摘要
为解决油基钻井液在页岩气水平井中应用时带来的环保问题和钻井液处理成本较高的问题,通过室内实验优选出了性能优良的封堵剂、抑制剂和润滑剂,并结合其他处理剂,研究出一套适合页岩气水平井的防塌水基钻井液体系,室内对其综合性能进行了评价。结果表明:钻井液体系经过130℃老化后,其流变性能稳定、滤失量较小,具有良好的耐温性能;钻井液体系低渗砂盘封堵实验的瞬时滤失量和静态滤失速率分别为0.6 mL和0.33 mL/min,具有良好的封堵性能;钻井液体系的抑制性能和润滑性能与现场油基钻井液体系基本相当,能够很好的起到抑制页岩水化分散和降低摩擦阻力的作用;另外,钻井液体系中加入20%NaCl、2%CaCl_(2)和20%岩屑后,体系老化前后的流变性能和滤失量变化均不大,说明体系具有较强的抗污染能力。现场应用结果表明,使用防塌水基钻井液施工的X-101井钻井过程顺利,各项施工参数均达到设计要求,并且与前期已钻井X-3HM井相比,钻井周期、井下复杂时间以及平均井径扩大率均明显降低,水平段钻速明显提高,达到了良好的钻井效果。
In order to solve the problems of environmental protection and high cost of drilling fluid treatment caused by the application of oil-based drilling fluid in shale gas horizontal wells,plugging agents,inhibitors and lubricants with excellent performances were selected through laboratory experiments,and an anti-sloughing water-based drilling fluid system suitable for shale gas horizontal wells was developed in combination with other treatment agents,and its comprehensive performance was evaluated in the laboratory.The results show that after aging at 130℃,the rheological property of the drilling fluid system is stable,the filtration capacity is small,and it has good temperature resistance.The instantaneous filtration rates and static filtration rates of the plugging experiment of the low permeability sand pan of the drilling fluid system are 0.6 mL and 0.33 mL/min,respectively,which have good plugging performance.The inhibition and lubrication performance of the drilling fluid system are basically the same as that of the field oil-based drilling fluid system In addition,when 20%NaCl,2%CaCl_(2)and 20%cuttings are added into the drilling fluid system,the rheological properties and filtration capacity of the system before and after aging do not change much,indicating that the system has strong anti-pollution ability.The field application results show that the drilling process of well X-101 using the new anti-sloughing water-based drilling fluid is smooth,all construction parameters meet the design requirements,and compared with the previously drilled well X-3HM,the drilling cycle,downhole complex time and average well diameter expansion rate are significantly reduced,and the drilling speed in the horizontal section is significantly improved,achieving good drilling results.
作者
杨加伟
熊青山
吴胜
李成龙
刘恒
YANG Jia-wei;XIONG Qing-shan;WU Sheng;LI Cheng-long;LIU Heng(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China)
出处
《科学技术与工程》
北大核心
2021年第12期4891-4896,共6页
Science Technology and Engineering
基金
国家科技重大专项(2016ZX05043,2016ZX05025-004-003)。
关键词
页岩气储层
水平井
水基钻井液
封堵性
抑制性
shale gas reservoir
horizontal well
water-based drilling fluid
plugging
inhibition
