裂缝型低渗油藏主、侧向井渗透率推算

Permeability calculation of principal stress directional and lateral wells in fractured low permeability reservoir

卢丽 陈小凡 夏彪 乐平 易红 李晨溪

西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 中国石油长庆油田公司第二采油厂，甘肃 庆阳 745100 重庆科技学院，重庆 401331

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, China No.2 Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang 745100, China Chongqing University of Science and Technology, Chongqing 401331, China

低渗油藏一般都发育不同程度的天然微裂缝，这些裂缝直接或间接地与水力压裂缝沟通，造成主、侧向井平均渗透率的差异。目前还没有一种能准确推算低渗油藏主、侧向井间等效渗透率的方法。文中在低渗透油藏注水见效时间预测公式的基础上，根据实际动态生产资料，反推计算主、侧向井的渗透率。利用西峰油田长8储层M油藏现场动态资料进行实例验证，证明该方法在现场应用中简单可行。该方法为地质建模、油藏数值模拟、渗流分析技术，以及井排距调整方案等提供了更加准确的数据基础。

Low permeability reservoirs generally develop different degree of natural micro-fractures, which directly or indirectly link up with the hydraulic fracture, causing the different average permeability of principal stress directional and lateral wells. There is still not any method to accurately calculate the equivalent permeability of principal stress directional and lateral wells in low permeability reservoirs. This paper uses the responding time of waterflooding to extrapolate the permeability of principal stress directional and lateral wells based on the predication formula for the responding time of waterflooding and field dynamic production data. The dynamic data for M oil reservoir of Chang 8 in Xifeng Oilfield show that this method is simple and feasible in field application,which can provide more accurate data base for geological modeling, reservoir numerical simulation, percolation analysis and well row spacing adjustment.

10.6056/dkyqt201302018