MWD principle introduction , cable transmission method advantages:
The information transmission has high efficiency, high speed, large amount of information, and real-time transmission.
No underground power is required, and ground power is conducted downhole through cables;
Can be two-way communication, forming a closed-loop control;
There is no information attenuation problem and there is no well depth limitation;
1. Cable drill pipe:
Special drill pipe, buried in the drill pipe wall. Special joints not only connect drill pipes but also connect cables.
Disadvantages: cable drill pipe production is too complicated;
2. Cable while drilling:
Instruments and cables enter the drill rod water eye from the test fittings and run downhole. Disadvantages:
Can't take a single order after entering.
Unable to perform rotary drilling;
Cables are prone to wear; etc.
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