Anti-freezing and anti-blocking pressure gauge buffer

Abstract

The utility model discloses an anti-freezing and anti-blocking pressure gauge buffer, and relates to the technical field of pressure gauge buffers. The anti-freezing and anti-blocking pressure gauge buffer comprises a buffer body, the buffer body is installed at the top of a gas production tree, the bottom end of the buffer body is inserted into the gas production tree, the bottom end of the buffer body is provided with an upwards-sunken installation groove, and the top of the buffer body is connected with a pressure gauge; a hollow buffer pipe body is arranged in the mounting groove, an opening is formed in the side, away from the oil cavity, of the buffer pipe body, the buffer pipe body is attached to the inner side wall of the buffer main body, a temperature conducting body is inserted into the buffer pipe body in a penetrating mode, the temperature conducting body is attached to the inner side wall of the mounting groove, and the temperature conducting body is attached to the buffer pipe body; an annular pressing cap is arranged on the side, away from the buffer pipe body, of the temperature conducting body, the pressing cap is attached to the inner side wall of the mounting groove, a pressing ring is arranged in the pressing cap, and the temperature conducting cavity communicates with the interior of the gas production tree through the pressing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure gauge buffers, in particular to an anti-freezing and blocking pressure gauge buffer. Background Art

[0002] In the process of oil and gas field development, a pressure gauge is used at the wellhead Christmas tree or gas tree to detect the pressure inside the oil well and gas well, so the pressure gauge needs to be in direct contact with the medium in the well to accurately read the pressure; and because the wellhead may be opened and closed, the pressure in the well is relatively high. If there is no pressure gauge buffer, the high pressure change in the well will suddenly impact the detection element of the pressure gauge, which may cause damage to the pressure gauge. Therefore, it is necessary to add a buffer in front of the pressure gauge to buffer the rapid change of pressure, so that the pressure increases and decreases slowly, which can increase the service life of the pressure gauge. However, since the Christmas trees are placed in the open air, they will be affected by the ambient temperature, and the medium in the well contains water. In a low temperature environment, it is easy to form ice around the pressure gauge buffer, thereby blocking the pressure transmission channel of the pressure gauge, so the pressure gauge cannot read the pressure in the well. Utility Model Content

[0003] To this end, an embodiment of the utility model provides an anti-freezing and blocking pressure gauge buffer to solve the problems existing in the above-mentioned technology.

[0004] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0005] An anti-freezing and blocking pressure gauge buffer comprises a buffer body, the buffer body is installed on the top of a gas tree, the bottom end of the buffer body is inserted into the gas tree, the bottom end of the buffer body is provided with an upwardly concave mounting groove, and the top of the buffer body is connected to a pressure gauge;

[0006] A hollow buffer tube body is arranged in the installation groove, and the side of the buffer tube body away from the oil cavity is open, and the buffer tube body is fitted with the inner wall of the buffer body. A temperature conductor is inserted through the buffer tube body, and the temperature conductor is fitted with the inner wall of the installation groove, and the temperature conductor is fitted with the buffer tube body. An annular pressure cap is arranged on the side of the temperature conductor away from the buffer tube body, and the pressure cap is fitted with the inner wall of the installation groove. A pressure ring is arranged in the pressure cap, and the temperature conduction cavity is connected to the inside of the gas production tree through the pressure ring.

[0007] Optionally, an oil cavity is provided inside the buffer body, the bottom of the oil cavity is connected to the mounting groove, the top of the oil cavity is connected to the pressure gauge, a gap is provided between one end of the temperature conductor penetrating the buffer tube body and the side wall of the mounting groove for medium to enter the oil cavity, a buffer cavity is provided between the temperature conductor and the inner wall of the buffer tube body, a sealing cover is provided on the outer wall of the temperature conductor extending outward, the sealing cover is adapted to the side wall of the buffer tube body to seal the buffer cavity, a buffer conduit connecting the buffer cavity and the gap is provided in the buffer tube body, a reflux hole connecting the inside and outside of the buffer cavity is provided on the sealing cover, the inner wall of the pressure cap on the side away from the sealing cover extends inward to form a stepped structure, the pressure ring is fitted with the stepped structure and forms a gap with the inner wall of the pressure cap, the gap is connected to the buffer cavity through the reflux hole, the side wall of the pressure ring is provided with a filter hole penetrating its side wall, a filter screen is provided in the filter hole;

[0008] A pressure-guiding piston is arranged in the oil cavity, and the pressure-guiding piston is sealingly and slidably arranged with the side wall of the oil cavity.

