Near-bit geo steering drilling technique
1.Short blind area measurement, Zero-Length measurement 2-3cm, Near- bit resistivity can measure within 0.7m.
￭ Geological parameters: drill resistivity, azimuth resistivity, natural gamma ray
￭ Engineering parameters: well deviation, tool face
2. High resolution instrument, quick data transmission (50-60S)
3. Has strong signal processing and recognition capacity, the signal can pass through more than 4500m.
4. Working temperature 125℃（257℉）, pressure 140MPa，continuous operation time ≥ 200h.
Conventional LWD (MWD) sensor is mounted on the screw drill inside the non- magnetic drill collar.
From Resistivity Probe Point to the drill 8-9m.
From Gamma ray measure point to drill 13-15m.
From Well deviation, azimuth measure point to drill 17-21m.