低渗透油藏面积井网产能计算方法  

A New Method to Calculate Well Pattern Productivity in Low Permeable Reservoir

作　　者：刘海龙[1,2] 吴淑红[1,2] 

机构地区：[1]中国石油勘探开发研究院油气田开发软件中心,北京100083 [2]提高石油采收率国家重点实验室,北京100083

出　　处：《哈尔滨理工大学学报》2016年第1期93-99,共7页Journal of Harbin University of Science and Technology

基　　金：中国石油集团重大科技专项(z121100004912001)

摘　　要：针对低渗透油藏储层流体难以动用和采收率低的难题,基于低渗透油藏非达西渗流理论,考虑启动压力梯度,从两参数模型出发,利用流线积分方法,建立了面积井网产量计算数值积分模型,引入有效启动系数,给出了反九点井网有效启动系数与井距的关系图版,同时分析了井网井距、注采压差对产量、有效启动系数的影响.研究表明:井网井距越大,产量越低,启动系数越低.在经济和技术指标所允许的范围内,采用小井距开发低渗透油藏,可提供低渗透油藏采收率.In low permeability reservoirs, it is difficult for the reservoir fluid to flow, and the recovery factor is very low. Based on the non-Darcy flow in low permeability reservoir, taking threshold pressure gradient into consideration, in this paper, we build a new method to calculate the well pattern. This method is based on the two-param- eter continuous model, and the method of flow line integrals and the numerical integration were used to build the productivity model. By introducing the effective threshold coefficient, the relationship between the effective threshold coefficient and the well spacing was established. What＇s more, the effect of the well spacing and the water injection differential pressure on the productivity and effective threshold coefficient were analyzed. The studies show that： the larger the well spacing is, the lower the yield production is, and the lower the effective threshold coeffi- cient is. Reducing well spacing is good for the low permeability reservoir development and can improve the recovery factor.

关 键 词：低渗透油藏 启动压力梯度 有效启动系数 井距 注采压差 

分 类 号：O175[理学—数学]