Blowout-preventing and anti-theft pressure-measuring sampling device for oil and gas wellhead

Abstract

The utility model is mainly applied to the technical field of oil exploitation, and particularly provides an oil and gas wellhead blowout prevention and theft prevention pressure measurement sampling device which comprises a main valve, a sampling valve, a plurality of limiting mechanisms, an automatic sealing mechanism and a sampling angle adjusting mechanism. A pressure gauge seat is arranged at one end of the main valve body and can be used for mounting and fixing a pressure gauge, and an automatic sealing mechanism is triggered when the pressure gauge is taken out to prevent oil from being sprayed out; the main valve body is welded and communicated with the sampling valve body in the horizontal direction through a rotating sleeve annularly wrapping the main valve body; the sampling valve core is arranged in the sampling valve body through threads, and a special tool is required to be inserted into a sampling valve port to rotate the valve core for sampling; the pressure measuring valve and the sampling valve are both provided with steel ball limiting mechanisms which are used for increasing the violent disassembly difficulty and limiting the movement range of a valve element, and the blowout prevention and theft prevention effects are achieved; the sampling angle adjusting mechanism is arranged on two sides of the main body and the rotating sleeve, needs to be opened by a special tool and is used for adjusting the sampling angle. The problems of liquid spraying and easy stealing and easy damage during pressure measurement and sampling of a traditional three-way pipeline are solved, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to an oil and gas wellhead blowout-proof and theft-proof pressure measuring and sampling device. Background Art

[0002] During the on-site production process at the pumping well site, it is necessary to measure the oil pressure and take some samples to collect data. The traditional method is to install a tee pipe in the oil pipeline and install a pressure gauge and a sampling device on the side outlet pipeline to measure pressure and take samples.

[0003] However, general sampling devices are not only inconvenient to install and dismantle, but also have no anti-blowout function. When sampling or disassembling the pressure gauge, oil often sprays out, which not only wastes resources but also causes environmental pollution. If the pressure gauge is disassembled privately or the sampling valve is opened to steal oil, the economic property of the relevant organization will suffer losses. Existing anti-theft measures, such as installing anti-theft locks, are difficult to ensure that crude oil will not leak if the locks are damaged. Utility Model Content

[0004] The utility model aims to provide an oil and gas wellhead anti-blowout and anti-theft pressure measuring sampling device, which replaces the traditional three-way pipe to improve the problems of oil spraying, easy theft and easy damage of the disassembled pressure gauge in the prior art.

[0005] In order to achieve the above objectives, the utility model provides an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device, comprising: a main valve body, an automatic sealing mechanism, a sampling valve body and a limit mechanism; the main valve body is a hollow column, a pressure gauge seat and a sheath are arranged at the upper end, a liquid inlet is arranged at the lower end, and the pressure gauge seat is used to install the pressure gauge; the automatic sealing mechanism is arranged inside the main valve body, and is movably installed on the pressure gauge seat along the axial direction of the main valve body; the automatic sealing mechanism is used to seal the main valve body when the pressure gauge is removed; the sampling valve body is rotatably connected and communicated with the main valve body in the horizontal direction through the sampling angle adjustment mechanism, and the liquid entering the main valve body Liquid can enter the sampling valve body through the sampling angle adjustment mechanism. A sampling valve core is provided inside the sampling valve body. A sampling port is provided on the side of the sampling valve body. The sampling valve core moves along the axial direction of the sampling valve body to open or close the sampling port; a limiting mechanism, the limiting mechanism includes: a first limiting mechanism and a second limiting mechanism, the first limiting mechanism is arranged on the contact surface between the side wall of the main valve body and the inner wall of the sleeve, and the second limiting mechanism is arranged on the contact surface between the inner wall of the sampling valve body and the outer wall of the sampling valve core; wherein the first limiting mechanism is used to limit the disassembly of the sleeve, and the second limiting mechanism is used to limit the disassembly of the sampling valve core and control the axial movement range of the sampling valve core.

[0006] Furthermore, the sheath is disposed on the upper end of the main valve body, and the sheath is used to limit the sampling angle adjustment mechanism along the axial direction of the main valve body.

[0007] Furthermore, the sampling valve core and the sampling valve body are connected by the sampling valve thread; the sampling valve core is rotated relative to the sampling valve body by means of the sampling valve thread, so that the sampling valve core moves axially along the sampling valve body.

[0008] Furthermore, the end of the sampling valve core is provided with a rotary joint, and the rotary joint is used to cooperate with an external sampling valve dedicated tool to rotate the sampling valve core.

[0009] Furthermore, the first limiting mechanism includes: a first limiting groove, a first steel ball, a first limiting hole, and a first limiting screw; wherein the first limiting groove is an annular groove, and the first limiting groove is arranged on the contact surface between the inner wall of the sleeve and the outer wall of the main valve body; there are one or more first steel balls, and one or more first steel balls are arranged in the first limiting groove; the first limiting hole is a columnar hole, and the first limiting hole is horizontally arranged in the outer wall of the sleeve and passes through the first limiting groove; the first limiting screw is arranged in the first limiting hole.

[0010] Furthermore, the second limiting mechanism includes: a second limiting groove, a second steel ball, a second limiting hole, and a second limiting screw; wherein the second limiting groove is an annular groove; the second limiting groove is arranged on the contact surface between the inner wall of the sampling valve body and the outer wall of the sampling valve core; there are one or more second steel balls, and one or more second steel balls are arranged in the second limiting groove; the second limiting hole is a columnar hole, and the second limiting hole is vertically arranged in the outer wall of the sampling valve body and passes through the second limiting groove; the second limiting screw is arranged in the second limiting hole.

[0011] Furthermore, the automatic sealing mechanism includes: a spring seat, which is arranged at the liquid inlet end of the main valve body; a sealing valve core, which is arranged inside the pressure gauge seat along the axial sliding of the main valve body, and an oil supply channel is provided inside the sealing valve core; a first return spring, which is fixed to the spring seat and supports the sealing valve core; wherein, when the pressure gauge is installed in the pressure gauge seat, the sealing valve core is pressed down to overcome the elastic force of the first return spring to open the oil supply channel; when the pressure gauge is removed from the pressure gauge seat, the first return spring drives the sealing valve core to reset to close the oil supply channel.

[0012] Furthermore, the sampling angle adjustment mechanism includes: a rotating sleeve, which is rotatably mounted on the main valve body, fixedly connected to one end of the sampling valve body, and connects the main valve body and the sampling valve body, and a plurality of fixing holes are opened on the side wall of the rotating sleeve; a fixed shaft, a plurality of fixed shafts are telescopically arranged in the plurality of fixing holes in a one-to-one correspondence; a fixed groove, a plurality of fixed grooves are arranged on the outer wall of the main valve body and correspond to the fixing holes in a one-to-one correspondence; a second return spring, a plurality of second return springs are mounted on the plurality of fixed shafts in a one-to-one correspondence, one end of the second return spring abuts against the bottom surface of the fixing hole, and the other end is clamped with the fixed shaft; wherein the fixed shaft has an initial position and an extreme position for axial movement along the fixing hole; when the fixed shaft is in the initial position, the upper end of the fixed shaft is flush with the outer wall of the rotating sleeve, and when the fixed shaft is clamped in the extreme position using a special tool for the fixed shaft, the fixed shaft is completely inside the fixed groove; only when all the fixed shafts are in the extreme position, the rotating sleeve can rotate around the main valve body.

