CN217233468U - Natural gas well fluid separator - Google Patents

Abstract

The application relates to the technical field of natural gas exploitation, and discloses a natural gas well fluid separator which comprises a mandrel, a plugging column and a circumferential sealing mechanism. The axial both ends of dabber are seted up respectively and are linked together external upper circulation mouth and lower circulation mouth, have seted up in the dabber along its axial extension's upper fluid passageway and lower fluid passageway, upper fluid passageway and lower fluid passageway intercommunication each other, and the internal diameter of upper fluid passageway is less than the internal diameter of lower fluid passageway. A plugging column is axially movably disposed within the lower fluid passage and is configured for reciprocal movement between a plugging position and an open position. A circumferential sealing mechanism is disposed about the mandrel. The occluding post is configured to block communication between the upper fluid passage and the lower fluid passage when in the occluding position and to communicate with each other when out of the occluding position. The application provides a natural gas well fluid separator, when guaranteeing lifting efficiency, can be more easy down.

Description

Natural gas well fluid separator

Technical Field

The application relates to the technical field of natural gas exploitation, in particular to a natural gas well fluid separator.

Background

During the exploitation of a natural gas well, bottom hole liquid accumulation is an important factor influencing the yield of the natural gas well. To increase the production of a gas well, it is necessary to remove bottom hole fluid from the gas well.

Ram (also known as a flow divider) drainage and production is a drainage and gas production technique. The plunger comprises a plurality of sealing gaskets which are contacted with the inner wall of the well under the action of the elastic element to form sealing. In the shut-in state, the plunger descends to the bottom of the well. When the well is opened, the thrust generated by the fluid below the plunger drives the plunger to move upwards, so that the accumulated liquid above the plunger is lifted upwards and is discharged through a well mouth. The plunger has a problem that the plunger may not descend when the well is shut in under the combined action of fluid resistance and the friction force of the sealing gasket and the inner wall of the well. Some solutions attempt to provide a flow channel on the plunger, which is through from top to bottom, so as to reduce the fluid resistance of the plunger when the plunger moves downward, and make the plunger move downward more easily. However, the up-and-down through flow channel causes the leakage of the plunger piston during the upward movement to be greatly increased, and the lifting efficiency of the accumulated liquid at the bottom of the well is reduced. In some cases, it may also result in the plunger not being able to return to the wellhead, presenting a safety hazard.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present application provide a natural gas well fluid separator that can successfully descend in a shut-in state while providing higher lift efficiency in an ascending state.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

a natural gas well fluid separator comprising:

the mandrel is provided with an upper flow port and a lower flow port which are communicated with the outside at two axial ends respectively, an upper fluid channel and a lower fluid channel which extend along the axial direction of the mandrel are sequentially arranged in the mandrel along the direction from the upper flow port to the lower flow port, the upper fluid channel and the lower fluid channel are communicated with each other, the inner diameter of the upper fluid channel is smaller than that of the lower fluid channel, the upper flow port is communicated with the upper fluid channel, and the lower flow port is communicated with the lower fluid channel;

a plugging post axially movably disposed within the lower fluid passageway and configured to reciprocate between a plugging position and an open position; and

a circumferential sealing mechanism disposed about the mandrel;

wherein the stem is configured to block communication between the upper and lower fluid passageways when in the blocking position and to communicate with each other when out of the blocking position.

Furthermore, a plurality of annular bulges are arranged at intervals along the outer peripheral surface of the axial plugging column.

Further, along the direction from the lower fluid channel to the upper fluid channel, the outer diameter of one end of the plugging column close to the upper fluid channel is gradually reduced.

Furthermore, the device also comprises a positioning column fixedly arranged in the lower fluid channel; a positioning hole is formed in the plugging column along the axial direction of the plugging column; the positioning column is inserted into the positioning hole, and the positioning column and the plugging column can be matched in a relatively sliding mode.

