Relay lifting process tubular column with double electric submersible pump units suitable for ultra-deep well oil exploitation

Abstract

The utility model relates to the field of oil exploitation machinery, and discloses a relay lifting process pipe column with double electric submersible pump units, which is suitable for oil exploitation of an ultra-deep well. Comprising an upper electric submersible pump unit, a self-sealing cup packer, a jet pump exhaust device, a lower electric submersible pump unit, a centralizer, a submersible cable for transmitting electric power to the electric submersible pump unit, and a cable protection device, in the casing pipe, an upper electric submersible pump unit, a self-sealing cup packer, a jet pump exhaust device and a lower electric submersible pump unit are sequentially and downwards connected through a first oil pipe, a second oil pipe, a third oil pipe and a fourth oil pipe, and well fluid is lifted to the ground through the first oil pipe after being subjected to relay boosting through multi-stage centrifugal pumps in the upper electric submersible pump unit and the lower electric submersible pump unit. The pump is high in lift, large in displacement range, long in service life and suitable for oil exploitation of ultra-deep oil wells.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil exploitation machinery, and particularly relates to a double-submersible electric pump unit relay lifting process pipe column suitable for super-deep well oil exploitation. BACKGROUND

[0002] The maximum lifting height of the existing artificial lifting equipment is a submersible electric pump unit, and due to the limitation of the motor power, shaft torque, shell pressure resistance, pipe column pressure resistance and other limit values of the submersible electric pump unit, the existing submersible electric pump unit has a theoretical maximum lift of no more than 4500 meters. However, for super-deep wells with a depth of 6000 to 10000 meters, the existing submersible electric pump unit with a maximum lift of 4500 meters cannot meet the lifting needs of the super-deep well exploitation in the middle and late stages of development. SUMMARY

[0003] In order to overcome the defects of the prior art, the utility model provides a double-submersible electric pump unit relay lifting process pipe column suitable for super-deep well oil exploitation, and the technical scheme is as follows:

[0004] A double-submersible electric pump unit relay lifting process pipe column suitable for super-deep well oil exploitation, comprising an upper submersible electric pump unit, a self-sealing leather cup packer, a jet pump exhaust device, a lower submersible electric pump unit, a centralizer, a submersible cable for supplying power to the submersible electric pump unit and a cable protection device, wherein the first oil pipe, the second oil pipe, the third oil pipe and the fourth oil pipe are sequentially connected to the upper submersible electric pump unit, the self-sealing leather cup packer, the jet pump exhaust device and the lower submersible electric pump unit in the casing, and the well fluid is lifted to the ground through the first oil pipe after being lifted and pressurized by the multiple-stage centrifugal pumps in the upper and lower submersible electric pump units.

[0005] The upper submersible electric pump unit comprises an upper multi-stage centrifugal pump, an upper gas separator, an upper protector, an upper submersible motor and an upper downhole sensor; the self-sealing leather cup packer comprises an upper center conversion joint, a coupling, an annulus liquid discharge pipe, an upper cable connection package, a cable crossing sealing assembly, a leather cup packer assembly, a lower cable connection package, a communication pipe, a lower coupling, a lower center conversion joint, a packer upper joint and an exhaust pipe coupling; the jet pump exhaust device comprises an oil pipe coupling, an upper joint, a throat pipe, a shell, a nozzle, a nozzle support sleeve, a flow guide pipe, a check valve and a lower joint; the lower submersible electric pump unit comprises a lower multi-stage centrifugal pump, a lower gas separator, a lower protector, a lower submersible motor and a lower downhole sensor; the submersible cable for supplying power to the submersible electric pump unit comprises a double-stranded six-core submersible cable, an upper submersible motor lead-in cable, a lower submersible motor power cable, a lower submersible motor lead-in cable and an upper and lower submersible motor electric lead-in cable connection package.

[0006] The upper part of the upper multi-stage centrifugal pump is connected with the first oil pipe, the upper submersible motor is connected with the upper submersible motor lead-in cable, and the lower part of the upper downhole sensor is connected with the self-sealing packer through the second oil pipe.

[0007] The lower part of the self-sealing packer is connected with the upper part of the jet pump exhaust device through the third oil pipe, the upper part of the exhaust pipe coupling is connected with the exhaust pipeline, and the outlet of the exhaust pipeline is higher than the dynamic liquid level of the upper submersible motor pump unit.

[0008] The cable of the self-sealing packer passes through the upper and lower cable connection packages, and is connected with the lower submersible motor power cable.

[0009] The annular drainage pipe of the self-sealing packer is provided with a drainage hole, and the packer upper connector of the self-sealing packer is provided with a main flow pipe channel, a cable passing channel and an exhaust channel.

