled station of external fluid power system;
D) hydraulically controlled station reversal valve handle is operated, make inlet 34 on casing head protective sleeve enter hydraulic oil, promote piston assembly and Inserting Tube 2 descending, make Inserting Tube 2 and sealing 21 enter into oil pipe 6 inner chamber, upper locking flange 41 is descending with Inserting Tube 2 simultaneously, falls on lower locking flange 12;
E) with bolton being locked flange 41 and lower locking flange 12;
F) recycle other connector as the ninth of the ten Heavenly Stems joint, plug valve, high pressure elbow and pipeline etc., the first flange socket 42 is connected with fracture manifold and just can carry out construction operation, as fracturing work.
In addition, operate according to the carrying out that above step is contrary after construction operation completes, just can realize extracting Inserting Tube 2 in oil pipe 6, and production tree pressure break protective sleeve is unloaded easily from production tree 5.
If when needing the pressure break bulb diameter dropped in oil pipe to be greater than the internal diameter of Inserting Tube 2 during pressure break next section, will when after pressing crack construction termination of pumping, in oil pipe, pressure drops to the rated operating pressure being less than production tree 5, removable upper locking flange 41, lower locking flange 12, pull hydraulically controlled station reversal valve handle, make piston 33 and Inserting Tube 2 up, by the storage of the lower end of Inserting Tube 2 in housing 1, then proceed fracturing operation from the mode of the flutter valve pitching of production tree 5.
Casing head protective sleeve of the present invention can be switched easily by fluid power system between the first operating mode and the second operating mode; and can after carrying out construction operation; need not casing head protective sleeve be dismantled, after only Inserting Tube 2 being risen to primary importance, just can carry out other normal operations such as oil recovery.Even if when not using for a long time, also very convenient during dismounting.
Claims (10)
1. a casing head protective sleeve; for by isolated for the liquid in the inner chamber of production tree (5) and oil pipe (6); to protect described production tree (5); described production tree (5) above forms the upper flange (51) just right up and down and lower flange (52) that communicate with described inner chamber; it is characterized in that, described casing head protective sleeve comprises:
The housing (1) of tubulose, described housing (1) lower end is docked regularly mutually with the upper upper flange (51) formed of described production tree (5);
Be set in described housing (1) coaxially, and the Inserting Tube (2) of axial relative motion that can be common each other with described housing (1) edge, when the relatively described housing (1) of described Inserting Tube (2) moves to predetermined primary importance, the lower end of described Inserting Tube (2) is contained in described housing (1), when the relatively described housing (1) of described Inserting Tube (2) moves to the second place, the lower end of described Inserting Tube (2) is inserted in described oil pipe (6) from described housing (1);
Described Inserting Tube (2) lower end is arranged with tubular sealing (21), described sealing (21) is for when the lower end of described Inserting Tube (2) is inserted in described oil pipe (6), the connection sealed is formed, to make the liquid in the inner chamber of described production tree (5) and oil pipe (6) isolated with described oil pipe (6).
2. casing head protective sleeve according to claim 1; it is characterized in that; also comprise piston assembly, described piston assembly is used for being in transmission connection with external fluid power system, relies on the relatively described housing of Inserting Tube (2) (1) described in the power drive of described fluid power system up and down.
3. casing head protective sleeve according to claim 2, it is characterized in that, Packed oil storage space is formed between described housing (1) and described Inserting Tube (2), described piston assembly comprises piston (33), be opened in the upper inlet (34) on described housing (1) and lower inlet (35), described piston (33) is set in described Inserting Tube (2) middle part regularly, described oil storage space is divided into upper reserve (31) and lower reserve (32) by described piston (33), described upper inlet (34) is connected with described upper reserve (31), described lower inlet (35) is connected with described lower reserve (32).
4. casing head protective sleeve according to claim 3, is characterized in that, described piston (33) and described Inserting Tube (2) are coordinated by screw thread and be fixedly connected with.
5. casing head protective sleeve according to claim 1; it is characterized in that; also comprise spigot nut (22); described Inserting Tube (2) lower end is provided with the external screw thread matched with described spigot nut (22), the lower end of described sealing (21) by clamping between described spigot nut (22) and described Inserting Tube (2) lower end.