Furthermore, an outer positioning bulge protruding outwards in the radial direction is arranged at the position, located in the positioning hole, of the positioning column; the inner wall of the positioning hole is provided with an inner positioning bulge which is radially and inwards projected; the outer positioning projection is positioned between the inner positioning projection and the upper fluid channel;

the natural gas well fluid separator also comprises a positioning spring, the positioning spring is sleeved on the positioning column, and two ends of the positioning spring respectively abut against the inner positioning bulge and the outer positioning bulge; the positioning spring is always in a compressed state, so that the blocking column always has the trend of moving to the opening position.

Further, the axial position of the positioning column in the lower fluid channel is adjustable.

Furthermore, the device also comprises a fixed outer ring, a fixed inner ring and a connecting sheet; the fixed outer ring is fixedly arranged in the lower fluid channel; the fixed inner ring is arranged in the fixed outer ring and is connected with the fixed outer ring through a connecting sheet; the positioning column penetrates through the fixed inner ring and is in threaded fit with the fixed inner ring.

Furthermore, one end of the positioning column, which is far away from the upper fluid channel, is connected with a locking nut.

Further, the circumferential sealing mechanism comprises a sealing gasket and an elastic resetting piece;

a plurality of sealing gaskets disposed about the mandrel and configured to reciprocate radially;

the elastic restoring member acts on the sealing gasket and is configured to exert a radially outward elastic force on the sealing gasket.

Further, the elastic reset piece is a spring.

The technical scheme of the application has following advantage and beneficial effect at least:

when the natural gas well fluid separator provided by the embodiment of the application is operated in a natural gas well shaft, the upper fluid channel is positioned above the lower fluid channel. Under the condition of no external force, the blocking column is located at the open position under the action of self gravity, the upper fluid channel and the lower fluid channel are communicated with each other at the moment, and fluid below the natural gas well fluid separator can flow to the upper part of the natural gas well fluid separator through the lower fluid port, the lower fluid channel, the upper fluid channel and the upper fluid port in sequence. The gas well is shut in and the plugging string is maintained in the open position or somewhere between the open and plugged positions by its own weight as the gas well fluid separator descends in the gas well. In this manner, fluid below the gas well flow divider can readily flow above the gas well flow divider, so that the gas well flow divider experiences less resistance to downward movement and the gas well flow divider can more readily move downward. The natural gas well is opened, the thrust generated by the fluid below the natural gas well fluid separator drives the natural gas well fluid separator to move upwards, at the moment, the blocking column overcomes the self gravity to move to the blocking position under the pushing of the fluid, the communication between the upper fluid channel and the lower fluid channel is blocked, the accumulated liquid above the natural gas well fluid separator is difficult to leak below the natural gas well fluid separator, and the lifting efficiency is guaranteed. The natural gas well fluid separator provided by the embodiment of the application can go down more easily while the lifting efficiency is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below. It is appreciated that the following drawings depict only certain embodiments of the application and are not to be considered limiting of its scope. From these figures, other figures can be derived by those skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of an external configuration of a natural gas well fluid separator provided in an embodiment of the present application.

FIG. 2 is a schematic cross-sectional view of a natural gas well fluid separator according to an embodiment of the present application, with the plugging string in an open position.

Fig. 3 is a schematic cross-sectional view of a natural gas well fluid separator according to an embodiment of the present application, with a plugging string in a plugging position.

Fig. 4 is an enlarged view of fig. 2 at a.

Fig. 5 is a schematic connection diagram of a fixed outer ring, a fixed inner ring and a connecting sheet in a natural gas well fluid separator provided by an embodiment of the application.

In the figure: 010-natural gas well fluid separator; 100-mandrel; 101-an upstream port; 102-a down-flow port; 110 — an upper fluid channel; 120-lower fluid channel; 130-fishing head; 200-plugging the column; 210-an annular projection; 220-positioning holes; 221-inner positioning protrusion; 310-a sealing gasket; 320-an elastic reset piece; 410-positioning columns; 411-outer positioning protrusion; 500-positioning a spring; 610-a fixed outer ring; 620-fixed inner ring; 630-connecting pieces; 640-locking nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in detail and completely with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments.

Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of some embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that, in the embodiments and the features and technical solutions in the embodiments of the present application may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, orientations or positional relationships conventionally placed when the utility model is used, or orientations or positional relationships conventionally understood by those skilled in the art, and such terms are only used for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, a "natural gas well" may be a natural gas well for collecting conventional natural gas, and may also be a natural gas well for collecting unconventional natural gas (shale gas, coal bed gas, etc.).

