高温高压高含硫地区超深井钻井难点及对策——以通南巴构造带为例

受特殊沉积环境及复杂构造运动的影响，在通南巴构造带上钻井工程事故频发，存在井漏、井壁垮塌、井涌（喷）、卡钻、高含硫化氢、岩石致密硬度大、井斜等问题，严重影响了安全、优质快速钻井。通过对通南巴构造带工程地质特征的研究，提出如下对策：①优选气体钻井、泡沫钻井、垂直钻井、复合钻井、旋转导向钻井等钻井方式，促进防斜打直、打快；②优化井身结构设计，合理确定必封点，科学确定井眼尺寸；③优化钻井液性能，提高防塌、润滑效果；④强化钻头选型，提高破岩效果；⑤细化防漏堵漏措施，减少非生产时间等。经现场钻井实践，大幅度地提高了机械钻速，有效地减少了钻井复杂情况，实现了该地区海相超深含硫气井的优快钻井，并对同类高温、高压、含硫气井的高效钻井具有借鉴意义。

Difficulties of ultra deep well drilling in HTHP sour fields and countermeasures: A case study in the Tongnanba tectonic belt

Due to the unique sedimentary environment and the complex tectonic movement, drilling accidents occur very frequently at the Tongnanba tectonic belt. Circulation loss, hole collapse, kicks, drill pipe sticking, high sulfur content, tight and hard rocks, and hole deviation are the problems to be faced, which have restricted the safe, fast and high-quality drilling operations. Based on the study of the geological characteristics of drilling engineering at the Tongnanba belt, it is proposed to adopt optimal ga...