川东北地区优快钻井配套技术

川东地区构造带大多属于高陡背斜构造，地层倾角大，研磨性强，可钻性差，地下断层、裂缝、溶洞发育、井漏频繁，稳定性差，存在多套压力体系、安全窗口窄，且目的层地层压力预测难度大，具有“高压、高产、高含硫”的“三高”特点，所以钻井难度大，施工风险高，一直制约着钻井速度的提高。自中国石化实施川气东送建设工程以来，完善了针对川东北地区钻井的28项新标准，有针对性地开展了多项技术难题攻关；解决制约钻井提速提效的部分瓶塞技术，形成了井身结构优化、防斜打直新技术、快速钻井新技术、钻井液防塌技术、综合防漏新技术和井控安全技术六项综合配套的优快钻井技术。用这些技术指导现场生产，进一步提高了钻井效率，降低了钻井风险，并指出了急待攻关解决的关键技术，为加快勘探开发工作提供了有效的钻井保证。

Application of the Optimum Drilling Technique in the Northeast Area of Sichuan

The structural belt of the northeast area of Sichuan mostly belong to the high angle-anticline, it has some features, such as large stratigraphic dip, strong rock abrasive property, poor drillabillity, and the faultages,developed fractures and the solution cavity, so the lost circulations are frequent, and the stability of the formation is poor. And there are many pressure systems, the safety pressure windows is narrow, besides these, this area have "high pressure, high production, high sourness" features, all these restrict the drilling speed. From the "transporting the gas of Sichuan to the east area" project of the Sinopec was brought into effect, 28 new technical standards aimed at the drilling technique of the northeast area of Sichuan have been perfected. Some bottle-neck techniques which were restricting the drilling speed were solved. Six comprehensive optimum drilling techniques about casing program optimum, deviation control, fast drilling, anti-sloughing mud, leak protection and stop water loss, and well control safety were formed. These techniques have been used in the field drilling operation, raising the drilling efficiency and reducing the risk.