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Hydraulically controlled self-unsealing staged fracturing string

A staged fracturing and hydraulic control technology, which is applied in the field of oil fracturing, can solve problems such as easy puncture, difficulty in pulling out pipe strings, and construction accidents, so as to improve safety, reduce the risk of sand stuck, and eliminate construction The effect of displacement restrictions

Active Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hydraulically controlled self-unsealing segmented fracturing string, which solves the current problems that the string is difficult to pull out or is easily broken, causing construction accidents, etc., and improves the safety of the segmental fracturing process in the casing reliability

Method used

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  • Hydraulically controlled self-unsealing staged fracturing string
  • Hydraulically controlled self-unsealing staged fracturing string

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Embodiment 2

[0022] Embodiment 2: On the basis of Embodiment 1, the upper and lower ends of the combined rubber cylinder are respectively provided with an upper blocking cap 5-5 and a lower blocking cap 5-7, and the outer wall of the sand blasting is also provided with a sand blocking leather bowl 5- 4. The sand blocking cup is located at the upper end of the upper blocking cap at the upper end of the combined rubber cylinder. The upper end of the lock sleeve is connected to the lower blocking cap, the upper end of the clasp seat is fixed on the sandblasting body and a locking pin 5-8 is installed between the two. A sealing ring is provided between the sliding sleeve and the sandblasting body, a sealing ring is provided between the unsealing piston and the sandblasting body, a sealing ring is provided between the upper piston, the sandblasting body and the lower center pipe, and the lower piston and A sealing ring is arranged between the lower center pipe and the lower joint.

[0023] The...

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Abstract

The invention discloses a hydraulically controlled self-deblocking staged fracturing string. The hydraulically controlled self-deblocking staged fracturing string comprises an anchor, a Y341 packer, hydraulically controlled self-deblocking abrasive blasting fracturing packers and a setting start valve which are sequentially connected from top to bottom. At least two hydraulically controlled self-deblocking abrasive blasting fracturing packers are arranged and can be connected with an oil pipe or oil pipe pup joint. The upper end of the anchor is connected with the oil pipe through a safety joint. The problems that at present, a string is difficult to pull out or easy to break causing construction accidents are solved, and safety and reliability of the staged fracturing process in a casing pipe are improved.

Description

technical field [0001] The invention relates to petroleum fracturing technology, in particular to a hydraulically controlled self-unsealing type staged fracturing string. Background technique [0002] In-pipe mechanical stratification and staged fracturing technology is one of the important means for the effective production of low-permeability and thin interlayer reservoirs, and its application scale is gradually expanding. Drainage area, improved oil displacement efficiency, timely flowback, effective reservoir protection and other technical advantages, can be applied to vertical wells, directional wells, and horizontal wells. [0003] At present, there are mainly three kinds of casing packer staged fracturing string combinations at home and abroad that can be retrieved at home and abroad: the string composed of compression packer and other supporting tools, compression packer plus expansion packer and other supporting tools. A pipe string composed of tools, a pipe string...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/126E21B34/14
Inventor 吕芳蕾叶金胜李敢李玉宝张峰高恒超闫丽丽田浩然周景彩魏剑飞张建任家敏
Owner CHINA PETROLEUM & CHEM CORP