[0010] The lower part of the jet pump exhaust device is connected with the lower submersible motor pump unit through the fourth oil pipe.

[0011] The lower submersible motor is connected with the lower submersible motor lead-in cable, and the lower part of the lower submersible motor is connected with the centralizer.

[0012] The double-stranded six-core submersible cable for conveying power of the submersible motor pump unit is connected with the upper submersible motor lead-in cable through the upper submersible motor lead-in cable connection package, and is connected with the lower submersible motor power cable through the lower submersible motor power cable connection package.

[0013] Cable protection devices are arranged at the connection positions of the components of the upper submersible motor pump unit, namely, the connection position of the upper pump discharge head and the upper multi-stage centrifugal pump, the connection position of the upper multi-stage centrifugal pump and the upper gas separator, the connection position of the upper gas separator and the upper protector, the connection position of the upper protector and the upper submersible motor, and the connection position of the upper submersible motor and the upper downhole sensor.

[0014] Compared with the prior art, the double submersible motor pump unit force lifting process pipe column suitable for super deep well oil exploitation has the following advantages:

[0015] 1. High lift, large displacement range.

[0016] 2. Adjustable working parameters.

[0017] 3. The lifting height is doubled without increasing the motor power limit, the shaft torque limit, the shell and the pressure limit of the pipe column of a single set of unit.

[0018] 4. It can be widely used in oil exploitation process engineering, and is especially suitable for super deep well oil exploitation.

[0019] 5. The structure is reasonable, safe and reliable, easy to install and maintain, and is beneficial to popularization. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall layout structure of the present application;

[0021] Figure 1 (1) is Figure 1 is an enlarged schematic diagram of the structure of the first part from top to bottom;

[0022] Figure 1 (2) is Figure 1 is an enlarged schematic diagram of the structure of the second part from top to bottom;

[0023] Figure 1 (3) is Figure 1 (2) is an enlarged schematic diagram of the A-A cross-sectional structure

[0024] Figure 1 (4) is Figure 1 is an enlarged schematic diagram of the structure of the third part from top to bottom;

[0025] Figure 1 (5) is Figure 1 is an enlarged schematic diagram of the structure of the fourth part from top to bottom;

[0026] In the figure: 1 double stranded six core electric submersible cable, 2 upper electric submersible motor lead cable connection package, 3 upper electric submersible motor lead cable, 4 lower electric submersible motor power cable connection package, 5 lower electric submersible motor power cable, 6 first oil pipe, 7 casing, 8 upper electric submersible pump unit, 8-1 upper multi-stage centrifugal pump, 8-2 upper gas separator, 8-3 upper protector, 8-4 upper electric submersible motor, 8-5 upper downhole sensor, 8-6 upper separator suction inlet, 8-7 upper pump discharge head, 9 second oil pipe, 10 gas discharge pipeline, 11 self-sealing cup packer, 11-1 upper central transition joint, 11-2 coupling, 11-3 annular discharge pipe, 11-4 upper cable connection package, 11-5 cable crossing sealing assembly, 11-6 cup packer assembly, 11-7 lower cable connection package, 11-8 communication pipe, 11-9 lower coupling, 11-10 lower central transition joint, 11-11 discharge hole, 11-12 main flow oil pipe passage, 11-13 cable crossing passage, 11-14 gas discharge passage, 11-15 packer upper joint, 11-16 gas pipe coupling, 12 third oil pipe, 13 jet pump gas discharge device, 13-1 oil pipe coupling, 13-2 upper joint, 13-3 throat pipe, 13-4 shell, 13-5 nozzle, 13-6 nozzle support sleeve, 13-7 flow guide pipe, 13-8 check valve, 13-9 lower joint, 14 lower electric submersible motor lead cable connection package, 15 fourth oil pipe, 16 lower electric submersible motor lead cable, 17 lower electric submersible pump unit, 17-1 lower multi-stage centrifugal pump, 17-2 lower gas separator, 17-3 lower protector, 17-4 lower electric submersible motor, 17-5 lower downhole sensor, 17-6 suction inlet, 17-7 lower pump discharge head, 18 centralizer, 19 cable protection device DETAILED DESCRIPTION

[0027] The utility model will be described in detail below in combination with the embodiments and drawings. Embodiment 1