[0009] Optionally, the filtering hole is an annular hole arranged on the circumference of the pressure ring.

[0010] Optionally, a filter protection frame is provided on the outside of the filter, the filter protection frame is fixedly connected to the outer wall of the pressure ring, the filter protection frame is used to protect the filter, and a plurality of slots are evenly opened on the circumference of the filter protection frame.

[0011] Optionally, a pressure relief channel connecting the gap between the temperature conductor and the buffer body mounting groove is provided inside the buffer body, the pressure relief channel is connected to the outside of the buffer body, and a pressure relief valve is provided at the channel opening of the pressure relief channel for controlling the opening and closing of the pressure relief channel.

[0012] Optionally, a first O-ring is provided between the pressure-guiding piston and the side wall of the oil chamber.

[0013] Optionally, a second O-ring is provided between the location where the heat conducting body passes through the buffer tube body and the buffer tube body.

[0014] Optionally, a third O-ring is provided between the pressure cap and the pressure ring.

[0015] Optionally, the pressure cap is threadedly connected to the mounting groove of the buffer body, and the pressure ring is threadedly connected to the temperature conductor.

[0016] Optionally, the pressure relief valve is threadedly connected to the pressure relief channel of the buffer body.

[0017] The utility model has at least the following beneficial effects:

[0018] The utility model installs a buffer body on the top of the gas production tree, and installs a buffer tube body and a heat conductor in the installation groove at the bottom of the buffer body. The heat conductor cavity inside the heat conductor is connected with the gas production tree. The medium just out of the well from the gas production tree has a relatively high temperature, so the temperature is transferred to the buffer cavity through the residual temperature in the heat conductor cavity, so as to prevent the liquid water in the buffer tank from freezing and clogging the buffer tube.

[0019] Through the pressure-conducting piston arranged inside the oil chamber of the buffer body, the pressure in the gas well enters the buffer chamber from the reflux hole through the temperature-conducting chamber, and after passing through the buffer duct in the buffer chamber, it passes through the gap between the temperature-conducting buffer bodies and enters the oil chamber, pushing the silicone oil in the oil chamber to drive the pressure-conducting piston to move, and transmit the pressure to the pressure gauge.

[0020] When the pressure gauge needs to be replaced, the pressure relief valve can be opened to release the excess pressure in the cavity from the pressure relief valve, and then the pressure gauge can be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0023] Figure 1 The figure is a schematic diagram of the internal structure of an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Pressure gauge; 2. Buffer body; 3. Copper pad; 4. Pressure-conducting piston; 5. First O-ring; 6. Pressure relief valve; 7. Temperature conductor; 8. Buffer tube; 9. Second O-ring; 10. Pressure ring; 11. Filter; 12. Third O-ring; 13. Pressure cap; 14. Filter protection frame; 15. Gas production tree; 16. Reflux hole; 17. Buffer duct; 18. Pressure relief channel; 19. Oil chamber; 20. Buffer cavity; 21. Temperature conductor cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not have to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0028] In addition, the terms "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization schemes conceived by the present invention.

[0029] like Figure 1 As shown, an anti-freezing and blocking pressure gauge buffer disclosed in the utility model includes a buffer body 2, the buffer body 2 is installed on the top of the gas tree 15, the bottom end of the buffer body 2 is inserted into the gas tree 15, the bottom end of the buffer body 2 is provided with an upwardly concave mounting groove, and the top of the buffer body 2 is connected to the pressure gauge 1;

[0030] A hollow buffer tube body 8 is arranged in the installation groove, and the side of the buffer tube body 8 away from the oil chamber 19 is open, and the buffer tube body 8 is fitted with the inner wall of the buffer body 2. A heat conductor 7 is inserted through the buffer tube body 8, and the heat conductor 7 is fitted with the inner wall of the installation groove, and the heat conductor 7 is fitted with the buffer tube body 8. An annular pressure cap 13 is arranged on the side of the heat conductor 7 away from the buffer tube body 8, and the pressure cap 13 is fitted with the inner wall of the installation groove. A pressure ring 10 is arranged in the pressure cap 13, and the temperature conducting cavity 21 is connected to the inside of the gas production tree 15 through the pressure ring 10.

