Drilling fluid high temperature and high pressure filter loss instrument safety slurry cup

Abstract

The utility model relates to the field of petroleum drilling technology, especially point to a kind of drilling fluid high temperature high pressure filter press safety slurry cup, including cup body, the inner wall of cup body is equipped with placing groove, the inside of placing groove is equipped with secondary rubber sealing ring, the top of secondary rubber sealing ring is equipped with secondary metal sealing ring, the inner wall of cup body is equipped with filter screen support surface, the top of filter screen support surface is equipped with filter screen, the top of filter screen is equipped with center compression cover, the edge of center compression cover and the inner wall of cup body middle are equipped with primary rubber sealing ring, primary rubber sealing ring is located in the top of filter screen, the outer wall of center compression cover is fixedly connected with positioning pin, and the number of positioning pin is two, the inner wall of cup body is equipped with positioning pin support surface, two positioning pins are located in the top of positioning pin support surface, the inner wall of cup body is equipped with secondary compression cover with screw thread, the middle part of center compression cover is located in the inside of secondary compression cover. The utility model, it is more simple and convenient to operate, improve the sealing property inside cup body, ensure that sample does not leak, reduce the possibility of rubber ring damage, improve the success rate of experiment.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling, and in particular to a safety slurry cup for a high-temperature and high-pressure drilling fluid filtration meter. Background Technology

[0002] As oil drilling and production wells become deeper, the temperature and pressure faced by downhole drilling fluids are also increasing, leading to higher requirements for the study of the filtration characteristics of drilling fluids under high temperature and high pressure.

[0003] Traditional domestic high-temperature and high-pressure filtration loss analyzers use a single or double cup cap design for the slurry cup. The cup cap has six evenly spaced conical holes around it. The cup cap is fixed to the cup body using a fastening screw that passes through the threaded hole in the cup body. This structure has two disadvantages: it is inconvenient to operate, as the threaded hole in the cup body must be aligned with the conical hole in the cup cap each time, and a certain sequence must be followed to ensure safe tightening; and it poses a significant safety risk, as there have been several incidents where the internal pressure of the slurry cup was not completely released, causing the cup cap and drilling fluid to fly out, which could easily lead to personal injury accidents.

[0004] Another popular sealing structure currently involves placing a rubber ring, a filter screen pressure ring (integrated with the filter screen), filter paper, and another rubber ring into the bottom cover. Two cylindrical pins on the cup body are then aligned with the two openings in the bottom cover and inserted, and finally tightened. The disadvantages of this method include: the cylindrical pins are not easy to tighten, resulting in unstable sealing; and the rubber ring is easily deformed or damaged during the tightening process, leading to a breakdown of the sealing structure. Utility Model Content

[0005] In view of this, the present invention provides a safety slurry cup for a high-temperature and high-pressure drilling fluid filtration meter. The main technical problem to be solved is that the slurry cup of the traditional high-temperature and high-pressure drilling fluid filtration meter in China adopts a single cup cap or double cup cap design, which leads to inconvenience in operation. Each time, it is necessary to align the threaded hole of the cup body with the conical hole of the cup cap. This has caused the internal pressure of the slurry cup to be not completely released, resulting in the cup cap and drilling fluid flying out, which can easily cause personal safety accidents.

[0006] Another sealing structure involves placing a rubber ring, a filter screen pressure ring, filter paper, and another rubber ring in the bottom cover. However, the cylindrical pin is not easy to tighten, resulting in unstable sealing. When forcefully tightening the cylindrical pin, the rubber ring is easily deformed or damaged, leading to the failure of the sealing structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a safety slurry cup for a high-temperature and high-pressure filtration meter for drilling fluid, comprising a cup body, an inner wall of which has a mounting groove, a secondary rubber sealing ring installed inside the mounting groove, a secondary metal sealing ring on top of the secondary rubber sealing ring, a filter screen support surface on the inner wall of the cup body, a filter screen on top of the filter screen support surface, a central pressing cap on top of the filter screen, a primary rubber sealing ring between the edge of the central pressing cap and the inner wall of the cup body, the primary rubber sealing ring being located on top of the filter screen, two positioning pins fixedly connected to the outer wall of the central pressing cap, a positioning pin support surface on the inner wall of the cup body, the two positioning pins being located on top of the positioning pin support surface, a secondary pressing cap threadedly connected to the inner wall of the cup body, the middle part of the central pressing cap being located inside the secondary pressing cap.

[0008] By adopting the above technical solutions, the internal sealing of the cup body is improved.

