Anti-erosion cage sleeve type throttle valve core assembly

Abstract

The invention relates to the technical field of throttling pressure control devices in the oil and gas well testing process, in particular to an anti-erosion cage sleeve type throttling valve element assembly which comprises an inner cage sleeve, an outer cage sleeve, a sealing sleeve, an outer cage sleeve seat and an extension lining. The outer side of the upper portion of the inner cage sleeve is sleeved with an outer cage sleeve located in the outer cage sleeve seat, the inner wall of the outer cage sleeve is in sliding sealing contact with the outer wall of the inner cage sleeve, a first chamfer is arranged at the lower end of the outer cage sleeve and ranges from 40 degrees to 50 degrees, and an upper throttling hole set and a lower throttling hole set are formed in the inner cage sleeve corresponding to the position of the outer cage sleeve in an inside-outside penetrating mode. The throttling valve element assembly is reasonable in structure, through the upper throttling holes, the lower throttling holes and the first chamfers, high-speed fluid can collide and dissipate energy in the annular cavity formed between the outer wall of the inner cage sleeve and the inner wall of the valve cavity and the inner cage sleeve, so that erosion of the high-speed fluid to the inner cage sleeve is reduced, and the erosion resistance of the whole throttling valve element assembly is improved.

Description

Technical Field

[0001] The invention relates to the technical field of throttling pressure control devices in the process of oil and gas well testing, and is an erosion-resistant cage-type throttling valve core assembly. Background Art

[0002] During the production test of oil and gas fields, pressure control operations such as well killing, fluid replacement, and emergency sand discharge are often carried out. The throttle valve is one of the key devices for pressure control operations. There are many types of throttle valves, mainly including wedge throttle valves, needle throttle valves, cage throttle valves, etc. Among them, cage throttle valves are most widely used in high-pressure gas wells. High-pressure and high-speed fluid flows from the inlet of the cage throttle valve into the complex space inside the throttle valve. The fluid is then affected by the internal space of the throttle valve, causing the flow direction to change. The gas is compressed due to the high pressure and flows from the throttle hole on the cage to the center of the cage and then out from the outlet. However, there are solid particles in the high-pressure gas. These solid particles are also affected by the high-speed natural gas and have a very high speed, causing serious erosion consequences on the valve core. Summary of the invention

[0003] The present invention provides an erosion-resistant cage-type throttle valve core assembly, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of poor erosion resistance of the valve core of the prior throttle valve.

[0004] The technical scheme of the present invention is realized by the following measures: an anti-erosion cage sleeve type throttle valve core assembly, comprising an inner cage sleeve, an outer cage sleeve, a sealing sleeve, an outer cage sleeve seat and an extended bushing; an outer cage sleeve located in the outer cage sleeve seat is sleeved on the upper outer side of the inner cage sleeve, and the inner wall of the outer cage sleeve is in sliding sealing contact with the outer wall of the inner cage sleeve, a first chamfer is provided at the lower end of the outer cage sleeve, and the first chamfer is 40° to 50°, and two upper and lower chamfers are provided on the inner and outer sides of the inner cage sleeve corresponding to the position of the outer cage sleeve. A throttling hole group is provided, the upper throttling hole group includes two upper throttling holes arranged oppositely, the lower throttling hole group includes two lower throttling holes arranged oppositely, the aperture of the upper throttling hole is larger than the aperture of the lower throttling hole; a sealing sleeve is provided on the outer side of the lower part of the inner cage sleeve, and the inner wall of the sealing sleeve is in sealing contact with the outer wall of the inner cage sleeve, an extended bushing is provided on the lower side of the inner cage sleeve, the inner diameter of the inner cage sleeve is equal to the inner diameter of the extended bushing, and the lower end faces of the inner cage sleeve and the sealing sleeve are both seated on the upper end face of the extended bushing.

[0005] The following are further optimizations and / or improvements to the above invention: The aperture of the upper throttle hole may be 35 mm to 40 mm, and the aperture of the lower throttle hole may be 10 mm to 15 mm.

[0006] The aperture of the upper throttle hole can be 38 mm, and the aperture of the lower throttle hole can be 12 mm.

[0007] The central axis of the upper throttle hole may be parallel to the front-rear direction and intersect with the central axis of the inner cage sleeve, and the central axis of the lower throttle hole may be parallel to the left-right direction and intersect with the central axis of the inner cage sleeve.

[0008] The inner cage and the extension bushing may both be made of tungsten carbide alloy.

[0009] The lower end of the outer cage seat may be higher than the first chamfer, and the lower end of the outer cage seat is provided with a second chamfer, and the second chamfer is 40° to 50°.

[0010] The present invention has a reasonable structure. Through the upper throttling hole, the lower throttling hole and the first chamfer, the high-speed fluid can collide and dissipate energy in the annular cavity formed between the outer wall of the inner cage sleeve and the inner wall of the valve cavity and in the inner cage sleeve, thereby reducing the erosion of the inner cage sleeve by the high-speed fluid and improving the erosion resistance of the entire throttling valve core assembly. In addition, because the aperture of the upper throttling hole is larger than the aperture of the lower throttling hole, the purpose of precise throttling of small flow rates can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention.

