US3758731A - Switch means for actuating downhole devices - Google Patents
Switch means for actuating downhole devices Download PDFInfo
- Publication number
- US3758731A US3758731A US00116948A US3758731DA US3758731A US 3758731 A US3758731 A US 3758731A US 00116948 A US00116948 A US 00116948A US 3758731D A US3758731D A US 3758731DA US 3758731 A US3758731 A US 3758731A
- Authority
- US
- United States
- Prior art keywords
- rack
- switch
- lever
- ratchet
- actuator member
- 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.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 17
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/34—Driving mechanisms, i.e. for transmitting driving force to the contacts using ratchet
-
- 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
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/1185—Ignition systems
- E21B43/11855—Ignition systems mechanically actuated, e.g. by movement of a wireline or a drop-bar
Definitions
- F/GENT SWITCH MEANS FOR ACTUATING DOWNHOLE DEVICES BACKGROUND OF THE DISCLOSURE There are many different downhole tools which are lowered into a borehole and subsequently actuated by a source of electrical current at a prescribed depth. Examples are perforating tools, packers, and downhole recorder devices.
- the present invention encompases an electrically actuated downhole tool combination wherein an electrical power supply and a switch means therefore are included in the tool string, with the tool string being supported by a slick line, and with the switch means being actuated in response to a reciprocal motion of the slick line.
- a primary object of this invention is to pro vide a power package for actuating downhole tools in response to relative movement between the power package and the borehole.
- Another object of this invention is to provide a downhole tool, having circuitry including a switch means, which is actuated upon reciprocation of the tool.
- a still further object of this invention is the provision of a switch mechanism having a rack actuated by reciprocal motion of the apparatus and further including a ratchet which enables the rack to be reset at any time before closure of the switch.
- Another object of this invention is the provision of an improved downhole switch means which is selectively actuated by manipulation of its support means.
- FIG. 1 is a fragmentary, part cross-sectional, side view of a borehole formed within a portion of the earth, with the tool of the present invention being schemati' cally illustrated therein;
- FIG. 2 is an enlarged, fragmentary longitudinal crosssectional view of the present invention
- FIG. 3 is a cross-sectional view taken along line 33 of FIG. 2;
- FIG. 4A is a cross-sectional view taken along line 4A4A of FIG. 2;
- FIG. 4B is a cross-sectional view taken along line 48-48 of FIG. 4A;
- FIGS. 5 and 6, respectively, are cross-sectional views taken along lines 5-5 and 6-6, respectively, of FIG. 2;
- FIG. 7 is an enlarged, disasembled, perspective view of part of the apparatus disclosed in the foregoing figures;
- FIG. 8 is afragmentary, part-cross-sectional view of part of the apparatus disclosed in the foregoing figures.
- FIGS. 9, l0, and 11, respectively, set forth the details of amodification of the apparatus of FIG. 7;
- FIG. 12 is a schematical diagram of one electrical circuitry which can be used in conjunction with the present invention.
- FIG. 1 Illustrated in FIG. 1 is a borehole 10 which has been formed in the ground 11 in order to gain access to a hydrocarbon bearing formation 12.
- Cement l3 surrounds at least a marginal portion of casing 14.
- a slick line 15 is adapted to support the elongated hollow body 16 which is suspended within the casing of the borehole.
- a swivel 17 is usually employed for connecting the slick line to the tool string.
- the tool string includes a jet perforating gun 18 which is connected to the tool or switch assembly of the instant invention by the illustrated sub 19.
- a bull plug 20 forms the lower depending end of the tool.
- the switch assembly is housed within an elongated hollow body, preferably round in cross-sectional area, and includes a polished portion 21 which is limited in longitudinal length by the illustrated spaced apart stop members 22 and 23.
- An actuator member 24 is circumferentiallydisposed and slidably captured about the polished section. Relative movement between the tool and the boreholereciprocates the actuator between the two stop members.
- a level 25and a similar lower lever member 26 are seen protruding outwardly from the polished portion of the body.
- the actuator member includes spaced apart rings 27, 28 which are connected together by the elongated resilient bows 29 with the marginal terminal ends of the bows being affixed to each of the spaced apart ring members.
- the inside peripheral wall surface 30 is enlarged at the illustrated threaded area so as to threadedly receive insulated bulk-head 31 therein.
- the bulkhead forms a part of the power section, within which there is included a source of stored electrical power in the form of a storage battery 32.
- Spring 33 engages a limited portion of the interior side walls of the body and urges the battery into its illustrated position.
