Abstract: It would bring about greater engineering difficulty of formation test when formation pressure factor is up to 2.5. In an overpressured reservoir, if a hole interval to be tested was subjected to inflow of a large volume of high-density mud during its drilling process, integrated with poor diagenesis and unconsolidation,possible sand problem and mud return could take place in production testing, resulting in plugging or sticking troubles of test pipe string. Once the troubles happened, the well could hardly make a renovation and even be abandoned. Based on the production test process for Huo-10 Well in southern margin of Junggar basin, the technologies for production test of abnormal-high-pressure wells are proposed, including rejection of sand production, optimized perforation, string stress analysis, wellhead auto-monitoring and safe safety enclosed mode, etc. They are of significance for reference to the production or formation test of similar complex wells.

Key words: Junggar basin, southern margin, abnormal high pressure, exploration well, production test, formation test, technology