摘要
以往应用双孔单渗模型预测页岩气压裂水平井产能,没有直接考虑裂缝中气体在近井地带流动的复杂性,准确性差或无法真实反映气体的流动规律.在考虑页岩气基质解吸作用及滑脱效应影响的基础上,建立并求解考虑气体近井流动的数学模型.绘制井底拟压力与拟时间之间的关系曲线,并对开发过程中出现的裂缝线性流、双线性流及基质线性流进行分析,发现弹性储容比、裂缝渗透率和基质渗透率分别作用于不同的时期,提出模型的适用性.
For the previous double-porosity and individual-permeability model predicting the productivity of the fractured horizontal well in the shale gas cannot directly consider the complexity of the gas flow near the wellbore in the fractures, so the flow laws of the gas are poorly correct reflected or even have no way to naturally explore them. On the basis of considering the gas desorption and slippage effect of the matrix, the mathematical model of taking account of the above flow is established and sought for the solutions. The relation between the pseudo-pressure and pseudo-time is mapped. And furthermore the analyses on the linear flow in the fractures, bilinear flow and linear flow in matrix are conducted in the process of the development. The elastic storability ratio, fracture permeability and matrix permeability are found to act individually in the different periods. Finally we propose the feasibility and applicability the model are presented.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2014年第3期158-163,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家“973”重大专项“中国南方海相页岩气高效开发的基础研究”(SQ2012CB027805)
关键词
页岩气
多级压裂
水平井
近井流动
敏感性分析
shale gas
multi-stage fracturing
horizontal well
flow near wellbore
sensitivity analysis
