基于试井法的水驱气藏水侵识别及水侵规律研究  

Water Intrusion Identification and Regularity of Water Drive Gas Reservoir Based on Well Test Method

作　　者：范昭宇 王琴 宋兆杰[2] 张骞 韩鑫 周鑫 Fan Zhaoyu;Wang Qin;Song Zhaojie;Zhang Qian;Han Xin;Zhou Xin(CNOOC(China)Limited Hainan Branch,Haikou Hainan 570300;Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570300 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249

出　　处：《中外能源》2025年第1期57-64,共8页Sino-Global Energy

摘　　要：为尽可能避免因气井过早见水造成气藏采收率降低,采用不稳定试井法研究水侵过程气水边界的动态变化,采用数值试井法研究气藏的水侵规律。结果表明,气藏水侵后体现为能量补给,压力导数曲线末端下掉;从气区到水侵区后流体流动性变差,压力导数曲线末端上翘。边、底水推进在气井试井曲线上的动态反映特征使压力导数曲线呈现时间差异性,水离气井越近,压力导数变化时间越早。单一方向水驱的边水响应特征是压力导数曲线上翘,环绕水驱的边水响应特征是压力导数曲线先下凹后上翘。在相同累产下,配产越高,气水边界距离越小,气水边界推进速度越快。采气速度越大,无水采气时间越短。无水采出程度随采气速度的增大先上升后下降。在相同采出程度下,采气速度越高,气水边界推进速度越快;储层渗透率越大,气水边界距离越小,气水边界推进速度越快。To avoid the reduction of gas recovery due to early water breakthrough in gas wells,the dynamic change of gas-water boundary during water intrusion is studied by the unsteady well test method,and the water intrusion regularity is analyzed by the numerical well test method.The results show that the energy is replenished and the end of the pressure derivative curve drops off after water intrusion in the gas reservoir.The fluid flows slowly and the end of the pressure derivative curve turns upward from the gas zone to the water intrusion zone.The dynamic characteristics of edge and bottom water advancing on the gas well test curve make a time difference on the pressure derivative curve,that is to say,the closer the water is to the well,the earlier the pressure derivative changes.The response characteristic of edge water for single-direction water drive is that the pressure derivative curve turns upward,and the response characteristic of edge water around water drive is that the pressure derivative curve is first concave and then up.Under the same cumu-lative production,the higher the production allocation,the smaller the distance between the gas-water boundary and the faster the gas-water boundary advances.The higher the gas recovery rate,the shorter the water-free gas production time.With the increase in gas recovery rate,the water-free recovery percent first increases and then decreases.Under the same recovery percent,the higher the gas recovery rate,the faster the gas-water boundary advances.The larger the permeability of the reservoir,the smaller the distance between the gas-water boundary and the faster the gas-water boundary advances.

关 键 词：不稳定试井 数值试井 水驱气藏 水侵 采出程度 气水边界 

分 类 号：TE377[石油与天然气工程—油气田开发工程]