随钻方位伽马探管的设计

传统随钻伽马仪器测量井眼周围的伽马值,测量曲线反映与井眼垂直的地层信息,在定向井及水平井钻井过程中,由于本身没有方位信息,不能及时有效确定层位及井眼轨迹变化。针对此问题,研制开发了随钻方位伽马探管,该探管测量数据通过MWD实时传输到地面,结合井深数据生成方位伽马曲线,曲线不仅反映地层信息,而且能够分辨上下界面岩性特征,有效发现储集层的上部盖层,捕捉进入油气储集层的最佳时机。随钻方位伽马探管在多个区块随钻地质导向的现场应用表明,其适合在石油钻井工程中用于进行地质导向。

Design of an azimuthal gamma probe while drilling

The logging curve of the gamma value around the borehole by traditional gamma-while-drilling tools reflects the formation information perpendicular to the borehole.In the drilling of directional well and horizontal well,the horizon and well trajectory changes cannot be effectively determined in time since the lack of azimuth information.An azimuthal gamma probe while drilling is developed as to this problem.The probe transmits the logging data to the ground in real time through MWD to generate azimuthal gamma curves that not only reflect the formation information,but also distinguish the lithological characteristics of the upper and lower interfaces,effectively discover the upper caprock of the reservoir,and capture the best time to enter the oil and gas reservoir combined with the data of well depth.The field application of the azimuthal gamma probe while drilling in the geosteering while drilling in multiple blocks shows that it is suitable for geosteering in petroleum engineering.