EP0155128A2 - Dispositif pour actionner des charges explosives dans un puits et méthode de perforation d'un puits - Google Patents

Dispositif pour actionner des charges explosives dans un puits et méthode de perforation d'un puits Download PDF

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Publication number
EP0155128A2
EP0155128A2 EP85301428A EP85301428A EP0155128A2 EP 0155128 A2 EP0155128 A2 EP 0155128A2 EP 85301428 A EP85301428 A EP 85301428A EP 85301428 A EP85301428 A EP 85301428A EP 0155128 A2 EP0155128 A2 EP 0155128A2
Authority
EP
European Patent Office
Prior art keywords
delay
time delay
pressure
initiation
ambient temperature
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
Application number
EP85301428A
Other languages
German (de)
English (en)
Other versions
EP0155128B1 (fr
EP0155128A3 (en
Inventor
Edward A. Colle, Jr.
Flint Raymond George
Donald N. Yates, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Co
Original Assignee
Geo Vann Inc
Halliburton Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Geo Vann Inc, Halliburton Co filed Critical Geo Vann Inc
Publication of EP0155128A2 publication Critical patent/EP0155128A2/fr
Publication of EP0155128A3 publication Critical patent/EP0155128A3/en
Application granted granted Critical
Publication of EP0155128B1 publication Critical patent/EP0155128B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B43/11852—Ignition systems hydraulically actuated
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition

