Firing mechanism for a perforating gun or other downhole tool
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/1185
출원번호
US-0332230
(2014-07-15)
등록번호
US-9945214
(2018-04-17)
발명자
/ 주소
Coffey, Nathan Brian
Mytopher, Terry Lee
출원인 / 주소
Nine Energy Canada Inc.
대리인 / 주소
Vinson & Elkins LLP
인용정보
피인용 횟수 :
0인용 특허 :
20
초록▼
A firing assembly for a wellbore perforating gun or other downhole tool includes: one or more casings connected together to form a firing head containment body, the firing head containment body is in fluid communication with a firing assembly that includes a click pressure firing module that allows
A firing assembly for a wellbore perforating gun or other downhole tool includes: one or more casings connected together to form a firing head containment body, the firing head containment body is in fluid communication with a firing assembly that includes a click pressure firing module that allows the wellbore to be pressurized to high pressures required for pressure testing the well casing one or more times without firing the gun or actuating a certain downhole tool, and after a predetermined number of pressure increase events, allows the subsequent high pressure activation to reach the firing pin or actuation device and fire the gun or activate the tool without further activity from the surface other than applying the pressure.
대표청구항▼
1. A firing assembly for detonating charges of a perforating gun, the firing assembly comprising: a casing having a first end and a second end and forming an internal chamber and comprising a slot; andan actuating assembly disposed in the internal chamber; wherein the actuating assembly comprises: a
1. A firing assembly for detonating charges of a perforating gun, the firing assembly comprising: a casing having a first end and a second end and forming an internal chamber and comprising a slot; andan actuating assembly disposed in the internal chamber; wherein the actuating assembly comprises: a piston valve positioned, at least partly within the first end of the internal chamber and rotatable and slideable within the internal chamber; wherein the piston valve is slideable from a first position in which the first end of the internal chamber is blocked and a second position in which the first end of the internal chamber is open to provide fluid communication between the internal chamber and the first end of the casing;a slot pin rigidly connected to the piston valve and disposed in said slot; anda firing pin at least partly contained in and in fluid communication with the internal chamber and extending toward or through the second end of the casing and held in place in the casing by a retention detent; wherein the slot defines a series of curves separated by discrete stop points for the slot pin configured such that a change in pressure from higher to lower, or from lower to higher causes the slot pin to move toward a terminal end of the slot to the next stop point, and wherein the terminal end of the slot allows the piston valve to move to the second position effective to transfer fluid pressure to the firing pin, and to cause the retention detait to fail. 2. The firing assembly of claim 1, further comprising a flexible actuation member disposed between the piston valve and the firing pin and biasing the piston valve toward the first end of the casing. 3. The firing assembly of claim 2, wherein the piston valve and the flexible actuation member are separated by a thrust bearing. 4. The firing assembly of claim 3, wherein the flexible actuation member comprises a disc spring. 5. The firing assembly of claim 1, wherein the firing pin is configured to actuate a detonator by mechanical force when released by failure of the retention detent. 6. The firing assembly of claim 1, wherein the firing pin is configured to actuate a second firing assembly. 7. A firing assembly for a perforating gun comprising: a tubular casing forming an internal chamber, said internal chamber comprising an uphole end in fluid communication with a wellbore and a downhole end in fluid communication with a perforating gun; anda firing assembly recess formed in the tubular casing, comprising an inlet channel in fluid communication with the internal chamber at a first end of the firing assembly recess;a firing assembly module disposed in the firing assembly recess; said firing assembly comprising:a firing assembly outer casing forming an internal chamber and having a first end in fluid communication with the inlet channel and forming a slot near the first end of the firing assembly outer casing, configured to accept a slot pin attached to a piston valve;a piston valve disposed at least partly inside the first end of the firing assembly outer casing comprising a slot pin attached to the piston valve and inserted into the slot formed in the firing assembly outer casing; anda firing pin near a second end of the firing assembly module opposite said first end, said firing pin in fluid communication with the piston valve, in mechanically operative connection with the piston valve, or a combination thereof and held rigidly in the firing assembly outer casing by a retention detent; such that fluid pressure in the inlet channel above a selected threshold causes the retention detent, to fail or shear, releasing the firing pin; wherein the slot pin and slot are configured to prevent one or more high pressure pulses in the inlet channel from causing the retention detent to fail, and further wherein after a predetermined number of high pressure pulses, a subsequent increase in pressure above the selected threshold is transferred to the firing pin effective to release of the firing pin to move at least partially out of the second end of the firing assembly outer casing. 