Expandable Tube-Suspended Recompletion Technology for Gas Injection Wells in Basement Reservoirs,Chad
The buried-hill basement reservoirs of oilfields in Chad demonstrate low pressure and low produc-tion of oil production wells.To improve the well production,gas injection is required to replenish the formation en-ergy.However,the reservoirs are filled due to sand production in upper layers after the open-hole development wells are converted to gas injection wells.A lower completion string consisting of an expandable tube hanger and an open-hole packer was run in Well BX20 in buried-hill reservoir of Block B,Chad,for a pilot test of recompletion technology.The test results show that the designed recompletion string is set successfully in one trip,with the en-tire operation period of 10 d,which is 7 d less than the average operation period of traditional recompletion tech-nology,corresponding to US＄200 000 of workover costs or more saved.After the recompletion,the casing is ef-fectively sealed and protected from damage caused by high-pressure gas injection,ensuring the wellbore integrity of the open-hole gas injection wells.The gas injection pressure reaches 20 MPa,and the daily gas injection rate rea-ches 2 000 m3/h.The proposed recompletion technology is proved suitable for gas injection wells in basement res-ervoirs in Chad,and has a demonstration effect on the development of similar oilfields.
gas injection well in basement reservoirexpandable tube-suspended recompletionburied-hill reservoirlower completion stringwellbore integrity
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