insulated pup joint

Abstract

This invention discloses a heat-insulating short section, comprising a shell, a connecting sleeve connected to the lower end of the shell, and a charging short section connected to the lower end of the connecting sleeve. A graphite liner is provided on the inner wall of the charging short section. A heat-resistant plug, in contact with the inner wall of the graphite liner, is movably disposed within the charging short section. A fixed seat is provided within the shell, forming a movable cavity between the fixed seat and the connecting sleeve. A piston cylinder is disposed within the movable cavity. A placement cavity for placing cables is provided at the upper end of the fixed seat, and an installation cavity is provided at the lower end. A propulsion mechanism for driving the piston cylinder is installed within the installation cavity, and the propulsion mechanism is connected to the cables in the placement cavity. A first through hole is formed on the side wall of the piston cylinder, and a second through hole is formed on the shell that mates with the first through hole. This invention can connect to the external air pressure of the cutting tool, allowing high-pressure gas generated during the cutting process to enter the heat-insulating short section and drive the heat-resistant plug forward, thereby pushing the thermite forward and ensuring the cutting effect of the cutting tool.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation technology for downhole cutting devices, and more specifically, to a thermal insulation short section. Background Technology

[0002] When cutting the tubing in the well, the heat generated by the cutting is conducted through the metal structure of the cutting tool. If the temperature is too high, it will affect the operation of the control electrical equipment at the top of the cutting device. Therefore, a heat-insulating short section needs to be installed at the bottom of the control electrical equipment to reduce the heat conduction to the control electrical equipment.

[0003] The existing heat insulation section is set between the charge section and the control section, and only serves as a heat insulation function. After the thermite in the charge section has been burning for a period of time, the cutting speed and temperature cannot meet the cutting requirements because the rear end of the thermite is far from the nozzle of the cutting device.

[0004] Therefore, this application designs a heat-insulating short section that can push the thermite to a position close to the injection port, thus ensuring the cutting efficiency of the cutting device. Summary of the Invention

[0005] The purpose of this invention is to overcome the aforementioned problems in the prior art and provide a heat-insulating short section. This invention allows the high-pressure gas generated during the cutting process to enter the heat-insulating short section and drive the heat-resistant plug forward by connecting to the external air pressure of the cutting tool. This, in turn, propels the thermite forward, ensuring the cutting effect of the cutting tool.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A heat-insulating short section, characterized in that: it includes a shell, a connecting sleeve is sealed and fixedly connected to the lower end of the shell, a charge short section is sealed and fixedly connected to the lower end of the connecting sleeve, a graphite liner is provided on the inner wall of the charge short section, a heat-resistant plug that is movably disposed inside the charge short section and contacts the inner wall of the graphite liner, a fixed seat is sealed and fixedly disposed inside the shell, a movable cavity is formed between the fixed seat and the connecting sleeve, a piston cylinder is disposed in the movable cavity, a placement cavity for placing cables is provided at the upper end of the fixed seat by a blind hole with an upward opening, and an installation cavity is provided at the lower end by a blind hole with a downward opening, the installation cavity is connected to the movable cavity, the central channel of the piston cylinder is connected to the installation cavity, the central channel of the connecting sleeve is connected to the movable cavity, a propulsion mechanism for pushing the piston cylinder is installed in the installation cavity, the propulsion mechanism is connected to the cable in the placement cavity; a first through hole is opened on the side wall of the piston cylinder, and a second through hole that mates with the first through hole is opened on the shell.

[0008] When the heat insulation short section is in its initial state without cutting by the cutting device, the second through hole is located below the first through hole, and the piston cylinder blocks the second through hole. The heat-resistant plug is attached to the lower end of the connecting sleeve and closes the central through hole of the connecting sleeve.

[0009] When the heat insulation section is in its initial state before the cutting device cuts, the piston cylinder is attached to the lower end of the mounting cavity, and the central channel of the piston cylinder is partially connected to the opening of the mounting cavity.

[0010] When the cutting device is in operation, the piston cylinder moves downwards until the first through hole and the second through hole are connected.

[0011] The connecting sleeve is fitted with a third sealing ring at both ends; the fixed seat is fitted with a first sealing ring; the piston cylinder is fitted with three second sealing rings, one of which is located between the first through hole and the second through hole, and the first through hole and the second through hole are located between the other two second sealing rings.

[0012] A screw is threaded through the housing, and the screw is located between the two first sealing rings. The fixing seat is connected to the housing through the screw.

[0013] The inner wall of the movable cavity is provided with an annular groove for supporting the piston cylinder, and a second sealing ring at the bottom end is disposed in the annular groove.

[0014] A sealing plug for sealing the placement cavity is provided at the opening of the placement cavity.