Definitions

  • This invention relates generally to the actuation of explosives in boreholes.
  • one aspect of the present invention relates to a device for actuating an explosive charge downhole in a wellbore, comprising means for actuating the explosive charge in response to an actuation signal.
  • a second aspect of the present invention relates particularly to a method of perforating the outer surface of a borehole, the steps of positioning a pressure actuable perforating means adjacent a desired location in the borehole and raising the pressure in the borehole to a level sufficient to initiate actuation of the perforating means.
  • Explosive charges are utilized in wellbores to perform various functions, for example, to perforate a well casing to complete or test a formation, or to set a packer or other device downhole. Due to the time and expense involved in these operations and the explosive power of these devices, it is essential that their operation be reliable.
  • the typical wellbore environment poses severe difficulties for the operation of explosive devices downhole, which thus tends to reduce their reliability. For example, extremes of temperature are common which tend to degrade the operation of explosives, and the presence of heavy drilling muds and debris can interfere with a firing apparatus. Impact responsive firing heads can become fouled by debris and particles settling out from the drilling mud.
  • an impact responsive firing head In drill stem testing, a zone to be tested is perforated and various downhole parameters such as temperature and pressure are monitored by instruments mounted between the tubing and the firing head. These are non-fullbore opening devices which typically do not permit a detonating bar to pass through to the firing head. In these applications, therefore, pressure responsive firing devices are desired for use.
  • a complication introduced in the use of pressure responsive firing devices is that they require the manipulation of pressure in the annulus or the tubing to actuate the firing device.
  • the device of the first aspect of this invention is characterised by initiation means for providing an initiation signal in response to a first presure condition in at least a portion of the wellbore and delay means responsive to the initiation signal for producing the actuation signal after a time delay period providing sufficient time for an operator to alter the first pressure condition to a second presure condition desired at the time of explosive actuation.
  • the method of the second aspect of this invention is characterised by the steps of providing a time delay between attainment of the initiation pressure and the actuation of the perforating means and reducing the pressure within the borehole adjacent the desired location from the initiating pressure to a desired perforating pressure prior to actuation of the perforating means.
  • the device further comprises means for providing a signal indicating the actuation of the actuation means in a form adapted to be transmitted to the surface of the wellbore. Accordingly, the operator can be informed that the delay means has been actuated so that he can begin to bleed off pressure in the wellbore, if so desired, prior to actuation of the explosive.
  • the delay means is disposed in a chamber to which it is adpated to release combustion gas as its combustive reaction proceeds.
  • the device further comprises means for venting the combustion gas released by the delay means from the chamber outwardly of the device.
  • heat and pressure from the delay means is dissipated outside the device as the combustive reaction proceeds. This aids in preventing a build up of temperature and pressure in the chamber which, if not prevented, will cause the time delay to become unpredictable.
  • the device 10 thereof includes an upper sub-assembly or sub 12 having an upper set of threads 14 for coupling the device 10 to a tubing string for lowering into a well, or for coupling other downhole devices to device 10.
  • Upper sub 12 has a reduced diameter, lower portion 16 forming a pin threadely coupled to a housing 18 and sealed thereagainst by a pair of 0-rings 17.
  • Housing 18 is threaded at a lower portion 20 thereof for coupling the device 10 to a perforating gun or other downhole explosive device.
  • upper sub 12 Immediately beneath the threaded portion 14, upper sub 12 has a first relatively large diameter counterbore 22 bounded at its lower extremity by an annular shoulder 24. Beginning at an inner edge of shoulder 24 is a downwardly extending second, relatively smaller diameter counterbore 26 extending through a lower extremity of upper sub 12.
  • a piston ram 30 has an upper piston 32 fitting closely against the counterbore 26 of upper sub 12 and having two 0-ring seals 34 providing a fluid tight seal between the piston 32 and the counterbore 26. Piston 32 extends upwardly from counterbore 26 and is spaced concentrically from counterbore 22.
  • An annularly shaped piston retainer 35 is fitted within and threadedly coupled to the counterbore 22 and is prevented from moving downwardly within upper sub 12 by the shoulder 24.
  • Retainer 35 has an inner surface dimensioned to fit closely against the outer surface of the piston 32.
  • six shear pins 36 couple the piston ram 30 to the piston retainer 35 to restrain the piston ram 30 against movement downwardly with respect to upper sub 12 until such time as a sufficient pressure differeential is applied across the piston 32 of piston ram 30 to shear the pins 36.
  • Piston ram 30 also includes a downwardly extending, reduced diameter projection 40 having a plurality of radially extending fins 42 which serve in part to center the projection 40 in the counterbore 26. Fins 42 also limit the downward travel of ram 30, as described more fully below.
  • a generally cylindrical upper plug 44 is threadedly retained within a counterbore 46 of the housing 18.
  • Upper plug 44 has a pair of 0-ring seals 48 forming a fluid tight seal with the housing 18 at the counterbore 46.
  • Upper plug 44 has a first concentric relatively large diameter counterbore 50 extending from an opening in an upper surface of the plug 44 outwardly to an inwardly extending shoulder 52.
  • Extending downwardly from an inner extremity of the shoulder 52 is a second relatively smaller diameter concentric counterbore 54 which terminates at a shoulder 56.
  • Extending downwardly from an inner extremity of shoulder 56 is a third counterbore 58 having yet a smaller diameter.
