Novel blowout prevention meter reading plug valve for well drilling and workover pipe column

Abstract

The utility model relates to a novel blowout prevention and meter reading plug valve for a well drilling and workover pipe column, which comprises a plug valve body, a plug valve core and two limiting steering blocks, and the plug valve core is arranged below an upper valve seat in threaded connection with the plug valve body through the two limiting steering blocks; a meter reading pressure relief joint which is communicated with a central hole of the plug valve body and is provided with a one-way valve core is arranged in a lower body of the plug valve body; the meter reading pressure relief connector can be connected with a pressure meter or a pressure relief needle valve through a tenon and is used for reading the pressure in the construction pipe column or relieving the pressure of the construction pipe column. The plug valve is simple in structure, safe and reliable in work, capable of using multiple auxiliary tools during mounting and dismounting, simple, convenient and rapid to dismount and mount, and convenient to operate. While safe and reliable work of the plug valve is ensured, multiple functions are achieved, the labor intensity of workers is effectively reduced, and the construction efficiency is effectively improved. And the blowout wrecking time efficiency of a blowout well is improved, the blowout prevention effect of the plug valve is effectively improved, the remarkable using effect is achieved, and good economic benefits can be generated.

Description

Technical Field

[0001] This utility model relates to a blowout preventer device in the drilling and workover string of the petroleum industry, and in particular to a novel plug valve for reading the blowout preventer gauge in the drilling and workover string. Background Technology

[0002] With the expansion and development of offshore oil fields, the intensity of offshore production capacity development has been increasing year by year, leading to a growing workload of offshore drilling and workover operations, and a corresponding increase in the number of wells drilled and worked over annually. Drilling and workover operations involve all layers of offshore oil and gas reservoirs. In recent years, to protect the environment, safety and environmental protection requirements have become increasingly stringent, and laws and regulations governing offshore well control have become increasingly comprehensive and stringent. For example, during downtime in drilling and workover operations, such as running in and out of tubing and filling fluids, a stopcock valve is required to be installed at the coupling at the upper end of the tubing string. This necessitates closing the hydraulic gate blowout preventer and installing a pressure gauge seat and pressure gauge at the upper end of the stopcock valve body, increasing the construction procedures and operations. Furthermore, pressure must be recorded, the pressure gauge seat's release screw loosened, and the pressure gauge seat disassembled before removing the pressure gauge; these operations are cumbersome and time-consuming.

[0003] During well workover operations, if overflow occurs at the wellhead, a plug valve must be installed at the coupling at the upper end of the work string. At this time, the hydraulic gate blowout preventer or hydraulic annular blowout preventer must be closed before closing the wellhead plug valve.

[0004] Traditional plug valves are operated by inserting a wrench into a limiting knob on one side of the valve body. Turning the valve core closes the internal circulation channel in the well tubing. After connecting the construction pipeline to the upper part of the plug valve, the wrench is then inserted back into the limiting knob on the valve body, and the valve core is rotated in the opposite direction to open the internal circulation channel in the well tubing. However, if there is pressure in the internal circulation channel pushing against the valve core, the rotational friction of the valve core increases, making it difficult to operate. The traditional method involves using a lever attached to the wrench. If the well pressure is high and the rotational friction of the valve core continues to increase, the torque of the lever may not be sufficient to overcome the high friction, thus failing to open the fluid flow channel. Over time, the well pressure continues to increase, and the risk of a blowout becomes apparent. At this point, attempting to open the plug valve with the lever also has drawbacks such as the inability to determine the well pressure value and impacting subsequent well control operations.

[0005] To address the above problems, the following related patented technologies have emerged:

[0006] Patent application CN201720854990.4 discloses a low-torque plug valve and an internal anti-spray device, comprising an upper valve seat, a lower valve seat, and a valve plug located between the two in the valve body. The upper valve seat, the lower valve seat, and the valve plug are all provided with internal through holes for fluid passage that are connected in sequence. The valve plug is rotatably connected to the upper valve seat and the lower valve seat. An external valve stem extending out of the valve body is connected to the valve plug, and the valve plug is driven to rotate by the external valve stem. A spring is provided between the valve body and the upper valve seat and / or the lower valve seat, and the extension direction of the spring is consistent with the extension direction of the internal through hole.

