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Controllable full-degradable bridge plug

A fully degradable and bridge plug technology, applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve problems such as limited adaptability, wellbore formation temperature and properties of fracturing flowback fluid

Active Publication Date: 2021-11-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the prior art bridge plug will be affected by the temperature of the wellbore formation and the properties of the fracturing flowback fluid and its adaptability is limited when it dissolves, the present invention provides a controllable fully degradable bridge plug

Method used

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Embodiment Construction

[0057]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work all belong to the protection scope of the present invention .

[0058] figure 1 It is a schematic structural diagram of the controllable fully degradable bridge plug provided by the embodiment of the present invention, figure 2 yes figure 1 A schematic cross-sectional view along the A-A direction in , image 3 It is a schematic structural diagram of the connection between the controllable fully degradable...

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Abstract

The invention provides a controllable full-degradable bridge plug. The controllable full-degradable bridge plug comprises a bridge plug body and a setting sleeve arranged on the bridge plug body, a sealing rubber sleeve, an upper slip and a lower slip are arranged on the setting sleeve, the sealing rubber sleeve is located between the upper slip and the lower slip, the setting sleeve is used for extruding the sealing rubber sleeve before setting, so that the upper slip and the lower slip are fixed to the inner wall of an oil well sleeve, a reaction dissolving cavity is formed in the bridge plug body, chemical substances are arranged in the reaction dissolving cavity, an overflowing hole is formed in the bridge plug body, one end of the overflowing hole communicates with the reaction dissolving cavity, the other end of the overflowing hole is located between two sealing rings arranged on the bridge plug body before setting, and the other end of the overflowing hole communicates with a drainage groove formed in the inner end of the setting sleeve after setting, so that liquid in a shaft enters the reaction dissolving cavity through the drainage groove and the overflowing hole to react with the chemical substances, and heat is generated. The controllable full-degradable bridge plug solves the problems that an existing bridge plug is influenced by the shaft formation temperature and the fracturing flow-back fluid property when being dissolved and the adaptability is limited.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a controllable fully degradable bridge plug. Background technique [0002] Fracturing technology is an important way to transform low-permeability oil and gas reservoirs and realize beneficial development. Multi-layer and staged fracturing technology can realize vertical and qualitative wells for vertical and qualitative wells to improve oil well production. Among them, bridge plug multi-stage The fracturing process is widely used in layered fracturing of oil and gas wells due to its less construction procedures, short cycle and accurate sealing position. Specifically, the bridge plug is lowered to the predetermined position through the cable + pumping process, and then the setting tool Set the bridge plug and perform fracturing on the target layer after the setting is completed. After the fracturing of the target layer is completed, the bridge plug needs to be drilled o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/134
CPCE21B33/134
Inventor 张鹏马帅帮方志刚李云涛李南星赵烁
Owner PETROCHINA CO LTD
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