CN216199320U - Oil gas well head falls back pressure device - Google Patents

Abstract

The application discloses oil gas well head falls back pressure device, it includes: the conveying unit is used for pressurizing the first power medium to form a second power medium; the jet pump comprises a liquid inlet, a suction inlet, a mixing chamber and a spray outlet, wherein the liquid inlet is connected with the conveying unit and is used for conveying the second power medium to the mixing chamber so as to enable the mixing chamber to be in a negative pressure state, the suction inlet is used for sucking a target medium in the oil-gas well into the mixing chamber, and the mixing chamber is used for mixing the second power medium and the target medium to form a mixed medium and discharging the mixed medium out of the jet pump through the spray outlet; and one end of the separation unit is connected with the jet outlet of the jet pump, and the other end of the separation unit is connected with the conveying unit, and the separation unit is used for separating the mixed medium to obtain a target medium and a first power medium and conveying the first power medium to the conveying unit.

Description

Oil gas well head falls back pressure device

Technical Field

The application relates to a back pressure device falls at oil gas well head belongs to oil gas well technical field.

Background

At present, along with the continuous improvement of the liquid production volume of the oil well, the viscosity of crude oil is increased, the flow resistance is increased, the pressure of the oil well mouth is also continuously increased, the oil well mouth back pressure enables the oil well output liquid to flow to the measurement room from the well mouth, but the over-high back pressure not only can influence the productivity of the oil well, but also can threaten the safety of equipment, thereby improving the investment of ground construction.

Currently, most oil fields employ screw pumps to reduce wellhead back pressure. Although the process is simple when the screw pump is used, the screw pump may have problems of serious abrasion, pump blockage and the like in the long-term use process due to the occurrence of solids such as sand production or scaling and the like in an oil well, and needs to be frequently replaced and maintained.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the application provides a back pressure reducing device for a wellhead of an oil and gas well, which can obviously reduce the back pressure at the wellhead, improve the yield of the oil well, save the use amount of power media, realize circular production and save the production cost; in addition, the maintenance is convenient, and different working environments and working requirements can be met.

According to an aspect of the present application, there is provided an oil and gas well wellhead back pressure lowering device, comprising:

the conveying unit is used for pressurizing the first power medium to form a second power medium;

the jet pump comprises a liquid inlet, a suction inlet, a mixing chamber and a spray outlet, wherein the liquid inlet is connected with the conveying unit and is used for conveying the second power medium to the mixing chamber so as to enable the mixing chamber to be in a negative pressure state, the suction inlet is used for sucking a target medium in an oil-gas well into the mixing chamber, and the mixing chamber is used for mixing the second power medium and the target medium to form a mixed medium and discharging the mixed medium out of the jet pump through the spray outlet;

and one end of the separation unit is connected with the jet outlet of the jet pump, and the other end of the separation unit is connected with the conveying unit, and the separation unit is used for separating the mixed medium to obtain a target medium and a first power medium and conveying the first power medium to the conveying unit.

Optionally, the separation unit comprises a separation tank, a buffer tank and an outlet valve, the outlet valve is connected with the separation tank and used for discharging oil gas in the target medium, and the buffer tank is respectively connected with the separation tank and the conveying unit and used for containing the first power medium.

Optionally, the separation unit further comprises a sand discharging device connected to the separation tank for discharging solid impurities in the target medium.

Optionally, the suction inlet comprises a first pipe section and a second pipe section which are connected, the second pipe section is located between the first pipe section and the mixing chamber, and the caliber of the first pipe section is larger than that of the second pipe section.

Optionally, the first pipe section and the second pipe section are connected by an arcuate transition section.

Optionally, the liquid inlet comprises a third pipe section, a fourth pipe section and a fifth pipe section which are connected in sequence, the fifth pipe section is positioned between the fourth pipe section and the mixing chamber,

the caliber of the third pipe section is larger than that of the fifth pipe section, and the calibers of the fourth pipe sections are sequentially reduced from the third pipe section to the fifth pipe section.

Optionally, the mixing chamber includes a throat and a diffuser connected to each other, the diffuser is located between the throat and the ejection port, and an aperture of the diffuser is larger than an aperture of the throat.