[0007] While the aforementioned inventions reduce the opening torque of the plug valve, they cannot relieve pressure in the tubing below the valve seat, nor can they easily read the pressure in the tubing below the valve seat. Therefore, they cannot meet the technical requirements of offshore and onshore well control and daily production.

[0008] Patent application CN200720081563.3 discloses a dual-knob plug valve for drilling blowout prevention, comprising a valve body, an upper valve seat, a lower valve seat, a dual-knob valve core, a main knob, and an auxiliary knob. The main knob and the auxiliary knob are connected by a dual-knob valve core; the main knob and the auxiliary knob have identical structures, located on corresponding sides of the plug valve housing, with their center lines on the same axis. When the main knob's closing torque is insufficient or the main knob fails, the auxiliary knob can be used to open or close the plug valve together, reducing the torque transmitted by a single knob and overcoming the risks caused by insufficient opening / closing torque or failure of a single knob.

[0009] While the aforementioned inventions reduce the opening torque of the plug valve, they cannot relieve pressure in the tubing below the valve seat, nor can they easily read the pressure in the tubing below the valve seat. Therefore, they cannot meet the technical requirements of offshore and onshore well control and daily production.

[0010] Patent application CN201620993852.X discloses a novel anti-blowout plug valve for oil pipes, comprising an upper connector installed inside one end of a valve body; a spherical plug disposed in the inner cavity of the valve body; the upper end of the spherical plug being connected to a wrench via a steering block; an upper valve seat and a lower valve seat located on both sides of the spherical plug within the valve body, wherein the upper and lower valve seats are spherically fitted with the spherical plug; annular grooves are formed on the contact surfaces of the upper and lower valve seats with the spherical plug; a composite sealing ring is disposed within the annular groove; a wave spring is disposed between the right side of the lower valve seat and the valve body; and an upper retaining ring is disposed on the left side of the upper valve seat, wherein the upper retaining ring is disposed within the valve body via a retaining ring through a hole.

[0011] While the aforementioned inventions reduce the opening torque of the plug valve, they cannot relieve pressure in the tubing below the valve seat, nor can they easily read the pressure in the tubing below the valve seat. Therefore, they cannot meet the technical requirements of offshore and onshore well control and daily production.

[0012] In summary, existing plug valves cannot relieve pressure within the tubing below the valve seat and cannot easily read the pressure in the tubing below the valve seat. Traditional plug valves are difficult to open under high pressure, and because there is only one switching component in the valve core, if the switching component happens to be located in the position of other equipment installed at the wellhead after the plug valve body is tightened, the operating position is restricted, making the opening and closing of the plug valve core difficult. The upper part of the plug valve requires the installation of a pressure gauge seat and a shock-resistant pressure gauge for recording pressure data, and the connection parts need to be sealed, resulting in low installation efficiency and the risk of leakage. The problem of pressure relief within the tubing is not effectively solved by plug valves.

[0013] Therefore, there is a need to invent a wellhead plug valve with a simple structure that can release well pressure and reduce valve core friction when the plug valve is closed, making it easy and effortless to open the valve core. It is also convenient for daily use and can read well pressure without the need for frequent and cumbersome installation and disassembly of pressure gauges and pressure gauge seats. Summary of the Invention

[0014] The purpose of this invention is to provide a novel plug valve for reading pressure gauges in drilling and workover tubing. This valve facilitates operation, reduces valve core friction, and allows for easy opening and closing of the plug valve. It also solves the problem of pressure relief within the lower workover tubing caused by the plug valve, and addresses the inconvenience of disassembling and reading pressure gauges. This facilitates drilling and workover operations, improves work efficiency, and reduces the labor intensity of workers.

