Lub luag haujlwm tseem ceeb ntawm tsob ntoo Christmas

(1) Txuas ntau txheej ntawm casing downhole, kaw qhov chaw annular ntawm txhua txheej ntawm casing, thiab dais ib feem ntawm qhov hnyav ntawm lub casing.
(2) Ncua tubing thiab downhole cov cuab yeej, txhawb nqa qhov hnyav ntawm txhua txoj hlua tubing hauv qhov dej, thiab kaw qhov chaw annular ntawm tubing thiab casing.
(3) Tswj thiab tswj kev tsim cov roj qhov dej.
(4) lav kev tsim kho ntawm ntau yam downhole kev ua haujlwm, thiab pab txhawb kev tua zoo, kev ua haujlwm tripping, thiab lwm yam.