· Txuas cov casing rau hauv qhov dej, kaw lub qhov rooj qhov chaw thiab dais ib feem ntawm qhov hnyav ntawm casing;
· Dai tubing thiab downhole cov cuab yeej, txhawb nqa qhov hnyav ntawm tubing thiab kaw qhov chaw annular ntawm tubing thiab casing;
· Tswj thiab kho cov roj ntau lawm;
· Ua kom muaj kev nyab xeeb ntawm qhov chaw tsim khoom.
· Nws yog qhov yooj yim rau kev tswj xyuas, nqa-down ua haujlwm, kuaj thiab ntxuav paraffin;
· Sau cov roj siab thiab cov ntaub ntawv casing.