[0015] The technical solution of this utility model is: a novel plug valve for reading pressure gauges in drilling and workover tubing, comprising a plug valve body, a plug valve core, and limiting and steering blocks, wherein: the plug valve core is installed below the upper valve seat threadedly connected to the plug valve body via two limiting and steering blocks; a pressure relief connector for reading pressure gauges and having a one-way valve core is installed in the lower part of the plug valve body, communicating with the central hole of the plug valve body; the pressure relief connector for reading pressure gauges or pressure relief needle valves can be connected to pressure gauges or pressure relief needle valves via latches, and is used to read the pressure in the workover tubing or to relieve pressure in the workover tubing.

[0016] Preferably, the inner circle of the plug valve body is a non-uniform diameter inner circle, and from top to bottom, it consists of a blowout preventer connection cavity, an upper valve seat connection cavity, a lower valve seat, a central hole, and a drainage cavity; a limiting steering block mounting hole is provided in the body wall between the upper valve seat connection cavity and the lower valve seat; internal threads are provided in both the blowout preventer connection cavity and the upper valve seat connection cavity of the plug valve body, and external threads are provided on the outer circle of the plug valve body at the drainage cavity; the external threads in the blowout preventer connection cavity and the drainage cavity of the plug valve body can be threaded to the kill line and the tubing coupling, respectively; the internal thread in the upper valve seat connection cavity is an airtight thread.

[0017] Preferably, the outer circle of the plug valve body is a non-uniform diameter outer circle, and the outer diameter of the lower part connected to the oil pipe coupling is smaller than the outer diameter of the upper part. Two or more force rod insertion holes are provided on the outer circle below the anti-blowout component connecting cavity. The limit steering block mounting holes are symmetrically arranged on both sides of the plug valve body between the upper valve seat connecting cavity and the lower valve seat. Both limit steering block mounting holes are stepped holes with a smaller outer diameter and a larger inner diameter.

[0018] Preferably, the two limiting steering blocks are installed facing each other and symmetrically in the limiting steering block mounting holes and connected to the plug valve core.

[0019] Preferably, one end of each of the two limiting steering blocks has a stepped outer circle corresponding to the mounting hole of the limiting steering block, and an inner rotating square is provided at the outer end of the stepped outer circle; the other end of each of the two limiting steering blocks has a square block that mates with the connecting groove of the plug valve core; the square blocks in the two limiting steering blocks are connected to each other in the connecting groove of the plug valve core, and a sealing ring is provided between the square blocks in the two limiting steering blocks and the connecting groove of the plug valve core.

[0020] Preferably, a rotating square is provided on the outer circumference of the plug valve body below the mounting hole of the limit steering block, and the reading pressure relief connector is installed in the quick connector connection hole in the plug valve body below the rotating square.

[0021] Preferably, the quick connector connection hole is a convex U-shaped hole with a smaller inner diameter and a larger outer diameter, and the internal thread in the smaller diameter hole can be threadedly connected to the pressure relief connector of the reading instrument; the pressure gauge connector or the body of the pressure relief needle valve can be installed in the larger diameter hole on the outer side of the quick connector connection hole, which is connected to the connecting tenon in the pressure relief connector of the reading instrument; the pressure relief connector of the reading instrument is a high-pressure self-locking quick connector.

[0022] Preferably, the lower valve seat is an arc-shaped inner cavity located below the mounting hole of the limiting steering block and around the central hole of the plug valve body; the upper valve seat is a tubular body with an arc-shaped inner cavity at the bottom and external threads at the top, and the central hole of the upper valve seat is larger than the central hole of the plug valve body, and an anti-corrosion layer is provided on the outer surface of the arc-shaped inner cavity at the bottom of the upper valve seat; the arc-shaped inner cavities of the upper and lower valve seats both conform to the shape of the plug valve core.

[0023] Preferably, the stopcock valve core is a spherical body with a central hole for liquid flow, and the connecting groove is provided on both sides of the spherical body of the stopcock valve core and is a through groove perpendicular to the central hole for liquid flow.

[0024] Preferably, the inner diameter of the liquid flow center hole in the plug valve core is smaller than the inner diameter of the upper valve seat and the same as the diameter of the center hole below the lower valve seat in the plug valve body.

