Slotted anode sacrificial anti-corrosion tool under pump

Abstract

According to the technical scheme, the under-pump slotted anode sacrifice anti-corrosion tool is characterized by comprising a core pipe, an oil pipe coupling, a spiral centralizing sleeve, an anode assembly and an elastic contact arm assembly; the tubing coupling is mounted at the front end of the core tube through threads; the spiral centralizing sleeve is rotatably and slidably arranged on the core pipe and is adjacent to the oil pipe coupling; the spiral centralizing sleeve is used for axially positioning the core pipe so that the center line of the core pipe and the center line of the sleeve can be collinear. The anode assembly is fixedly arranged on the core tube and is adjacent to the spiral centralizing sleeve, and the anode assembly is used for carrying out anti-corrosion treatment on the inner wall of the sleeve; the elastic contact arm assembly is fixedly arranged on the core tube and is adjacent to the anode assembly; the elastic contact arm assembly is used for being in contact with the inner wall of the sleeve so as to be matched with the spiral centralizing sleeve to axially position the core tube; wherein the rear end of the core pipe is provided with a kerf, and the kerf is used for filtering mud and sand carried in crude oil, so that the problems in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a sacrificial anti-corrosion tool for anode slotting under a pump. Background Art

[0002] The casing anti-corrosion anode tool is a commonly used casing anti-corrosion product. It is connected to the oil pipe and brought into the oil and water well. The spring contact arm contacts the inner wall of the casing to achieve the purpose of sacrificial anode protection of the casing and realize the goal of casing anti-corrosion. Especially when used in high-temperature oil wells, the effect is even better. The tool does not require daily management after one-time installation. It only needs to be installed during normal pump inspection, which provides a new means for the prevention and control of casing corrosion in oil fields. Traditional anode tools do not have a straightening device and are not suitable for the pipeline under the pump. After eccentric wear occurs, the anode block is in direct contact with the casing, causing uneven corrosion. The anode block falls into the well and requires a lot of resources to salvage it. In addition, there is too much sediment in the crude oil of some oil wells, and the oil directly enters the oil pipe and blocks the oil circuit. Utility Model Content

[0003] The main purpose of the utility model is to provide a sacrificial anti-corrosion tool for anode slotted under a pump to solve the problems existing in the above-mentioned prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a pump-under-slotted anode sacrificial anti-corrosion tool, characterized in that it includes: a core tube, an oil pipe coupling, a spiral straightening sleeve, an anode assembly, and an elastic contact arm assembly; the oil pipe coupling is installed at the front end of the core tube by a thread; the spiral straightening sleeve is rotatably and slidably arranged on the core tube and is adjacent to the oil pipe coupling; the spiral straightening sleeve is used to axially position the core tube so that the center line of the core tube and the center line of the casing are in line; the anode assembly is fixedly arranged on the core tube and is adjacent to the spiral straightening sleeve, and the anode assembly is used to perform anti-corrosion treatment on the inner wall of the casing; the elastic contact arm assembly is fixedly arranged on the core tube and is adjacent to the anode assembly, and the elastic contact arm assembly is used to contact the inner wall of the casing to cooperate with the spiral straightening sleeve to perform axial positioning on the core tube; wherein, the rear end of the core tube has a slit, and the slit is used to filter mud and sand carried in the crude oil.

[0005] Furthermore, the anode assembly includes: an oil pipe insulating sleeve, an anode, an upper insulating sleeve, and an upper fixed joint, wherein the oil pipe insulating sleeve is sleeved on the core pipe; the anode sleeve is sleeved on the oil pipe insulating sleeve; the upper insulating sleeve is sleeved on the oil pipe insulating sleeve and insulates and fixes one end of the anode; the upper fixed joint is sleeved on the core pipe and presses and fixes one end of the upper insulating sleeve and the oil pipe insulating sleeve; wherein the upper fixed joint is adjacent to the spiral straightening sleeve, and the oil pipe coupling and the upper fixed joint are also used to limit the spiral straightening sleeve so that the spiral straightening sleeve can slide between the oil pipe coupling and the upper fixed joint.

