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Active water flooding method for exploiting coalbed methane

A technology for active water flooding and coalbed methane, which is applied in the fields of fluid extraction, 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 processes, and difficult construction. Achieve the effect of solving the problem of water treatment in coalbed methane wells, saving project investment and facilitating construction operations

Active Publication Date: 2017-11-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • 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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  • Active water flooding method for exploiting coalbed methane
  • Active water flooding method for exploiting coalbed methane
  • Active water flooding method for exploiting coalbed methane

Examples

Experimental program
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Effect test

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 and gas field development engineering, and in particular relates to a method for exploiting low-permeability coalbed methane by active water displacement. This method selects the measure well group, determines the central injection well, and centrally treats the produced water of the coal seam through the skid-mounted sewage treatment device, and mixes a certain proportion of the produced water of the coal seam after treatment into the skid-mounted water injection. The active water system is synthesized in the device, and then the synthesized active water system is injected into the central injection well through the skid-mounted water injection device, and the adjacent coalbed methane production wells are drained for gas recovery until the active water components are monitored in the coalbed methane production wells , the center transfer injection well shuts down the boring well, and turns it into a coalbed methane production well to continue drainage. The invention changes the wettability of coal and rock, reduces the interfacial tension of gas and liquid, accelerates the migration and output of coal bed gas, improves the recovery rate of coal bed gas reservoirs, effectively solves the problem of coal seam production water treatment, and realizes the double efficiency of production increase and environmental protection.

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 Patents(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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