A method for predicting the variable time-space conductivity of fractured fractures in coalbed methane wells

A technology for conductivity and coalbed methane wells, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the problems of loss of fracture conductivity, reduce fracture porosity and permeability, etc., and achieve accurate conductivity. The effect of failure time

Active Publication Date: 2022-04-05
CHINA UNITED COALBED METHANE +2
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Problems solved by technology

After coal rock fracturing, as the production process proceeds, coal powder will also gradually deposit in the proppant filling layer, and block the fractures, reducing the porosity and permeability of the fractures, resulting in the loss of fracture conductivity

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  • A method for predicting the variable time-space conductivity of fractured fractures in coalbed methane wells
  • A method for predicting the variable time-space conductivity of fractured fractures in coalbed methane wells
  • A method for predicting the variable time-space conductivity of fractured fractures in coalbed methane wells

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[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. The words "comprising" or "comprising" and similar words used in the present disclosure mean that the elements or things appearing be...

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Abstract

The invention discloses a method for predicting the variable time-space conductivity of coalbed methane well fracturing fractures, comprising the following steps: S1, collecting relevant parameters of the reservoir rock of the target coalbed gas well; The spatial distribution of capacity; S3. Establish the mechanism expression of the influence of pulverized coal deposition, proppant embedding and time on the conductivity of proppant-filled fractures; S4. According to the established conductivity change mechanism model, the calibrated spatially discretize the global diversion capacity to obtain the diversion capacity value of each discrete unit at different times; S5. Taking the calculation result of step S4 as the starting point, repeat steps S3-S4 until the calculation of the global diversion capacity is completed. The present invention overcomes the shortcomings of the existing laboratory experiments in predicting the conductivity, and after the fracturing of coalbed methane wells, the damage to the conductivity caused by coal powder deposition and proppant embedding is considered, and the time-varying space-time conductivity that can effectively predict the global proppant-filled fractures is achieved. flow capability.

Description

technical field [0001] The invention relates to the technical field of coalbed methane production enhancement and transformation, in particular to a method for predicting the variable time-space conductivity of fracturing fractures of coalbed methane wells. Background technique [0002] my country is rich in coalbed methane resources, the geological resources rank third in the world, and the prospect of development and utilization is broad. Due to its unique occurrence state and reservoir physical properties, establishing an effective fracture network through hydraulic fracturing is the key to the development of coalbed methane. However, in the mining practice of coalbed methane wells after fracturing, coal powder will settle and block the coal seam fracture system, which will significantly reduce the coal seam permeability, resulting in a significant decrease in water production and slow desorption of coalbed methane, which will seriously affect the formation of industrial ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B49/00G06F30/20
CPCE21B43/267E21B49/00
Inventor 李忠城李昀昀杨兆中张亚飞李宇熊俊雅张云鹏刘羽欣汪若璇杨晨曦
Owner CHINA UNITED COALBED METHANE
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