[0031] The bottom of the buffer body 2 is slightly smaller than the opening size of the top of the gas tree 15, the middle of the buffer body 2 is adapted to the opening size of the top of the gas tree 15, and a pipe thread is provided on the outside thereof to adapt to the inner wall of the gas tree 15, the two are threadedly connected, and the top of the buffer body 2 is connected to the pressure gauge 1;

[0032] The bottom end of the buffer body 2 is recessed upward to form an installation groove for installing the buffer tube body 8 and the heat conductor 7. The buffer tube body 8 is directly placed in the installation groove and fits on the bottom of the installation groove. The buffer tube body 8 is a columnar structure with a hollow interior and an opening. The heat conductor 7 is inserted in the middle of the buffer tube body 8, and the interior of the heat conductor 7 is a hollow heat conductor cavity 21. The size of the heat conductor 7 is smaller than that of the buffer body, and the gap around the buffer body is the buffer cavity 20. The heat conductor cavity 21 of the heat conductor 7 is open and connected to the interior of the bottom gas production tree 15, so that the high-temperature medium extracted from the well by the gas production tree 15 enters the heat conductor cavity 21, and the temperature is transferred to the buffer cavity 20 and the buffer tube body 8 outside it, thereby playing an anti-freeze role.

[0033] Furthermore, an oil chamber 19 is provided inside the buffer body 2, the bottom of the oil chamber 19 is connected to the mounting groove, the top of the oil chamber 19 is connected to the pressure gauge 1, a copper pad 3 is provided on the top of the oil chamber, a gap is provided between the end of the heat conductor 7 that passes through the buffer tube body 8 and the side wall of the mounting groove for the medium to enter the oil chamber 19, a buffer chamber 20 is provided between the heat conductor 7 and the inner wall of the buffer tube body 8, a sealing cover is provided on the outer wall of the heat conductor 7 that extends outward, and the sealing cover is adapted to the side wall of the buffer tube body 8, so as to provide a buffer chamber 20. 0 is sealed, a buffer conduit 17 connecting the buffer cavity 20 and the gap is arranged in the buffer tube body 8, a reflux hole 16 connecting the inside and outside of the buffer cavity 20 is arranged on the sealing cover, the inner wall of the side of the pressure cap 13 away from the sealing cover extends inward to form a stepped structure, the pressure ring 10 is fitted with the stepped structure, and forms a gap with the inner side wall of the pressure cap 13, the gap is connected with the buffer cavity 20 through the reflux hole 16, the side wall of the pressure ring 10 is provided with a filter hole penetrating the side wall thereof, and a filter screen 11 is arranged in the filter hole;

[0034] A pressure-guiding piston 4 is disposed in the oil chamber 19 , and the pressure-guiding piston 4 is sealingly and slidably disposed with the side wall of the oil chamber 19 .

[0035] The oil chamber 19 is arranged inside the upper end of the buffer body 2 and is connected to the pressure gauge 1. A pressure-guiding piston 4 is arranged inside the oil chamber 19. The pressure-guiding piston 4 divides the inside of the oil chamber 19 into two parts, an upper part and an lower part. In order to improve the sealing performance of the pressure-guiding piston 4, a first O-ring 5 is arranged between the pressure-guiding piston 4 and the side wall of the oil chamber 19 (buffer body 2) to prevent the medium from mixing on the upper and lower sides. The upper part of the pressure-guiding piston 4 is filled with low-temperature resistant silicone oil, and the lower part is filled with the medium from the gas tree 15.

[0036] At the connection between the mounting groove and the oil chamber 19, a gradually shrinking conical hole is formed inside the buffer body 2, and the top of the heat conductor 7 is set to be conical. After the heat conductor 7 passes through the buffer tube 8, the gap between the heat conductor 7 and the conical hole is used for the medium to pass through, so as to push the movement of the pressure-conducting piston 4;

[0037] A buffer conduit 17 is disposed inside the buffer cavity 20. The buffer conduit 17 passes through the top of the buffer tube 8 and connects the buffer cavity 20 with the gap through which the medium passes.

