Anti-corrosion sand blasting device and process in oil casing

Abstract

The invention discloses an anti-corrosion sand blasting device and process in an oil casing, and particularly relates to the technical field of sand blasting devices.The anti-corrosion sand blasting device in the oil casing comprises a bracket, a translation assembly, a sand blasting pipe, a flange base and a rotating part, the bracket, the translation assembly, the sand blasting pipe, the flange base and the rotating part are coaxially and rotationally connected to a mounting cavity, and a through opening communicating with a sand blasting opening is formed in the end face of the rotating part; and the shaftless spiral auger is coaxially mounted in the mounting cavity and freely rotates in the mounting cavity, and the axial end of the shaftless spiral auger is fixedly connected to the end face of the rotating part. According to the sand blasting device, when conveyed to the sand blasting seat through compressed air flow, grinding materials are blocked by the shaftless spiral packing auger, so that the grinding materials are accumulated in the sand blasting seat, then the grinding materials in the sand blasting seat are continuously conveyed to the sand blasting opening through rotation of the shaftless spiral packing auger, and then the grinding materials are sprayed to the inner wall of an oil sleeve through the compressed air flow; the abrasive is continuously and uniformly conveyed, and the situation that the abrasive is temporarily lost to affect the sand blasting effect is prevented.

Description

Technical Field

[0001] This invention belongs to the technical field of sandblasting equipment, specifically relating to a sandblasting device and process for anti-corrosion sandblasting inside oil casing. Background Technology

[0002] Oil casing is a steel pipe installed in the borehole of an oil well. It is used to fix the wellbore, isolate different formations, support wellbore equipment, and protect the normal flow of drilling fluid and oil and gas. It is an indispensable key piece of equipment in the oil drilling and extraction process. Sandblasting is a process that uses a high-speed stream of abrasive particles to impact the surface of an object. Its purpose is to clean, roughen, or change the physical properties of the surface. Sandblasting typically uses compressed air to propel abrasive particles at high speed onto the workpiece surface, utilizing the sharp edges and impact force of the abrasive to remove surface impurities, while simultaneously achieving both cleanliness and roughness.

[0003] When performing anti-corrosion work on oil casing, it is often necessary to sandblast its inner surface. Existing sandblasting equipment mainly uses compressed air to spray abrasive at high speed onto the inner wall of the oil casing for sandblasting anti-corrosion. However, since it relies on the flow of compressed air to spray the abrasive, this method cannot guarantee that the abrasive can be sprayed evenly onto the inner wall of the oil casing. In particular, it may cause poor abrasive flow, resulting in a temporary loss of abrasive sprayed onto the inner wall of the oil casing, resulting in uneven sandblasting on various parts of the inner wall of the oil casing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an anti-corrosion sandblasting device and process for oil casing.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: an anti-corrosion sandblasting device for oil casing, comprising:

[0006] The bracket has an arc-shaped clamp at the top;

[0007] Translation component, mounted on the bracket;

[0008] A sandblasting pipe is driven to be connected to the translation assembly and is coaxial with the arc-shaped clamp. The translation assembly is used to drive the sandblasting pipe to move linearly.

[0009] A flange seat is connected through to the sandblasting pipe. The flange seat is connected to a sandblasting seat. The sandblasting seat has an installation cavity inside. A sandblasting port is provided at the end of the sandblasting seat away from the sandblasting pipe.

[0010] The rotating part is coaxially rotatably connected to the mounting cavity, and the end face of the rotating part has a through port communicating with the sandblasting nozzle;

[0011] A shaftless spiral auger is coaxially mounted in the mounting cavity and rotates freely within the mounting cavity. One axial end of the shaftless spiral auger is fixed to the end face of the rotating part.

[0012] With the above technical solution, when the abrasive is transported to the sandblasting base by compressed air, it is blocked by the shaftless spiral auger, causing the abrasive to accumulate in the sandblasting base. Then, by rotating the shaftless spiral auger, the abrasive in the sandblasting base is continuously transported to the sandblasting nozzle. Then, the abrasive is sprayed onto the inner wall of the oil casing by compressed air, so as to achieve continuous and uniform delivery of abrasive and prevent the sandblasting effect from being affected by the temporary loss of abrasive.

