Downhole hydraulic control system

Details Downhole hydraulic control system Downhole hydraulic control system

E - Fixed Constructions

21

B

E21B 23/04 (2006.01) E21B 17/10 (2006.01) E21B 17/16 (2006.01)

Patent

CA 2657012

A purely mechanical hydraulic control system includes at least one drilling fluid chamber and a hydraulic fluid chamber. A system pressure spring is deployed in one of the drilling fluid chamber(s) between a positioning piston and a system pressure piston. The spring is disposed to pressurize oil in the hydraulic fluid chamber via applying a spring force to the system pressure piston. When the system is actuated (e.g., via turning on the mud pumps), the positioning piston is urged in place against a stop (e.g., a shoulder) thereby compressing the system pressure spring and pressurizing oil in the hydraulic chamber. The invention advantageously converts highly variable drilling fluid pressure to a near constant pressure hydraulic fluid.

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