Mechanical seal ram assembly for oil and gas drilling

Abstract

The application relates to a mechanical sealing flush pipe assembly for oil and gas drilling, which comprises an upper nut body, a sealing ring assembly, a lower connecting flange, a buffer assembly and a lower nut; the upper nut body is connected to the lower connecting flange through the sealing ring assembly, and the lower connecting flange is slidably connected to the lower nut through the buffer assembly. The beneficial effect is that the lower connecting flange can improve the shock absorption performance of the mechanical sealing flush pipe assembly through the buffer assembly, reduce the impact on the mechanical sealing flush pipe assembly, and further reduce the vibration and impact on the sealing ring assembly, thereby prolonging the service life of the sealing ring assembly.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling technology, and more particularly to a mechanical seal flushing assembly for oil and gas drilling. Background Technology

[0002] The mechanical seal flushing assembly is a crucial component of oil and gas drilling swivels or top drives, used to connect the gooseneck and the center tube, which rotates relative to the gooseneck. The upper end of the mechanical seal flushing assembly connects to the gooseneck, and the lower end connects to the spindle of the swivel or top drive, forming a circulation channel for drilling fluid and simultaneously achieving a rotary seal on the spindle. It is a device that prevents fluid leakage by maintaining contact and relative sliding between a pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, the elastic force of the compensation mechanism, and the cooperation of auxiliary seals, ensuring that the high-pressure mud output from the mud pump can be delivered to the downhole drill bit. The two annular parts in the mechanical seal flushing assembly that are in contact and rotate relative to each other are called sealing rings. To ensure a long service life and good sealing performance of the sealing rings, the selection of sealing ring materials should consider factors such as wear resistance, corrosion resistance, high temperature resistance, good thermal conductivity, high mechanical strength, low coefficient of friction, and self-lubricating properties. Meanwhile, drilling mud, due to its various additives and high temperature and pressure, is corrosive. Engineering ceramics possess excellent chemical stability, high hardness, and wear resistance, making them ideal sealing ring materials for corrosion-resistant mechanical seals. However, engineering ceramics also have disadvantages such as low impact toughness and high brittleness. Furthermore, during oil and gas drilling, the vibrations and impacts generated by the drill bit breaking rocks are transmitted through the drill string to the swivel or top drive, acting on the mechanical seal's flushing assembly and making the sealing rings susceptible to damage.

[0003] Therefore, there is an urgent need for a mechanical seal punch assembly for oil and gas drilling that can reduce the vibration and impact of the sealing ring and has a longer service life. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a mechanical seal flushing assembly for oil and gas drilling, which solves the technical problems of the prior art being unable to reduce the vibration and impact of the sealing ring and having a short service life.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] This invention provides a mechanical seal flushing assembly for oil and gas drilling, comprising an upper nut body, a sealing ring assembly, a lower connecting flange, a buffer assembly, and a lower nut. The upper nut body is connected to the lower connecting flange via the sealing ring assembly, and the lower connecting flange is slidably connected to the lower nut via the buffer assembly.

[0009] Optionally, the buffer assembly includes a bolt and a wave spring. The bolt is partially threaded, with the bolt consisting of a smooth section and a threaded section, and the end being a threaded section. The lower connecting flange has multiple through holes, and the lower nut has multiple threaded blind holes. Each of the through holes corresponds to one of the threaded blind holes. The bolt passes through the through hole, and its threaded end is screwed into the threaded blind hole corresponding to the through hole. The lower connecting flange can slide up and down along the bolt. The wave spring is clamped between the lower connecting flange and the lower nut.

[0010] Optionally, the lower connecting flange includes a flange plate and a flange protrusion connected to the flange plate. The flange plate is connected to the sealing ring assembly; a plurality of through holes are formed on the flange plate and evenly distributed along the circumference of the flange plate; the wave spring is sleeved on the flange protrusion; the flange protrusion extends into the shaft hole of the lower nut; and the outer wall of the flange protrusion is slidably connected to the inner wall of the shaft hole.

[0011] Optionally, a first sealing ring is also installed in the shaft hole, and the first sealing ring is sleeved on the flange protrusion.

