Anti-freezing sampler for oil extraction wellhead

Abstract

The utility model relates to the technical field of oil exploitation. The oil extraction wellhead anti-freezing sampler comprises a main body structure, the main body structure comprises a heat preservation shell, a first heat conduction pipe is fixedly connected to the surface of the inner wall of the heat preservation shell, a second heat conduction pipe is fixedly connected to the surface of the top in the first heat conduction pipe, and a quick opening and closing structure is arranged in the second heat conduction pipe. The heat preservation shell communicates with the interior of the outer surface of one side of the lower end of the first heat conduction pipe. By turning on the switch, the electric heating wire can be electrified and emit heat, heat of the electric heating wire is used for preserving heat of crude oil in the first heat conduction pipe through the second heat conduction pipe, and the heat conduction moving rod and the spherical opening and closing plug can be synchronously heated, so that the interiors of the sampling groove and the limiting ring can be synchronously heated; therefore, the interior of the main body structure is insulated, and the sampling groove can be heated.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology; more specifically, it relates to an antifreeze sampler for oil wellheads. Background Technology

[0002] An oil wellhead sampler is a specialized device primarily used to extract oil, gas, and related fluid samples during the production process of an oil well. It is part of the oil production equipment, and its key function is to obtain representative samples for subsequent analysis and evaluation. This not only helps improve oilfield production efficiency but also contributes to environmental protection and resource management.

[0003] Currently, existing oil wellhead samplers suffer from several drawbacks during operation. Most use ordinary or manual valves with slow opening and closing speeds, resulting in prolonged exposure of crude oil to low temperatures. This leads to localized solidification or decreased fluidity, affecting sampling efficiency and sample quality, and ultimately reducing the equipment's practicality. While existing equipment offers some insulation, crude oil remains exposed to low temperatures after flowing out of the device during sampling, causing decreased fluidity and even clogging of the sampling port. This fails to effectively prevent solidification due to a sudden temperature drop during sampling, further diminishing the equipment's usability. Therefore, a new antifreeze sampler for oil wellheads is urgently needed to address these issues. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an antifreeze sampler for oil wellheads to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: an antifreeze sampler for oil wellheads, comprising:

[0006] The main structure includes an insulation shell, with a first heat-conducting pipe fixedly connected to the inner wall surface of the insulation shell, and a second heat-conducting pipe fixedly connected to the top surface inside the first heat-conducting pipe. The second heat-conducting pipe is equipped with a quick-opening and closing structure. An oil drain pipe is connected to the inner surface of the outer surface of the lower end of the insulation shell and the first heat-conducting pipe, and a ball valve is installed inside the oil drain pipe. The bottom surface of the insulation shell is equipped with a connecting auxiliary structure, and a switch is installed on the outer surface of the upper end of the insulation shell.

[0007] The quick-opening and closing structure includes a heat-conducting moving rod, which is inserted into the interior of the second heat-conducting tube. A lifting and rotating handle is fixedly connected to the outer surface of the top end of the heat-conducting moving rod. The diameter of the heat-conducting moving rod is adapted to the inner diameter of the second heat-conducting tube. A positioning block is fixedly connected to the outer surface of the heat-conducting moving rod, and a spherical opening and closing plug is fixedly connected to the outer surface of the bottom of the heat-conducting moving rod. The diameter of the spherical opening and closing plug is larger than the diameter of the heat-conducting moving rod.

[0008] The connection auxiliary structure includes a connection block, which is fixedly connected to the outer surface of the bottom of the insulation shell.

[0009] Preferably, the main structure further includes a sliding groove, which is formed inside the inner wall surface of the upper end of the second heat-conducting pipe. A first positioning groove is formed inside the lower end of the sliding groove on the inner wall surface of the second heat-conducting pipe, and a second positioning groove is formed inside the upper end of the sliding groove on the inner wall surface of the second heat-conducting pipe. An electric heating wire is installed inside the second heat-conducting pipe and is electrically connected to a switch. The positioning block is engaged and slidably connected inside the sliding groove, the first positioning groove, and the second positioning groove. The first heat-conducting pipe is made of aluminum. This design allows the positioning block to move inside the sliding groove, the first positioning groove, and the second positioning groove.

