第40卷第1期
天然气勘探与开发
工程与管理
及时封堵钻井液体系在低承压地层中的优化与运用
孙月明1贺立勤！瑶佳依？汪正伍丨胡殊睿！
张诗培丨张琴丨李金洋！
1.中国石油川庆钻操工程有限公司川西钻探公司2.中国石油川庆钻探工程有限公司钻井液技术服务公司
摘要随着超深井钻井技术的成熟，钻探目的层越来越深，钻进中穿越裸眼井段长度不断增加，超过1000m的棵眼钻进中因地层跨度大，地层压力系数差异大，若钻井液选择不当，易造成低承压地层井漏、较高承压地层烤爆、井壁失稳等复杂情况。针对同一裸眼段中不同层位所对应的不同地质情况，优选钻井液性能对顺利宪钻至关重要。以四川盘地西北部双鱼石一河湾场构造ST2井为研究对象，针对该井钻进中穿越中保罗统须家河组一中三叠统雷口披组大段裸眼地层，地层承压能力差异大，井下情况复杂，力求寻找一种性能稳定，适用于同一裸眼中不同层位的钻液体系。在综合钾聚磺钻井液体系和及时封堵钻并液（JSF）体系的基确上，通过优化钻井液配方、调整钻并液性能，合理使用固控设备等方面入手，优化改进了传统的JFS体系，在ST2并三开钻进中取得显著效果。现场应用表明：优化的JSF体系在长裸眼井段中有着良好的稳定井壁、携砂、润滑等特性，降低了并下复杂的发生率，缩短了施工周期，具有明显的经济效益。
2低承压地层易漏并壁失稳及时封堵钻井液体系
关键字
性能优化固控设备及时封堵
香防塌
low-pressureformation
Sun Yueming', He Liqin', Yao Jiayi', Wang Zhengwu', Hu Shurui', Zhang Shipei', Zhang Qin', Li Jinyang
(I.West SichuanDrillingCompany,CNPC ChuanqingDrillingEngineering Company Limited, Chengdu,Sichuan 610051,China; 2.DrillingFluid Technology Service Company,CNPC ChuanqingDrillingEngineering Company Limited,Chengdu,Sichuan610051,China)
Abstraet: As the ultra deep well drilling technologies get mature, drilling operation targets at deeper layers, and correspondingly the drilling length of open hole interval increases. During the open hole drilling over 1000 m long, the formation span is large and the formation pressure coefficient varies greatly. Therefore, improper application of drilling fluids may lead to several complexities, such as circulation loss in low-pressure formation, collapse of high-pressure formation and borehole instability. In order to carry out well drilling smoothly, it is crucial to optimize the performance of drilling fluid according to the geological characteristics of horizons in
er, Well ST2 at the Shuangyushi-Hewanchang structure in northwestern Sichuan Basin was tak-
the same open hole interval. In this pape
Kample. It runs through a long open hole strata of Middle Jurassic Xujiahe Formation-Middle Triassic Leikoupo Formation,
cnasanex
where downhole situ
systemthat drilling fluid s
suitablefordiffe
K with larger differences in formation pressure, so it is necessary to search for a drilling fluid
ame open hole interval.Based on the combination of potassium polysulfonate
, the traditional JFS system was improved by optimizing the formula of drilling fluid, adjusting
e of drilling fluid and using the solid control equipment rationally. The optimized JFS system was successfully applied
theperformanc
in the third section of Well ST2. It is indicated that this optimized JFS system is capable of borehole stabilization, proppant carrying and lubricating in long open hole intervals, With this system, the downhole complexity probability is reduced, and the operation time is shortened, corresponding to remarkable economic benefits.
Keywords: Low-pressure formation; Thief zone; Borehole instability; Plugging immediately drilling fluid system; Performance opti mization; Solid control equipment; Timely plugging; Sloughing prevention
第一作者简介：孙月明，1991年生，助理工程师；现从事钻井液技术管理工作，地址：（610051）四川省成都市成华区三友路 213号川西钻探公司。电话：13883166759。E-mail:sunyuemingcnpc.com.cn
·101·
万方数据