Optionally, the liquid inlet and the mixing chamber are arranged concentrically.

Optionally, the suction inlet is connected to the oil and gas well through a first pipeline, and a first valve is arranged on the first pipeline; and/or

The separation unit is connected with the conveying unit through a second pipeline, and a second valve is arranged on the second pipeline; and/or

The conveying unit is connected with the jet pump through a third pipeline, and a third valve is arranged on the third pipeline; and/or

The jet pump is connected with the separation unit through a fourth pipeline, and a fourth valve is arranged on the fourth pipeline.

Optionally, the delivery unit is a centrifugal pump.

Benefits that can be produced by the present application include, but are not limited to:

1. according to the oil-gas well wellhead back pressure lowering device, a conveying unit is arranged to pressurize a first power medium to form a second power medium, so that the second power medium passes through a jet pump at a high speed, air at an inlet is taken away due to the viscous action between the second power medium and the air, the pressure at the inlet connected with the wellhead of the jet pump is lowered, a vacuum area is generated, a target medium is sucked into a mixing chamber finally, momentum exchange is completed in the mixing chamber, the kinetic energy of the target medium is increased, and the formed mixed medium is discharged out of the jet pump through a discharge port and enters a separation unit; the separation unit can separate the mixed medium to obtain a first power medium, and the first power medium is continuously conveyed into the conveying unit for pressurization and recycling, so that the back pressure at the wellhead can be obviously reduced, the oil well yield is improved, the using amount of the first power medium can be saved, and the production cost is saved; in addition, the jet pump is simple to process and manufacture, low in risk, convenient to maintain, excellent in back pressure reducing effect, capable of adapting to different working environments and working requirements, strong in corrosion resistance and capable of reducing environmental pollution.

2. The application provides a back pressure device falls at oil gas well head discharges to the buffer tank in through setting up the separation tank after with the separation of water in the target medium, continues to carry to the conveying unit as first power medium to realized the cyclic utilization of first power medium, practiced thrift manufacturing cost greatly.

3. The application provides a back pressure device falls at oil gas well head through setting up out the sand device to discharge the solid-state impurity in the target medium, like grit etc. prevent that it from piling up in the knockout drum, guarantee the separation effect.

4. The application provides a back pressure device falls at oil gas well head, the bore through setting up first pipeline section is greater than the bore of second pipeline section, and the target medium gets into the second pipeline section after first pipeline section again to reduce the resistance when the target medium gets into the sunction inlet, the second pipeline section bore reduces, can improve the velocity of flow of target medium to a certain extent, makes it discharge from the jet pump smoothly. The first pipe section and the second pipe section are connected through the arc transition section, so that the flow resistance of the target medium is further reduced, and the target medium can smoothly enter the mixing chamber.

5. According to the oil-gas well wellhead back pressure reducing device, the caliber of the third pipe section is larger than that of the fifth pipe section, so that the momentum loss of a second power medium entering the third pipe section is reduced, the second power medium enters the mixing chamber at a high flow rate, the pressure of a suction inlet is ensured to be low, a target medium is sucked into the mixing chamber, and the wellhead back pressure is reduced; meanwhile, the flow velocity of the second power medium can be improved to a certain extent by the fifth pipe section; the caliber of the fourth pipe section is sequentially reduced from the third pipe section to the fifth pipe section, so that the buffer is provided for the advancing process of the second power medium.

6. According to the oil-gas well wellhead back pressure reducing device, the diffusion pipe is arranged between the throat pipe and the spraying port, so that a second power medium and a target medium are fully mixed in the throat pipe, and the kinetic energy of the second power medium is transferred to the target medium, so that the kinetic energy of the target medium is increased; meanwhile, the arrangement of the diffusion pipe enables the flow velocity of the mixed medium to be gradually reduced, and the residual kinetic energy is converted into static pressure and then lifted to the ground.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic view of a wellhead back pressure reducing device of an oil and gas well according to an embodiment of the application;

fig. 2 is a schematic cross-sectional view of a jet pump according to an embodiment of the present application.