[0010] Preferably, the outer diameter of the positioning block is the same as the inner width of the sliding groove and the inner height of the first and second positioning grooves. This design makes the positioning block more stable when it moves inside the sliding groove, the first positioning groove and the second positioning groove, and avoids the positioning block from leaving the sliding groove, the first positioning groove and the second positioning groove during movement.

[0011] Preferably, there is a gap between the bottom surface of the second heat-conducting pipe and the bottom surface of the interior of the insulation shell. This design allows crude oil to enter the interior of the first heat-conducting pipe through the gap for storage, thereby enabling crude oil sampling.

[0012] Preferably, the connecting auxiliary structure further includes a fixing nut, which is fixedly connected to the outer surface of the lower end of the connecting block. A sampling groove is provided inside the middle position of the connecting block. A limiting ring is fixedly connected to the inner wall surface of the upper end of the sampling groove. An oil inlet hole is provided inside the limiting ring, and multiple sets of oil inlets are provided. The outer surface of the spherical opening and closing plug is inserted into the sampling groove. This design allows the spherical opening and closing plug to move upward or downward inside the sampling groove, and the limiting ring limits the upward movement of the spherical opening and closing plug.

[0013] Preferably, the diameter of the spherical opening and closing plug is adapted to the inner diameter of the sampling groove, and the outer surface of the spherical opening and closing plug is in contact with the inner wall surface of the limiting ring. This design makes it difficult for the spherical opening and closing plug to deviate from its position when it moves inside the sampling groove.

[0014] The technical effects and advantages of this utility model are as follows: By pulling or pushing the rotating handle, the heat-conducting moving rod moves upward or downward inside the second heat-conducting pipe and the limiting ring, and drives the positioning block to move synchronously inside the sliding groove. Then, by rotating and pulling the rotating handle, the positioning block is engaged inside the first or second positioning groove. Thus, the oil inlet can be closed or opened by the ball-shaped opening and closing plug. The opening and closing speed is fast, which avoids the crude oil being exposed to the low temperature environment for a long time during the sampling process, resulting in local solidification or decreased fluidity. This can avoid situations that affect the sampling efficiency and sample quality, and improve the practicality of the equipment to a certain extent.

[0015] By turning on the switch, the heating wire is energized and heats up. The heat from the heating wire is then used to insulate the crude oil inside the first heat pipe through the second heat pipe. Simultaneously, the heat-conducting moving rod and the ball-shaped opening and closing plug are heated, thus simultaneously heating the sampling tank and the limiting ring. This insulates the interior of the main structure and heats the sampling tank, preventing the crude oil from being exposed to a low-temperature environment after flowing out of the equipment, which could lead to decreased fluidity or even blockage. This improves the practicality of the equipment to a certain extent. Moreover, its overall structure is simple and reasonable in design, highly practical, and easy to promote and apply. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is an exploded three-dimensional structural diagram of the main structure of this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the quick-opening and closing structure of this utility model.

[0019] Figure 4 This is an exploded three-dimensional structural diagram of the connecting auxiliary structure of this utility model.

[0020] The attached diagram is labeled as follows: 1. Main structure; 11. Insulation shell; 12. First heat conduction pipe; 13. Second heat conduction pipe; 14. Sliding groove; 15. First positioning groove; 16. Second positioning groove; 17. Heating wire; 2. Quick opening and closing structure; 21. Heat conduction moving rod; 22. Lifting and rotating handle; 23. Positioning block; 24. Spherical opening and closing plug; 3. Oil drain pipe; 4. Spherical valve; 5. Connecting auxiliary structure; 51. Connecting block; 52. Fixing nut; 53. Sampling groove; 54. Limiting ring; 55. Oil inlet; 6. Switch. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The oil extraction involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example 1

[0023] like Figures 1-4 As shown in the figure, this embodiment proposes an antifreeze sampler for oil wellheads, comprising:

