Multifunctional oil pumping polish rod sealing device for oil pumping well

Abstract

The multifunctional oil pumping polish rod sealing device comprises an oil pumping polish rod, the oil pumping polish rod sequentially penetrates through a conveying wheel, a pressing cylinder, a second sealing cylinder and a first sealing cylinder from top to bottom, and a second sealing cavity and a first pressing cavity are formed in the upper portion and the lower portion of the interior of the second sealing cylinder correspondingly; the top of the first sealing cylinder is in threaded connection with the inner side wall of the first pressing cavity, and the top of the second sealing cylinder is in threaded connection with the inner side wall of the pressing cylinder. The conveying wheel penetrates through the side wall of the top of the pressing cylinder, and the side wall of the outer ring of the conveying wheel is fixedly connected with an outer boss. According to the invention, the spiral strip-shaped sealing packing is uniformly sealed in the axial direction of the polish rod, and during working, the two sealing packing are subjected to secondary sealing in the axial direction of the polish rod under the pressing force, so that the oil leakage of the oil pumping polish rod is effectively solved; and the sealing packing is provided with a rubber matrix which is synergistically enhanced by the nano silicon dioxide and the carbon nanotubes, so that the sealing packing has good wear resistance and sealing performance in oil media such as petroleum.

Description

Technical Field

[0001] The invention relates to the technical field of rubber sealing rings, in particular to a multifunctional oil pumping rod sealing device for an oil pumping well. Background Art

[0002] When the oil wells in the oil field are not under pressure and cannot flow by themselves, they need to be pumped out by pumping machinery. Since the polished rod of the pumping unit generates pressure during the extension and extension process, oil leakage is inevitable, which wastes crude oil resources and causes pollution around the oil well. Therefore, the polished rod must be sealed.

[0003] Existing pumping unit polished rod sealing devices come in a variety of styles. Generally, several rubber seals are cut, staggered, and then inserted into a packing box and compressed to seal the polished rod. However, the swing of the polished rod during operation of the pumping unit causes the rubber seals to wear, leading to oil leakage and inadequate sealing of the polished rod. Summary of the Invention

[0004] The present invention provides a multifunctional oil pumping rod sealing device for an oil pumping well, so as to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A multifunctional oil pumping rod sealing device for an oil pumping well comprises an oil pumping rod, wherein the oil pumping rod is sequentially penetrated from top to bottom by a conveying wheel, a pressure cylinder, a second sealing cylinder, and a first sealing cylinder. A second sealing cavity and a first pressure cavity are respectively provided in the upper and lower parts of the second sealing cylinder. The top of the first sealing cylinder is threadedly connected to the inner side wall of the first pressure cavity, and the top of the second sealing cylinder is threadedly connected to the inner side wall of the pressure cylinder. The conveying wheel passes through the top side wall of the pressing cylinder, and the outer ring side wall of the conveying wheel is fixedly connected with an external boss, and the external boss is against the inner top side wall of the pressing cylinder. The first sealing cavity and the second sealing cavity are both provided with spiral sealing packings, and the two sealing packings are both wound on the sealing packing.

[0006] An internal thread is provided on the side wall of the second pressure chamber inside the pressure cylinder, and an external thread is provided on the top outer side wall of the second sealing cylinder and the first sealing cylinder. The second sealing cylinder is provided with a second sealing chamber and a first pressure chamber on the upper and lower sides respectively. The inner side wall of the first pressure chamber is provided with an internal thread. The top of the first sealing cylinder is threadedly connected to the first pressure chamber, and the top of the second sealing cylinder is threadedly connected to the second pressure chamber. Preferably, a first handle, a second handle, and a third handle that are symmetrically arranged are fixedly connected to the outer side walls of the first sealing cylinder, the second sealing cylinder, and the pressing cylinder, respectively.

[0007] Preferably, an inclined conveying groove is longitudinally provided on the inner side wall of the pressing cylinder, and the inclination angle of the conveying groove is 5-30°.