[0013] Furthermore, a blocking wire is arranged on the inner wall of the fixing hole, and the blocking wire is used to limit the fixing shaft along the axial direction of the fixing hole.

[0014] Furthermore, a mounting thread adapted to the pipeline port is provided at the lower end of the main valve body.

[0015] An oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device using the technical solution of the utility model comprises a main valve body, an automatic sealing mechanism, a sampling valve body and a limit mechanism; the main valve body is a hollow column, with a pressure gauge seat and a sheath provided at the upper end, and a liquid inlet provided at the lower end, and the pressure gauge seat is used to install the pressure gauge; the automatic sealing mechanism is provided inside the main valve body and is movably installed on the pressure gauge seat along the axial direction of the main valve body; the automatic sealing mechanism is used to seal the main valve body when the pressure gauge is removed; the sampling valve body is rotatably connected and communicated with the main valve body in the horizontal direction through the sampling angle adjustment mechanism, and the liquid entering the main valve body The sampling valve body can be entered through the sampling angle adjustment mechanism, a sampling valve core is arranged inside the sampling valve body, a sampling port is arranged on the side of the sampling valve body, and the sampling valve core moves along the axial direction of the sampling valve body to open or close the sampling port; a limiting mechanism, the limiting mechanism comprises: a first limiting mechanism and a second limiting mechanism, the first limiting mechanism is arranged on the contact surface between the side wall of the main valve body and the inner wall of the sleeve, and the second limiting mechanism is arranged on the contact surface between the inner wall of the sampling valve body and the outer wall of the sampling valve core; wherein the first limiting mechanism is used to limit the disassembly of the sleeve, and the second limiting mechanism is used to limit the disassembly of the sampling valve core and control the axial movement range of the sampling valve core. When the pressure gauge is removed, the automatic sealing mechanism seals the main valve body, avoiding the problem of liquid spraying or leakage that may occur in traditional pressure measurement; when the sampling valve is opened using a special tool for the sampling valve, due to the limitation of the limit mechanism, the valve can only controllably open a small part of the sampling port, so that in the maximum open state, the oil can only flow out slowly, reducing the problem of waste of liquid spray; due to the setting of the first limit mechanism, the sheath is difficult to be removed violently, which can reduce the situation where the pressure gauge seat and the rotating sleeve of the sampling angle adjustment mechanism are removed; the setting of the second limit mechanism makes it impossible to remove the sampling valve core before the second limit mechanism is violently disassembled, reducing the situation where the oil is stolen; the use of special tools for sampling valves and professional tools for rotating sleeves reduces the phenomenon of illegal sampling by non-professionals, reduces the possibility of damage to the device, and also reduces the possibility of oil theft. In summary, the oil and gas wellhead anti-blowout and anti-theft pressure measurement sampling device of the utility model technical solution can improve the problems of oil spraying, easy theft and easy damage when the pressure gauge is disassembled and assembled in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device that can be selected according to an embodiment of the utility model;

[0018] Figure 2It is a schematic cross-sectional structure diagram of a main valve body of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device that can be selected according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the internal structure of a main valve body of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device that can be selected according to an embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of a first limit mechanism of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device that can be selected according to an embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of a second limit mechanism of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device that can be selected according to an embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of a sampling angle adjustment mechanism of an oil and gas wellhead anti-blowout and anti-theft pressure measurement sampling device that can be selected according to an embodiment of the utility model;

[0023] Figure 7 It is a functional schematic diagram of a sampling valve special tool of an oil and gas wellhead anti-blowout and anti-theft pressure measurement sampling device that can be selected according to an embodiment of the utility model; and

[0024] Figure 8 It is a functional schematic diagram of a special tool for fixing the shaft of an oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device which can be selected according to an embodiment of the utility model.

[0025] The above drawings include the following reference numerals:

[0026] 10. Main valve body; 101. First main valve cavity; 102. Main valve channel; 103. Second main valve cavity; 11. Pressure gauge seat; 12. Sheath; 121. Mounting hole; 13. Liquid inlet; 14. Mounting thread; 20. Sampling valve body; 21. Sampling valve core; 211. Rotary joint; 22. Sampling port; 23. Sampling valve thread; 30. Limiting mechanism; 31. First limiting mechanism; 311. First limiting groove; 312. First steel ball; 313. First limiting hole; 314. First limiting screw; 32. The second limiting mechanism; 321, the second limiting groove; 322, the second steel ball; 323, the second limiting hole; 324, the second limiting screw; 40, the automatic sealing mechanism; 41, the spring seat; 42, the sealing valve core; 421, the oil delivery channel; 43, the first return spring; 50, the sampling angle adjustment mechanism; 51, the rotating sleeve; 511, the fixing hole; 512, the blocking wire; 52, the fixed shaft; 53, the fixing groove; 54, the second return spring; 60, the special tool for the sampling valve; 70, the special tool for the fixed shaft; 71, the working shaft. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] According to the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device of the utility model, refer to Figures 1 to 6 , including a main valve body 10, an automatic sealing mechanism 40, a sampling valve body 20 and a limiting mechanism 30; the main valve body 10 is a hollow column, with a pressure gauge seat 11 and a sheath 12 arranged at the upper end, the pressure gauge seat is pressed and fixed by a nut, and a liquid inlet 13 is arranged at the lower end, and the pressure gauge seat 11 is used to install the pressure gauge through a thread; the automatic sealing mechanism 40 is arranged inside the main valve body 10, passes through the main cavity and the sealing cavity, and is movably installed on the pressure gauge seat 11 along the axial direction of the main valve body 10; the automatic sealing mechanism 40 is used to seal the main valve body 10 when the pressure gauge is removed; the sampling valve body 20 is rotatably connected and communicated with the main valve body 10 in the horizontal direction through the sampling angle adjustment mechanism 50, and the liquid entering the main valve body can be The angle adjustment mechanism 50 enters the sampling valve body 20, a sampling valve core 21 is arranged inside the sampling valve body 20, a sampling port 22 is arranged on the side of the sampling valve body 20, and the sampling valve core 21 moves along the axial direction of the sampling valve body to open or close the sampling port 22; the limiting mechanism 30, the limiting mechanism includes: a first limiting mechanism 31 and a second limiting mechanism 32, the first limiting mechanism 31 is arranged on the contact surface between the side wall of the main valve body 10 and the inner wall of the sleeve 12, and the second limiting mechanism 32 is arranged on the contact surface between the inner wall of the sampling valve body 20 and the outer wall of the sampling valve core 21; wherein, the first limiting mechanism 31 is used to limit the disassembly of the sleeve 12, and the second limiting mechanism 32 is used to limit the disassembly of the sampling valve core 21 and control the axial movement range of the sampling valve core 21. When the pressure gauge is removed, the automatic sealing mechanism 40 seals the main valve body 10, avoiding the problem of liquid spraying or leakage that may occur in traditional pressure measurement; when the sampling valve is opened using the sampling valve special tool 60, due to the limitation of the limit mechanism, the valve can only controllably open a small part of the sampling port 22, so that in the maximum open state, the oil can only flow out slowly, reducing the problem of waste of liquid spray; due to the setting of the first limit mechanism 31, the sheath 12 is difficult to be removed violently, which can reduce the situation where the pressure gauge seat 11 and the rotating sleeve 51 of the sampling angle adjustment mechanism 50 are removed; the setting of the second limit mechanism 32 makes it impossible to remove the sampling valve core 21 before the second limit mechanism 32 is violently disassembled, reducing the situation where the oil is stolen; the use of the sampling valve special tool 60 and the fixed shaft special tool 70 reduces the phenomenon of illegal sampling by non-professionals, reduces the possibility of damage to the device, and also reduces the possibility of oil theft. In summary, this embodiment can improve the problems of oil spraying, easy theft and easy damage when disassembling and assembling the pressure gauge in the prior art.

