自流注气钻完井关键技术及其在涠洲油田的应用
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摘要
涠洲油田同时存在异常高压、原始地层压力和异常低压储层,该油田生产井AX-3井提前见水、增油量降低,亟需调整开发方案。在分析国内外自流注气理论的基础上,结合天然气人工运移技术,设计了自流注气井AX-S3井。通过复杂压力梯度钻井液技术、复杂压力梯度随钻测压技术、多级屏障单元分层完井技术、油管内注氮气举清喷技术等关键钻完井技术措施的研究与应用,顺利完成了自流注气井AX-S3井钻完井作业,下部高压气层清喷产气量10×10~4 m~3/d,上部低压油层平均产气量0.26×10~4 m~3/d,最终实现了AX-S3井井筒下部高压涠三段气顶气自流至上部低压涠二段主力油层,进而使上部低压油层平均产气0.43×10~4 m~3/d、预测地层压力系数可自由恢复至0.99。本文成果可为类似油气田的自流注气开发提供借鉴。
In WZ oilfield,where reservoirs with abnormal high pressure,initial formation pressure and abnormal low pressure were encountered,one production well titled AX-3 experienced early water breakthrough and declined oil increment,which resulting in adjusting the existing development plan urgently.Based on the theoretical research of artesian gas injection at home and abroad,the first artesian gas injection Well AX-S3 was designed,referencing the pilot test of natural gas artificial migration technology.Through the research and application of drilling and completion technology measures such as complex pressure gradient drilling fluid technology,complex pressure gradient PWD technology,multilevel barrier unit completion technology and in-tubing nitrogen injection and blowout technology,Well AX-S3 was successfully completed.The gas production of lower reservoirs with high pressure was 10×10~4 m~3/d and that of upper reservoirs with low pressure 0.26×10~4 m~3/d,which led to gas flowing automatically from the high pressure gas cap in the Third Member of WZ Formation to the low pressure main pay zone in the Second Member of WZ Formation.As a result,the average gas production of upper low pressure oil reservoirs increased to 0.43×10~4 m~3/d and the formation pressure coefficient recovered to 0.99.Therefore,the successful application of this technology in the WZ oilfield can provide guidance for the development of similar oil/gas fields by artesian gas injection technology.
In WZ oilfield,where reservoirs with abnormal high pressure,initial formation pressure and abnormal low pressure were encountered,one production well titled AX-3 experienced early water breakthrough and declined oil increment,which resulting in adjusting the existing development plan urgently.Based on the theoretical research of artesian gas injection at home and abroad,the first artesian gas injection Well AX-S3 was designed,referencing the pilot test of natural gas artificial migration technology.Through the research and application of drilling and completion technology measures such as complex pressure gradient drilling fluid technology,complex pressure gradient PWD technology,multilevel barrier unit completion technology and in-tubing nitrogen injection and blowout technology,Well AX-S3 was successfully completed.The gas production of lower reservoirs with high pressure was 10×10~4 m~3/d and that of upper reservoirs with low pressure 0.26×10~4 m~3/d,which led to gas flowing automatically from the high pressure gas cap in the Third Member of WZ Formation to the low pressure main pay zone in the Second Member of WZ Formation.As a result,the average gas production of upper low pressure oil reservoirs increased to 0.43×10~4 m~3/d and the formation pressure coefficient recovered to 0.99.Therefore,the successful application of this technology in the WZ oilfield can provide guidance for the development of similar oil/gas fields by artesian gas injection technology.
引文
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[3]卢宇,李海涛,唐英才,等.疏松砂岩气藏自流注气井射孔工艺研究[J].油气井测试,2016,25(1):42-45.LU Yu,LI Haitao,TANG Yingcai,et al.Artesian well perforating technology research in weakly consolidated sand formation reservoir[J].Well Testing,2016,25(1):42-45.
[4]HOSSAIN M M,RAHMAN M K,RAHMANS S S.Hydraulic fracture initiation and propagation:roles of the wellbore trajectory,perforation and stress regimes[J].Journal of Petroleum Science&Engineering,2007,23(7):129-149.
[5]周俊昌,罗勇,严维锋.国内第一口自流注水井钻井实践[J].中国海上油气,2011,23(1):43-45,52.ZHOU Junchang,LUO Yong,YAN Weifeng.Drilling practice of the domestic first water dumping well[J].China Offshore Oil and Gas,2011,23(1):43-45,52.
[6]PAPAMICHOS E,FURUI K.Sand production initiation criteria and their validation[C].ARMA300-304,2013.
[7]曾春珉,韦龙贵,黄亮,等.超长跨距多点起爆负压射孔技术在海上油田的应用[J].石油钻采工艺,2016,38(2):181-185.ZENG Chunmin,WEI Longgui,HUANG Liang,et al.Application of negative-pressure perforation technique with multiple igniters over super-long span in offshore oilfields[J].Oil Drilling&Production Technology,2016,38(2):181-185.
[8]夏宏南,陶谦,王小建,等.深井长裸眼复杂压力层系堵漏技术研究与应用[J].断块油气田,2006,13(3):61-63.XIA Hongnan,TAO Qian,WANG Xiaojian,et al.Sealing technical research and application in complex pressure strata of long open hole in deep well[J].Fault-Block Oil and Gas Field,2006,13(3):61-63.
[9]张宏军,张伟,杨亚馨,等.复杂地层多套压力层系尾管完井固井新工艺[J].石油钻探技术,2004,32(3):50-52.ZHANG Hongjun,ZHANG Wei,YANG Yaxin,et al.New cementing and completion techniques with liners under plural pressure systems[J].Petroleum Drilling Techniques,2004,32(3):50-52.
[10]管申,谭强,黄熠,等.海上复杂压力体系油田钻井安全密度窗口研究[J].天然气与石油,2015,33(5):52-55.GUAN Shen,TAN Qiang,HUANG Yi,et al.Study on safe drilling density window in offshore oilfield with complex pressure system[J].Natural Gas and Oil,2015,33(5):52-55.
[11]吴晗,吴晓东,付豪,等.海上气田气举诱喷排液一体化技术[J].中国海上油气,2011,23(4):263-266.WU Han,WU Xiaodong,FU Hao,et al.Gas lift induced flow and clean-up integrated technology for offshore gas field[J].China Offshore Oil and Gas,2011,23(4):263-266.