[0008] Preferably, the bottoms of the second sealed cavity and the first sealed cavity are both in the shape of a frustum tapering downward.

[0009] Preferably, the method for preparing the sealing packing comprises the following steps: Step 1: Add nitrile rubber, nano-silica, carbon nanotubes, antioxidant 4010NA, antioxidant RD, and dioctyl phthalate to an internal mixer in proportion and mix them. Control the temperature of the internal mixer at 80-100°C and mix for 10-15 minutes. Transfer to an open mixer, add dicumyl peroxide, dibenzothiazole disulfide, and thiuram accelerator, and continue mixing for 5-8 minutes. Remove the sheet and set aside. Step 2: Put the refined film and solvent into a mixing tank and stir at room temperature for 30 hours to make a dipping slurry; put the special canvas into the dipping machine for dipping, and dry it for later use; Step 3: Mix the components of the adhesive according to the formula in an internal mixer, control the mixing temperature at 70-90°C, mix for 8-12 minutes, and prepare the sheet for use; Step 4: Dip the high modulus low shrinkage cord into the dipping slurry, arrange it evenly on the yarn drawing machine, attach the dipping canvas and adhesive film to the cord in order and number of layers, and cut it into the required size; Step 5: Form the cut strip material into a V-belt on a forming machine; Step 6: Form the V-belt blank into a spiral shape on a spiral packing machine, wrap it with canvas, and then put it into a vulcanizing tank for pressurized vulcanization at 160-170℃ and 10-15MPa for 10-20 minutes; Step 7: After vulcanization, cool and demould, and pack after inspection.

[0010] Preferably, the mass parts of each raw material in the step 1 are: 100 parts of nitrile rubber, 10-20 parts of nano-silica, 2-5 parts of carbon nanotubes, 2-4 parts of dicumyl peroxide, 0.5-1 part of dibenzothiazole disulfide, 0.2-0.5 parts of thiuram accelerator, 1-2 parts of antioxidant 4010NA, 1-2 parts of antioxidant RD, and 5-10 parts of dioctyl phthalate.

[0011] Preferably, in step 2, the mass ratio of the film to the solvent is 1:(3-5).

[0012] Preferably, the number of layers laminated in step 4 is 3-5 layers, and the impregnated canvas and the adhesive film are laminated alternately.

