A wax scraping and cleaning device for sucker rod of oil well

Abstract

The present application relates to oilfield workover ground tool technical field, especially to an oil well sucker rod wax scraping and cleaning device.The oil well sucker rod wax scraping and cleaning device comprises an upper box body and a lower box body, the upper box body and the lower box body are oppositely arranged to form a double-cone hollow cavity, and are connected through a plurality of double-head bolts and hexagonal positioning nuts, a plurality of anti-overflow wax scraping rubber cores are arranged between the upper box body and the lower box body, a discharge joint is arranged at the lower end of the lower box body, a high-pressure joint and a high-pressure sealing gasket are arranged on the outer wall of the lower box body, and a high-pressure jet ring is arranged on the inner wall of the lower box body.The oil well sucker rod wax scraping and cleaning device can improve the cleaning effect by concentrating high-pressure liquid through the double-cone structure, the anti-overflow wax scraping rubber core can scrape off the wax and block the upward movement of the oil wax water, the high-pressure jet ring can generate high-pressure jet to remove stubborn wax and dirt, and the discharge joint can be connected with a ground liquid collection tank to recover the oil wax water generated during the cleaning process, so as to reduce the complexity and labor intensity of manual operation and reduce the environmental pollution during the cleaning process.

Description

Technical Field

[0001] This invention relates to the field of oilfield well workover surface tools, and in particular to a wax scraping and cleaning device for oil well sucker rods. Background Technology

[0002] In oilfield well workover, to remove the wax from the sucker rod retrieved from the well, there are two main methods for wax removal. Existing technologies have at least the following problems: Reverse circulation well washing for wax removal: This method involves connecting a hot washing device to the casing gate valve at the wellhead, injecting hot water into the well. The hot water descends along the annular space of the casing to the bottom of the well, then returns through the tubing channel, and finally flows out from the tubing gate valve at the wellhead's production tree. However, this method has the following problems: Temperature drop: As the hot water descends, its temperature gradually decreases due to the influence of different formation temperatures. This results in the wax on the sucker rod not being thoroughly cleaned, affecting the wax removal effect; Pressure limitation: When the wax blockage in the wellbore is severe, the inlet pressure of the reverse circulation well washing fluid is insufficient to overcome the resistance, making effective wax removal impossible. This not only prolongs the operation time but may also increase the risk of wellbore blockage.

[0003] Steam dewaxing using a surface boiler truck: This method uses a boiler truck on the surface to generate steam, which is then used for dewaxing via a dedicated dewaxing pipeline. However, this method also has several drawbacks. High heat loss: Due to significant heat loss during the steam's transport from the boiler truck to the well, the steam temperature upon arrival at the well is low, resulting in low dewaxing efficiency. This not only increases energy consumption but also reduces the overall dewaxing effect. High cost: Due to heat loss and the need for specialized equipment, this method is costly; the operation and maintenance of the boiler truck also require substantial investment. Environmental pollution risk: The oil and wax produced during the dewaxing process need to be disposed of on the ground. Environmentally friendly cloths are typically used to isolate the surface, and the oil and wax on the cloths are collected and processed. This not only increases additional costs but also poses a risk of leakage and contamination of the well site if the environmentally friendly cloths are damaged. Leakage can pollute the environment and potentially lead to legal and economic liabilities. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a wax scraping and cleaning device for oil well sucker rods to overcome the problems of existing technologies, such as the high risk of pollution at the well site due to pulling the sucker rod out of the well and cleaning it on the surface, low construction efficiency, and high cost of environmentally friendly construction.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides a wax scraping and cleaning device for oil well sucker rods, comprising: an upper box and a lower box; The upper box body consists of two parts: the upper end of the upper box body is a hollow cylindrical structure and the lower end is a conical structure. The lower box consists of two parts: the upper part of the lower box is a conical structure, and the lower part is a hollow cylindrical structure. The upper box and the lower box are arranged opposite to each other, forming a hollow cavity with a double cone structure. The upper box and the lower box are connected by a number of double-headed bolts. The double-headed bolts pass through the upper box and the lower box from top to bottom. Hexagonal positioning nuts are provided at the upper and lower ends of the double-headed bolts respectively. Several anti-overflow wax scraping cores are provided between the upper box and the lower box; The lower box body has a discharge connector on the outer wall of the hollow cylindrical structure at the lower end, and a high-pressure connector on the outer wall of the conical structure at the lower end. A high-pressure sealing gasket is fitted on the high-pressure connector, and a high-pressure jet ring is provided on the inner wall of the upper end of the hollow cylindrical structure at the lower end of the lower box body. The outer wall of the high-pressure jet ring is integrated with the lower box body, and the high-pressure jet ring is connected to the high-pressure connector.