[0029] When implementing it, Figure 1 and Figure 3 As shown, the internal cavity of the main valve body 10, starting from the liquid inlet 13 from bottom to top, is respectively the first main valve cavity 101, the main valve channel 102, and the second main valve cavity 103; the first main valve cavity 101, the main valve channel 102 and the second main valve cavity 103 are all cylindrical spaces, and are interconnected; wherein, the inner diameter of the second main valve cavity 103 is larger than the inner diameter of the first main valve cavity 101, which is larger than the inner diameter of the main valve channel 102, and they form a stepped structure with each other. The first main valve cavity 101 is used to receive the oil from the liquid inlet 13, and is provided with a channel in the horizontal direction, and the outer wall of the first main valve cavity 101 is provided with a circle of oil grooves surrounding the main valve body 10 and passing through the channel, and the oil can enter the oil groove through the channel and enter the sampling valve body 20 through the sampling angle adjustment mechanism 50; the second main valve cavity 103 is used to install the pressure gauge seat 11, and the pressure gauge seat 11 is pressed and fixed with a spare nut, and when the pressure gauge seat 11 is installed, the internal columnar channel of the pressure gauge seat 11 is aligned with the main valve channel 102, at this time, the oil can flow from the liquid inlet 13 into the first main valve cavity 101, the main valve channel 102, and the internal columnar channel of the pressure gauge seat 11 in turn to reach the pressure gauge to complete the pressure measurement; the outer wall of the pressure gauge seat 11 and the inner wall of the second main valve cavity 103 are provided with two circles of sealing rings to prevent the oil from seeping out from the gap between the pressure gauge seat 11 and the inner wall of the second main valve cavity 103.

[0030] Furthermore, to prevent oil from spraying out when the pressure gauge is removed, Figures 1 to 3As shown, an automatic sealing mechanism 40 is provided inside the main valve body, including a spring seat 41, a sealing valve core 42, and a first return spring 43: the spring seat 41 is arranged inside the first main valve cavity 101, and is integrally formed with the first main valve cavity 101. In order to avoid blocking the oil passage, the spring seat 41 is arranged as a ring structure with a transparent middle; the first return spring 43 is welded to the upper part of the spring seat 41, and is vertically placed inside the first main valve cavity 101, with the upper end supporting the sealing valve core 42; the thin columnar body of the upper part of the sealing valve core 42 slides along the axial direction of the main valve body 10, It is arranged in the columnar channel inside the pressure gauge seat 11 and the main valve channel 102, the thin column body of the upper part of the sealing valve core 42 is the same width as the main valve channel 102, and the thin column body has an oil delivery channel 421 inside, and the oil delivery channel 421 is divided into a horizontal oil channel that runs through the radial direction of the sealing valve core, and a vertical oil channel that is arranged along the axial direction of the sealing valve core and connected to the horizontal oil channel; the lower half of the sealing valve core 42 is conically widened to limit the sealing valve core 42 to prevent the sealing valve core 42 from escaping from above the pressure gauge seat 11, and the bottom diameter matches the inner diameter of the first return spring 43. In actual use of the pressure measuring function of the device, the pressure gauge is installed into the pressure gauge seat 11 through threads. At this time, the elastic force of the first reset spring 43 is overcome to press down the sealing valve core 42, and the horizontal oil channel enters the first main valve cavity 101. The oil passes through the liquid inlet 13, the first main valve cavity 101, the horizontal oil channel, and the vertical oil channel in turn to reach the pressure gauge, and the pressure reading can be carried out; when the pressure gauge is removed from the pressure gauge seat 11, the first reset spring 43 pushes the sealing valve core 42 to reset, and the horizontal oil channel enters the main valve channel 102. The oil cannot enter the horizontal oil channel. At this time, the upper end of the main valve body 10 is automatically sealed, which can reduce the occurrence of oil spraying during the pressure measurement work.

[0031] Furthermore, if Figure 1 and Figure 2 As shown, the sheath 12 is a cylindrical structure, the upper end is half-closed and has a circular hole, the sheath 12 is sleeved on the upper end of the main valve body 10, and the inner wall of the sheath is fixedly connected to the outer wall of the upper end of the main valve body 10 through the first limiting mechanism 31; the sheath 12 is used to limit the sampling angle adjustment mechanism 50 along the axial direction of the main valve body 10, and when the sheath 12 is not removed, the sampling angle adjustment mechanism 50 cannot move vertically along the axial direction of the main valve body 10 due to the obstruction of the outer wall of the sheath 12. Therefore, when the sheath 12 is not removed, the sampling angle adjustment mechanism 50 and the sampling valve body 20 welded thereon cannot be removed, which has an anti-theft function. Optionally, a mounting hole 121 is provided on one side of the upper end of the sheath 12, and the mounting hole 121 passes through the sheath and passes into the pressure gauge seat. The mounting hole 121 is used to insert a stop pin, and when the pressure gauge is installed through the upper end thread of the pressure gauge seat 11, the pressure gauge seat 11 is prevented from rotating together with the pressure gauge.

[0032] Specifically, Figure 4As shown, the first limiting mechanism 31 includes: a first limiting groove 311, a first steel ball 312, a first limiting hole 313, and a first limiting screw 314; wherein the first limiting groove 311 is an annular groove, and the first limiting groove 311 is arranged at the contact surface between the inner wall of the sleeve 12 and the outer wall of the main valve body 10; in this embodiment, two first steel balls 312 are arranged in the first limiting groove 311; the first limiting hole 313 is a columnar hole, and the first limiting hole 313 is horizontally arranged in the outer wall of the sleeve 12 and connected with the first limiting groove 311; the first limiting screw 314 is arranged in the first limiting hole 313. Preferably, the annular groove width of the first limiting groove 311 is larger than the diameter of the first steel ball 312 by 0.5 to 1.5 mm, so as to ensure that the sleeve 12 is tightly fitted on the upper end of the main valve body 10, and to ensure that the first steel ball 312 can roll in the first limiting groove 311, as a necessary condition for the first steel ball 312 to be removed.