[0013] Preferably, the canvas coated in step six is a special canvas that has been dipped in glue, and the dipping method is the same as the dipping method of the special canvas in step two.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses spiral-shaped sealing packing to evenly seal the axial direction of the polished rod. When working, the two sealing packings perform secondary sealing in the axial direction of the polished rod under the compression force, effectively solving the oil leakage of the pumping rod; 2. The sealing packing of the present invention has a rubber matrix synergistically reinforced by nano-silicon dioxide and carbon nanotubes, and a reinforcement structure composed of special canvas and high-modulus low-shrinkage cords, and has good wear resistance and sealing performance in oil media such as petroleum.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the following preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the three-dimensional structure of a multifunctional oil pumping rod sealing device for an oil pumping well proposed by the present invention; Figure 2 This is a schematic perspective cross-sectional view of a multifunctional polished rod sealing device for an oil pumping well proposed by the present invention; Figure 3 This is a schematic front cross-sectional structural diagram of a multifunctional oil pumping rod sealing device for an oil pumping well proposed by the present invention; Figure 4 This is a schematic diagram of the explosion structure of a multifunctional polished rod sealing device for oil pumping wells proposed by the present invention; Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the medium-pressure cylinder of the present invention; Figure 6 Schematic diagram of the front cross-sectional structure of the second sealing cylinder in the present invention; Figure 7 Schematic diagram of the front cross-sectional structure of the first sealing cylinder in the present invention; Figure 8 It is a schematic diagram of the front cross-sectional structure of the medium-pressure cylinder of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. First handle; 2. First sealing cylinder; 3. Second sealing cylinder; 4. Second handle; 5. Third handle; 6. Pressure cylinder; 7. Second pressure chamber; 8. Oil extraction rod; 9. Delivery wheel; 10. Sealing packing; 11. External boss; 12. Delivery trough; 13. Second sealing chamber; 14. First pressure chamber; 15. First sealing chamber. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples provided are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not to exact scale, and are only used for the purpose of conveniently and clearly illustrating the embodiments of the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1 See also Figures 1 to 8 In an embodiment of the present invention, a multifunctional oil pumping rod sealing device for an oil pumping well includes an oil pumping rod 8, which is sequentially penetrated by a conveying wheel 9, a pressure cylinder 6, a second sealing cylinder 3, and a first sealing cylinder 2 from top to bottom. A second sealing chamber 13 and a first pressure chamber 14 are respectively provided on the upper and lower parts of the interior of the second sealing cylinder 3. An internal thread is provided on the side wall of the second pressure chamber 7 inside the pressure cylinder 6. External threads are provided on the top outer walls of the second sealing cylinder 3 and the first sealing cylinder 2. A second sealing chamber 13 and a first pressure chamber 14 are respectively provided on the upper and lower parts of the interior of the second sealing cylinder 3. An internal thread is provided on the inner side wall of the first pressure chamber 14. The top of the first sealing cylinder 2 is threadedly connected to the first pressure chamber 14, and the top of the second sealing cylinder 3 is threadedly connected to the second pressure chamber 7 of the pressure cylinder 6. The conveying wheel 9 passes through the top side wall of the pressing cylinder 6. The outer ring side wall of the conveying wheel 9 is fixedly connected with an external boss 11. The external boss 11 rests on the inner top side wall of the pressing cylinder 6. The bottom of the second sealing cavity 13 and the first sealing cavity 15 are both frustum-shaped and taper downward. The first sealing cavity 15 and the second sealing cavity 13 are both provided with a spiral sealing packing 10. The two sealing packings 10 are both wound on the sealing packing 10. The outer side walls of the first sealing cylinder 2, the second sealing cylinder 3 and the pressing cylinder 6 are respectively fixedly connected with a symmetrically arranged first handle 1, a second handle 4 and a third handle 5.

[0022] The working principle of the present invention is: When in use, first coil the two 10s around 8, then place the two 10s into 13 and 15 respectively, then thread 2 and 3 together to compress 10 in 2, thread 6 and the top of 3 together, and use 6 to drive 9 to compress 10 in 3. Through the secondary seal, 8 is effectively sealed.

[0023] Example 2 An inclined conveying groove 12 is longitudinally provided on the inner side wall of the pressing cylinder 6. The inclination angle of the conveying groove 12 is 5-30°. Through 12, 10 can be extended from 12 to 13 and coiled on 8, and the top of 10 needs to extend out of the outside world from the top of 12. In this way, when 10 needs to be replaced, 10 can be directly pulled out and then extended into 13 along 12, which makes replacement more convenient.

[0024] Example 2 The preparation method of the sealing packing 10 comprises the following steps: Step 1: Rubber mixing and sheeting Nitrile-butadiene rubber, nanosilica, carbon nanotubes, antioxidant 4010NA, antioxidant RD, dioctyl phthalate, and other materials are added to an internal mixer in the specified proportions and mixed. The internal mixer temperature is controlled at 80-100°C for 10-15 minutes to ensure thorough mixing of the materials. The mixed rubber is then transferred to an open mixer, where dicumyl peroxide, dibenzothiazole disulfide, and a thiuram accelerator are added. Mixing is continued for 5-8 minutes to evenly disperse the crosslinker and other additives throughout the rubber. Finally, the rubber is sheeted and set aside.

