摘要
川西地区具有井深、地层温度和压力高、压力系统多等特征,钻井过程中存在一系列技术难题:地层裂缝发育,裂缝分布难以预测,井控风险很大,尤其是又喷又漏的复杂井控问题突出;地层岩性纵向上砂泥岩、页岩、碳质页岩、薄煤岩互层频繁,井眼稳定性差;深层岩石致密、可钻性差,钻井周期长。这严重影响了川西深层的勘探开发进程。为此,西南油气分公司开展了深井钻井提速活动,针对川西地区地质构造复杂、喷漏故障发生概率高的情况,坚持"以防漏为主,堵漏为辅"的原则,根据地层和钻具等情况,采取相应的技术措施;针对钻具失效故障频发的情况,制定了保证下井钻具质量、优化钻具组合和钻井参数等技术措施;针对套管磨损,制定了优化井身结构设计和套管选型、提高钻井液润滑性能、使用非金属防磨套、保证井身质量等措施。川西地区采取以上技术措施后,井下复杂情况及故障显著减少,故障预防和处理水平得到了提高。
The wells in Western Sichuan are deep with high temperature and pressure,and the formation pressure system is complicated.The fracture is developed and its distribution is hard to describe.Well control is risky,especially with leak and blowout in same section.Sand,shale,carbonaceous shale and thin coal petrology are inter-bedded frequently,which causes poor borehole stability.The formation is tight with poor drillability.The long drill circle delays the exploration and exploitation of Chuanxi deep reservoir.In order to accelerate the exploitation,the research to improve ROP was conducted.Many technical measures were made to solve the blowout and leak.The problems of drilling tools failure and casing worn out were controlled.The measures include preventing and sealing leakage,optimizing BHA and drilling parameters to prevent BHA failure,optimizing casing program and casing type,lubricating mud,using nonmetal wearing bush,enhancing wellbore quality etc.
出处
《石油钻探技术》
CAS
北大核心
2010年第4期22-25,共4页
Petroleum Drilling Techniques
基金
中国石油化工股份有限公司项目"川西深井提高钻井速度配套技术应用研究"(编号:P08030)部分研究内容
关键词
深井
钻井事故
事故处理
川西地区
deep well
drilling accident
accident treatment
Western Sichuan Area
