SEMWD-2000

System Description of SEMWD-2000

The system is made up of downhole tools and surface equipment. The downhole tools connected in the drilling-string can measure directional parameters and GR parameters, then send them to the surface. The waves are caught by the Surface Receiver. After amplification, de-noising and digital data acquisition, the data can be recovered, displayed and recorded by the computer, the directional parameters are displayed on the driller's monitor.

Application Area of SEMWD-2000

MWD of gas drilling and mixed medium drilling wells.
Vertical drilling control.
MWD of shallow formations and coal seam gas wells.
Horizontal wells and directional wells that suitable for electromagnetic wave transferring.

Parameters Measured:
Well deviation, azimuth, tool face, temperature, GR, resistivity, annular pressure, etc.

Technical Specifications of SEMWD-2000

Measure range and accuracy:

Deviation: 0～180° ±0.2°	OD: 48mm
Azimuth: 0～360° ±1.5°	Drill Collar OD: 4.75”, 6.5”, 7”
Tool face: 0～360° ±1.5°	Carrier wave: 2Hz～12.5Hz
GR: 0～500API ±7%	Baud rate: 0.5～6.25 bit/s
Temperature: -25～125℃	Formation resistivity: 2～1000Ω·m
Pressure: 105MPa	Continues working time: 200h

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