[0006] Preferably, the outer wall of the hollow cylindrical structure at the upper end of the upper box body is provided with an oil pipe connection thread, and the tapered structure at the lower end of the upper box body is provided with an annular structure on the outer edge, and the annular structure is uniformly provided with a plurality of connection holes in the circumferential direction.

[0007] Preferably, the upper tapered structure of the lower box has an outer ring structure, and the ring structure is evenly provided with a plurality of connecting holes in the circumferential direction. The number of connecting holes provided on the upper box and the lower box is the same.

[0008] Preferably, the double-ended bolt is disposed in the connecting hole provided on the upper box and the lower box.

[0009] Preferably, the inner corners of the anti-overflow wax scraper core are rounded, and the outer end is a circular ring structure. Several anti-overflow wax scraper cores can be circumferentially spliced ​​into a hollow cylindrical structure between the upper and lower boxes.

[0010] Preferably, the lower end face of the tapered structure at the lower end of the upper box body is provided with a concave annular groove, and the upper end face of the tapered structure at the upper end of the lower box body is provided with a concave annular groove. The annular grooves provided on the upper and lower box bodies are used to position the annular structure at the outer end of the anti-overflow wax scraper core.

[0011] Preferably, the anti-overflow wax scraper core is made of fluorinated rubber, and the anti-overflow wax scraper core is elastic for removing oil and wax.

[0012] Preferably, the high-pressure jet ring is a hollow ring structure, and a plurality of high-pressure jet holes are uniformly provided on the inner wall of the high-pressure jet ring. The high-pressure jet holes are inclined and the angle of the high-pressure jet holes matches the taper of the lower box's conical structure.

[0013] Preferably, the high-pressure sealing gasket is a metal-rubber vulcanized gasket, which is composed of a nickel-copper alloy ring and a fluorinated rubber ring bonded and vulcanized together.

[0014] (III) Beneficial Effects This invention provides a wax scraping and cleaning device for oil well sucker rods. The device utilizes a double-cone structure formed by an upper and lower housing to effectively concentrate high-pressure liquid, allowing it to act more efficiently on the sucker rod surface during cleaning and improving the cleaning effect. The upper and lower housings are connected by several double-ended bolts and secured with hexagonal locating nuts. This connection method not only provides robust structural support but also facilitates disassembly, assembly, and maintenance. Several anti-overflow wax scraping cores are installed between the upper and lower housings. These cores scrape away wax from the sucker rod while preventing the wax and water from flowing upwards from the rod and tubing out of the well, further enhancing the cleaning effect. A high-pressure connector is used... The high-pressure sealing gasket on the upper part ensures the airtightness of the high-pressure liquid during transmission, preventing leakage and improving cleaning efficiency. The high-pressure jet ring on the inner wall of the lower box connects to the high-pressure connector, generating a high-pressure jet that directly acts on the surface of the sucker rod, effectively removing stubborn wax and dirt. The discharge connector on the outer wall of the hollow cylindrical structure at the lower end of the lower box connects to the surface liquid collection tank at the well workover site, recovering the oil and wax generated during the cleaning process and the oil and wax that rises into the lower box from the tubing. This reduces the complexity and labor intensity of manual operation and minimizes environmental pollution during the cleaning process. Attached Figure Description

[0015] Figure 1 This diagram shows a cross-sectional view of a sucker rod wax scraping and cleaning device for oil wells according to the present invention. Figure 2 This diagram shows the upper housing structure of a sucker rod wax scraping and cleaning device for oil wells according to the present invention. Figure 3 This diagram shows the lower housing structure of a sucker rod wax scraping and cleaning device for oil wells according to the present invention. Figure 4 This diagram illustrates the anti-overflow scraping core structure of a sucker rod wax cleaning device for oil wells according to the present invention.