[0015] The heat-resistant plug has a groove on its upper surface to facilitate the action of high-pressure gas on the heat-resistant plug, and the groove is located at the center of the upper surface of the heat-resistant plug.

[0016] The heat-resistant plug is a graphite heat-resistant plug.

[0017] The propulsion mechanism is made of high-energy materials or mechanical devices, preferably high-energy materials.

[0018] The advantages of using this invention are:

[0019] 1. The present invention drives the piston cylinder to move forward through a propulsion mechanism. The first through hole on the piston cylinder is connected to the second through hole on the housing. By connecting the air pressure outside the cutting tool, the high-pressure gas generated during the cutting process enters the heat insulation short section and drives the heat-resistant plug to move forward, thereby pushing the thermite forward and ensuring the cutting effect of the cutting tool.

[0020] 2. The piston cylinder provided in this invention can block the second through hole when the cutting device is not cutting, thus preventing moisture in the tubing from entering the insulation short section and then immersing in the thermite, which would affect the combustion of the thermite.

[0021] 3. The mounting base of the present invention is also provided with a placement cavity for placing cables, which facilitates the control of the pushing mechanism. In addition, the placement cavity is sealed with a sealing plug, so that the cables can be better preserved in the placement cavity.

[0022] 4. The heat-resistant plug in this invention is a graphite heat-resistant plug, which is not only heat-resistant but also has a certain degree of self-lubrication, which facilitates the movement of the heat-resistant plug. Combined with the graphite liner, the heat-resistant plug is easier to move, reducing the driving force of the heat-resistant plug due to frictional wear.

[0023] 5. The present invention has a groove on the upper surface of the heat-resistant plug. The groove facilitates the application of high-pressure gas to the heat-resistant plug, ensuring the efficiency of pushing the heat-resistant plug.

[0024] 6. The present invention provides a first sealing ring, a second sealing ring, and a third sealing ring to seal the gap. This firstly prevents air leakage and ensures the driving force of the high-energy material propulsion mechanism and the driving force of the external high-pressure gas on the heat-resistant plug. Secondly, the second sealing ring seals the second through hole to ensure the sealing effect of the piston cylinder. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0027] The markings in the diagram are as follows: 1-Shell; 2-Fixing seat; 3-Sealing plug; 4-First sealing ring; 5-Screw; 6-Placement cavity; 7-Mounting cavity; 8-Second sealing ring; 9-First through hole; 10-Second through hole; 11-Piston cylinder; 12-Moving cavity; 13-Third sealing ring; 14-Connecting sleeve; 15-Groove; 16-Purpose charging section; 17-Graphite liner; 18-Heat-resistant plug; 19-Annular groove. Detailed Implementation

[0028] Example 1

[0029] A heat-insulating short section includes a shell 1, a connecting sleeve 14 sealed and fixedly connected to the lower end of the shell 1, a charge short section 16 sealed and fixedly connected to the lower end of the connecting sleeve 14, a graphite liner 17 provided on the inner wall of the charge short section 16, a heat-resistant plug 18 movably disposed within the charge short section 16 in contact with the inner wall of the graphite liner 17, a fixing seat 2 sealed and fixedly disposed within the shell 1, a movable cavity 12 formed between the fixing seat 2 and the connecting sleeve 14, a piston cylinder 11 disposed within the movable cavity 12, and an opening extending from the upper end of the fixing seat 2. The upper blind hole forms a placement cavity 6 for placing cables, and the lower end is provided with an installation cavity 7 formed by a downward-opening blind hole. The installation cavity 7 is connected to the movable cavity 12. The central channel of the piston cylinder 11 is connected to the installation cavity 7, and the central channel of the connecting sleeve 14 is connected to the movable cavity 12. A propulsion mechanism for pushing the piston cylinder 11 to move is installed in the installation cavity 7. The propulsion mechanism is connected to the cables in the placement cavity 6. A first through hole 9 is opened on the side wall of the piston cylinder 11, and a second through hole 10 that cooperates with the first through hole 9 is opened on the housing 1.

[0030] When the heat insulation short section is in the initial state before the cutting device cuts, the second through hole 10 is located below the first through hole 9, and the piston cylinder 11 blocks the second through hole 10. The heat-resistant plug 18 is attached to the lower end of the connecting sleeve 14 and closes the central through hole of the connecting sleeve 14.

[0031] When the heat insulation section is in its initial state without being cut by the cutting device, the piston cylinder 11 is attached to the lower end of the mounting cavity 7, and the central channel of the piston cylinder 11 is partially connected to the opening of the mounting cavity 7.

[0032] When the heat insulation short section is in the cutting state of the cutting device, the piston cylinder 11 moves downward to connect the first through hole 9 and the second through hole 10.

