莺歌海盆地中深层高温高压钻井关键技术及其实践效果

Key technology and application of HTHP drilling in mid-deep formations in Yinggehai basin

针对莺歌海盆地中深层高温高压钻井过程中存在的地层压力预测精度低、井身结构要求高、高压井段泥饼质量差、粘塑性地层可钻性差等难题,通过多机制复合计算方法预测地层压力、井身结构优化、套管选材、机械钻速提高、钻井液优化等关键技术研究,形成了一套适用于该地区中深层高温高压钻井技术体系,已在该地区中深层19口高温高压井的钻井作业中成功应用,实现了钻井作业时效高、事故率低、费用控制合理的目标。目前这一技术体系已推广到琼东南盆地高温高压钻井作业中,可为今后类似地区高温高压井的钻井作业提供借鉴。

Aiming at the technical difficulties in the HTHP drilling operations in mid-deep formations of Yinggehai basin, such as the low accuracy in pressure prediction, high requirements on wellbore structure, poor mud cake quality along high pressure hole intervals, poor drillability of viseoplastic formations, com- pounded research in multiple-mechanism prediction of formation pressure, casing program optimization, casing material selection, ROP improvement and drilling fluid optimization was conducted, and an inte- grated system of drilling technology suitable for HTHP mid-deep formations was developed. It has been successfully applied for HTHP formations in 19 wells, with high drilling efficiency, low accident rate and reasonable cost control goals achieved. Currently, the technology system has been disseminated to HTHP formations in Qiongdongnan basin and provides a reference for HTHP drilling operations in other similar regions in the future.