深地塔科1井钻井设计关键技术

Key Technologies for Drilling Design of Well Shendi Take-1

深地塔科1井设计井深11100 m,预测井底温度213℃,预测地层压力133 MPa,钻井作业面临超深、超高温、超高压、高含硫“三超一高”的极端恶劣井况。通过开展地质工程一体化研究,确定了火成岩、膏盐岩及碳酸盐岩内裂缝的分布规律及其所带来的工程风险,在实现地质目标的前提下进行了井位优化,以降低工程施工难度。在地质工程一体化研究和五压力剖面预测的基础上,充分考虑深部地层地质、工程风险,设计了五开井身结构;开展了超深井套管设计及校核,除考虑套管抗拉强度、钻机承载力外,模拟计算了井口工具对超长超重套管的作用力,避免了套管下入过程中发生塑性变形;钻具组合设计时,充分考虑了水力学参数及振动的影响,在最优钻井参数范围内实现安全钻进和提速。现场施工进展表明,深地塔科1井钻井设计关键技术能够解决面临的系列钻井技术难点,实现万米钻探工程目标。

The design depth of Well Shendi Take-1 is 11100 meters,with a predicted bottom hole temperature of 213°C and a predicted formation pressure of 133 MPa.The drilling operation encounters exceptionally severe well conditions characterized by ultra deep,ultra-high temperature,ultra-high pressure,and high sulfur content.By conducting geological engineering,integration research,the distribution patterns of fractures in igneous rocks,gypsum salt rocks,and carbonate rocks and the engineering risks they bring were determined.The well positions were optimized to reduce the engineering difficulty while fulfilling geological objectives.Building upon comprehensive research in geological engineering intergration and prediction of five pressure profiles,this study meticulously considered the deep geological and engineering risks,and designed the five-section casing program.The design and verification of ultra-deep well casings were carried out.The tensile strength of the casing and the bearing capacity of the drilling rig were taken into consideration,and the force of wellhead tools on the ultra-long and overweight casing was simulated and calculated to avoid plastic deformation of the casing during the operation.Moreover,the design of the drilling tool assembly fully considered hydraulic parameters and vibration effects.This approach ensured safe drilling practices and facilitated speed enhancements within the the optimal drilling parameter range.On-site implementation progress demonstrates that the key technologies in drilling design for Well Shendi Take-1 can solve the drilling technical difficulties and achieve the goal of successful ultra-deep drilling at a depth of 10000meters.