[0006] Furthermore, the elastic contact arm assembly includes: a spring fixing sleeve, an elastic contact arm, a lower insulating sleeve, and a lower fixed joint. The spring fixing sleeve is arranged on the core tube; the elastic contact arm is arranged on the spring fixing sleeve and connected to the anode for transferring ions; the lower insulating sleeve is arranged on the rear end of the oil pipe insulating sleeve; the lower fixed joint fixing sleeve is arranged on the core tube and presses and fixes the other end of the lower insulating sleeve and the oil pipe insulating sleeve.

[0007] Furthermore, the elastic contact arm assembly also includes: a first pressure ring and a second pressure ring. The first pressure ring is sleeved on the oil pipe insulating sleeve, and the first pressure ring is used to press and fix the other end of the anode, and is also used to press and fix one end of the spring fixing sleeve; the second pressure ring is sleeved on the oil pipe insulating sleeve, and the second pressure ring is used to press and fix the other end of the spring fixing sleeve.

[0008] Furthermore, there are three elastic contact arms, which are evenly mounted on the spring fixing sleeve to provide elastic support.

[0009] Furthermore, a friction fixing block is provided on the elastic contact arm.

[0010] Furthermore, the spiral straightening sleeve is made of nylon.

[0011] Furthermore, the spiral straightening sleeve is composed of a cylindrical structure and a plurality of spiral ridges, and the plurality of spiral ridges are evenly distributed along the circumference of the side wall of the cylinder.

[0012] The utility model discloses a pump-under-slotted anode sacrificial anti-corrosion tool, which is characterized by comprising: a core tube, a tubing coupling, a spiral straightening sleeve, an anode assembly, and an elastic contact arm assembly; the tubing coupling is installed at the front end of the core tube by means of a thread; the spiral straightening sleeve is rotatably and slidably arranged on the core tube and is adjacent to the tubing coupling; the spiral straightening sleeve is used for axially positioning the core tube so that the center line of the core tube is in line with the center line of the casing; the anode assembly is fixedly arranged on the core tube and is adjacent to the spiral straightening sleeve, and the anode assembly is used for anti-corrosion treatment of the inner wall of the casing; the elastic contact arm assembly is fixedly arranged on the core tube and is adjacent to the anode assembly, and the elastic contact arm assembly is used for contacting the inner wall of the casing to cooperate with the spiral straightening sleeve to axially position the core tube; wherein, the core tube has a slit at the rear end, and the slit is used for filtering mud and sand contained in the crude oil to solve the problems existing in the above-mentioned prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0014] Figure 1 It is a schematic diagram of the overall cross-sectional structure of an optional pump-under-slotted anode sacrificial anti-corrosion tool according to an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall top view structure of an optional pump slotted anode sacrificial anti-corrosion tool according to an embodiment of the utility model;

[0016] Figure 3 It is a partial structural schematic diagram of an optional under-pump slotted anode sacrificial anti-corrosion tool according to an embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of the structure of a spiral straightening sleeve of a pump slotted anode sacrificial anti-corrosion tool that can be selected according to an embodiment of the utility model;

[0018] The above drawings include the following reference numerals:

