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Separate layer fracturing packer

A layered fracturing and packer technology, applied in the field of layered fracturing, can solve problems such as poor sealing, inability to realize subdivided layer fracturing technology, difficulty in unsealing, etc., and achieve force balance and simple structure , The effect of easy unsealing

Inactive Publication Date: 2012-10-31
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the deficiencies of the existing packers, such as lax interlayer isolation, difficulty in unsealing, and inability to realize subdivided layer fracturing technology

Method used

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  • Separate layer fracturing packer

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Embodiment Construction

[0008] As shown in the drawings, a layered fracturing packer includes an upper joint 1, a central cylinder 4, and a lower joint 7; the upper joint 1, the central cylinder 4, and the lower joint 7 are connected in sequence; Cylinder 3 and setting mechanism 5 are sequentially set on the central cylinder 4 from top to bottom. The unsealing mechanism 2 and the central cylinder 4 are connected by slideways and fixed by shear nails. The setting mechanism 5 includes a hydraulic cylinder, and the hydraulic cylinder A locking mechanism 6 is installed between the lower joint 7 .

[0009] The present invention is connected with the completion pipe string through the tubing buckle of the upper joint 1 and the lower joint 7 . When the pressure in the pipe string exceeds the setting start pressure, the hydraulic cylinder compresses the rubber tube 3 to realize the setting, and at the same time, the locking mechanism 6 realizes synchronous locking of the setting state; when the unsealing ope...

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Abstract

The invention relates to the technical field of separate mini-layer fracturing of vertical wells and directional wells for oil and gas field development, in particular to a separate layer fracturing packer. An upper joint, a center cylinder and a lower joint of the separate layer fracturing packer are sequentially connected, an unsetting mechanism, a packing element and a setting mechanism are sequentially sheathed on the center cylinder from top to bottom, the unsetting mechanism and the center cylinder are connected with each other through a slideway and fixed through a shear pin, the setting mechanism comprises a hydraulic cylinder, and a locking mechanism is mounted between the hydraulic cylinder and the lower joint. The separate layer fracturing packer disclosed by the invention has the advantages of great packing and sealing intensity, stable performances and easiness in unsetting, and can meet the requirements of a separate mini-layer fracturing process. The separate layer fracturing packer can overcome the deficiencies of non-tight packing, difficulty in unsetting and incapability of realizing the separate mini-layer fracturing process of the existing packer.

Description

Technical field: [0001] The invention relates to the technical field of subdivided layer fracturing for vertical wells and directional wells in oil and gas field development, in particular to a layered fracturing packer. Background technique: [0002] For the realization of the existing vertical well layered fracturing technology, K344 and Y241 packers are mainly used to form the layered fracturing process string. The K344 packer is generally not tightly sealed between layers, the sliding sleeve throttles and the Y241 packer Difficulty in unblocking and other issues resulted in unsatisfactory layered fracturing effects, and it was also impossible to realize the subdivided layer fracturing process. Invention content: [0003] The technical problem to be solved by the present invention is to provide a layered fracturing packer, which has high packing and sealing strength, stable performance, easy unsealing, and meets the technical requirements of subdivided layer fracturing....

Claims

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Application Information

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IPC IPC(8): E21B33/12
Inventor 李永革唐勇于开斌李志龙朱正喜赵丽琴赵振东郭琳曹忠林张艳玲曹会杨冠科陶辉王超吴庭葛继伟张晓锋王源陈萍
Owner CNPC GREATWALL DRILLING ENG
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