Near-bit Dual Detector
The ORT-NBGS-Ⅱ geological steering tool is our company’s second-generation near-bit product, consisting of a measurement sub, dedicated motor, wired communication system, and MWD component.
The primary advantage of the second-generation product is the near-bit measurement of all parameters (except azimuth), with gamma and resistivity integrated into a single sub, achieving a measurement blind zone ≤0.4m, making it a true near-bit geological steering instrument.
Table 1
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Near bit-system parameters |
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Communication with MWD |
Electromagnetic coupling wireless communication |
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Communication rate with MWD |
9600bps |
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Power Supply Form/Endurance |
Battery pack/500h |
Table 2
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Near bit-near bit azimuth gamma and near drill inclination |
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Project |
Parameters |
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Gamma measurement range (API) |
0-500 |
Accuracy |
± 2% |
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Azimuth gamma detection depth |
12in |
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Azimuth gamma vertical resolution |
4in |
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Range of deviation measurement near bit |
0-180 ° |
Accuracy (static) |
± 0.1 ° |
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Accuracy (dynamic) |
± 0.3 ° |
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Maximum working temperature (℃) |
150 ℃/175 ℃ |
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Maximum working pressure (MPa) |
140MPa |
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Seismic and impact resistance |
Anti-vibration: 20grms5Hz ~ 300Hz (random); 30g5Hz ~ 300Hz (sinusoidal); anti-shock: 1000g/0.5ms |
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Short section length |
495mm |
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Distance from measuring point to bit (m) |
0.4m (azimuth gamma) 0.4m (well deviation) |
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Upload Curve |
Can set 2, 4 respectively: up, down or up, down, left, right |
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Table 3
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Near bit-near drill resistivity |
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Project |
Parameters |
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Operating frequency |
2MHz |
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Measurement range |
2MHz:0.2~2000Ω.m |
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Measurement accuracy |
Phase Resistivity (2MHz:± 2% @(0.2-2000 Ω.m) Amplitude Resistivity (2MHz):± 5% @(0.1-200 Ω.m) |
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Vertical Resolution |
150mm |
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Resistivity probe depth (Rt-10Ω.m) |
800mm |
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Maximum working temperature (℃) |
150 ℃/175 ℃ |
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Maximum working pressure (MPa) |
140MPa |
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Distance from measuring point to bit (m) |
300mm |
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Upload Curve |
High frequency phase resistivity 1 bar |
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