[0019] 10. core tube; 20. oil pipe coupling; 30. spiral straightening sleeve; 40. anode assembly; 41. oil pipe insulating sleeve; 42. anode; 43. upper insulating sleeve; 44. upper fixed joint; 50. elastic contact arm assembly; 51. spring fixing sleeve; 52. elastic contact arm; 53. lower insulating sleeve; 54. lower fixed joint; 55. first pressure ring; 56. second pressure ring. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] According to an embodiment of the present invention, a pump slotted anode sacrificial anti-corrosion tool is provided. Figure 1 to Figure 2As shown, it includes: a core tube 10, a tubing coupling 20, a spiral straightening sleeve 30, an anode assembly 40, and an elastic contact arm assembly 50; the tubing coupling 20 is installed at the front end of the core tube 10 by threads; the spiral straightening sleeve 30 is rotatably and slidably arranged on the core tube 10 and is adjacent to the tubing coupling 20; the spiral straightening sleeve 30 is used to axially position the core tube 10 so that the center line of the core tube 10 is in line with the center line of the casing; the anode assembly 40 is fixedly arranged on the core tube 10 and is adjacent to the spiral straightening sleeve 30, and the anode assembly 40 is used to perform anti-corrosion treatment on the inner wall of the casing; the elastic contact arm assembly 50 is fixedly arranged on the core tube 10 and is adjacent to the anode assembly 40, and the elastic contact arm assembly 50 is used to contact the casing The inner wall contacts to cooperate with the spiral straightening sleeve 30 to axially position the core tube 10; wherein, the core tube 10 has a slit at the rear end, and the slit is used to filter the mud and sand contained in the crude oil. The anode assembly 40 protects the inner wall of the casing by providing a sacrificial anode to effectively prevent corrosion. This design extends the service life of the casing and reduces maintenance costs. The spiral straightening sleeve 30 and the elastic contact arm assembly 50 work together to ensure that the core tube 10 maintains the center line in the casing to avoid deviation. This design not only increases the stability of the equipment, but also improves the uniformity of the anti-corrosion effect. The slit design at the rear end of the core tube 10 can effectively filter the mud and sand in the crude oil, prevent impurities from entering the pump system, and reduce the risk of wear and blockage.

[0022] Furthermore, if Figure 3 As shown, the anode assembly 40 includes: an oil pipe insulating sleeve 41, an anode 42, an upper insulating sleeve 43, and an upper fixed joint 44. The oil pipe insulating sleeve 41 is sleeved on the core pipe 10; the anode 42 is sleeved on the oil pipe insulating sleeve 41; the upper insulating sleeve 43 is sleeved on the oil pipe insulating sleeve 41 and one end of the anode 42 is insulated and fixed; the upper fixed joint 44 is fixedly sleeved on the core pipe 10 and the upper insulating sleeve 43 and one end of the oil pipe insulating sleeve 41 are pressed and fixed; wherein the upper fixed joint 44 is adjacent to the spiral straightening sleeve 30, the oil pipe coupling 20 and the upper fixed joint 44 are also used to limit the spiral straightening sleeve 30 so that the spiral straightening sleeve 30 slides between the oil pipe coupling 20 and the upper fixed joint 44, the use of the oil pipe insulating sleeve 41 and the upper insulating sleeve 43 ensures the electrical isolation between the anode 42 and other metal parts, prevents unnecessary current leakage, improves the efficiency and safety of the anti-corrosion system, and the upper fixed joint presses and fixes the insulating sleeve, so that the overall structure of the tool is stable and reliable.

[0023] Furthermore, if Figure 1As shown, the elastic contact arm assembly 50 includes: a spring fixing sleeve 51, an elastic contact arm 52, a lower insulating sleeve 53, and a lower fixed joint 54. The spring fixing sleeve 51 is arranged on the core tube 10; the elastic contact arm 52 is arranged on the spring fixing sleeve 51 and connected to the anode 42 for transferring ions; the lower insulating sleeve 53 is sleeved on the rear end of the oil pipe insulating sleeve 41; the lower fixed joint 54 is fixedly sleeved on the core tube 10 and presses and fixes the other end of the lower insulating sleeve 53 and the oil pipe insulating sleeve 41. The arrangement of the elastic contact arm 52 enables the tool to maintain contact with the inner wall of the casing. Continuous contact provides additional stability. Even if vibration or other disturbances occur during downhole operations, the elastic contact arm can absorb part of the energy to prevent the tool from being displaced or offset, thereby ensuring the axial positioning of the core tube 10. The elastic contact arm 52 is connected to the anode 42. The contact through the elastic structure can effectively transfer ions to ensure efficient flow and conduction of ions in the system. The lower insulating sleeve 53 and the oil pipe insulating sleeve 41 are firmly combined through the compression and fixation of the lower fixed joint 54, which makes the installation and removal of the tool easier.

