Novel temperature and pressure integrated transmitter screwed plug sheath

Abstract

The utility model discloses a novel temperature and pressure integrated transmitter screwed plug sheath, which comprises a pressure-resistant shell and a temperature and pressure transmitter, a connecting port is arranged at the front end of the pressure-resistant shell, and a temperature transmission mechanism and a pressure transmission mechanism are arranged in the pressure-resistant shell; and the temperature and pressure transmitter is arranged on the pressure-resistant shell and is connected with the temperature transmission mechanism and the pressure transmission mechanism. The temperature and pressure measuring device is fast to install, and can accurately measure the temperature and the pressure. Transfer liquid and heat-conducting silicone grease cannot be lost after installation, the loss is small, and the cost is saved. Transmitter replacement and maintenance operation can be achieved without well shutdown and emptying, the oil extraction efficiency is improved, and green and clean production in the oil and gas extraction process is assisted.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well wellhead data acquisition, and specifically relates to a novel temperature and pressure integrated transmitter plug sheath. Background Technique

[0002] With the advancement of informatization and intelligentization, a temperature and pressure integrated transmitter is installed at the wellhead of an oil and gas well to measure and collect the temperature and pressure of the production well. After being transmitted through the network, the production parameters of the wellhead can be remotely viewed at the production operation command center. During application, the temperature and pressure integrated transmitter needs to be installed at the wellhead through a plug sheath. The traditional plug sheath has a ring-shaped hollow inside, and the installation position is at the end of the wellhead, where the downhole produced fluid cannot flow, commonly known as the "blind gut". In addition, due to the changeable physical properties of the produced fluid such as thick oil and wax deposition, it is extremely easy to form a "dead oil area", resulting in inaccurate measurement of production data such as wellhead temperature and pressure, inability to judge and predict the production status of the oil and gas well, and seriously hindering the normal operation of oil and gas production. In order to accurately measure and collect accurate data at the production site, effectively analyze the production status of the oil and gas well, and comprehensively promote the development of the informatization process, a novel temperature and pressure integrated transmitter plug sheath for oil and gas wells has been innovatively developed.

[0003] Publication (Announcement) Number: CN212456313U discloses a quick disassembly and assembly structure for a pipeline type high-temperature resistant pressure transmitter, which relates to the field of pressure transmitters. Aiming at the problems that the existing pressure transmitter is inconvenient to disassemble and assemble when connected to the pipeline, and the installation is not stable enough, which easily leads to inaccurate pressure measurement values, the following solution is proposed. It includes a pipeline and a transmitter connecting pipe. The transmitter connecting pipe is arranged in a continuous and communicating section, and connection ports are arranged at both ends of the transmitter connecting pipe. A rubber ring is fixedly sleeved on the circumferential side wall of one end of the pipeline close to the transmitter connecting pipe. Installation blocks are fixedly connected to both the upper and lower ends of the transmitter connecting pipe, and a dial is fixedly connected to the top of the installation block located at the upper end. Adjusting rods are hinged to both sides of the installation block. The utility model has a novel structure, and this device not only facilitates the quick disassembly and assembly operation of the pressure transmitter and the pipeline, but also can improve the connection stability between the pressure transmitter and the pipeline, thereby improving the use efficiency of the pressure transmitter.

[0004] This prior art cannot achieve the replacement of the transmitter without shutting down the well, and there will be problems of shutting down the well for replacement and affecting production.

[0005] Publication (Announcement) Number: CN212462290U discloses an oil and gas well temperature and pressure integrated transmitter adapter, which includes: a temperature measuring sleeve having a temperature interface for connecting to a temperature transmitter; a pressure measuring sleeve having a pressure interface for connecting to a pressure transmitter; the pressure measuring sleeve and the temperature measuring sleeve are fixedly connected to each other. The utility model is small in volume, easy to carry, convenient to install, and can improve the accuracy of pressure and temperature transmission in oil and gas wells after use.

