A CJH type bidirectional pressure-bearing plug

Abstract

The utility model discloses a CJH type two -way pressure -bearing plug, include: the upper joint, one end is used for connecting down -hole tool or fishing tool, and the intermediate device, one end coaxial sleeve is established in the other end outside of upper joint, lower joint, one end with the other end coaxial connection of intermediate device, the valve core, it is slidably arranged in lower joint, and the valve core is optional open or close, the plug, with the other end detachable coaxial connection of lower joint, wherein, the other end optional in the intermediate device of upper joint is sliding or positioning, when one end of upper joint is away from the intermediate device, the valve core is the closed state, when one end of upper joint is close to the intermediate device, the valve core is the open state. The utility model has the characteristics of reasonable design, compact, simple to use, good universality can be conveniently down -hole and fishing through the steel wire or steel wire rope operation in the high temperature and high pressure well.

Description

Technical Field

[0001] This utility model relates to the field of plugging technology, and more specifically, to a CJH type bidirectional pressure-bearing plugging device. Background Technology

[0002] The CJH type bidirectional pressure-bearing plug is used to seal the pressure connection between the upper and lower parts of the production tubing at a certain depth in offshore oil and gas fields. Its function is to seal a specific location on the production tubing when tools such as packers and safety valve cores fail, or when sealing operations are required, thus preventing the pressure connection between the upper and lower parts. Furthermore, the CJH type bidirectional pressure-bearing plug can simultaneously seal the high pressure at both the upper and lower parts under high temperature conditions, facilitating safe operation of the upper part of the plug.

[0003] However, existing plugs are complex in structure, difficult to manufacture, have poor versatility, and are expensive. In terms of application, most of them cannot be used in high-temperature and high-pressure well conditions, especially in high-temperature and high-pressure wells in the deep sea. Utility Model Content

[0004] This invention designs and develops a CJH-type bidirectional pressure-bearing plug, which can safely seal the pressure of the production tubing on its own. It has a compact structure, is easy to use, has strong versatility, is recyclable and reusable, and has higher safety and stability.

[0005] The technical solution provided by this utility model is as follows:

[0006] A CJH type bidirectional pressure-bearing plug, comprising:

[0007] The upper connector, one end of which is used to connect to the lowering tool or retrieval tool; and

[0008] The intermediate device has one end coaxially sleeved on the outside of the other end of the upper connector;

[0009] The lower connector has one end coaxially connected to the other end of the intermediate device;

[0010] A valve core, which is slidably disposed in the lower connector, and the valve core is selectively openable or closed;

[0011] A plug, one end of which is detachably coaxially connected to the other end of the lower connector;

[0012] The other end of the upper connector can be selectively slid or positioned in the intermediate device. When one end of the upper connector is away from the intermediate device, the valve core is in a closed state, and when one end of the upper connector is close to the intermediate device, the valve core is in an open state.

[0013] Preferably, the upper connector is a cylindrical structure, and a stepped structure is provided on the outer side of the middle part of the upper connector, and the outer diameter of one end of the upper connector is larger than the outer diameter of the other end.

[0014] Preferably, it also includes:

[0015] The first groove is annularly arranged on the outer side of the other end of the upper connector;

[0016] The second groove is arranged in a ring on the outer side of the other end of the upper connector, and the second groove is spaced apart from the first groove.

[0017] The first groove is located near the stepped structure.

[0018] Preferably, it also includes:

[0019] The inner cylinder has an outer diameter at one end that is larger than the outer diameter at the other end, and one end of the inner cylinder is coaxially connected to the other end of the upper connector.

[0020] Preferably, the intermediate device includes:

[0021] A connecting sleeve is fitted over the other end of the upper connector, and one end of the connecting sleeve is a flange structure;

[0022] The positioning key sleeve has one end coaxially connected to the other end of the connecting sleeve and the other end coaxially connected to one end of the lower connector. The inner side of the positioning key sleeve is provided with a first-level step and a second-level step at intervals.

[0023] The mounting slot is provided between the first-level step and the second-level step;

[0024] The flange structure can be selectively engaged with the step structure, and one end of the positioning key sleeve is engaged with the flange structure. A receiving cavity is formed between the first-level step, the other end of the connecting sleeve and the upper connector. The other end of the inner cylinder can be selectively engaged with the second-level step.

[0025] Preferably, it also includes:

[0026] A locking ring is disposed in the receiving cavity;

[0027] A retaining ring is disposed at the lower end of the locking ring, and the retaining ring is disposed in the receiving cavity;

[0028] The locking ring can be selectively engaged in the first groove or the second groove.