[0038] The connection between the heat conducting body 7 and the buffer tube body 8 is as follows: a sealing cover extending outward is formed on the side wall of the heat conducting body 7 (at a distance from the lowermost end of the heat conducting body 7), the sealing cover is completely buckled on the opening of the buffer tube body 8, and fits with the groove wall of the installation groove, and the heat conducting body 7 and the buffer tube body 8 are fixed by a pressing cap 13; after the buffer cavity 20 is sealed by the sealing cover, a reflux hole 16 is formed through the sealing cover to connect the inside and outside of the buffer cavity 20;

[0039] Furthermore, in order to prevent the medium in the buffer cavity 20 from directly flowing into the oil cavity 19, a second O-ring 9 is provided between the temperature conductor 7 and the buffer tube 8 for sealing;

[0040] The lower part of the sealing cover of the temperature conductor 7 is used to sleeve the connecting pressure ring 10. The fixing method between the pressure ring 10 and the temperature conductor 7 is a threaded connection, and the pressure ring 10 is smaller than the size of the pressure cap 13, and there is a gap between the pressure ring 10 and the pressure cap 13. The bottom end of the temperature conductor 7 is open, and the temperature conduction cavity 21 can be connected to the inside of the gas production tree 15. The pressure ring 10 is an annular structure, and its opening can be adapted to the opening of the temperature conduction cavity 21. The pressure ring 10 is installed on the temperature conductor 7, and a through hole is opened on its side wall. The through hole connects the gap between the pressure ring 10 and the pressure cap 13 with the inside of the pressure ring 10 (temperature conduction cavity 21). A filter screen 11 is arranged in the through hole to filter the medium collected from the well by the gas production tree 15;

[0041] The setting of the reflux hole 16 requires that the gap between the pressure ring 10 and the pressure cap 13 be connected to the buffer cavity 20 , that is, the temperature conducting cavity 21 and the buffer cavity 20 be connected.

[0042] The pressure cap 13 is also an annular structure, and its inner diameter (the inner diameter of the step structure formed by shrinking inward at the bottom opening) is adapted to the outer diameter of the pressure ring 10, and its outer diameter is adapted to the inner diameter of the slot of the installation slot, inserted into the installation slot, and threadedly connected to the installation slot;

[0043] A third O-type sealing ring 12 is provided between the pressure ring 10 and the pressure cap 13 to prevent the medium in the gas tree 15 from directly entering the gap between the pressure ring 10 and the pressure cap 13 .

[0044] The pressing cap 13 is threadably connected to the main body to press the buffer tube body 8 and the heat conducting body 7 .

[0045] Furthermore, the filtering hole is a 360° annular hole on the side wall of the pressure ring 10 .

[0046] Furthermore, a filter protection frame 14 is provided on the outside of the filter 11, and the filter protection frame 14 is fixedly connected to the outer wall of the pressure ring 10. The filter protection frame 14 is used to protect the filter 11, and a plurality of strip-shaped slots are opened on the surrounding side of the filter protection frame 14, which are combined with the filter holes on the pressure ring 10, and the slots serve as water outlets.

[0047] The filter screen protection frame 14 is used to reinforce the filter screen 11, and the filter screen 11 is fixed to the pressure ring 10 to prevent the filter screen 11 from being damaged when the medium passes through.

[0048] The buffer body 2 has a pressure relief channel 18 inside that connects the gap between the thermal conductor 7 and the buffer body mounting groove. The pressure relief channel 18 is connected to the outside of the buffer body. A pressure relief valve 6 is provided at the channel opening of the pressure relief channel 18 to control the opening and closing of the pressure relief channel 18.

[0049] The pressure relief valve 6 is threadedly connected to the buffer body 2 and sealed by a conical surface. The pressure can be released by rotating.

[0050] The anti-freezing and blocking pressure gauge 1 buffer solves the problem of freezing of ordinary pressure gauge 1 buffer in low temperature environment. In low temperature environment, pressure gauge 1 can also monitor the pressure in the well in real time. Ordinary pressure gauge 1 buffer needs to be unblocked again after freezing, which not only increases the workload and cost, but also increases the safety hazard of frequent wellhead operations. The anti-freezing and blocking pressure gauge 1 buffer eliminates the possibility of freezing, so it can be used for a long time without maintenance or replacement, saving costs.

[0051] The buffer cavity 20 of the utility model does not store water, and can be discharged from the reflux hole 16;

[0052] The temperature conducting cavity 21 is completely installed inside the pipeline at the top of the Christmas tree, and uses the temperature inside the pipeline to transfer heat to the buffer cavity 20, so that the water in the buffer cavity 20 cannot freeze;

[0053] The position outside the pipeline that cannot conduct heat is adopted to conduct pressure with low-temperature silicone oil. The pressure in the well is transmitted to the silicone oil through a pressure-conducting piston 4, and the silicone oil transmits the pressure to the pressure gauge 1;

[0054] When the pressure gauge 1 needs to be replaced, the excess pressure in the cavity can be released from the pressure relief valve 6, and then the pressure gauge 1 can be replaced.