- Conductors 34 lead from the series connected battery and switch means 35.
- the switch means is comprised of spaced apart copper conductors 35 having insulation therebetween with the insulation also forming the before mentioned bulkhead 31 for hermetically sealing the battery compartment from the remainder of the tool string. Electrodes 235 form a current flow path to and from the switch means.
- the upper chamber 30 enlarges into chamber 36, and provides a shoulder therebetween against which bulkhead 37 is retained by means of snap ring 38.
- - Inspection port 39 enables the position of the rack 40 to be visually observed.
- the rack 40 includes an upper constant diameter portion which is reciprocatingly received within bulkhead 37, and further includes a multiplicity of longitudinally spaced apart circumferentially extending teeth having a circumferentially disposed horizontal surface 42 formed by a frusto conical portion 43, and an opposite marginal end portion 44 which terminates as a free end at 45.
- Keeper 46 is pinned to the free end portion so as to maintain biasing means 47 compressed between bulkhead 48 and the keeper.
- the last named bulkhead is maintained in anchored relationship with respect to the wall of the body by the radially spaced apart screws 49.
- Aperture 50 provides a passageway for linkage 51.
- the linkage is attached to a lower lever member 52.
- the lever member is pivotally attached to the body at 53, and has a marginal end portion depending through longitudinal slot 54.
- the remaining end portion of the linkage is affixed to aperture 51' of ratchet assembly 55.
- the ratchet is biased into the illustrated position by a leaf spring 56, with the leaf spring having a marginal portion thereof attached to the inside peripheral wall of the body by fastener means 56'.
- Spaced apart mounts 57 maintain the ratchet in the illustrated position of FIG. 2 and 8.
- Lever 25 further includes a body portion 59 which is milled in a manner to form chamber 60 for receiving the illustrated articulated member 61 therein.
- Aperture 62 receives an end portion of spring 66 thereon so as to bias the lever against stop member 124.
- FIGS. 9-1 1 set forth a modification of the lever seen in FIG. 2, and includes an elongated member 159 having stop member 67 in the form of a laterally arranged pin, and a hinge which is received through aperture 165'.
- Base plate 168 supports the hinge and the stop means, with slot 166 receiving member 159 therethrough in a manner which allows the member 161 to pivot about a journal formed at 165.
- FIG. 12 shows a time delay circuitry for use in conjunction with the apparatus of the present invention, wherein storage battery 32 has one electrical terminal thereof electrically connected to heating element H and to one electrical contact of switch S.
- the heater is series connected with respect to the before mentioned switch 35, with the remaining electrical terminal of the switch being connected to the remaining battery post.
- the two illustrated leads at 34 are adapted to be connected to provide asource of current to an electrically actuated tool, such as the previously discussed jet perforating gun seen at 18, for example.
- the switch means 16 is attached into a tool string which includes an electrically actuated tool, such as the jet perforating gun 18.
- an electrically actuated tool such as the jet perforating gun 18.
- the tool 18 could be situated in underlying relationship with respect to the instant invention, or for that matter, the entire tool of FIG. 2 could be inverted so as to enable the relationship of the tool-string seen in FIG. 1 to be tu'med from the illustration.
- the toll is run into the hole on the slick line, and generally positioned relative to the production formation by using a depthometer which measures the length which the slick line has been run downhole.
- the cable drum When it is desired to perforate the casing, the cable drum is actuated in a manner to impart reciprocalmotion into the slick line, which in turn causes the actuator member to reciprocate with respect to the body an amount indicated by 1 in FIG. 1.
- Each reciprocation of the body causes the actuator member to pivot lever 25 an amount which lifts the rack in an upward direction a distance equal to the spacing between two adjacent teeth 42.
- the ratchet continues to successively engage each of the teeth as the lever is pivotally moved in response to the action of the slick line. After making the required number of strokes to move the bridge member into electrical contact with the electrodes of the switch means, the operator has 30 seconds in which to make final vertical adjustments of the tool string so as to perforate the casing at the exact required length.
- the distance between bulkhead 37 and 31, as well as the length L1 and L2, or the length of the rack 40, can be different from that disclosed in the drawings. It is usually desirable to have at least 12 teeth on the rack so as to require one dozen strokes in order to actuate the device. It is quite obvious when the gun tires for the reason that it is felt at the well head.
- mounting plate 168 is attached to the inside peripheral wall of the body so as to dispose the free end of member 161 in proper alignment so as to permit engagement with the teeth of the rack.