  • Extending from the counterbore 58 through the lower extremity of upper plug 44 is a relatively small concentric cylindrical opening 60.
  • the lower extremity of opening 60 is hermetically sealed by a circular stainless steel closure disk 62 spot welded to the upper plug 44.
  • a firing pin 66 is held within the counterbore 50 and above the counterbore 54 by a shear pin 68.
  • Firing pin 66 has an upper surface 70 positioned to receive the impact of projection 40 of piston ram 30 in order to force the firing pin 66 downwardly within counterbore 50 of upper plug 44.
  • a lower portion of firing pin 66 is formed as a relatively narrow projection 72 which impacts against a percussion primer assembly 100 when the firing pin 66 is forced downwardly from counterbore 50.
  • Assembly 100 is held within counterbore 58 by a primer retainer 102 which is threaded into counterbore 54.
  • Retainer 102 has a concentric opening therethrough shaped to receive the lower portion of firing pin 66 and guide the projection 72 into engagement with the primer assembly 100.
  • the firing pin 66 has a number of depressions 104 in an outer surface of its upper, relatively large dimaeter portion to permit air beneath firing pin 66 to flow upwardly past it as firing pin 66 moves downwardly.
  • the percussion primer assembly 100 includes a generally cylindrical primer cup 102 having an upper flat surface 104 and a lower flat surface 106.
  • the surface 106 has a concentric, cylindrical bore 108 formed therethrough toward surface 104.
  • a concentric, cylindrical counterbore 110 also is formed in cup 102 from an upper boundary of bore 108 and terminating a short distance from surface 104, thus to form a thin well or web 112 therebetween.
  • Counterbore 110 forms an annular shoulder 114 at the upper boundary of bore 108.
  • Primer cup 102 may be made, for example, of stainless steel.
  • Counterbore 110 is filled with a primer mix 116, described in greater detail below.
  • a stainless steel closure disc 118 is positioned against shoulder 114 to retain the primer mix 116 in counterbore 110.
  • Disc 118 is pressed upwardly against shoulder 114 by a cylindrically shaped stainless steel anvil 120 positioned within bore 108.
  • a lower surface 122 of anvil 120 is flush with surface 106.
  • a second stainless steel closure disc 124 is spot welded to surface 106 to support the anvil 120 within cup 120 and to provide a hermetic seal to protect the primer mix 116 against mositure as well as gases produced by other pyrotechnic material in the device 10.
  • the primer mix 116 is a pyrotechnic mixture of titanium and potassium perchlorate mixed in a weight ratio of 41% titanium to 59% potassium perchlorate.
  • the titanium is provided in powdered form with particles ranging from 1 to 3 microns in diameter and the potassium perchlorate is provided in powdered from with particles less than 10 microns in diameter.
  • the thickness of the web 112 and the depth of the counterbore 110, together with the compaction of the primer mix 116, are selected to achieve the desired impact sensitivity. That is, as the thickness of web 112 is increased, impact sensitivity of the primer mix 116 in the assembly 100 is decreased, and as the depth of counterbore 110 is increased, so likewise is the impact sensitivity decreased. Moreover, as the density of the primer mix is increased (by increasing the compaction pressure), so also is the impact senstivity lowered. In the disclosed, embodiment, the thickness of the web 112 is nominally 0.011 inch (0.28mm) thick and the depth of the counterbore 110 is nominally 0.035 (0.89mm) inch deep. When the primer mix is compacted from 68% to 81% of crystal density in this housing, an impact sensitivity in excess of 4 feet lbf (5.4 J) can be achieved and often is.
  • the projection 72 of firing pin 66 impacts the web 112 to deform it inwardly, thus forcing the primer mix 116 against the anvil 120 to ignite it.
  • Web 112 is made sufficiently thin so taht it will be deforemed adequately by the impact of the projection to ensure ignition.
  • the hot gasses thus produced shatter the thin closure disc 118.
  • Anvil 120 is provided with four longitudinally extending openings 128 therethrough which then form four jets of hot ignition gas and steel particules from disc 118. These jets of gas then burst through disc 124 to provide a means of igniting a flash sensitive, first fire mix, such as AlA.
  • a lower plug 130 is threadely received within a counterbore 132 of the lower portion 20 of housing 18.
  • Lower plug 130 has a central aperture 134 therethrough with a threaded lower portion.
  • An elongate, generally cylindrical delay element assembly 136 is threaded at a reduced diameter lower portion 138 thereof.
  • Portion 138 of assembly 136 is threaded into the aperture 134 so that a lower surface of portion 138 is flush with a lower surface of plug 130.
  • An upper relatively larger diameter portion 142 of assembly 136 extends upwardly from plug 130.
  • An upper surface 144 of portion 142 is disposed adjacent aperture 60 of upper plug 44.
  • Housing 18 has a further counterbore 146 spaced from upper portion 142 of assembly 136 to define a plenum chamber therebetween.
  • the jet of gases and hot particles emitted through aperture 60 by primer assembly 100 in response to the impact of projection 72 of firing pin 66 acts as a signal to initiate a combustion reaction within assembly 136.
  • This combustive reaction proceeds for a period of time sufficient to permit an operator at the wellhead to reduce the pressure in the well to a lower value desired at the time that he perforating guns are detonated by the device 10.
  • a detonation initiator within the lower end of portion 138 detonates a detonating cord (not shown) coupled to the lower end of portion 138 in order to detonate the guns.
  • Lower plug 130 is provided with a plurality of vent apertures 150 therethrough and sealed at their upper ends by closure discs 152.
  • closure discs 152 As the combustion gases accumulate within the plenum chamber, they build up a slight pressure differential across the closure discs 152, causing them to rupture and permit the gases to pass downwardly through the apertures 150 so that the gases vent into the gun carriers coupled with the lower portion 20 of housing 18. Since the interior of the device 10 below the piston 32 of the piston ram 30 is sealed against fluid pressure and the gun carrier liklewise is sealed against fluid pressure, the pressure within the plenum chamber will remain essentially at one atmosphere. In addition, the venting of the combustion gases dissipates heat from the assembly 136. Accordingly, the principal factor in determining the length of the delay provided by the delay element assembly 136 is the downhole ambient temperature.
