低渗透致密气藏水平井探测半径研究  

Investigation Radius of Horizontal Well in Low- permeability Tight Gas Reservoir

作　　者：陈志明[1] 廖新维[1] 赵晓亮[1] 窦祥骥[1] 祝浪涛 

机构地区：[1]教育部石油工程重点实验室中国石油大学,北京102249

出　　处：《特种油气藏》2015年第5期90-94,155,共5页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划"陆相致密油高效开发基础研究"(2015CB250905);国家自然科学基金"超低渗透油藏注气提高采收率理论与技术研究"(U1262101);教育部高等学校博士学科点专项基金项目(新教师类)"CO2驱渗流机理及理论模型研究"(20120007120007)

摘　　要：为解决低渗致密气藏水平井的探测半径计算问题,建立了考虑渗透率动态效应和应力敏感下水平井渗流模型,并以鄂尔多斯盆地致密气藏为例,采用数值离散法得出水平井探测半径。结果表明：鄂尔多斯盆地致密气藏水平井探测半径曲线的拟合系数为1.2～1.3,小于未考虑渗透率动态效应和应力敏感的情形;水平井探测半径由小至大依次为考虑动态渗透率和压力敏感效应的情形,只考虑动态渗透率效应的情形,只考虑压力敏感效应的情形和不考虑动态渗透率和压力敏感效应的情形;其中,渗透率动态效应对探测半径的影响比压敏因素更显著。该研究对低渗致密气藏开发具有指导意义。Currently,there are few published researches on investigation radius of horizontal well drilled in low- permeability tight gas reservoir. To facilitate calculation of investigation radius of horizontal well drilled in low- permeability tight gas reservoir,a seepage model for horizontal well is built with consideration to permeability dynamic and pressure sensitivity effects. Investigation radius of horizontal well is determined by using numerical divergence with tight gas reservoir in the Ordos Basin as an example. Research results show that plots for investigation radius of horizontal well drilled in tight gas reservoir of the Ordos Basin has fitting coefficients of 1. 2- 1. 3,which are lower than those without considering permeability dynamic effects and pressure sensitivity. Investigation radiuses of horizontal wells change from low to high in the order of following cases: with consideration to dynamic permeability and pressure sensitivity effects,with consideration to dynamic permeability effects only,with consideration to pressure sensitivity effects only and without consideration to dynamic permeability and pressure sensitivity effects. In particular,permeability dynamic effect shows more profound impacts on investigation radius than pressure sensitivity. This study can provide valuable guidance for development of low- permeability tight gas reservoirs.

关 键 词：渗透率动态效应 压力敏感 数值离散 探测半径 水平井 致密气藏 

分 类 号：TE33[石油与天然气工程—油气田开发工程]