[0025] Compared with the prior art, the significant effects of this utility model are as follows: 1. It increases the number of limiting and steering blocks of the switch plug valve core. Two limiting and steering blocks can be used at the same time, which can further reduce the friction of the switch valve core rotation and facilitate the operation of the switch plug valve by construction personnel.

[0026] 2. By increasing the number of limit and steering blocks, which is equivalent to increasing the number of switching components of the plug valve core, it is ensured that at least one limit and steering block is located in a convenient operating position, thus solving the defect of limited operating position of the existing plug valve.

[0027] 3. An additional insertion hole for the lever has been added, allowing for the insertion of two or more levers, which facilitates the installation and construction of the plug valve at the wellhead by construction personnel. The lever can also be used simultaneously with auxiliary tools used on the outside of the rotating part.

[0028] 4. Most importantly, a pressure relief connector has been added, and this connector uses a high-pressure self-locking quick connector. Without changing the inner diameter of the plug valve, a pressure gauge can be installed under pressure to record the pressure in the tubing string while the plug valve core is closed. Alternatively, a pressure relief needle valve and pressure relief line can be installed under pressure in the pressure relief connector. The pressure relief needle valve can be used to reduce part of the pressure in the construction tubing string first, which is more conducive to opening the plug valve core and facilitates the next step of well control operation, thus gaining time for emergency blowout and providing the prerequisites.

[0029] This plug valve has a simple structure and is safe and reliable in operation. It is easy to install and disassemble using various auxiliary tools, and the operator's control over the valve core is unrestricted. Furthermore, there is no need to frequently install and remove pressure gauges and gauge seats at the top of the valve body; simply connect the pressure gauge to the pressure relief connector via a pressure gauge connector.

[0030] After installing a pressure gauge in the pressure relief connector, the pressure inside the construction tubing can be read. Pressure can be released with the plug valve closed, reducing friction when opening the valve core. It can also be connected to a pressure relief needle valve at this point, greatly facilitating use and operation. While ensuring the safe and reliable operation of the plug valve, it achieves multiple functions, effectively reducing the labor intensity of workers and improving construction efficiency. It improves the timeliness of emergency blowout control in blowout-prone wells, effectively enhances the blowout prevention effect of the plug valve, and has significant practical benefits, generating substantial economic returns. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 yes Figure 1 Enlarged structural diagram of the pressure relief connector for the reading meter.

[0033] In the diagram: 1. Plug valve body; 1-1. Rotary force rod insertion hole; 2. Upper valve seat; 3. Plug valve core; 4. Limiting and steering block; 5. Reading and pressure relief connector; 51. Connector body; 52. Spring; 53. One-way valve core; 54. Spring seat; 55. Connecting latch; 6. Lower valve seat; 7. Rotating square. Detailed Implementation

[0034] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] See Figure 1 and Figure 2 A novel plug valve for reading pressure gauges in drilling and workover tubing includes a plug valve body 1, a plug valve core 3, and limiting and steering blocks 4. The plug valve core 3 is installed below the upper valve seat 2, which is threadedly connected to the plug valve body 1, via two limiting and steering blocks 4. A pressure relief connector 5, which communicates with the central hole of the plug valve body 1 and is equipped with a one-way valve core 53, is installed in the lower part of the plug valve body 1. The pressure relief connector 5 can be connected to a pressure gauge or a pressure relief needle valve via a latch 55 and is used to read the pressure in the workover tubing or to relieve pressure in the workover tubing.

[0038] In this invention, two limit steering blocks 4 are connected to the plug valve core 3, making it easier to open and close the plug valve, while not being restricted by the switch operation position.

[0039] The key feature of this invention is the installation of a pressure relief connector 5 with a one-way valve core 53 in the valve body 1, which communicates with its central hole. This design offers the following significant advantages:

[0040] 1. After connecting the pressure gauge to the pressure relief connector 5, the pressure gauge pushes the one-way valve core 53 inward, allowing the fluid in the construction tubing to flow out through the fluid orifice in the spring seat 54, making it easy to read the pressure in the tubing. Connecting the pressure relief connector 5 to the pressure gauge or pressure relief needle valve via the locking clip 55 makes connection and disassembly convenient and quick, greatly simplifying the current use and operation procedures of pressure gauges, facilitating on-site construction, reducing the labor intensity of workers, and improving construction efficiency.