[0013] Furthermore, the end of the sandblasting pipe furthest from the sandblasting base is connected to a sand storage tank via an air pipe, and the air pipe is also connected to a compressed air pipe.

[0014] Through the above technical solution, compressed air enters the air pipe through the compressed air pipe, thereby forming a compressed air flow in the air pipe. Driven by the air flow, the abrasive in the sand storage tank will enter the sandblasting seat along with the air flow.

[0015] Furthermore, the translation component includes a cylinder horizontally mounted on the bracket, the cylinder being driven and connected to a connecting plate, and the sandblasting pipe being fixedly inserted through the connecting plate.

[0016] Through the above technical solution, the cylinder rod of the cylinder extends and retracts to drive the connecting plate to move, thereby enabling the sandblasting seat to move horizontally and linearly.

[0017] Furthermore, a ring gear is coaxially fixed to the end face of the rotating part, a motor base is fixed to the sandblasting seat, a motor is installed inside the motor base, the motor drives a transmission gear, the transmission gear meshes with the ring gear, and a clearance groove is provided on the surface of the sandblasting seat to allow the transmission gear to pass freely.

[0018] Through the above technical solution, the motor drives the transmission gear to rotate, so that the transmission gear meshes with the ring gear, thereby driving the rotating part to rotate, so that the rotating part drives the shaftless spiral auger to rotate within the mounting cavity.

[0019] Furthermore, a flow guide is fixedly connected to the end of the sandblasting seat away from the sandblasting pipe via multiple connecting posts, and a flow guide cone is fixedly connected to the side of the flow guide facing the sandblasting seat.

[0020] Through the above technical solution, the abrasive ejected from the blasting nozzle will come into contact with the guide cone, and through the dispersion of the guide cone, the abrasive will be sprayed obliquely and evenly radially toward the inner wall of the inner sleeve.

[0021] Furthermore, a sliding part is fixedly connected to one end of the shaftless spiral auger away from the rotating part. The sliding part is slidably engaged in the mounting cavity. The sliding part is provided with a compression component, which is used to intermittently generate an axial force on the shaftless spiral auger when it rotates.

[0022] Through the above technical solution, when the shaftless spiral auger rotates, the compression component generates an axial force on the shaftless spiral auger, so that the shaftless spiral auger is compressed. When the shaftless spiral auger is compressed and deformed, its pitch decreases, which in turn generates a larger shear force on the abrasive in the mounting cavity. In this way, when the abrasive agglomerates, the increased shear force can separate the agglomerated abrasive, thereby avoiding excessive impact of the agglomerated abrasive on the inner wall of the oil casing, which would affect the sandblasting effect of the inner wall of the oil casing.

[0023] Furthermore, the compression assembly includes a fixing ring coaxially fixed to the end face of the flange seat, an mounting arm fixed to the end face of the fixing ring, a roller rotatably connected to the mounting arm, and an arc-shaped protrusion fixed to the end face of the sliding part, the roller cooperating with the arc-shaped protrusion.

[0024] With the above technical solution, when the shaftless spiral auger rotates, the rollers will roll on the end face of the sliding part and the surface of the arc-shaped protrusion. Combined with the elastic deformation recovery capability of the shaftless spiral auger itself, the shaftless spiral auger can continuously reciprocate and extend during rotation to intermittently generate shearing force on the abrasive without the need for additional power components.

[0025] Furthermore, a sealing ring is coaxially fixed to the end face of the fixed ring, the sealing ring is slidably inserted through the central hole of the sliding part, a powder outlet cavity is opened inside the sealing ring, the powder outlet cavity communicates with the mounting cavity, and a powder conveying pipe is inserted through the sandblasting seat, one end of the powder conveying pipe is inserted into the sealing ring and communicates with the powder outlet cavity.

