RU2563413C1 - Method of sealing downhole motor input electric line module split joint - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: claimed method allows a sealed split joint at downhole motor electric line input module. Pump input module consists of the housing that features no shifts of its axis from casing elements and flanges for connection with pump and drive motor. Module housing is provided with channels for shaft, fluid flows and separate channel for tight two-way coupling of the motor electrical connection, holes filled with electric-insulation fluid and intended for sealing of electric line. Joint tightness is ensured by seal rings and plugs with circular seals or lead and copper washers, or there can be made an open cavity fir sealing the jot by compound. Connection of electric line is executed with the help coupling by mating sealed couplings.

EFFECT: expanded applications, reliable design of right joint, higher safety.

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Description

The invention relates to the field of hydrocarbon production and is intended for pumping liquid by wells with submersible electric centrifugal and electric screw pumps of various types with a submersible motor in a sealed enclosure and other arrangements.

Known input module (analogue) of a submersible centrifugal multistage pump [1] (RF Patent No. 2237198 CE published: 09/27/2004). The input module of the pump contains a shaft configured to absorb axial load from the shaft of the lower module section of the pump and without the possibility of transmitting axial load to the tread shaft of a submersible motor. An additional cavity (DP) located in the lower part of the input module is formed in the housing of the input module. In the DP is the axial shaft support. At the same time, at least one hole is made in the side wall of the DP for connecting the DP with the annulus.

The disadvantage of this invention is the inability to use with a submersible motor in a sealed enclosure with a sealed detachable connection of the electrical line of a submersible motor.

A known input module (analogue) for a submersible electric centrifugal pump [2] (RF Patent No. 81273 U1, published: 03/10/2009) containing a perforated housing, a head, a base, a shaft mounted in the housing with the possibility of rotation, a filter element, characterized in that the filter element is made in the form of a compression spring and is located between the housing and the shaft with the possibility of adjusting the inter-turn clearance, the lower supporting end of the spring is placed in the groove of the base, and the upper end of the spring is connected to the spring movement mechanism, while the spring movement is made in the form of a pusher placed in the head with the possibility of axial movement, and a mounting element, one end of which is rigidly connected to the pusher, and the other end of the mounting element is placed in the hole of the head with the possibility of moving it along the axis of the input module and fixing in different positions .

The disadvantage of this module is the inability to use with a submersible motor in a sealed enclosure with a sealed detachable connection of the electrical line of the submersible motor.

A known input module of a submersible electric pump (prototype) [3] (RF Patent No. 80518 U1, published: 02/10/2009), consisting of a housing with a central channel, upper for connecting to the pump and lower for connecting to the motor flange connections, as well as with channels communicating the inner space of the casing with the outer one, characterized in that the casing is prefabricated, consisting of upper parts with an upper flange connection and lower parts with a lower flange connection, interconnected by a threaded connection, moreover, In the case of internal threads, a cylindrical expansion was made with an axis displaced relative to the axis of the casing and an external technological thread on the electric motor side, while the external holes of the channels are located below the technological thread, through the channels made through the cable laid in them with the possibility of sealing, and the inputs and outputs of the through channels are located outside the housing part with the expansion, above and below the technological thread p Expansion.

The disadvantages of this module are the need for exemption from armor, butchering and subsequent splicing of the supply cable, the unreliability of its sealing, mechanical damage to the cut cable during transportation, installation and lowering into the well. In addition, the installation of a submersible electric motor and hydraulic protection in a casing require special conditions - a closed room with a shaft and a lifting mechanism to a height of at least 12 m. Installation at the well is difficult and time-consuming.

An object of the invention is to expand the scope of application of the input module in installations with submersible electric centrifugal and electric screw pumps of various types with a submersible motor in an airtight casing and other layouts, creating a reliable design for a sealed connection of an electric line, increasing its security, eliminating the need for cable cutting and making connections with subsequent joint insulation; installation at the wellhead in any weather conditions.

The technical result achieved by the invention is solved by a method of sealed detachable connection in the input module of the electric line of a submersible electric motor.

The input module of the pump consists of a housing made without displacement of the axis relative to the elements of the casing, with flanges for connecting to the pump and the submersible motor, the housing of the input module is equipped with a through channel for the shaft of the pumping unit, channels for the passage of fluid.

According to the invention, a separate channel is made in the housing of the input module for accommodating a sealed double-sided coupling of the electrical connection of the submersible motor, an opening for filling with an insulating liquid and for crimping the connection of the electrical line. The tightness of the connection is provided by ring sealing elements and plugs with ring sealing elements or lead and copper gaskets, and an open cavity can also be made for sealing the channel with a compound. The electrical line connection is made using a sealed two-way coupler mating tight couplings. The drawing shows the design of the input module, explaining the method of sealed detachable connection in the input module of the electric line of the submersible motor.

The input module consists of a housing 1 with a guide key 2, sealing elements 3, flange connections 4, a through channel for the shaft 5, channels for the passage of fluid 6, a split nut 7, a separate channel 10 for accommodating sealed two-way couplings 8, cable connecting sections 11 for connecting sealed double-sided couplings 8 with sealing elements 13, holes for crimping 9, which are closed with plugs 12.

The housing 1 of the input module is made without axis displacement, with flanges 4 for connecting to the pump and a submersible motor, a through channel 5 for the shaft of the pump installation, channels 6 for the passage of fluid.

According to the invention, a separate channel 10 is made in the housing 1 of the input module for accommodating an airtight double-sided coupling 8 for electric connection of a submersible electric motor, with sealing elements 13, openings 9 for filling with insulating liquid and for crimping the electrical line connections that are closed by plugs 12, tightness of the connection is provided by ring sealing elements 13 and plugs 12 with ring sealing elements or lead and copper gaskets, and may also An open cavity was made to seal the channel with a compound. Cable sleeves 8 are connected by cable lengths 11. The input module is connected to the hermetic casing by means of a split nut with a thread 7 located in the recess of the input module casing 1, the key guide 2 and the sealing ring elements 3 to seal the connection with the hermetic casing of the submersible motor. The connection of the electric line is made using a sealed double-sided coupler 8 mating hermetic couplings.

Technological and technical results when using the method are achieved by accelerating the installation of ESPs or other equipment and increasing the security of the cable and electrical plug connection from mechanical damage. The economic effect of the use of the invention can be achieved by increasing the time between failures, extending the life of the pump unit and accelerating its installation.

References

1. RF patent RF №2237198 C1, published: 09/27/2004.

2. RF patent No. 81273 U1, published: 03/10/2009.

3. RF patent No. 80518 U1, published: 02/10/2009.

Claims (1)

A method of sealed detachable connection in the input module of the electric line of a submersible electric motor, in which the input module of the pump consists of a housing made without an axis offset relative to the housing elements, with flanges for connecting to the pump and the electric motor, the input module housing is provided with a through channel for the shaft of the pump installation, channels for the passage of fluid, characterized in that a separate channel is made in the housing of the input module to accommodate a sealed two-way coupler The electrical connection of the submersible motor, the holes for filling with an insulating fluid and for crimping the electrical line connection, the tightness of the connection is provided by ring sealing elements and plugs with ring sealing elements or lead and copper gaskets, and an open cavity can be made to seal the channel with a compound, and the connection electrical line is made using a sealed two-way coupler mating tight couplings.