异常高压定容气藏生产特征及开采措施探讨——以东海X气井为例

Discussion on Production Characteristics and Exploitation Measures of Abnormal High Pressure Gas Reservoirs with Constant Volume:A Case Studied in the East China Sea

东海深层气井易发生停喷现象,井筒压力损耗大与流程压力过高均为停喷的重要原因。落实东海异常高压气藏生产特征以及动储量采收率,可为该类型气藏动态分析及后期措施潜力提供依据,此文以X气井为例,分析了异常高压定容气藏的开采特征,并对停喷后现场措施效果进行了分析与探讨。分析结果表明:东海某异常高压定容气藏岩石孔隙膨胀能为开采前期的主要能量来源,占比约70%,地层能量相对常压气藏较为充足,采收率较常规气藏高。当气井无法自喷时,采取放喷或压降等措施来提高采收率,应用效果良好,可为类似气藏开发提供依据。

Deep gas wells in the East China Sea are prone to stop producing.Large wellbore pressure loss and high process pressure are important reasons.The production characteristics of abnormal high pressure gas reservoirs in the East China Sea and the recovery of dynamic reserves can provide a basis for the dynamic analysis of this type of gas reservoirs and the potential of follow-up measures.Taking X gas well as an example,this paper analyzes the production characteristics of abnormal high pressure gas reservoirs with constant volume.Then analyzes and discusses the effect of field measures after stopping producing.The results show that rock pore expansion of an abnormal high pressure gas reservoir in the East China Sea is the main energy source in the early stage of production,accounting for about 70%.This type of gas reservoir has sufficient formation energy and higher recovery rate than conventional gas reservoir.When the gas well is unable to gusher,some measures such as blowout or depressurization can be taken to improve the recovery.The application effect is good,which can provide a basis for the development of similar gas reservoirs.