[0026] Through the above technical solution, the powder conveying pipe transports the dry powder used to lubricate the abrasive to the powder outlet chamber, and mixes it into the abrasive along with the compressed air flow, thereby lubricating the abrasive. This allows the dry powder to mix into the abrasive when it is conveyed by the shaftless spiral auger, so that the abrasive can smoothly enter the sandblasting nozzle. In addition, during the compression process of the shaftless spiral auger, the abrasive is subjected to relatively large extrusion pressure. At this time, the dry powder lubrication of the abrasive allows the agglomerated abrasive to be quickly separated.

[0027] Furthermore, the sealing ring has a conical portion integrally formed and fixed at the end away from the fixed ring. The outer diameter of the conical portion increases sequentially in the direction away from the fixed ring. A deformation groove penetrating the powder outlet cavity is opened on the periphery of the conical portion. The sliding portion has a conical groove for the conical portion to engage.

[0028] With the above technical solution, when the sliding part moves towards the rotating part so that the shaftless auger is in a compressed state, the sliding part and the sealing ring move relative to each other, which causes the cone to slide relative to each other in the cone groove. Under the pressure of the inner wall of the cone groove, the cone undergoes elastic contraction deformation along its radial inner side, which causes the opening of the powder outlet cavity to shrink until it closes. This avoids a large amount of compressed air from the powder outlet cavity entering the powder conveying pipe when the shaftless auger is compressed, which would prevent the dry powder from being smoothly conveyed to the powder outlet cavity.

[0029] A sandblasting process for internal corrosion protection of oil casing, applied to the sandblasting device described above, includes:

[0030] The two ends of the oil casing are respectively engaged in the arc-shaped clamps at both ends of the bracket, and the sandblasting pipe is moved by the translation component, so that the sandblasting seat moves into the oil casing.

[0031] Compressed air flows inside the blasting pipe and delivers the abrasive to the mounting cavity of the blasting base. The abrasive is blocked by the shaftless spiral auger, causing it to accumulate in the mounting cavity. The rotating part then rotates, which in turn drives the shaftless spiral auger to rotate. As the shaftless spiral auger rotates, it delivers the abrasive from one side of the mounting cavity to the other side and continuously ejects it from the blasting nozzle.

[0032] The above technical solution utilizes the rotation of a shaftless spiral auger to continuously transport the abrasive material from the blasting seat to the blasting nozzle. Then, compressed air is used to spray the abrasive material onto the inner wall of the oil casing, achieving continuous and uniform delivery of the abrasive material and preventing temporary loss of abrasive material from affecting the blasting effect.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. In this invention, when the abrasive is transported to the sandblasting base by compressed air flow, it is blocked by the shaftless spiral auger, causing the abrasive to accumulate in the sandblasting base. Then, by rotating the shaftless spiral auger, the abrasive in the sandblasting base is continuously transported to the sandblasting nozzle. Then, the abrasive is sprayed onto the inner wall of the oil casing by compressed air flow, so as to achieve continuous and uniform delivery of abrasive and prevent the sandblasting effect from being affected by the temporary loss of abrasive.

[0035] 2. In this invention, the powder conveying pipe transports the dry powder used to lubricate the abrasive to the powder outlet chamber, and mixes it into the abrasive along with the compressed air flow, thereby lubricating the abrasive. This allows the dry powder to mix into the abrasive when it is conveyed by the shaftless spiral auger, so that the abrasive can smoothly enter the sandblasting nozzle. In addition, during the compression process of the shaftless spiral auger, the abrasive is subjected to relatively large extrusion pressure. At this time, the dry powder is used to lubricate the abrasive, so that the abrasive can be quickly separated.

[0036] 3. In this invention, when the sliding part moves toward the rotating part so that the shaftless spiral auger is in a compressed state, the sliding part and the sealing ring move relative to each other, which causes the cone to slide relative to each other in the cone groove. Under the pressure of the inner wall of the cone groove, the cone undergoes elastic contraction deformation along its radial inner side, which causes the opening of the powder outlet cavity to shrink until it closes. This avoids a large amount of compressed air from the powder outlet cavity entering the powder conveying pipe when the shaftless spiral auger is compressed, which would prevent the dry powder from being smoothly conveyed to the powder outlet cavity. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an anti-corrosion sandblasting device for oil casing in this invention;

[0038] Figure 2 This is a schematic diagram showing the positional relationship between the sandblasting base and the flow guide after assembly in this invention;

[0039] Figure 3 yes Figure 2 A schematic diagram showing the positional relationship of the middle section after it has been cut open.