List of parts and reference numerals:

1. a conveying unit; 2. a jet pump; 3. a liquid inlet; 4. a suction inlet; 5. a separation tank; 6. a buffer tank; 7. an outlet valve; 8. a sand discharge device; 9. a throat; 10. a diffuser tube; 11. a first valve; 12. a second valve; 13. a third valve; 14. a third valve.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The oil gas well wellhead back pressure reducing device can be suitable for oil gas wells of any types, does not limit the depth of the oil gas wells and the well body structure and other parameters, and is connected with an oil conveying pipeline when used for reducing the oil gas well wellhead back pressure.

As shown in fig. 1-2, the embodiment of this application discloses an oil and gas well wellhead back pressure device that falls, it includes: a conveying unit 1, a jet pump 2 and a separation unit. The conveying unit 1 is used for pressurizing a first power medium to form a second power medium; the jet pump 2 comprises a liquid inlet 3, a suction inlet 4, a mixing chamber and a spray outlet, wherein the liquid inlet 3 is connected with the conveying unit 1 and is used for conveying a second power medium to the mixing chamber so as to enable the mixing chamber to be in a negative pressure state, the suction inlet 4 is used for sucking a target medium in an oil-gas well into the mixing chamber, and the mixing chamber is used for mixing the second power medium and the target medium to form a mixed medium and discharging the mixed medium out of the jet pump 2 through the spray outlet; one end of the separation unit is connected with the ejection port of the jet pump 2, and the other end is connected with the conveying unit 1, and the separation unit is used for separating the mixed medium to obtain a target medium and a first power medium and conveying the first power medium to the conveying unit 1.

The conveying unit 1 is arranged to pressurize the first power medium to form a second power medium, so that the second power medium passes through the jet pump 2 at a high speed, air at the position of the suction inlet 4 is taken away due to the viscous action between the second power medium and the air, the pressure at the position of the suction inlet 4, connected with a wellhead, of the jet pump 2 is reduced, a vacuum area is generated, the target medium is sucked into the mixing chamber and momentum exchange is completed in the mixing chamber, so that the kinetic energy of the target medium is increased, the mixed medium is discharged out of the jet pump 2 through the discharge port and enters the separation unit; the separation unit can separate the mixed medium to obtain a first power medium, and the first power medium is continuously conveyed into the conveying unit 1 to be pressurized, so that the mixed medium is recycled, the back pressure at the wellhead can be obviously reduced, the oil well yield is improved, the using amount of the first power medium can be saved, and the production cost is saved; in addition, the jet pump 2 is simple to process and manufacture, low in risk, convenient to maintain, excellent in back pressure reducing effect, capable of adapting to different working environments and working requirements, strong in corrosion resistance and capable of reducing environmental pollution.

It is understood that the first motive medium and the second motive medium are the same in composition, and differ only in that the pressure of the second motive medium is higher than the pressure of the first motive medium, so that the flow rate of the second motive medium is higher than the flow rate of the first motive medium, thereby functioning as the motive medium of the jet pump 2. Specifically, the present embodiment does not limit the composition of the first motive medium, as long as the pressurized first motive medium can be used as the medium of the jet pump 2 through the conveying unit 1, and the first motive medium may be liquid or gas. Preferably, in the present embodiment, water is used as the first motive medium.

It is understood that the target medium is crude oil, oil and gas, water, sand, etc. in the oil and gas well.

Specifically, the present embodiment does not limit the type of the conveying unit 1, as long as the second motive medium is formed by pressurizing the first motive medium. Preferably, the delivery unit 1 is a centrifugal pump. The centrifugal pump can pump the first power medium in the separation unit and pressurize it as the power medium for the jet pump 2.

As an embodiment, the separation unit comprises a separation tank 5, a buffer tank 6 and an outlet valve 7, wherein the outlet valve 7 is connected with the separation tank 5 and used for discharging oil gas in the target medium, and the buffer tank 6 is respectively connected with the separation tank 5 and the conveying unit 1 and used for containing the first power medium. Discharge to buffer tank 6 in through setting up knockout drum 5 with the water separation in the target medium in, continue to carry to conveying unit 1 as first power medium to realize the cyclic utilization of first power medium, practiced thrift manufacturing cost greatly.