[0024] The main structure 1 includes a heat insulation shell 11, and a first heat conduction pipe 12 is fixedly connected to the inner wall surface of the heat insulation shell 11. A second heat conduction pipe 13 is fixedly connected to the top surface inside the first heat conduction pipe 12. A quick opening and closing structure 2 is provided inside the second heat conduction pipe 13. An oil drain pipe 3 is connected to the inner surface of the lower end of the heat insulation shell 11 and the outer surface of the first heat conduction pipe 12. A ball valve 4 is provided inside the oil drain pipe 3. A connecting auxiliary structure 5 is provided on the bottom surface of the heat insulation shell 11. A switch 6 is installed on the outer surface of the upper end of the heat insulation shell 11.

[0025] The main structure 1 also includes a sliding groove 14, which is formed inside the inner wall surface of the upper end of the second heat-conducting pipe 13. A first positioning groove 15 is formed inside the lower end of the sliding groove 14 on the inner wall surface of the second heat-conducting pipe 13, and a second positioning groove 16 is formed inside the upper end of the sliding groove 14 on the inner wall surface of the second heat-conducting pipe 13. A heating wire 17 is installed inside the second heat-conducting pipe 13, and the heating wire 17 is electrically connected to the switch 6. The positioning block 23 is engaged and slidably connected inside the sliding groove 14, the first positioning groove 15, and the second positioning groove 16. The tube 12 is made of aluminum. There is a gap between the bottom surface of the second heat pipe 13 and the bottom surface of the inner part of the insulation shell 11. This design makes the equipment more affordable and easier to use because the material of the first heat pipe 12 itself is inexpensive, lightweight and has good corrosion resistance. At the same time, this design starts the heating wire 17 to heat up by turning on the switch 6. The heat emitted by the heating wire 17 is evenly distributed inside the first heat pipe 12 by the good thermal conductivity of the material of the first heat pipe 12 itself, thereby keeping the crude oil inside the first heat pipe 12 warm.

[0026] The quick-opening and closing structure 2 includes a heat-conducting moving rod 21, which is inserted into the second heat-conducting pipe 13. A lifting and rotating handle 22 is fixedly connected to the outer surface of the top end of the heat-conducting moving rod 21. The diameter of the heat-conducting moving rod 21 matches the inner diameter of the second heat-conducting pipe 13. A positioning block 23 is fixedly connected to the outer surface of the heat-conducting moving rod 21, and a spherical opening and closing plug 24 is fixedly connected to the outer surface of the bottom of the heat-conducting moving rod 21. The diameter of the spherical opening and closing plug 24 is larger than the diameter of the heat-conducting moving rod 21. The outer diameter of the positioning block 23 is the same as the width of the sliding groove 14 and the height of the first positioning groove 15 and the second positioning groove 16. This design allows the heat-conducting moving rod 21 to move upwards or downwards within the second heat-conducting pipe 13 and the limiting ring 54. This design allows the spherical opening and closing plug 24 to move downwards. The quick-opening and closing structure 2 moves downwards, allowing crude oil to enter the inlet hole 55 through the gap between the spherical opening and closing plug 24 and the sampling groove 53, and thus into the first heat-conducting pipe 12. This design allows the positioning block 23 to move within the sliding groove 14, the first positioning groove 15, and the second positioning groove 16. When the positioning block 23 is inside the first positioning groove 15, the quick-opening and closing structure 2 moves downwards as a whole, causing the spherical opening and closing plug 24 to disengage from the sampling groove 53, thus allowing crude oil to be sampled from the wellhead as needed. When the positioning block 23 is inside the second positioning groove 16, the quick-opening and closing structure 2 moves upwards as a whole, causing the spherical opening and closing plug 24 to be inserted into the sampling groove 53, and causing the outer surface of the upper end of the spherical opening and closing plug 24 to adhere to the inside of the limiting ring 54, thereby closing multiple sets of inlet holes 55, thus allowing for rapid sampling of crude oil from the wellhead.