[0040] Figure 4 yes Figure 2 Schematic diagram of the explosive decomposition of the medium structure;

[0041] Figure 5 This is a schematic diagram of the sandblasting base in this invention;

[0042] Figure 6 yes Figure 5 A schematic diagram showing the positional relationship of the structure after it has been cut open.

[0043] Figure 7 This is a schematic diagram showing the positional relationship of the shaftless spiral auger, rotating part, and sliding part after assembly in this invention;

[0044] Figure 8 yes Figure 7 A diagram illustrating the positional relationship from another perspective;

[0045] Figure 9 This is a schematic diagram showing the positional relationship between the fixed ring and the sealing ring after assembly in this invention;

[0046] Figure 10 yes Figure 9 A schematic diagram showing the positional relationship of the structure after it has been cut open.

[0047] Reference numerals: 1. Compressed air pipe; 2. Sand storage tank; 3. Air pipe; 4. Connecting plate; 5. Sandblasting pipe; 6. Sandblasting base; 7. Cylinder; 8. Arc-shaped clamp; 9. Bracket; 10. Flange seat; 11. Powder conveying pipe; 12. Motor base; 13. Transmission gear; 14. Void relief groove; 15. Sandblasting nozzle; 16. Guide cone; 17. Guide part; 18. Motor; 19. Fixing ring; 20. Mounting arm; 21. Sealing ring; 22. Sliding part; 23. Deformation groove; 24. Mounting cavity; 25. Shaftless spiral auger; 26. Rotating part; 27. Ring gear; 28. Through port; 29. ​​Conical groove; 30. Arc-shaped protrusion; 31. Roller; 32. Conical part; 33. Through port; 34. Powder outlet cavity. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] like Figures 1-10 As shown, this embodiment provides: an anti-corrosion sandblasting device for an oil casing, including a bracket 9. Each of the two ends of the bracket 9 has an arc-shaped clamp 8 at its top. The inner diameter of the arc-shaped clamp 8 matches the outer diameter of the oil casing, allowing both ends of the oil casing to be placed within the two arc-shaped clamps 8 respectively. Additionally, C-clamps or other clamps can be installed at both ends of the bracket 9 to clamp the oil casing. A sand storage tank 2 containing dried abrasive is placed on the outside of the bracket 9. A tee pipe is installed at the outlet of the sand storage tank 2, and a compressed air pipe 1 is installed at one end of the tee pipe. The compressed air pipe 1 connects to the external... The compressed air delivery system is connected, and another port of the three-way pipe is equipped with an air pipe 3. The end of the air pipe 3 away from the sand storage tank 2 is connected to a sandblasting pipe 5. The sandblasting pipe 5 is coaxial with the arc-shaped clamp 8. In addition, a cylinder 7 is installed on the bracket 9. The cylinder rod of the cylinder 7 slides through the bracket 9 and is fixedly connected to a connecting plate 4. One end of the sandblasting pipe 5 is fixedly inserted into the upper end of the connecting plate 4, so that the sandblasting pipe 5 is coaxial with the arc-shaped clamp 8. The other end of the sandblasting pipe 5 is equipped with a flange seat 10. The inner cavity of the flange seat 10 is connected to the inner cavity of the sandblasting pipe 5. In addition, a sandblasting seat 6 is installed at the end of the flange seat 10 away from the sandblasting pipe 5.

