Conversion type Christmas tree port sealing device for oil field

Abstract

The utility model relates to the technical field of petroleum engineering, and discloses a conversion type Christmas tree port sealing device for an oil field, which comprises two sealing sleeves, fixing plates are fixed at two ends of the two sealing sleeves, a lower base is arranged at the bottom of each sealing sleeve, clamping strips matched with the fixing plates are fixed on two sides of each lower base, and the fixing plates are fixed on the clamping strips. And an upper top seat is arranged at the top of the sealing sleeve, shells are fixed to the two sides of the top of the upper top seat correspondingly, fixing assemblies are installed in the shells, and each fixing assembly comprises a fixing block slidably connected to the interior of the corresponding shell. According to the conversion type Christmas tree port sealing device for the oil field, through the clamping strip and fixing plate clamping mode and the matched use of the fixing assembly, the sealing sleeve can be more rapidly disassembled and assembled, the whole process is rapid and convenient, bolts do not need to be used for fixing, and the sealing effect is good. And the situation of unstable fixation caused by abrasion of the bolt under the working condition of frequent disassembly is avoided.

Description

Technical Field

[0001] This utility model relates to the field of petroleum engineering technology, and in particular to a convertible wellhead sealing device for oil fields. Background Technology

[0002] Petroleum engineering is a general term for a series of engineering and technological processes implemented to extract oil and gas from deep underground reservoirs to the surface in an economical and efficient manner by establishing suitable flow channels and selecting optimal lifting methods based on the characteristics of oil and gas and reservoirs. It includes reservoir, drilling, oil production and oil surface engineering. In the oilfield production process, the wellhead tree is the core equipment for wellhead control. The sealing reliability of its various ports (such as valve interfaces, instrument interfaces, test interfaces, backup interfaces, etc.) is crucial. These ports are used to connect production pipelines, injection pipelines, monitoring instruments or other auxiliary equipment, and are key nodes for fluid control, pressure monitoring and production regulation.

[0003] Currently, oilfield wellhead ports are generally sealed using flange connections in conjunction with spiral wound gaskets, O-rings, or rubber gaskets. However, these traditional sealing methods have complex structural designs, resulting in time-consuming and labor-intensive installation and disassembly processes. This is especially true in space-constrained wellhead areas where frequent maintenance or equipment replacement requires a significant investment of manpower. Furthermore, after repeated tightening, flange bolts are prone to stress relaxation or damage to the flange sealing surface, leading to a decrease in sealing reliability when the equipment is reinstalled. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the flange connection sealing method commonly used in the current oilfield tree port has the disadvantage of being time-consuming and labor-intensive when performing frequent maintenance. To this end, we propose a convertible tree port sealing device for oilfields.

[0005] To achieve the above objectives, this application adopts the following technical solution: a convertible wellhead sealing device for oil fields, comprising two sealing sleeves, both ends of which are fixed with fixing plates.

[0006] The bottom of the sealing sleeve is provided with a lower base, and both sides of the lower base are fixed with clips that cooperate with the fixing plate. The top of the sealing sleeve is provided with an upper top seat, and both sides of the top of the upper top seat are fixed with a housing.

[0007] The housing is equipped with a fixing component, which includes a fixing block that is slidably connected to the inside of the housing. The top of the locking bar has a fixing groove that cooperates with the fixing block. A control rod is fixed to the top of the fixing block. The top of the housing has a stroke groove that is slidably connected to the control rod.

[0008] Preferably, a sliding rod is fixed to one end inside the housing, and a sliding hole is provided at the end of the fixing block away from the fixing groove to slide and connect with the sliding rod. A spring is sleeved on the surface of the sliding rod, one end of the spring is fixed to the fixing block, and the other end of the spring is fixed to the inner wall of the housing.

[0009] Preferably, the top and bottom of the sealing sleeve are provided with sealing grooves, the top of the lower base is provided with a first sealing gasket that cooperates with the sealing groove, and the bottom of the upper base is provided with a second sealing gasket that cooperates with the sealing sleeve.

