Production increasing method of coalbed gas

A technology of coalbed methane and horizontal section, which is applied in earth-moving drilling, mining fluids, drilling equipment, etc., can solve problems such as wellbore collapse, coal seam collapse, coal seam collapse, etc., and achieve the effect of increasing gas production.

Inactive Publication Date: 2011-03-30
BEIJING ORION ENERGY TECH DEV
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Problems solved by technology

[0006] However, due to the instability of the coal seam structure, if a branch wellbore is drilled in the wellbore in the horizontal section, during the drilling of the branch wellbore or in the subsequent CBM extraction process, the horizontal section wellbore may appear Collapse, so that the wellbore in the horizontal section is blocked, thereby affecting the production of coalbed methane
[0007] In addition, if the stimulation plan of fracturing is adopted in the wellbore of the horizontal section, due to the loose geological structure of the coal seam, the coal seam is

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] In the actual construction process, in order to solve the problem that the collapse of the horizontal section in the horizontal well completed by the open hole will block the wellbore, the embodiment of the present invention provides a method for increasing the production of coalbed methane, such as figure 1 shown, including steps:

[0036] S11. When drilling the horizontal section wellbore of the horizontal well, control the horizontal section wellbore as a...

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Abstract

The embodiment of the invention discloses a production increasing method of coalbed gas, comprising the following steps of: controlling a horizontal-section well bore to be a non-bifurcation well bore and to communicate with a distal vertical well under the condition that the overall angle change rate of the horizontal-section well bore trace is within 10 degrees/30m when drilling the horizontal section of the well bore; mounting a horizontal-section completion casing along a second-spudding casing after the horizontal-section well bore is finished; after the mounting of the horizontal-section completion casing is finished, hydraulically spraying on the wall of the horizontal casing to drill branch well bores, or carrying out the sectional compression fracture on the wall of the horizontal casing. In the embodiment of the invention, because the horizontal section is provided with the casing, a well wall support can be formed, and the well bore is not easy to be blocked due to carrying out various production increasing processes when the horizontal-section well bore is collapsed; in addition, the embodiment of the invention further can achieve the re-mounting and circular cleaning of the horizontal well bore so as to effectively increase the gas production rate of the coalbed gas well.

Description

technical field [0001] The invention relates to the field of coal bed gas exploitation, and more specifically relates to a method for increasing production of coal bed gas. Background technique [0002] The exploitation of coalbed methane has successively gone through vertical well mode, horizontal well mode and multi-branch horizontal well mode. Its purpose is to increase the leakage area of ​​the reservoir; the completion methods of CBM wells include cave completion and fracturing completion, which are often used in vertical wells, in addition to open hole completion for horizontal wells. The purpose is to increase the pores of the reservoir to increase the seepage capacity of the reservoir, so as to achieve the purpose of mining or increasing production capacity. [0003] Open hole completion means that after a well is drilled, no casing is run in to seal and isolate the well, and the well is directly completed and enters the drainage process. [0004] Fracturing refers...

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Application Information

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IPC IPC(8): E21B43/25E21B43/26E21B43/30E21B17/00E21B21/00
Inventor 商昌盛刘利德吴华强徐正明夏雪平范龙江
Owner BEIJING ORION ENERGY TECH DEV
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