[0029] Preferably, it also includes:

[0030] A positioning key, which is disposed in the mounting groove, is used to limit the positioning of the inner cylinder.

[0031] Preferably, it also includes:

[0032] The sealing device is fitted onto the outside of the locating key sleeve near the lower connector.

[0033] Preferably, it also includes:

[0034] Through holes are provided on both sides of the lower connector near the positioning key sleeve;

[0035] When the valve core is in the open state, the through hole is provided corresponding to the valve core.

[0036] Preferably, the other end of the plug is a blind end, and the outer side of the other end of the plug has a beveled structure.

[0037] The beneficial effects of this utility model are as follows:

[0038] The CJH-type bidirectional pressure-bearing plug provided by this utility model is a recyclable and reusable type. Its simple and reasonable structural design makes it convenient, safe, and reliable for practical use. Different specifications of plugs can be matched with different specifications of tubing, offering high flexibility and versatility. When in use, the plug can be lowered into the well to seal the pressure at a certain depth of the production tubing, preventing pressure continuity and disruption to operations. When sealing is no longer needed, the valve core at the lower end of the plug can be opened, and the pressure will gradually balance through the balance hole on the lower connector, while the plug remains fixed downhole. This prevents accidents caused by excessive pressure differentials that could cause the tool to overturn. Because the CJH-type bidirectional pressure-bearing plug can withstand high temperatures and pressures not only in land wells but also in deep-sea wells, and is conveniently lowered and retrieved using wire or wire rope, it offers superior safety and reliability compared to other products. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the initial state structure of the CJH type bidirectional pressure-bearing plugger described in this utility model.

[0040] Figure 2 This is a schematic diagram of the seated state structure of the CJH type bidirectional pressure-bearing plugger described in this utility model. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0042] like Figure 1 As shown, the CJH type bidirectional pressure-bearing plug provided by this utility model includes:

[0043] Upper connector 110, locking ring 111, retaining ring 112, connecting sleeve 120, positioning key sleeve 130, positioning key 131, inner cylinder 140, lower connector 150, plug 160 and valve core 170;

[0044] The upper connector 110 is a cylindrical structure, meaning that a through hole is axially opened inside the upper connector 110. The outer side of the middle part of the upper connector 110 is provided with a stepped structure, and the corresponding inner side is a funnel-shaped structure. That is, the outer diameter of one end of the upper connector 110 is larger than the outer diameter of the other end. The inner side of one end of the upper connector 110 is provided with an inner retrieval neck for connecting a lowering tool or a retrieval tool. The other end is provided with an external thread. At the same time, an annular first groove and a second groove are provided at intervals on the outer side of the other end of the upper connector 110, and the first groove is close to the stepped structure.

[0045] In this embodiment, the second groove is the threaded relief groove at the other end of the upper connector 110.

[0046] One end of the inner cylinder 140 has an internal thread structure for threaded connection with the other end of the upper connector 110. That is, one end of the inner cylinder 140 is sleeved on the other end of the upper connector 110 through the internal thread. The outer diameter of the inner cylinder 140 is a variable diameter structure, that is, the outer diameter of one end is larger than the outer diameter of the other end.

[0047] In this embodiment, the inner cylinder 140 and the upper connector 110 are fixed together by set screws.

[0048] The connecting sleeve 120 is a cylindrical structure, sleeved on the outside of the other end of the upper connector 110, and one end of the connecting sleeve 120 is provided with a flange structure for selectively engaging with the stepped structure of the upper connector 110, and the other end of the connecting sleeve 120 is an external thread structure.

[0049] In this embodiment, the upper outer side of the connecting sleeve 120 is provided with symmetrical holes for installation and disassembly.

[0050] One end of the positioning key sleeve 130 has an internal thread structure, and the other end has an external thread structure. A first-level step and a second-level step are provided at intervals on the inner side of the positioning key sleeve 130, and an installation groove is provided between the first-level step and the second-level step for installing the positioning key 131. A smooth surface is provided on the outer side near the other end for installing the sealing device 180.