[0016] The components are: 1: double-ended bolt; 2: hexagonal locating nut; 3: upper box body; 4: lower box body; 5: anti-overflow wax scraping core; 6: high-pressure connector; 7: high-pressure sealing gasket; 8: discharge connector; 9: high-pressure jet ring. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] like Figure 1-4 As shown, the present invention provides a wax scraping and cleaning device for oil well sucker rods, comprising: an upper box body 3 and a lower box body 4; like Figure 2-3 As shown, the upper box 3 consists of two parts: a hollow cylindrical structure at the top and a conical structure at the bottom. The lower box 4 also consists of two parts: a conical structure at the top and a hollow cylindrical structure at the bottom. The upper box 3 and lower box 4 are positioned opposite each other, forming a double-conical hollow cavity. The outer wall of the hollow cylindrical structure at the top of the upper box 3 is provided with a tubing connection thread for connecting a well workover and wax removal gate. The conical structure at the bottom of the upper box 3 has an outer ring-shaped structure with several connecting holes evenly distributed circumferentially. The conical structure at the top of the lower box 4 has an outer ring-shaped structure. The ring-shaped structure has several connecting holes evenly distributed around its circumference. The upper box 3 and the lower box 4 have the same number of connecting holes. The upper box 3 and the lower box 4 are connected by several double-ended bolts 1. The double-ended bolts 1 pass through the upper box 3 and the lower box 4 from top to bottom. The double-ended bolts 1 are located in the connecting holes on the upper box 3 and the lower box 4. Hexagonal positioning nuts 2 are provided at the upper and lower ends of the double-ended bolts 1. The double-ended bolts 1 and the hexagonal positioning nuts 2 tightly press the upper box 3 and the lower box 4 together to ensure that the oil well sucker rod wax scraping and cleaning device will not leak during use.

[0020] The lower end of the tapered structure of the upper box 3 has a concave annular groove on its lower end face, and the upper end of the tapered structure of the lower box 4 also has a concave annular groove. The purpose of these annular grooves is to position the anti-overflow wax scraping core 5. Multiple anti-overflow wax scraping cores 5 are provided between the upper box 3 and the lower box 4. In actual applications, three anti-overflow wax scraping cores 5 are usually used.

[0021] like Figure 4As shown, the inner corners of each anti-overflow wax scraper core 5 are rounded, while its outer end adopts a ring structure. From a top view, a single anti-overflow wax scraper core 5 presents a ring-shaped triangle with a triangular angle of 120°. When three such cores are spliced ​​together, they can form a hollow cylindrical structure. This structural design allows the anti-overflow wax scraper cores 5 to fit tightly, and the ring structure of the anti-overflow wax scraper core 5 is precisely positioned by the annular grooves on the upper box 3 and the lower box 4.

[0022] The anti-overflow scraping core 5 is made of fluorinated rubber. Fluorinated rubber has good resistance to various oils and is not easily corroded by oils. Fluorinated rubber has high tensile strength and hardness, which enables it to effectively remove oil and wax. Fluorinated rubber has excellent weather resistance and ozone resistance and has a long service life. When the sucker rod in the oil well operation passes through the inner hole of the hollow cylindrical structure composed of three anti-overflow scraping cores 5, the anti-overflow scraping core 5 will contact the sucker rod because the diameter of the inner hole of the core is smaller than the diameter of the sucker rod body. This contact can not only scrape off the oil and wax on the sucker rod body, but also prevent the oil and wax water on the rod body and in the tubing from flowing upward, thereby preventing the oil and wax water from overflowing from the wellhead.

[0023] The lower box 4 has a hollow cylindrical structure at its lower end with a discharge connector 8 on its outer wall for discharging and collecting the oil and wax generated during the cleaning process. The lower box 4 also has a conical structure with a high-pressure connector 6 on its outer wall. A high-pressure sealing gasket 7 is fitted onto the high-pressure connector 6. The high-pressure sealing gasket 7 is a metal-rubber vulcanized gasket. The high-pressure sealing gasket 7 is made of nickel-copper alloy and fluorinated rubber through a bonding and vulcanization process. The nickel-copper alloy and fluorinated rubber are tightly bonded together, providing excellent sealing performance and effectively preventing leakage of high-pressure fluids. The high-pressure sealing gasket 7 uses nickel-copper alloy as the skeleton material inside. This material has good corrosion resistance and high-temperature strength and can withstand the impact and corrosion of high-pressure fluids. The outside is wrapped with a layer of fluorinated rubber. This rubber has excellent high-temperature resistance, corrosion resistance, and oil resistance, and can effectively prevent fluid penetration and leakage.

