Fluid actuated jack mechanism

Details Fluid actuated jack mechanism Fluid actuated jack mechanism

B - Operations, Transporting

66

F

254/148, 255/14.

B66F 3/24 (2006.01) E21B 19/08 (2006.01) E21B 19/086 (2006.01)

Patent

CA 1187476

Abstract of the Disclosure A well pipe jacking mechanism in which a reversible variable displacement pump acts in one condition to deliver pressure fluid in parallel with another pump to the lower end of a jacking cylinder, while receiving and metering fluid from the upper end of the cylinder to regulate upward piston move- ment. In a second condition, flow through the variable dis- placement pump is reversed to lower the piston, and a variable restriction valve regulates discharge of fluid from the lower end of the cylinder. In a third condition, the variable dis- placement pump discharges fluid to the lower end of the cylin- der and exerts an upward force of increased power on the pis- ton.

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