8. The firing assembly of claim 7, further comprising a detonator adjacent the firing pin configured such that release of the firing pin causes detonation of the detonator. 9. The firing assembly of claim 8, wherein the detonator is connected to a detonation cord and the detonation cord is connected to a plurality of perforating charges configured in the tubular wall of a wellbore subassembly. 10. The firing assembly of claim 9, wherein the perforating charges are configured to fire into the center of the wellbore subassembly, through the exterior wall of the wellbore subassembly or both. 11. The firing assembly of claim 10, wherein one or more sets of perforating charges are disposed in proximity to each other and such that a first member of the set is positioned to fire inwardly into the center of the wellbore subassembly and a second member of the set is positioned to fire outwardly through the exterior wall of the wellbore subassembly. 12. The firing assembly of claim 11, wherein the first and second members of a set of perforating charges are positioned to fire substantially simultaneously when the detonator is detonated. 13. A downhole tool assembly configured for incorporation into a drill string comprised of tubular casing forming an interior channel, the downhole tool assembly comprising a multi-pressure switch assembly, said multi-pressure switch assembly comprising: an outer casing forming an internal chamber and having a first end in fluid communication with said interior channel and a second end opposite said first end and said outer casing comprising a slot configured to accept a slot pin attached to a piston valve disposed in the internal chamber; andan actuating subassembly disposed in the internal chamber; the actuating subassembly comprising: a piston valve positioned at least partly within the first end of the internal chamber and rotatable and slideable within the internal chamber;a slot pin rigidly connected to the piston valve and inserted into said slot;a flexible actuation member biasing the piston valve toward the first end of the outer casing; andan actuator adjacent the side of the spring nearer the second end of the outer casing and extending toward or through the second end of the outer casing and held in place in the outer casing by a retention detent; wherein the slot defines a series of curves separated by discrete stop points for the slot pin configured such that an increase in pressure or a decrease in pressure in the wellbore causes the slot pin to move toward a terminal end of the slot to the adjacent stop point, and wherein the terminal end of the slot allows the wellbore pressure on the piston valve to be transferred to the actuator effective to cause the shear pin or detent to fail and release the actuator. 14. The assembly of claim 13, wherein the actuator is a firing pin. 15. The assembly of claim 13, wherein the actuator is adjacent a pressure chamber and actuation allows fluid pressure from the wellbore into the pressure chamber. 16. The assembly of claim 15, wherein the downhole tool assembly comprises: a cylindrical wall enclosing a central core;a first end and a second end of the cylindrical wall sized and configured to connect to adjacent drill pipe and form a continuous fluid path through the core of the assembly;a central section disposed between the first end and the second end and forming a plurality of openings effective to provide fluid communication between the central core of the drill string and the exterior of the assembly; anda slidable sleeve disposed adjacent the central section and slidable from a first position in which the sleeve covers said openings and a second position in which the openings are uncovered to provide fluid communication between the inner core and the environment external to the assembly;wherein the sleeve comprises a flange extending into the pressure chamber configured such that release of high pressure fluid into the chamber by the actuating assembly is effective to move the sleeve from a first position to a second position.
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이 특허에 인용된 특허 (20)
Hartley Alan C. (Rocky Rapids CAX) Krasey Russell S. J. (Calgary CAX), Apparatus and method for horizontal well fracture stimulation.
Bell, Matthew Robert George; Murphy, Eugene; Cernocky, Edward Paul; Burres, Christopher; Ekelund, Aron; Lindfors, Allen, Casing conveyed well perforating apparatus and method.
Randy C. Tolman ; Lawrence O. Carlson ; David A. Kinison ; Kris J. Nygaard ; Glenn S. Goss ; William A. Sorem ; Lee L. Shafer, Method and apparatus for stimulation of multiple formation intervals.
Tolman, Randy C.; Kinison, David A.; Nygaard, Kris J.; Sorem, William A.; Hall, Timothy J.; Bailey, Jeffrey R., Perforating gun assembly for use in multi-stage stimulation operations.
Vella,Mark; Hromas,Joe C.; Gill,Bennie; Grigar,Larry; Henderson,Steven W., Techniques and systems associated with perforation and the installation of downhole tools.
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