[0006] This prior art cannot achieve the replacement of the transmitter without shutting down the well, and there will be problems such as shutting down the well for replacement, which will affect production.

[0007] Publication (Announcement) Number: CN215718623U discloses a temperature and pressure integrated variable one-way diversion device, including a check valve and an inner pipe; the whole inner pipe is located inside the choke nipple, and the inner cavity of the inner pipe is divided into a left small-diameter pipe section and a right large-diameter pipe section, where the inlet of the left small-diameter pipe section is connected to the inlet of the choke nipple in a matching manner; the whole check valve is located inside the choke nipple, and the inlet of the check valve is connected to the right port of the right large-diameter pipe section in a matching manner. After this device is combined with a temperature and pressure integrated transmitter, it can extend the liquid flow distance, ensure that the liquid can fully contact the temperature sensing probe of the temperature and pressure integrated variable device, and melt the dead oil at the pressure joint of the temperature and pressure integrated variable. It is convenient for quick disassembly and assembly and can be reused. A check valve is installed to prevent liquid backflow.

[0008] This prior art cannot achieve replacement without shutting down the well, and there is only one channel, which cannot meet the installation of the temperature sensor and pressure sensor of the distributed temperature and pressure transmitter.

[0009] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects of the above-disclosed technologies are all different from those of the present utility model. Regarding more technical features, the technical problems to be solved, and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Summary of the Invention

[0010] Aiming at the above defects existing in the prior art, the purpose of the present utility model is to provide a new type of temperature and pressure integrated transmitter plug sheath, which can accurately measure the wellhead temperature and pressure, so as to judge and predict the production status of oil and gas wells, ensure the normal progress of oil and gas production, and comprehensively promote the process of informatization and intelligentization.

[0011] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0012] A new type of temperature and pressure integrated transmitter plug sheath includes a pressure-resistant housing and a temperature and pressure transmitter. A connection port is provided at the front end of the pressure-resistant housing, and a temperature transmission mechanism and a pressure transmission mechanism are provided in the pressure-resistant housing; the temperature and pressure transmitter is arranged on the pressure-resistant housing and is connected to the temperature transmission mechanism and the pressure transmission mechanism.

[0013] Further, a first through hole and a second through hole that penetrate the pressure-resistant housing horizontally;

[0014] Specifically, the temperature transmission mechanism is arranged in the first through hole, and the pressure transmission mechanism is arranged in the second through hole;

[0015] Specifically, the temperature and pressure transmitter is provided with a temperature measuring rod and a pressure element;

[0016] Specifically, the temperature measuring rod is arranged in the temperature transmission mechanism, and the pressure element is arranged in the pressure transmission mechanism.

[0017] Further, the temperature transmission mechanism includes a temperature measuring sleeve;

[0018] Specifically, the temperature measuring sleeve is arranged in the second through hole, the front end of the temperature measuring sleeve is closed, and the front end of the temperature measuring sleeve extends out of the connection port;

[0019] Specifically, a sealing connection plug is arranged at the rear end of the temperature measuring rod, and the sealing connection plug is connected to the rear end of the first through hole, so that the temperature measuring rod is located inside the temperature measuring sleeve, and the signal wire of the temperature measuring rod is connected to the temperature and pressure transmitter;

[0020] Specifically, the temperature measuring sleeve is filled with thermal conductive silicone grease.

[0021] Further, the pressure transmission mechanism includes a piston, a one-way joint, and a piston limiting mechanism;

[0022] Specifically, the piston is arranged at the front end inside the second through hole and can slide back and forth in the second through hole, and the piston limiting mechanism is arranged at the rear end of the second through hole;

[0023] Specifically, the pressure-resistant housing is provided with a third through hole communicating with the second through hole, and the one-way joint is arranged at the upper end of the third through hole;

[0024] Specifically, the temperature and pressure transmitter is arranged on the one-way joint, and the pressure element is located in the one-way joint, and the second through hole and the third through hole are filled with a conductive liquid.

