IP Library › Patent Application 12451448
Patent Application
App. No. 12/451,448

Hydraulic Pump-Drive Downhole Fluids Pump With Linear Driver

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Quick Facts
Patent No.
US None
App. No.
12/451,448
Abstract

A downhole pump assembly for removing volumes of liquids, crude oils, gases, and produced waters, from oil or gas wells is described based on a downhole controllable electric drive, and a positive displacement pump, wherein the electric drive powers a hydraulic pump that powers the positive displacement pump.

Claims (19)

1 . A downhole pump assembly for removing volumes of liquids, crude oils, gases and produced waters from oil or gas wells to earth surface comprising:

a. a downhole controllable electric linear drive;

b. a hydraulic pump; and

c. a positive displacement type pump;

d. wherein said controllable electric linear drive drives said hydraulic pump and wherein said hydraulic pump drives said positive displacement pump.

2 . The downhole pump assembly of claim 1 further comprising an energy storage device, said energy storage device being compressed by an upward movement of said controllable electric linear drive; and said energy storage device being in mechanical communication with said hydraulic pump to then transmit downward motion to said hydraulic pump.

3 . The downhole pump assembly of claim 2 wherein said energy storage device is selected from the group consisting of a drive spring, and a gas chamber.

4 . The downhole pump assembly of claim 1 wherein said positive displacement pump is selected from the group consisting of a piston type, a plunger type, and a diaphragm/bladder type.

5 . The downhole pump assembly of claim 1 wherein said controllable electric linear drive is selected from the group consisting of a permanent magnet synchronous machine (PMSM) type, and a synchronous reluctance machine (SRM) type.

6 . The downhole pump assembly of claim 1 further comprising a combination of continuous coil tubing or strength cable and electric wiring connected to a top section of said downhole pump assembly; said combination providing electronic communication for operation and capability for retrieval of pump assembly back to earth surface.

7 . The downhole pump assembly of claim 1 further comprising electrically actuated techniques for equalizing pressures across seals and valves to enable retrieval of said downhole pump assembly.

8 . A method of removing volumes of liquids, crude oils, gases and produced waters from oil or gas wells to earth's surface comprising the steps of:

a. driving a downhole hydraulic pump by a controllable electric linear drive;

b. using said downhole hydraulic pump to drive a positive displacement pump to remove said volumes of liquids, crude oils, gases and produced waters from oil or gas wells to earth's surface.

9 . The method of removing volumes of liquids, crude oils, gases and produced waters from oil or gas wells to earth's surface of claim 8 further comprising the steps of:

a. compressing an energy storage device with said controllable electric linear drive; and

b. transmitting motion to said downhole hydraulic pump with said energy storage device.

wherein said energy storage device can be a drive spring or a gas chamber.

10 . The method of removing volumes of liquids, crude oils, gases and produced waters from oil or gas wells to earth's surface of claim 8 further comprising the steps of equalizing pressures across seals and valves to enable retrieval of said downhole pump assembly.