  • delay element assembly 136 includes a generally cylindrical housing 160 having a central cylindrical aperture 162.
  • a cylindrical pellet 164 of AlA first fire mix is positioned within aperture 162 so that an upper surface of pellet 164 is flush with the surface 144 of assembly 136 and extends downwardly a short distance therefrom.
  • Aperture 162 is closed at surface 144 by an adhesive high temperature closure disc 166.
  • a succession of tungston delay composition discs 168 are positioned within aperture 162 to extend from pellet 164 downwardly to a point within aperture 162 approximately half way through the extent of aperture 162 through lower portion 138.
  • 55 tungston composition discs (mil-T-23132) were utilized, each disc having 500 milligrams of composition compressed at 30,000 psi (210 MN/m 2 ) and forming a column approximately 10 inches (250mm) high.
  • this embodiment provides a burn time of 460 seconds at room temperature, a burn time of 420 seconds at 250°F (120°C) after heating at 250°F (120°C) for 100 hours, a burn time of 388 seconds at 300°F (150°C) after heating at 300°F (150°C) for 100 hours, and a burn time of 312 seconds at 400°F (200°C) after heating at 400°F (200°C) for 100 hours.
  • A1A 170 Positioned within the aperture 162 immediately below the lowermost tungston disc 168 is a second pellet of A1A 170. Immediately below the pellet 170 is a pellet of a titanium/potassium perchlorate flash charge 172. Immediately below the pellet 172 is a detonator having an upper booster 174 of lead azide (RD-1333) and a lower high explosive output charge 176 which may be either PYX or HNS-11. Aperture 162 is closed at its lower end by a closure disc 178 spot welded to the housing 160.
  • the last tungston delay element 168 When the last tungston delay element 168 has burned through, its ignites the AlA charge 170 which in turn ignites the charge 172 which serves to provide a deflagrating output to the booster 174 which in turn detonates the high explosive charge 176. This detonation is transferred to the detonating cord of the perforating guns to cause them to fire, and may thus be regarded as an explosive actuation signal.
  • Figure 5 illustrating a portion of a borehole formed in the earth and lined with a casing 190.
  • a tubing string 192 terminates at its lower end by a perforated nipple 194.
  • the upper sub 12 of the device 100 is threadedly coupled to the lower extremity of the nipple 194 and a lower portion 20 is threadedly coupled to a string of perforating guns 196 extending downwardly therefrom and positioned opposite a portion 198 of the casing 190 which it is desired to perforate with the guns 196.
  • a shot detection device 200 which is operative to provide a signal transmitted upwardly through the tubing string 192 to the wellhead after a time delay provided by a combustion time delay element incorporated within the shot detection device 200.
  • Shot detection device 200 may be, for example, that disclosed in European Patent Application Publication No. EP0129350A.
  • the hydrostatic pressure in the lower annulus is adjusted accordingly, for example by swabbing well fluids from the tubing string 192.
  • the heavier fluid in the tubing 192 is replaced with a lighter fluid to give the desired underbalance and then the pressure in the tubing string is increased until the pins 36 ( Figure 1) shear causing the piston ram 30 to move downwardly very rapidly to impact the firing pin 66, thus shearing the pin 68 holding the pin 66 and ramming the projection 72 into the assembly 100 to initiate the combustion reaction within delay assembly 136.
  • the operator at the wellhead begins to reduce the pressure in the annulus beneath packer 202 as the combustive reaction proceeds within the assembly 136.
  • the combustive reaction within assembly 136 terminates with the detonation of the high explosive charge 176, thus detonating the guns 196.
  • the device 200 emits a second vibrational signal through the tubing string to the surface in the event that the detonating cord within the;guns 196 has detonated its entire length.
  • FIG. 6 differs from that of Figure 5 in that the device 10 has been mounted beneath the perforating guns 198 and in an upside-down arrangement so that its normally upper end 12 is now the lowermost portion of the device 10.
  • a perforated bull plug 206 is threadedly coupled to end 12 of device 10 so that pressure within the annulus beneath the packer 202 can beiapplied to the piston 32 of device 10.
  • the guns 198 are suspended from blank, fluid tight tubing 208 which in turn is suspended from the shot detection device 200.
  • Device 200 is in turn coupled at its upper end to the perforated nipple 194.
  • An advantage of the Figure 6 arrangement is that if fluid pressure invades the guns 198 or blank tubing prior to detonation, fluids will accumulate in the device 10. By utilizing a fluid sensitive detonator in device 10, so that fluid in the guns 198 accumulates below in the device 10, detonation of a wet string of guns can be prevented in the arrangement of Figure 6.
  • boosters include a single secondary high explosive which acts both as an acceptor and donor.
  • the high explosive can be, for example, HMX compacted to a density of 1.71 gm/cm in a cup of guilding metal, stainless steel or aluminium, or PYX compacted to a density of 1.4555 gm/cm 3 in such a cup. An open end of the cup is then crimped over the end of the detonating cord.
  • the device of the present invention is also advantageous for use in drill stem testing, wherein non-fullbore opening devices are suspended in the tubing string above the perforating guns. Such devices render it difficult to pass a detonating bar downwardly through the tubing to impact upon a mechanical firing head, but do not affect the operation of a pressure actuated initiator such as device 10.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Paper (AREA)
  • Manipulator (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP19850301428 1984-03-08 1985-03-01 Dispositif pour actionner des charges explosives dans un puits et méthode de perforation d'un puits Expired EP0155128B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58734584A 1984-03-08 1984-03-08
US587345 1984-03-08