[0012] Optionally, the sealing ring assembly includes a first sealing ring and a second sealing ring that are axially mated. The first sealing ring is connected to the bottom of the upper nut body, and the second sealing ring is connected to the top of the lower connecting flange.

[0013] Optionally, the bottom of the upper nut body is provided with a plurality of first mounting blind holes evenly distributed along its circumference, and a downward-facing first connecting pin is inserted into each of the first mounting blind holes. On the outer side of the first sealing ring, a plurality of first mating grooves are evenly distributed along its circumference, and the plurality of first connecting pins are inserted into the plurality of first mating grooves one by one.

[0014] Optionally, the top of the lower connecting flange is provided with a plurality of second mounting blind holes evenly distributed along its circumference, and a second connecting pin is inserted into each of the second mounting blind holes. On the outer side of the second sealing ring, a plurality of second mating grooves are evenly distributed along its circumference, and the plurality of second connecting pins are inserted into the plurality of second mating grooves in a one-to-one correspondence.

[0015] Optionally, the first sealing ring and the second sealing ring have the same structure, and either one includes a ceramic ring located on the radially inner side and a metal ring coupled to the radially outer circumferential surface of the ceramic ring.

[0016] Optionally, a second sealing ring is provided between the lower connecting flange and the sealing ring assembly.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this invention are:

[0019] The present invention provides a mechanical seal punch assembly for oil and gas drilling, wherein the lower connecting flange can improve the shock absorption performance of the mechanical seal punch assembly through a buffer assembly, reduce the impact transmitted to the mechanical seal punch assembly, thereby reducing the vibration and impact on the sealing ring assembly and improving the service life of the sealing ring assembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the mechanical seal punch assembly for oil and gas drilling according to a specific embodiment of the present invention.

[0021] Figure 2 This is an exploded view of the mechanical seal punch assembly for oil and gas drilling according to a specific embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the first sealing ring in a specific embodiment of the present invention.

[0023] [Explanation of Labels in the Attached Image]

[0024] 1: Upper nut body; 21: First sealing ring; 22: Second sealing ring; 3: Lower connecting flange; 41: Bolt; 42: Wave spring; 5: Lower nut; 6: First sealing ring; 7: Second sealing ring. Detailed Implementation

[0025] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0026] like Figure 1 and Figure 2As shown in the figure, a specific embodiment of the present invention provides a mechanical seal flushing assembly for oil and gas drilling, including an upper nut body 1, a sealing ring assembly, a lower connecting flange 3, a buffer assembly, and a lower nut 5. The upper nut body 1 is connected to the lower connecting flange 3 via the sealing ring assembly, and the lower connecting flange 3 is slidably connected to the lower nut 5 via the buffer assembly. The sealing ring assembly includes a first sealing ring 21 and a second sealing ring 22 that are axially joined. The first sealing ring 21 is connected to the bottom of the upper nut body 1, and the second sealing ring 22 is connected to the top of the lower connecting flange 3.

[0027] Specifically, the mechanical seal punch assembly for oil and gas drilling provided in the specific embodiments of the present invention has a lower connecting flange 3 that can improve the shock absorption performance of the mechanical seal punch assembly through a buffer assembly, reduce the impact transmitted to the mechanical seal punch assembly, thereby reducing the vibration and impact on the sealing ring assembly and improving the service life of the sealing ring assembly.