[0028] Reference Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4) and Figure 1(5). A dual submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, comprising an integrated upper submersible electric pump unit 8, a self-sealing leather cup packer 11, a jet pump exhaust device 13, a lower submersible electric pump unit 17, a centralizer 18, a submersible cable for transmitting power to the submersible electric pump unit and a cable protection device 19 connected in sequence; the upper submersible electric pump unit 8 comprises an upper multi-stage centrifugal pump 8-1, an upper gas separator 8-2, an upper protector 8-3, an upper submersible electric motor 8-4, an upper downhole sensor 8-5 and an upper pump discharge head 8-7; the self-sealing leather cup packer 11 comprises an upper center transition joint 11-1, a coupling 11-2, an annulus liquid discharge pipe 11-3, an upper cable connection package 11-4, a cable crossing sealing assembly 11-5, a leather cup packer assembly 11-6, a lower cable connection package 11-7, a communication pipe 11-8, a lower coupling 11-9, a lower center transition joint 11-10, a packer upper joint 11-15 and an exhaust pipe coupling 11-16; the jet pump exhaust device 13 comprises a tubing coupling 13-1, an upper joint 13-2, a throat pipe 13-3, a shell 13-4, a nozzle 13-5, a nozzle support sleeve 13-6, a flow guide pipe 13-7, a check valve 13-8 and a lower joint 13-9; the lower submersible electric pump unit 17 comprises a lower multi-stage centrifugal pump 17-1, a lower gas separator 17-2, a lower protector 17-3, a lower submersible electric motor 17-4, a lower downhole sensor 17-5 and a lower pump discharge head 17-7; the submersible cable for transmitting power to the submersible electric pump unit comprises a double-stranded six-core submersible cable 1, an upper submersible motor lead-in cable connection package 2, an upper submersible motor lead-in cable 3, a lower submersible motor power cable connection package 4, a lower submersible motor power cable 5, a lower submersible motor lead-in cable connection package 14 and a lower submersible motor lead-in cable 16. Example 2

[0029] Reference Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4) and Figure 1 (5). A dual submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, based on the technical solution described in Example 1, the upper multi-stage centrifugal pump 8-1 is connected to the first tubing 6 through the upper pump discharge head 8-7, the upper submersible electric motor 8-4 is connected to the upper submersible motor lead-in cable 3, the lower part of the upper downhole sensor 8-5 is connected to the self-sealing leather cup packer 11, the jet pump exhaust device 13 and the lower submersible electric pump unit 17 in sequence through the second tubing 9, the third tubing 12 and the fourth tubing 15, the lower submersible electric motor 17-4 is connected to the lower submersible motor lead-in cable 16, and the lower part of the lower submersible electric motor 17-4 is connected to the centralizer 18. Example 3

[0030] Referring to Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4), and Figure 1 (5). A dual submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, on the basis of the technical solution described in Embodiment 1, the upper part of the exhaust pipe coupling 11-16 of the self-sealing rubber bowl packer is connected with the exhaust pipe line 10, the cable passes through the upper and lower ends of the sealing assembly 11-5, passes through the upper cable connection package 11-4 and the lower cable connection package 11-7, and is connected with the lower submersible motor power cable 5 disconnected at this point. Embodiment 4

[0031] Referring to Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4), and Figure 1 (5). A dual submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, on the basis of the technical solution described in Embodiment 1, the annulus liquid discharge pipe 11-3 of the self-sealing rubber bowl packer is provided with a liquid discharge hole 11-11, and the upper connector 11-15 of the self-sealing rubber bowl packer is provided with a main flow tubing passage 11-12, a cable passing passage 11-13 and an exhaust passage 11-14. Embodiment 5

[0032] Referring to Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4), and Figure 1 (5). A dual submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, on the basis of the technical solution described in Embodiment 1, the dual six-core submersible cable 1 for delivering power to the submersible electric pump unit is connected with the upper submersible motor lead cable 3 through the upper submersible motor lead cable connection package 2, is connected with the lower submersible motor power cable 5 through the lower submersible motor power cable connection package 4, and the lower submersible motor power cable 5 is connected with the lower submersible motor lead cable 16 through the lower submersible motor lead cable connection package 14. Embodiment 6

[0033] Referring to Figure 1 , Figure 1 (1), Figure 1 (2), Figure 1 (3), Figure 1 (4), and Figure 1(5). A double submersible electric pump unit relay lifting process pipe column suitable for ultra-deep well oil exploitation, on the basis of the technical solution described in Embodiment 1, cable protection devices 19 are arranged at the connection positions of each component of the upper submersible electric pump unit 8, that is, the connection position of the upper pump discharge head 8-7 and the upper multi-stage centrifugal pump 8-1, the connection position of the upper multi-stage centrifugal pump 8-1 and the upper gas separator 8-2, the connection position of the upper gas separator 8-2 and the upper protector 8-3, the connection position of the upper protector 8-3 and the upper submersible electric motor 8-4, and the connection position of the upper submersible electric motor 8-4 and the upper downhole sensor 8-5.