[0041] 2. After connecting the pressure relief connector 5 to the pressure relief needle valve, part of the pressure inside the work string can be easily released through the one-way valve core 53 and the pressure relief needle valve. This not only facilitates the reading of the pressure gauge but also further facilitates the opening of the plug valve core 3, providing convenience for the next step of well control operations. The cooperation between the pressure relief connector 5 and the pressure relief needle valve makes the blowout prevention operation of the plug valve with blowout prevention function convenient and quick. Its blowout prevention function is safe and reliable, completely solving the problem of pressure relief inside the drilling and workover string.

[0042] Based on the above embodiment one, the present invention also has the following embodiments:

[0043] In a preferred embodiment: the inner circle of the plug valve body 1 is a non-uniform diameter inner circle, and from top to bottom, it consists of a blowout preventer connection cavity, an upper valve seat connection cavity, a lower valve seat 6, a central hole, and a drainage cavity; a limiting steering block mounting hole is provided in the body wall between the upper valve seat connection cavity and the lower valve seat 6; internal threads are provided in both the blowout preventer connection cavity and the upper valve seat connection cavity of the plug valve body 1, and external threads are provided on the outer circle of the plug valve body 1 at the drainage cavity; the external threads in the blowout preventer connection cavity and the drainage cavity of the plug valve body 1 can be connected to the kill line and the tubing coupling thread, respectively. The blowout preventer connection cavity at the upper end of the plug valve body 1 is provided with a female thread conforming to API standards, which can be connected to the pressure relief line and, through its threads, to the male thread of the tubing or other tools; the internal thread in the upper valve seat connection cavity is an airtight thread, which can better improve its sealing performance.

[0044] In a preferred embodiment: the outer circumference of the plug valve body 1 is a non-uniform diameter outer circumference, and the outer diameter of the lower part connected to the oil pipe coupling is smaller than the outer diameter of the upper part. Two or more extension rod insertion holes 1-1 are provided on the outer circumference below the blowout preventer component connecting cavity. The limiting steering block mounting holes are symmetrically arranged on both sides of the plug valve body 1 between the upper valve seat connecting cavity and the lower valve seat 6. Both limiting steering block mounting holes are stepped holes with a smaller outer diameter and a larger inner diameter. This allows for the installation and limiting of the limiting steering block 4 installed therein. An extension rod can be inserted into the extension rod insertion hole 1-1 to rotate the plug valve body 1, making its installation and disassembly more convenient.

[0045] In a preferred embodiment, two of the limiting steering blocks 4 are installed facing each other and symmetrically in the limiting steering block mounting holes and connected to the plug valve core 3.

[0046] In a preferred embodiment: one end of each of the two limiting steering blocks 4 has a stepped outer circle corresponding to the mounting hole of the limiting steering block, and an inner rotating square is provided at the outer end of the stepped outer circle; the other end of each of the two limiting steering blocks 4 has a square block-shaped body that mates with the connecting groove of the plug valve core 3; the square blocks in the two limiting steering blocks 4 are connected to each other in the connecting groove of the plug valve core 3, and a sealing ring is provided between the square blocks in the two limiting steering blocks 4 and the connecting groove of the plug valve core 3. Using a square block-shaped body in the limiting steering block 4 to connect with the connecting groove of the plug valve core 3 can solve the inconvenience caused by the current use of a hexagonal block to connect the valve core of the plug valve to the limiting steering block 4, such as the difficulty in determining whether the valve core is in the correct position and the inconvenience of connecting the hexagonal block to the valve core.