[0012] Attached Figure 2 This is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention when installed and used.

[0013] The codes in the accompanying drawings are: 1 is the inner cage sleeve, 2 is the outer cage sleeve, 3 is the sealing sleeve, 4 is the outer cage sleeve seat, 5 is the extended bushing, 6 is the first chamfer, 7 is the upper throttle hole, 8 is the lower throttle hole, 9 is the second chamfer, 10 is the valve body, 11 is the valve cavity, 12 is the inlet channel, 13 is the outlet channel, and 14 is the valve stem. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0015] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0016] The present invention will be further described below in conjunction with embodiments and drawings: As attached Figure 1-2As shown, the erosion-resistant cage sleeve throttle valve core assembly comprises an inner cage sleeve 1, an outer cage sleeve 2, a sealing sleeve 3, an outer cage sleeve seat 4 and an extended bushing 5; the outer cage sleeve 2 located in the outer cage sleeve seat 4 is sleeved on the upper outer side of the inner cage sleeve 1, and the inner wall of the outer cage sleeve 2 is in sliding and sealing contact with the outer wall of the inner cage sleeve 1, and the lower end of the outer cage sleeve 2 is provided with a first chamfer 6, and the first chamfer 6 is 40° to 50°, and the inner cage sleeve 1 corresponding to the position of the outer cage sleeve 2 is provided with an upper and lower group of throttling holes inside and outside, and the upper group of throttling holes is provided. The flow hole group includes two upper throttle holes 7 which are arranged opposite to each other, and the lower throttle hole group includes two lower throttle holes 8 which are arranged opposite to each other. The aperture of the upper throttle hole 7 is larger than that of the lower throttle hole 8. A sealing sleeve 3 is provided on the outer side of the lower part of the inner cage sleeve 1, and the inner wall of the sealing sleeve 3 is in sealing contact with the outer wall of the inner cage sleeve 1. An extended bushing 5 is provided on the lower side of the inner cage sleeve 1. The inner diameter of the inner cage sleeve 1 is equal to the inner diameter of the extended bushing 5. The lower end faces of the inner cage sleeve 1 and the sealing sleeve 3 are both seated on the upper end face of the extended bushing 5.

[0017] When in use, the present application is installed in the valve body 10 of the throttle valve, a valve cavity 11 is provided in the valve body 10, a transverse inlet channel 12 connected to the valve cavity 11 is provided on the left side of the valve body 10, and a vertical outlet channel 13 connected to the valve cavity 11 is provided at the bottom of the valve body 10. When installed, the lower end surface of the extended bushing 5 sits on the bottom wall of the valve cavity 11, the lower end of the extended bushing 5 is connected to the upper end of the outlet channel, the outer wall of the sealing sleeve 3 is in sealing contact with the inner wall of the valve cavity 11, and the top of the outer cage seat 4 is equipped with a valve The central axis of the upper throttle hole 7 and the lower throttle hole 8 is at a certain angle to the central axis of the inlet channel 12, and the certain angle is greater than 15°; when the throttle valve is in a fully open state, the valve stem 14 drives the outer cage 2 to move upward relative to the inner cage 1, so that the upper throttle hole 7 and the lower throttle hole 8 are fully opened; and when the throttle valve needs to throttle, the valve stem 14 drives the outer cage 2 to move downward relative to the inner cage 1 to reduce the flow area of ​​the upper throttle hole 7 and the lower throttle hole 8, thereby achieving the purpose of throttling. Since the lower end of the outer cage 2 is provided with a first chamfer 6, and the central axes of the upper throttle hole 7 and the lower throttle hole 8 are at a certain angle to the central axis of the air inlet passage, the high-speed fluid entering from the inlet passage 12 will first collide and dissipate energy in the annular cavity formed between the outer wall of the inner cage 1 and the inner wall of the valve cavity 11, thereby reducing the erosion of the inner cage 1 by the high-speed fluid and improving the anti-erosion ability of the entire throttle valve core assembly. In addition, since the two upper throttle holes 7 are arranged relatively and the two lower throttle holes 8 are arranged relatively, the high-speed fluid will be discharged from the inlet passage 12. , so that the high-speed fluid entering the inner cage sleeve 1 through the two upper throttle holes 7 will collide and dissipate energy, and the high-speed fluid entering the inner cage sleeve 1 through the two lower throttle holes 8 will collide and dissipate energy, further reducing the erosion of the inner cage sleeve 1. By setting the extended bushing 5, the anti-erosion ability at the outlet is further improved. Moreover, by setting the aperture of the upper throttle hole 7 larger than the aperture of the lower throttle hole 8, the purpose of precise throttling of small flow is achieved. Specifically, in this embodiment, the first chamfer 6 is 45°.

