Step-by-step deblocking packer and layered water injection pipe column
A packer and center pipe technology, applied in the field of downhole tools for oilfields, can solve the problems of large unpacking load and accidents, and achieve the effect of reducing tension and increasing the number
Inactive Publication Date: 2019-02-05
PETROCHINA CO LTD
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Problems solved by technology
This makes the unsealing load of the multi-stage packer too large when it is unsealed, which easily leads to accidents, and also limits the number of packers connected to the water injection string, restricting the development of multi-layered and subdivided water injection. layer-wise development
Method used
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[0072]In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.
[0073] In the first aspect, the embodiment of the present invention provides a step-by-step unpacking packer, such as figure 1 , figure 2 , image 3 and Figure 4 As shown, the step-by-step unpacking packer includes:
[0074] The upper joint 1, the upper central pipe 8, the lower central pipe 21 and the lower joint 26 which are threaded in sequence; the rubber sleeve bushing 9 set outside the upper central pipe 8; the rubber sleeve bushing 9 set outside, and the upper end The connecting cylinder 7 connected with the upper joint 1; the upper rubber cylinder seat 11 which is sleeved ...
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The invention discloses a step-by-step deblocking packer and a layered water injection pipe column. The packer comprises an upper joint, an upper central pipe, a lower central pipe, a lower joint, a rubber cylinder bush, a connecting cylinder, an upper rubber cylinder base, a lower rubber cylinder base, a rubber cylinder, a locking cylinder, a lock ring sleeve, a setting piston and a setting sleeve connected with the setting piston through a setting shearing nail; when the setting shearing nail is cut off, the setting piston can move upwards; the lower end of the upper central pipe is providedwith an inner thread, the upper end of the lower central pipe is provided with an outer thread, and at least two grooves are formed upwards from the lower end face of the upper central pipe in the circumferential direction of the upper central pipe. When the step-by-step deblocking packer is deblocked, the upper central pipe is separated from the lower central pipe, force borne by the upper central pipe cannot continue to be transmitted downwards after being transmitted to the lower central pipe only one step of the packer is deblocked accordingly when the pipe column is lifted once, step-by-step deblocking of the packer in the water injection pipe column is achieved, and the quantity of packers connected to the water injection pipe column is increased.
Description
technical field [0001] The invention relates to the technical field of downhole tools used in oil fields, in particular to a step-by-step unpacking packer and a layered water injection string. Background technique [0002] As oilfield development enters a high water cut period, layered water injection has become an important means to enhance oil recovery. In layered water injection, multi-stage packers need to be connected to the water injection string. The oil layer is separated into multiple intervals by multi-stage packers. [0003] Existing packers mainly rely on the compression of the rubber cartridge to achieve setting, thereby separating the oil layer into multiple intervals. When unsealing, unsealing is realized by lifting the string to make the rubber cartridge rebound. [0004] When the existing packer is unpacked, the multi-stage packers are unpacked together. Therefore, the force when lifting the string is the sum of the unpacking loads of the multi-stage pack...
Claims
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Login to View More IPC IPC(8): E21B33/122E21B43/20
CPCE21B33/122E21B43/20
Inventor 张宏伟胡金铜舒畅杜晓霞王明燕王文韬杨天成姜晓波田福春王宁
Owner PETROCHINA CO LTD