Integrated equipment system for manual lifting and sewage reinjection of oil well

Abstract

The invention relates to an integrated equipment system for manual lifting and sewage reinjection of an oil well, and the system comprises a lifting assembly which is used for lifting crude oil to the ground; the reinjection assembly is used for injecting the sewage into the stratum; and the top of the bidirectional driving submersible motor is connected with the lifting assembly, the bottom of the bidirectional driving submersible motor is connected with the reinjection assembly, and the bidirectional driving submersible motor is used for providing power for crude oil lifting and sewage injection. Two pumps are driven to rotate in the same direction through one motor and one rotating direction, and liquid thrust in two directions is formed.

Description

Technical Field

[0001] The invention relates to the technical field of oil lifting and reinjection, and in particular to an integrated equipment system for artificial lifting of oil wells and sewage reinjection. Background Art

[0002] Crude oil is an important part of my country's resources, accounting for about 45% of the total resources. The energy of oil wells is gradually exhausted, and the water content is gradually increasing. Whether it is on land, offshore or even on remote land, oil wells have entered the medium and high water content development stage, with a comprehensive water content of more than 95%. The existing process technology consumes a lot of energy and the pollution source is difficult to control, causing serious damage to the atmosphere, land and drinking water. The treatment of oily wastewater has become the biggest problem in oil field production.

[0003] It is estimated that there are 1 million wells in the world that use modern traditional artificial lift. Usually, submersible electric pumps, single screw pumps, and pumping units are directly put into production according to the well conditions. Submersible electric pump lift accounts for 10%, about 100,000 wells. A relatively economical way to reduce water output in foreign oil fields is to pre-separate the oil and water mixture at the bottom of the well. This method is to use a pre-oil-water separator at the bottom of the well to pressurize the high-water crude oil and complete the oil-water separation through an oil-water separator. Most of the wastewater with extremely low oil concentration is directly injected into the water injection layer, and the crude oil separated and concentrated by the oil-water separator is extracted from the ground by an electric pump.

[0004] At present, the artificial lifting technologies commonly used for crude oil extraction in offshore oil fields mainly include: jet pump injection and production integrated technology. The reason is that the jet pump needs to be equipped with a ground power fluid booster system and a water treatment system, which has the problem of occupying a large area. At the same time, the pump efficiency and displacement also limit its scope of use.

[0005] The artificial lifting technologies commonly used for crude oil extraction in onshore oil fields mainly include: integrated injection and production lifting technology of oil well pumps, surface drive full single screw pump lifting technology, etc.; among them, single screw pumps and oil well pumps are only suitable for working conditions with small displacement, low head and low sand content.

[0006] In summary, the lifting technologies currently available on the market for crude oil extraction all have certain limitations, so there is an urgent need to develop an integrated equipment system for oil well artificial lifting and sewage reinjection. Summary of the invention

[0007] In view of the above problems, the purpose of the present invention is to provide an integrated equipment system for artificial lifting of oil wells and sewage reinjection, which drives two pumps to rotate in the same direction with one motor in one direction, thereby forming liquid thrust in two directions.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The integrated equipment system for artificial lifting of oil wells and sewage reinjection described in the present invention includes: a lifting component for lifting crude oil to the ground; a reinjection component for injecting sewage into the formation; a bidirectional drive submersible motor, the top of which is connected to the lifting component and the bottom of which is connected to the reinjection component, for providing power for crude oil lifting and sewage injection.

[0010] The integrated equipment system, preferably, the lifting assembly includes a first oil pipe, an artificial lift wide-width submersible pump, a gas-liquid separation device, a split-type downhole oil-water separation device and a motor protector which are connected in series in sequence; the motor protector is connected to the bidirectional drive submersible motor; the artificial lift wide-width submersible pump is used to lift the separated oil to the ground; the gas-liquid separation device is used to prevent the gas from affecting the artificial lift electric pump, so as to discharge the gas in the oil and gas into the casing annulus through the gas-liquid separation device; the split-type downhole oil-water separation device is used to separate oil and water; the motor protector is used to supply motor oil to the bidirectional drive submersible motor, and to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

[0011] In the integrated equipment system, preferably, the lifting assembly also includes a power cable, the power cable is connected to the bidirectional drive submersible motor, and the power cable is used to provide power for the bidirectional drive submersible motor.

