具有越流补给的含水煤层渗流模型求解与典型曲线  

Solution and typical curves of seepage model of water-bearing coal seam with leakage recharge

作　　者：杨宇[1] 田慧君[1] 张昊[1] 孙晗森[2] 陈万钢[2] YANG Yu;TIAN Huijun;ZHANG Hao;SUN Hansen;CHEN Wangang(Energy College of Chengdu University of Technology, Chengdu 610059, China;China United Coalbed Methane Corporation, Beijing 100011, China)

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]中联煤层气有限责任公司,北京100011

出　　处：《煤田地质与勘探》2017年第1期95-99,共5页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2011ZX05060-002)~~

摘　　要：为了分析水层越流补给对煤层气井早期排水的影响,根据不稳定渗流理论,引入越流系数,建立了考虑层间越流现象的煤层中水的渗流数学模型。通过Laplace变换对模型求解,并利用Stehfest反演得到实空间的解,采用新的参数组合,分别绘制了压力和压力导数双对数曲线图版。从物理渗流机理上分析了层间越流对曲线形态的影响,随着越流系数的增大,径向流结束的时间越早;同时提出了利用典型图版拟合确定储层渗透率、表皮系数以及越流系数的方法。典型图版有助于定量评价越流的强弱,对煤层气井后续排采制度的调整具有指导意义。To study the effects of leaky aquifer on the earlier production of coalbed methane wells,the leaky aquifermodel was established based on transient flow theory.The model was solved under Laplace transform,and Stehfestreverse inversion was used to obtain the real space solution,then dimensionless pressure and pressure derivative typecurves were created in log-log plots with new parameters.Based on physical flow mechanism,the influence of leakyaquifer on curve shape was concluded that the radial flow would end earlier with stronger leakage coefficient.Theway to obtain permeability,skin factor and leakage coefficient by typical curve match was also proposed.Typicalcurves are useful for evaluating leaky aquifer and guiding subsequent production adjustment of CBM wells.

关 键 词：煤层气 地层水 越流 试井分析 

分 类 号：TE3[石油与天然气工程—油气田开发工程]