[0051] One end of the positioning key sleeve 130 is threaded onto the other end of the connecting sleeve 120, and a receiving cavity is formed between the other end of the connecting sleeve 120, the upper connector 110, and the first-level step. A locking ring 111 and a retaining ring 112 are provided in the receiving cavity. The retaining ring 112 is used to block the locking ring 111. At the same time, the locking ring 111 and the retaining ring 112 can be selectively matched and embedded into the first groove or the second groove, and limited by the upper connector 110. The second-level step is used to limit the inner cylinder 140, that is, the other end of the inner cylinder 140 can be selectively engaged on the second-level step.

[0052] A shearing screw hole is provided in the middle of the positioning key sleeve 130 for installing shearing screws, which facilitates the operation of tools later.

[0053] The upper end of the positioning key 131 is matched and inserted into the mounting groove of the positioning key sleeve 130, and the lower end of the positioning key 131 is matched and inserted into the outer wall of the sliding sleeve. The positioning key 131 has a groove in the middle for pressing with a spring, which is used to limit the inner cylinder 140.

[0054] In this embodiment, the positioning key sleeve 130 and the connecting sleeve 120 are fixed together by a set screw 121.

[0055] One end of the lower connector 150 is connected to the other end of the positioning key sleeve 130 via an internal thread, and the other end is provided with an external thread. A boss is provided on the outside of the lower connector 150 for limiting the overall position of the device.

[0056] In this embodiment, the lower connector 150 has a through hole near the positioning key sleeve 130 for flow and exhaust.

[0057] The lower end of the valve core 170 is provided with a retractable opening groove along the radial direction. The valve core 170 is matched and inserted into the inner wall of the lower connector 150 and fixed by the boss structure on the inner side of the lower connector 150.

[0058] The upper inner side of the plug 160 is connected to the other end of the lower connector 150 via an internal thread. The lower end is a blind end to prevent fluid from passing through. The lower outer side of the plug 160 has a beveled structure for guiding the tool.

[0059] Two grooves are provided on the outer side of the valve core 170 to accommodate the second O-ring seal 192 and the sealing support.

[0060] In this embodiment, the other end of the upper connector 110, the inner cylinder 140, the positioning key sleeve 130, and the valve core 170 all have the same inner diameter.

[0061] In this embodiment, the positioning key sleeve and the lower connector are further limited by a limiting boss, and a first O-ring seal 191 is provided at the contact point.

[0062] The working process of the CJH type bidirectional pressure-bearing plugger described in this utility model is as follows:

[0063] After the CJH-type bidirectional pressure-bearing plugger has been inspected and confirmed to be correct, it is lowered into the well. During lowering, the plugger is in the open position (e.g., ...). Figure 1 Connect the plug to the matching downhole tool via a pin and a locating key sleeve. Once the plug is lowered to the pre-positioned sub-seat position, vibrate downwards to cut the pin on the downhole tool. At this point, the upper connector will push the inner cylinder downwards. When the inner cylinder engages with the locating key sleeve, the locating key on the plug will open due to the action of the inner cylinder, and simultaneously, the locating key will be seated inside the sub-seat. Vibrate downwards again to cut the pin connecting the downhole tool and the plug's locating key sleeve, ensuring the valve core is open. Remove the downhole tool upwards without pulling the plug out, confirming that the plug has been correctly positioned. The plug has now separated the upper and lower pressures of the production tubing (e.g., ...). Figure 2 It can be used for upper-level operations or pressure testing.

[0064] When the CJH type bidirectional pressure-bearing plug is retrieved, the retrieval device and retrieval rod are lowered using a steel wire or cable. When the retrieval device reaches the upper part of the plug, it is vibrated downwards to grab the inner retrieval neck at the top of the plug. The valve core is opened by the retrieval rod, and the retrieval device is vibrated upwards. The inner retrieval neck will drive the connecting sleeve to move upwards. At this time, the positioning key will retract under the action of force, and the plug can then be retrieved from the well by the retrieval device.

[0065] Assembly process of the CJH type bidirectional pressure-bearing plugger described in this utility model:

[0066] First, install the connecting sleeve onto the upper connector. Then, install the locking ring and retaining ring onto the upper connector in sequence. Install the inner cylinder onto the threaded end of the upper connector and secure it with the set screw. Move the locking ring and retaining ring to the second groove of the upper connector. Install the locating key into the locating key sleeve. Install the assembled upper connector assembly into the locating key sleeve. Screw the connecting sleeve into the locating key sleeve and secure it with the set screw. Install the sealing device onto the sealing platform of the locating key sleeve. Install the first O-ring seal into the sealing groove of the locating key sleeve. Assemble the second O-ring seal onto the valve core. Install the valve core into the lower connector. Connect the lower connector to the lower end of the locating key sleeve. Finally, connect the plug to the lower end of the lower connector. Install all the shearing screws into the shearing screw holes of the locating key sleeve.

