Development of turbodrill tachometer. Final report [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1981.
- Physical Description:
- Pages: 59 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- The objective of the study was to develop a tachometer for use with the METC turbodrills. Tachometers are needed to allow efficient operation of the turbodrills. The operating speed of the turbodrills is now unknown, resulting occasionally in excessive operating speeds and rapid bit wear. In some applications, good tachometers could increase the footage drilled per bit run and greatly reduce drilling costs. This project resulted in the successful testing of a prototype turbodrill tachometer. The tachometer utilizes a set of partially blanked turbine blades in the motor section of the turbodrill which produce one pressure pulse each time the turbodrill rotates one revolution. The pressure pulses are transmitted through the drilling mud in the drill pipe to the surface where they are detected and processed. The frequency of the pulse signals is a direct measure of the turbodrill rotary speed. Numerous laboratory tests of the pulse tachometer were conducted at Maurer Engineering's turbodrill facility in Houston, Texas. Motor test stand comparisons of the mud pulse tachometer with direct magnetic and optical tachometers usually demonstrated excellent agreement. The tachometer performed well at depths in excess of 10,000 feet in Los Alamos Scientific Laboratories' EE-2 geothermal well. Water was used as the drilling fluid in these tests. The tachometer allowed continual monitoring and control of the LASL turbodrill speed. This attributed, in large part, to the success of the LASL turbodrills. Over 20 successful turbodrill boreholes were made using the tachometer. Although attenuatin is greater in viscous drilling mud than in water, theory indicates that the pulse tachometer should be effective with viscous muds even at depths of 10,000 to 20,000 feet.
- Published through SciTech Connect.
McDonald, W.J.; Maurer, W.C.; Dareing, D.W.
Maurer Engineering, Inc., Houston, TX (USA)
- Funding Information:
View MARC record | catkey: 14118336