As an embodiment, the separation unit further comprises a sand outlet device 8, and the sand outlet device 8 is connected with the separation tank 5 and used for discharging solid impurities in the target medium. Through setting up sand discharging device 8 to discharge the solid-state impurity in the target medium, like grit etc. prevents it and piles up in knockout drum 5, guarantees the separation effect.

In one embodiment, the suction inlet 4 comprises a first pipe section and a second pipe section connected to each other, the second pipe section being located between the first pipe section and the mixing chamber, the first pipe section having a larger diameter than the second pipe section. Through setting up the bore that the bore of first pipeline section is greater than the bore of second pipeline section, the target medium gets into the second pipeline section after first pipeline section to reduce the resistance when the target medium gets into suction inlet 4, the bore of second pipeline section reduces, can improve the velocity of flow of target medium to a certain extent, makes it discharge from jet pump 2 smoothly.

In one embodiment, the first pipe section and the second pipe section are connected by an arcuate transition section. The first pipe section and the second pipe section are connected through the arc transition section, so that the flow resistance of the target medium is further reduced, and the target medium can smoothly enter the mixing chamber.

As an implementation mode, the liquid inlet 3 comprises a third pipe section, a fourth pipe section and a fifth pipe section which are connected in sequence, the fifth pipe section is positioned between the fourth pipe section and the mixing chamber, the caliber of the third pipe section is larger than that of the fifth pipe section, and the caliber of the fourth pipe section is reduced in sequence from the third pipe section to the fifth pipe section. By setting the caliber of the third pipe section to be larger than that of the fifth pipe section, the momentum loss of the second power medium entering the third pipe section is reduced, so that the second power medium enters the mixing chamber at a higher flow rate, the pressure of the suction inlet 4 is ensured to be lower, the target medium is sucked into the mixing chamber, and the wellhead back pressure is reduced; meanwhile, the flow velocity of the second power medium can be improved to a certain extent by the fifth pipe section; the caliber of the fourth pipe section is sequentially reduced from the third pipe section to the fifth pipe section, so that the buffer is provided for the advancing process of the second power medium.

Specifically, the length of the third pipe section is greater than that of the fifth pipe section, so that the fifth pipe section is prevented from being too long and reducing the kinetic energy of the second power medium.

In one embodiment, the mixing chamber comprises a throat 9 and a diffuser 10 connected to each other, the diffuser 10 being located between the throat 9 and the outlet, the diffuser 10 having a larger diameter than the throat 9. By disposing the diffuser 10 between the throat 9 and the ejection port, the second motive power medium and the target medium are sufficiently mixed in the throat 9, and the kinetic energy of the second motive power medium is transmitted to the target medium, so that the kinetic energy of the target medium is increased; meanwhile, the arrangement of the diffusion pipe 10 gradually reduces the flow velocity of the mixed medium, converts the residual kinetic energy into static pressure, and then lifts to the ground.

As an embodiment, the loading port 3 and the mixing chamber are arranged concentrically. This setting mode can reduce the resistance when second power medium gets into the mixing chamber, reduces the kinetic energy loss, further guarantees to drop the back pressure effect, improves oil gas well output.

As an embodiment, the suction inlet 4 is connected with an oil and gas well through a first pipeline, and a first valve 11 is arranged on the first pipeline; the separation unit is connected with the conveying unit 1 through a second pipeline, and a second valve 12 is arranged on the second pipeline; the conveying unit 1 is connected with the jet pump 2 through a third pipeline, and a third valve 13 is arranged on the third pipeline; the jet pump 2 is connected to the separation unit via a fourth conduit, which is provided with a fourth valve 14. By arranging the first valve 11, the second valve 12, the third valve 13 and the fourth valve 14, the maintenance of the device or the response to the non-production state such as the shutdown of an emergency event and the like is facilitated.

Specifically, the present embodiment does not limit the types of the first valve 11, the second valve 12, the third valve 13, and the fourth valve 14, and may be gate valves, for example.