[0033] Furthermore, if Figure 1 As shown, the sampling valve core 21 is cylindrical as a whole, the left part of the column body is thinner, and the right part of the column body is thicker, the left and right parts are connected in a step-shaped manner, and the sampling valve core 21 is completely placed in the sampling valve body 20; wherein the left part of the sampling valve core 21 is provided with two circles of sealing rings; the right part of the sampling valve core 21 is provided with a sampling valve thread 23 around the column body, and two circles of rectangular protrusions are provided around the column body to cooperate with the sampling valve body 20 to form a second limit mechanism 32; the sampling valve core 21 and the sampling valve body 20 are connected by the sampling valve thread 23, when the sampling valve core 21 rotates relative to the sampling valve body 20, the sampling valve core 21 can move along the axial direction of the sampling valve body 20; the end of the left part of the sampling valve core 21 is a flat-headed cone structure, when the sampling valve core 21 moves to the left, the side of the left part end is sealed with the fine channel opening of the sampling valve body 20; when sampling, the sampling valve core 21 moves right to open the sampling port 22. The sampling valve thread 23 is also provided to resist the hydraulic thrust exerted on the sampling valve core 21 in the horizontal direction, and at the same time limit the axial movement rate of the sampling valve core 21 .

[0034] Specifically, Figure 5As shown, the second limiting mechanism 32 includes: a second limiting groove 321, a second steel ball 322, a second limiting hole 323, and a second limiting screw 324; wherein the second limiting groove 321 is an annular groove; the second limiting groove 321 is arranged on the contact surface between the inner wall of the sampling valve body 20 and the outer wall of the sampling valve core 21; in this embodiment, two second steel balls 322 are arranged in the second limiting groove 321; the second limiting hole 323 is a columnar hole, the second limiting hole 323 is vertically arranged in the outer wall of the sampling valve body 20 and connected with the second limiting groove 321; the second limiting screw 324 is arranged in the second limiting hole 323. Preferably, the second limiting groove 321 is an annular rectangular groove, the long side of which is parallel to the axial direction of the sampling valve core 21 and reserves the length required for the sampling port 22 to open, and is the same width as the gap between the two annular rectangular protrusions on the right part of the sampling valve core 21, and the rectangular width is 0.5-1.5 mm larger than the diameter of the second steel ball 322. When the sampling valve core 21 rotates and translates to the right, the annular rectangular protrusion on the right part of the sampling valve core 21 pushes the second steel ball 322 to move right, and when the second steel ball 322 contacts the right edge of the second limiting groove 321, it is blocked. At this time, the sampling valve core 21 is also blocked by the second steel ball 322 so that it cannot continue to move right, thereby forming a limit on the sampling valve core 21 to limit the maximum opening degree of the sampling port 22. When the sampling port 22 is opened to the maximum extent, the oil only flows out slowly, achieving the effect of spray prevention, and when the second limiting mechanism 32 is not removed, the sampling valve core 21 cannot be taken out from the sampling valve body 20, which has an anti-theft effect.

[0035] Preferably, if Figure 1 and Figure 7 As shown, a rotary joint 211 is provided at the end of the sampling valve core 21, and the rotary joint 211 is used to cooperate with the external sampling valve special tool 60 to rotate the sampling valve core 21, so as to increase the anti-theft effect. The main body of the sampling valve special tool 60 is a disc-shaped structure, and a sleeve-shaped interface is provided at the left end, and the sleeve-shaped interface can be connected to the rotary joint 211, and the outer wall of the sleeve of the sampling valve special tool 60 is tightly matched with the inner wall of the sampling valve body 20, and the inner wall of the sleeve of the sampling valve special tool 60 is tightly matched with the outer wall of the sampling valve core 21. The friction between the inner wall of the sleeve and the outer wall of the rotary joint 211 is increased by pressure to rotate the sampling valve core 21, thereby increasing the anti-theft effect.

[0036] In order to provide professionals with the conditions for installation, disassembly and repair, after loosening the first limit screw 314, the first steel ball 312 can be taken out to release the first limit mechanism 31, which is difficult to be disassembled by general violent means. The second limit mechanism 32 is the same. Optionally, both the first limit screw 314 and the second limit screw 324 are hexagon socket flat-end set screws.

[0037] Preferably, if Figure 1 , Figure 2 and Figure 6As shown, the sampling angle adjustment mechanism 50 includes a rotating sleeve 51, a fixed shaft 52, a fixed groove, and a second reset spring 54; wherein the rotating sleeve 51 is rotatably sleeved on the main valve body 10, and an annular oil groove is provided on the inner wall of the rotating sleeve 51 to cooperate with the annular oil groove on the outer wall of the first main valve cavity 101 to form an oil channel, the rotating sleeve 51 is fixedly connected to one end of the sampling valve body 20, and a hole is punched in the oil channel to connect the main valve body 10 and the sampling valve body 20, and a fixing hole 511 is opened on the side wall of the rotating sleeve 51; a plurality of fixed shafts 52 are telescopically arranged in the plurality of fixing holes 511 in a one-to-one correspondence; the fixing Groove 53, there are multiple fixed grooves 53, multiple fixed grooves 53 are arranged on the outer wall of the main valve body 10, and correspond to the fixed holes 511 one by one; second return spring 54, there are multiple second return springs 54 and they are sleeved on multiple fixed shafts 52 one by one, one end of the second return spring 54 abuts against the bottom surface of the fixed hole 511, and the other end of the second return spring 54 is clamped with the fixed shaft 52; in this embodiment, there are two fixed shafts 52, fixed grooves 53, fixed holes 511, and second return springs 54 corresponding to each other, and they are arranged in pairs along the radial ends of the rotating sleeve 51. Among them, the fixed shaft 52 has an initial position and an extreme position for axial movement along the fixed hole 511; when the fixed shaft 52 is in the initial position, the upper end of the fixed shaft 52 is flush with the outer wall of the rotating sleeve 51, and when the fixed shaft 52 is clamped in the extreme position, the fixed shaft 52 is completely inside the fixed groove 53; only when all the fixed shafts 52 are in the extreme position, the rotating sleeve 51 can rotate around the main valve body 10 to achieve the function of adjusting the sampling angle. Furthermore, a blocking wire 512 is provided on the inner wall of the fixing hole 511 to limit the fixing shaft 52 and prevent the fixing shaft 52 from falling out of the fixing hole 511 .

[0038] Preferably, if Figure 2 , Figure 6 and Figure 8 As shown, the opening of the sampling angle adjustment mechanism 50 can be completed by using a special tool 70 for the fixed shaft. The staff aligns the action shaft 71 of the special tool 70 for the fixed shaft with the fixed shafts 52 on both sides of the rotating sleeve 51, and rotates the circular valves at the rear end of the action shaft 71 to move the action shafts 71 on both sides toward the center. When the action shafts 71 on both sides are pressed against the fixed shaft 52, the fixed shaft 52 reaches the limit state. At this time, the upper surface of the fixed shaft 52 is lower than the lower edge of the inner wall of the rotating sleeve 51. The rotating sleeve 51 and the sampling valve body 20 can be rotated by the handle of the special tool 70 for the fixed shaft to adjust the sampling horizontal angle.

