动态置换法压井参数计算  

Calculation of well killing parameters of the dynamic lubrication method

作　　者：任美鹏 李相方[2] 李莹莹[2] 

机构地区：[1]中海油研究总院,北京100027 [2]中国石油大学石油工程学院,北京102249

出　　处：《石油学报》2014年第2期365-370,共6页Acta Petrolei Sinica

摘　　要：通过研究气液两相泛流现象,提出了一种压井液注入和气体排出同时进行的动态置换法。通过理论分析得出,动态置换法压井过程中应满足井底压力恒定,气体排出过程应满足物质守恒,压井液全部下落到井底应满足泛流条件,从而建立了动态置换法压井参数计算模型。模型计算得到的气液注入速度比和最大压井液注入速度与Ramtahal实验数据比较接近,可应用到现场动态置换法的压井参数计算。通过对比动、静态置换法压井曲线,得出动态置换法在压井排量比较低情况下,压井时间比静态置换法短,井口压力比较低,从井控设备安全及井控工艺角度来说,动态置换法优于静态置换法。给出了动态置换法压井施工工序,对现场的压井施工有一定的指导意义。Based on the analysis of gas-fluid dual-phase flooding phenomenon, this study proposes a well kill method of dynamic displacement that involves kill fluid injection and simultaneous gas expulsion. In a theoretical process of well killing, dynamic displacement maintains constant bottomhole pressure; gas expulsion complies with the law of conservation of matter; and killing fluids fall downward to bottomhole, satisfying flooding conditions. Thus, a calculation model for well killing parameters of dynamic displacement is established. Gas-fluid injection rate ratio and maximal kill fluid injection rate estimated using the proposed model are close to the Ramtahal experimental data, demonstrating that the model is applicable for use in calculation of on-site well killing parameters. Comparison of well killing curves between dynamic and static displacement shows that at a relatively low killing rate, dynamic displacement involves a shorter period and lower wellhead pressure than static displacement. In terms of equipment safety and technology of well control, dynamic displacement is superior to static displacement. Finally, a well killing procedure of dynamic displacement is given, which provides a reference for on-site well killing operation.

关 键 词：钻井井控 置换法压井 动态置换法 泛流现象 压井参数 

分 类 号：TE256[石油与天然气工程—油气井工程]