Development of a Near-Bit MWD system
The project objective is to develop a measurements-while-drilling (MWD) module that provides real-time reports of drilling conditions at the bit. The module is to support multiple types of sensors and to sample and encode their outputs in digital form under microprocessor control. The assembled message is to be electromagnetically transmitted along the drill string back to its associated receiver located in a collar typically 50--100 feet above the bit. The receiver demodulates the transmitted message and passes it data to the third party wireline or MWD telemetry system for relay to the surface. The collar also houses the conventional MWD or wireline probe assembly. The completed Phase 1 program began with the preparation of detailed performance specifications and ended with the design, fabrication and testing of a functioning prototype. The prototype was sized for operation with 6-3/4-inch multi-lobe mud motors due to the widespread use of this size motor in horizontal and directional drilling applications. The Phase 1 prototype provided inclination, temperature and pressure information. The Phase 2 program objective is to expand the current sensor suite to include at least one type of formation evaluation measurement, such as formation resistivity or natural gamma ray. The Near-Bit system will be subjected to a vigorous series of shock and vibration tests followed by field testing to ensure it possesses the reliability and performance required for commercial success.
- Research Organization:
- Maurer Engineering, Inc., Houston, TX (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-93MC29252
- OSTI ID:
- 67782
- Report Number(s):
- DOE/MC--29252-95/C0460; CONF-950494--13; ON: DE95012312
- Country of Publication:
- United States
- Language:
- English
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Development of a near-bit MWD system. Phase 2 -- Final report
Development of a near bit MWD system. Quarterly report, October--December 1993