Application of sidetracking drilling ?95.25 mm casing cementing and completion technology in Changqing Oilfield
The sidetracking drilling and completion method in Changqing Oilfield used the liner cementing with ϕ88.9 mm hanging,and the inner diameter of the tubing after cementing was only ϕ76 mm,which limited the ability and scale of the late workover operation and fracturing stimulation operation.Besides,the existing completion string cannot be used for full-diameter fracturing,which cannot meet the requirements of tight oil and gas reservoir fracturing technology.By expanding the bore diameter(ϕ82.25 mm)with theϕ95.25 mm casing and using the liner hanger and tieback assembly for staged fracturing,the hydraulic pumping bridge plug+staged fracturing process after the liner cementing was carried out,which greatly im-proved the effect and efficiency of the construction.The lateral drilling with ϕ95.25 mm casing cementing and completion technology has been applied in 5 wells in Changqing Oilfield,the cementing quality quali-fied rate is 100%,the average initial daily production is increased by 46.5%compared with the completion with ϕ88.9 mm tubing,and the construction time is shortened by 80%.Therefore,the technology applica-tion provides a good reference for the inner drilling and completion in the area.
sidetracking drillingliner cementingstaged fracturingliner hanger and tieback assembly
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