[0009] As a further description of the above technical solution: The filter screen is located between the cup body and the secondary metal sealing ring, and the cross-section of the secondary metal sealing ring is an inverted triangle.

[0010] By adopting the above technical solution, the secondary metal sealing ring can fit tightly with the secondary rubber sealing ring when compressed, thus achieving a secondary sealing effect.

[0011] As a further description of the above technical solution: The bottom of the central compression cap is provided with a cup lid venting groove, which is located at the edge of the central compression cap.

[0012] By adopting the above technical solution, when there is pressure inside the cup, the residual pressure is released when the lid is forcibly opened, avoiding excessive pressure between the secondary pressing lid and the center lid, and making the adhesion too tight, which facilitates disassembly. When there is still residual pressure inside the cup, the internal pressure will be automatically and quickly released from the vent hole when the cup lid is forcibly opened.

[0013] As a further description of the above technical solution: The outer wall of the cup body is provided with a high-pressure vent, and the high-pressure vent is located on the same side as the vent groove of the cup lid.

[0014] By adopting the above technical solution, after the experiment is completed, it is necessary to loosen the valve stem to release pressure. However, in some cases, the internal pressure of the cup cannot be released or cannot be completely released, and the residual pressure may be dangerous. The pressure relief hole can safely release the residual pressure during disassembly.

[0015] As a further description of the above technical solution: The bottom of the central pressing cap is provided with a cup lid connecting groove, and the top of the central pressing cap is provided with an upper valve stem hole, which is connected to the upper valve stem hole.

[0016] By adopting the above technical solution, the valve stem is directly connected to the center cover, preventing excessive pressure from causing safety hazards.

[0017] As a further description of the above technical solution: The top of the secondary pressing cover is provided with an upper auxiliary opening hole, and there are multiple upper auxiliary opening holes. The outer wall of the secondary pressing cover is provided with a side wall auxiliary opening hole, and there are multiple side wall auxiliary opening holes.

[0018] By adopting the above technical solution, disassembly can be performed with effortless ease using auxiliary tools, even in situations where disassembly is difficult.

[0019] As a further description of the above technical solution: A small hole is provided at the bottom of the inner wall of the cup body, and a lower valve stem opening is provided at the bottom of the cup body. The lower valve stem opening is connected to the interior of the cup body through the small hole.

[0020] By adopting the above technical solution, the lower valve stem is allowed to enter the lower valve stem hole opened at the bottom of the cup body, so as to achieve the function of back pressure ventilation.

[0021] As a further description of the above technical solution: The bottom of the cup is provided with a safety valve, which is located on the left side of the bottom of the cup.

[0022] By adopting the above technical solutions, the safety of the device is improved.

[0023] By employing the above technical solution, the safety slurry cup of the drilling fluid high-temperature and high-pressure filtration analyzer of this utility model has at least the following beneficial effects: 1. Compared with existing technologies, this drilling fluid high-temperature and high-pressure filtration analyzer safety slurry cup, during assembly, first places the secondary rubber sealing ring into the placement groove inside the cup body. The placement groove has a step, and at the top of the step is a small slope. First, place the secondary sealing ring into the sloped step, then place the secondary metal sealing ring. Next, first, place the primary rubber sealing ring on the bottom of the central compression cap, then place the filter screen on the bottom of the central compression cap. At this time, the filter screen is located below the primary rubber sealing ring. The entire central compression cap is placed inside the top of the cup body and locked in place by the positioning pin. Finally, the secondary compression cap is rotated and screwed into the top of the cup body, and the secondary compression cap is placed outside the central compression cap. Ultimately, the secondary compression cap will be tightly pressed against the top of the central compression cap, thereby squeezing the secondary rubber sealing ring, secondary metal sealing ring, primary rubber sealing ring, and filter screen together. The operation is simpler, the internal sealing of the cup body is improved, ensuring that the sample does not leak out, reducing the possibility of damage to the rubber ring, and improving the success rate of the experiment. Attached Figure Description

[0024] Figure 1 This is a first-view overall structural diagram of the safety slurry cup of the drilling fluid high-temperature and high-pressure filtration device proposed in this utility model; Figure 2 This is a schematic diagram of the internal structure of the safety slurry cup of a drilling fluid high-temperature and high-pressure filtration device proposed in this utility model; Figure 3 This utility model proposes a safety slurry cup for a drilling fluid high-temperature and high-pressure filtration meter. Figure 2 Enlarged schematic diagram of structure A in the middle; Figure 4 This is a schematic diagram of the internal structure of the safety slurry cup of a drilling fluid high-temperature and high-pressure filtration device proposed in this utility model; Figure 5 This is a schematic diagram of the secondary sealing upper cup cover structure of the safety slurry cup of the drilling fluid high temperature and high pressure filtration meter proposed in this utility model; Figure 6 This is a schematic diagram of the primary sealing cup cover structure of the safety slurry cup of the drilling fluid high-temperature and high-pressure filtration analyzer proposed in this utility model; Figure 7 This invention relates to a schematic diagram of the upper sealing ring, lower sealing ring, sealing steel ring, and filter screen of a drilling fluid high-temperature and high-pressure filtration device safety slurry cup.