[0024] The lower box 4 has a hollow cylindrical structure at the bottom and a high-pressure jet ring 9 on the upper inner wall. The high-pressure jet ring 9 is a hollow ring structure, and the inner wall of the high-pressure jet ring 9 is evenly circumferentially provided with several high-pressure jet holes. In actual application, the number of high-pressure jet holes is usually 12. The purpose of these jet holes is to control the flow rate and discharge volume of the jet in order to effectively clean the oil and wax on the sucker rod body. The oil and wax water generated during the cleaning process and the oil and wax water in the tubing will be connected to the surface liquid collection tank at the well workover site through the discharge connector 8 for recycling.

[0025] The angle of the high-pressure jet orifice is designed to match the taper of the tapered structure of the lower housing 4 to ensure that the jet can effectively act on the sucker rod body. Furthermore, the outer wall of the high-pressure jet ring 9 is integrally manufactured with the lower housing 4, which not only enhances structural stability but also facilitates maintenance and cleaning. The inner cavity of the high-pressure jet ring 9 is connected to an external high-pressure jet steam device via a high-pressure connector 6.

[0026] The following is a detailed description of the actual working scenario of a sucker rod wax scraping and cleaning device for oil wells.

[0027] In practical applications, this oil well sucker rod wax scraping and cleaning device is used in oil well operations in oil fields. It is mainly used to remove oil and wax deposits on the inner walls of sucker rods and tubing to ensure normal production of oil wells and extend the service life of equipment.

[0028] The upper box 3 and the lower box 4 are firmly connected together by double-headed bolts 1 and hexagonal positioning nuts 2, forming a hollow cavity with a double cone structure. The outer wall of the hollow cylindrical structure at the upper end of the upper box 3 is provided with oil pipe connection threads, which can be connected to the well workover and wax removal gate so as to fix the entire device at the wellhead position of the oil well. When the sucker rod passes through the hollow cavity between the upper box 3 and the lower box 4, the anti-overflow scraper core 5 will come into contact with the sucker rod. Since the anti-overflow scraper core 5 is made of synthetic rubber, it has good elasticity and can fit tightly against the surface of the sucker rod to scrape off the oil and wax on it. The anti-overflow scraper core 5 can also prevent the oil and wax water on the rod and in the tubing from flowing upward, thereby preventing the oil and wax water from overflowing from the wellhead. The lower box 4 has a hollow cylindrical structure at its lower end with a discharge connector 8 on its outer wall for discharging and collecting the oil and wax water generated during the cleaning process. The lower box 4 also has a conical structure with a high-pressure connector 6 on its outer wall, through which high-pressure liquid can be injected into the device. The high-pressure liquid is then sprayed out through the high-pressure jet hole on the high-pressure jet ring 9, forming a high-speed water flow to further clean the sucker rod body. The oil and wax water generated during the cleaning process is connected to a ground liquid collection tank through the discharge connector 8 for recycling.

[0029] It is understood that the various embodiments mentioned above in this invention can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this invention will not elaborate further.

[0030] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0031] This invention provides a sucker rod wax scraping and cleaning device for oil wells. The double-cone structure formed by the upper housing 3 and lower housing 4 effectively concentrates high-pressure liquid, allowing it to act more efficiently on the sucker rod surface during the cleaning process, thus improving the cleaning effect. The upper housing 3 and lower housing 4 are connected by several double-ended bolts 1 and fixed with hexagonal locating nuts 2. This connection method not only provides robust structural support but also facilitates the disassembly, assembly, and maintenance of the device. Several anti-overflow wax scraping cores 5 are installed between the upper housing 3 and lower housing 4. These cores can scrape off the wax on the sucker rod while preventing the oil and wax water on the rod and in the tubing from flowing upwards out of the well, further enhancing the cleaning effect. The high-pressure sealing gasket 7 fitted on the high-pressure connector 6 ensures the sealing of the high-pressure liquid during transmission, preventing leakage and improving cleaning efficiency. The high-pressure jet ring 9 on the inner wall of the lower box 4 is connected to the high-pressure connector 6, generating a high-pressure jet that directly acts on the surface of the sucker rod, effectively removing stubborn wax and dirt. The discharge connector 8 on the outer wall of the hollow cylindrical structure at the lower end of the lower box 4 connects to the surface liquid collection tank at the well workover site, recovering the oil and wax water generated during the cleaning process and the oil and wax water flowing into the lower box from the tubing, thereby reducing the complexity and labor intensity of manual operation.