Example 1:

fig. 1 is a schematic diagram of an external structure of a gas well fluid separator 010 according to the present embodiment. Fig. 2 is a schematic cross-sectional view of a gas well fluid separator 010 in accordance with this embodiment, with a plugging string 200 in an open position. Fig. 3 is a schematic cross-sectional view of a gas well fluid separator 010 in accordance with this embodiment, with a plugging string 200 in a plugging position. Fig. 4 is an enlarged view of fig. 2 at a.

Referring to fig. 1-4 in combination, the present embodiment provides a gas well fluid separator 010 that includes a mandrel 100, a plugging string 200, and a circumferential sealing mechanism.

The axial two ends of the mandrel 100 are respectively provided with an upper flow port 101 and a lower flow port 102 which are communicated with the outside, and an upper fluid channel 110 and a lower fluid channel 120 which extend along the axial direction of the mandrel 100 are sequentially arranged in the direction from the upper flow port 101 to the lower flow port 102. The upper fluid passage 110 and the lower fluid passage 120 are coaxial, the upper fluid passage 110 and the lower fluid passage 120 communicate with each other, and the inner diameter of the upper fluid passage 110 is smaller than that of the lower fluid passage 120. The upper fluid port 101 communicates with an end of the upper fluid passage 110 remote from the lower fluid passage 120. The lower fluid port 102 communicates with an end of the lower fluid passage 120 remote from the upper fluid passage 110.

The fishing head 130 is connected to the upper end (the end provided with the upper flow port 101) of the mandrel 100.

A circumferential sealing mechanism is disposed about the mandrel 100. The circumferential seal may be a fishbone seal or a shim seal. In this embodiment, the circumferential sealing mechanism is a gasket-type sealing mechanism, and includes a sealing gasket 310 and an elastic restoring member 320. A plurality of sealing gaskets 310 are disposed about the mandrel 100 and are configured to reciprocate radially. The elastic restoring member 320 acts on the sealing gasket 310 and is configured to apply an elastic force radially outward to the sealing gasket 310. Specifically, in the embodiment, the elastic restoring member 320 is a spring, and the elastic restoring member 320 is disposed between the sealing gasket 310 and the mandrel 100. The sealing gasket 310 is contacted with the inner wall of the well of the natural gas well through the action of the elastic resetting piece 320 to form sealing.

The blocking post 200 is axially movably disposed within the lower fluid passageway 120 and is configured to reciprocate between a blocking position (shown in fig. 3) and an open position (shown in fig. 2), the blocking post 200 blocking communication between the upper fluid passageway 110 and the lower fluid passageway 120 when the blocking post 200 is in the blocking position. When the occluding post 200 is removed from the occluding position, the upper fluid passage 110 and the lower fluid passage 120 are in communication with each other.

The upper fluid passageway 110 is located above the lower fluid passageway 120 when the gas well fluid separator 010 is operating in a gas well. In the absence of an external force, the plugging column 200 is in the open position under its own weight, with the upper flow channel 110 and the lower flow channel 120 in communication with each other, and fluid below the gas well fluid separator 010 can flow through the lower flow port 102, the lower flow channel 120, the upper flow channel 110 and the upper flow port 101 in that order, to above the gas well fluid separator 010. The gas well is shut in and the plugging string 200 can be maintained in the open position or somewhere between the open and plugged positions by its own weight as the gas well fluid separator 010 descends in the gas well wellbore. In this manner, fluid below the gas well fluid separator 010 can easily flow over the gas well fluid separator 010, so that the gas well fluid separator 010 experiences less resistance to downward movement and the gas well fluid separator 010 can more easily move downward. When the natural gas well is opened, the thrust generated by the fluid below the natural gas well fluid separator 010 drives the natural gas well fluid separator 010 to move upwards, at the moment, the plugging column 200 moves to the plugging position by overcoming the self gravity under the thrust of the fluid, the communication between the upper fluid channel 110 and the lower fluid channel 120 is blocked, the accumulated fluid above the natural gas well fluid separator 010 is difficult to leak below the natural gas well fluid separator 010, and the lifting efficiency is ensured. The natural gas well fluid separator 010 provided by the embodiment can go down more easily while the lifting efficiency is ensured.