[0055] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0056] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0057] The above is a relatively specific and detailed description of the utility model through general description and specific embodiments. It should be pointed out that, without departing from the concept of the utility model, it is obvious that several variations and improvements can be made to these specific embodiments, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A buffer for preventing freezing and blocking of a pressure gauge, characterized in that: The buffer body comprises a buffer body, which is installed on the top of the gas tree, the bottom of which is inserted into the gas tree, the bottom of which is provided with an upwardly recessed mounting groove, and the top of which is connected to a pressure gauge; A hollow buffer tube body is arranged in the installation groove, and the side of the buffer tube body away from the oil cavity is open, and the buffer tube body is fitted with the inner wall of the buffer body. A temperature conductor is inserted through the buffer tube body, and the temperature conductor is fitted with the inner wall of the installation groove, and the temperature conductor is fitted with the buffer tube body. An annular pressure cap is arranged on the side of the temperature conductor away from the buffer tube body, and the pressure cap is fitted with the inner wall of the installation groove. A pressure ring is arranged in the pressure cap, and the temperature conduction cavity is connected to the inside of the gas production tree through the pressure ring.

2. The anti-freeze-blocking pressure gauge buffer according to claim 1, characterized in that: An oil cavity is provided inside the buffer body, the bottom of the oil cavity is connected to the mounting groove, the top of the oil cavity is connected to the pressure gauge, a gap is provided between one end of the temperature conductor penetrating the buffer tube body and the side wall of the mounting groove for medium to enter the oil cavity, a buffer cavity is provided between the temperature conductor and the inner wall of the buffer tube body, a sealing cover is provided on the outer wall of the temperature conductor extending outward, the sealing cover is adapted to the side wall of the buffer tube body to seal the buffer cavity, a buffer conduit connecting the buffer cavity and the gap is provided in the buffer tube body, a reflux hole connecting the inside and outside of the buffer cavity is provided on the sealing cover, the inner wall of the pressure cap on one side away from the sealing cover extends inward to form a stepped structure, the pressure ring is fitted with the stepped structure, and a gap is formed with the inner wall of the pressure cap, the gap is connected to the buffer cavity through the reflux hole, the side wall of the pressure ring is provided with a filter hole penetrating its side wall, and a filter screen is provided in the filter hole; A pressure-guiding piston is arranged in the oil cavity, and the pressure-guiding piston is sealingly and slidably arranged with the side wall of the oil cavity.

3. The anti-freeze-blocking pressure gauge buffer according to claim 2, characterized in that: The filtering hole is an annular hole arranged on the peripheral side of the pressure ring.

4. The anti-freeze-blocking pressure gauge buffer according to claim 2, characterized in that: A filter protection frame is arranged outside the filter screen, the filter protection frame is fixedly connected to the outer wall of the pressure ring, the filter protection frame is used to protect the filter screen, and a plurality of slots are evenly arranged around the filter protection frame.

5. The anti-freeze-blocking pressure gauge buffer according to claim 1, characterized in that: The buffer body is provided with a pressure relief channel connecting the gap between the thermal conductor and the buffer body mounting groove inside, the pressure relief channel is connected to the outside of the buffer body, and a pressure relief valve is provided at the channel opening of the pressure relief channel for controlling the opening and closing of the pressure relief channel.

6. The anti-freeze-blocking pressure gauge buffer according to claim 2, characterized in that: A first O-type sealing ring is arranged between the pressure-guiding piston and the side wall of the oil chamber.

7. The anti-freeze-blocking pressure gauge buffer according to claim 1, characterized in that: The heat conducting body penetrates through the buffer tube body and a second O-type sealing ring is arranged between the buffer tube body.

8. The anti-freeze-blocking pressure gauge buffer according to claim 1, characterized in that: A third O-type sealing ring is arranged between the pressure cap and the pressure ring.

9. The anti-freeze-blocking pressure gauge buffer according to claim 1, characterized in that: The pressure cap is threadedly connected to the mounting groove of the buffer body, and the pressure ring is threadedly connected to the temperature conductor.

10. The anti-freeze-blocking pressure gauge buffer according to claim 5, characterized in that: The pressure relief valve is threadedly connected to the pressure relief passage of the buffer body.

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