Research and Application of High Efficiency Drilling Technology in Condensate Gas Field in Bohai Oilfield

Abstract An oil-bearing structure in the southwest of Bozhong Sag in Bohai Oilfield contains large oil and gas reserves. It will be a key area for Bohai oilfield to increase reserves production. The main target layer in this block is the fractured granite formation in buried hill. Exploration work in this block is faced with many operational problems such as "deep burial, high temperature and high pressure (HTHP), low penetration rate, difficult reservoir protection, and low accuracy interface determination". Through technical research and field practice, aiming at "all well sections drilling rate speed-up, operation safely and efficiently, and releasing production capacity", a set of key technology system suitable for offshore oilfield deep exploration is formed. Since the application of this technology system, it has effectively improved the efficiency of well construction, greatly reduced the cost of exploration and operation, facilitated the discovery of oil and gas in multiple mid-depth strata. It has achieved a good operation effect on social and economic benefit.