南海高温高压气田开发钻完井关键技术现状及展望

海上高温高压气田开发是一项高投入、高风险、高难度的大型海上系统工程活动。针对南海西部高温高压气田的基本特征，分析了南海西部高温高压气田开发在井筒安全、钻完井液、固井、定向井和水平井钻井、钻井综合提速、完井等方面面临的技术难点，并系统总结了目前已形成的油套管综合防腐、“五防”固井水泥浆和自修复水泥浆、超压盖层提速、储层精细保护、定向井轨迹控制以及安全完井等高温高压钻完井关键技术。随着南海高温高压勘探领域进一步拓展，当前正面临超高温高压、深水高温高压环境的巨大挑战，提出未来海上高温高压天然气开发钻完井技术应加强能适应更高温压等级的设备、材料、新工艺技术的研发以及完善海上应急救援体系，保障海上高温高压钻井的安全和高效。

Status and prospect of key drilling and completion technologies for the development of HTHP gasfield in South China Sea

The development of offshore HTHP gas fields is the large-scale offshore system engineering with high investment, high risk and high difficulty. In this paper, the basic characteristics of HTHP gas fields in western South China Sea were investigated, and then the corresponding technical difficulties during their development were analyzed from the aspects of wellbore safety, drilling and completion fluid, cementing, directional well and horizontal well drilling, composite drilling speed improvement and well completion. The key HTHP well drilling and completion technologies which had been developed were summarized systematically, including composite anti-corrosion of tubing and casing, “five-prevention” cementing slurry and self-repairing slurry, overpressure cap rock ROP improvement, fine reservoir protection, directional well trajectory control and safe well completion. As the HTHP exploration field is expanded further in the South China Sea, huge challenges emerge in HTHP and deepwater HTHP environments. Faced with these challenges, it is proposed that the drilling and completion technologies for offshore HTHP natural gas development shall focus on the research and development of new equipments, materials and technologies that are suitable for higher temperature and pressure and the completion of offshore emergency rescue system, so as to ensure the safety and efficiency of offshore HTHP well drilling.