Research On Improving Drilling Speed Technology In Bamai Area

With new drilling tools development and new technologies being promoted, enhancing ROP has become a topic of growing interest in the drilling industry at home and abroad. At present, there is a gap of drilling in complicated geological conditions between China and other advanced countries. The average well construction period and the use of bits and other indicators are about twice as the United States usage. Foreign drilling companies develop rapid drilling technology research mainly from designing reasonable casing programme,optimization the drilling parameters and developing more new-type of drilling fluid additives and so on.which provides novel ideas for enhancing ROP.This paper takes Ba Mai region as an example, which still exists many underground complex accidents while drilling, and long cycle of building well, leading to high cost.Key drilling technology in improving rate of penetration has been carried out as following. According to Ba Mai area geological features, formation pressure profile is established to optimiz well structure. Comparing screw drill tool combined PDC bit and high-speed Turbo combined pregnancy set bit two species composite drilling way, Turbo speed, and torque, and power, Turbo output characteristics model has been established. Drilling liquid displacement on Turbo structure parameter of effect and output characteristics parameter of effect have been analyzed, high-speed Turbo combined impregnated bits has been proposed to enhance the speed of drilling, at the same time optimization of design of drill stem and drilling parameters, penetration rate was raised up and well construction period was shortened. Analysis Ba Mai region formation pressure system, liquid phase UBD is determined to raise the drilling speed. Underbalance pressure and drilling fluid density and drilling parameters are determined. Underbalanced drilling field application effect is also analyzed. Laboratory test and compressive strength of log data are used to establish stratigraphic sections, drill ability class sections, and whole-rock profile optimizing bit type. Laboratory test evaluate performance of existing drilling fluid system and high temperature agents, forming a new high density drilling fluid system.Research results showed that:For Ba Shituo region three open well structure:(?244.5 mm technology casing seal across Carboniferous high pressure layer paragraph, four open Devonian and records left Department formation in low density conditions open, then the cycle of building well obviously shortened.Turbo tie pregnancy set bit is improve jade North area open sent is hereby mine grams group mechanical drill speed of main technology method, and application two species high-speed Turbo 99 level T1XL MK1-FBS and 138 level TSXL MK1-FBS respectively tie ?215.9mm E1158A2 and ?215.9mm K507STBPXXC two species pregnancy set bit composite drilling effect better. Using liquid phase UBD technology in Yu Bei region Eagle Mountain group gray rock formation in ?215.9mm borehole,controling dynamic underbalance pressure value between 0.10MPa and 2.58MPa, while static underbalance pressure value between 1.84MPa and 4.29MPa, as a result the average ROP reached 3.00 m/h, which is two times than the offset well.For Ba Shituo region small Haizi group, and kalashayi group and East pond group formation can drill sex level value high, and Abrasive strongly recommends using the G506, M1955SS and ST316TUH PDC bit.Optimized performance of high temperature and high density drilling fluid system is stable, has good borehole stability.The research methods and results provide a good reference for the drilling design and drilling construction in Northwest Ba Mai region and other similar oilfields.