摘要
川西坳陷洛带气田遂宁组致密砂岩储层多具备独立的压力系统,压裂后压力恢复缓慢,多未出现径向流特征。针对致密砂岩气井压裂后的不同渗流特征,选择相应的试井井例,对洛带气田遂宁组气藏压力和产能进行监测;对储层水力压裂改造效果、井底污染情况进行评价;对砂体形状、连通情况,以及边界特征进行识别,辅助气藏地质认识;对地层压力恢复试井特征进行分析。结果表明,压力恢复作业前,应排出井底积液、排除井内异常工况,降低压力恢复的异常波动;评价解释需结合气藏地质特征和测试、测井、地震资料等多种动静态资料,以提高解释精度。该分析为遂宁组气藏特征描述、压裂效果评价、合理开发等提供了科学依据,对类似地质条件和生产工况下的致密砂岩气井压力恢复试井解释具有一定的借鉴意义。
The tight sandstone reservoirs of Suining Formation in Luodai gas field of Western Sichuan Depression mostly have independent pressure system,and the pressure recovery is slow after fracturing,and most of them have no radial flow characteristics.According to the different seepage characteristics of tight sandstone gas wells after fracturing,the corresponding well test cases are selected to monitor the pressure and productivity of Suining Formation gas reservoir in Luodai gas field;the effect of reservoir hydraulic fracturing and bottom hole pollution are evaluated;the sand body shape,connectivity and boundary characteristics are identified to assist gas reservoir geological understanding;and the formation pressure recovery well test characteristics are analyzed.The results show that before the pressure recovery operation,the bottom hole liquid should be drained,the abnormal working conditions in the well should be eliminated,and the abnormal fluctuation of pressure recovery should be reduced;the evaluation and interpretation should be combined with the geological characteristics of the gas reservoir and a variety of dynamic and static data such as testing,logging and seismic data to improve the interpretation accuracy.This analysis provides a scientific basis for the description of Suining Formation gas reservoir characteristics,fracturing effect evaluation and reasonable development,and has a certain reference for pressure build-up test interpretation of tight sandstone gas wells under similar geological conditions and production conditions.
作者
吴晓光
袁莉
李萌
王志文
林绍文
WU Xiaoguang;YUAN Li;LI Meng;WANG Zhiwen;LIN Shaowen(Well-Logging Services Company,SINOPEC Southwest Petroleum Engineering Co.Ltd.,Chengdu,Sichuan 610000,China)
出处
《油气井测试》
2021年第1期59-65,共7页
Well Testing
基金
中石化西南油气田科研项目“洛带气田遂宁组气藏剩余未动用储量精细评价”(15000033-18-ZC0609-0001)。
关键词
洛带气田
遂宁组
致密砂岩气藏
试井解释
压裂
压力恢复
线性流
Luodai gas field
Suining formation
tight sandstone gas reservoir
well test interpretation
fracturing
pressure recovery
linear flow