[0039] Preferably, if Figure 1 As shown, the lower end of the sampling valve core 21 is provided with a mounting thread 14 adapted to the pipeline port, so as to facilitate the installation of the wellhead pipeline.

[0040] During specific use, the user installs the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device of this embodiment to the wellhead pipeline through the installation thread 14, which can be used to complete the pressure measurement and sampling work. When the pressure is measured, the user can install the pressure gauge to the pressure gauge seat 11. When the pressure gauge is pressed down, the elastic force of the first reset spring 43 is overcome, so that the sealing valve core 42 falls to make the oil delivery channel 421 and the liquid inlet 13 unblocked. The liquid enters the pressure gauge through the oil delivery channel 421, and the pressure can be measured. After the pressure measurement is completed, the pressure gauge is removed, and the first reset spring 43 is reset to push the sealing valve core 42 to rise. The oil delivery channel 421 is blocked by the inner wall of the main valve body 10 to seal and prevent liquid from spraying out; during sampling, the fixed shaft is used to fix the shaft. The tool 70 and the sampling angle adjustment mechanism 50 are used to adjust the horizontal movement of the sampling valve body 20. After reaching a suitable sampling angle, the sampling valve core 21 is rotated using the sampling valve special tool 60, so that the sampling valve core 21 moves outward along the axial direction of the sampling valve body 20 to reach the maximum horizontal movement range limited by the second limit mechanism 32. At this time, since the opening degree of the sampling port 22 is small and controllable, the liquid cannot be sprayed out. After sampling is completed, the sampling valve core 21 is rotated in the opposite direction using the sampling valve special tool 60, and the sampling port 22 can be closed. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device does not need to be removed after installation. In the event of theft, since the sampling port 22 switch requires the use of the sampling valve special tool 60, the sampling valve core 21 can be rotated, and general tools such as needle-nosed pliers and vises cannot open the sampling port 22; to remove the sleeve 12, it is necessary to loosen the first side limit screw 314 and take out the first steel ball 312 to remove the first limit mechanism 31, otherwise the sleeve 12 cannot be removed; similarly, the complete removal of the sampling valve core 21 requires the removal of the second limit mechanism 32 to achieve the anti-theft function. And due to the restrictions on the use of the sampling valve special tool 60, the occurrence of misoperation by non-professionals can be reduced. In summary, the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device in this embodiment can achieve a certain anti-blowout and anti-theft effect on the basis of realizing the pressure measurement and sampling function during specific use.

[0041] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict. The utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] According to the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device of the utility model, refer to Figures 1 to 6, including a main valve body 10, an automatic sealing mechanism 40, a sampling valve body 20 and a limiting mechanism 30; the main valve body 10 is a hollow column, with a pressure gauge seat 11 and a sheath 12 arranged at the upper end, the pressure gauge seat is pressed and fixed by a nut, and a liquid inlet 13 is arranged at the lower end, and the pressure gauge seat 11 is used to install the pressure gauge through a thread; the automatic sealing mechanism 40 is arranged inside the main valve body 10, passes through the main cavity and the sealing cavity, and is movably installed on the pressure gauge seat 11 along the axial direction of the main valve body 10; the automatic sealing mechanism 40 is used to seal the main valve body 10 when the pressure gauge is removed; the sampling valve body 20 is rotatably connected and communicated with the main valve body 10 in the horizontal direction through the sampling angle adjustment mechanism 50, and the liquid entering the main valve body can be The angle adjustment mechanism 50 enters the sampling valve body 20, a sampling valve core 21 is arranged inside the sampling valve body 20, a sampling port 22 is arranged on the side of the sampling valve body 20, and the sampling valve core 21 moves along the axial direction of the sampling valve body to open or close the sampling port 22; the limiting mechanism 30, the limiting mechanism includes: a first limiting mechanism 31 and a second limiting mechanism 32, the first limiting mechanism 31 is arranged on the contact surface between the side wall of the main valve body 10 and the inner wall of the sleeve 12, and the second limiting mechanism 32 is arranged on the contact surface between the inner wall of the sampling valve body 20 and the outer wall of the sampling valve core 21; wherein, the first limiting mechanism 31 is used to limit the disassembly of the sleeve 12, and the second limiting mechanism 32 is used to limit the disassembly of the sampling valve core 21 and control the axial movement range of the sampling valve core 21. When the pressure gauge is removed, the automatic sealing mechanism 40 seals the main valve body 10, avoiding the problem of liquid spraying or leakage that may occur in traditional pressure measurement; when the sampling valve is opened using the sampling valve special tool 60, due to the limitation of the limit mechanism, the valve can only controllably open a small part of the sampling port 22, so that in the maximum open state, the oil can only flow out slowly, reducing the problem of waste of liquid spray; due to the setting of the first limit mechanism 31, the sheath 12 is difficult to be removed violently, which can reduce the situation where the pressure gauge seat 11 and the rotating sleeve 51 of the sampling angle adjustment mechanism 50 are removed; the setting of the second limit mechanism 32 makes it impossible to remove the sampling valve core 21 before the second limit mechanism 32 is violently disassembled, reducing the situation where the oil is stolen; the use of the sampling valve special tool 60 and the professional rotating sleeve tool 70 reduces the phenomenon of illegal sampling by non-professionals, reduces the possibility of damage to the device, and also reduces the possibility of oil theft. In summary, this embodiment can improve the problems of oil spraying, easy theft and easy damage when disassembling and assembling the pressure gauge in the prior art.

[0043] When implementing it, Figure 1 and Figure 3As shown, the internal cavity of the main valve body 10, starting from the liquid inlet 13 from bottom to top, is respectively the first main valve cavity 101, the main valve channel 102, and the second main valve cavity 103; the first main valve cavity 101, the main valve channel 102 and the second main valve cavity 103 are all cylindrical spaces, and are interconnected; wherein, the inner diameter of the second main valve cavity 103 is larger than the inner diameter of the first main valve cavity 101, which is larger than the inner diameter of the main valve channel 102, and they form a stepped structure with each other. The first main valve cavity 101 is used to receive the oil from the liquid inlet 13, and is provided with a channel in the horizontal direction, and the outer wall of the first main valve cavity 101 is provided with a circle of oil grooves surrounding the main valve body 10 and passing through the channel, and the oil can enter the oil groove through the channel and enter the sampling valve body 20 through the sampling angle adjustment mechanism 50; the second main valve cavity 103 is used to install the pressure gauge seat 11, and the pressure gauge seat 11 is pressed and fixed with a spare nut, and when the pressure gauge seat 11 is installed, the internal columnar channel of the pressure gauge seat 11 is aligned with the main valve channel 102, at this time, the oil can flow from the liquid inlet 13 into the first main valve cavity 101, the main valve channel 102, and the internal columnar channel of the pressure gauge seat 11 in turn to reach the pressure gauge to complete the pressure measurement; the outer wall of the pressure gauge seat 11 and the inner wall of the second main valve cavity 103 are provided with two circles of sealing rings to prevent the oil from seeping out from the gap between the pressure gauge seat 11 and the inner wall of the second main valve cavity 103.