[0010] Preferably, an annular drainage block is installed at the bottom of the lower base, and the annular drainage block is a hollow cylinder with an inner diameter that decreases linearly from bottom to top.

[0011] Preferably, an annular guide block is installed at the bottom of the upper seat. The annular guide block is a hollow cylinder with a constant inner diameter and an outer diameter that decreases linearly from top to bottom.

[0012] Preferably, an annular oil scraper is installed on the top of the lower base. The annular oil scraper has the same structure as the annular drainage block, and the annular oil scraper is installed upside down.

[0013] Preferably, the surface of the annular oil scraper block is provided with an oil drain hole that extends through to the annular drain block.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] In this invention, the sealing sleeve can be disassembled and installed more quickly by using the snap-fit ​​method of the clip and the fixing plate and the cooperation of the fixing components. The whole process is quick and convenient, and there is no need to use bolts for fixing, which avoids the situation where the bolts wear out and cause unstable fixing when frequently disassembling.

[0016] In this invention, when the tubing reciprocates inside the sealing sleeve, the lower base initially scrapes off the oil adhering to the surface of the tubing. The scraped oil is then guided back into the well by the annular guide block to prevent leakage. The annular guide block scrapes off the oil on the surface of the tubing, and the scraped oil flows into the interior of the sealing sleeve due to inertia, preventing it from being carried out at the top of the upper seat. The annular oil scraper guides the oil scraped by the annular guide block to accelerate the discharge of oil. The oil drain hole allows the oil to be quickly discharged during the flow guided by the annular oil scraper, and then discharged back into the well by the annular guide block, preventing accumulation inside the sealing sleeve. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 is an exploded view of the sealing sleeve of this utility model;

[0019] Figure 3 is a schematic diagram of the exploded structure of the fixing component of this utility model;

[0020] Figure 4 is a schematic diagram of the lower base and upper top base structure of this utility model;

[0021] Figure 5 is a cross-sectional view of the lower base of this utility model.

[0022] Legend: 1. Sealing sleeve; 2. Fixing plate; 3. Lower base; 4. Locking strip; 5. Upper top seat; 6. Housing; 7. Fixing block; 8. Fixing groove; 9. Slide rod; 10. Slide hole; 11. Control rod; 12. Stroke groove;

[0023] 13. Spring; 14. Sealing groove; 15. First sealing gasket; 16. Second sealing gasket; 17. Annular guide block;

[0024] 18. Annular oil scraper block; 19. Annular drain block; 20. Oil drain hole. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0026] Referring to Figures 1-5, this utility model provides a technical solution: a convertible wellhead sealing device for oil fields, comprising two sealing sleeves 1, with fixing plates 2 fixed at both ends of the two sealing sleeves 1, a lower base 3 provided at the bottom of the sealing sleeve 1, and clips 4 for cooperating with the fixing plates 2 fixed on both sides of the lower base 3, and an upper top seat 5 provided at the top of the sealing sleeve 1, with a housing 6 fixed on both sides of the top of the upper top seat 5;

[0027] The housing 6 contains a fixing assembly, which includes a fixing block 7 slidably connected inside the housing 6. The top of the locking strip 4 has a fixing groove 8 that mates with the fixing block 7. A control rod 11 is fixed to the top of the fixing block 7. The top of the housing 6 has a travel groove 12 that slidably connects with the control rod 11. The user places the lower base 3 and the upper top seat 5 onto the port surface, then fixes the lower base 3 to the wellhead. Next, the two sealing sleeves 1 are installed on the port surface. By moving the sealing sleeves 1 downwards, the locking strip 4 engages with the fixing plate 2, thus closing the sealing sleeves 1 and creating a sealed space inside. The upper top seat 5 is then installed on top of the sealing sleeve 1. The control rod 11 in the fixing assembly controls the movement of the fixing block 7, causing it to insert into the fixing groove 8 at the top of the locking strip 4, thus fixing the position of the upper top seat 5.