Further, in the present embodiment, a plurality of annular protrusions 210 are provided at intervals along the outer circumferential surface of the axial packing column 200. The provision of a plurality of annular projections 210 provides a greater area of contact between the plug string 200 and the fluid, ensuring that the plug string 200 is given sufficient thrust to remain in the plugged position as the gas well fluid separator 010 is run.

Further, in the present embodiment, the outer diameter of the end of the plugging column 200 close to the upper fluid channel 110 is gradually reduced along the direction from the lower fluid channel 120 to the upper fluid channel 110. In this manner, the blocking post 200 can be more easily inserted into the lower end of the upper fluid pathway 110, and the outer circumferential surface of the upper end of the blocking post 200 is in contact with the inner surface of the lower end of the upper fluid pathway 110 to block the communication between the upper fluid pathway 110 and the lower fluid pathway 120.

Further, in this embodiment, the gas well fluid separator 010 further includes a positioning post 410 fixedly disposed within the lower fluid passage 120; the plugging column 200 is provided with a positioning hole 220 along the axial direction; the positioning post 410 is inserted into the positioning hole 220, and the positioning post 410 is slidably engaged with the plugging post 200.

The positioning post 410 can limit the radial movement of the plugging column 200, so that the plugging column 200 cannot be inserted into the lower end of the upper fluid channel 110 due to excessive radial displacement is avoided, and the working reliability of the gas well fluid separator 010 is improved.

Further, the positioning column 410 is provided with an outer positioning protrusion 411 protruding radially outward at a position located in the positioning hole 220; the inner wall of the positioning hole 220 is provided with an inner positioning protrusion 221 protruding radially inwards; the outer positioning protrusion 411 is positioned between the inner positioning protrusion 221 and the upper fluid channel 110. The gas well fluid separator 010 further includes a positioning spring 500, the positioning spring 500 is sleeved on the positioning column 410, and two ends of the positioning spring 500 respectively abut against the inner positioning protrusion 221 and the outer positioning protrusion 411. The positioning spring 500 is always in a compressed state so that the plugging column 200 always has a tendency to move to the open position.

Due to the elastic force which is applied to the plugging column 200 by the positioning spring 500 and points to the open position, the natural gas well fluid separator 010 is not easy to move to the plugging position under the action of fluid resistance when the shut-in well descends, the natural gas well fluid separator 010 can descend quickly, and the working reliability of the natural gas well fluid separator 010 is improved.

Further, the axial position of locating post 410 within lower fluid passageway 120 is adjustable.

By adjusting the axial position of the positioning post 410 within the lower fluid passage 120, the distance between the outer positioning protrusion 411 and the inner positioning protrusion 221 can be adjusted, thereby adjusting the amount of compression of the positioning spring 500. The smaller the distance between the outer positioning protrusion 411 and the inner positioning protrusion 221 is, the larger the compression amount of the positioning spring 500 is, the larger the elastic force applied to the plugging column 200 is, and the less easily the plugging column 200 moves to the plugging position. Conversely, the easier the plugging column 200 moves to the plugging position. By adjusting the axial position of locating post 410 within lower fluid passageway 120, gas well fluid separator 010 is able to be adapted for use with a variety of different conditions of the gas well.

Further, the gas well fluid separator 010 further includes a fixed outer ring 610, a fixed inner ring 620, and a connecting piece 630. Referring to fig. 5, fig. 5 is a schematic diagram illustrating the connection of the fixed outer ring 610, the fixed inner ring 620 and the connecting piece 630 in the gas well fluid separator 010 according to this embodiment. Fixed outer ring 610 is fixedly disposed within lower fluid passage 120. Specifically, the outer circumferential surface of the fixed outer ring 610 is screwed with the inner circumferential surface of the lower fluid passage 120. The fixed inner ring 620 is disposed within the fixed outer ring 610, the fixed outer ring 610 is coaxial with the fixed inner ring 620, and the fixed outer ring 610 and the fixed inner ring 620 have a gap for fluid to pass through. The fixed outer ring 610 and the fixed inner ring 620 are connected by a connecting piece 630. Positioning post 410 extends through inner stationary ring 620 and is threadably engaged with inner stationary ring 620. By rotating locating post 410, the axial position of locating post 410 within lower fluid passageway 120 may be adjusted.

