Application of High Efficiency Speed-Up Drilling Technology in Well W60

Abstract

There are two sets of faults in the eastern slope belt of WN subsag in HLE basin, with large dip angle and interbedded glutenite of NT formation and TBM formation. Therefore, there are some difficult problems in the process of drilling, such as easy well deviation, well leakage, difficult deviation control, easy bit wear, low base fracture pressure, difficult cementing and so on. The above problems have been effectively solved by optimizing wellbore structure and drilling fluid system, optimizing drilling tool assembly and optimizing drilling parameters. The torque impact speed increasing tool is applied in well W60, equipped with PDC bit and preferred SMD537X cone bit to enhance the adaptability of the bit. The single-trip drilling footage is 449.76 m, and the ROP is 5.57 m/h, which is 109% higher than that of the adjacent well. The speed-up effect is outstanding, realizing anti-deviation and fast drilling. The industrial oil flow of 5.50t/d was obtained in well W60 after fracturing, leading to find a high-yield and oil-rich zone for the east slope of WN sub-sag and achieve the purpose of exploration and discovery.