[0044] Furthermore, to prevent oil from spraying out when the pressure gauge is removed, Figures 1 to 3As shown, an automatic sealing mechanism 40 is provided inside the main valve body, including a spring seat 41, a sealing valve core 42, and a first return spring 43: the spring seat 41 is arranged inside the first main valve cavity 101, and is integrally formed with the first main valve cavity 101. In order to avoid blocking the oil passage, the spring seat 41 is arranged as a ring structure with a transparent middle; the first return spring 43 is welded to the upper part of the spring seat 41, and is vertically placed inside the first main valve cavity 101, with the upper end supporting the sealing valve core 42; the thin columnar body of the upper part of the sealing valve core 42 slides along the axial direction of the main valve body 10, It is arranged in the columnar channel inside the pressure gauge seat 11 and the main valve channel 102, the thin column body of the upper part of the sealing valve core 42 is the same width as the main valve channel 102, and the thin column body has an oil delivery channel 421 inside, and the oil delivery channel 421 is divided into a horizontal oil channel that runs through the radial direction of the sealing valve core, and a vertical oil channel that is arranged along the axial direction of the sealing valve core and connected to the horizontal oil channel; the lower half of the sealing valve core 42 is conically widened to limit the sealing valve core 42 to prevent the sealing valve core 42 from escaping from above the pressure gauge seat 11, and the bottom diameter matches the inner diameter of the first return spring 43. In actual use of the pressure measuring function of the device, the pressure gauge is installed into the pressure gauge seat 11 through threads. At this time, the elastic force of the first reset spring 43 is overcome to press down the sealing valve core 42, and the horizontal oil channel enters the first main valve cavity 101. The oil passes through the liquid inlet 13, the first main valve cavity 101, the horizontal oil channel, and the vertical oil channel in turn to reach the pressure gauge, and the pressure reading can be carried out; when the pressure gauge is removed from the pressure gauge seat 11, the first reset spring 43 pushes the sealing valve core 42 to reset, and the horizontal oil channel enters the main valve channel 102. The oil cannot enter the horizontal oil channel. At this time, the upper end of the main valve body 10 is automatically sealed, which can reduce the occurrence of oil spraying during the pressure measurement work.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, the sheath 12 is a cylindrical structure, the upper end is half-closed and has a circular hole, the sheath 12 is sleeved on the upper end of the main valve body 10, and the inner wall of the sheath is fixedly connected to the outer wall of the upper end of the main valve body 10 through the first limiting mechanism 31; the sheath 12 is used to limit the sampling angle adjustment mechanism 50 along the axial direction of the main valve body 10, and when the sheath 12 is not removed, the sampling angle adjustment mechanism 50 cannot move vertically along the axial direction of the main valve body 10 due to the obstruction of the outer wall of the sheath 12. Therefore, when the sheath 12 is not removed, the sampling angle adjustment mechanism 50 and the sampling valve body 20 welded thereon cannot be removed, which has an anti-theft function. Optionally, a mounting hole 121 is provided on one side of the upper end of the sheath 12, and the mounting hole 121 passes through the sheath and passes into the pressure gauge seat. The mounting hole 121 is used to insert a stop pin, and when the pressure gauge is installed through the upper end thread of the pressure gauge seat 11, the pressure gauge seat 11 is prevented from rotating together with the pressure gauge.

[0046] Specifically, Figure 4As shown, the first limiting mechanism 31 includes: a first limiting groove 311, a first steel ball 312, a first limiting hole 313, and a first limiting screw 314; wherein the first limiting groove 311 is an annular groove, and the first limiting groove 311 is arranged at the contact surface between the inner wall of the sleeve 12 and the outer wall of the main valve body 10; in this embodiment, two first steel balls 312 are arranged in the first limiting groove 311; the first limiting hole 313 is a columnar hole, and the first limiting hole 313 is horizontally arranged in the outer wall of the sleeve 12 and connected with the first limiting groove 311; the first limiting screw 314 is arranged in the first limiting hole 313. Preferably, the annular groove width of the first limiting groove 311 is larger than the diameter of the first steel ball 312 by 0.5 to 1.5 mm, so as to ensure that the sleeve 12 is tightly fitted on the upper end of the main valve body 10, and to ensure that the first steel ball 312 can roll in the first limiting groove 311, as a necessary condition for the first steel ball 312 to be removed.

[0047] Furthermore, if Figure 1 As shown, the sampling valve core 21 is cylindrical as a whole, the left part of the column body is thinner, and the right part of the column body is thicker, the left and right parts are connected in a step-shaped manner, and the sampling valve core 21 is completely placed in the sampling valve body 20; wherein the left part of the sampling valve core 21 is provided with two circles of sealing rings; the right part of the sampling valve core 21 is provided with a sampling valve thread 23 around the column body, and two circles of rectangular protrusions are provided around the column body to cooperate with the sampling valve body 20 to form a second limit mechanism 32; the sampling valve core 21 and the sampling valve body 20 are connected by the sampling valve thread 23, when the sampling valve core 21 rotates relative to the sampling valve body 20, the sampling valve core 21 can move along the axial direction of the sampling valve body 20; the end of the left part of the sampling valve core 21 is a flat-headed cone structure, when the sampling valve core 21 moves to the left, the side of the left part end is sealed with the fine channel opening of the sampling valve body 20; when sampling, the sampling valve core 21 moves right to open the sampling port 22. The sampling thread 23 is also provided to resist the hydraulic thrust exerted on the sampling valve core 21 in the horizontal direction, and at the same time limit the axial movement rate of the sampling valve core 21 .

[0048] Specifically, Figure 5As shown, the second limiting mechanism 32 includes: a second limiting groove 321, a second steel ball 322, a second limiting hole 323, and a second limiting screw 324; wherein the second limiting groove 321 is an annular groove; the second limiting groove 321 is arranged on the contact surface between the inner wall of the sampling valve body 20 and the outer wall of the sampling valve core 21; in this embodiment, two second steel balls 322 are arranged in the second limiting groove 321; the second limiting hole 323 is a columnar hole, the second limiting hole 323 is vertically arranged in the outer wall of the sampling valve body 20 and connected with the second limiting groove 321; the second limiting screw 324 is arranged in the second limiting hole 323. Preferably, the second limiting groove 321 is an annular rectangular groove, the long side of which is parallel to the axial direction of the sampling valve core 21 and reserves the length required for the sampling port 22 to open, and is the same width as the gap between the two annular rectangular protrusions on the right part of the sampling valve core 21, and the rectangular width is 0.5-1.5 mm larger than the diameter of the second steel ball 322. When the sampling valve core 21 rotates and translates to the right, the annular rectangular protrusion on the right part of the sampling valve core 21 pushes the second steel ball 322 to move right, and when the second steel ball 322 contacts the right edge of the second limiting groove 321, it is blocked. At this time, the sampling valve core 21 is also blocked by the second steel ball 322 so that it cannot continue to move right, thereby forming a limit on the sampling valve core 21 to limit the maximum opening degree of the sampling port 22. When the sampling port 22 is opened to the maximum extent, the oil only flows out slowly, achieving the effect of spray prevention, and when the second limiting mechanism 32 is not removed, the sampling valve core 21 cannot be taken out from the sampling valve body 20, which has an anti-theft effect.

