Product Details

Specifications

1.China Geosteering Drilling System Near-Bit
2.high quality , competitive price and delivery fast
3.Made in China

Product Name:
CGDS NB (China Geosteering Drilling System Near-Bit)
Product Explanation:
CGDS NB consists of CAIMS (China Adjustable Instrumented Motor System), WLRS (Wireless Receiver System), CGMWD (ChinaGeosteering MWD) and CFDS (China Formation/Drilling Software System). Integrating the technology of drilling, logging and reservoir engineering, Near-bit Geosteering Drilling System provides near-bit geological and engineering parameters and controlling method while drilling to ensure that the well bore passes through reservoir and is best located. The borehole trajectory can be adjusted and controlled in real time according to the formation features measured by CGDS NB as the drilling bits are equipped with “eyes”, which can identify oil/gas layer during drilling.
Product Features:

Measuring Near-bit geological parameters (bit receptivity, azimuthally receptivity, and natural gamma) and near-bit engineering parameters (inclination, tool face) are measured and the information is sent by wireless transmission technology to the receiving system across steering motor.

Transmitting Near-bit information is integrated into the positive pulsar in CGMWD by data connection system, and CGMWD is used as information transmission channel to send the measured down hole information (partial) to surface processing system for orientation decision.

Steering Down hole motor is used as the steering tool. CFDS processes and analyzes real-time near-bit geological parameters to interpret and identify the nature of newly drilled formation, then, undertakes necessary re-adjustment and control while drilling, directs the steering tool into objective oil/gas layer or continues drilling in the oil layer.

Be applied to geological exploration directly and increase the discovery rate of prospecting wells.

Be suitable for the development wells in complicated formation or thin oil layer and increase the probability of penetration and recovery rate.

Reduce drilling costs, increase production and economic profit.

Product types and specifications:

CGDS NB General Specification
Description	Specification
Description	CGDS172NB	CGDS203NB
Outside Diameter	f172 mm	f203 mm
Max. Outside Diameter	f190 mm	f215 mm
Borehole Size	f216~f244 mm (8-1/2²~9-5/8²)	f241~f311mm (9-1/2²~9-5/8²)
Built Ability	medium and long radius	medium and long radius
Transmission Depth	more than 4500m	more than 4500m
Max. Temperature	125°C	125°C
Type of Pulse Generator	mud positive pulse	mud positive pulse
Upload Transmission Rate	5 bit/s	5 bit/s
Short Pass Data Rate	200 bit/s	200 bit/s
Continuous Operating Time	200 h	200 h
Near-bit Measurement Parameters	Bit resistivity, azimuthal resistivity, azimuthal gamma, inclination, tool face angle, temperature	Bit resistivity, azimuthal resistivity, azimuthal gamma, inclination, tool face angle, temperature
Max. Pressure	140 MPa	140 MPa
Max. Impact	10000 m/s²(0.2ms,1/2sin)	10000 m/s²(0.2ms,1/2sin)
Max. Vibration	150 m/s²(10~200Hz)	150 m/s²(10~200Hz)
Motor Flow Rate	19 L/s ~38 L/s	19 L/s ~38 L/s
Motor Pressure-drop	3.2 MPa	3.2 MPa
Bit Rotation	100 ~200 r/min	90 ~160 r/min
Torque of Motor	3660 Nm	5000 Nm
Max. Motor Torque	5600Nm	8750Nm
Recommended WOB	80 kN	120 kN
Max. WOB	160 kN	160 kN
Motor Power	38.3 kW ~76.6kW	38.3 kW ~78.5kW
Distance between Bit Resistivity Sensor and Thread shoulder of Bit	2.05 m	2.23 m
Distance between Azimuthal Resistivity Sensor and Thread shoulder of Bit	2.53 m	2.71 m
Distance between Azimuthal Natural Gamma Sensor and Thread shoulder of Bit	2.70 m	2.88 m
Distance between Inclination/Tool face Sensor and Thread shoulder of Bit	2.85 m	3.03 m
CAIMS Length	8.4m	9.1m
WLRS Length	1.94 m	1.94 m
CGMWD Length	7.85 m	7.85 m
Total CGDS NB Length	18.2m	18.9m
Thread Connection	upper end: 4 1/2IF (4 IF) lower end: 4 1/2REG	upper end: 6 5/8 REG lower end: 6 5/8 REG
CGMWD
Description	Measurement Range	Accuracy
Azimuth	0°~360°	Inclination³6°, ±1° Inclination: 3°~6°, ±1.5° Inclination: 0°~3°, ±2
Inclination	0°~180°	±0.15°
Tool-face	0°~360°	Inclination³6°, ±1.5° Inclination: 3°~6°, ±2.5° Inclination: 0°~3°, ±3°
Temperature	0°~150°	2.5°C
Shock resistance	200m/s², 5 Hz ~1000Hz at random
Impact resistance	5000m/s² (0.2ms,1/2sin)
Max. pressure	140MPa
Max. temperature	125°C
Max. sand content	1%
Max. dogleg	10°/30m(rotary),20°/30m(slip)
Max. bit pressure drop	No limited
Bit Resistivity
Water Base Mud	Measure range	0.2 W.m ~2000 W.m
	Measure accuracy	±0.1W-m (Resistivity≤2W.m)
		±8%FS(2W.m<RESISTIVITY≤200W.M)< div>
		±15%FS (Resistivity>200W.m)
	Vertical resolution	Typical value 1.8m (6ft)
	Depth of investigation	0.45m (18in)
	Max. temperature	125°C
	Max. pressure	140MPa
Oil Base Mud	Measure range	0.2 W.m ~2000W.m
	Measure accuracy	±0.1W.m (Resistivity≤2W.m)
		±7%FS (2W.m<RESISTIVITY≤200W.M)< div>
		±12%FS (Resistivity>200W.m)
Azimuthal Resistivity
Water Base Oil	Measure range	0.2 W-m ~200W.m
	Measure accuracy	±0.1W-m (resistivit≤2W.m)
	Measure accuracy	±8%FS (resistivity>2W.m)
	Vertical resolution	Typical value 0.1m (4in)
	Depth of investigation	0.3m (12in)
	Max. temperature	125°C
	Max. pressure	140MPa
Natural Gamma
No.	Description	Accuracy
1	Measurement range	0~250API
2	Accuracy	±3%FS
3	Sensitivity	≤ 4API/cps
4	Max. measurement rate	30m/h
5	Formation resolution	20cm
6	Statistical variation (*)	±3API
Near-bit Inclination, Tool Face
Description	Range	Accuracy
Tool face angle	0°~360°	±0.4°
Inclination	0°~180°	±0.4°

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