[특허]Downhole activated process and apparatus for deep perforation of the formation in a wellbore

Downhole activated process and apparatus for deep perforation of the formation in a wellbore 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-043/112 E21B-043/116
출원번호	US-0760549 (1991-09-16)
발명자 / 주소	Wilson Dennis R. (Ponca City OK) Coffee Robert L. (Newkirk OK)
출원인 / 주소	Conoco Inc. (Ponca City OK 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

This invention relates to a method and apparatus for perforating the formation in a wellbore wherein the wellbore is established for the production of hydrocarbons. The formation is perforated by explosive material carried in pistons which are carried within either the pipe casing or the collars or both and remain generally within the maximum outward profile of the pipe string so as not to interfere with the movement and placement of the pipe string in the wellbore. The pipe string may be rotated, reciprocated and circulated which enhances the ability of the installer to place the pipe string in a deviated or long reach wellbore. Once the pipe string is in place, the pistons may be deployed by one of several methods such that pistons mounted in openings in the peripheral wall of the pipe string move outwardly with sufficient force to move the pipe string way from the walls of the wellbore sufficient to form a complete annulus for cementing. Once the wellbore is cemented the explosive charges in the pistons may be detonated to perforate the formation adjacent the piston. The charge may be particularly designed to focus the explosion so that an extensive perforation extends away from the pistons so that the formation is opened up for production of hydrocarbons.

대표청구항 ▼

An apparatus for perforating a formation in a wellbore wherein the wellbore is established for the production of hydrocarbons, said apparatus comprising: a casing pipe for being installed in the wellbore adjacent the formation to be perforated, said casing pipe having at least one opening in the peripheral wall thereof; a piston for being mounted in the opening in said casing pipe and for outward extensible movement to contact the wall of the formation in the wellbore, wherein said piston includes explosive material therein; means for deploying said piston from a retracted position which is generally within the maximum exterior profile of said casing pipe to an extended position wherein said piston projects outwardly from the opening to contact the wall of the wellbore; and means for detonating said explosive material in said piston when said piston is in said extended position to perforate the formation adjacent to said piston so that a pathway is created in the formation leading to said opening in said casing pipe. A method of installing a casing string in a wellbore traversing earth formations wherein the wellbore is for the production of hydrocarbons from the earth formations and the casing string is preferably spaced from the walls of the wellbore, the process comprising the steps of: running the casing string into the wellbore, wherein a portion of the casing string has a plurality of pistons installed in openings in the peripheral wall of the casing string for outward extensible movement from a retracted position generally within the maximum exterior profile of the casing string to an extended position wherein the pistons project outwardly from the casing string wherein certain preselected pistons include explosive material therein; deploying the pistons from the retracted position to the extended position when the casing string is suitably positioned in the wellbore to move portions of the casing string which are in contact with the walls of the wellbore away therefrom so that the casing string is spaced from the walls of the wellbore; securing the pistons in the extended position to hold the casing string away from the walls of the wellbore; and detonating the explosive material in the preselected pistons to create extensive perforations within the formation adjacent to the preselected pistons for the formation to communicate with the casing string.

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Downhole activated process and apparatus for deep perforation of the formation in a wellbore 원문보기

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