[0027] Example 2

[0028] like Figure 3 and Figure 4 As shown, based on the same concept as the above embodiments, this embodiment also proposes:

[0029] The connecting auxiliary structure 5 includes a connecting block 51, which is fixedly connected to the outer surface of the bottom of the heat insulation shell 11. The connecting auxiliary structure 5 also includes a fixing nut 52, which is fixedly connected to the outer surface of the lower end of the connecting block 51. A sampling groove 53 is provided inside the middle position of the connecting block 51. A limiting ring 54 is fixedly connected to the inner wall surface of the upper end of the sampling groove 53. An oil inlet hole 55 is provided inside the limiting ring 54. Multiple sets of oil inlets 55 are provided. The outer surface of the ball-shaped opening and closing plug 24 is inserted into the inside of the sampling groove 53. This design allows the fixing nut 52 to be installed at the wellhead of the required sampling position by rotating the fixing nut 52. This allows the crude oil inside the wellhead to enter the inside of the sampling groove 53 from the inside of the fixing nut 52 and enter the inside of the first heat conduction pipe 12 through the oil inlet hole 55.

[0030] The diameter of the spherical opening and closing plug 24 is matched with the inner diameter of the sampling groove 53, and the outer surface of the spherical opening and closing plug 24 is in contact with the inner wall surface of the limiting ring 54. This design allows the spherical opening and closing plug 24 to move synchronously inside the sampling groove 53 when the heat-conducting moving rod 21 moves up and down inside the limiting ring 54. As a result, the outer surface of the upper end of the spherical opening and closing plug 24 is in contact with the inside of the limiting ring 54, thereby closing or opening multiple sets of oil inlet holes 55.

[0031] Working principle: When using the equipment, first place the equipment in a suitable position, and rotate the fixing nut 52 to connect the fixing nut 52 to the position of the oil wellhead corresponding to the required sampling. Then, turn on the switch 6 to start the heating wire 17 to heat up, and conduct the heat through the second heat conduction pipe 13 to the inside of the first heat conduction pipe 12 and the quick-opening and closing structure 2. At this time, by moving the heat conduction moving rod 21 downward, the positioning block 23 moves synchronously inside the sliding groove 14, and the heat conduction moving rod 21 moves synchronously inside the limiting ring 54, and the ball opening and closing plug 24 is disengaged from the inside of the sampling groove 53. Then, by rotating and pulling the rotating handle 22, the positioning block 23 is inserted into the inside of the first positioning groove 15, thereby keeping the ball opening and closing plug 24 detached from the inside of the sampling groove 53. At this time, crude oil can enter the inside of multiple sets of oil inlet holes 55 through the gap between the heat conduction moving rod 21 and the sampling groove 53, and finally enter the inside of the first heat conduction pipe 12. After the heat pipe 12 is filled, the positioning block 23 can be disengaged from the first positioning groove 15 by rotating and pulling the handle 22 in the opposite direction. At the same time, the heat-conducting moving rod 21 moves upward inside the second heat pipe 13 and the limiting ring 54. As a result, the spherical opening and closing plug 24 moves into the sampling groove 53 and the outer surface of the upper end of the spherical opening and closing plug 24 is attached to the inside of the limiting ring 54, thereby sealing the oil inlet 55 and preventing crude oil leakage after sampling. The handle 22 can be rotated and pulled again to insert the positioning block 23 into the second positioning groove 16, so that the spherical opening and closing plug 24 is kept attached to the inside of the limiting ring 54. During the sampling process, the heating wire 17 continues to heat up, thereby preventing the sampling hole from being blocked due to low temperature. The sampling operation can be completed in a short time, reducing the time that the crude oil is exposed to the low temperature environment and avoiding decreased fluidity or local solidification. Meanwhile, the heating effect of the heating wire 17 ensures that the temperature inside the equipment and the sampling tank 53 is always higher than the pour point of the crude oil, further ensuring the accuracy and efficiency of sampling, thereby reducing the sampling time of the equipment. It is relatively simple and convenient. When it is necessary to remove the crude oil inside the first heat conduction pipe 12, the ball valve 4 can be rotated so that the crude oil can be discharged out through the oil drain pipe 3, thereby allowing the crude oil to be tested. The above is the complete working principle of this utility model.

