MWD-System

MWD-systems are used for geosteering and logging while drilling.

Geosteering and logging support while drilling include the following specifications:

  • Zenith angle;
  • Azimuth angle;
  • Tool face orientation (TFO);
  • Surrounding rocks natural radioactivity;

Well temperature.

MWD Specifications:

DrillTek MWD
Tensor Elite MWD
Description Specifications
Total MWD length
10.11 m – Downhole MWD-System assembly with Gamma module 8.8 m - Downhole MWD-System assembly without Gamma module
10,8 m – Downhole MWD-System assembly with Gamma module 9,79 m - Downhole MWD-System assembly without Gamma module
MWD tools outside diameter
47,6 mm ( 1,875 in)
47,6 mm ( 1,875 in)
Tool survey offset
4.48 m – Downhole MWD-System assembly with Gamma module 3.17 m - Downhole MWD-System assembly without Gamma module
4.48 m – Downhole MWD-System assembly with Gamma module 3.17 m - Downhole MWD-System assembly without Gamma module
Tool gamma offset
3.03 m – Downhole MWD-System assembly with Gamma module
3.03 m – Downhole MWD-System assembly with Gamma module
Power source
Heat resistant 27 V lithium batteries, one battery operation time is 400-500 hours *(MWD has main and backup batteries).
Heat resistant 27 V lithium batteries, one battery operation time is 400-500 hours *(MWD has main and backup batteries).
Telemetry type
Mud pulse, positive pulses
Mud pulse, positive pulses
Programming
Module programming on the surface with the possibility of changing operation modes at the bottom.
Module programming on the surface with the possibility of changing operation modes at the bottom.
Fully retrievable
57 mm - minimum passing diameter
57 mm - minimum passing diameter
Maximum operating temperature
175 ˚C (347 ˚F)
175 ˚C (347 ˚F)
Maximum mud pressure
137,9 MPa (20 000 Psi)
137,9 MPa (20 000 Psi)
Recommended mud flow rate
0.30 – 0.63 m³/min (5 – 10.5 L/s), Ø3 ½” (88.9 mm) 0.38 – 1.14 m³/min (6.3 – 19 L/s), Ø4 ¾” (120.6 mm) 0.57 – 2.27 m³/min (9.5 – 37.8 L/s), Ø6 ½” (165.1 mm) 1.5 – 4.45 m³/min (25 – 74.2 L/s), Ø8 ¼” (214 mm)
0.30 – 0.63 m³/min (5 – 10.5 L/s), Ø3 ½” (88.9 mm) 0.38 – 1.14 m³/min (6.3 – 19 L/s), Ø4 ¾” (120.6 mm) 0.57 – 2.27 m³/min (9.5 – 37.8 L/s), Ø6 ½” (165.1 mm) 1.5 – 4.45 m³/min (25 – 74.2 L/s), Ø8 ¼” (214 mm)
Differential pressure of fluid with density of 1,000 kg/m3
0.689 MPa at 25.5 L/s (100 psi at 1.52 m³/min)
0.689 MPa at 25.5 L/s (100 psi at 1.52 m³/min)
Maximum content of LCM material (medium size if mixed well)
154,6 - 193,3 kg/m³ (40 – 50 ppb)
114 kg/m³ (40 ppb)
Maximum mud sand content
1 %
1 %
Accuracy:
Inclination, deg.
±0,1˚
±0,1˚
Azimuth, deg.
±0,25˚
±0,25˚
Tool Face, deg.
±0,5˚
±0,5˚
Natural gamma radiation level (AI GR)
±7 %
±7 %
Temperature, C˚
±2,5˚C
±0,5˚C
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