[0034] In order for those skilled in the art to better understand the present application, the basic working principle of the present application is briefly introduced as follows:

[0035] According to the oil well productivity and oil layer static pressure, dynamic pressure and other oil well data, the type and working parameters of the upper and lower submersible electric pump units are configured, and the installation depth of the upper submersible electric pump unit 8 and the lower submersible electric pump unit 17 is determined, and then the components of the unit are lowered into the predetermined position of the oil well according to the overall layout structure schematic diagram. Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure 1 Figure After the unit installation is completed, the lower submersible electric pump unit 17 is started to work through the ground control cabinet of the lower submersible electric pump unit 17, the well fluid enters the lower gas separator 17-2 and the lower multi-stage centrifugal pump 17-1 through the suction port 17-6, the well fluid is pressurized by the lower multi-stage centrifugal pump 17-1, and then the well fluid is lifted to the upper annular space of the self-sealing leather cup packer 11 through the fourth oil pipe 15, the jet pump exhaust device 13, the third oil pipe 12, the self-sealing leather cup packer 11, the annular drainage pipe 11-3 and the drainage hole 11-11. At this time, the self-sealing leather cup packer 11 plays a sealing role under the action of the upper liquid column pressure, preventing the well fluid from returning to the lower annular space of the self-sealing leather cup packer 11. When the well fluid continues to rise to the required submergence position of the upper submersible electric pump unit 8 through the upper annular space of the self-sealing leather cup packer 11 (about 300 meters upward from the upper separator suction port 8-6, and the data is transmitted to the ground control system by the upper downhole sensor 8-5), the upper submersible electric pump unit is started through the ground control cabinet of the upper submersible electric pump unit 8. After the upper submersible electric pump unit 8 is started, the well fluid enters the upper gas separator 8-2 and the upper multi-stage centrifugal pump 8-1 through the upper separator suction port 8-6, and then the well fluid is lifted to the ground through the first oil pipe 6 after being pressurized by the upper multi-stage centrifugal pump. Thus, the relay lifting process of the double submersible electric pump unit on the well fluid is completed.

[0036] The gas in the lower annular space of the self-sealing cup packer 11 can be mixed into the well fluid and discharged to the upper part of the self-sealing cup packer 11 through the jet pump exhaust device 13, or can be discharged to above the dynamic fluid level of the upper submersible electric pump unit 8 through the exhaust passage 11-14 on the self-sealing cup packer and the exhaust pipeline 10. The outlet of the exhaust pipeline 10 is higher than the dynamic fluid level of the upper submersible electric pump unit 8. The selection of the exhaust scheme depends on the size of the casing 7. If the internal space of the casing 7 is sufficient to accommodate the exhaust pipeline 10, the exhaust scheme through the exhaust pipeline is preferred.

[0037] The ground control cabinet of the upper submersible electric pump unit 8 and the lower submersible electric pump unit 17 adopts a variable frequency control cabinet, which facilitates the adjustment of the working parameters of the upper and lower submersible electric pump units to ensure that the working parameters of the upper and lower submersible electric pump units match each other.

Claims

1. A process tubing string for a dual submersible electric pump unit relay lift suitable for ultra-deep well oil extraction, characterized in that: The upper submersible electric pump unit (8), the self-sealing cup packer (11), the jet pump exhaust device (13), the lower submersible electric pump unit (17), the centralizer (18), the submersible electric cable and the cable protection device (19) for delivering power to the submersible electric pump unit are sequentially connected by the first oil pipe (6), the second oil pipe (9), the third oil pipe (12) and the fourth oil pipe (15) in the casing (7), and the well fluid is lifted to the ground through the first oil pipe (6) after being boosted by the upper multi-stage centrifugal pump (8-1) in the upper submersible electric pump unit (8) and the lower multi-stage centrifugal pump (17-1) in the lower submersible electric pump unit (17).

