A method for mining coalbed methane
A mining method and technology for coalbed methane, which are applied in the fields of mining fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of high cost of coalbed methane mining and limited scope of influence, so as to reduce mining costs, ensure production capacity, and increase The effect of high penetration
Active Publication Date: 2021-08-20
BEIJING ORION ENERGY TECH DEV +1
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Problems solved by technology
However, the wellbore trajectory of the horizontal well passes through a target layer, and the scope of influence is limited. Only the coalbed methane in the target layer can be exploited, and the coalbed methane resources in the adjacent layers cannot be produced, and another wellbore needs to be constructed , in order to effectively develop multi-layer reservoirs, resulting in high cost of CBM exploitation in multi-layer reservoirs
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[0023] The invention discloses a method for mining coal bed gas to reduce the cost of mining coal bed gas in multi-layer reservoirs.
[0024] 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 making creative efforts belong to the protection scope of the present invention.
[0025] see figure 1 and figure 2 , figure 1 A flow chart of the coalbed methane mining method provided by the embodiment of the present invention; figure 2 The three-dimensional projection diagram of the stereoscopic horizontal well provided by the embodiment of the present invention.
[0026] The invention discloses a co...
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The invention discloses a coalbed methane mining method, which can simultaneously open a plurality of adjacent reservoirs, realize the communication between a main wellbore and the horizontal section and branch well section of a plurality of reservoirs, and a plurality of adjacent reservoirs play a synergistic Effect, using the permeability enhancement effect of the upper reservoir to effectively increase the permeability of the lower reservoir and release the production capacity to the greatest extent. The coalbed methane mining method provided by this scheme not only guarantees production capacity, but also does not require additional construction of another wellbore, thereby reducing the cost of coalbed methane mining in multi-layer reservoirs to a certain extent.
Description
technical field [0001] The invention relates to the technical field of energy mining, in particular to a coal bed gas mining method. Background technique [0002] Coalbed methane refers to the hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partly free in coal pores or dissolved in coal seam water. It is an associated mineral resource of coal and belongs to unconventional natural gas. Coalbed methane is a clean and high-quality energy and chemical raw material that has risen internationally in the past ten or twenty years. [0003] Ground drilling for coalbed methane mining involves setting up a horizontal well from the ground. The horizontal section of the horizontal well enters the unmined coal seam. The coalbed methane in the coal seam is desorbed by means of drainage and pressure reduction. The desorbed coalbed methane flows to the ground through the wellbore. The horizontal well incr...
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IPC IPC(8): E21B43/00
CPCE21B43/006
Inventor 王国玲杨陆武郭卫东崔玉环严开峰史红玲
Owner BEIJING ORION ENERGY TECH DEV