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
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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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