[0033] The two ends of the connecting sleeve 14 are fitted with third sealing rings 13; the fixed seat 2 is fitted with a first sealing ring 4; the piston cylinder 11 is fitted with three second sealing rings 8, one of which is located between the first through hole 9 and the second through hole 10, and the first through hole 9 and the second through hole 10 are located between the other two second sealing rings 8.

[0034] A screw 5 is threaded through the housing 1, and the screw 5 is located between the two first sealing rings 4. The fixing seat 2 is connected to the housing 1 through the screw 5.

[0035] The inner wall of the movable cavity 12 is provided with an annular groove 19 for supporting the piston cylinder 11, and a second sealing ring 8 at the lowest end is disposed in the annular groove 19.

[0036] A sealing plug 3 is provided at the opening of the placement cavity 6 to seal the placement cavity 6.

[0037] The upper surface of the heat-resistant plug 18 is provided with a groove 15 to facilitate the action of high-pressure gas on the heat-resistant plug 18, and the groove 15 is located at the center of the upper surface of the heat-resistant plug 18.

[0038] The heat-resistant plug 18 is a graphite heat-resistant plug.

[0039] The propulsion mechanism is made of high-energy materials or mechanical devices, preferably high-energy materials.

[0040] Example 2

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] The following is combined Figure 1 , Figure 2 The present invention will be described in detail below.

[0044] A heat-insulating short section includes a housing 1, with a connecting sleeve 14 connected to the lower end of the housing 1. A charging short section 16 is connected to the lower end of the connecting sleeve 14. A graphite liner 17 is disposed inside the charging short section 16, and a heat-resistant plug 18, in contact with the inner wall of the graphite liner 17, is movably disposed within the charging short section 16. A fixing seat 2 is connected inside the housing 1, and a movable cavity 12 is provided between the fixing seat 2 and the connecting sleeve 14. A piston cylinder 11 is movably disposed within the movable cavity 12. A mounting cavity 7 is provided at the lower end of the fixing seat 2, and a propulsion mechanism for moving the piston cylinder 11 is installed within the mounting cavity 7. A first through hole 9 is formed on the side wall of the piston cylinder 11, and a second through hole 10 is formed on the housing 1 below the first through hole 9. The piston cylinder 11 can seal the second through hole 10 when the cutting device is not cutting, preventing moisture from the tubing from entering the heat-insulating short section and then immersing the thermite, thus affecting the combustion of the thermite. The mounting base 2 is also provided with a placement cavity 6 for placing cables, which facilitates the control of the pushing mechanism. In addition, the sealing plug 3 seals the placement cavity 6, so that the cables can be better preserved in the placement cavity 6.

[0045] The heat-resistant plug 18 is made of graphite. High-purity graphite is not only heat-resistant, but also has a certain degree of self-lubrication, which facilitates the movement of the heat-resistant plug 18. Combined with the graphite liner 17, the heat-resistant plug 18 is easier to move, reducing the driving force of the heat-resistant plug 18 due to frictional wear.

[0046] The upper surface of the heat-resistant plug 18 is provided with a groove 15. The groove 15 facilitates the application of high-pressure gas to the heat-resistant plug 18, ensuring the efficiency of pushing the heat-resistant plug 18.

[0047] The propulsion mechanism is a high-energy material propulsion mechanism. This mechanism utilizes the thrust generated by the explosion of a controllable combustible material to move the piston cylinder 11. While mechanical devices such as telescopic devices or screw drives can also be used, these require significant installation space, making them inconvenient for installation within the insulation section. Furthermore, mechanical devices are prone to malfunctions, potentially preventing the piston cylinder 11 from moving as expected. In contrast, the high-energy material propulsion mechanism requires less space and has a very low probability of problems, making it the preferred choice. Initially, the piston cylinder 11 is fitted against the lower end of the mounting cavity 7. At this point, the channel in the middle of the piston cylinder 11 connects to the opening of the mounting cavity 7, but the opening is small. This design allows high-pressure gas to be promptly discharged from the mounting cavity 7 during the high-energy material explosion, preventing damage from the explosion due to delayed gas release.

[0048] The connecting sleeve 14 is fitted with third sealing rings 13 at both ends, the fixed seat 2 is fitted with a first sealing ring 4, and the piston cylinder 11 is fitted with three second sealing rings 8. One of the second sealing rings 8 is located between the first through hole 9 and the second through hole 10, and the first through hole 9 and the second through hole 10 are located between the other two second sealing rings 8. The first sealing ring 4, the second sealing ring 8, and the third sealing ring 13 seal the gaps, which firstly prevents air leakage and ensures the driving force of the high-energy material propulsion mechanism and the driving force of the external high-pressure gas on the heat-resistant plug 18; secondly, the second sealing ring 8 seals the second through hole 10, ensuring the sealing effect of the piston cylinder 11.

