东海深井探井钻井提速配套技术及其应用

随着东海油气资源勘探逐渐向深层发展,探井钻井作业深度不断增加,对原井身结构进行了优化。井身结构的变化使上部444.5 mm大尺寸井眼加深至2400 m,下部地层岩石硬度和强度增加使地层可钻性变差,机械钻速明显下降,导致钻井周期长,钻井成本高,因此,亟需钻井提速技术研究应用。针对难点,通过优选钻头和钻井方式,以及改进钻井液的应用,形成了上部444.5 mm井段快速钻进技术;下部井段通过智能录井钻井参数监控技术及时优化调整参数,分析选用了扭冲工具进行钻井提速,形成了下部井段钻井提速配套技术。现场试验应用表明,钻井提速效果十分明显。大尺寸复合钻井、扭冲工具、智能录井钻井参数监控等技术在该区可全面推广应用。

Matching Technologies and Their Application for Increasing Drilling Speed in Deep Exploratory Well in East China Sea

The oil and gas exploration in the East China Sea has changed gradually into the deep depth, and the drilling depth of exploratory well is increasing constantly. Therefore, it is necessary to optimize the original casing program. The casing program has changed, with 444.5 mm large size hole deepen to 2400 m, and the rock hardness and strength in deep well increase. Thus, the formation drillability became poor, which leaded to a decreasing obviously in drilling rate, a long drilling cycle and high drilling cost. Therefore it is urgent to conduct a study on the technology for increasing drilling speed and its application. To overcome these difficulties, by optimizing bit, drilling method and improving the drilling fluid, the fast drilling technology has been developed for the upper 444.5 mm hole section. In the lower hole section, intelligent logging real-time monitoring technology has been used to optimize and adjust timely the drilling parameters and the torsional drilling tool was chosen to increase drilling speed, which formed matching technology for increasing drilling speed in the lower section of hole. The field application results indicated that the drilling rate was speeded up significantly. The large size composite drilling technology, torsional drilling tool, and intelligent borehole logging technology for monitoring drilling parameters can be fully applied in the area.