[0028] Furthermore, such as Figure 1 and Figure 2As shown, the buffer assembly includes a bolt 41 and a wave spring 42. The bolt 41 is partially threaded, with the bolt consisting of a smooth section and a threaded section, and the end being a threaded section. The lower connecting flange 3 has multiple through holes, and the lower nut 5 has multiple threaded blind holes. Each through hole corresponds to one of the threaded blind holes. The bolt 41 passes through the through hole, and its threaded end is screwed into the threaded blind hole corresponding to the through hole. The lower connecting flange 3 can slide up and down along the bolt 41. The wave spring 42 is clamped between the lower connecting flange 3 and the lower nut 5. Specifically, the lower connecting flange 3 includes a flange plate and a flange protrusion connected to the flange plate. The flange is connected to the sealing ring assembly. Multiple through holes are opened on the flange and evenly distributed along its circumference. A wave spring 42 is sleeved on the flange protrusion and is located above the lower nut 5, abutting against the top of the lower nut 5. The flange protrusion extends into the shaft hole of the lower nut 5. The outer wall of the flange protrusion is slidably connected to the inner wall of the shaft hole. A first sealing ring 6 is also installed in the shaft hole and is sleeved on the flange protrusion. The first sealing ring 6, together with the shaft hole, achieves a seal between the lower nut 5 and the lower connecting flange 3, preventing leakage of high-temperature and high-pressure slurry flowing between the lower connecting flange 3 and the lower nut 5. A second sealing ring 7 is provided between the lower connecting flange 3 and the sealing ring assembly. Specifically, the second sealing ring 7 is located between the flange and the second sealing ring 22 to prevent leakage of high-temperature and high-pressure slurry between the second sealing ring 22 and the lower connecting flange 3. When the mechanical seal punch assembly is subjected to impact, the force is transmitted to the lower connecting flange 3. The lower connecting flange 3 slides downward, and the flange protrusion of the lower connecting flange 3 slides downward through the shaft hole. The flange slides downward along the bolt 41 until it abuts against and squeezes the wave spring 42. The wave spring 42 undergoes elastic deformation, converting the kinetic energy of the lower connecting flange 3 into the elastic potential energy of the wave spring 42. Then, the wave spring 42 elastically recovers and drives the lower connecting flange 3 to reset, thereby achieving the effect of shock absorption and buffering, reducing the impact and vibration on the sealing ring assembly.

[0029] Furthermore, such as Figure 1 and Figure 2As shown, the bottom of the upper nut body 1 has multiple first mounting blind holes evenly distributed along its circumference, and a downward-facing first connecting pin is inserted into each first mounting blind hole. On the outer side of the first sealing ring 21, multiple first mating grooves are evenly distributed along its circumference, and multiple first connecting pins are inserted into the multiple first mating grooves one-to-one. The top of the lower connecting flange 3 has multiple second mounting blind holes evenly distributed along its circumference, specifically formed on the flange, and a second connecting pin is inserted into each second mounting blind hole. On the outer side of the second sealing ring 22, multiple second mating grooves are evenly distributed along its circumference, and multiple second connecting pins are inserted into the multiple second mating grooves one-to-one. In this specific embodiment, there are three first mounting blind holes and three second mounting blind holes, distributed in a triangle at the bottom of the upper nut body 1 and the top of the lower connecting flange 3. The three first connecting pins and three second connecting pins can respectively fix the first sealing ring 21 and the second sealing ring 22, and can prevent the first sealing ring 21 and the second sealing ring 22 from rotating relative to each other.

[0030] Preferably, such as Figure 3 As shown, the first sealing ring 21 and the second sealing ring 22 have the same structure. Each of them includes a ceramic ring located radially inner and a metal ring bonded to the radially outer circumferential surface of the ceramic ring. The inner ceramic ring ensures sealing and corrosion resistance, while the outer metal ring protects the ceramic ring. A first mating groove is formed on the metal ring of the first sealing ring 21, and a second mating groove is formed on the metal ring of the second sealing ring 22.

[0031] The mechanical seal flushing assembly for oil and gas drilling provided in this invention can be installed on an oil and gas drilling faucet or top drive. For example, the upper nut body 1 can be screwed onto the lower end connector of the gooseneck tube, and the lower nut 5 can be screwed onto the upper end connector of the center tube, thus connecting the gooseneck tube and the center tube. The upper nut body 1, the first sealing ring 21, the second sealing ring 22, the first sealing ring 6, the second sealing ring 7, the lower connecting flange 3, and the lower nut 5 can ensure the sealing effect against high-pressure and high-temperature mud. On this basis, the shock absorption effect of the mechanical seal flushing assembly is improved by the buffer component and by the way the lower connecting flange 3 and the lower nut 5 are slidably connected up and down, thereby reducing the vibration and impact received by the first sealing ring 21 and the second sealing ring 22.

