Pumping water from a natural gas well

Details Pumping water from a natural gas well Pumping water from a natural gas well

F - Mech Eng,Light,Heat,Weapons

04

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F04B 47/00 (2006.01) E21B 43/12 (2006.01) F04B 47/14 (2006.01)

Patent

CA 2531202

In de-watering a gas well the water is pumped by an inverted API pump acting as a reciprocating pump from a position in the casing below the formation and the gas escapes through the casing around the transport tubes. The pump is driven by a downhole engine in the form of a cylinder and piston which is moved by a hydraulic pump at the surface to generate a hydraulic flow to drive the piston and causing fluid to be transferred from the cylinder on the other side of the piston to a counterbalance chamber against a back pressure provided by a charge of nitrogen gas. At the end of a pumping stroke, pressure in the hydraulic fluid from the hydraulic pump is released to cause the back pressure of the counterbalance chamber to drive the piston back to the start position.

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