- pin 67 engages finger 161, thereby lifting one tooth of the rack past the ratchet so as to enable the ratchet to engage and hold the rack while the lever 25 is again cycled so as to lift the rack another increment equal to the distance between adjacent teeth.
- a switch assembly for providing a source of current to the tool, comprising:
- actuator member said actuator member being slidably received on the exterior of said hollow body and adapted to reciprocate between said stop members; said actuator member having borehole wall engaging means affixed thereto for causing said actuator member to be reciprocated between said stop means in response to relative movement between said body and a borehole wall;
- a rack means by which said rack is slidably joumaled within said hollow body and movable from a first to a second position;
- means including a lever positioned to be engaged and moved by said actuator member, to successively engage and move said rack towards said second position when said lever is engaged and moved by said actuator member;
- means including a lower lever member connected for movement by said actuator member-for disengaging said ratchet from said rack so that said actuator member, when moved against said lower lever member, causes said ratchet to be released from said rack thereby enabling said rack to return to the first position;
- a source of electrical power a switch arranged to be actuated into a current flowing position, circuit means connecting said switch to said source of power and adapted to energize an electrically actuated downhole tool upon said switch being actuated;
- said means connected to said rack for actuating said switch means including a metallic plate member connected to a depending end of said rack; means insulating said plate member from said rack, said plate member adapted to form a current flow path across said spaced apart contacts when said rack is moved to said second position.
- ratchet is in the form of an arm, means by which said arm is pivotally mounted to said body, means by which said am is normally biased into a rack engaging position;
- said lower lever member being disposed between one said stop member and said lever means; linkage connecting said lower lever member to said ratchet for moving said ratchet when said actuator engages said lower member, to thereby cause said ratchet to release said rack.
- said actuator includes spaced apart ring members circumferentially disposed about said body and further including bow members radially spaced apart from one another and connected to said ring members, with one depending end of each bow being connected to one ring member; said bow having an outwardly disposed marginal portion thereof for engaging the borehole wall.
- said circuit means includes a heating element, a bimetal switch having normally open contacts thereon, where said bimetal switch is moved to the closed position when said heating element is electrically energized;
- said power source having two electrical conductors with one conductor being connected to one contact of said bimetal switch and to said heating element;
- said heating element and the first recited switch being series connected with the remaining terminal of the last said switch being connected to the remaining terminal of said power source;
- said means connected to said rack for actuating said switch means including a metallic plate member connected to a depending end of said rack; means insulating said plate member from said rack, said plate member adapted to form a current flow path across said spaced apart contacts when said rack is moved to said second position.
- circuit means includes a nonnally open switch for connecting said power source to a downhole tool; a time delay means for moving said normally open switch to the closed position upon the first switch being moved to the closed position.
- Apparatus for electrically actuating downhole tools said apparatus including a housing in the form of an elongated hollow body;
- actuator member said actuator member being slidably received on the exterior of said hollow body and adapted to reciprocate between said stop members; said actuator member having borehole wall engaging means affixed thereto for causing said actuator member to be reciprocated between said stop members in response to relative movement between said body and a borehole wall;
- a rack a lever, a ratchet; said rack being slidably received within said hollow body and movable between a first and second position;
- said lever positioned to successively engage and move said rack towards said second position
- said actuator member being arranged relative to said lever so as to engage and move said lever to thereby cause the before recited movement of said rack;
- said ratchet positioned to releasably engage and hold said rack against movement towards said first position
- a source of electrical power a switch arranged to be actuated into a current flowing position, circuit means connecting said switch means to said source of power and adapted to energize an electrically actuated downhole tool upon said switch being actuated;
- said ratchet is in the form of an arm, means by which said arm is pivotally mounted to said body, means by which said arm is normally biased into a rack engaging position;
- a lower lever member being disposed between one said stop member and said lever; linkage connecting said lower lever member to said ratchet for moving said ratchet when said actuator engages said lower member, to thereby cause said ratchet to release said rack.
- circuit means includes a heating element, a bimetal switch having normally open contacts thereon, where said bimetal switch is moved to the closed position when said heating element is electrically energized;
- said power source having two electrical conductors with one conductor being connected to one contact of said bimetal switch and to said heating element;
- heating element and the first recited switch being series connected with the remaining terminal of the bi-mettalic switch being connected to the remaining terminal of said power source;
- said rack has a marginal longitudinally extending portion thereof formed into spaced apart circumferentially extending teeth, each of said teeth adapted to be individually engaged by a portion of said ratchet and a portion of said lever so that lever can engage one of said teeth and move said rack towards said second position while said ratchet engages another of said teeth and holds said rack while said lever is being actuated by said actuator member.
