Geosteering Resistivity Tool Specifications

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Geosteering Resistivity Tool Specifications
Operational Specifications
Types of Measurement	LWD Average Resistivity Log (ResB), and Real-time Resistivity Vector : Magnitude (ResV) + Angle (ResA), and Gamma-ray or Focused Gamma
Average Resistivity Range/Accuracy	0.2 to 20,000 Ω-m., +/-10% (worst-case), +/-1.5% (if borehole is on-gauge)
Thin-Bed Resolution	17 cm / 6.75 inches
Maximum Operating Temperature	150 °C / 300 °F
Maximum Pressure	1400 bar / 20,000 PSI
Detection Distance for Parallel Rock Formation Boundary	> 1 meter / 40 inches with >10:1 resistivity contrast
Depth of Investigation (Invasion Tolerance)	0.64 meter / 25 inches diameter @ 50% point on PGF curve
Internal Memory	400 hour (16.7 day) log including all resistivity, gamma and diagnostic data. Data are recorded every 4 seconds and can be downloaded through a high-speed port.
Mechanical Specifications for 4-3/4 inch version
Tool Makeup Length	3.47 meters / 11.34 feet
Nominal Outside Diameter	121 mm. / 4.75 inches
Wear Band Diameter	140 mm. / 5.5 inches
Tool Connections	A.P.I. 3.5 inch IF, box upper/pin lower
Maximum Mud Flow Volume	330 Gallons/Minute @ 50 feet/second flow rate
Maximum Dogleg Severity	Rotating 15°/100 feet, Sliding 20°/100 feet
Electrical Connections	6-pin Rotary, male upper/female lower
Toolface / Directional Package Orientation	Muleshoe Helix built into upper box connection
Mechanical Specifications for 6-1/2 inch version
Tool Makeup Length	3.52 meters / 11.54 feet
Nominal Outside Diameter	165 mm. / 6.5 inches
Wear-Band Diameter	190 mm. / 7.5 inches
Tool Connections	A.P.I. 4.5 inch IF, box upper/pin lower
Maximum Mud Flow Volume	870 Gallons/Minute @ 50 feet/second flow rate
Maximum Dogleg Severity	Rotating 10°/100 feet, Sliding 15°/100 feet
Electrical Connections	6-pin Rotary, male upper/female lower
Toolface / Directional Package Orientation	Muleshoe Helix built into upper box connection
Measurement-Point position from Lower Shoulder
Resistivity	0.715 meters / 28.16 inches
Gamma-ray	1.54 meters / 60.62 inches
Power Requirements
Power Source	External Lithium Battery Pack (14.4V to 28.8V nominal)
Battery Life	200 hours with one 28.8 volt Battery Pack (50% duty cycle)
Real-time Output Data
Serial ASCII format	+5V., 9600 Baud