Discussion on Safe Drilling Technology for Heterogeneous, Ultra-Thick and Active Bitumen Zone
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摘要: Y油田开发过程中多口井钻遇Kazhdumi层超厚活跃沥青,沥青地层的非均质性、空间分布的不确定性给钻井施工带来极大挑战,钻井液污染、涌漏并发、硫化氢逸出等复杂情况导致多口井工程弃井,严重影响了Y油田的整体开发进度。根据已钻井实钻资料,从沥青层压力、连通通道、沥青特征及分布规律等方面研究了沥青层环境因素,分析了活跃沥青层处理难点。在此基础上,提出强化沥青层分布规律研究、优化调整井身结构和控压钻井技术配合沥青硬化处理等技术对策。分析认为,活跃沥青层地层压力当量钻井液密度1.58~1.65 kg/L;现有井身结构中沥青层所在井段裸眼段长,是治理活跃沥青侵害的主要难点。沥青硬化封固剂YHJ-6能将沥青软化点提高60℃以上,将其应用于现场能有效减少沥青侵入量,提高沥青环境中漏失通道的封堵效果。Abstract: During development of Y Oilfield,several wells were drilled through Kazhdumi Formation which contains ultra-thick active bitumen.Those heterogeneous and scatterly-distributed formations brought severe challenges to drilling operation.In particular,drilling fluid contamination,simultaneous mud loss and well kick,escaping H2S and other complexities have caused abandonment of several wells and tampered with the overall progress of Y Oilfield development.Based on actual drilling data,the active bitumen zone is investigated in respect to formation pressure,connecting channel,bitumen feature and its distribution,and treatment difficulties are also analyzed.Then,the technical solution is proposed for further study on the distribution of bitumen and optimize casing program and managed pressure drilling(MPD)along with bitumen hardening process.The results show that the pressure of active bitumen is 1.58-1.65 g/cm3 and the long open hole where bitumen zone is encountered in current casing program is a bottleneck in the treatment of active bitumen.However,bitumen hardening agent YHJ-6 can increase the softening point of bitumen by over 60℃.Field test shows that this agent can effectively reduce the volume of bitumen invading into wellbore and enhance the sealing of leaking channel in bitumen environment.
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Keywords:
- active bitumen zone /
- drilling accident /
- accident treatment /
- bitumen hardening /
- Y Oilfield
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[1] Romo Louis A,Prewett Harry,Shaughnessy John,et al.Challenges associated with subsalt tar in the Mad Dog Field[R].IADC/SPE 110493,2007.
[2] Weatherl M H.Encountering an unexpected tar formation in a deep water Gulf of Mexico exploration well[R].IADC/SPE 105619,2007.
[3] Han Gang,Hunter Keith,Osmod Jerry,et al.Drilling through bitumen in the Gulf of Mexico:the shallower vs the deeper[R].OTC 19307,2008.
[4] Arseniuk S E,Becker D L,Barrett K R,et al.Drilling challenges in the bitumen saturated Grosmont Formation[R].SPE 143003,2010.
[5] Han Gang,Hunter Keith,Ressler Jamie,et al.Deepwater bitumen drilling:what happened downhole[R].IADC/SPE 111600,2008.
[6] 景彦平.沥青结构及高聚物改性沥青机理研究[D].西安:长安大学,2006. Jing Yanping.The study on asphalt structure and modification mechanism with high molecule polymer[D].Xi’an: Chang’an University,2006. [7] 李季.塔河超稠油胶质、沥青质形貌分析[J].石油与天然气化工,2010,39(5):454-456. Li Ji.Morphology analysis of resin and asphaltene[J].Chemical Engineering of Oil Gas,2010,39(5):454-456. [8] 王果,樊洪海,刘刚,等.控制压力钻井技术应用研究[J].石油钻探技术,2009,37(1):34-38. Wang Guo,Fan Honghai,Liu Gang,et al.Application of managed pressure drilling techniques[J].Petroleum Drilling Techniques,2009,37(1):34-38. [9] 周英操,崔猛,查永进.控压钻井技术探讨与展望[J].石油钻探技术,2008,36(4):1-4. Zhou Yingcao,Cui Meng,Zha Yongjin.Discussion and prospect of managed pressure drilling technology[J].Petroleum Drilling Techniques,2008,36(4):1-4. [10] 郭京华,夏柏如,黄桂洪,等.稠油沥青污染钻井液的处理技术[J].钻采工艺,2012,35(4):91-94. Guo Jinghua,Xia Bairu,Huang Guihong,et al.Treatment technique for bitumen-contaminated drilling fluids[J].Drilling Production Technology,2012,35(4):91-94. [11] 郭京华,夏柏如,赵增新,等.F19井沥青侵及相关井下复杂情况的处理[J].特种油气藏,2012,19(4):134-137. Guo Jinghua,Xia Bairu,Zhao Zengxin,et al.Treatments for bitumen contamination and associated downhole problems in Well F19[J].Special Oil Gas Reservoirs,2012,19(4):134-137.
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