A method for determining the contribution of adsorbed gas and free gas production in shale gas wells
A technology for shale gas wells and free gas, which is used in earth-moving drilling, wellbore/well components, design optimization/simulation, etc. It can solve the problem of difficulty in estimating adsorbed gas and free gas, and achieve high practical value and promotion value. , The effect of the method and process is simple
Active Publication Date: 2021-06-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, current methods are difficult to estimate how much adsorbed gas and free gas are produced during shale gas production.
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[0070] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so that implementers of the present invention can fully understand how the present invention uses technical means to solve technical problems, and achieve the realization process of technical effects and according to the above-mentioned realization process The present invention is implemented concretely. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0071] Shale gas is an unconventional natural gas that occurs in organic-rich shale and its interlayers, mainly in adsorption and free states, and is mainly composed of methane. Shale gas is often distributed in thicker and widely distributed shale source rock formations i...
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The invention discloses a method for determining the contribution of adsorbed gas and free gas output in shale gas wells. The method includes: establishing a shale formation adsorbed gas and free gas output model based on formation pressure distribution, wherein the formation is assumed to be a rectangle Close the boundary, assuming that the shale gas well is a multi-stage fractured horizontal well, establish the calculation model of adsorbed gas, matrix free gas and fracture free gas; obtain actual logging and production data, and calculate according to the actual logging and production data Formation pressure distribution data: Substituting the formation pressure distribution data into the shale formation adsorbed gas and free gas output model to calculate the shale formation adsorbed gas and free gas output. According to the method of the invention, the amount of adsorbed gas and free gas produced in the shale gas production process can be obtained; the method of the invention has a simple process and has high practical value and popularization value.
Description
technical field [0001] The invention relates to the field of geological exploration and development, in particular to a method for determining the output contribution of adsorbed gas and free gas in shale gas wells. Background technique [0002] Shale gas is an unconventional natural gas that occurs in organic-rich shale and its interlayers, mainly in adsorption and free states, and is mainly composed of methane. Shale gas is often distributed in thicker and widely distributed shale source rock formations in the basin. Different from conventional reservoir gas reservoirs, shale is not only the source rock for natural gas generation, but also the reservoir and caprock for accumulating and preserving natural gas. Therefore, black shale and high-carbon mudstone with high organic matter content are often the best shale gas developmental conditions. Due to the low permeability of shale gas reservoirs, it is difficult to exploit them, and horizontal well drilling and multi-stage...
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IPC IPC(8): G06F30/20E21B49/00
CPCE21B49/00G06F30/20
Inventor 庞伟吴琼杜娟张同义毛军邸德家艾爽
Owner CHINA PETROLEUM & CHEM CORP