Further, a retaining nut 640 is threadably coupled to an end of the positioning post 410 distal from the upper fluid passage 110. The locking nut 640 is rotated to be tightly attached to the inner fixed ring 620, so that uncontrolled rotation of the positioning column 410 is avoided, and the working reliability of the gas well fluid separator 010 is improved.

In summary, the gas well fluid separator 010 provided by the present application can more easily move downward while ensuring the lifting efficiency.

The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A natural gas well fluid separator, comprising:

the mandrel is provided with an upper flow port and a lower flow port which are communicated with the outside at two axial ends of the mandrel respectively, an upper fluid channel and a lower fluid channel which extend along the axial direction of the mandrel are sequentially arranged in the mandrel along the direction from the upper flow port to the lower flow port, the upper fluid channel and the lower fluid channel are communicated with each other, the inner diameter of the upper fluid channel is smaller than that of the lower fluid channel, the upper flow port is communicated with the upper fluid channel, and the lower flow port is communicated with the lower fluid channel;

a shutoff column axially movably disposed within the lower fluid passageway and configured for reciprocating movement between a shutoff position and an open position; and

a circumferential sealing mechanism disposed about the mandrel;

wherein the occluding post is configured to block communication between the upper fluid passage and the lower fluid passage when in the occluding position and to communicate with each other when out of the occluding position.

2. A natural gas well fluid separator as set forth in claim 1 wherein:

and a plurality of annular bulges are arranged on the outer peripheral surface of the plugging column at intervals along the axial direction.

3. A natural gas well fluid separator as set forth in claim 1 wherein:

the outer diameter of one end of the plugging column close to the upper fluid channel is gradually reduced along the direction from the lower fluid channel to the upper fluid channel.

4. A natural gas well fluid separator as set forth in claim 1 wherein:

the positioning column is fixedly arranged in the lower fluid channel; a positioning hole is formed in the plugging column along the axial direction of the plugging column; the positioning column is inserted into the positioning hole, and the positioning column is matched with the plugging column in a relatively sliding mode.

5. A natural gas well fluid separator as set forth in claim 4 wherein:

the part of the positioning column, which is positioned in the positioning hole, is provided with an outer positioning bulge which protrudes outwards in the radial direction; the inner wall of the positioning hole is provided with an inner positioning bulge which is radially and inwards projected; the outer locating projection is located between the inner locating projection and the upper fluid channel;

the natural gas well fluid separator also comprises a positioning spring, the positioning spring is sleeved on the positioning column, and two ends of the positioning spring respectively abut against the inner positioning bulge and the outer positioning bulge; the positioning spring is always in a compressed state, so that the plugging column always has a tendency of moving to the opening position.

6. A natural gas well fluid separator as set forth in claim 5 wherein:

the axial position of the positioning column in the lower fluid channel is adjustable.

7. A natural gas well fluid separator as set forth in claim 6 wherein:

the device also comprises a fixed outer ring, a fixed inner ring and a connecting sheet; the fixed outer ring is fixedly arranged in the lower fluid channel; the fixed inner ring is arranged in the fixed outer ring and is connected with the fixed outer ring through the connecting sheet; the positioning column penetrates through the fixed inner ring and is in threaded fit with the fixed inner ring.

8. A natural gas well fluid separator as set forth in claim 7 wherein:

and one end of the positioning column, which is far away from the upper fluid channel, is connected with a locking nut.

9. A natural gas well fluid separator as set forth in claim 1 wherein:

the circumferential sealing mechanism comprises a sealing gasket and an elastic resetting piece;

a plurality of said sealing gaskets disposed about said mandrel and configured to reciprocate radially;

the elastic restoring member acts on the sealing gasket and is configured to apply a radially outward elastic force to the sealing gasket.

10. A natural gas well fluid separator as set forth in claim 9 wherein:

the elastic reset piece is a spring.

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