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近钻头参数测量是地质导向技术的核心,钻头的井斜角表示出钻进的轨迹信息。传统的随钻测量仪器测量井斜等钻井参数的传感器探头安装位置距离钻头较远,不能及时反映钻头的钻进轨迹和钻遇地层信息,给钻井作业带来风险。测量传感器距离钻头越近,相应受到的振动、冲击、温度等环境影响越恶劣。基于MEMS加速度计的近钻头动态井斜测量单元是使用五轴MEMS加速度计的四舱室近钻头动态井斜测量单元,单元传感器探头距离钻头1 m以内,可以实时测量钻头的姿态和轨迹信息。采用镜像补偿测量和动态滤波的方法,滤除离心加速度、振动和冲击等对于测量值的影响,使得井斜静态测量精度在0.3°以内,动态测量精度控制在0.5°以内,满足随钻测井中高精度地质导向需求。
Near-bit parameter measurement is the core of geosteering technology, and the bit’s bevel shows the track information of drilling. Traditional MWD measurement instruments such as well inclination and other drilling parameters of the sensor probe installation location farther away from the drill bit, can not reflect the bit drilling trajectory and drill the formation of information in real time, to bring drilling operations risk. The closer the measuring sensor is to the drill bit, the worse the environmental impact such as vibration, impact and temperature is. The near-bit dynamic deviation detection unit based on MEMS accelerometer is a four-compartment near-bit dynamic deviation measurement unit using a five-axis MEMS accelerometer. The unit sensor probe is within 1 m of the drill bit and can measure the bit attitude and trajectory information in real time. The effects of centrifugal acceleration, vibration and impact on the measured values are filtered by mirror compensation measurement and dynamic filtering, so that the accuracy of well inclination static measurement is within 0.3 ° and the dynamic measurement accuracy is controlled within 0.5 °. High-precision geosteering needs.