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Well cementation method suitable for shale gas well refracturing

A technology for repeated fracturing and shale gas wells, which is applied in wellbore/well components, earthwork drilling and production, drilling equipment, etc. It can solve the problems of high leakage risk, difficult casing centering, and difficult casing running, etc., to achieve guarantee Plugging effect, ensuring construction steps, and reducing friction

Active Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a shale gas well refracturing and cementing method to solve the problem of cementing in the casing-in-casing refracturing technology. , the casing is difficult to run in, the risk of leakage is high, and the casing is not easy to center

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  • Well cementation method suitable for shale gas well refracturing
  • Well cementation method suitable for shale gas well refracturing
  • Well cementation method suitable for shale gas well refracturing

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Embodiment 1

[0046] A method suitable for repeated fracturing and cementing of shale gas wells, such as figure 1 shown, including the following steps:

[0047] (1) For the construction of the original wellbore treatment, the original wellbore shall be drilled with the drilling tool. The stiffness of the drilling tool assembly shall be greater than that of the casing, and the outer diameter of the drilling tool shall not be less than 112mm; Short-range tripping and reaming are performed in the blockage and stuck sections of the drilling to ensure the smoothness of the wellbore; then reinject 2% potassium chloride solution into the original wellbore to reduce the formation loss to 12m 3 / h, so that there is an outlet for the workover operation cycle to ensure the safety of the well control; at the same time, the bottom hole pressure is raised to above 22MPa, so that the plugging agent can form a support in the near wellbore area to ensure the plugging effect; the workover rig simulates solid...

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Abstract

The invention belongs to the technical field of shale gas exploitation, and particularly discloses a well cementation method suitable for shale gas well refracturing. The well cementation method comprises the following steps that (1) original shaft treatment construction is conducted; (2) a centralizer is mounted; (3) a small-size casing pipe is put in; (4) leaking stoppage construction is conducted; (5) well cementation cement injection construction is conducted; (6) a disjointer is released; and (7) the well cementation quality is detected. Compared with the prior art, the method has the advantage that the problems that in the casing-in-casing-fixation refracturing technology, the small-size casing pipe is difficult to put in, the leakage risk is large, and the small-size casing pipe is not prone to centering during well cementation can be solved.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation, and specifically discloses a method suitable for repeated fracturing and cementing of shale gas wells. Background technique [0002] my country has set up national shale gas demonstration zones in Fuling, Changning-Weiyuan, Zhaotong and other areas, and successively realized the commercial development of shale gas. As the development and production time increases, the production of some old shale gas wells declines seriously. The pressure is close to the output pressure. [0003] Usually, the original wellbore includes a vertical well section perpendicular to the ground, a cavitation well section inclined to the ground, and a horizontal well section parallel to the ground from top to bottom. The wellbore is usually cemented with a 5.5-inch casing. After cementing, staged perforation and fracturing are carried out to form multiple fractures and effectively increase the fracture netw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/10E21B33/13E21B17/10E21B47/005
CPCE21B43/10E21B33/13E21B17/1078
Inventor 胡德高刘尧文沈金才李远照张驰韦琦赵昆李奎东肖佳林豆瑞杰秦文斌明月夏绪波周彤崔静刘星戴梦宇彭冲
Owner CHINA PETROLEUM & CHEM CORP
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