[0024] Furthermore, if Figure 1 As shown, the elastic contact arm assembly 50 also includes: a first pressure ring 55 and a second pressure ring 56. The first pressure ring 55 is sleeved on the oil pipe insulating sleeve 41, and the first pressure ring 55 is used to press and fix the other end of the anode 42, and is also used to press and fix one end of the spring fixing sleeve 51; the second pressure ring 56 is sleeved on the oil pipe insulating sleeve 41, and the second pressure ring 56 is used to press and fix the other end of the spring fixing sleeve 51. The anode 42 is fixed by the first pressure ring 55 and the second pressure ring 56, so that the overall structure of the tool is stable and reliable.

[0025] Furthermore, if Figure 1 As shown, there are three elastic contact arms 52, which are evenly installed on the spring fixing sleeve 51 to provide elastic support. The number and uniform distribution of the elastic contact arms 52 enable the tool to adapt to the inner diameters of sleeves of different sizes and provide a wide range of adaptability. The contact between these contact arms and the inner wall of the sleeve further ensures the uniformity and consistency of the anti-corrosion protection.

[0026] Furthermore, if Figure 1 As shown, a friction fixing block is provided on the elastic contact arm 52. The use of the friction fixing block increases the supporting force and makes the device more solid.

[0027] Furthermore, if Figure 4 As shown, the spiral straightening sleeve 30 is made of nylon, which has excellent chemical resistance and anti-aging properties, ensuring long-term reliable operation of the tool in harsh underground environments. In addition, these materials also have good insulation properties, ensuring the electrochemical properties of the anode assembly and improving the stability of the entire anti-corrosion system.

[0028] Furthermore, if Figure 4As shown, the spiral straightening sleeve 30 is composed of a cylindrical structure and a plurality of spiral ridges. The plurality of spiral ridges are evenly distributed along the circumference of the side wall of the cylinder. The spiral ridges are evenly distributed on the outer surface of the cylinder, which helps to reduce the friction and contact area between the straightening sleeve and the inner wall of the casing. This design can reduce the wear on the inner wall of the casing, while reducing the wear on the straightening sleeve itself, thereby extending the service life of the casing and the tool.

[0029] When the well repair equipment moves the core tube 10 downward, the spiral straightening sleeve 30 on the core tube 10 cooperates with the inner wall of the casing to align the center line of the anode 42 with the center line of the casing to prevent eccentric wear and uneven corrosion. In order to avoid hard friction between the spiral straightening sleeve 30 and the inner wall of the casing and meet the durability requirement of the spiral straightening sleeve 30, the spiral straightening sleeve 30 can rotate and slide during the movement of the casing to reduce the wear of the spiral straightening sleeve 30. The associated gas and crude oil in the casing can also pass through the thread gap. The core tube 10 is laser cut, and the crude oil enters the oil pipe through the gap of the cut core tube. At the same time, the mud and sand in the oil are filtered to improve the pipeline blockage phenomenon. The sacrificial electrochemical reaction of the anode protects the casing and filters and collects the crude oil at the same time.

