漏喷同存地层吊灌作业安全时间研究

Research on Safety Time of“Hang-Off”Operation in Leakage-Overflow-Coexistence Stratum

目前针对多压力系统裂缝性地层漏喷同存问题,多为定性、半定量化地研究漏喷同存问题出现的原因和针对喷漏同存采取的堵漏压井技术,缺乏多压力系统裂缝性地层漏喷转换时间的研究,且在出现井漏失返后,吊灌作业主要靠经验确定时间间隔,存在较大误差,一定程度上会导致出现溢流甚至井喷事故的发生。建立了多压力系统裂缝性地层漏喷转换时间计算模型,通过对数学模型的求解,得到漏喷转换时间的计算方程,并通过再现明格布拉克油田现场数据和已发表文献的模拟结果,验证了模型的有效性。在此基础上,对多压力系统裂缝性地层漏喷转换时间的影响因素进行了分析。研究成果可为裂缝性地层井控安全提供依据。

Most studies on leakage-overflow-coexistence in fractured stratum with multi-pressure systems are qualitative and semi-quantitative research on the causes of the leakage-overflow-coexistence and corresponding plugging-killing techniques.And the study on conversion time between lost circulation and overflow in fractured stratum is insufficient.After leakage,the time interval of“hang-off”operation is determined by experiences,which may lead to huge errors and cause overflow and blowout accidents.This research established a leakage-overflow-conversion time computation model for fractured stratum with multipressure systems.With the solution of the model,equation for the conversion time was obtained.The validity of the model was verified by reproducing the of field data in Mingbulak oil field and simulation results of published references.On that basis,the influencing factors of leakage-overflow-conversion time are analyzed.The research results can provide scientific basis for the safety of well control in fractured stratum.