[0012] The integrated equipment system, preferably, the reinjection assembly includes a flow guide cover + upper and lower sealing devices and a reinjection wide-width electric pump, an axial thrust device, a liquid extraction joint device, a one-way valve + bursting valve device, a downhole controller device, a telescopic safety device, a second oil pipe and a separator connected in series in sequence; one end of the flow guide cover + upper and lower sealing device is connected to the water phase outlet of the split downhole oil-water separation device, and the other end is connected to the reinjection wide-width electric pump to form a closed channel between the split downhole oil-water separation device and the reinjection wide-width electric pump to guide the separated water into the reinjection wide-width electric pump; the reinjection wide-width electric pump is used to reinject the separated sewage into the formation; the axial thrust device The force device is used to eliminate the gravity generated by the deadweight of the transmission shaft when the wide-width electric pump for reinjection is inverted; the liquid extraction joint device is used to introduce the separated well fluid to the ground to complete the sampling work; the one-way valve + bursting valve device is used to prevent the well pressure from rising and prevent the equipment from being damaged due to excessive well pressure; the downhole controller device is used to control the downhole pressure and the amount of injected liquid; the telescopic safety device is used to prevent the pressure deformation of the unit after the unit is lowered into the well and sealed, and to lift the unit after it is lowered into the well to leave a buffer margin. At the same time, a safety pin is provided to prevent scaling and sand burial from causing difficulties in lifting the unit pump, and the safety pin is disconnected; the second oil pipe is used to transport the separated high-pressure sewage; the separator is used to transport the high-pressure sewage to the formation.

[0013] In the integrated equipment system, preferably, the reinjection assembly also includes a downhole operating condition testing device and an operating condition protection device; the downhole operating condition testing device and the operating condition protection device are sequentially arranged between the bidirectional drive submersible motor and the reinjection wide-range electric pump; the downhole operating condition testing device is used to provide a signal source for ambient temperature, winding temperature, suction port pressure, X, Y, and Z vibrations, and is also used to provide torque transmission at the upper and lower ends; the operating condition protection device is used to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

[0014] The integrated equipment system, preferably, the reinjection component also includes a sampling tube / signal cable, and the sampling tube / signal cable is respectively connected to the liquid sampling joint device and the downhole controller device, and is used to transmit the control signal of the ground controller to the liquid sampling joint device and the downhole controller device, so as to realize the sampling work and realize the detection of downhole flow, pump working pressure, and formation pressure and control and adjust them.

[0015] In the integrated equipment system, preferably, the bidirectional drive submersible motor includes a stator and a rotor that cooperate in sequence.

[0016] In the integrated equipment system, preferably, the bidirectional drive submersible motor is a low-temperature motor, a medium-temperature motor, or a high-temperature motor.

[0017] The present invention adopts the above technical solution, which has the following advantages:

[0018] The present invention adopts a bidirectional drive submersible motor, which has high pump efficiency and large volumetric efficiency. The present invention is an integrated equipment for artificial lifting of oil wells and sewage reinjection, which has the advantages of small footprint and easy maintenance, and can be applied to exploitation in a wide flow range. The present invention can also be used for exploitation of high-gas-content wells and has the ability to process gas from high-gas-content wells.

[0019] The integrated artificial lift and sewage reinjection equipment of the present invention can be applied to the exploitation of various thin oils or thick oils at sea and on land; since the structure of the integrated artificial lift and sewage reinjection is short and compact, the integrated artificial lift and sewage reinjection equipment of the present invention can be applied to the exploitation of large well inclination or horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0021] Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0022] Figure 1It is a structural schematic diagram of the integrated equipment system for oil well artificial lifting and sewage reinjection according to the present invention.

[0023] The reference numerals in the figures are as follows:

[0024] 1-first oil pipe; 2-artificial lift wide-width submersible pump; 3-gas-liquid separation device; 4-power cable; 5-split downhole oil-water separation device; 6-motor protector; 7-bidirectional drive submersible motor; 8-downhole working condition test device; 9-working condition protection device; 10-sampling tube / signal cable; 11-reinjection wide-width electric pump; 12-axial thrust device; 13-liquid extraction joint device; 14-one-way valve + burst valve device; 15-downhole controller device; 16-telescopic safety device; 17-second oil pipe; 18-separator; 19-flow guide cover + upper and lower sealing devices. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0026] The present invention provides an integrated equipment system for artificial lifting of oil wells and sewage reinjection, which adopts an underground bidirectional submersible oil motor, the upper end of which drives an underground artificial lifting wide-width submersible oil pump, and the lower end drives an underground reinjection wide-width electric pump, thereby forming an oil well injection and production function; the system has the advantages of high pump efficiency, high volumetric efficiency, low energy consumption, less pollution, small footprint, and easy maintenance, and can be applied to a wider flow range.

[0027] like Figure 1 As shown, the integrated equipment system for oil well artificial lifting and sewage reinjection provided by the present invention includes:

[0028] A lifting assembly, used to lift the crude oil to the surface;

[0029] A reinjection assembly for injecting wastewater into the formation;

[0030] The bidirectionally driven submersible motor 7 has its top connected to the lifting assembly and its bottom connected to the reinjection assembly, and is used to provide power for crude oil lifting and sewage injection.