[0025] Further, at least two piston sealing rings are evenly distributed around the piston,

[0026] Further, the piston limiting mechanism includes a lead screw and a lead screw sealing plug;

[0027] Specifically, the lead screw sealing plug is arranged at the rear end of the second through hole, the lead screw passes through the lead screw sealing plug and is threadedly connected to the lead screw sealing plug, and a limiting groove is arranged on the lead screw.

[0028] Further, at least two lead screw sealing rubber rings are arranged around the lead screw sealing plug.

[0029] Further, a spring and a one-way tube are arranged inside the one-way joint;

[0030] Specifically, the one-way tube is a stepped tube with a thinner upper part and a thicker lower part, and a tube seat is arranged inside the one-way joint;

[0031] Specifically, the small-diameter part of the one-way tube is arranged in the tube seat, the large-diameter part of the one-way tube is located below the tube seat, and the spring is arranged below the one-way tube.

[0032] Specifically, the lower end of the one-way tube is sealed, a one-way tube sealing ring is installed between the large-diameter part of the one-way tube and the tube seat, and a one-way tube hole is provided in the small-diameter part of the one-way tube.

[0033] Specifically, when the temperature and pressure transmitter is not installed, the one-way tube is pressed tightly against the tube seat by the spring, and the elastic deformation of the one-way tube sealing rubber ring is used to achieve sealing.

[0034] Specifically, after the temperature and pressure transmitter is installed, the one-way tube hole is located below the tube seat.

[0035] Furthermore, the surface of the connection port is provided with an external thread and is installed on the internal thread of the oil nozzle sleeve of the oil and gas well by means of threaded connection.

[0036] The utility model has the following beneficial effects compared with the prior art:

[0037] 1. Quick installation, capable of achieving accurate temperature measurement and accurate pressure measurement.

[0038] 2. After installation, there will be no leakage of the transfer liquid and thermal conductive grease, with small loss and cost savings.

[0039] 3. It is possible to replace and maintain the transmitter without shutting down the well and venting, improving the oil production efficiency and facilitating the green and clean production in the oil and gas production process. Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of a novel temperature and pressure integrated transmitter plug sheath of the utility model;

[0041] Figure 2 is a schematic structural diagram of a one-way joint of a novel temperature and pressure integrated transmitter plug sheath of the utility model;

[0042] In the figure: 1, pressure-resistant housing; 2, temperature measuring sleeve; 3, temperature measuring rod; 4, thermal conductive grease; 5, piston; 6, conduction liquid; 7, piston sealing rubber ring; 8, one-way joint; 9, spring; 10, one-way tube; 11, one-way tube hole; 12, conduit sealing rubber ring; 13, introduction groove; 14, temperature and pressure transmitter; 15, connection port; 16, screwing-in screw rod; 17, screwing-in screw rod sealing rubber ring; 18, limiting groove. Detailed Embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0044] Embodiment 1:

[0045] Please refer to Figures 1 to 2 , a novel temperature and pressure integrated transmitter plug sheath provided by the present utility model includes a pressure-resistant housing 1 and a temperature and pressure transmitter 14. A connection port 15 is provided at the front end of the pressure-resistant housing 1. A temperature transfer mechanism and a pressure transfer mechanism are provided in the pressure-resistant housing 1. The temperature and pressure transmitter 14 is provided on the pressure-resistant housing 1 and is connected to the temperature transfer mechanism and the pressure transfer mechanism.

[0046] The first through hole and the second through hole that penetrate the pressure-resistant housing 1 horizontally. The temperature transfer mechanism is provided in the first through hole, and the pressure transfer mechanism is provided in the second through hole. The temperature and pressure transmitter is provided with a temperature measuring rod 3 and a pressure diaphragm. The temperature measuring rod 3 is provided in the temperature transfer mechanism, and the pressure diaphragm is provided in the pressure transfer mechanism.

