基于煤岩割理正交各向异性性质的低渗透煤层压力数值模拟研究  

Numerical Simulation of Pressure Distribution of Coal Seams Based on the Orthotropic Physical Properties of Coal Cleats

作　　者：王保辉[1,2] 闫相祯 

机构地区：[1]潍坊学院建筑工程学院,山东潍坊261061 [2]河南大学环境与规划学院,河南开封475004 [3]中国石油大学(华东)储运与土木工程学院,山东青岛266555

出　　处：《信阳师范学院学报（自然科学版）》2018年第1期135-139,共5页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家科技重大专项大型油气田及煤层气开发资助项目(2011ZX05036-001)

摘　　要：考虑煤岩面割理和端割理两个方向不同渗流性质,建立了低渗透性煤层气水固三相流固耦合模型,利用该模型分析了沁水盆地煤层气井在开采过程中压力及解吸半径变化规律,并对影响煤层压力的割理参数进行分析.计算结果表明:非耦合模型比耦合模型的解吸面积要大;随着煤岩割理渗透率正交各向异性系数的增大,煤层面割理方向解吸半径逐渐增大,而煤层端割理方向解吸半径逐渐减小;面割理方向,随着割理渗透率正交各向异性系数和割理宽度的增大,煤层压力先增加后降低;端割理方向,煤层压力随着渗透率正交各向异性系数、割理密度和割理宽度的增大而增大.The coupling model of three-phase of gas- water-solid for coal seams was established on the basis of the orthotropic physical properties of coal cleats and different seepage characteristics in the orientation of the face and butt cleats.The comparison between the calculated results based on the coupling model and the uncoupling model indicated their good agreement,which verified the accuracy and rationality of the model. By using the coupling model,the distri-bution of pressure and desorption radius were obtained and the effect of physical parameters of coal cleats on pressure was analyzed. The results showed that the desorption area of the non-coupling model was larger than that of the cou-pling model. The desorption radius along the face cleats direction increases with permeability orthotropic coefficient in- creasing, whereas it decreases along the butt cleats direction. The pressure along the face cleats direction increases first and then decreases with permeability orthotropic coefficient and cleat width increasing, and increases with permeability orthotropic coefficient, cleat density and cleat width increasing.

关 键 词：煤岩割理 正交各向异性 耦合模型 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]