Dynamic pressure regulating method of coal-bed gas well drainage and mining shaft and related device
A coalbed methane well and dynamic pressure regulation technology, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and mining, etc., can solve the problems of low efficiency coalbed methane wells such as poor production and production increase effects, achieve deep desorption and desorption capacity improvement, Solve the effect of poor effect and avoid the effect of excessive pressure drop
Pending Publication Date: 2022-06-24
CHINA UNITED COALBED METHANE +2
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Problems solved by technology
[0005] In order to solve the above technical problems, this application provides a dynamic pressure regulation method and related devices for coalbed methane well drainage wellbore, so as to solve the problem that the effect of increasing production and increasing production of low-efficiency coalbed methane wells is poor
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[0051] As mentioned in the background art, the prior art has a poor effect of increasing production for low-efficiency coalbed methane wells.
[0052] In order to solve this problem, the inventors found out that how to further expand the pressure drop funnel for low-efficiency coalbed methane wells and the deep desorption of the coal seam in the pressure drop funnel is the key. Its solution can realize the further expansion of the pressure drop funnel and the deep desorption of the coal seam in the pressure drop funnel by further reducing the bottom hole flow pressure. In order to further reduce the bottom-hole flow pressure, increase the production pressure difference, and improve the desorption capacity, the commonly used method of increasing production is negative pressure drainage and production. The bottom hole flow pressure is reduced, so as to achieve the purpose of increasing the production of the gas well.
[0053]Negative pressure drainage is to directly reduce the ...
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The invention discloses a dynamic pressure regulating method of a coal-bed gas well drainage and production shaft and a related device.According to the dynamic pressure regulating method of the coal-bed gas well drainage and production shaft, the bottom hole flowing pressure is reduced on the basis of a negative pressure drainage and production mode, so that further expansion of a pressure drop funnel, deep desorption of a coal seam in the pressure drop funnel and improvement of the desorption capacity are achieved; and the yield of the coal-bed gas well is increased. Meanwhile, according to the dynamic pressure regulating method of the coal-bed gas well drainage and mining shaft, when the coal-bed gas well is depressurized, the bottom hole pressure of the drainage and mining shaft is dynamically changed into the bottom hole target pressure according to the target pressure drop mode, the problems that pressure drop is too fast, drainage and mining intensity is too large and the like are solved, and the problem that the yield increasing and increasing effect of the low-efficiency coal-bed gas well is poor is effectively solved.
Description
technical field [0001] The present application relates to the technical field of mining, and more particularly, to a dynamic pressure regulation method and related device for a coalbed methane well drainage and production wellbore. Background technique [0002] Coalbed methane is a gas resource associated with and symbiotic with coal, which refers to the hydrocarbon gas stored in the coalbed. CBM mainly exists in the coal seam in an adsorbed state. When the pressure in the CBM reservoir decreases to the critical desorption pressure, the adsorbed methane molecules become free gas. In this process, the method of drainage and pressure reduction is often used, and the pressure at the bottom of the well is reduced by drainage to form a pressure drop funnel with the wellbore as the center, and the coalbed methane is desorbed within the pressure range to form production capacity. [0003] Because the pressure drop funnel formed by the current CBM development cannot be effectively ...
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IPC IPC(8): E21B43/00E21B43/12
CPCE21B43/006E21B43/12
Inventor 李忠城琚宜文张芬娜胡秋萍张浩亮张亚飞綦耀光王小明王凡李午阳
Owner CHINA UNITED COALBED METHANE