[0047] The temperature transfer mechanism includes a temperature measuring sleeve 2. The temperature measuring sleeve 2 is provided in the second through hole. The front end of the temperature measuring sleeve 2 is closed. The front end of the temperature measuring sleeve 2 extends out of the connection port 15. A sealing connection plug is provided at the rear end of the temperature measuring rod 3. The sealing connection plug is connected to the rear end of the first through hole, so that the temperature measuring rod 3 is located inside the temperature measuring sleeve 2. The temperature measuring sleeve 2 is filled with heat-conducting silicone grease 4. The signal wire of the temperature measuring rod 3 is connected to the temperature and pressure transmitter 14. The front end of the temperature measuring sleeve 2 is in direct contact with the produced fluid, senses the temperature of the produced fluid, and transfers the temperature to the internally installed temperature measuring rod 3 through the heat-conducting silicone grease 4. The temperature measuring rod 3 transfers the temperature to the temperature and pressure integrated transmitter, thereby displaying the temperature of the produced fluid.

[0048] The pressure transfer mechanism includes a piston 5, a one-way joint 8, and a piston limiting mechanism. The piston 5 is provided at the front end inside the second through hole and can slide back and forth in the second through hole. At least two piston sealing rings 7 are evenly distributed around the piston 5. The piston limiting mechanism is provided at the rear end of the second through hole. The pressure-resistant housing 1 is provided with a third through hole communicating with the second through hole. The one-way joint 8 is provided at the upper end of the third through hole. The temperature and pressure transmitter 14 is provided on the one-way joint 8, and the pressure diaphragm is located in the one-way joint 8. The second through hole and the third through hole are filled with a conductive liquid 6.

[0049] The piston 5 serves to transmit the pressure of the produced fluid. The piston seal ring 7 can seal the gap between the produced substance and the conductive fluid 6, serving to isolate the intercommunication of the two fluids and provide sealing. The conductive fluid 6 can sense the pushing pressure of the piston and transmit the pressure to the one-way joint 8.

[0050] The piston limiting mechanism includes a lead screw 16 and a lead screw seal plug 18. The lead screw seal plug 18 is arranged at the rear end of the second through hole. The lead screw 16 passes through the lead screw seal plug 18 and is threadedly connected to the lead screw seal plug 18. A limiting groove is provided on the lead screw 16 to facilitate reminding of the opening position. At least two lead screw seal rubber rings 17 are arranged around the lead screw seal plug 18 to prevent the leakage of the conductive fluid 6.

[0051] Inside the one-way joint 8, there are a spring 9 and a one-way tube 10. The one-way tube 10 is a stepped tube with a smaller diameter at the top and a larger diameter at the bottom. A tube seat 13 is arranged inside the one-way joint 8. The smaller-diameter part of the one-way tube 10 is arranged in the tube seat 13, and the larger-diameter part of the one-way tube 10 is located below the tube seat 13. The spring 9 is arranged below the one-way tube 10. The lower end of the one-way tube 10 is sealed. A one-way tube seal ring 12 is installed between the larger-diameter part of the one-way tube 10 and the tube seat 13. When the temperature and pressure transmitter 14 is not installed, the one-way tube 10 is pressed tightly against the tube seat 13 by the spring 9, and sealing is achieved through the elastic deformation of the one-way tube seal rubber ring 12. A one-way tube hole 11 is provided in the smaller-diameter part of the one-way tube 10. After the temperature and pressure transmitter is installed, the one-way tube hole 11 is located below the tube seat 13, and the pressure of the conductive fluid can be transmitted to the upper temperature and pressure transmitter 14. The pressure diaphragm of the temperature and pressure transmitter 14 senses the pressure of the conductive fluid and displays the measured pressure value.

[0052] The pressure-resistant housing 1 is processed and customized according to different service pressure conditions.

[0053] The surface of the connection port 15 has an external thread and can be installed on the internal thread of the oil nozzle sleeve of the oil and gas well by means of threaded connection, serving to support and fix the plug sheath.

[0054] It should be noted that the temperature and pressure transmitter 14 is a prior art and can be purchased and used in the market. Those skilled in the art are clear about this.