2. The dual submersible electric pump assembly tandem lift work string for use in ultra-deep well oil production of claim 1, wherein: The upper submersible electric pump unit (8) comprises an upper multi-stage centrifugal pump (8-1), an upper gas separator (8-2), an upper protector (8-3), an upper submersible electric motor (8-4) and an upper downhole sensor (8-5); the self-sealing cup packer (11) comprises an upper central transition joint (11-1), a coupling (11-2), an annulus liquid discharge pipe (11-3), an upper cable connection package (11-4), a cable crossing sealing assembly (11-5), a cup packer assembly (11-6), a lower cable connection package (11-7), a communication pipe (11-8), a lower coupling (11-9), a lower central transition joint (11-10), a packer upper joint (11-15) and a gas exhaust pipe coupling (11-16); the jet pump exhaust device (13) comprises an oil pipe coupling (13-1), an upper joint (13-2), a throat pipe (13-3), a shell (13-4), a nozzle (13-5), a nozzle support sleeve (13-6), a flow guide pipe (13-7), a check valve (13-8) and a lower joint (13-9); the lower submersible electric pump unit (17) comprises a lower multi-stage centrifugal pump (17-1), a lower gas separator (17-2), a lower protector (17-3), a lower submersible electric motor (17-4) and a lower downhole sensor (17-5); the submersible electric cable for delivering power to the submersible electric pump unit comprises a double-stranded six-core submersible electric cable (1), an upper submersible electric motor lead-in cable (3), a lower submersible electric motor power cable connection package (4), a lower submersible electric motor power cable (5), a lower submersible electric motor lead-in cable (16), an upper submersible electric motor lead-in cable connection package (2) and a lower submersible electric motor lead-in cable connection package (14).

3. The dual electric submersible pump assembly tandem lift work string suitable for ultra-deep well oil production of claim 2, wherein: The upper part of the upper multi-stage centrifugal pump (8-1) is connected with the first oil pipe (6), the upper submersible electric motor (8-4) is connected with the upper submersible electric motor lead-in cable (3), and the lower part of the upper downhole sensor (8-5) is connected with the self-sealing cup packer (11) through the second oil pipe (9).

4. The dual electric submersible pump assembly tandem lift work string for ultra-deep well oil production of claim 2, wherein: The lower part of the self-sealing skin bowl packer (11) is connected with the upper part of the jet pump exhaust device (13) through the third oil pipe (12), and the upper part of the exhaust pipe coupling (11-16) is provided with and connected with the exhaust pipe line (10), and the outlet of the exhaust pipe line (10) is higher than the dynamic liquid level of the upper submersible electric pump unit (8).

5. The dual electric submersible pump assembly tandem lift work string for ultra-deep well oil production of claim 2, wherein: The cable penetrating sealing assembly (11-5) of the self-sealing skin bowl packer (11) is connected with the lower submersible electric motor power cable (5) through the upper cable connecting bag (11-4) and the lower cable connecting bag (11-7).

6. The dual electric submersible pump assembly tandem lift work string for ultra-deep well oil production of claim 2, wherein: The annular drainage pipe (11-3) of the self-sealing skin bowl packer (11) is further provided with a drainage hole (11-11), and the packer upper connector (11-15) of the self-sealing skin bowl packer (11) is further provided with a main flow oil pipe passage (11-12), a cable penetrating passage (11-13) and an exhaust passage (11-14).

7. The dual electric submersible pump assembly for use in the process string for the booster lift in the ultra-deep well oil production according to claim 2, characterized in that: The upper part of the jet pump exhaust device (13) is connected with the self-sealing skin bowl packer through the third oil pipe (12), and the lower part is connected with the lower submersible electric pump unit (17) through the fourth oil pipe (15).

8. The dual electric submersible pump assembly for use in the process string for the booster lift in the ultra-deep well oil production according to claim 2, characterized in that: The lower submersible electric motor (17-4) is connected with the lower submersible electric motor lead cable (16), and the lower part of the lower submersible electric motor (17-4) is connected with the centralizer (18).

9. The dual electric submersible pump assembly for use in the process string for the booster lift in the ultra-deep well oil production according to claim 2, characterized in that: The double-stranded six-core submersible cable (1) for supplying power to the submersible electric pump unit is connected with the upper submersible electric motor lead cable (3) through the upper submersible electric motor lead cable connecting bag (2), connected with the lower submersible electric motor power cable (5) through the lower submersible electric motor power cable connecting bag (4), and connected with the lower submersible electric motor lead cable (16) through the lower submersible electric motor lead cable connecting bag (14).

10. The dual electric submersible pump assembly for use in the process string for the relay lifting of oil in the ultra-deep well according to claim 2, characterized in that: The cable protection device (19) is arranged at the connection position of each component of the upper submersible electric pump unit (8), namely, the connection position of the upper pump discharge head (8-7) and the upper multi-stage centrifugal pump (8-1), the connection position of the upper multi-stage centrifugal pump (8-1) and the upper gas separator (8-2), the connection position of the upper gas separator (8-2) and the upper protector (8-3), the connection position of the upper protector (8-3) and the upper submersible electric motor (8-4), and the connection position of the upper submersible electric motor (8-4) and the upper downhole sensor (8-5).

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