[0047] In a preferred embodiment, a rotating square 7 is provided on the outer circumference of the stop valve body 1 below the mounting hole of the limit steering block. The pressure relief connector 5 is installed in the quick connector connection hole in the stop valve body 1 below the rotating square 7. The rotating square 7 can be square, hexagonal, or octagonal, and the stop valve body 1 can be rotated using a wrench or pipe wrench, providing multiple ways to disassemble and assemble the rotating stop valve body 1.

[0048] In a preferred embodiment: the quick-connector connection hole is a convex U-shaped hole with a smaller inner diameter and a larger outer diameter, and the internal thread in the smaller diameter hole can be threadedly connected to the pressure relief connector 5; the pressure gauge connector or the body of the pressure relief needle valve connected to the connecting tenon 55 in the pressure relief connector 5 can be installed in the larger diameter hole on the outer side of the quick-connector connection hole; the pressure gauge connector 5 is a high-pressure self-locking quick-connector. The pressure gauge is connected to the connecting tenon 55 through the pressure gauge connector, which is a female connector with an inner connecting cavity, and the lower body of the pressure relief needle valve has an inner connecting cavity.

[0049] In a preferred embodiment: the lower valve seat 6 is an arc-shaped inner cavity located below the mounting hole of the limit steering block and around the central hole of the plug valve body 1; the upper valve seat 2 is a tubular body with an arc-shaped inner cavity at the bottom and external threads at the top, and the central hole of the upper valve seat 2 is larger than the central hole of the plug valve body 1; the arc-shaped inner cavities of the upper valve seat 2 and the lower valve seat 6 are both consistent with the shape of the plug valve core 3, and the arc surface in the lower arc-shaped inner cavity of the upper valve seat 2 is provided with an anti-corrosion layer, which has anti-corrosion and impact-resistant properties while maintaining a certain smoothness.

[0050] In a preferred embodiment, the stopcock valve core 3 is a spherical body with a central flow hole. The connecting groove is located on both sides of the spherical body and is a through groove perpendicular to the central flow hole. Thus, the end of the limiting steering block 4 with a stepped outer circle can be first installed in the stopcock valve body 1. Then, the connecting groove of the stopcock valve core 3 is aligned with the square block at one end of the limiting steering block 4 and inserted together. Finally, the upper valve seat 2 is threaded onto the top of the stopcock valve core 3. The limiting steering block 4 can be rotated using an external wrench that cooperates with the inner rotating part of the limiting steering block 4, thereby achieving the purpose of opening and closing the stopcock valve core 3. In this invention, the stopcock valve core 3 and the arc-shaped inner cavity of the upper valve seat 2 cooperate to form a sealing pair. The stopcock valve core 3 and the limiting steering block 4 are connected through the square block, making the connection more reliable. Furthermore, a high-pressure-resistant sealing ring is used at the connection point to ensure its sealing performance. The pressure relief connector 5 is a high-pressure self-locking quick connector. High-pressure self-locking quick connectors, pressure gauge connectors, and pressure relief needle valves are all existing technologies. The pressure relief connector 5 also includes a connector body 51, a spring 52, and a spring seat 54. The spring 52 is installed between the conical sealing head of the one-way valve core 53 and the spring seat 54. The conical sealing head of the one-way valve core 53 mates with the conical hole in the connector body 51 to achieve a good seal. The locking tenon 55 can engage with the connecting groove in the pressure gauge connector and the connecting groove in the inner connecting cavity of the pressure relief needle valve to achieve a quick connection. Its operation is convenient and quick, making the installation and disassembly of the pressure gauge and pressure relief needle valve simple and easy, greatly improving work efficiency and reducing the labor intensity of employees.

[0051] In a preferred embodiment, the inner diameter of the liquid flow center hole in the plug valve core 3 is smaller than the inner diameter of the upper valve seat 2 and the same as the diameter of the center hole below the lower valve seat 6 in the plug valve body 1. This invention achieves multiple functions without changing the original inner diameter of the plug valve. The plug valve core 3 adopts a spherical structure with a liquid flow center hole, the size of which is consistent with the size of the lower center hole of the plug valve body 1, thus not producing a throttling effect.