[0055] Embodiment 2:

[0056] This embodiment provides a method for using the device:

[0057] S1. The plug sheath is installed on the wellhead oil nozzle sleeve by means of threaded connection through the connection port 15;

[0058] S2. When the wellhead produced fluid contacts the plug sheath, the temperature measuring sleeve 2 directly contacts the produced fluid to sense its temperature. The temperature is transmitted to the temperature measuring rod 3 through the thermal conductive silicone grease 4 inside the temperature measuring sleeve. After the temperature measuring rod 3 measures the temperature value, it transmits the temperature value to the temperature and pressure transmitter 14, and the temperature of the produced fluid is displayed on the temperature and pressure transmitter 14 to achieve accurate temperature measurement.

[0059] S3. Above the connection port is installed a piston 5, and three piston sealing rubber rings 7 are evenly distributed on the piston 5. The outer diameter of the piston sealing rubber ring 7 is larger than that of the piston 5, and it is deformed by extrusion to prevent the produced fluid from leaking. At the rear end of the piston 5 is the conductive fluid 6. After the conductive fluid 6 senses the thrust of the produced fluid pushing the piston, the conductive fluid is introduced into the pressure measuring element 0 of the temperature and pressure transmitter 14 through the one-way joint 8. After the pressure measuring element senses the pressure, it measures the pressure value and displays the pressure on the temperature and pressure transmitter 14 to achieve accurate pressure measurement.

[0060] Embodiment 3:

[0061] This embodiment provides a method for replacing the temperature and pressure transmitter 14 without shutting down the well:

[0062] A1. Open and close the pressure transmission mechanism.

[0063] Close the pressure transmission mechanism. By rotating the screw rod 16 into it, when the screw rod 16 abuts against the piston 5, the pressure of the produced fluid pushing the piston 5 is borne by the screw rod 16. At this time, the conductive fluid 6 will not transmit the thrust of the piston 5 anymore, and the pressure of the temperature and pressure transmitter 14 drops to zero, and the transmitter 14 can be unscrewed for replacement operation.

[0064] Open the pressure transmission mechanism. When the new temperature and pressure transmitter 14 is screwed in and automatically turned on and conducted, rotate the screw rod 16 into it in the reverse direction. At this time, a gap is generated between the screw rod 16 and the piston 5, and the thrust of the piston 5 is conducted to the temperature and pressure transmitter 14 by the conductive fluid 6, and normal pressure measurement is restored.

[0065] There is also a limit groove 18 engraved on the screw rod 16 to remind the operator of the opening degree of the screw rod screwed in.

[0066] A2. Replace the temperature and pressure transmitter 14.

[0067] When the temperature and pressure transmitter 14 is unscrewed, the spring 9 presses the single-flow tube 10 tightly on the tube seat 13. Through the elastic deformation of the single-flow tube sealing rubber ring 12, the leakage of the conductive fluid 6 is prevented to achieve self-sealing.

[0068] When the temperature and pressure transmitter 14 is screwed in, the temperature and pressure transmitter 14 presses the single-flow tube 10, and presses the single-flow tube hole 11 under the tube seat 13. At this time, the conductive fluid 6 is introduced into the pressure measuring element of the temperature and pressure transmitter 14 through the diversion hole 11, realizing self-sealing when the temperature and pressure transmitter is unscrewed and self-opening and conduction when it is screwed in.

[0069] It has never been possible to replace and maintain the transmitter without shutting down the well and venting, which improves the oil production efficiency and contributes to the green and clean production in the oil and gas production process.

[0070] In this application, all components that are not elaborated and the connection methods of various components in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0071] In this utility model, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0072] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0073] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0074] The above is only the preferred embodiment of this utility model and is not used to limit this utility model. For those skilled in the art, this utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this utility model shall be included within the protection scope of this utility model.

