低渗透水驱油田面积井网见水时间计算新方法

Pridiction Model of Water Breakthrough Time of Area Well Pattern in Low Permeability Oilfield

李承龙 王宏志 赵欣 王一飞 杨桂南 孙鹏鹏

Chenglong Li Hongzhi Wang Xin Zhao Yifei Wang Guinan Yang Pengpeng Sun

中国石油大庆油田勘探开发研究院，黑龙江 大庆 163712 黑龙江省油层物理与渗流力学重点实验室，黑龙江 大庆 163712 中国石油大庆油田井下作业分公司，黑龙江 大庆 163000

Exploration and Development Research Instiute，China National Petroleum Corporation，Daqing Heilongjiang 163712，China Heilongjiang Key Laboratory of Reservoir Physics and Fluid Mechanics in Porous Medium，Daqing Heilongjiang 163712，China Downhole Operation Company，Daqing Oilfield Company Ltd. ，Daqing Heilongjiang 163000，China

低渗透油田储层应力敏感性较强，导致渗透率损失严重，引起启动压力梯度变大，渗流阻力增大，降低油田水驱效果。目前已有的见水时间预测模型未同时考虑应力敏感性和变启动压力梯度等因素，导致运算结果不符合矿场实际。为此，首次推导了考虑应力敏感性和变启动压力梯度的不等排距及井距条件下的五点法、四点法、反九点法井网见水时间预测模型。新模型计算结果误差相对较小，更符合现场实际，研究成果可指导区块措施调整，为改善水驱油田开发效果提供理论支撑。

The strong stress sensitivity of low permeability oilfield reservoirs leads to serious permeability loss,larger starting pressure gradient,and higher seepage resistance,thereby reducing the water?flooding effects of oilfields.The existing prediction models for water breakthrough time do not consider the stress sensitivity and variable starting pressure gradient at the same time,which results in inconsistency between calculation results and actual situation of mines.Therefore,for the first time,this paper deduced the prediction models for the water breakthrough time of well pattern of five point method,four point method,and inverse nine point method in the condition of unequal row spacing and well spacing considering stress sensitivity and variable starting pressure gradient.The calculation results show that the error of the new model is relatively small,which is more in line with the field practice.The results can guide the adjustment of block measures and provide theoretical support for improving the development of water drive oilfields.

国家重大科技专项“外围油田改善开发效果及提高采收率技术研究与应用”(2016E?0209);国家重大科技专项“低渗、特低渗复杂油藏规模有效动用关键技术”(2017ZX05013?006)

10.3969/j.issn.1006-396X.2022.03.010