A cooling device for a downhole submersible motor

Abstract

The invention belongs to the technical field of oilfield production, and discloses a cooling device for a downhole submersible motor, which comprises a water injection pump, a pump suction port, a cooling pump, a sealing joint, a protector and a motor connected in turn from top to bottom. At that same time, the motor drive the water injection pump and the cool pump, the water injection pump and the cooling pump share a pump suction port, the water injection pump discharge direction is upward, and the cooling pump discharge direction is downward; The sealing joint is connected with the coolingpump and the protector; A flow guide tube is symmetrically connected on both sides of the sealing joint, the upper end of the flow guide tube is communicated with the inner annulus of the sealing joint, and the lower end of the flow guide tube extends to the lower part of the motor. A low-temperature liquid in an annulus is extract by a cooling pump and pressurized, A liquid flow is for on that surface of the motor through the sealing joint and the flow guide pipe, thereby continuously radiate heat for the motor, avoiding insulation damage caused by excessive temperature of the motor, enablingthe motor to be normally use in the annulus with the sealed bottom, and prolonging the service life of the product.

Description

technical field [0001] The invention belongs to the technical field of oil field production, and in particular relates to a cooling device for an underground submersible motor. Background technique [0002] In the process of oil field production, during the layered injection process, the conventional electric submersible pump runs in the water injection casing, while the electric submersible pump has a packer set under the motor, and the annulus between the motor and the casing is sealed , at this time, because the injection water at the motor position is far away from the suction port, the water injection pump cannot absorb the injection water near the motor position through the suction port, so the injection water around the motor hardly flows, so that the surface of the motor cannot be cooled , causing the temperature of the motor to continue to rise, and the winding insulation will be damaged after the temperature is higher than the temperature resistance level. [0003...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem that the current electric submersible pump water injection string cannot effectively cool the surface of the motor, and provides a cooling device for the downhole submersible motor, which forms a continuous liquid flow on the surface of the motor through low-temperature liquid, It plays the role of heat dissipation for the motor, avoiding the insulation damage of the motor due to excessive temperature, so that the motor can be used normally in the annular space where the bottom is sealed, and the service life of the product is improved

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