Abstract
Description
Claims (12)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11694871A | 1971-02-19 | 1971-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3758731A true US3758731A (en) | 1973-09-11 |
Family
ID=22370208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00116948A Expired - Lifetime US3758731A (en) | 1971-02-19 | 1971-02-19 | Switch means for actuating downhole devices |
Country Status (1)
Country | Link |
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US (1) | US3758731A (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4616702A (en) * | 1984-05-01 | 1986-10-14 | Comdisco Resources, Inc. | Tool and combined tool support and casing section for use in transmitting data up a well |
US4724434A (en) * | 1984-05-01 | 1988-02-09 | Comdisco Resources, Inc. | Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well |
US4821035A (en) * | 1984-05-01 | 1989-04-11 | Comdisco Resources, Inc. | Method and apparatus using a well casing for transmitting data up a well |
US4845494A (en) * | 1984-05-01 | 1989-07-04 | Comdisco Resources, Inc. | Method and apparatus using casing and tubing for transmitting data up a well |
WO1990001610A1 (en) * | 1988-08-12 | 1990-02-22 | Langston Thomas J | Safety switch for explosive well tools |
US4967048A (en) * | 1988-08-12 | 1990-10-30 | Langston Thomas J | Safety switch for explosive well tools |
US5237136A (en) * | 1990-10-01 | 1993-08-17 | Langston Thomas J | Hydrostatic pressure responsive bypass safety switch |
US20020088620A1 (en) * | 1998-10-27 | 2002-07-11 | Lerche Nolan C. | Interactive and/or secure activation of a tool |
US20030213595A1 (en) * | 2002-05-16 | 2003-11-20 | Owen Oil Tools Lp. | Downhole tool deployment safety system and methods |
GB2395969A (en) * | 2002-02-15 | 2004-06-09 | Schlumberger Holdings | Isolating switch for a tool carrying explosives |
US20050045331A1 (en) * | 1998-10-27 | 2005-03-03 | Lerche Nolan C. | Secure activation of a downhole device |
US7669663B1 (en) * | 2009-04-16 | 2010-03-02 | Hall David R | Resettable actuator for downhole tool |
US20100212966A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation |
US20100212886A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation having a Seat with a Fluid By-Pass |
US20110139440A1 (en) * | 2009-12-11 | 2011-06-16 | Technological Research Ltd. | Method and apparatus for stimulating wells |
US8267196B2 (en) | 2005-11-21 | 2012-09-18 | Schlumberger Technology Corporation | Flow guide actuation |
US8281882B2 (en) | 2005-11-21 | 2012-10-09 | Schlumberger Technology Corporation | Jack element for a drill bit |
US8297375B2 (en) | 2005-11-21 | 2012-10-30 | Schlumberger Technology Corporation | Downhole turbine |
US8360174B2 (en) | 2006-03-23 | 2013-01-29 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US8522897B2 (en) | 2005-11-21 | 2013-09-03 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US9145764B2 (en) * | 2011-11-22 | 2015-09-29 | International Strategic Alliance, Lc | Pass-through bulkhead connection switch for a perforating gun |
WO2019135804A1 (en) * | 2018-01-05 | 2019-07-11 | Geodynamics, Inc. | Perforating gun system and method |
-
1971
- 1971-02-19 US US00116948A patent/US3758731A/en not_active Expired - Lifetime
Cited By (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4616702A (en) * | 1984-05-01 | 1986-10-14 | Comdisco Resources, Inc. | Tool and combined tool support and casing section for use in transmitting data up a well |
US4724434A (en) * | 1984-05-01 | 1988-02-09 | Comdisco Resources, Inc. | Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well |
US4821035A (en) * | 1984-05-01 | 1989-04-11 | Comdisco Resources, Inc. | Method and apparatus using a well casing for transmitting data up a well |
US4845494A (en) * | 1984-05-01 | 1989-07-04 | Comdisco Resources, Inc. | Method and apparatus using casing and tubing for transmitting data up a well |
WO1990001610A1 (en) * | 1988-08-12 | 1990-02-22 | Langston Thomas J | Safety switch for explosive well tools |
US4967048A (en) * | 1988-08-12 | 1990-10-30 | Langston Thomas J | Safety switch for explosive well tools |
