A thickened oil mixed thin electric pump well casing pressure device

Abstract

The utility model relates to a kind of thick oil mixes thin electric pump well casing pressure release device, comprising: pressure gauge tee, with casing pressure release table communication;Separator, for separating thin oil and gas, the separator has housing and the separating mechanism in the housing, the housing has inlet and outlet, the inlet with the pressure gauge tee communication;Controller, including the control pipe with the outlet of the separator communication, control valve and temperature-pressure integrated table being located in the control pipe, the temperature-pressure integrated table is located in the upstream of the control valve, the control valve opens or closes according to the numerical value of the temperature-pressure integrated table.The utility model solves the problem of production stop in casing pressure release of mixing thin well, provides a kind of thick oil mixes thin electric pump well casing pressure release device, can realize casing pressure release without production stop.

Description

Technical Field

[0001] This utility model relates to the field of heavy oil dilution development, specifically a heavy oil dilution electric pump well pressure relief device. Background Technology

[0002] In recent years, with the advancement of oilfield development, water and gas injection have become commonplace. As the gas injection volume of single wells and well groups increases, after gas injection replenishes near-wellbore deficits, gas backflow occurs during well opening. With changes in formation energy, conventional mechanical pumping production can no longer meet oilfield production demands, making electric submersible pumps (ESPs) a trend in fluid extraction. After an ESP is installed in a gas injection well, the large amount of gas can cause gas to enter the pump through the suction inlet, leading to gas lock and reducing pump efficiency. To minimize the impact of gas on pump efficiency, continuous casing pressure relief is required during ESP well production. For heavy oil blending wells, one wing of the wellhead production tree casing is the blending oil inlet, and the other wing is the cable. If pressure relief is applied during blending, it is impossible to prevent thinner oil from flowing out of the pressure relief port. Therefore, it is impossible to achieve simultaneous production and casing pressure relief; production must be stopped during casing pressure relief, which negatively impacts production efficiency. Summary of the Invention

[0003] This invention solves the problem of production shutdown required for diluent wells during casing pressure relief, and provides a casing pressure relief device for heavy oil diluent electric pump wells that can achieve casing pressure relief without production shutdown.

[0004] The present invention relates to a heavy oil dilution electric pump well pressure relief device, comprising:

[0005] The pressure gauge tee is connected to the pressure gauge cock;

[0006] A separator for separating light oil and gas, the separator having a housing and a separation mechanism located within the housing, the housing having an inlet and an outlet, the inlet being connected to the pressure gauge tee;

[0007] The controller includes a control pipe communicating with the outlet of the separator, a control valve disposed on the control pipe, and a temperature and / or pressure gauge located upstream of the control valve, the control valve opening or closing according to the value of the test gauge.

[0008] Preferably, the inlet is located at the bottom of the housing, the outlet is located at the top of the housing, and the separator includes multiple layers of separation mechanisms arranged vertically.

[0009] Preferably, each separation mechanism includes a compression plate, a dispersion plate located above the compression plate, and a mist-catching net located between the compression plate and the dispersion plate. The compression plate has a compression through hole in the middle, and the total flow area of ​​all dispersion through holes in a dispersion plate is greater than the flow area of ​​a compression through hole.

[0010] Preferably, adjacent compression plates and dispersion plates are supported by support rods, which are fixed to the compression plates or dispersion plates.

[0011] Preferably, the separator housing includes a cylindrical body, a top located at the upper end of the cylindrical body, and a bottom located at the lower end of the cylindrical body, wherein the top and the bottom are detachably connected to the cylindrical body.

[0012] Preferably, the compression plate and the dispersion plate are circular plates, and the edges of the circular plates are in contact with the inner wall of the cylinder.

[0013] Preferably, the separator further includes a support frame for supporting the housing on a fixed surface.

[0014] Preferably, the inlet of the separator is connected to the pressure gauge tee via a first flexible hose, the diameter of which is not greater than the diameter of the compression through hole.

