侵入气体沿井筒的上升规律研究  

Rising Migration Rule of Gas Kick in Wellbore

作　　者：孙士慧[1] 于晓文[1] 于国庆[2] 田龙[1] 袁圆 SUN Shi-hui YU Xiao-wen YU Guo-qing TIAN Long YUAN Yuan(Petroleum Engineering College, Northeast Petroleum, Daqing 163318, China Daqing Oil Filed Co., Ltd. of Petro China, Daqing 163453, China The Experimental Group of NO.1 Production Plant, Daqing 163000, China)

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 [3]大庆油田第一采油厂试验大队,黑龙江大庆163000

出　　处：《数学的实践与认识》2017年第10期104-111,共8页Mathematics in Practice and Theory

基　　金：国家科技重大专项课题"钻井工程一体化软件"(2016ZX05020-006)

摘　　要：地层气体侵入井筒后形成气液两相流动体系,气体沿井筒向上滑脱运移,随着所受压力的降低其发展变化过程会很快,如果不及时处理就会演变为井涌、井喷,甚至井喷失控.因此,准确的预测侵入气体沿井筒的上升规律,有助于认识气侵发展过程,同时为现场采取井控措施提供理论依据,有效避免井下复杂事故.基于侵入气体沿井筒运动的力学特性,建立了气体的上升速度模型,模型模拟分析表明:地层渗透率越高、机械钻速越快、单位时间内侵入井筒的气体量越多、气体上升速度越快,井底压力波动越大;施加一定的井口回压可以有效抑制气体的膨胀运移.Abstract： Gas-liquid two-phase flow is formed when gas kick has been taken during drilling. Gas kick migrate from bottomhole to surface. With the forces exerting on the gas kick decreases, gas develops quickly which can lead to a catastrophe if not dealt with properly. The precise rising velocity of gas kick is not only help to recognize the development of gas kick, but also provide theoretical basis for well control operation which can avoid drilling accidents effectively. Based on the force analysis and mass conservation, the rising velocity of gas kick is calculated. Model application shows that the higher formation permeability, the faster rate of penetration, and the more gas kick volume, bubble migrate faster and bottomhole pressure fluctuate severe. Applying a certain wellhead back pressure can inhibit the expansion and migration of gas kick effectively.

关 键 词：气侵 上升速度 井控 井口回压 

分 类 号：TE21[石油与天然气工程—油气井工程]