顺北5号断裂带南部压力剖面建立及井身结构优化

Establishing Pressure Profiles and Casing Program Optimization in the Southern Shunbei No. 5 Fault Zone

李双贵 罗江 于洋 汤明 易浩 曾德智

LI Shuanggui LUO Jiang YU Yang TANG Ming YI Hao ZENG Dezhi

中国石化西北油田分公司石油工程技术研究院, 新疆乌鲁木齐 830011 中国石化缝洞型油藏提高采收率重点实验室, 新疆乌鲁木齐 830011 油气藏地质及开发工程国家重点实验室（西南石油大学）, 四川成都 610500

Research Institute of Petroleum Engineering, Sinopec Northwest Oilfield Company, Urumqi, Xinjiang, 830011, China Sinopec Key Laboratory for Enhanced Oil Recovery in Fractured and Vuggy Reservoirs, Urumqi, Xinjiang, 830011, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China

顺北5号断裂带南部受断裂构造运动影响，钻井过程中普遍存在恶性漏失、钻井效率低等问题。为此，基于邻井成像测井资料和钻井资料，建立了漏失压力计算模型，得到了顺北5号断裂带南部地层的四压力（孔隙压力、破裂压力、坍塌压力和漏失压力）剖面；根据四压力剖面和钻井技术难点优化井身结构，将侵入体未发育区域原有的五开井身结构优化为四开井身结构，并减小井眼尺寸，缩短了钻井周期；针对侵入体发育区域，设计了地层承压能力强的非常规四开井身结构和缩小井眼尺寸的常规五开专封井身结构，提高了井壁稳定性。现场试验表明：所建漏失压力计算模型的预测准确性较高；应用常规五开专封井身结构后，复杂情况处理时效平均缩短 27.8 d，钻井周期平均缩短14.6%。研究和现场试验表明，顺北5号断裂带南部采用优化后的井身结构能够解决钻井过程井漏和钻井效率低的问题，可为复杂地层超深井井身结构设计提供技术借鉴。

The southern part of the Shunbei No. 5 fault zone is affected by structural fault movement. Numerous drilling problems such as severe leakage and low drilling efficiency frequently occur. Based on adjacent well logging data and drilling data, a leakage pressure model was established, and a four-pressure profile (pore pressure, fracture pressure, collapse pressure and leakage pressure) of the southern formation in Shunbei No.5 fault zone was obtained. According to the pressure profile and drilling technical problems, casing program without invasive body was optimized from original five-section to four-section. As a result, the borehole size was reduced and the the drilling cycle was shortened. For areas with an invasive body, a unconventional four-section casing program with stronger formation pressure-bearing capacity and a conventional five-section sealing casing program with reduced borehole size was designed. The wellbore stability dramatically improved. The field test demonstrated that the prediction accuracy of leakage pressure is high. The average time for dealing with complex situation is shortened by 27.8 days and the average drilling period reduced by 14.6% after applying the five-section sealing casing program. The research showed that the optimized casing program in Shunbei No. 5 fault zone can solve the problems such as leakage and low drilling efficiency during drilling process, and provide technical guidance for complex ultra-deep formation casing program design.

国家自然科学基金面上项目“静载、振动与腐蚀作用下HS/CO气井完井管柱螺纹密封面的力化学损伤机制研究”（编号：51774249）和中国石化重大科技项目 “顺北油气田一区优快钻井技术研究”（编号：P18021-1）联合资助

https://doi.org/10.11911/syztjs.2022037