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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 achieved the total number of branches and coal seam footage targets, a large proportion of multi-lateral horizontal wells were in the Gas production is very low during drainage

Method used

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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

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Embodiment

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

[0096] (1) Determine the target position according to the drainage convenience target and set the trajectory of the CBM multi-branch horizontal well.

[0097] Optimization of coal seam occurrence and horizontal section trajectory azimuth: The coal seam in this well area has an inclination angle of 3° and a dip of 222°. According to the goal of facilitating drainage and production, the horizontal section trajectory azimuth of Well B is adjusted to be 42° north by east, and the inclination angle is 93° , see Figure 6 .

[0098] Optimize the trajectory of Well B according to the water content characteristics of the coal seam and roof and floor at the target location: use acoustic wave, de...

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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...

Claims

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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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