[0028] This seals the port. By using the snap-fit ​​method of the clip 4 and the fixing plate 2, as well as the cooperation of the fixing components, the sealing sleeve 1 can be disassembled and installed more quickly. The whole process is relatively quick and convenient, and there is no need to use bolts for fixing, which avoids the situation where the bolts wear out and cause unstable fixing when frequently disassembling.

[0029] Reference Figure 3 As shown in this embodiment: a sliding rod 9 is fixed at one end inside the housing 6, and a sliding hole 10 is provided at the end of the fixing block 7 away from the fixing groove 8, which is slidably connected to the sliding rod 9. A spring 13 is sleeved on the surface of the sliding rod 9. One end of the spring 13 is fixed to the fixing block 7, and the other end of the spring 13 is fixed to the inner wall of the housing 6. The sliding rod 9 and the sliding hole 10 guide the fixing block 7 and prevent the fixing block 7 from shifting when it moves inside the housing 6. The spring 13 limits the fixing block 7 when it is inserted into the fixing groove 8 and prevents the fixing block 7 from detaching from the inside of the fixing groove 8.

[0030] Reference Figure 2 As shown in this embodiment: sealing grooves 14 are provided at both the top and bottom of the sealing sleeve 1; a first sealing gasket 15 that cooperates with the sealing groove 14 is installed on the top of the lower base 3; and a second sealing gasket 16 that cooperates with the sealing sleeve 1 is installed on the bottom of the upper top seat 5. Through the cooperation of the sealing groove 14, the first sealing gasket 15 and the second sealing gasket 16, the sealing performance at the connection between the sealing sleeve 1 and the lower base 3 and between the sealing sleeve 1 and the upper top seat 5 is improved.

[0031] Reference Figure 5As shown in this embodiment: an annular drain block 19 is installed at the bottom of the lower base 3. The annular drain block 19 is a hollow cylinder with an inner diameter that decreases linearly from bottom to top. An annular guide block 17 is installed at the bottom of the upper top base 5. The annular guide block 17 is a hollow cylinder with a constant inner diameter and an outer diameter that decreases linearly from top to bottom. An annular oil scraper block 18 is installed at the top of the lower base 3. The annular oil scraper block 18 has the same structure as the annular drain block 19. The annular oil scraper block 18 is installed upside down. An oil drain hole 20 is opened on the surface of the annular oil scraper block 18, which extends through to the annular drain block 19. When the oil pipe reciprocates inside the sealing sleeve 1, the lower base 3 discharges oil from the surface of the oil pipe. The oil is initially scraped off, and the scraped oil is guided back into the well through the annular guide block 19 to avoid leakage. The annular guide block 17 is used to scrape off the oil on the surface of the tubing. The scraped oil will flow into the interior of the sealing sleeve 1 due to inertia along the outer surface of the annular guide block 17, preventing it from being carried out at the top of the upper seat 5. The annular oil scraper 18 is used to guide the oil scraped off by the annular guide block 17 to accelerate the discharge of oil. The oil discharge hole 20 is set to quickly discharge the oil when the annular oil scraper 18 is guiding it, and then discharge it back into the oil well through the annular guide block 19 to avoid accumulation inside the sealing sleeve 1.