[0030] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sacrificial anti-corrosion tool for anode slotting under a pump, characterized in that: include: Core tube (10); An oil pipe coupling (20), the oil pipe coupling (20) being installed on the front end of the core pipe (10) through threads; a spiral straightening sleeve (30), the spiral straightening sleeve (30) being rotatably and slidably disposed on the core pipe (10) and adjacent to the oil pipe coupling (20); the spiral straightening sleeve (30) being used to axially position the core pipe (10) so that the center line of the core pipe (10) is collinear with the center line of the casing; an anode assembly (40), the anode assembly (40) being fixedly disposed on the core tube (10) and adjacent to the spiral straightening sleeve (30), the anode assembly (40) being used for performing anti-corrosion treatment on the inner wall of the sleeve; an elastic contact arm assembly (50) fixedly arranged on the core tube (10) and adjacent to the anode assembly (40), the elastic contact arm assembly (50) being used to contact the inner wall of the sleeve to cooperate with the spiral straightening sleeve (30) to axially position the core tube (10); The rear end of the core tube (10) is provided with a slit, and the slit is used to filter mud and sand contained in the crude oil.

2. A pump-under-slot anode sacrificial anti-corrosion tool according to claim 1, characterized in that: The anode assembly (40) comprises: An oil pipe insulation sleeve (41), wherein the oil pipe insulation sleeve (41) is sleeved on the core pipe (10); an anode (42), wherein the anode (42) is sleeved on the oil pipe insulating sleeve (41); An upper insulating sleeve (43), the upper insulating sleeve (43) is sleeved on the oil pipe insulating sleeve (41) and insulates and fixes one end of the anode (42); An upper fixed joint (44), wherein the upper fixed joint (44) is fixedly sleeved on the core tube (10) and presses and fixes the upper insulating sleeve (43) and one end of the oil pipe insulating sleeve (41); The upper fixed joint (44) is adjacent to the spiral straightening sleeve (30), and the tubing coupling (20) and the upper fixed joint (44) are also used to limit the spiral straightening sleeve (30) so that the spiral straightening sleeve (30) slides between the tubing coupling (20) and the upper fixed joint (44).

3. A pump-under-slot anode sacrificial anti-corrosion tool according to claim 2, characterized in that: The elastic contact arm assembly (50) comprises: A spring fixing sleeve (51), wherein the spring fixing sleeve (51) is arranged on the core tube (10); an elastic contact arm (52), the elastic contact arm (52) being arranged on the spring fixing sleeve (51) and connected to the anode (42) for transferring ions; A lower insulating sleeve (53), wherein the lower insulating sleeve (53) is sleeved on the rear end of the oil pipe insulating sleeve (41); A lower fixed joint (54) is fixedly sleeved on the core tube (10) and presses and fixes the other end of the lower insulating sleeve (53) and the oil pipe insulating sleeve (41).

4. A pump-under-slot anode sacrificial anti-corrosion tool according to claim 3, characterized in that: The elastic contact arm assembly (50) further comprises: A first pressing ring (55), the first pressing ring (55) is sleeved on the oil pipe insulating sleeve (41), the first pressing ring (55) is used to press and fix the other end of the anode (42), and is also used to press and fix one end of the spring fixing sleeve (51); A second pressing ring (56), the second pressing ring (56) is sleeved on the oil pipe insulating sleeve (41), and the second pressing ring (56) is used to press and fix the other end of the spring fixing sleeve (51).

5. The sacrificial anti-corrosion tool for anode slotting under a pump according to claim 3, characterized in that: There are three elastic contact arms (52), which are evenly mounted on the spring fixing sleeve (51) to provide elastic support.

6. A pump-under-slot anode sacrificial anti-corrosion tool according to claim 3, characterized in that: The elastic contact arm (52) is provided with a friction fixing block.

7. The sacrificial anti-corrosion tool for anode slotting under a pump according to claim 1, characterized in that: The spiral straightening sleeve (30) is made of nylon.

8. The sacrificial anti-corrosion tool for anode slotting under a pump according to claim 1, characterized in that: The spiral straightening sleeve (30) consists of a cylindrical structure and a plurality of spiral ridges, wherein the plurality of spiral ridges are evenly distributed along the circumference of the side wall of the cylinder.

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