[0015] Preferably, the outlet of the separator is connected to one end of the control tube of the controller via a second hose.

[0016] Preferably, the other end of the control tube is connected to the production pipeline, and the control tube is also equipped with a pressure gauge located downstream of the control valve.

[0017] Compared with the prior art, this utility model has the following advantages: The heavy oil dilution electric pump well pressure relief device of this utility model, through a separator, can perform pressure relief during normal production, i.e., during the injection of thin oil. After the mixture of gas and thin oil in the oil well enters the separator, the separation mechanism allows the gas in the oil well to pass through, leaving the thin oil in the casing until the pressure measured by the thermo-pressure gauge drops to the set value, thereby achieving pressure relief during the production process. After the pressure relief stops, the control valve is in the closed state. At this time, the pressure in the casing gradually rises. After the gas in the oil well enters the separator, it passes through the separation mechanism and the thin oil located in the casing, accumulating in the upper part of the casing. As the pressure in the casing increases, the pressure in the upper part of the casing gradually increases, and the pressure gradually forces the thin oil out of the casing and back into the casing, thereby completing the automatic return of the thin oil and preventing the separator from being blocked by thin oil. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a heavy oil dilution electric pump well pressure relief device according to an embodiment of the present invention.

[0019] Figure 2 This is an enlarged structural schematic diagram of the separator in a heavy oil dilution electric pump well pressure relief device according to an embodiment of the present invention.

[0020] Figure Labels

[0021] 1. Pressure gauge tee.

[0022] 2 Separator, 21 Housing, 22 Separation Mechanism, 221 Compression Plate, 2211 Compression Through Hole, 222 Dispersion Plate, 2221 Dispersion Through Hole, 223 Support Rod, 23 Support Frame, 231 Support Leg, 232 Support Feet;

[0023] 3 controller, 31 control tube, 32 control valve, 33 integrated temperature and pressure gauge, 34 pressure gauge;

[0024] 4. First hose;

[0025] 5. Second hose. Detailed Implementation

[0026] This utility model provides a device for venting casing pressure in a heavy oil dilution electric pump well, such as... Figure 1 As shown, the casing pressure relief device includes: a pressure gauge tee 1, a separator 2, and a controller 3. The pressure gauge tee 1 is connected to the casing pressure gauge cock. When the pressure inside the casing is too high, the mixture of gas and thin oil produced in the well inside the casing will enter the separator 2 through the pressure gauge tee 1. The separator 2 is used to separate the thin oil and gas. The separator 2 has a housing 21 and a separation mechanism 22 located inside the housing 21. The housing 21 has an inlet and an outlet, and the inlet is connected to the pressure gauge tee 1. The controller 3 includes a control pipe 31 connected to the outlet of the separator 2, a control valve 32 located on the control pipe 31, and a temperature and / or pressure test gauge. In this embodiment, a temperature and pressure integrated gauge 33 is used. The temperature and pressure integrated gauge 33 is located upstream of the control valve 32. The control valve 32 opens or closes according to the value of the temperature and pressure integrated gauge 33.

[0027] This utility model's heavy oil dilution electric pump well pressure relief device, through separator 2, can perform pressure relief during normal production, i.e., during the injection of thin oil. After the mixture of gas and thin oil in the oil well enters separator 2, separation mechanism 22 allows the gas to pass through while retaining the thin oil in casing 21 until the pressure measured by thermo-barometer 33 drops to a set value, thus achieving pressure relief during production. After pressure relief stops, control valve 32 is closed. At this time, the pressure in the casing gradually rises. Gas from the oil well enters separator 2, passes through the separation mechanism and the thin oil located in casing 21, accumulating in the upper part of casing 21. As the pressure in the casing increases, the pressure in the upper part of casing 21 gradually increases, gradually forcing the thin oil out of casing 21 and back into the casing, thus completing the automatic return of the thin oil and preventing separator 2 from being blocked by thin oil.

