Artificial lift method for low pressure sagd wells
a technology of artificial lift and well, which is applied in the direction of fluid removal, earthwork drilling and mining, and well accessories, etc., can solve the problems of electrical insulation materials often failing, electric motor complete failure, and insufficient conductors and insulators of electric motors for certain high-temperature downhole applications
Inactive Publication Date: 2014-06-26
GE OIL & GAS ESP
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Benefits of technology
The pumping system described in this patent uses a hydraulic motor to drive a production pump. This motor is powered by an electric motor that can be controlled by a surface operator. The pressurized fluid produced by the motor drives a hydraulic turbine located in the wellbore, which in turn powers the production pump. The pressurized fluids produced by the pump are then carried to the surface. The technical effect of this invention is a more efficient and effective pumping system for producing fluids from oil and gas wells.
Problems solved by technology
Although widely accepted, the conductors and insulators within the electric motors may be inadequate for certain high-temperature downhole applications.
Electrical insulation materials often fail under these elevated temperatures or under prolonged exposure to wellbore fluids and contaminants.
If an electrical insulator is compromised by these conditions, an electrical short may occur that causes the complete failure of the electric motor.
Method used
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[0008]In accordance with a preferred embodiment of the present invention, FIG. 1 shows an elevational view of a pumping system 100. The pumping system 100 generally includes a hydraulic motor assembly 102, a production pump 104 and production tubing 106. The pumping system 100 is generally configured to pump fluids through the production tubing 106 from a subterranean wellbore 108 to a wellhead 110 located on the surface. The wellbore 108 is drilled for the production of a fluid such as water or petroleum. As used herein, the term “petroleum” refers broadly to all mineral hydrocarbons, such as crude oil, gas and combinations of oil and gas.
[0009]Unlike convention submersible pumping systems, the pumping system 100 does not include an electric motor within the wellbore 108. In place of the conventional electrical motor, the production pump 104 is driven by the hydraulic motor assembly 102. The hydraulic motor assembly 102 includes a master pump 112, an electric motor 114 and a hydrau...
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A pumping system includes a hydraulic motor assembly configured to drive a production pump. The hydraulic motor assembly includes a master pump located on the surface and an electric motor configured to controllably power the master pump. When moved by the electric motor, the master pump discharges a working fluid under pressure. The pressurized working fluid is transferred to a hydraulic turbine located in the wellbore. The hydraulic turbine converts the pressure of the working fluid into torque, which is transferred through a driveline to a production pump. The production pump pressurizes production fluids, which are carried under pressure to the surface.
Description
FIELD OF THE INVENTION[0001]This invention relates generally to the field of submersible pumping systems, and more particularly, but not by way of limitation, to a hydraulically-driven submersible pumping system configured for use in high-temperatures applications.BACKGROUND[0002]Submersible pumping systems are often deployed into wells to recover petroleum fluids from subterranean reservoirs. Historically, submersible pumping systems have included one or more fluid filled electric motors coupled to one or more high performance pumps located above the motor. When energized, the electric motor provides torque to the pump, which pushes wellbore fluids to the surface through production tubing. Each of the components in a submersible pumping system must be engineered to withstand the inhospitable downhole environment.[0003]Although widely accepted, the conductors and insulators within the electric motors may be inadequate for certain high-temperature downhole applications. In particular...
Claims
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IPC IPC(8): E21B43/12
CPCE21B43/129
Inventor SAKAMOTO, STEPHEN
Owner GE OIL & GAS ESP