Waste well plugging method

A technology for plugging balls and well killing fluids, which is applied in the field of oil and gas field exploration and development, can solve the problems of low plugging success rate, coal seam deficit, low technological level, etc., and achieves the improvement of plugging quality and plugging success rate, and the operation process is simple. Effect

Pending Publication Date: 2022-07-08
PETROCHINA CO LTD +1
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Problems solved by technology

[0003] However, abandoned coalbed methane wells are different from conventional oil and gas abandoned wells, and have the following characteristics: (1) The main reason for abandoned coalbed methane wells is the low level of technology, mainly due to temporary closure of wells; The pressure is low, and the coal seam deficit is serious; (3) There is a fracturing process in all coalbed methane wells, and a large number of fractures are likely to cause plugging and leakage
[0004] Therefore, the plugging technology of conventional oil and gas abandoned wells has poor applicability for abandoned coalbed methane wells, and the plugging success rate is low

Method used

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Embodiment Construction

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] The embodiments of the present application provide a method for plugging abandoned wells, which can be applied to both conventional oil and gas abandoned wells and coalbed methane abandoned wells, and has wider applicability.

[0055] like figure 1 As shown, the method for plugging an abandoned well provided by the embodiment of the present application includes the following steps:

[0056] Step 101, dropping an ash injection p...

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Abstract

The invention discloses an abandoned well plugging method. The method comprises the following steps that a cement injection pipe column is put into a target abandoned well; well killing fluid is injected into the cement injection pipe column, a plugging ball is put in, and the plugging ball is used for plugging a perforation hole of the target abandoned well; and after all the perforation holes are plugged by the plugging ball, cement paste is injected into the cement injection pipe column, and the target abandoned well is plugged. According to the abandoned well plugging method, the plugging quality and the plugging success rate of the abandoned well can be improved.

Description

technical field [0001] The present application relates to the technical field of oil and gas field exploration and development, in particular to a method for plugging abandoned wells. Background technique [0002] Abandoned wells are an inevitable product in the process of oil and gas exploration and development. If the disposal of abandoned wells is not perfect, there will be risks such as blowout out of control accidents, oil and gas leakage, and water source pollution. At present, the United States and Canada have put forward relevant regulatory requirements for the plugging of abandoned oil and gas wells, and China has also promulgated the "Guidelines for the Disposal of Abandoned Wells and Long-term Stopped Wells" (SY / T6646-2006) and the "Code for Disposal of Abandoned Wells for Closure and Well Disposal" (Q / SH 0653-2015), which proposes plugging standards for abandoned oil and gas wells. [0003] However, CBM abandonment wells are different from conventional oil and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 王渊王辰龙任文军王凤清王泽斌李彦飞
Owner PETROCHINA CO LTD
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