6. casing head protective sleeve according to claim 1, is characterized in that, also comprises conduit (4), the lower end of described conduit (4) and the threaded upper ends of described Inserting Tube (2) is connected and fixed or described conduit (4) and described Inserting Tube (2) are one-body molded.
7. casing head protective sleeve according to claim 6, is characterized in that, expanding rear formation first flange socket (42) in upper end of described conduit, for the fracturing unit that Flange joint is external.
8. casing head protective sleeve according to claim 7; it is characterized in that; flange (41) is locked in the expanding rear formation in lower end of described conduit (4); lock flange (12) under the expanding rear formation in described housing (1) upper end, described upper locking flange (41) and described lower locking flange (12) are fixed by Flange joint.
9. casing head protective sleeve according to claim 1; it is characterized in that; expanding rear formation second flange socket (11) in described housing (1) lower end; described second flange socket (11) Flange joint is in described upper flange (51), fixing to make described housing (1) lower end dock with the upper flange (51) of described production tree (6).
10. casing head protective sleeve according to any one of claim 1 to 9; it is characterized in that; described housing (1) comprising: comprise first pipeline section (1A) of described housing (1) upper end, middle the second pipeline section (1B) and comprise the 3rd pipeline section (1C) of described housing (1) lower end; the two ends (13,14) of described second pipeline section (1B) respectively fixed cover are located at described first pipeline section (1A) lower end and the 3rd pipeline section (1C) upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310729350.7A CN104747121B (en) | 2013-12-25 | 2013-12-25 | Casing head protective sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310729350.7A CN104747121B (en) | 2013-12-25 | 2013-12-25 | Casing head protective sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104747121A true CN104747121A (en) | 2015-07-01 |
| CN104747121B CN104747121B (en) | 2017-07-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310729350.7A Active CN104747121B (en) | 2013-12-25 | 2013-12-25 | Casing head protective sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104747121B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412372A (en) * | 2020-12-11 | 2021-02-26 | 重庆前卫科技集团有限公司 | Recovery tool is sent into to production tree abrasionproof cover under water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6186239B1 (en) * | 1998-05-13 | 2001-02-13 | Abb Vetco Gray Inc. | Casing annulus remediation system |
| CN101748983A (en) * | 2008-12-12 | 2010-06-23 | 中国石油大学(北京) | Protector for oil pipe working under pressure used for oil well |
| CN202157777U (en) * | 2011-07-08 | 2012-03-07 | 中国石油天然气股份有限公司 | Well head protector of hydraulic base seal |
| CN202249899U (en) * | 2011-09-22 | 2012-05-30 | 中国石化集团江汉石油管理局井下测试公司 | Pressure isolating device for wellhead production tree |
| CN203022675U (en) * | 2012-12-21 | 2013-06-26 | 东营鑫华莲石油机械有限公司 | Thermal recovery well mouth protecting device |
| CN103443392A (en) * | 2011-01-11 | 2013-12-11 | 阿克海底公司 | Bore protector |
-
2013
- 2013-12-25 CN CN201310729350.7A patent/CN104747121B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6186239B1 (en) * | 1998-05-13 | 2001-02-13 | Abb Vetco Gray Inc. | Casing annulus remediation system |
| CN101748983A (en) * | 2008-12-12 | 2010-06-23 | 中国石油大学(北京) | Protector for oil pipe working under pressure used for oil well |
| CN103443392A (en) * | 2011-01-11 | 2013-12-11 | 阿克海底公司 | Bore protector |
| CN202157777U (en) * | 2011-07-08 | 2012-03-07 | 中国石油天然气股份有限公司 | Well head protector of hydraulic base seal |
| CN202249899U (en) * | 2011-09-22 | 2012-05-30 | 中国石化集团江汉石油管理局井下测试公司 | Pressure isolating device for wellhead production tree |
| CN203022675U (en) * | 2012-12-21 | 2013-06-26 | 东营鑫华莲石油机械有限公司 | Thermal recovery well mouth protecting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412372A (en) * | 2020-12-11 | 2021-02-26 | 重庆前卫科技集团有限公司 | Recovery tool is sent into to production tree abrasionproof cover under water |
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| Publication number | Publication date |
|---|---|
| CN104747121B (en) | 2017-07-07 |
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