[0018] The above embodiments may be further optimized and / or improved according to actual needs: Preferably, the aperture of the upper throttle hole 7 is 35 mm to 40 mm, and the aperture of the lower throttle hole 8 is 10 mm to 15 mm. Specifically, in this embodiment, the aperture of the upper throttle hole 7 is 38 mm, and the aperture of the lower throttle hole 8 is 12 mm.

[0019] Specifically, the central axis of the upper throttle hole 7 is parallel to the front-to-back direction and intersects with the central axis of the inner cage 1, and the central axis of the lower throttle hole 8 is parallel to the left-to-right direction and intersects with the central axis of the inner cage 1. Therefore, the upper throttle hole 7 is perpendicular to the lower throttle hole 8, and the central angle of the two is 90 degrees. When the present application is installed in the valve body 10, the angles between the central axes of the upper throttle hole 7 and the lower throttle hole 8 and the central axis of the inlet channel 12 are all 45 degrees, which is more conducive to the collision and energy dissipation of the high-speed fluid in the annular cavity formed between the outer wall of the inner cage 1 and the inner wall of the valve cavity 11.

[0020] The inner cage sleeve 1 and the extended bushing 5 are both made of tungsten carbide alloy, so that the inner cage sleeve 1 and the extended bushing 5 have high hardness and good impact toughness.

[0021] As attached Figure 1-2 As shown, the lower end of the outer cage seat 4 is higher than the first chamfer 6, and the lower end of the outer cage seat 4 is provided with a second chamfer 9, and the second chamfer 9 is 40° to 50°. By providing the second chamfer 9, it is more conducive to the collision and energy dissipation of the high-speed fluid in the annular cavity formed between the outer wall of the inner cage 1 and the inner wall of the valve cavity 11. Specifically, in this embodiment, the second chamfer 9 is 45°.

[0022] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An anti-erosion cage type throttle valve core assembly, characterized in that It comprises an inner cage sleeve, an outer cage sleeve, a sealing sleeve, an outer cage sleeve seat and an extended bushing; the upper outer side of the inner cage sleeve is provided with an outer cage sleeve located in the outer cage sleeve seat, and the inner wall of the outer cage sleeve is in sliding sealing contact with the outer wall of the inner cage sleeve, the lower end of the outer cage sleeve is provided with a first chamfer, the first chamfer is 40° to 50°, and the inner cage sleeve corresponding to the position of the outer cage sleeve is provided with an upper and lower group of throttling holes inside and outside, the upper group of throttling holes includes two upper throttling holes arranged oppositely, and the lower group of throttling holes includes two lower throttling holes arranged oppositely, and the aperture of the upper throttling hole is larger than the aperture of the lower throttling hole; the lower outer side of the inner cage sleeve is provided with a sealing sleeve, and the inner wall of the sealing sleeve is in sealing contact with the outer wall of the inner cage sleeve, the lower side of the inner cage sleeve is provided with an extended bushing, the inner diameter of the inner cage sleeve is equal to the inner diameter of the extended bushing, and the lower end faces of the inner cage sleeve and the sealing sleeve are both seated on the upper end face of the extended bushing.

2. The erosion-resistant cage-type throttle valve core assembly according to claim 1 is characterized in that The aperture of the upper throttle hole is 35mm to 40mm, and the aperture of the lower throttle hole is 10mm to 15mm.

3. The erosion-resistant cage-type throttle valve core assembly according to claim 2 is characterized in that The diameter of the upper throttle hole is 38mm, and the diameter of the lower throttle hole is 12mm.

4. The erosion-resistant cage-type throttle valve core assembly according to claim 1, 2 or 3, characterized in that The central axis of the upper throttle hole is parallel to the front-rear direction and intersects with the central axis of the inner cage sleeve, and the central axis of the lower throttle hole is parallel to the left-right direction and intersects with the central axis of the inner cage sleeve.

5. The erosion-resistant cage-type throttle valve core assembly according to claim 1, 2 or 3, characterized in that The inner cage and extension bushing are both made of tungsten carbide alloy.

6. The erosion-resistant cage-type throttle valve core assembly according to claim 4, characterized in that The inner cage and extension bushing are both made of tungsten carbide alloy.

7. The erosion-resistant cage-type throttle valve core assembly according to claim 1, 2, 3 or 6, characterized in that The lower end of the outer cage seat is higher than the first chamfer, and the lower end of the outer cage seat is provided with a second chamfer, and the second chamfer is 40° to 50°.

8. The erosion-resistant cage-type throttle valve core assembly according to claim 4, characterized in that The lower end of the outer cage seat is higher than the first chamfer, and the lower end of the outer cage seat is provided with a second chamfer, and the second chamfer is 40° to 50°.

9. The erosion-resistant cage-type throttle valve core assembly according to claim 5, characterized in that The lower end of the outer cage seat is higher than the first chamfer, and the lower end of the outer cage seat is provided with a second chamfer, and the second chamfer is 40° to 50°.

Images