[0025] The mass proportions of the raw materials are as follows: 100 parts of nitrile rubber, 10-20 parts of nano-silica, 2-5 parts of carbon nanotubes, 2-4 parts of dicumyl peroxide, 0.5-1 parts of dibenzothiazole disulfide, 0.2-0.5 parts of thiuram accelerator, 1-2 parts of antioxidant 4010NA, 1-2 parts of antioxidant RD, and 5-10 parts of dioctyl phthalate. Step 2: Prepare dipping slurry and canvas dipping Cut the refined film into small pieces and add them to a mixing tank with a solvent in a certain ratio. Stir at room temperature for 30 hours to fully dissolve the film and form a uniform impregnation slurry. Then place the special canvas in the impregnation machine and perform the impregnation process, so that the canvas surface is evenly coated with the impregnation slurry. After impregnation, remove the canvas and air dry it for later use. The mass ratio of film to solvent is 1: (3-5). Step 3: Mixing and discharging adhesive Mix the adhesive components according to the recipe in an internal mixer at a temperature of 70-90°C for 8-12 minutes. Once mixed evenly, remove the sheet and set aside.

[0026] Step 4: Wire dipping and patch cutting The high modulus low shrinkage cord is dipped into the dipping slurry to make the surface of the cord evenly coated with a layer of slurry. The dipped cord is then evenly arranged on the drawing machine, and the dipped canvas and adhesive film are laminated on the cord in a certain order and number of layers to form a strip material with a certain thickness and width. Finally, the strip material is cut into the required size using a cutting device. The number of laminated layers is 3-5, and the dipped canvas and adhesive film are laminated alternately. Step 5: V-belt forming The cut strip material is formed into a triangular belt on a forming machine so that it has a triangular cross-section shape to meet the forming requirements of spiral packing.

[0027] Step 6: Spiral packing molding and vulcanization The V-belt blank is formed on a dedicated spiral packing machine to create a spiral structure. The spiral packing is then coated with canvas to enhance its wear resistance and sealing properties. Finally, the wrapped spiral packing is placed in a vulcanizer and pressurized for vulcanization at a temperature of 160-170°C and a pressure of 10-15 MPa for 10-20 minutes. This cross-links the rubber molecular chains, forming a three-dimensional network structure and improving the spiral packing's physical, mechanical, and sealing properties. The coated canvas is a specially impregnated canvas, using the same impregnation method as the special canvas in step two.

[0028] Step 7: Post-processing After the vulcanized spiral packing is removed from the vulcanizing tank, it is cooled to room temperature. It is then demoulded and inspected for appearance quality, dimensional accuracy, and sealing performance. Qualified spiral packings are packaged and stored.

[0029] The sealing packing 10 prepared by the above method has the following advantages: Excellent wear resistance: Nano-silica and carbon nanotubes form a complementary reinforcement structure in the rubber. Nano-silica increases the hardness and rigidity of the rubber, reducing deformation and wear during friction. Carbon nanotubes, with their excellent aspect ratio and mechanical properties, form a three-dimensional network structure, effectively transferring stress and preventing crack propagation, significantly improving the wear resistance of the spiral packing. Excellent oil-resistant sealing performance: The high specific surface area, surface activity, and hydrophobicity of the nanomaterial form a dense barrier in the rubber, preventing the penetration and leakage of oil molecules. At the same time, the reinforcement of the special canvas and high-modulus low-shrinkage cord further improves the structural strength and sealing performance of the spiral packing, making it suitable for sealing requirements of oil media such as petroleum. A rational manufacturing process: By optimizing process parameters for mixing, impregnation, molding, and vulcanization, we ensure good adhesion between the various layers and the overall performance of the spiral packing. The impregnation slurry is stirred for 30 hours to fully dissolve the rubber, ensuring uniformity and stability. The pressurized vulcanization process fully cross-links the rubber, improving the physical and mechanical properties of the spiral packing.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A multifunctional oil pumping rod sealing device for an oil pumping well, comprising an oil pumping rod (8), characterized in that: The oil pumping rod (8) is penetrated from top to bottom by a conveying wheel (9), a pressure cylinder (6), a second sealing cylinder (3), and a first sealing cylinder (2). The interior of the second sealing cylinder (3) is provided with a second sealing cavity (13) and a first pressure cavity (14) at the top and bottom, respectively. The top of the first sealing cylinder (2) is threadedly connected to the inner wall of the first pressure cavity (14), and the top of the second sealing cylinder (3) is threadedly connected to the inner wall of the pressure cylinder (6). The conveying wheel (9) passes through the top side wall of the pressing cylinder (6), and the outer ring side wall of the conveying wheel (9) is fixedly connected with an external boss (11), and the external boss (11) abuts against the inner top side wall of the pressing cylinder (6). The first sealing cavity (15) and the second sealing cavity (13) are both provided with spiral sealing packings (10), and the two sealing packings (10) are both wound on the sealing packings (10).

