Analysis of vibration and pressure pulsation in positive displacement drilling motors
Three, Moineau principle, positive displacement (drilling) motors were tested on a dynamometer using water, air/mist, and foam. In conjunction with a traditional motor performance test, data were collected at 5000 samples per second using an adapted seismic data acquisition system. Shaft speed, torque, pressure, and three-axis vibration data were processed using Seismic Analysis Code (SAC) to obtain energy density spectrums (EDSs). Cascade plots were generated by plotting the EDSs against shaft speed. The cascade plots revealed that pressure pulses and motor vibrations are closely related to the eccentric rotation of the rotor in the power section. Excessive no-load vibrations were not observed in the small motors and test apparatus used; increasing torque usually decreases the amplitude of vibrations observed. Motor vibration amplitudes were as a rule not increased when compressible fluids were substituted for water.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Management and Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 350836
- Report Number(s):
- LA-UR-98-4024; CONF-990217-; ON: DE99002575; TRN: AHC29921%%19
- Resource Relation:
- Conference: ETCE `99: American Society of Mechanical Engineers (ASME) energy sources technology conference, Houston, TX (United States), 1-3 Feb 1999; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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