[0067] This invention relates to a CJH-type bidirectional pressure-bearing plug, a recyclable and reusable type. Its simple and rational design makes it convenient, safe, and reliable for practical use. Different plug sizes can be matched with different tubing sizes, offering high flexibility and versatility. When in use, the plug is lowered into the well to seal the pressure at a specific depth of the production tubing, preventing pressure leakage and disruption to operations. When sealing is no longer needed, the valve core at the lower end of the plug can be opened, allowing the pressure to gradually equalize through the balance hole on the lower connector, while the plug remains fixed downhole. This prevents accidents caused by excessive pressure differentials that could cause the tool to overshoot. Because the CJH-type bidirectional pressure-bearing plug can withstand high temperatures and pressures not only in land wells but also in deep-sea wells, and is easily lowered and retrieved using wire or wire rope, it offers superior safety and reliability compared to other products.

[0068] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A CJH-type bidirectional pressure-bearing plug, characterized in that, include: The upper connector, one end of which is used to connect the lowering tool or the salvage tool; as well as The intermediate device has one end coaxially sleeved on the outside of the other end of the upper connector; The lower connector has one end coaxially connected to the other end of the intermediate device; A valve core, which is slidably disposed in the lower connector, and the valve core is selectively openable or closed; A plug, one end of which is detachably coaxially connected to the other end of the lower connector; The other end of the upper connector can be selectively slid or positioned in the intermediate device. When one end of the upper connector is away from the intermediate device, the valve core is in a closed state, and when one end of the upper connector is close to the intermediate device, the valve core is in an open state.

2. The CJH type bidirectional pressure-bearing plug as described in claim 1, characterized in that, The upper connector is a cylindrical structure, and a stepped structure is provided on the outer side of the middle part of the upper connector. The outer diameter of one end of the upper connector is larger than the outer diameter of the other end.

3. The CJH type bidirectional pressure-bearing plug as described in claim 2, characterized in that, Also includes: The first groove is annularly arranged on the outer side of the other end of the upper connector; The second groove is arranged in a ring on the outer side of the other end of the upper connector, and the second groove is spaced apart from the first groove. The first groove is located near the stepped structure.

4. The CJH type bidirectional pressure-bearing plug as described in claim 3, characterized in that, Also includes: The inner cylinder has an outer diameter at one end that is larger than the outer diameter at the other end, and one end of the inner cylinder is coaxially connected to the other end of the upper connector.

5. The CJH type bidirectional pressure-bearing plug as described in claim 4, characterized in that, The intermediate device includes: A connecting sleeve is fitted over the other end of the upper connector, and one end of the connecting sleeve is a flange structure; The positioning key sleeve has one end coaxially connected to the other end of the connecting sleeve and the other end coaxially connected to one end of the lower connector. The inner side of the positioning key sleeve is provided with a first-level step and a second-level step at intervals. The mounting slot is provided between the first-level step and the second-level step; The flange structure can be selectively engaged with the step structure, and one end of the positioning key sleeve is engaged with the flange structure. A receiving cavity is formed between the first-level step, the other end of the connecting sleeve and the upper connector. The other end of the inner cylinder can be selectively engaged with the second-level step.

6. The CJH type bidirectional pressure-bearing plug as described in claim 5, characterized in that, Also includes: A locking ring is disposed in the receiving cavity; A retaining ring is disposed at the lower end of the locking ring, and the retaining ring is disposed in the receiving cavity; The locking ring can be selectively engaged in the first groove or the second groove.

7. The CJH type bidirectional pressure-bearing plug as described in claim 6, characterized in that, Also includes: A positioning key, which is disposed in the mounting groove, is used to limit the positioning of the inner cylinder.

8. The CJH type bidirectional pressure-bearing plug as described in claim 7, characterized in that, Also includes: The sealing device is fitted onto the outside of the locating key sleeve near the lower connector.

9. The CJH type bidirectional pressure-bearing plug as described in claim 8, characterized in that, Also includes: Through holes are provided on both sides of the lower connector near the positioning key sleeve; When the valve core is in the open state, the through hole is provided corresponding to the valve core.

10. The CJH type bidirectional pressure-bearing plug as described in claim 9, characterized in that, The other end of the plug is a blind end, and the outer side of the other end of the plug has a beveled structure.

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