[0031] In the above embodiment, preferably, the lifting assembly includes a first oil pipe 1, an artificial lift wide-width submersible pump 2, a gas-liquid separation device 3, a split downhole oil-water separation device 5 and a motor protector 6 which are connected in series in sequence; the motor protector 6 is connected to the bidirectional drive submersible motor 7; the artificial lift wide-width submersible pump 2 is used to lift the separated oil to the ground; the gas-liquid separation device 3 is used to prevent the gas from affecting the artificial lift electric pump, so as to discharge the gas in the oil and gas into the casing annulus through the gas-liquid separation device; the split downhole oil-water separation device 5 is used to separate oil and water; the motor protector 6 is used to supply motor oil to the bidirectional drive submersible motor, and to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

[0032] In the above embodiment, preferably, the lifting assembly further includes a power cable 4 , which is connected to the bidirectional drive submersible motor 7 , and the power cable 4 is used to provide power to the bidirectional drive submersible motor 7 .

[0033] In the above embodiment, preferably, the reinjection assembly includes a flow guide cover + upper and lower sealing devices 19 and a reinjection wide-width electric pump 11, an axial thrust device 12, a liquid extraction joint device 13, a one-way valve + burst valve device 14, a downhole controller device 15, a telescopic safety device 16, a second oil pipe 17 and a separator 18 connected in series in sequence; one end of the flow guide cover + upper and lower sealing device 19 is connected to the water phase outlet of the split downhole oil-water separator 5, and the other end thereof is connected to the reinjection wide-width electric pump 11 to form a closed channel between the split downhole oil-water separator 5 and the reinjection wide-width electric pump 11, and to guide the separated water into the reinjection wide-width electric pump 11; the reinjection wide-width electric pump 11 is used to reinject the separated sewage into the formation;

[0034] The axial thrust device 12 is used to eliminate the gravity generated by the deadweight of the transmission shaft when the wide-range electric pump for reinjection is inverted;

[0035] The liquid collection joint device 13 is used to introduce the separated well fluid to the ground to complete the sampling work;

[0036] The one-way valve + burst valve device 14 is used to prevent the well pressure from rising and to prevent equipment damage caused by excessive well pressure;

[0037] The downhole controller device 15 is used to control the downhole pressure and the amount of injected fluid;

[0038] The telescopic safety device 16 is used to prevent the unit from being deformed by pressure after the unit is lowered into the well and sealed. After the unit is lowered into the well and in place, the unit is lifted up to leave a buffer margin. At the same time, a safety pin is provided to prevent scaling and sand burial from causing difficulty in lifting the unit pump, which is disconnected from the safety pin;

[0039] The second oil pipe 17 is used to transport the separated high-pressure sewage;

[0040] The separator 18 is used to transport high-pressure sewage to the formation.

[0041] It should be noted that the downhole telescopic safety device is equipped with a travel limit, which forms a tension state when going down the well. After being sealed, the telescopic safety device prevents the unit from being squeezed and allows the unit to work freely. At the same time, it prevents damage to the unit caused by scaling and sand burial when lifting the well. A safety pin is set. Once resistance is generated during well lifting, the safety pin will be disconnected to facilitate well lifting operations.

[0042] In the above embodiment, preferably, the reinjection assembly also includes a downhole operating condition testing device 8 and an operating condition protection device 9; the downhole operating condition testing device 8 and the operating condition protection device 9 are sequentially arranged between the bidirectional drive submersible motor 7 and the reinjection wide-band electric pump 11; the downhole operating condition testing device 8 is used to provide a signal source for ambient temperature, winding temperature, suction port pressure, X, Y, and Z vibrations, and is also used to provide torque transmission at the upper and lower ends; the operating condition protection device 9 is used to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

[0043] In the above embodiment, preferably, the reinjection component also includes a sampling tube / signal cable 10, which is respectively connected to the liquid sampling joint device 13 and the downhole controller device 15, and is used to transmit the control signal of the ground controller to the liquid sampling joint device and the downhole controller device, so as to realize the sampling work and realize the detection of downhole flow, pump working pressure, and formation pressure and control and adjust them.

[0044] The sampling tube / signal cable refers to a device that can transmit the control signal of the ground controller to the liquid sampling connector device and to the downhole controller device.

[0045] In the above embodiment, preferably, the bidirectional drive submersible motor 7 includes a stator and a rotor that match in sequence; wherein, the motor head and tail of the bidirectional drive submersible motor can provide power output, and the upper motor protector 6 and the lower working condition protection device 9 provide axial sealing and power transmission functions, and drive the upper centrifugal pump and the lower centrifugal pump in two axial directions at the same time.

[0046] In the above embodiment, preferably, the bidirectional drive submersible motor 7 is a low temperature motor (≤204° C.) or a medium temperature motor (204-250° C.) or a high temperature motor (250-370° C.).

