摘要
川东北地区地层裂缝和孔洞发育,且以纵向裂缝为主,漏失层位多,钻井过程中经常发生井漏,同时由于两个或多个压力系数相差较大的地层并存于同一裸眼井段,钻开高压气层前的承压堵漏及固井施工前的承压堵漏工作难度大,周期长。分析了目前国内外堵漏技术的机理,提出了有效解决川东北地区井漏的处理方法和堵漏措施,包括:严把设计关,合理设计井身结构、水泥浆密度和地层承压要求;加强技术交流,相互借鉴,提高川东北地区的防漏堵漏和承压堵漏整体水平;利用专业化公司,采用堵漏新技术、新工艺,提高堵漏成功率。以双庙101井和马2井为例,介绍了川东北地区井漏的特征及相应的防漏、堵漏、承压堵漏技术措施,并对该地区承压堵漏技术的发展提出了建议:开发或引进抗压强度高于12 MPa以上、抗温高于120℃的桥堵材料,对承压要求高的多段漏失地层采用纤维水泥或膨胀性高强度可固化凝胶分段堵漏,制定出适合不同井漏的堵漏施工方案和工艺技术等。
Formation fractures and caves in Northeast Sichuan area and features are developed with mainly longitudinal fractures and a lot of thief zones, therefore, lost circulation occur frequently. In addition, plugging under pressure before drilling the high pressure gas zone and cementing operations are diffi- cult and require long time resulting from different formation pore-pressures in one formation penetrated by one wellbore. In this paper, mechanisms of plugging techniques are analyzed in detail, measures to solve circulation loss and plug are proposed, including reasonable casing design, selection of cement slurry, de- termination of formation strength, enhancing technology exchange, employing novel plugging technologies and professional company, etc. Wells Shuangmiao-101 and Ma-2 are introduced to illustrate the circulation loss prevention, plugging, and plugging under pressure in Northeast Sichuan area. The suggestions are provided, including developing or using lost circulation materials suitable for pressures over 12MPa, temperatures over 120℃, using high-pressure fiber cement and expandable high-strength cured gels for formation with higher pressure requirement, determining proper plugging procedures and techniques for different lost circulation.
出处
《石油钻探技术》
CAS
北大核心
2008年第3期20-23,共4页
Petroleum Drilling Techniques
关键词
井漏
堵漏
承压能力
川东北地区
lost circulation
lost circulation control
resistance to pressure
Northeastern Sichuan area