Publications (3)

Publication Number Publication Date
EP0155128A2 true EP0155128A2 (fr) 1985-09-18
EP0155128A3 EP0155128A3 (en) 1986-04-16
EP0155128B1 EP0155128B1 (fr) 1988-08-03

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Application Number Title Priority Date Filing Date
EP19850301428 Expired EP0155128B1 (fr) 1984-03-08 1985-03-01 Dispositif pour actionner des charges explosives dans un puits et méthode de perforation d'un puits

Country Status (4)

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EP (1) EP0155128B1 (fr)
JP (1) JPS60203796A (fr)
CA (1) CA1224139A (fr)
DE (1) DE3564145D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721051A3 (fr) * 1995-01-04 1998-04-22 Baker Hughes Incorporated Mise en marche d'une tête de détonation
GB2396175A (en) * 2002-12-11 2004-06-16 Schlumberger Holdings Controlling transient underbalance in a wellbore
US9759048B2 (en) 2015-06-29 2017-09-12 Owen Oil Tools Lp Perforating gun for underbalanced perforating
CN109072685A (zh) * 2016-02-25 2018-12-21 地球动力学公司 可降解材料时间延迟系统和方法
US11346184B2 (en) 2018-07-31 2022-05-31 Schlumberger Technology Corporation Delayed drop assembly

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770246A (en) * 1986-08-11 1988-09-13 Dresser Industries, Inc. Method and apparatus for firing borehole perforating apparatus
US4804044A (en) * 1987-04-20 1989-02-14 Halliburton Services Perforating gun firing tool and method of operation
US4969525A (en) * 1989-09-01 1990-11-13 Halliburton Company Firing head for a perforating gun assembly
US5078210A (en) * 1989-09-06 1992-01-07 Halliburton Company Time delay perforating apparatus
CA2024677A1 (fr) * 1989-09-06 1991-03-07 Kevin R. George Dispositif de perforation temporise
US7284612B2 (en) 2000-03-02 2007-10-23 Schlumberger Technology Corporation Controlling transient pressure conditions in a wellbore
US7243725B2 (en) 2004-05-08 2007-07-17 Halliburton Energy Services, Inc. Surge chamber assembly and method for perforating in dynamic underbalanced conditions

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381081A (en) * 1939-02-02 1945-08-07 Schlumberger Marcel Gun perforator
US3189094A (en) * 1963-01-03 1965-06-15 Halliburton Co Firing apparatus for gun perforators
GB1024256A (en) * 1961-09-22 1966-03-30 Dynamit Nobel Ag Detonation interrupter
GB2054107A (en) * 1979-06-06 1981-02-11 Sie Inc Arming device for explosive well tools
GB2081344A (en) * 1980-08-05 1982-02-17 Vann Roy Randell Well completion apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381081A (en) * 1939-02-02 1945-08-07 Schlumberger Marcel Gun perforator
GB1024256A (en) * 1961-09-22 1966-03-30 Dynamit Nobel Ag Detonation interrupter
US3189094A (en) * 1963-01-03 1965-06-15 Halliburton Co Firing apparatus for gun perforators
GB2054107A (en) * 1979-06-06 1981-02-11 Sie Inc Arming device for explosive well tools
GB2081344A (en) * 1980-08-05 1982-02-17 Vann Roy Randell Well completion apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721051A3 (fr) * 1995-01-04 1998-04-22 Baker Hughes Incorporated Mise en marche d'une tête de détonation
GB2396175A (en) * 2002-12-11 2004-06-16 Schlumberger Holdings Controlling transient underbalance in a wellbore
GB2396175B (en) * 2002-12-11 2005-12-14 Schlumberger Holdings Controlling transient underbalance in a wellbore
US9759048B2 (en) 2015-06-29 2017-09-12 Owen Oil Tools Lp Perforating gun for underbalanced perforating
CN109072685A (zh) * 2016-02-25 2018-12-21 地球动力学公司 可降解材料时间延迟系统和方法
CN109072685B (zh) * 2016-02-25 2019-12-27 地球动力学公司 可降解材料时间延迟系统和方法
US11346184B2 (en) 2018-07-31 2022-05-31 Schlumberger Technology Corporation Delayed drop assembly

Also Published As

Publication number Publication date
DE3564145D1 (en) 1988-09-08
EP0155128B1 (fr) 1988-08-03
CA1224139A (fr) 1987-07-14
JPH0472957B2 (fr) 1992-11-19
EP0155128A3 (en) 1986-04-16
JPS60203796A (ja) 1985-10-15

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