Submersible pump unit drive heat exchanger having a diaphragm compensator

Abstract

A drive of a submersible pump having a housing, an oil-filled electric motor, a heat exchanger and a compensator hydraulically connected by an oil channel to the oil-filled cavity of the electric motor. The drive has channels to circulate oil in the drive for heat exchange between the oil and the well fluid. Inside the heat exchanger, there is a through channel of the heat exchanger for the well fluid flow. The compensator has a diaphragm placed in a cylindrical casing adjoining an outer side surface of the diaphragm to an inner side surface of the cylindrical casing. The through channel of the heat exchanger for the well fluid flow has an annular cross-section with an inner wall formed by the outer side surface of the cylindrical casing and with an outer wall formed by an inner surface of the cylindrical sleeve of the heat exchanger.

1 . A submersible pump unit drive with heat exchanger, comprising:
 a housing;   an oil-filled electric motor contained in the housing;   a heat exchanger connected to the electric motor and located below the electric motor;   a compensator installed in the heat exchanger;   an oil channel hydraulically connected with an oil-filled cavity in the electric motor, wherein the oil channel provides oil circulation in the electric motor for heat exchange between oil and well fluid;   a through channel inside of the heat exchanger for flow of well fluid through the heat exchanger, wherein the through channel has an inlet for flow of well fluid from an annulus and an outlet for the flow of well fluid into the annulus, wherein the inlet and the outlet are made in an lower and upper parts of the heat exchanger respectively.   
     
     
         2 . The submersible pump unit drive with heat exchanger of  claim 1 , further comprising:
 a diaphragm made of elastomeric material, which is placed in a cylindrical casing adjoining an outer side surface of the diaphragm to a corresponding inside surface of an outside surface of the cylindrical casing.   
     
     
         3 . The submersible pump unit drive with heat exchanger of  claim 2 , further comprising:
 a cylindrical sleeve surrounding the cylindrical casing of the heat exchanger wherein the through channel of the heat exchanger for the flow of the well fluid is a channel of an annular cross section with an inner wall formed by an outer surface of the cylindrical casing and with an outer wall formed by an inner surface of the cylindrical sleeve of the heat exchanger, while the heat exchanger contains a circulation channel for oil from the electric motor for heat exchange between oil and well fluid, formed between the outer surface of the heat exchanger sleeve and the inner surface of the heat exchanger housing.   
     
     
         4 . The submersible pump unit drive of  claim 3 , wherein the diaphragm further comprises a two-bag diaphragm, and wherein the heat exchanger has lower and upper flanges, in which the inlet and outlet of the through channel of the heat exchanger are made, respectively, for the flow of well fluid, wherein the two-bag diaphragm is placed in a cylindrical casing between a first flange and a second flange. 
     
     
         5 . A submersible pump unit drive with a heat exchanger, comprising:
 a housing;   an oil-filled electric motor contained in the housing;   a heat exchanger connected to the electric motor and located below the electric motor;   a compensator installed in the heat exchanger;   an oil channel hydraulically connected with an oil-filled cavity in the electric motor, wherein the oil channel provides oil circulation in the electric motor for heat exchange between the oil in oil-filled cavity in the electric motor and well fluid; and   a through channel inside of the heat exchanger for a flow of the well fluid through the heat exchanger, wherein the through channel has an inlet for flow of well fluid from an annulus and an outlet for the flow of well fluid into the annulus, wherein the inlet and the outlet are made in a lower and upper part of the heat exchanger respectively.   
     
     
         6 . The submersible pump unit drive of  claim 5 , further comprising:
 a two-bag diaphragm made of elastomeric material, which is placed in a cylindrical casing adjoining an outer side surface of the diaphragm to a corresponding inside surface of an outside surface of the cylindrical casing.   
     
     
         7 . The submersible pump unit drive of  claim 6 , further comprising:
 a cylindrical sleeve surrounding the cylindrical casing of the heat exchanger wherein the through channel of the heat exchanger for the flow of the well fluid is a channel of an annular cross section with an inner wall formed by an outer surface of the cylindrical casing and with an outer wall formed by an inner surface of the cylindrical sleeve of the heat exchanger, while the heat exchanger contains a circulation channel for oil from the electric motor for heat exchange between oil and well fluid, formed between an outer surface of the heat exchanger cylindrical sleeve and the inner surface of the heat exchanger housing.   
     
     
         8 . A method for cooling a submersible pump unit drive, the method comprising:
 circulating oil in an oil-filled electric motor contained in a submersible pump unit drive through an oil channel hydraulically connected with an oil-filled cavity in the electric motor, wherein the oil channel provides oil circulation in the electric motor between the electric motor and a heat exchanger for heat exchange between the oil and a well fluid.   
     
     
         9 . The method of  claim 8 , the method further comprising:
 flowing well fluid through channel inside of the heat exchanger for flow of well fluid through the heat exchanger, wherein the through channel has an inlet for flow of well fluid from an annulus and an outlet for the flow of well fluid into the annulus, wherein the inlet and the outlet are made in a lower and upper part of the heat exchanger respectively.   
     
     
         10 . The method of  claim 9 , wherein a first diaphragm made of elastomeric material, which is placed in a cylindrical casing adjoining an outer side surface of the diaphragm to a corresponding inside surface of an outside surface of the cylindrical casing. 
     
     
         11 . The method of  claim 10 , wherein a cylindrical sleeve surrounding the cylindrical casing of the heat exchanger wherein the through channel of the heat exchanger for a flow of the well fluid is a channel of an annular cross section with an inner wall formed by an outer surface of the cylindrical casing and with an outer wall formed by an inner surface of the cylindrical sleeve of the heat exchanger, while the heat exchanger contains a circulation channel for oil from the electric motor for heat exchange between oil and well fluid, formed between the outer surface of the heat exchanger sleeve and the inner surface of a heat exchanger housing. 
     
     
         12 . The method of  claim 11  wherein a second diaphragm made of elastomeric material, is placed in a cylindrical casing adjoining an outer side surface of the diaphragm to a corresponding inside surface of an outside surface of a cylindrical casing.