The working flow of the oil-gas well mouth pressure reducing and returning device is as follows: opening an outlet valve 7 and a first valve 11, adding a small amount of first power medium, namely initial water, into a buffer tank 6, then opening a second valve 12, a third valve 13 and a fourth valve 14, starting a conveying device, sucking the first power medium by the conveying device through a second pipeline, pressurizing, conveying to a jet pump 2 through a third pipeline, allowing a high-pressure and high-speed second power medium to flow into a liquid inlet 3 of the jet pump 2, allowing a suction inlet 4 to generate negative pressure, allowing a target medium in an oil-gas well to be sucked into a throat pipe 9 through the first valve 11, mixing with the second power medium to form a mixed medium, allowing the mixed medium to enter a separation unit through the fourth pipeline, separating the inflow target medium by the separation unit, discharging oil gas through the outlet valve 7, discharging solid impurities such as sand and stone to a sand discharging device 8, allowing water to flow into the buffer tank 6 to continue to serve as the first power medium, and realizing circular production, the well head back pressure of the oil-gas well is reduced, and the yield of the oil-gas well is improved.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. The utility model provides an oil gas well head falls back pressure device which characterized in that, it includes:

the conveying unit is used for pressurizing the first power medium to form a second power medium;

the jet pump comprises a liquid inlet, a suction inlet, a mixing chamber and a spray outlet, wherein the liquid inlet is connected with the conveying unit and is used for conveying the second power medium to the mixing chamber so as to enable the mixing chamber to be in a negative pressure state, the suction inlet is used for sucking a target medium in an oil-gas well into the mixing chamber, and the mixing chamber is used for mixing the second power medium and the target medium to form a mixed medium and discharging the mixed medium out of the jet pump through the spray outlet;

and one end of the separation unit is connected with the jet outlet of the jet pump, and the other end of the separation unit is connected with the conveying unit, and the separation unit is used for separating the mixed medium to obtain a target medium and a first power medium and conveying the first power medium to the conveying unit.

2. A wellhead back pressure lowering device according to claim 1, characterized in that the separation unit comprises a separation tank, a buffer tank and an outlet valve, the outlet valve is connected with the separation tank for discharging oil gas in the target medium, the buffer tank is respectively connected with the separation tank and the conveying unit for containing the first power medium.

3. An oil and gas well wellhead back pressure lowering device as claimed in claim 2, wherein the separation unit further comprises a sand production device connected with the separation tank for discharging solid impurities in the target medium.

4. An oil and gas well wellhead back pressure reducing device according to any one of claims 1 to 3, characterized in that the suction inlet comprises a first pipe section and a second pipe section which are connected, the second pipe section is positioned between the first pipe section and the mixing chamber, the caliber of the first pipe section is larger than that of the second pipe section.

5. An oil and gas well wellhead back pressure lowering device according to claim 4, wherein the first pipe section and the second pipe section are connected by an arc-shaped transition section.

6. An oil and gas well wellhead back pressure reducing device according to any one of claims 1 to 3, characterized in that the liquid inlet comprises a third pipe section, a fourth pipe section and a fifth pipe section which are connected in sequence, the fifth pipe section is positioned between the fourth pipe section and the mixing chamber,

the caliber of the third pipe section is larger than that of the fifth pipe section, and the calibers of the fourth pipe sections are sequentially reduced from the third pipe section to the fifth pipe section.

7. An oil and gas well wellhead back pressure reducing device according to any one of claims 1 to 3, characterized in that the mixing chamber comprises a throat and a diffuser connected, the diffuser is located between the throat and the ejection port, and the caliber of the diffuser is larger than that of the throat.

8. An oil and gas well wellhead back pressure reducing device according to any one of claims 1 to 3, characterized in that the liquid inlet and the mixing chamber are arranged with a common central axis.

9. A wellhead back pressure lowering device according to any of claims 1 to 3, characterized in that the suction inlet is connected to the oil and gas well by a first conduit, the first conduit being provided with a first valve; and/or

The separation unit is connected with the conveying unit through a second pipeline, and a second valve is arranged on the second pipeline; and/or

The conveying unit is connected with the jet pump through a third pipeline, and a third valve is arranged on the third pipeline; and/or

The jet pump is connected with the separation unit through a fourth pipeline, and a fourth valve is arranged on the fourth pipeline.

10. An oil and gas well wellhead back pressure reducing device as claimed in any one of claims 1 to 3, wherein the transfer unit is a centrifugal pump.

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