超高温高压井取心技术在LD13井的应用

Application of Coring Technology in Ultra High Temperature and High Pressure Well In Well LD13

海上超高温高压井由于超高地层温度超高地层压力、压力窗口极窄等特点,作业难度较高,在超高温高压井段取心,存在井控风险高、易井漏等高风险,是一项难度极高的作业。该文分析了在超高温高压井段取心的技术难点,从而对取心筒改进、钻具组合和钻进参数优选、井控措施、防漏措施进行研究,提出取心筒改进方案、推荐钻具组合和钻进参数、井控措施和防漏措施,并首次在LD13超高温高压井实践中得到了应用。施工中采用改造后的取心筒,控制住了井控风险,避免了井漏,并最终取得100%取心收获率,在南海海上超高温高压井段取心作业圆满完成,应用效果明显,可为海上超高温高压井段取心提供有效参考和借鉴。

The operation of offshore ultra-high temperature and pressure wells is difficult due to the characteristics of ultra-high formation temperature, ultra-high formation pressure and the extremely narrow pressure window. Coring in ultra-high temperature and pressure well sections involves high risks such as well control and lost circulation, so it is a very difficult operation. This paper analyzes the technical difficulties of coring in the ultra-high temperature and high pressure well section, so as to study the coring barrel, drilling tool assembly, drilling parameter optimization, well control measures and leakage prevention measures, and puts forward the improvement plan of the coring barrel, recommended drilling tool assembly and drilling parameters, well control measures and leakage prevention measures, which have been applied in the practice of Well LD13 with the ultra-high temperature and high pressure for the first time. The reconstructed coring barrel was used in the construction, which controlled the well control risk, avoided lost circulation, and finally achieved 100% coring recovery. The coring operation in the offshore ultra-high temperature and high pressure well section of South China Sea was successfully completed. The application effect is obvious, which can provide effective reference for coring in the offshore ultra-high temperature and high pressure well section.