关井期间连续气侵气泡在井筒的动态运移分析  

Wellbore Flow Analysis of Continuous Gas Invasion During Shut-in

作　　者：孙士慧[1] 闫铁[1] 于国庆[2] 陈勋[1] 李井辉[1] 

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]中石油大庆油田有限责任公司,黑龙江大庆163453

出　　处：《数学的实践与认识》2015年第17期141-146,共6页Mathematics in Practice and Theory

基　　金：国家自然科学基金项目(51374077)

摘　　要：在停止循环状态关井条件下,由于井筒储集效应的影响,地层气会继续侵入井筒,侵入气体沿静止钻井液向上滑脱运移,井口回压与井底压力随之增加,威胁井控安全,因而,有必要研究关井条件下,气泡在井筒内滑脱上升时引起的井口和井底压力波动规律.考虑井筒储集效应,建立了关井期间井底压力和井口压力的计算模型,并对模拟井关井过程中气泡沿井筒运移特性进行了分析.模拟分析结果表明:不同气侵量下,随着关井时间的延长,井底压力和井口压力增加,渗透率低的地层井底压力较高,井口套压稳定的速度较快;当井筒气侵量一定时,随着关井时间的延长,井底压力和井口压力增加,渗透率高的地层井底压力、井口套压较高.Due to the effect of wellbore storage, shut-in period allows additional inflow of gas bubbles into the annulus. Wellbore and casing pressure increase with increase in shut- in time as a consequence of gas upward migration, which will threaten the safety of well control. Therefore, the variation laws of surface and wellbore pressures which are caused by upward gas migration and gas compressibility at well shut-in should be investigated. Based on wellbore storage effect, a new model to the wellbore and casing pressure build-up during shut-in for a gas kick well is developed in this paper. Simulation results show that at different gas kick volumes, the rate of bottom-hole pressure rise increases as the permeability decreases. And surface casing pressure stabilizes quickly for low permeable formations. However, at equal initial annular gaseous volume, the rates of rise of the bottom-hole and surface casing pressures for low permeable formations are slower than for high permeability formations.

关 键 词：关井 井筒储集效应 连续气侵 井底压力 井口压力 

分 类 号：TE312[石油与天然气工程—油气田开发工程]