[0032] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0033] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0034] In conclusion, the above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An antifreeze sampler for oil wellheads, characterized in that, include: The main structure (1) includes a heat insulation shell (11), and a first heat conduction pipe (12) is fixedly connected to the inner wall surface of the heat insulation shell (11), and a second heat conduction pipe (13) is fixedly connected to the top surface inside the first heat conduction pipe (12). A quick opening and closing structure (2) is provided inside the second heat conduction pipe (13). An oil drain pipe (3) is connected to the inner surface of the outer side of the lower end of the heat insulation shell (11) and the first heat conduction pipe (12). A ball valve (4) is provided inside the oil drain pipe (3). A connecting auxiliary structure (5) is provided on the bottom surface of the heat insulation shell (11). A switch (6) is installed on the outer surface of the upper end of the heat insulation shell (11). The quick-opening and closing structure (2) includes a heat-conducting moving rod (21), which is inserted into the interior of the second heat-conducting pipe (13). A lifting and rotating handle (22) is fixedly connected to the outer surface of the top end of the heat-conducting moving rod (21). The diameter of the heat-conducting moving rod (21) is adapted to the diameter of the interior of the second heat-conducting pipe (13). A positioning block (23) is fixedly connected to the outer surface of the heat-conducting moving rod (21). A spherical opening and closing plug (24) is fixedly connected to the outer surface of the bottom of the heat-conducting moving rod (21). The diameter of the spherical opening and closing plug (24) is larger than the diameter of the heat-conducting moving rod (21). The connection auxiliary structure (5) includes a connection block (51), and the connection block (51) is fixedly connected to the outer surface of the bottom of the heat insulation shell (11).

2. An anti-freezing sampler for oil production wellhead according to claim 1, characterized in that: The main structure (1) also includes a sliding groove (14), and the sliding groove (14) is opened inside the inner wall surface of the upper end of the second heat-conducting pipe (13). A first positioning groove (15) is opened inside the lower end of the sliding groove (14) on the inner wall surface of the second heat-conducting pipe (13), and a second positioning groove (16) is opened inside the upper end of the sliding groove (14) on the inner wall surface of the second heat-conducting pipe (13). An electric heating wire (17) is installed inside the second heat-conducting pipe (13), and the electric heating wire (17) is electrically connected to the switch (6). The positioning block (23) is engaged and slidably connected inside the sliding groove (14), the first positioning groove (15) and the second positioning groove (16). The first heat-conducting pipe (12) is made of aluminum.

3. An anti-freeze sampler for oil production wellheads according to claim 2, characterized in that: The outer diameter of the positioning block (23) is the same as the inner width of the sliding groove (14) and the inner height of the first positioning groove (15) and the second positioning groove (16).

4. The freeze-proof sampler for oil production wellhead according to claim 1, characterized in that: There is a gap between the bottom surface of the second heat pipe (13) and the bottom surface inside the heat insulation shell (11).

5. The freeze-proof sampler for oil production wellheads according to claim 1, characterized in that: The connecting auxiliary structure (5) also includes a fixing nut (52), which is fixedly connected to the outer surface of the lower end of the connecting block (51). A sampling groove (53) is provided inside the middle position of the connecting block (51). A limiting ring (54) is fixedly connected to the inner wall surface of the upper end of the sampling groove (53). An oil inlet hole (55) is provided inside the limiting ring (54), and multiple sets of oil inlets (55) are provided. The outer surface of the spherical opening and closing plug (24) is inserted into the inside of the sampling groove (53).

6. An anti-freeze sampler for oil production wellheads according to claim 5, characterized in that: The diameter of the spherical opening and closing plug (24) is adapted to the inner diameter of the sampling groove (53), and the outer surface of the spherical opening and closing plug (24) is in contact with the inner wall surface of the limiting ring (54).

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