RU2520556C2 - Pump unit bypass system - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil-submersible equipment and may be used for well fluid lifting and well parameters measurement without removal of the pump unit. The pump unit bypass system contains a Y-unit with a plug, and a string of bypass pipes is suspended to one output of the Y-unit by means of a cut-off clutch, connector and nozzles. The pump unit with a submersible pump and submersible motor equipped with a support tube is connected to the second output of the Y-unit through a cut-off clutch and a counterbalance valve. At that the string of bypass pipes and the pump unit are interconnected by protectolisers and a saddle. The connector is of disconnectable type; it consists of two symmetric parts with longitudinal hemicylindrical and prismatic caves. The connector parts are hinged at free ands from the side of the prismatic cave and screws between the caves for the purpose of additional fixture of the bypass pipe string and the pump unit due to cover of the prismatic caves by the walls of the pump unit. The bypass pipe is perforated at the level of the submersible motor.

EFFECT: simplification of assembly process of the pump unit bypass system, increase in thermal stability of the submersible motor and operational reliability of the whole pump unit.

2 dwg

Description

The invention relates to oil immersion equipment and can be used to raise well fluid and measure well parameters without removing the pumping unit.

A well-known bypass system of a pump installation, consisting of a Y-block with a plug, is connected to a single output through a swivel column of bypass pipes with a funnel at the end, and sections of a submersible pump with hydraulic protection and an electric motor are suspended to the second output using an adapter and a valve, and equipped with protectors and holder (Badretdinov Yu.A., Valiullin A.S., Parkhimovich A.Yu. Bypass systems for ESPs of INTECO company. The first experience of conducting GIS in EC with a diameter of 146 mm // Engineering Practice. 2011. No. 8, p.120 -122).

The disadvantage of this bypass system is the unsatisfactory adaptability during installation, as well as the difficulty of lifting the pumping unit when jamming in the well.

The closest in technical essence to the claimed is the bypass system of the pumping unit, consisting of a Y-block with a plug, a column of bypass pipes is attached to one output of it by a burst sleeve, connector and nozzles, and a pump line is connected to the second output through a burst sleeve and balancing valve installation, containing a submersible pump with a submersible electric motor, while the bypass pipe string and the pumping unit are fastened together by protectors and a saddle with the possibility of their joining, and a swivel was used as a connector (RF Patent No. 2449117, E21B 47/00, 2010).

The disadvantage of the bypass system of the pumping unit adopted as a prototype is the use of a burst clutch with a swivel bypass pipe connector, for rotation of which relative to the longitudinal axis of the pipe requires a special tool, such as a chain wrench. Tool manipulation is difficult due to the proximity to the pipe of the pump unit. In addition, during operation, the bypass pipe with a non-flowing reservoir fluid is a heat accumulator and additionally heats the submersible motor, which can lead to its failure.

The technical problem solved by the present invention is to simplify the assembly technology of the bypass system of the pump installation in the well, increase the thermal stability of the submersible motor and the reliability of the pump installation as a whole.

The specified technical result is achieved by the fact that in the bypass system of the pump installation, consisting of a Y-block with a plug, a column of bypass pipes is suspended to one output of it by means of a burst sleeve, connector and nozzles, and a pump installation is connected to the second output through a burst sleeve and balancing valve containing a submersible pump and a submersible motor equipped with a support pipe, while the bypass pipe string and the pumping unit are fastened together by protectors and a saddle, according but according to the invention, the connector is detachable and consists of two symmetrical parts with a longitudinal semi-cylindrical and prismatic recess, hinged along the free edges from the side of the prismatic recess and screws between the recesses with the possibility of additional fastening of the bypass pipe string with the pumping unit, by covering the latter with the walls of the prismatic recesses and the bypass pipe at the level of the submersible motor is perforated.

The invention is illustrated by drawings, where figure 1 shows a General view of the proposed bypass system of the pumping unit, figure 2 is a cross section of a bypass system passing through the connector.