[0047] It should be noted that the first oil pipe and the wellhead can be connected by a sealing threaded buckle, and the first oil pipe and the second oil pipe can be selected from a variety of specifications such as 4-1 / 2", 3-1 / 2", 2-7 / 8" and so on.

[0048] The bidirectionally driven submersible motor 7 is used as the power source of the downhole lifting and reinjection electric pump. It is not limited to the three-phase asynchronous motor, but a permanent magnet synchronous motor can also be used. It has a small size, high efficiency, and a comprehensive energy saving effect of about 30%. The integrated equipment for artificial lifting and sewage reinjection in the embodiment of the present invention is mainly aimed at the exploitation of high water-content oil wells, gas-containing oil wells, heavy oil and conventional thin oil under special working conditions.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated equipment system for artificial lifting of oil wells and sewage reinjection, characterized in that: include: A lifting assembly, used to lift the crude oil to the surface; A reinjection assembly for injecting wastewater into the formation; A bidirectionally driven submersible motor, the top of which is connected to the lifting assembly, and the bottom of which is connected to the reinjection assembly, is used to provide power for crude oil lifting and sewage injection.

2. The integrated equipment system according to claim 1, characterized in that: The lifting assembly comprises a first oil pipe, an artificial lifting wide-range submersible oil pump, a gas-liquid separation device, a split downhole oil-water separation device and a motor protector connected in series in sequence; The motor protector is connected to the bidirectional drive submersible motor; The artificial lift wide-range submersible oil pump is used to lift the separated oil to the ground; The gas-liquid separation device is used to prevent the gas from affecting the artificial lift electric pump, so that the gas in the oil and gas is discharged into the casing annulus through the gas-liquid separation device; The split downhole oil-water separation device is used to separate oil and water; The motor protector is used to supply motor oil to the bidirectional drive submersible motor, and to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

3. The integrated equipment system according to claim 2, characterized in that: The lifting assembly also includes a power cable, which is connected to the bidirectional drive submersible motor and is used to provide power for the bidirectional drive submersible motor.

4. The integrated equipment system according to claim 2, characterized in that: The reinjection assembly includes a flow guide cover + upper and lower sealing devices and a reinjection wide-range electric pump, an axial thrust device, a liquid extraction joint device, a one-way valve + burst valve device, a downhole controller device, a telescopic safety device, a second oil pipe and a separator connected in series in sequence; One end of the deflector + upper and lower sealing device is connected to the water phase outlet of the split downhole oil-water separator, and the other end is connected to the reinjection wide-width electric pump to form a closed channel between the split downhole oil-water separator and the reinjection wide-width electric pump to guide the separated water into the reinjection wide-width electric pump; The wide-range reinjection electric pump is used to reinject the separated sewage into the stratum; The axial thrust device is used to eliminate the gravity generated by the deadweight of the transmission shaft when the wide-range electric pump for reinjection is inverted; The liquid collection joint device is used to introduce the separated well fluid to the ground to complete the sampling work; The one-way valve + burst valve device is used to prevent the well pressure from rising and to prevent equipment damage caused by excessive well pressure; The downhole controller device is used to control the downhole pressure and the amount of injected liquid; The telescopic safety device is used to prevent the unit from being deformed by pressure after the unit is lowered into the well and sealed. After the unit is lowered into the well, the unit is lifted up to leave a buffer margin. A safety pin is also provided to prevent scaling and sand burial from causing difficulty in lifting the unit pump, which is disconnected from the safety pin. The second oil pipe is used to transport the separated high-pressure sewage. The separator is used to transport high-pressure sewage to the formation.

5. The integrated equipment system according to claim 4, characterized in that: The reinjection assembly further includes a downhole working condition testing device and a working condition protection device; the downhole working condition testing device and the working condition protection device are sequentially arranged between the bidirectional drive submersible motor and the reinjection wide-range electric pump; The downhole working condition test device is used to provide a signal source for the ambient temperature, winding temperature, suction port pressure, X, Y, and Z vibrations, and is also used to provide torque transmission at the upper and lower ends; The working condition protection device is used to balance the pressure difference between the motor oil and the well fluid, eliminate the axial force of the pump, and transmit power.

6. The integrated equipment system according to claim 4, characterized in that: The reinjection assembly also includes a sampling tube / signal cable, which is respectively connected to the liquid sampling joint device and the downhole controller device, and is used to transmit the control signal of the ground controller to the liquid sampling joint device and the downhole controller device, so as to realize sampling work and realize the detection of downhole flow, pump working pressure, and formation pressure and perform control and adjustment.

7. The integrated equipment system according to claim 1, characterized in that: The bidirectional drive submersible motor comprises a stator and a rotor which are matched in sequence.

8. The integrated equipment system according to claim 7, characterized in that: The bidirectional drive submersible motor is a low temperature motor, a medium temperature motor or a high temperature motor.

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