[0028] The controller 3 allows setting pressure and temperature ranges, such as a pressure range of 3-5 MPa and a temperature range of 5-15°C. When the pressure drops below the set value of 3 MPa, the casing automatically closes to stop pressure relief; when the pressure exceeds the set value of 5 MPa, pressure relief begins. Additionally, when the temperature of the fluid discharged from the casing exceeds 15°C, pressure relief automatically stops; when the temperature drops to 5°C, pressure relief begins. The thin oil injected into the well is heated, so its temperature is higher than the temperature of the gas produced in the well. Therefore, when the temperature of the fluid discharged from the casing exceeds the set high temperature, it indicates that thin oil has entered the control pipe 31, and pressure relief stops. The thin oil will then return to the well under the pressure of the gas produced in the well. When the temperature drops to the set low temperature, it indicates that the thin oil has returned to the well, and pressure relief can be initiated.

[0029] The structure, principle, temperature and pressure settings, and priority of temperature and pressure control of the controller 3 itself are all existing technical means.

[0030] like Figure 2 As shown, the inlet is located at the bottom of the housing 21, and the outlet is located at the top of the housing 21. The separator 2 includes multiple layers of vertically arranged separation mechanisms 22. The multiple layers of vertically arranged separation mechanisms 22 can perform multi-stage separation of the mixture of light oil entering the housing 21 and gas produced in the oil well. Each separation mechanism 22 includes a compression plate 221, a dispersion plate 222 located above the compression plate 221, and a mist-catching net (not shown in the figure) located between the compression plate 221 and the dispersion plate 222. The mist-catching net has an existing structure and can be a porous structure. The mist-catching net is placed between the compression plate 221 and the dispersion plate 222, preferably filling the space between the compression plate 221 and the dispersion plate 222, but does not need to be fixedly connected to the compression plate 221 and / or the dispersion plate 222. The compression plate 221 has a compression through hole 2211 in the middle, and the edge of the dispersion plate 222 is provided with multiple dispersion through holes 2221. The total flow area of ​​all the dispersion through holes 2221 of a dispersion plate 222 is greater than the flow area of ​​a compression through hole 2211. The mixture of thin oil and gas produced in the oil well is compressed when it passes through the compression through hole 2211 of the compression plate 221. After passing through the compression plate 221, the volume increases rapidly, and the mixture of thin oil and gas produced in the oil well is dispersed. This facilitates the gas produced in the oil well to float upward from the mixture and continue to move upward through the mist trap and the dispersion through hole 2221 of the dispersion plate 222. Meanwhile, some of the thin oil is trapped under the compression plate 221 by the mist trap. After this multi-stage separation, the thin oil remains in the separator 2, and the gas produced in the oil well enters the controller 3.

[0031] like Figure 2As shown, adjacent compression plates 221 and dispersion plates 222 are supported by support rods 223. The support rods 223 are fixed to either the compression plate 221 or the dispersion plate 222, meaning the support rods 223 are integrated into a single compression plate 221 or a single dispersion plate 222. The space created by the support rods 223 between the compression plate 221 and the dispersion plate 222 prevents the mist-catching net from being compressed, allowing it to remain fluffy and retain more thin oil, thus facilitating gas production in the well. Furthermore, the compression plate 221 and the dispersion plate 222 are not fixed together. When cleaning is required, the compression plate 221, dispersion plate 222, and mist-catching net can be removed individually for cleaning, preventing the inconvenience of cleaning when they are fixed together.

[0032] like Figure 2 As shown, the housing 21 of the separator 2 includes a cylindrical body, a top located at the upper end of the cylindrical body, and a bottom located at the lower end of the cylindrical body. The top and the bottom are detachably connected to the cylindrical body, thereby making it easy to remove the compression plate 221, the dispersion plate 222, and the mist-collecting screen. The compression plate 221 and the dispersion plate 222 are circular plates, and the edges of the circular plates are in contact with the inner wall of the cylinder.