US5237136A (en) * | 1990-10-01 | 1993-08-17 | Langston Thomas J | Hydrostatic pressure responsive bypass safety switch |
US20090168606A1 (en) * | 1998-10-27 | 2009-07-02 | Schlumberger Technology Corporation | Interactive and/or secure acivation of a tool |
US7383882B2 (en) | 1998-10-27 | 2008-06-10 | Schlumberger Technology Corporation | Interactive and/or secure activation of a tool |
US20020088620A1 (en) * | 1998-10-27 | 2002-07-11 | Lerche Nolan C. | Interactive and/or secure activation of a tool |
US9464508B2 (en) | 1998-10-27 | 2016-10-11 | Schlumberger Technology Corporation | Interactive and/or secure activation of a tool |
US20050045331A1 (en) * | 1998-10-27 | 2005-03-03 | Lerche Nolan C. | Secure activation of a downhole device |
US7347278B2 (en) | 1998-10-27 | 2008-03-25 | Schlumberger Technology Corporation | Secure activation of a downhole device |
GB2395969B (en) * | 2002-02-15 | 2005-11-23 | Schlumberger Holdings | Interactive and/or secure activation of a tool |
GB2395969A (en) * | 2002-02-15 | 2004-06-09 | Schlumberger Holdings | Isolating switch for a tool carrying explosives |
US20030213595A1 (en) * | 2002-05-16 | 2003-11-20 | Owen Oil Tools Lp. | Downhole tool deployment safety system and methods |
US6779605B2 (en) * | 2002-05-16 | 2004-08-24 | Owen Oil Tools Lp | Downhole tool deployment safety system and methods |
US8297375B2 (en) | 2005-11-21 | 2012-10-30 | Schlumberger Technology Corporation | Downhole turbine |
US8522897B2 (en) | 2005-11-21 | 2013-09-03 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US8408336B2 (en) | 2005-11-21 | 2013-04-02 | Schlumberger Technology Corporation | Flow guide actuation |
US8267196B2 (en) | 2005-11-21 | 2012-09-18 | Schlumberger Technology Corporation | Flow guide actuation |
US8281882B2 (en) | 2005-11-21 | 2012-10-09 | Schlumberger Technology Corporation | Jack element for a drill bit |
US8360174B2 (en) | 2006-03-23 | 2013-01-29 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US20100212886A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation having a Seat with a Fluid By-Pass |
US9133674B2 (en) | 2009-02-24 | 2015-09-15 | Schlumberger Technology Corporation | Downhole tool actuation having a seat with a fluid by-pass |
US8365843B2 (en) | 2009-02-24 | 2013-02-05 | Schlumberger Technology Corporation | Downhole tool actuation |
US8365842B2 (en) | 2009-02-24 | 2013-02-05 | Schlumberger Technology Corporation | Ratchet mechanism in a fluid actuated device |
US8371400B2 (en) | 2009-02-24 | 2013-02-12 | Schlumberger Technology Corporation | Downhole tool actuation |
US20100212885A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation having a Seat with a Fluid By-Pass |
US20100212966A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation |
US9127521B2 (en) | 2009-02-24 | 2015-09-08 | Schlumberger Technology Corporation | Downhole tool actuation having a seat with a fluid by-pass |
US7669663B1 (en) * | 2009-04-16 | 2010-03-02 | Hall David R | Resettable actuator for downhole tool |
US8613312B2 (en) * | 2009-12-11 | 2013-12-24 | Technological Research Ltd | Method and apparatus for stimulating wells |
US20110139440A1 (en) * | 2009-12-11 | 2011-06-16 | Technological Research Ltd. | Method and apparatus for stimulating wells |
US9145764B2 (en) * | 2011-11-22 | 2015-09-29 | International Strategic Alliance, Lc | Pass-through bulkhead connection switch for a perforating gun |
WO2019135804A1 (en) * | 2018-01-05 | 2019-07-11 | Geodynamics, Inc. | Perforating gun system and method |
US10584950B2 (en) | 2018-01-05 | 2020-03-10 | Geodynamics, Inc. | Perforating gun system and method |
US11009330B2 (en) * | 2018-01-05 | 2021-05-18 | Geodynamics, Inc. | Perforating gun system and method |
US11719523B2 (en) * | 2018-01-05 | 2023-08-08 | Geodynamics, Inc. | Perforating gun system and method |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: GEO VANN, INC. A CORP. OF NEW MEXICO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE. 9-21-77;ASSIGNOR:VANN, ROY R.;REEL/FRAME:003950/0314 Effective date: 19820217 |
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