Claims

1. A novel temperature and pressure integrated transmitter plug sheath, comprising a pressure-resistant housing and a temperature and pressure transmitter, wherein a connection port is arranged at the front end of the pressure-resistant housing, characterized in that: The pressure-resistant shell is provided with a temperature transmission mechanism and a pressure transmission mechanism; The temperature and pressure transmitter is arranged on the pressure-resistant housing and is connected with the temperature transmission mechanism and the pressure transmission mechanism.

2. According to claim 1, the new temperature and pressure integrated transmitter plug sheath is characterized in that: A first through hole and a second through hole that are transversely passed through the pressure-resistant shell; The temperature transmission mechanism is arranged in the first through hole, and the pressure transmission mechanism is arranged in the second through hole; The temperature and pressure transmitter is provided with a temperature measuring rod and a pressure element; The temperature measuring rod is arranged in the temperature transmission mechanism, and the pressure element is arranged in the pressure transmission mechanism.

3. The novel temperature and pressure integrated transmitter plug sheath according to claim 2 is characterized in that: The temperature transfer mechanism includes a temperature measuring sleeve; The temperature measuring sleeve is arranged in the second through hole, the front end of the temperature measuring sleeve is closed, and the front end of the temperature measuring sleeve extends out of the connection port; The rear end of the temperature measuring rod is provided with a sealing connection plug, and the sealing connection plug is connected to the rear end of the first through hole, so that the temperature measuring rod is located in the temperature measuring sleeve, and the temperature measuring rod signal line is connected to the temperature and pressure transmitter; The temperature measuring sleeve is filled with thermal conductive silicone grease.

4. The novel temperature and pressure integrated transmitter plug sheath according to claim 2 is characterized in that: The pressure transmission mechanism includes a piston, a single-flow joint, and a piston limiting mechanism; The piston is arranged at the front end of the second through hole and can slide back and forth in the second through hole, and the piston limiting mechanism is arranged at the rear end of the second through hole; The pressure-resistant shell is provided with a third through hole communicating with the second through hole, and the single-flow joint is provided at an upper end of the third through hole; The temperature and pressure transmitter is arranged on the single-flow joint, and the pressure element is located in the single-flow joint. The second through hole and the third through hole are filled with conducting liquid.

5. The novel temperature and pressure integrated transmitter plug sheath according to claim 4 is characterized in that: At least two piston sealing rings are evenly distributed around the piston.

6. The novel temperature and pressure integrated transmitter plug sheath according to claim 4 is characterized in that: The piston limiting mechanism includes a lead screw and a lead screw sealing plug; The screw sealing plug is arranged at the rear end of the second through hole, the screw passes through the screw sealing plug and is threadedly connected with the screw sealing plug, and a limiting groove is arranged on the screw.

7. The novel temperature and pressure integrated transmitter plug sheath according to claim 6 is characterized in that: At least two screw sealing rubber rings are arranged around the screw sealing plug.

8. The novel temperature and pressure integrated transmitter plug sheath according to claim 4 is characterized in that: The single-flow joint is provided with a spring and a single-flow tube inside; The single-flow pipe is a reducer that is thin at the top and thick at the bottom, and a pipe seat is provided in the single-flow joint; The small diameter portion of the single flow tube is arranged in the tube seat, the large diameter portion of the single flow tube is located below the tube seat, and the spring is arranged below the single flow tube; The lower end of the single flow tube is sealed, a single flow tube sealing ring is installed between the large diameter portion of the single flow tube and the tube seat, and a single flow tube hole is set in the small diameter portion of the single flow tube; When the temperature and pressure transmitter is not installed, the single flow tube is pressed against the tube seat by a spring, and the sealing is achieved by the elastic deformation of the sealing rubber ring of the single flow tube; After the temperature and pressure transmitter is installed, the single flow pipe hole is located below the pipe seat.

9. A novel temperature and pressure integrated transmitter plug sheath according to any one of claims 1 to 8, characterized in that: The surface of the connection port is provided with external threads, and is installed on the internal threads of the nozzle sleeve of the oil and gas well by means of threaded connection.

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