Fluid handling – Systems – Programmer or timer
Patent
1981-03-05
1983-08-30
Cohan, Alan
Fluid handling
Systems
Programmer or timer
251 29, 251 30, 251 57, F16K 31124
Patent
active
044011342
ABSTRACT:
A mud pulser for mud flow in a conduit. A fluid reservoir operates when positioned in the flow of mud for imparting energy from the mud to separate fluid in the reservoir. A hydraulically operated valve is inserted in the flow of mud displaced from the fluid reservoir and includes an actuation chamber for the separate fluid. A fluid operated control valve is coupled between the fluid reservoir and the actuation chamber. An electrically controllable valve is coupled between the fluid reservoir and a control port for the control valve. The electrically controllable valve is operative in response to a first electrical signal applied thereto for providing communication in the separate fluid between the fluid reservoir and the control port to thereby allow an energy transfer in the fluid between the mud flow and the control port. The electrically controllable valve is also operative in response to a second electrical signal for blocking fluid communication between the fluid reservoir and the control port. The control valve is responsive to the energy transferred in the separate fluid to the control port for assuming a first condition wherein fluid communication between the fluid reservoir and the actuation chamber is blocked, and a second condition wherein fluid communication is provided through the control valve such that energy is transferred in the separate fluid from the mud flow to the actuation chamber. The hydraulically operated valve is responsive to the energy applied to the actuation chamber for creating a change in the restriction of the mud flow to thereby initiate a pressure pulse in the mud flow.
REFERENCES:
patent: 2728547 (1955-12-01), Crookston
patent: 2759143 (1956-08-01), Arps
patent: 2898088 (1959-08-01), Alder
patent: 3754566 (1973-08-01), Gemigniani
patent: 3981478 (1976-09-01), Lundsgart
Cohan Alan
Smith International Inc.
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