近钻头随钻测量系统的研制与应用

Development and Application of Near-Bit Measurement While Drilling System

常规随钻测井系统测量点距离钻头较远,测量盲区大,无法及时准确判断钻头处倾角和地层岩性,为此,文章设计了一种具有自主知识产权的近钻头随钻测量系统,可以实时测量距离钻头1 m范围内的方位伽马和动态井斜角,同时采用了电磁波短传技术将测量数据跨螺杆传输给随钻测井系统,实现钻头在储层内的精确控制。现场应用表明,该仪器传输数据稳定、连续工作时间长,在煤层气井、页岩气井、薄油层井的水平段开采中,有效提高了目的层钻遇率及钻井速度,在水平井应用中具有较好的推广应用前景。

The conventional logging while drilling system is far away from the bit and has a large blind area,which makes it impossible to judge the dip angle and formation lithology in time accurately,therefore,a downhole near-bit measurement while drilling system with independent intellectual property rights is designed to solve these problems.The tool can measure the azimuth gamma and dynamic well inclination within 1 meter of the bit,and the measured data can be transmitted across the screw to the logging while drilling system by using electromagnetic wave short-transmission technology,which can realize the precise control of the drill bit in the reservoir.The field application shows that the instrument with the characteristics of stable data transmission and long continuous working time,which can effectively improve the drilling ratio and rate of penetration in the horizontal section exploitation of coalbed methane wells,shale gas wells and thin oil wells and has a good prospect for promotion and application in horizontal well applications.