[0032] Working Principle: The user places the lower base 3 and upper top seat 5 onto the port surface, then fixes the lower base 3 to the wellhead. Next, the two sealing sleeves 1 are installed on the port surface. By moving the sealing sleeves 1 downwards, the locking strip 4 engages with the fixing plate 2, thus closing the sealing sleeves 1 and creating a sealed space inside. The upper top seat 5 is then installed on top of the sealing sleeve 1. The control rod 11 in the fixing assembly controls the movement of the fixing block 7, causing it to insert into the fixing groove 8 at the top of the locking strip 4, fixing the position of the upper top seat 5 and sealing the port. The sliding rod 9 and sliding hole 10 guide the fixing block 7, preventing it from shifting inside the housing 6. The spring 13 limits the fixing block 7 when it engages with the fixing groove 8, preventing it from detaching from the groove. The locking method of the locking strip 4 and fixing plate 2, along with the coordinated use of the fixing assembly, ensures a secure seal. This allows for faster disassembly and installation of the sealing sleeve 1. Through the coordinated use of the sealing groove 14, the first sealing gasket 15, and the second sealing gasket 16, the sealing performance between the sealing sleeve 1 and the lower base 3, as well as between the sealing sleeve 1 and the upper top seat 5, is improved. When the tubing reciprocates inside the sealing sleeve 1, the lower base 3 initially scrapes away the oil adhering to the surface of the tubing. The scraped oil is then guided back into the well via the annular guide block 19, preventing leakage. The setting of 17 scrapes the oil off the surface of the tubing. The scraped oil will flow along the outer surface of the annular guide block 17 into the interior of the sealing sleeve 1 due to inertia, preventing it from being carried out at the top of the upper seat 5. The annular oil scraper 18 guides the oil scraped by the annular guide block 17 to accelerate the discharge of oil. The setting of the oil drain hole 20 can quickly discharge the oil when the annular oil scraper 18 guides the flow, and then discharge it into the oil well through the annular drain block 19 to prevent it from accumulating inside the sealing sleeve 1.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A conversion Xmas tree port sealing device for oil field, comprising two sealing sleeves (1), characterized in that: Both ends of the two sealing sleeves (1) are fixed with fixing plates (2), the bottom of the sealing sleeve (1) is provided with a lower base (3), both sides of the lower base (3) are fixed with clips (4) that cooperate with the fixing plates (2), the top of the sealing sleeve (1) is provided with an upper top seat (5), and both sides of the top of the upper top seat (5) are fixed with a housing (6). The housing (6) is equipped with a fixing component, which includes a fixing block (7) that is slidably connected to the inside of the housing (6). The top of the clip (4) is provided with a fixing groove (8) that cooperates with the fixing block (7). A control rod (11) is fixed to the top of the fixing block (7). The top of the housing (6) is provided with a travel groove (12) that is slidably connected to the control rod (11).

2. A conversion tree port sealing device for oil fields as claimed in claim 1, wherein: A sliding rod (9) is fixed at one end inside the housing (6). A sliding hole (10) is opened at the end of the fixing block (7) away from the fixing groove (8) to slide and connect with the sliding rod (9). A spring (13) is sleeved on the surface of the sliding rod (9). One end of the spring (13) is fixed to the fixing block (7), and the other end of the spring (13) is fixed to the inner wall of the housing (6).

3. A conversion tree port sealing device for oil fields as claimed in claim 1, wherein: The top and bottom of the sealing sleeve (1) are provided with sealing grooves (14), the top of the lower base (3) is equipped with a first sealing gasket (15) that works with the sealing groove (14), and the bottom of the upper base (5) is equipped with a second sealing gasket (16) that works with the sealing sleeve (1).

4. The convertible Christmas tree port sealing device of claim 1, wherein: The bottom of the lower base (3) is equipped with an annular drainage block (19), which is a hollow cylinder with an inner diameter that decreases linearly from bottom to top.

5. The convertible Christmas tree port sealing device of claim 1, wherein: The bottom of the upper seat (5) is equipped with an annular guide block (17), which is a hollow cylinder with a constant inner diameter and a linearly decreasing outer diameter from top to bottom.

6. The convertible Christmas tree port sealing device of claim 1, wherein: The bottom base (3) is equipped with an annular oil scraper (18), which has the same structure as the annular drain block (19), and the annular oil scraper (18) is installed upside down.

7. The oilfield conversion type wellhead port sealing device according to claim 6, characterized in that: The surface of the annular oil scraper (18) is provided with an oil drain hole (20) that extends through to the annular drain block (19).

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