[0025] Legend: 1. Cup body; 2. Placement groove; 3. Secondary rubber sealing ring; 4. Secondary metal sealing ring; 5. Filter screen support surface; 6. Filter screen; 7. Center clamping cap; 8. Primary rubber sealing ring; 9. Positioning pin; 10. Positioning pin support surface; 11. Secondary clamping cap; 12. Cup lid vent groove; 13. High-pressure vent port; 14. Cup lid connecting groove; 15. Upper valve stem hole; 16. Upper auxiliary cap opening hole; 17. Side wall auxiliary cap opening hole; 18. Small hole; 19. Lower valve stem port; 20. Safety valve port. Detailed Implementation

[0026] Reference Figure 1-7 This utility model provides a safety slurry cup for a high-temperature, high-pressure filtration device for drilling fluid: It includes a cup body 1, with an inner wall of the cup body 1 having a mounting groove 2. The mounting groove has a step, and a small inclined surface at the top of the step. A secondary rubber sealing ring 3 is installed inside the mounting groove 2, and a secondary metal sealing ring 4 is positioned on top of the secondary rubber sealing ring 3. A filter screen support surface 5 is provided on the inner wall of the cup body 1, and a filter screen 6 is positioned on top of the filter screen support surface 5. A central pressing cover 7 is positioned on top of the filter screen 6, with the edge of the central pressing cover 7 aligned with... A primary rubber sealing ring 8 is provided in the middle of the inner wall of the cup body 1. The primary rubber sealing ring 8 is located on top of the filter screen 6. A positioning pin 9 is fixedly connected to the outer wall of the central pressing cover 7, and there are two positioning pins 9. A positioning pin support surface 10 is opened on the inner wall of the cup body 1, and the two positioning pins 9 are located on the top of the positioning pin support surface 10. A secondary pressing cover 11 is threaded to the inner wall of the cup body 1. The thread adopts a reverse threading method. The middle part of the central pressing cover 7 is located inside the secondary pressing cover 11. During assembly, the secondary rubber... The sealing ring 3 is placed into the mounting slot 2 inside the cup body 1. The mounting slot 2 has a step with a small slope at the top. First, the secondary sealing ring 3 is placed into the sloped step, followed by the secondary metal sealing ring 4. The bottom outer edge of the secondary metal sealing ring 4 fits against the small slope. Then, the primary rubber sealing ring 8 is placed on the bottom of the central pressing cover 7, followed by the filter screen 6. At this time, the filter screen 6 is located below the primary rubber sealing ring 8. Finally, the entire central pressing cover 7 is placed on top of the cup body 1. Inside the end, the secondary compression cap 11 is rotated and screwed into the top of the cup body 1 and the positioning pin 9 is engaged. The secondary compression cap 11 is then placed over the outside of the central compression cap 7. Ultimately, the secondary compression cap 11 will press tightly against the top of the central compression cap 7, thereby squeezing the secondary rubber sealing ring 3, the secondary metal sealing ring 4, the primary rubber sealing ring 8, and the filter screen 6 together. This makes the operation simpler, improves the sealing of the inside of the cup body 1, ensures that the sample does not leak out, reduces the possibility of damage to the rubber ring, and increases the success rate of the experiment.

[0027] The filter screen 6 is located between the cup body 1 and the secondary metal sealing ring 4. The cross-section of the secondary metal sealing ring 4 is an inverted triangle. When the secondary metal sealing ring 4 is squeezed, it can fit tightly with the secondary rubber sealing ring 8 to achieve a secondary sealing effect.

[0028] The bottom of the central pressing cover 7 is provided with a cup lid vent groove 12, which is located at the edge of the central pressing cover 7. The outer wall of the cup body 1 is provided with a high pressure vent 13, which is located in a position corresponding to the position of the cup lid vent groove 12, to prevent excessive internal pressure from damaging the device.

