Method for exploiting coalbed methane by adopting active water displacement

A technology of active water flooding and coalbed methane, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., and can solve the problems of inability to use coalbed methane for large-scale commercial development, complicated production stimulation process, and difficult construction. Achieve the effects of solving the problem of coalbed methane well produced water treatment, saving engineering investment, and facilitating construction operations

Active Publication Date: 2016-03-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The stimulation process proposed by the above-mentioned existing methods is complex, involving various complex technologies such as cave completion, horizontal well drilling, remote inter-well docking (needle penetration), automatic heating and reinjection, etc. CBM cannot be used for large-scale commercial development of coalbed methane

Method used

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  • Method for exploiting coalbed methane by adopting active water displacement
  • Method for exploiting coalbed methane by adopting active water displacement
  • Method for exploiting coalbed methane by adopting active water displacement

Examples

Experimental program
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Embodiment 1

[0027] Such as figure 1 , figure 2 , image 3 As shown, the active water displacement method for exploiting low-permeability coalbed methane includes the following steps:

[0028] S1: According to the development data of coalbed methane blocks, the selected well pattern is relatively regular, the drainage time is more than 3 years, and the average daily water production of a single well is less than 10m 3 1. Rectangular well pattern units with no gas seen in central coalbed methane wells or whose daily gas production is lower than economic daily gas production are used as measure well groups;

[0029] For such as figure 1 For the CBM rectangular well pattern shown, a rectangular well pattern unit 1 consisting of a unit central well 3 and 8 coalbed methane production wells adjacent to the unit central well 3 is selected (such as figure 2 ), implementing transfer injection displacement mining;

[0030] S2: Replace the water injection wellhead device 9 on the unit center w...

Embodiment 2

[0038] Such as Figure 4 , Figure 5 , Figure 6 As shown, the active water displacement method for exploiting low-permeability coalbed methane includes the following steps:

[0039] S1: According to the development data of coalbed methane blocks, the selected well pattern is relatively regular, the drainage time is more than 3 years, and the average daily water production of a single well is less than 10m 3 , The central coalbed methane well has no gas or the diamond-shaped well pattern unit whose daily gas production is lower than the economic daily gas production is used as the measure well group;

[0040] For such as image 3 In the diamond-shaped CBM well pattern shown, the diamond-shaped well pattern unit 2 composed of the unit center well 3 and 6 coalbed methane production wells adjacent to the unit center well 3 is selected (such as Figure 4), implementing injection displacement mining;

[0041] S2: Replace the water injection wellhead device 9 on the unit center...

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Abstract

The invention belongs to the field of oil-gas field development engineering and particularly relates to a method for exploiting low-permeability coalbed methane by adopting active water displacement. According to the method, a measure well group is selected, a central conversion well is determined, a coalbed produced water is subjected to centralized treatment through a skid-mounted sewage treatment device, part of treated coalbed produced water is doped with a fluorocarbon surfactant in certain proportion, the mixture is injected into the skid-mounted sewage treatment device, an active water system is synthesized and injected into the central conversion well through the skid-mounted sewage treatment, drainage gas exploitation is performed on adjacent coalbed methane production wells, the central conversion well is shut in and closed after active water ingredients are monitored by the coalbed methane production wells, and the coalbed methane production wells continue drainage exploitation. According to the method, coalbed methane migration and production are accelerated and the coalbed methane reservoir recovery efficiency is improved through change of the wettability of coal and reduction of the tension of a gas-liquid interface; the problem about treatment of the coalbed produced water is solved effectively, and double effects of yield increase and environmental protection are realized.

Description

technical field [0001] The invention belongs to the field of oil and gas field development engineering, and in particular relates to a method for exploiting low-permeability coalbed methane by active water displacement. Background technique [0002] The geology of my country's coal fields is relatively complex, and coal seams generally have the "three lows" unfavorable conditions of low permeability, low reservoir pressure and low gas saturation, and low-permeability coal reservoirs account for 69%. At present, the main problem facing my country's coalbed methane development is how to effectively and substantially increase the recovery of coalbed methane wells. At present, the commonly used measures to increase production of coalbed methane mainly include hydraulic fracturing, gas injection stimulation, feathered horizontal wells, heat injection and coal seam combustion and other technologies. [0003] Through retrieval, the document "Application of Water Injection Method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/34E21B43/40
CPCE21B43/006E21B43/16E21B43/34E21B43/40
Inventor 张先敏冯其红孙贝贝张纪远
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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