川西海相超深大斜度井井身结构优化及钻井配套技术  

Casing Program Optimization and Drilling Matching Technologies for Marine Ultra-Deep Highly Deviated Wells in Western Sichuan

作　　者：胡大梁[1] 欧彪[1] 何龙[2] 肖国益[1] 李文生[2] 唐宇祥[3] HU Daliang;OU Biao;HE Long;XIAO Guoyi;LI Wensheng;TANG Yuxiang(Petroleum Engineering Technology Institute,Sinopec Southwest Oil&Gas Company,Deyang,Sichuan,618000,China;Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan,610041,China;Pengzhou Gas Field Department of Sinopec Southwest Oil&Gas Company,Pengzhou,Sichuan,611930,China)

机构地区：[1]中国石化西南油气分公司石油工程技术研究院,四川德阳618000 [2]中国石化西南油气分公司,四川成都610041 [3]中国石化西南油气分公司彭州气田(海相)开发项目部,四川彭州611930

出　　处：《石油钻探技术》2020年第3期22-28,共7页Petroleum Drilling Techniques

基　　金：国家科技重大专项课题“复杂地层钻井提速提效关键工具与装备”(编号:2016ZX05021-003);“低渗油气藏钻井液完井液及储层保护技术”(编号:2016ZX05021-004)部分研究成果。

摘　　要：川西气田海相雷口坡组气藏埋藏超深、地质条件复杂,前期采用的四开井身结构难以满足钻井提速和经济高效开发的要求。通过分析工程地质特征,在保证雷口坡组专层专打的基础上,基于地层三压力剖面和井壁稳定性研究结果优化了必封点位置,设计了超深大斜度井三开井身结构。结合地层岩性特点,优化设计了井眼轨道,进行了高研磨性地层定向钻头和配套工具的优选,研制了复合盐强抑制聚磺防塌钻井液和强封堵高酸溶聚磺钻井液。超深大斜度井三开井身结构及钻井配套技术在PZ4-2D井进行了现场试验,解决了长裸眼复杂地层的井眼失稳问题,完钻井深6 573.77 m,钻井周期199.3 d,平均机械钻速3.53 m/h,提速40%以上。现场试验结果表明,三开井身结构设计科学、合理,钻井配套技术提速效果显著,可在川西气田海相气藏大斜度井钻井中推广应用。The marine gas reservoirs in Leikoupo Formation of the Western Sichuan Gas Field have extreme burial depths and complex geological conditions,and the four-stage casing program that was previously used cannot meet the requirements of a faster drilling pace and cost-effective development.By analyzing the engineering geological characteristics and on the basis of ensuring the specific layer drilling in the Leikoupo Formation,the positions of mandatory sealing points were optimized according to the results of formation three-pressure profile and borehole stability studies.Based on that,an ultra-deep highly deviated well three-stage casing program was designed.Combined with the lithological characteristics of this formation,we optimized highly deviated borehole trajectory and directional bits and support tools so that that would work well in high-abrasive strata.Further,we developed both an anticollapsing drilling fluid with compound salt strong inhibition polysulfide and a high acid solution polysulfide drilling fluid with strong plugging performance.The three-stage casing program for ultra-deep highly deviated well and the associated drilling technologies was tested in Well PZ4-2D,which effectively solved the problem of borehole instability in long open-hole complex formation.The total depth reached 6573.77 m,in a drilling period of 199.3 days,with an average ROP is 3.53 m/h.The drilling speed increased more than 40%.The results of field test showed that the design of three-stage casing program was scientific and reasonable,and the associated drilling technologies were effective in increasing the drilling rate significantly,which provided technical support for the subsequent drilling of highly deviated wells in the marine gas reservoirs of the Western Sichuan Gas Field.

关 键 词：大斜度井 井身结构优化 钻井 雷口坡组 海相 川西气田 

分 类 号：TE243.2[石油与天然气工程—油气井工程]