[0029] The bottom of the central pressing cover 7 is provided with a cup lid connecting groove 14, and the top of the central pressing cover 7 is provided with an upper valve stem hole 15, which is connected to the upper valve stem hole 15. The top of the secondary pressing cover 11 is provided with an upper auxiliary opening hole 16, and there are multiple upper auxiliary opening holes 16. The outer wall of the secondary pressing cover 11 is provided with a side wall auxiliary opening hole 17, and there are multiple side wall auxiliary opening holes 17, which can be used to quickly open the secondary pressing cover 11 with the help of tools.

[0030] A small hole 18 is provided at the bottom of the inner wall of the cup body 1, and a lower valve stem port 19 is provided at the bottom of the cup body 1. The lower valve stem port 19 is connected to the interior of the cup body 1 through the small hole 18. A safety valve port 20 is provided at the bottom of the cup body 1. The safety valve port 20 is located on the left side of the bottom of the cup body 1 to improve the safety of the lifting device.

[0031] Working principle: During assembly, first place the lower sealing ring 5 inside the cup body 1, then place the sealing steel ring 6. Next, first put the upper sealing ring 9 on the bottom of the primary sealing cup lid 7, then put the filter screen 10 on the bottom of the primary sealing cup lid 7. At this time, the filter screen 10 is located below the upper sealing ring 9. Then, put the primary sealing cup lid 7 into the top of the cup body 1. Finally, rotate and screw the secondary sealing cup lid 11 into the top of the cup body 1, and put the secondary sealing cup lid 11 on the outside of the primary sealing cup lid 7. Finally, the secondary sealing cup lid 11 will be tightly pressed against the top of the primary sealing cup lid 7, so that the lower sealing ring 5, sealing steel ring 6, upper sealing ring 9 and filter screen 10 are squeezed together. The operation is simpler, the sealing performance inside the cup body 1 is improved, the sample does not leak out, the possibility of damage to the rubber ring is reduced, and the success rate of the experiment is improved.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety slurry cup for a drilling fluid high-temperature and high-pressure filtration meter, comprising a cup body (1), characterized in that: The inner wall of the cup body (1) is provided with a mounting groove (2), and a secondary rubber sealing ring (3) is installed inside the mounting groove (2). A secondary metal sealing ring (4) is provided on the top of the secondary rubber sealing ring (3). The inner wall of the cup body (1) is provided with a filter screen support surface (5), and a filter screen (6) is provided on the top of the filter screen support surface (5). A central pressing cover (7) is provided on the top of the filter screen (6). A primary rubber sealing ring is provided between the edge of the central pressing cover (7) and the inner wall of the cup body (1). The sealing ring (8) is located at the top of the filter screen (6). The outer wall of the central pressing cover (7) is fixedly connected with a positioning pin (9), and there are two positioning pins (9). The inner wall of the cup body (1) is provided with a positioning pin support surface (10). The two positioning pins (9) are located at the top of the positioning pin support surface (10). The inner wall of the cup body (1) is threadedly connected with a secondary pressing cover (11). The middle part of the central pressing cover (7) is located inside the secondary pressing cover (11).

2. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The filter (6) is located between the cup body (1) and the secondary metal sealing ring (4), and the cross-section of the secondary metal sealing ring (4) is an inverted triangle.

3. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The bottom of the central pressing cover (7) is provided with a cup lid venting groove (12), which is located at the edge of the central pressing cover (7).

4. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 3, characterized in that: The outer wall of the cup body (1) is provided with a high-pressure vent (13), and the position of the high-pressure vent (13) corresponds to the position of the vent groove (12) of the cup lid.

5. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The bottom of the central pressing cover (7) is provided with a cup lid connecting groove (14), and the top of the central pressing cover (7) is provided with an upper valve stem hole (15), which is connected to the upper valve stem hole (15).

6. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The top of the secondary pressing cover (11) is provided with an upper auxiliary opening hole (16), and there are multiple upper auxiliary opening holes (16). The outer wall of the secondary pressing cover (11) is provided with a side wall auxiliary opening hole (17), and there are multiple side wall auxiliary opening holes (17).

7. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The bottom of the inner wall of the cup body (1) is provided with a small hole (18), and the bottom of the cup body (1) is provided with a lower valve stem port (19). The lower valve stem port (19) is connected to the interior of the cup body (1) through the small hole (18).

8. The safety slurry cup of a drilling fluid high-temperature and high-pressure filtration analyzer according to claim 1, characterized in that: The bottom of the cup body (1) is provided with a safety valve port (20), which is located on the left side of the bottom of the cup body (1).

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