[0049] A screw 5 is threaded through the housing 1, and the fixing seat 2 is detachably connected to the housing 1 via the screw 5. Two first sealing rings 4 are provided, located on both sides of the screw 5. The screw 5 facilitates the disassembly of the fixing seat 2 for maintenance, and the first sealing rings 4 on both sides of the screw 5 seal the gap at the screw 5, preventing air and water leakage.

[0050] The inner wall of the movable cavity 12 is provided with an annular groove 19, and the second sealing ring 8 is disposed in the annular groove 19. The annular groove 19 is provided so that the second sealing ring 8 is engaged in the annular groove 19, which can support the piston cylinder 11 and prevent the piston cylinder 11 from automatically moving down during the process of the cutting device being lowered into the tube column, which would cause the first through hole 9 and the second through hole 10 to connect prematurely.

[0051] Working process: After the cutting has been going on for a period of time, the high-energy material propulsion mechanism is controlled to work on the ground. The high-energy material explodes in the installation cavity 7 to generate high-pressure gas. The high-pressure gas pushes the piston cylinder 11 to move downward. When the piston cylinder 11 contacts the connecting sleeve 14, the first through hole 9 and the second through hole 10 are connected. The high-pressure gas generated by the cutting enters the housing 1 from the first through hole 9 and the second through hole 10 and moves downward, thereby pushing the heat-resistant plug 18 downward and pushing the thermite to a position close to the cutting nozzle.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An insulated nipple characterized by: The device includes a housing (1), a connecting sleeve (14) which is sealed and fixedly connected to the lower end of the housing (1), a charging section (16) which is sealed and fixedly connected to the lower end of the connecting sleeve (14), a graphite liner (17) which is provided on the inner wall of the charging section (16), a heat-resistant plug (18) which is movably disposed in the charging section (16) and contacts the inner wall of the graphite liner (17), a fixed seat (2) which is sealed and fixedly disposed inside the housing (1), a movable cavity (12) which is formed between the fixed seat (2) and the connecting sleeve (14), a piston cylinder (11) which is disposed in the movable cavity (12), and an opening that extends upward from the upper end of the fixed seat (2). The blind hole forms a placement cavity (6) for placing cables. The lower end is provided with an installation cavity (7) formed by a blind hole with an opening facing downwards. The installation cavity (7) is connected to the movable cavity (12). The central channel of the piston cylinder (11) is connected to the installation cavity (7). The central channel of the connecting sleeve (14) is connected to the movable cavity (12). A propulsion mechanism for pushing the piston cylinder (11) is installed in the installation cavity (7). The propulsion mechanism is connected to the cable in the placement cavity (6). A first through hole (9) is opened on the side wall of the piston cylinder (11). A second through hole (10) that cooperates with the first through hole (9) is opened on the housing (1). When the heat insulation short section is in the initial state before the cutting device cuts, the second through hole (10) is located below the first through hole (9), and the piston cylinder (11) blocks the second through hole (10). The heat-resistant plug (18) is attached to the lower end of the connecting sleeve (14) and closes the central through hole of the connecting sleeve (14). When the heat insulation short section is in the initial state before the cutting device cuts, the piston cylinder (11) is attached to the lower end of the mounting cavity (7), and the central channel of the piston cylinder (11) is partially connected to the opening of the mounting cavity (7). When the heat insulation section is in the cutting state of the cutting device, the piston cylinder (11) moves downward to connect the first through hole (9) and the second through hole (10); The heat-resistant plug (18) has a groove (15) on its upper surface to facilitate the action of high-pressure gas on the heat-resistant plug (18), and the groove (15) is located at the center of the upper surface of the heat-resistant plug (18).

2. The insulated nipple of claim 1, wherein: The two ends of the connecting sleeve (14) are fitted with a third sealing ring (13); the fixed seat (2) is fitted with a first sealing ring (4); the piston cylinder (11) is fitted with three second sealing rings (8), one of which is located between the first through hole (9) and the second through hole (10), and the first through hole (9) and the second through hole (10) are located between the other two second sealing rings (8).

3. The insulated nipple of claim 2, wherein: A screw (5) is threaded through the housing (1), and the screw (5) is located between two first sealing rings (4). The fixing seat (2) is connected to the housing (1) through the screw (5).

4. The thermal insulation section according to claim 3, characterized in that: The inner wall of the active cavity (12) is provided with an annular groove (19) for supporting the piston cylinder (11), and a second sealing ring (8) at the lowest end is provided in the annular groove (19).

5. The insulated nipple of claim 4, wherein: A sealing plug (3) is provided at the opening of the placement cavity (6) for sealing the placement cavity (6).

6. The insulated nipple of claim 5, wherein: The heat-resistant plug (18) is a graphite heat-resistant plug.

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