Optimization method for coal bed gas multi-branch horizontal well trajectory

A trajectory optimization, multi-branch technology, applied in earth-moving drilling, wellbore/well components, production fluid, etc., can solve the problems of not considering convenience and low gas production

Inactive Publication Date: 2015-03-25
CHINA UNITED COALBED METHANE
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Problems solved by technology

Little or no consideration was given to the convenience of drainage in the later stage and whether the drainage can achieve high production. As a result, although the drilling

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  • Optimization method for coal bed gas multi-branch horizontal well trajectory
  • Optimization method for coal bed gas multi-branch horizontal well trajectory
  • Optimization method for coal bed gas multi-branch horizontal well trajectory

Examples

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[0094] Example

[0095] Among them, the trajectory of the A coalbed methane multi-branch horizontal well (hereinafter referred to as Well A) is not optimized by the above-mentioned method; the trajectory of the B coalbed methane multi-branch horizontal well (hereinafter referred to as the B well) is optimized by the above method.

[0096] (1) Determine the target location and set up the trajectory of multi-branch horizontal wells for coalbed methane according to the target of convenient drainage and production.

[0097] Optimization of coal seam occurrence and horizontal section trajectory: the inclination angle of the coal seam in this well area is 3°, and the inclination is 222°. Adjust the horizontal section trajectory azimuth of Well B to 42°east by north and the inclination angle of 93° , See Image 6 .

[0098] Optimize the well B trajectory according to the water content characteristics of the coal seam and the roof and floor at the target location: use sonic, density, neutron,...

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Abstract

The embodiment of the invention discloses an optimization method for a coal bed gas multi-branch horizontal well trajectory. The optimization method for the coal bed gas multi-branch horizontal well trajectory includes the steps that (1) the coal bed gas multi-branch horizontal well trajectory is set according to the discharge and mining convenience target determined target location; (2) the coal bed gas multi-branch horizontal well trajectory is set according to the safety target determined target location; (3) the coal bed gas multi-branch horizontal well trajectory is set according to the high-yield target determined target location. According to the scheme, the coal bed gas multi-branch horizontal well trajectory is optimized by meeting the requirements for geology, drilling and completion, discharge and mining and the like, so that by adoption of the scheme, the requirements for discharge and mining convenience, safety and high yield are met.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploitation, and more specifically relates to a trajectory optimization method for multi-branched horizontal wells of coalbed methane. Background technique [0002] There are three main modes of surface mining of coalbed methane: vertical well drilling, multi-branch horizontal well drilling and U-shape horizontal well drilling. Multi-branch horizontal well mining of CBM has a high gas production rate and is the main way to develop CBM efficiently. However, it faces many geological and engineering risks, which are mainly divided into the following categories: (1) Analysis of pressure reduction due to excessive water production during drainage During gas production or drainage, it is difficult to discharge wellbore water smoothly, which also leads to difficulties in analyzing gas production; (2) The coal seam strength is low during drilling, and cleats and cracks are developed, which is pro...

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Application Information

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IPC IPC(8): E21B43/30
CPCE21B43/305
Inventor 孟尚志郭本广莫日和赵军王楚峰张文忠刘一楠
Owner CHINA UNITED COALBED METHANE
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