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《Fault-Block Oil & Gas Field》 2018-03
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Drilling rate improvement technology for deep wells and its application in Qingxi Oilfield

LI Chao;DOU Liangbin;LI Zhenxing;KANG Kai;ZHOU Xin;HAN Tianxing;Drilling and Production Engineering Research Institute,Yumen Oilfield Company,PetroChina;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;School of Petroleum Engineering,Xi′an Shiyou University;  
Due to the complex geological conditions, variable lithology, high formation dip, uncontrollable well deviation and poor drillability in Qingxi Oilfield, countermeasures of drilling rate improvement technology were proposed according to spud-in sequence and geological stratification data from surface to bottom. In this paper, to address the problems of large dip angle and uncontrollable well inclination in upper nappe formation, technology of anti-deviation and fast penetration with pre-bending dynamic BHA is used;in the second section, high efficient PDC bits are segmentally optimized due to thick gravel bed and short bit footage in N2 n+N1 t section; in the third section, to solve problems of variable lithology, high grindability and poor drillability in cretaceous formation,torsion impactor and New-Drill are adopted to enhance ROP. Through evaluating the drilling rate improvement result, technological template for different formations was formed and it was generalized in 18 wells in Qingxi Oilfield. It shows that drilling speed of Qingxi Oilfield is improved significantly. ROP is enhanced from 1.98 m/h to 2.44 m/h, while the average drilling period is decreased from 184.4 d to 168.7 d on the condition of the average well-depth increase of 239.7 m. Research results indicate that the establishment of drilling speed enhancement technique template for Qingxi deep wells has outstanding performance and could provide reference for analogous formations in other oilfields.
【Fund】: 国家自然科学基金项目“酸性气体侵入井筒在钻井液内赋存状态及对瞬态流动影响研究”(51604224);; 中国石油科技攻关项目专项“逆掩推覆带优快钻完井技术研究”(2013E-3308);; 国家重点实验室开放课题“基于微裂缝发育表征和主地应力及差异评价的页岩油储层可压裂性分级表征方法研究”(PRP/open-1703)
【CateGory Index】: TE245
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