[0032] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mechanical seal punch assembly for oil and gas drilling, characterized in that, It includes an upper nut body (1), a sealing ring assembly, a lower connecting flange (3), a buffer assembly, and a lower nut (5); The upper nut body (1) is connected to the lower connecting flange (3) through a sealing ring assembly, and the lower connecting flange (3) is slidably connected to the lower nut (5) through the buffer assembly. The buffer assembly includes a wave spring (42), which is sandwiched between the lower connecting flange (3) and the lower nut (5); the lower connecting flange (3) includes a flange and a flange protrusion connected to the flange; The flange is connected to the sealing ring assembly; multiple through holes are opened on the flange and are evenly distributed along the circumference of the flange; the wave spring (42) is sleeved on the flange protrusion; the flange protrusion extends into the shaft hole of the lower nut (5); the outer wall of the flange protrusion is slidably connected to the inner wall of the shaft hole. The buffer assembly also includes a bolt (41) that is screwed onto the lower nut (5). When the mechanical seal punch assembly is subjected to impact, the force is transmitted to the lower connecting flange (3). The lower connecting flange (3) slides downward, and the flange protrusion of the lower connecting flange (3) slides downward through the shaft hole. The lower connecting flange (3) slides downward along the bolt (41) until it abuts against and squeezes the wave spring (42). The wave spring (42) undergoes elastic deformation, converting the kinetic energy of the lower connecting flange (3) into the elastic potential energy of the wave spring (42). Then, the wave spring (42) elastically restores and drives the lower connecting flange (3) to reset, thereby achieving the effect of shock absorption and buffering, and reducing the impact and vibration of the sealing ring assembly. The bolt (41) is partially threaded, and the bolt consists of a smooth section and a threaded section, with the end being a threaded section with threads. The lower nut (5) has multiple threaded blind holes, and the multiple through holes correspond one-to-one with the multiple threaded blind holes. The bolt (41) passes through the through hole, and its threaded end is screwed into the threaded blind hole corresponding to the through hole.

2. The mechanical seal flushing assembly for oil and gas drilling as described in claim 1, characterized in that, A first sealing ring (6) is also installed inside the shaft hole, and the first sealing ring (6) is sleeved on the flange protrusion.

3. The mechanical seal flushing assembly for oil and gas drilling as described in claim 1, characterized in that, The sealing ring assembly includes a first sealing ring (21) and a second sealing ring (22) that are axially connected. The first sealing ring (21) is connected to the bottom of the upper nut body (1), and the second sealing ring (22) is connected to the top of the lower connecting flange (3).

4. The mechanical seal flushing assembly for oil and gas drilling as described in claim 3, characterized in that, The bottom of the upper nut body (1) is provided with a plurality of first mounting blind holes evenly distributed along its circumference, and a downward first connecting pin is inserted into each of the first mounting blind holes. On the outer side of the first sealing ring (21), a plurality of first mating grooves are evenly provided along its circumference, and a plurality of first connecting pins are inserted into the plurality of first mating grooves in a corresponding manner.

5. The mechanical seal flushing assembly for oil and gas drilling as described in claim 3, characterized in that, The top of the lower connecting flange (3) is evenly provided with a plurality of second mounting blind holes along its circumference, and a second connecting pin is inserted into each of the second mounting blind holes; On the outer side of the second sealing ring (22), a plurality of second mating grooves are evenly provided along its circumference, and a plurality of second connecting pins are inserted into the plurality of second mating grooves in a corresponding manner.

6. The mechanical seal flushing assembly for oil and gas drilling as described in claim 3, characterized in that, The first sealing ring (21) and the second sealing ring (22) have the same structure, and each of them includes a ceramic ring located on the radially inner side and a metal ring attached to the radially outer circumferential surface of the ceramic ring.

7. The mechanical seal flushing assembly for oil and gas drilling as described in claim 1, characterized in that, A second sealing ring (7) is provided between the lower connecting flange (3) and the sealing ring assembly.

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