[0052] Specific usage method of this utility model:

[0053] 1. In this utility model, a pressure gauge is installed to measure pressure.

[0054] In daily construction, this utility model is placed in an easily accessible location. When a stoppage is required during work breaks such as raising or lowering the construction tubing or filling fluid, and a stop valve needs to be installed at the coupling at the upper end of the construction tubing, the hydraulic gate blowout preventer at the wellhead is closed, and this stop valve is installed on the coupling at the upper end of the tubing. A lever is inserted into the lever insertion hole 1-1 to rotate the stop valve body 1, and / or an open-end wrench or pipe wrench is used to grip the rotating square 7 in the stop valve body 1 to tighten the stop valve. An external wrench is then inserted to limit the rotation. Rotate the stopcock valve core 3 to the closed position inside block 4. Auxiliary tools can be used simultaneously in the force bar insertion hole 1-1 and the rotating side 7. Connect the pressure gauge to the pressure gauge connector, and connect the female end of the pressure gauge connector to the reading pressure relief connector 5 to apply pressure. The connection is completed through the locking tenon 55. Observe the pressure inside the construction pipeline. When the pressure inside the pipeline is observed, lift the female end of the pressure gauge connector to remove the pressure gauge. Under the action of the spring 52, the reading pressure relief connector 5 resets the one-way valve core 53 to complete the seal.

[0055] 2. Disassembly of this plug valve

[0056] When there is no pressure in the well construction string, an external wrench can be inserted into the inner hole of the limiting steering block 4 to rotate the plug valve core 3 to the open position; the plug valve can be loosened by inserting the lever into the lever insertion hole 1-1 and rotating it, or by using an open wrench or pipe wrench to bite the rotating side 7 on the outer wall of the plug valve body 1; after removing the plug valve, place it in a position that is easy to pick up and put down to complete the construction.

[0057] 3. Install this plug valve to prevent well blowout.

[0058] If overflow occurs at the wellhead, install this plug valve on the coupling at the upper end of the construction tubing string, insert the lever into the lever insertion hole 1-1 and tighten it by rotating, or use an open-end wrench or pipe wrench to grip the rotating side 7 on the outer wall of the plug valve body 1 and tighten it by rotating. Auxiliary tools can be used simultaneously on the lever insertion hole 1-1 and the rotating side 7. Use an external wrench to insert into the inner hole in the limit steering block 4 and rotate the plug valve core 3 to the closed position to close the hydraulic gate blowout preventer or the hydraulic annular blowout preventer. Thread the kill line into the blowout preventer connection cavity at the upper part of this plug valve, remove the connected pressure gauge, align the female end of the pressure gauge connector with the locking tenon 55 in the pressure relief connector 5 to pressurize and complete the connection, and observe the pressure. Use an external wrench to insert into the limit steering block 4 and rotate the plug valve core 3 to the closed position. Turn to the open position to carry out well control operations; if the pressure inside the construction tubing is too high and it is difficult to open the limit swivel block 4, lift the pressure gauge connector, remove the pressure gauge, and the reading pressure relief connector 5 will reset the one-way valve core 53 under the force of the spring 52 to complete the seal; use the pressure relief needle valve connected to the pressure relief pipeline to connect with the reading pressure relief connector 5 and complete the connection, open the pressure relief needle valve to release pressure, and at the same time use the outer square wrench to insert into the limit swivel block 4 to rotate the plug core 3 to the open position to carry out well control; after the well control is completed, insert the force rod into the rotating force rod insertion hole 1-1 to rotate the plug valve body 1, and or use an open wrench or pipe wrench to bite the rotating square 7 in the outer wall of the plug valve body 1 to rotate and loosen the plug valve body 1, remove the plug valve, and place this utility model in a position that is easy to pick up and put down to complete the construction.

[0059] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention 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 inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing, comprising a plug valve body, a plug valve core, and a limiting and steering block, characterized in that: The plug valve core is installed below the upper valve seat, which is threadedly connected to the plug valve body, via two limiting and steering blocks; a reading pressure relief connector with a one-way valve core is installed in the lower part of the plug valve body, which communicates with the center hole of the plug valve body; the reading pressure relief connector can be connected to a pressure gauge or a pressure relief needle valve via a locking mechanism, and is used to read the pressure in the construction tubing or to relieve pressure in the construction tubing.

