裂缝型储层渗透率应力敏感评价及对生产影响

Stress sensitivity evaluation of permeability of fractured reservoir and its effect on production

曹耐 雷刚 董平川 李虹 沈茂丁 吴亚红1

中国石油大学（北京）石油工程教育部重点实验室，北京 102249 King Fahd University of Petroleum and Minerals，Dhahran 31261，Kingdom of Saudi Arabia 中国石油管道局工程有限公司，河北 廊坊 065000

MOE Key Laboratory of Petroluem Engineering, China University of Petroleum, Beijing 102249, China King Fahd University of Petroleum and Minerals, Dhahran 31261, Kingdom of Saudi Arabia China Petroleum Pipeline Engineering Co., LTD., Langfang 065000, China

针对裂缝型储层的不同裂缝类型，分别设计和进行了5种裂缝贯穿程度和4种裂缝充填模式的致密岩心渗透率应力敏感性实验，并分析了各种裂缝贯穿程度和裂缝充填模式的岩心渗透率应力敏感性差异。结合一维产能解析模型，分析了裂缝贯穿程度和裂缝充填模式对裂缝型油藏产油量的影响。研究结果表明：裂缝贯穿程度较小时，岩心渗透率应力敏感性主要体现为基质压缩，而随着裂缝贯穿程度增大，岩石应力敏感过程主要包括裂缝闭合和基质压缩2个阶段；岩心流量并不一定随着实验压差增大而简单增大，而是生产压差和岩心渗透率的综合函数。

Stress dependent permeability experiments are done to explore the influencing law for permeability change of tight fractured cores under increasing effective stress with five fracture penetration extents and four fracture filled patterns as influencing factors respectively. Based on the experiments, the stress sensitivity curve differentiation among each core with different fracture penetration extent and fracture filled pattern are analyzed and compared. Combined with the derived one?鄄dimensional analytical model, effects on production of fractured reservoirs caused by fracture parameters are further analyzed. The results show that, when fracture penetration extent is small, stress sensitivity is mainly expressed as matrix compression; with an increasing fracture penetration extent, stress sensitivity can be divided into fracture closure stage and matrix compression stage. The flow rate does not necessarily increase with experimental pressure drop, it is a synthetic function of pressure drop and permeability.

10.6056/dkyqt201902013