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Chemical unpacking compression packer partial pressure string and oil well fracturing method

A compression packer and pressure divider technology, applied in sealing/packing, earth-moving drilling, wellbore/well components, etc., can solve the problems of difficult to unpack the fracturing packer and difficult to take out the pipe string.

Active Publication Date: 2019-03-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems in the prior art that the fracturing packer is difficult to unseal and the pipe string is difficult to take out, the purpose of the present invention is to provide a chemical unseal compression packer pressure dividing string and oil well fracturing method

Method used

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  • Chemical unpacking compression packer partial pressure string and oil well fracturing method
  • Chemical unpacking compression packer partial pressure string and oil well fracturing method
  • Chemical unpacking compression packer partial pressure string and oil well fracturing method

Examples

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Embodiment

[0105] This embodiment provides a chemical unpacking compression packer pressure dividing string, such as figure 1 As shown, the pressure dividing string of the chemically unpacked compression packer includes a first chemically unpacked compression fracturing packer 104, a first ball-throwing sandblasting sliding sleeve 105, a second chemically unpacked compression fracturing packer Spacer 106, second pitching sandblasting sliding sleeve 107, chemical unsealing compression slip fracturing packer 108, differential pressure sandblasting sliding sleeve 103, safety joint 109, ball seat 102 and plug 101;

[0106] Plug 101, ball seat 102, differential pressure sandblasting sliding sleeve 103, first chemically unsealed compression fracturing packer 104, first pitching sandblasting sliding sleeve 105, second chemically unsealed compression fracturing packer The spacer 106, the second ball-dropping sandblasting sliding sleeve 107, the chemical desealing compression slip fracturing pack...

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Abstract

The invention provides a pressure-dividing tubular column for a chemical de-blocking compression packer and a well fracturing method. The pressure-dividing tubular column for the chemical de-blocking compression packer comprises a plug, a ball base, a differential pressure type sand blasting slide sleeve, at least two identical chemical de-blocking compression fracture packers and matched pitching sand blasting slide sleeves, chemical de-blocking compression slip fracture packers and safety joints which are fixedly connected with each other in turn. The chemical de-blocking compression fracture packers and the chemical de-blocking compression slip fracture packers are connected with each other, so that the pressure-dividing tubular column for the chemical de-blocking compression packer provided by the invention has the characteristics of simple structure and convenience in mounting and construction operation; the two chemical de-blocking packers both can automatically de-block and are free from de-blocking load; after the fracturing is completed, the rubber sleeves of the packers are dissolved or completely released; the sand setting on the upper parts of the rubber sleeves is reduced; the taking safety of the tubular column is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of gas well fracturing in oil fields, and relates to a chemical unpacking compression packer pressure dividing pipe string and an oil well fracturing method. Background technique [0002] Staged fracturing with packer in casing is one of the important technologies to realize the effective production of low-permeability and tight oil and gas reservoirs. It has the characteristics of highly targeted fracturing intervals and continuous fracturing process. Especially for refracturing of old wells, segmental modification of the packer in the casing is the only technical means. [0003] The packer in the casing is used for staged fracturing. The packer is the core of this technology, and it must meet the basic requirements of sealing and lifting. There are two main types of fracturing packers, one is expansion packer and the other is compression packer. At present, there are few domestic and foreign casing inner...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/122E21B34/14
CPCE21B33/122E21B34/14E21B43/26
Inventor 钱杰沈泽俊黄鹏薛建军张国文张卫平廖成龙
Owner PETROCHINA CO LTD
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