2. The novel plug valve for blowout prevention reading of drilling and workover tubing as described in claim 1, characterized in that, The inner circle of the plug valve body is a non-uniform diameter inner circle, and from top to bottom, it consists of a blowout preventer connection cavity, an upper valve seat connection cavity, a lower valve seat, a center hole, and a drainage cavity. A limit and steering block mounting hole is provided in the body wall between the upper valve seat connection cavity and the lower valve seat. The blowout preventer connection cavity and the upper valve seat connection cavity of the plug valve body are both provided with internal threads, and the outer circle of the plug valve body at the drainage cavity is provided with external threads. The external threads at the blowout preventer connection cavity and the drainage cavity of the plug valve body can be respectively connected to the kill line and the tubing coupling thread. The internal thread in the upper valve seat connection cavity is an airtight thread.

3. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 2, characterized in that, The outer circle of the plug valve body is a non-uniform diameter outer circle, and the outer diameter of the lower part connected to the oil pipe coupling is smaller than the outer diameter of the upper part. Two or more force rod insertion holes are provided on the outer circle below the anti-blowout component connecting cavity. The limit steering block mounting holes are symmetrically arranged on both sides of the plug valve body between the upper valve seat connecting cavity and the lower valve seat. The two limit steering block mounting holes are both stepped holes with a smaller outer diameter and a larger inner diameter.

4. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 3, characterized in that, The two limiting steering blocks are installed facing each other and symmetrically in the limiting steering block mounting holes and connected to the plug valve core.

5. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 4, characterized in that, One end of each of the two limiting steering blocks has a stepped outer circle corresponding to the mounting hole of the limiting steering block, and an inner rotating square is provided at the outer end of the stepped outer circle; the other end of each of the two limiting steering blocks has a square block that mates with the connecting groove of the plug valve core; the square blocks in the two limiting steering blocks are connected to each other in the connecting groove of the plug valve core, and a sealing ring is provided between the square blocks in the two limiting steering blocks and the connecting groove of the plug valve core.

6. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 5, characterized in that, The outer circumference of the stop valve body below the mounting hole of the limit steering block is provided with a rotating square, and the reading pressure relief connector is installed in the quick connector connection hole in the stop valve body below the rotating square.

7. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 6, characterized in that, The quick connector connection hole is a convex-shaped hole with a smaller inner diameter and a larger outer diameter, and the internal thread in the smaller diameter hole can be threaded to connect with the pressure relief connector of the reading instrument; the pressure gauge connector or the body of the pressure relief needle valve can be installed in the larger diameter hole on the outside of the quick connector connection hole, which is connected to the connecting tenon in the pressure relief connector of the reading instrument; the pressure relief connector of the reading instrument is a high-pressure self-locking quick connector.

8. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 5, characterized in that, The lower valve seat is an arc-shaped inner cavity located below the mounting hole of the limit steering block and around the central hole of the plug valve body; the upper valve seat is a tubular body with an arc-shaped inner cavity at the bottom and external threads at the top, and the central hole of the upper valve seat is larger than the central hole of the plug valve body. An anti-corrosion layer is provided on the outer surface of the arc-shaped inner cavity at the bottom of the upper valve seat; the arc-shaped inner cavities of the upper and lower valve seats are both consistent with the shape of the plug valve core.

9. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 8, characterized in that, The stopcock valve core is a spherical body with a central hole for liquid flow, and the connecting groove is provided on both sides of the spherical body of the stopcock valve core and is a through groove perpendicular to the central hole for liquid flow.

10. A novel plug valve for reading blowout prevention gauges in drilling and workover tubing as described in claim 9, characterized in that, The inner diameter of the liquid flow center hole in the plug valve core is smaller than the inner diameter of the upper valve seat and the same as the diameter of the center hole below the lower valve seat in the plug valve body.

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