2. A multifunctional polished rod sealing device for an oil pumping well according to claim 1, characterized in that: A symmetrically arranged first handle (1), a second handle (4), and a third handle (5) are fixedly connected to the outer side walls of the first sealing cylinder (2), the second sealing cylinder (3), and the pressing cylinder (6), respectively.

3. A multifunctional polished rod sealing device for an oil pumping well according to claim 2, characterized in that: An inclined conveying groove (12) is longitudinally provided on the inner side wall of the pressing cylinder (6), and the inclination angle of the conveying groove (12) is 5-30 degrees.

4. A multifunctional polished rod sealing device for an oil pumping well according to claim 3, characterized in that: The bottoms of the second sealed cavity (13) and the first sealed cavity (15) are both in the shape of a truncated cone that tapers downward.

5. The multifunctional polished rod sealing device for an oil pumping well according to claim 4, characterized in that: The preparation method of the sealing packing (10) comprises the following steps: Step 1: Add nitrile rubber, nano-silica, carbon nanotubes, antioxidant 4010NA, antioxidant RD, and dioctyl phthalate to an internal mixer in proportion and mix them. Control the temperature of the internal mixer at 80-100°C and mix for 10-15 minutes. Transfer to an open mixer, add dicumyl peroxide, dibenzothiazole disulfide, and thiuram accelerator, and continue mixing for 5-8 minutes. Remove the sheet and set aside. Step 2: Put the refined film and solvent into a mixing tank and stir at room temperature for 30 hours to make a dipping slurry; put the special canvas into the dipping machine for dipping, and dry it for later use; Step 3: Mix the components of the adhesive according to the formula in an internal mixer, control the mixing temperature at 70-90°C, mix for 8-12 minutes, and prepare the sheet for use; Step 4: Dip the high modulus low shrinkage cord into the dipping slurry, arrange it evenly on the yarn drawing machine, attach the dipping canvas and adhesive film to the cord in order and number of layers, and cut it into the required size; Step 5: Form the cut strip material into a V-belt on a forming machine; Step 6: Form the V-belt blank into a spiral shape on a spiral packing machine, wrap it with canvas, and then put it into a vulcanizing tank for pressurized vulcanization at 160-170℃ and 10-15MPa for 10-20 minutes; Step 7: After vulcanization, cool and demould, and pack after inspection.

6. The multifunctional polished rod sealing device for an oil pumping well according to claim 5, characterized in that: The mass parts of the raw materials in the step 1 are: 100 parts of nitrile rubber, 10-20 parts of nano-silica, 2-5 parts of carbon nanotubes, 2-4 parts of dicumyl peroxide, 0.5-1 part of dibenzothiazole disulfide, 0.2-0.5 parts of thiuram accelerator, 1-2 parts of antioxidant 4010NA, 1-2 parts of antioxidant RD, and 5-10 parts of dioctyl phthalate.

7. A multifunctional polished rod sealing device for an oil pumping well according to claim 6, characterized in that: In the step 2, the mass ratio of the film to the solvent is 1:(3-5).

8. The multifunctional polished rod sealing device for an oil pumping well according to claim 7, characterized in that: The number of layers laminated in step 4 is 3-5 layers, and the impregnated canvas and the adhesive film are laminated alternately.

9. The multifunctional polished rod sealing device for an oil pumping well according to claim 8, characterized in that: The canvas coated in step six is a special canvas that has been dipped in glue, and the dipping method is the same as the dipping method of the special canvas in step two.

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