Method for calculating gas-water permeability of coal-bed methane in different production stages

A production stage, water infiltration technology, applied in computing, earthwork drilling, data processing applications, etc., can solve problems such as non-quantitative characterization

Pending Publication Date: 2020-04-10
PETROCHINA COALBED METHANE +1
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Problems solved by technology

However, previous studies have not comprehensively reported the key mechanism affecting the dynamic permeability of coal reservoirs, and have not carried o

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  • Method for calculating gas-water permeability of coal-bed methane in different production stages
  • Method for calculating gas-water permeability of coal-bed methane in different production stages
  • Method for calculating gas-water permeability of coal-bed methane in different production stages

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Embodiment Construction

[0084] Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood, and the scope of the present application can be fully conveyed to those skilled in the art.

[0085] The embodiment of the present invention discloses a method for calculating gas-water permeability in different production stages of coalbed methane, the method comprising:

[0086] According to different production stages, the production stage is divided into the following four stages: single-phase water flow stage, unsaturated single-phase flow stage near the wellbore zone, gas-water two-phase flow stage n...

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Abstract

The invention discloses a method for calculating gas-water permeability of coal-bed methane in different production stage. The method involves that according to different mining stages, the productionstage can be divided into the following four stages including a single-phase water flowing stage, a near-wellbore unsaturated single-phase flowing stage, a near-wellbore gas-water two-phase flowing stage and a single-phase gas flowing stage; and the permeability is calculated through combining a permeability-pressure empirical model according to restrictions of an effective stress effect, a coalmatrix shrinkage effect caused by gas desorption, a coal matrix shrinkage effect caused by hydrolysis desorption as well as a Klinkenberg effect on the permeability. According to the method, aiming atthe four production stages of a coal-bed gas well for the first time, a gas-water permeability calculation model which comprehensively considers the influence of "the four effects" in the coal-bed gas well drainage and recovery process is provided, and therefore the dynamic permeability of the coal-bed gas well can be predicted more accurately and quickly.

Description

technical field [0001] The application relates to the field of mining technology, in particular to a method for calculating gas-water permeability in different production stages of coalbed methane. Background technique [0002] Coalbed methane refers to 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. Coal reservoir permeability is a key parameter affecting the production of coalbed methane. In the actual coalbed methane mining process, it is found that with the increase of gas output and effective stress of coal seam, the permeability of reservoir coal rock decreases. Changes are complex. During the drainage process of coalbed methane wells, the physical properties of coal reservoirs are affected by many factors and are in a dynamic change. Scholars at home and abroad have done a lot ...

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Application Information

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IPC IPC(8): E21B49/00E21B43/00G06Q50/02
CPCE21B49/00E21B43/006G06Q50/02
Inventor 石军太苗亚楠张雷侯伟李相方巢海燕闫霞王倩张慧刘其虎
Owner PETROCHINA COALBED METHANE
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