[0049] Preferably, if Figure 1 and Figure 7 As shown, a rotary joint 211 is provided at the end of the sampling valve core 21, and the rotary joint 211 is used to cooperate with the external sampling valve special tool 60 to rotate the sampling valve core 21, so as to increase the anti-theft effect. The main body of the sampling valve special tool 60 is a disc-shaped structure, and a sleeve-shaped interface is provided at the left end, and the sleeve-shaped interface can be connected to the rotary joint 211, and the outer wall of the sleeve of the sampling valve special tool 60 is tightly matched with the inner wall of the sampling valve body 20, and the inner wall of the sleeve of the sampling valve special tool 60 is tightly matched with the outer wall of the sampling valve core 21. The friction between the inner wall of the sleeve and the outer wall of the rotary joint 211 is increased by pressure to rotate the sampling valve core 21, thereby increasing the anti-theft effect.

[0050] In order to provide professionals with the conditions for installation, disassembly and repair, after loosening the first limit screw 314, the first steel ball 312 can be taken out to release the first limit mechanism 31, which is difficult to be disassembled by general violent means. The second limit mechanism 32 is the same. Optionally, both the first limit screw 314 and the second limit screw 324 are hexagon socket flat-end set screws.

[0051] Preferably, if Figure 1 , Figure 2 and Figure 6As shown, the sampling angle adjustment mechanism 50 includes a rotating sleeve 51, a fixed shaft 52, a fixed groove, and a second reset spring 54; wherein the rotating sleeve 51 is rotatably sleeved on the main valve body 10, and an annular oil groove is provided on the inner wall of the rotating sleeve 51 to cooperate with the annular oil groove on the outer wall of the first main valve cavity 101 to form an oil channel, the rotating sleeve 51 is fixedly connected to one end of the sampling valve body 20, and a hole is punched in the oil channel to connect the main valve body 10 and the sampling valve body 20, and a fixing hole 511 is opened on the side wall of the rotating sleeve 51; a plurality of fixed shafts 52 are telescopically arranged in the plurality of fixing holes 511 in a one-to-one correspondence; the fixing Groove 53, there are multiple fixed grooves 53, multiple fixed grooves 53 are arranged on the outer wall of the main valve body 10, and correspond to the fixed holes 511 one by one; second return spring 54, there are multiple second return springs 54 and they are sleeved on multiple fixed shafts 52 one by one, one end of the second return spring 54 abuts against the bottom surface of the fixed hole 511, and the other end of the second return spring 54 is clamped with the fixed shaft 52; in this embodiment, there are two fixed shafts 52, fixed grooves 53, fixed holes 511, and second return springs 54 corresponding to each other, and they are arranged in pairs along the radial ends of the rotating sleeve 51. Among them, the fixed shaft 52 has an initial position and an extreme position for axial movement along the fixed hole 511; when the fixed shaft 52 is in the initial position, the upper end of the fixed shaft 52 is flush with the outer wall of the rotating sleeve 51, and when the fixed shaft 52 is clamped in the extreme position, the fixed shaft 52 is completely inside the fixed groove 53; only when all the fixed shafts 52 are in the extreme position, the rotating sleeve 51 can rotate around the main valve body 10 to achieve the function of adjusting the sampling angle. Furthermore, a blocking wire 512 is provided on the inner wall of the fixing hole 511 to limit the fixing shaft 52 and prevent the fixing shaft 52 from falling out of the fixing hole 511 .

[0052] Preferably, if Figure 2 , Figure 6 and Figure 8 As shown, the opening of the sampling angle adjustment mechanism 50 can be completed by using the fixed shaft special tool 70. The staff aligns the action shaft 71 of the fixed shaft special tool 70 with the fixed shafts 511 on both sides of the rotating sleeve 5, and rotates the circular valves at the rear end of the action shaft 71 to move the action shafts 71 on both sides toward the center. When the action shafts 71 on both sides are pressed against the fixed shaft 52, the fixed shaft 52 reaches the limit state. At this time, the upper surface of the fixed shaft 52 is lower than the lower edge of the inner wall of the rotating sleeve 51. The rotating sleeve 51 and the sampling valve body 20 can be rotated by the handle of the fixed shaft special tool 70 to adjust the sampling horizontal angle.

[0053] Preferably, if Figure 1 As shown, the lower end of the sampling valve core 21 is provided with a mounting thread 14 adapted to the pipeline port, so as to facilitate the installation of the wellhead pipeline.

[0054] During specific use, the user installs the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device of this embodiment to the wellhead pipeline through the installation thread 14, which can be used to complete the pressure measurement and sampling work. When the pressure is measured, the user can install the pressure gauge to the pressure gauge seat 11. When the pressure gauge is pressed down, the elastic force of the first reset spring 43 is overcome, so that the sealing valve core 42 falls to make the oil delivery channel 421 and the liquid inlet 13 unblocked. The liquid enters the pressure gauge through the oil delivery channel 421, and the pressure can be measured. After the pressure measurement is completed, the pressure gauge is removed, and the first reset spring 43 is reset to push the sealing valve core 42 to rise. The oil delivery channel 421 is blocked by the inner wall of the main valve body 10 to seal and prevent liquid from spraying out; during sampling, the fixed shaft is used to fix the shaft. The tool 70 and the sampling angle adjustment mechanism 50 are used to adjust the horizontal movement of the sampling valve body 20. After reaching a suitable sampling angle, the sampling valve core 21 is rotated using the sampling valve special tool 60, so that the sampling valve core 21 moves outward along the axial direction of the sampling valve body 20 to reach the maximum horizontal movement range limited by the second limit mechanism 32. At this time, since the opening degree of the sampling port 22 is small and controllable, the liquid cannot be sprayed out. After sampling is completed, the sampling valve core 21 is rotated in the opposite direction using the sampling valve special tool 60, and the sampling port 22 can be closed. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device does not need to be removed after installation. In the event of theft, since the sampling port 22 switch requires the use of the sampling valve special tool 60, the sampling valve core 21 can be rotated, and general tools such as needle-nosed pliers and vises cannot open the sampling port 22; to remove the sleeve 12, it is necessary to loosen the first side limit screw 314 and take out the first steel ball 312 to remove the first limit mechanism 31, otherwise the sleeve 12 cannot be removed; similarly, the complete removal of the sampling valve core 21 requires the removal of the second limit mechanism 32 to achieve the anti-theft function. And due to the restrictions on the use of the sampling valve special tool 60, the occurrence of misoperation by non-professionals can be reduced. In summary, the oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device in this embodiment can achieve a certain anti-blowout and anti-theft effect on the basis of realizing the pressure measurement and sampling function during specific use.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An oil and gas wellhead blowout prevention and theft prevention pressure measurement and sampling device, characterized in that: include: A main valve body (10), the main valve body (10) is in the shape of a hollow column, a pressure gauge seat (11) and a sheath (12) are arranged at the upper end of the main valve body (10), a liquid inlet (13) is arranged at the lower end of the main valve body (10), and the pressure gauge seat (11) is used to install a pressure gauge; An automatic sealing mechanism (40) is arranged inside the main valve body (10) and is movably mounted on the pressure gauge seat (11) along the axial direction of the main valve body (10); the automatic sealing mechanism (40) is used to seal the main valve body (10) when the pressure gauge is removed; The sampling valve body (20) is rotatably connected to and communicates with the main valve body (10) in a horizontal direction through a sampling angle adjustment mechanism (50). Liquid entering the main valve body (10) can enter the sampling valve body (20) through the sampling angle adjustment mechanism (50). A sampling valve core (21) is provided inside the sampling valve body (20). A sampling port (22) is provided on the side of the sampling valve body (20). The sampling valve core (21) moves along the axial direction of the sampling valve body (20) to open or close the sampling port (22). A limiting mechanism (30), the limiting mechanism (30) comprising: a first limiting mechanism (31) and a second limiting mechanism (32), the first limiting mechanism (31) being arranged at a contact surface between a side wall of the main valve body (10) and an inner wall of the sleeve (12), and the second limiting mechanism (32) being arranged at a contact surface between an inner wall of the sampling valve body (20) and an outer wall of the sampling valve core (21); wherein the first limiting mechanism (31) is used to limit the disassembly of the sleeve (12), and the second limiting mechanism (32) is used to limit the disassembly of the sampling valve core (21) and to control the axial movement range of the sampling valve core (21).

2. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 1 is characterized in that: The protective sleeve (12) is sleeved on the upper end of the main valve body (10), and the protective sleeve (12) is used to limit the sampling angle adjustment mechanism (50) along the axial direction of the main valve body (10).

3. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 1 is characterized in that: The sampling valve core (21) is connected to the sampling valve body (20) by a sampling valve thread (23); the sampling valve core (21) rotates relative to the sampling valve body (20) so that the sampling valve core (21) moves axially along the sampling valve body (20).

4. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 3 is characterized in that: The end of the sampling valve core (21) is provided with a rotating joint (211), and the rotating joint (211) is used to cooperate with an external sampling valve dedicated tool (60) to rotate the sampling valve core (21).

5. The oil and gas wellhead blowout prevention and theft prevention pressure measurement and sampling device according to claim 1 is characterized in that: The first limiting mechanism (31) comprises: a first limiting groove (311), a first steel ball (312), a first limiting hole (313), and a first limiting screw (314); wherein the first limiting groove (311) is an annular groove, and the first limiting groove (311) is arranged on the contact surface between the inner wall of the sleeve (12) and the outer wall of the main valve body (10); there are one or more first steel balls (312), and one or more first steel balls (312) are arranged in the first limiting groove (311); the first limiting hole (313) is a columnar hole, and the first limiting hole (313) is horizontally arranged in the outer wall of the sleeve (12) and connected with the first limiting groove (311); the first limiting screw (314) is arranged in the first limiting hole (313).

6. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 1 is characterized in that: The second limiting mechanism (32) comprises: a second limiting groove (321), a second steel ball (322), a second limiting hole (323), and a second limiting screw (324); wherein the second limiting groove (321) is an annular groove; the second limiting groove (321) is arranged on the contact surface between the inner wall of the sampling valve body (20) and the outer wall of the sampling valve core (21); there are one or more second steel balls (322), and one or more second steel balls (322) are arranged in the second limiting groove (321); the second limiting hole (323) is a columnar hole, and the second limiting hole (323) is vertically arranged in the outer wall of the sampling valve body (20) and connected with the second limiting groove (321); the second limiting screw (324) is arranged in the second limiting hole (323).

7. The oil and gas wellhead blowout prevention and theft prevention pressure measurement and sampling device according to claim 1 is characterized in that: The automatic sealing mechanism (40) comprises: A spring seat (41) is arranged at the liquid inlet end of the main valve body (10); A sealing valve core (42) is slidably disposed inside the pressure gauge seat (11) along the axial direction of the main valve body (10), and an oil delivery channel (421) is provided inside the sealing valve core (42); A first return spring (43), fixed to the spring seat (41) and supporting the sealing valve core (42); When the pressure gauge is installed in the pressure gauge seat (11), the sealing valve core (42) is pressed down to overcome the elastic force of the first return spring (43) to open the oil delivery channel; when the pressure gauge is removed from the pressure gauge seat (11), the first return spring (43) drives the sealing valve core (42) to reset to close the oil delivery channel (421).

8. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 1 is characterized in that: The sampling angle adjustment mechanism (50) comprises: a rotating sleeve (51), the rotating sleeve (51) being rotatably sleeved on the main valve body (10), the rotating sleeve (51) being fixedly connected to one end of the sampling valve body (20) and connecting the main valve body (10) and the sampling valve body (20), and a plurality of fixing holes (511) being formed on a side wall of the rotating sleeve (51); A fixed shaft (52), wherein the fixed shaft (52) is multiple, and the multiple fixed shafts (52) are telescopically arranged in the multiple fixing holes (511) in a one-to-one correspondence; A fixing groove (53), wherein there are a plurality of the fixing grooves (53), and the plurality of the fixing grooves (53) are arranged on the outer wall of the main valve body (10) and correspond one-to-one to the fixing holes (511); a second return spring (54), wherein the second return spring (54) is provided in plurality and is sleeved on the plurality of fixed shafts (52) in a one-to-one correspondence, one end of the second return spring (54) abuts against the bottom surface of the fixed hole (511), and the other end of the second return spring (54) is clamped with the fixed shaft (52); Wherein, the fixed shaft (52) has an initial position and an extreme position for axial movement along the fixing hole (511); when the fixed shaft (52) is in the initial position, the outer end of the fixed shaft (52) is flush with the outer wall of the rotating sleeve (51) so as to limit the relative position of the rotating sleeve (51) and the main valve body (10); when the fixed shaft (52) is in the extreme position, the fixed shaft (52) is completely located inside the fixing groove (53) so that the rotating sleeve (51) can rotate around the main valve body (10).

9. The oil and gas wellhead anti-blowout and anti-theft pressure measurement and sampling device according to claim 8 is characterized in that: A blocking wire (512) is provided on the inner wall of the fixing hole (511), and the blocking wire (512) is used to limit the position of the fixing shaft (52) along the axial direction of the fixing hole (511).

10. The oil and gas wellhead blowout prevention and theft prevention pressure measurement and sampling device according to claim 1, characterized in that: The lower end of the main valve body (10) is provided with a mounting thread (14) adapted to the pipeline opening.

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