置换法压井方法的现场应用

置换法属于非常规压井方法，适用于空井、钻具水眼堵塞、井内无法建立压井液循环通道等工况。目前这种压井方法理论研究较多，相关现场应用案例分析较少。文章描述和分析了两起置换法压井案例:A井发生井喷后关剪切防喷器，剪断完井管柱控制井口，由于没有循环压井液通道，采用置换法压井并成功压井；B井在压井过程中发现井内钻具刺漏，无法循环压井液至井底，采用置换法进行压井，由于设备损坏和压井操作失误，压井失败。通过对两起压井案例的分析，提出改进方案，期望对以后类似作业具有一定的借鉴意义。

Field Application of Displacement Well Killing Method

The displacement method is unconventional well killing method, which is mainly used in the case of empty well, drilling tool blockage, and the situation that circulation channel of well fluid can not be set up in the well. At present, the displacement method is more theoretical research, and related feld application case analysis is less. In this paper, two cases of well killing with displacement method are described and analyzed. In well A, after the blowout occurred, the shear blowout preventer was closed, and completion string was cut off, and wellhead was controlled. Due to the lack of circulation channel, the displacement method is used to kill the blowout well. Finally the well killing was done successfully. In well B, because of drill pipe washout during well killing operation, it is not effective to circulate the fluid to the bottom of the well. Therefore, displacement method is used for well killing. The well killing failed because of the damage of equipment and the false operation of well killing. Through analysis of two cases of well killing, an improvement plan is put forward, which is expected to be a reference for similar operations in the future.