[0032] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A wax scraping and cleaning device for oil well sucker rods, characterized in that, include: Upper box (3) and lower box (4); The upper box (3) consists of two parts: the upper end of the upper box (3) is a hollow cylindrical structure and the lower end is a conical structure. The lower box (4) consists of two parts: the upper end of the lower box (4) is a conical structure, and the lower end is a hollow cylindrical structure. The upper box (3) and the lower box (4) are arranged opposite to each other, and the upper box (3) and the lower box (4) form a hollow cavity with a double cone structure. The upper box (3) and the lower box (4) are connected by a number of double-headed bolts (1). The double-headed bolts (1) pass through the upper box (3) and the lower box (4) from top to bottom. The upper and lower ends of the double-headed bolts (1) are respectively provided with hexagonal positioning nuts (2). Several anti-overflow wax scraping cores (5) are provided between the upper box body (3) and the lower box body (4). The lower box (4) has a discharge connector (8) on the outer wall of the hollow cylindrical structure at the lower end, and a high-pressure connector (6) on the outer wall of the conical structure of the lower box (4). A high-pressure sealing gasket (7) is fitted on the high-pressure connector (6), and a high-pressure jet ring (9) is provided on the inner wall of the upper end of the hollow cylindrical structure at the lower end of the lower box (4). The outer wall of the high-pressure jet ring (9) is integrated with the lower box body (4), and the high-pressure jet ring (9) is connected to the high-pressure connector (6).

2. The oil well sucker rod wax scraping and cleaning device according to claim 1, characterized in that, The upper box body (3) has an outer wall with a hollow cylindrical structure and an oil pipe connection thread. The lower end of the upper box body (3) has a tapered structure with an outer ring structure. The ring structure has several connection holes evenly distributed around its circumference.

3. The oil well sucker rod wax scraping and cleaning device according to claim 2, characterized in that, The upper tapered structure of the lower box (4) has an outer ring structure, and the ring structure is evenly provided with several connecting holes in the circumferential direction. The number of connecting holes provided on the upper box (3) and the lower box (4) is the same.

4. The oil well sucker rod wax scraping and cleaning device according to claim 3, characterized in that, The double-headed bolt (1) is located in the connecting hole provided on the upper box (3) and the lower box (4).

5. The oil well sucker rod wax scraping and cleaning device according to claim 4, characterized in that, The inner corner of the anti-overflow wax scraper core (5) is rounded, and the outer end is a circular ring structure. Several anti-overflow wax scraper cores (5) can be circumferentially spliced ​​into a hollow cylindrical structure between the upper box body (3) and the lower box body (4).

6. The oil well sucker rod wax scraping and cleaning device according to claim 5, characterized in that, The lower end of the tapered structure of the upper box (3) is provided with a concave annular groove, and the upper end of the tapered structure of the lower box (4) is provided with a concave annular groove. The annular grooves provided on the upper box (3) and the lower box (4) are used to position the annular structure at the outer end of the anti-overflow wax scraper core (5).

7. The oil well sucker rod wax scraping and cleaning device according to claim 1, characterized in that, The anti-overflow wax scraper core (5) is made of fluorinated rubber and has elasticity for removing oil and wax.

8. The oil well sucker rod wax scraping and cleaning device according to claim 1, characterized in that, The high-pressure jet ring (9) is a hollow ring structure. The inner wall of the high-pressure jet ring (9) is uniformly provided with a number of high-pressure jet holes. The high-pressure jet holes are inclined and the angle of the high-pressure jet holes matches the taper of the tapered structure of the lower box (4).

9. The oil well sucker rod wax scraping and cleaning device according to claim 1, characterized in that, The high-pressure sealing gasket (7) is a metal rubber vulcanized gasket, which is composed of a nickel-copper alloy ring and a fluorinated rubber ring bonded and vulcanized.

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