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Project Number 13
Date of Summary September 30, 1985
Subject Fluidic Pulser for Mud Pulse Telemetry
Performing Activity Harry Diamond Laboratories
Principal Investigator Mr. Allen Holmes
Contracting Agency Minerals Management Service
Estimated Completion Complete
Description Develop technology for using fluidic controlled flow for mud pulse telemetry. Mud pulse telemetry is a system of obtaining downhole digitized data while drilling by pulsing through the drill mud.
Progress Complete. The characteristics of drilling mud as well as the geometry downhole and the needed rates of mud circulation were adequate for fluidic control hardware. Several designs of fluidic control valves were tested using both water and drilling muds. A final experimental model, which has four vortex stages, was developed for use in a 4+ inch drill pipe.

After preliminary tests in a short flow loop, the pulsar was transferred to Louisiana State University Well Control Research Facility for further evaluation. Tests in a 10,000 foot flow loop, using water and three 8.9 ppg water-base muds have produced clear transmissions at frequencies up to 13 Hz. The limiting frequency is a function of the pulsar solenoid, not the fluidic design.

Testing on heavier muds and oil-based muds will continue at Louisiana State University. Calculations are being made on transmission rates required for reliable and sufficient mud pulse telemetry data suitable for emergency well control operations. The project was transferred to Louisiana State University, Project No. 8.
Reports
AA (827 KB) File in Adobe's Portable Document Format (PDF) . Holmes, A. B., Gehman, S. E., Fluidic Approach to the Design of a Mud Pulser for Bore Hole Telemetry Applications During Drilling, Harry Diamond Laboratories, HDL-TM-79-21, Harry Diamond Laboratories, Silver Spring, Maryland, August 1979.
AB (1.243 KB) File in Adobe's Portable Document Format (PDF) . Holmes, A. B., Fluidic Mud Pulse Telemetry Technology Investigations for Measurement While Drilling Applications, Harry Diamond Laboratories, Silver Spring, Maryland, November 1980 (Unpublished report).
AC (776 KB) File in Adobe's Portable Document Format (PDF) . Holmes, A. B., The Fluidic Approach to Mud Pulser Design for Measurement While Drilling Systems, Harry Diamond Laboratories, Silver Spring, Maryland, September 1982 (Unpublished report).
AD (1.555 KB) File in Adobe's Portable Document Format (PDF) . Holmes, A. B., The Fluidic Approach to Mud Pulser Value Design for Measurement While Drilling Applications, Report No. HDL-TR-2058, Harry Diamond Laboratories, Silver Spring, Maryland, November 1985.
 

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