[특허]Firing head connected between a coiled tubing and a perforating gun adapted to move freely within a tubing string and ac

Firing head connected between a coiled tubing and a perforating gun adapted to move freely within a tubing string and ac 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-043/116 E21B-043/12
출원번호	US-0405421 (1995-03-15)
발명자 / 주소	Huber Klaus B. (Sugarland TX) Edwards A. Glen (Hockley TX) Sayers Thomas M. (Houston TX) Smith Jr. Edward G. (San Leon TX)
출원인 / 주소	Schlumberger Technology Corporation (Houston TX 02)
인용정보	피인용 횟수 : 32 인용 특허 : 0

초록 ▼

A firing head adapted to connected between a coiled tubing and a perforating gun, is sized and shaped to enable it to move freely within a tubing string in the wellbore, may be actuated by fluid pressure within the coiled tubing, and includes a circulation and recirculation feature wherein wellbore fluid may be circulated through the firing head between the coiled tubing and an annulus around the tubing string, the circulation taking place either before or after detonation of the perforating gun. Three firing heads are discussed. One such firing head is a Circulation Direction Firing (CDF) Head. The CDF firing head circulates fluid from the wellbore to the coiled tubing and depresses a piston. Then, fluid pressure from the coiled tubing lifts the piston uncovering locking balls and propelling a firing pin to a booster of a detonating cord detonating the CDF firing head. Fluid circulation from the coiled tubing to the wellbore annulus begins after the CDF firing head detonates. Another such firing head is a Circulation Ball Firing (CBF) Head. The CBF firing head circulates fluid from the wellbore to the coiled tubing, receives a ball, and uses fluid pressure in the coiled tubing to lift a piston, uncover the locking balls and detonate the CBF firing head. Another such firing head is a Ball Actuated Circulation Firing (BCF) Head. The BCF firing head circulates fluid from the wellbore to the coiled tubing, receives a ball from the wellbore surface, and uses fluid pressure in the coiled tubing to push a piston downwardly which uncovers the locking balls and detonates the BCF firing head. Recirculation is permitted after the firing head detonates.

대표청구항 ▼

A method of operating a firing head adapted to be connected to a coiled tubing in a wellbore, a fluid adapted to be disposed within an interior of said coiled tubing, comprising the steps of: (a) moving said fluid from the interior of said coiled tubing into said firing head when said coiled tubing is connected to said firing head in said wellbore and said fluid is disposed within the interior of said coiled tubing, said firing head including an outer housing defining a central bore adapted to interconnect said coiled tubing to said firing head, a piston disposed within said outer housing adapted for moving and detonating said firing head, said central bore fluidly communicating said fluid in said interior of said coiled tubing between said coiled tubing and an interior of said firing head, and a port disposed through said outer housing adapted for fluidly communicating an external annulus with said interior of said firing head; and (b) detonating said firing head in response to the moving step (a), the detonating step (b) including the steps of, (b1) reverse circulating a fluid between said external annulus and said interior of said coiled tubing via said port, said interior of said firing head, and said central bore, and circulating said fluid from said interior of said coiled tubing, through said central bore, through said interior of said firing head, and toward said piston, (b2) moving said piston in response to the circulating step (b1), and (b3) detonating said firing head in response to said moving step (b2); and (c) continuing the step of circulating said fluid in step (b1) by circulating said fluid from said interior of said firing head, through said port, and into said external annulus.

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Kannan, Dhandayuthapani; Sask, David E.; Zhan, Lang; Filas, James G., System and method for optimizing production in a well.
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Firing head connected between a coiled tubing and a perforating gun adapted to move freely within a tubing string and ac 원문보기

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