The bypass system of the pump unit includes a Y-block 1 with the lower outputs 2 and 3 (Fig. 1), in which a plug (not shown) is installed. A column of bypass pipes 8 is attached to the outlet 2 by means of a pipe 6, a bursting sleeve 4 and a detachable connector 5. A pumping unit 10 is connected to the outlet 3 through a pipe 7, a bursting sleeve 4 and a balancing valve 9, comprising a submersible pump 11 and a submersible motor 12 provided with a support a pipe 13, which is rigidly fixed relative to the lower part of the column of bypass pipes 8 using the seat 14. Along the height of the column of bypass pipes 8 and the pumping unit 10 are placed protectorizer 15, fastening them together. The bypass pipe 8 within the submersible motor 12 is made with perforations 16. The detachable connector 5 consists of two symmetrical parts 17 with a longitudinal semicylindrical 18 and a prismatic recess 19 (figure 2). Details 17 on the free edges from the side of the prismatic recesses 19 are connected by a hinge 20 and additionally between the semi-cylindrical and prismatic recesses are fastened with screws 21 oriented perpendicular to the axis of the hinge 20. A pipe 6 and a burst sleeve 4 are placed in the cylindrical cavity formed inside the connector 5, and in its prismatic cavity - pipe 7 of the pumping unit 10, which ensures its fastening with a column of bypass pipes 8.

The installation of the system is carried out by phased assembly and lowering of the bypass pipe string 8 and the pump installation line 10 into the well. First, a saddle 14 with a support pipe 13 and a lower bypass pipe 8 parallel to it is lowered on a clamp-elevator (not shown). After this, they are connected accordingly a submersible motor 12 and a perforated bypass pipe 8, and then the submersible pump 11 and the bypass pipes 8 are docked, while the connections between the parts of the pumping unit 10 and the joints of the individual bypass pipes 8 render They are flush and protected by the protectorolasers 15. Then, a balancing valve 9, a bursting sleeve 4 and a pipe 7 are mounted on the pumping unit line 10, and a bursting sleeve 4 and a pipe 6 are installed on the bypass pipe string 8. On the elevator clamp (not shown), The Y-block 1 and is connected by its outputs 2 and 3 to the nozzles 6 and 7. The detachable connector 5 with the unscrewed screws 21 and the symmetrical parts 17 separated on the hinge 20 is connected to the line of the pumping unit 10 and the bypass pipe string 8. When reducing the symmetrical parts 17 of the wall half cylinder of recesses 18 cover the pipe 6 and the burst sleeve 4, docking them with each other, and the walls of the prismatic recesses 19 - pipe 7. After that, the symmetric parts 17 are pulled together by screws 21 and the column of bypass pipes 8 is connected to the line of the pumping unit 10. Installation is completed by connecting the column Tubing 22 on top of the Y-block 1.

Thanks to the detachable design of connector 5, the assembly of the bypass system of the pumping unit is greatly simplified and the installation time is reduced.

The bypass system of the pump unit operates as follows.

When starting the submersible motor 12, the submersible pump 11 supplies the formation fluid through the balancing valve 9, the burst sleeve 4 and the pipe 7 to the Y-block 1, from where the liquid flows through the tubing string 22 to the surface. When the submersible pump 11 is operating in the valve 9, the channels open, and a plug (not shown) installed in the Y-block 1 prevents the liquid from flowing into the bypass pipe string 8. Perforations 16 prevent heat accumulation in the bypass pipe 8 filled with liquid due to natural convection and reduce the likelihood of thermal stresses in the submersible motor 12.

If it is necessary to measure the parameters of the well or perform other technological operations in it, the submersible motor 12 is turned off and the liquid from the tubing string 22 is discharged into the well through a balancing valve 9.

A blanking plug (not shown) is removed from the Y-block 1 using a tool for tripping, opening a through channel to the bypass pipe string 8. A logging plug (not shown) that remains in the Y-block 1 for prevent the flow of liquid into the column of bypass pipes 8, and a measuring system that passes through the column of bypass pipes 8 and is fixed below the submersible motor 12. Next, when the submersible pump 11 is operating, the well is examined. Upon completion, the submersible pump 11 is turned off, and the geophysical plug with the measuring system is removed to the surface. Before the next start-up of the pumping unit 10, the plug plug is installed in the Y-block 1 with the help of a lifting tool.

Using the proposed bypass system, special technological operations can be performed, for example, for processing the bottom-hole formation zone.

Claims (1)

A bypass system for a pump installation consisting of a Y-block with a plug, a column of bypass pipes is suspended to one output of it by means of a burst coupling, connector and nozzles, and a pump installation containing a submersible pump and a submersible motor is connected to the second output through a burst sleeve and balancing valve, equipped with a support pipe, while the bypass pipe string and pump unit are fastened together by protectors and a saddle, characterized in that the connector is detachable and consist t of two symmetrical parts with a longitudinal semicylindrical and prismatic recess, hinged along the free edges from the side of the prismatic recess and screws between the recesses with the possibility of additional fastening of the bypass pipe string with the pump unit by covering the last walls of the prismatic recesses, and the bypass pipe at the level of the submersible motor made perforated.

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