Shale Oil Horizontal Drilling Technology with Super-Long Horizontal Laterals in the Longdong Region of the Changqing Oilfield

In order to solve technical problems such as the difficult control of well trajectory, low ROP, plugging difficulties in the horizontal section, sidewall instability and difficulties in running completion casing in super-long horizontal sections in shale oil in the Longdong region of the Changqing Oilfield, a shale oil horizontal drilling technology with super-long horizontal section has been formed by means of the optimization and controlling of well trajectory, the selection of rotary-steerable BHA, and the application of high-performance WBM and casing floatation running technology according to the characteristics of thief zone and leakoff rate as well as various plugging measures. This technology was successfully applied for drilling the horizontal Well H50-7 with super-long horizontal section of 4,088.00 m in Longdong Region of Changqing Oilfield, which indicated that the technology could solve the technical difficulties of horizontal wells with a super-long horizontal section, to provide technical support for shale oil development in this region