[0033] The separator 2 further includes a support frame 23 for supporting the housing 21 on a fixed surface. In this embodiment, the support frame 23 has three support legs 231, and each support leg 231 has a support foot 232 at its lower end.

[0034] In this embodiment, the inlet of the separator 2 is connected to the pressure gauge tee 1 via a first flexible hose 4, the diameter of which is no larger than the diameter of the compression through-hole 2211. When the mixture of light oil and gas produced in the oil well enters the first flexible hose 4, it is compressed and expands in volume upon entering the separator 2, thus facilitating the escape of gas from the mixture. In this embodiment, the outlet of the separator 2 is connected to one end of the control pipe 31 of the controller 3 via a second flexible hose 5.

[0035] The other end of the control pipe 31 is connected to the production pipeline, and the control pipe 31 is also equipped with a pressure gauge 34 located downstream of the control valve 32. The pressure gauge 34 can test the pressure of the production pipeline. During the production process, the pressure measured by the pressure relief device of the heavy oil dilution electric pump well of this utility model, i.e., the pressure measured by the integrated temperature and pressure gauge 33, needs to be kept higher than the pressure of the pressure gauge 34.

[0036] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art within the spirit and scope of this utility model also fall within the scope of protection of this utility model.

Claims

1. A pressure relief device for a heavy oil dilution electric pump well, characterized in that, include: The pressure gauge tee is connected to the pressure gauge cock; A separator for separating light oil and gas, the separator having a housing and a separation mechanism located within the housing, the housing having an inlet and an outlet, the inlet being connected to the pressure gauge tee; The controller includes a control pipe communicating with the outlet of the separator, a control valve disposed on the control pipe, and a temperature and / or pressure gauge located upstream of the control valve, the control valve opening or closing according to the value of the test gauge.

2. The heavy oil dilution electric pump well pressure relief device according to claim 1, characterized in that, The inlet is located at the bottom of the housing, the outlet is located at the top of the housing, and the separator includes multiple layers of separation mechanisms arranged vertically.

3. The heavy oil dilution electric pump well pressure relief device according to claim 2, characterized in that, Each separation mechanism includes a compression plate, a dispersion plate located above the compression plate, and a mist-catching net located between the compression plate and the dispersion plate. The compression plate has a compression through hole in the middle, and the dispersion plate has multiple dispersion through holes on its edge. The total flow area of ​​all dispersion through holes in a dispersion plate is greater than the flow area of ​​a compression through hole.

4. The heavy oil dilution electric pump well pressure relief device according to claim 3, characterized in that, Adjacent compression plates and dispersion plates are supported by support rods, which are fixed to the compression plates or dispersion plates.

5. The heavy oil dilution electric pump well pressure relief device according to claim 3, characterized in that, The separator housing includes a cylindrical body, a top located at the upper end of the cylindrical body, and a bottom located at the lower end of the cylindrical body, wherein the top and the bottom are detachably connected to the cylindrical body.

6. The heavy oil dilution electric pump well pressure relief device according to claim 5, characterized in that, The compression plate and the dispersion plate are circular plates, and the edges of the circular plates are in contact with the inner wall of the cylinder.

7. The heavy oil dilution electric pump well pressure relief device according to claim 1, characterized in that, The separator also includes a support frame for supporting the housing on a fixed surface.

8. The heavy oil dilution electric pump well pressure relief device according to claim 3, characterized in that, The inlet of the separator is connected to the pressure gauge tee via a first flexible hose, the diameter of which is not greater than the diameter of the compression through hole.

9. The heavy oil dilution electric pump well pressure relief device according to claim 8, characterized in that, The outlet of the separator is connected to one end of the control tube of the controller via a second hose.

10. The heavy oil dilution electric pump well pressure relief device according to claim 9, characterized in that, The other end of the control tube is connected to the production pipeline, and the control tube is also equipped with a pressure gauge located downstream of the control valve.

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