[0050] A mounting cavity 24 is coaxially formed inside the sandblasting base 6. A rotating part 26 is rotatably connected to the side of the mounting cavity 24 away from the flange seat 10 via a bearing. The rotating part 26 is coaxial with the sandblasting base 6. A ring gear 27 is coaxially fixed to the end face of the rotating part 26. A motor base 12 is fixed to the wall of the sandblasting base 6. A motor 18 is installed inside the motor base 12. The motor shaft of the motor 18 passes through the motor base 12 and is coaxially sleeved with a transmission gear 13. The transmission gear 13 meshes with the ring gear 27. The sandblasting base 6 has... The clearance groove 14, through which the transmission gear 13 can pass freely, is started by the motor 18, causing the motor shaft of the motor 18 to rotate and drive the transmission gear 13 to rotate. When the transmission gear 13 rotates, it will drive the ring gear 27 to mesh and transmit power. When the ring gear 27 rotates, it will synchronously drive the rotating part 26 to rotate. The end face of the rotating part 26 is fixedly connected to the shaftless spiral auger 25. The shaftless spiral auger 25 is coaxially engaged and installed in the mounting cavity 24, and can rotate and slide freely in the mounting cavity 24.

[0051] A sliding part 22 is fixedly connected to the end of the shaftless spiral auger 25 away from the rotating part 26 (the end closest to the flange seat 10). The sliding part 22 is coaxially engaged in the mounting cavity 24 and can rotate and slide freely within the mounting cavity 24. A sandblasting nozzle 15 communicating with the mounting cavity 24 is opened at the end of the sandblasting seat 6 away from the flange seat 10. A guide part 17 is fixedly connected to the end of the sandblasting seat 6 away from the sandblasting pipe 5 via multiple connecting posts. A guide cone 16 is fixedly connected to the side of the guide part 17 facing the sandblasting seat 6. A fixing ring 19 is coaxially fixed to the end face of the 10. A mounting arm 20 is fixed to the end face of the fixing ring 19. A roller 31 is rotatably connected to the mounting arm 20. An arc-shaped protrusion 30 is fixed to the end face of the sliding part 22. The roller 31 and the arc-shaped protrusion 30 are used in conjunction. When the rotating part 26 rotates, the shaftless spiral auger 25 will synchronously drive the sliding part 22 to rotate. When the sliding part 22 rotates, the roller 31 will roll alternately on the end face of the sliding part 22 and the surface of the arc-shaped protrusion 30.

[0052] A sealing ring 21 is coaxially fixed to the end face of the fixed ring 19. The sealing ring 21 is slidably inserted through the hole in the sliding part 22. A powder outlet chamber 34 is opened inside the sealing ring 21. The powder outlet chamber 34 is connected to the mounting chamber 24. The hole in the sealing ring 21 forms a penetration entrance 33. The penetration entrance 33 is connected to the mounting chamber 24 and the inner cavity of the flange seat 10. A powder conveying pipe 11 is inserted through the sandblasting seat 6. One end of the powder conveying pipe 11 is inserted into the sealing ring 21 and is connected to the powder outlet chamber 34. The powder conveying pipe 11 is connected to an external dry powder conveying system through a pipeline. The external dry powder conveying system can convey dry powder (such as talc powder) used to lubricate the abrasive to the powder conveying pipe 11 and then to the powder outlet chamber 34. Since the powder outlet chamber 34 is connected to the mounting chamber 24, the dry powder can enter the mounting chamber 24 from the powder outlet chamber 34.

[0053] A cone 32 is integrally formed and fixed to the end of the sealing ring 21 away from the fixed ring 19. The outer diameter of the cone 32 increases sequentially in the direction away from the fixed ring 19. A deformation groove 23 penetrating the powder outlet cavity 34 is opened around the periphery of the cone 32. A conical groove 29 is opened on the sliding part 22 for the cone 32 to engage. The cone 32 and the conical groove 29 form a tapered fit. When the sliding part 22 moves in the direction away from the flange seat 10, it will move in the direction away from the fixed ring 19. During the movement, the cone 32 will be squeezed by the inner wall of the conical groove 29, which will cause the cone 32 to undergo elastic contraction deformation, thereby reducing the opening of the powder outlet cavity 34. Furthermore, the inner diameter of the powder outlet cavity 34 can be set to decrease sequentially in the direction away from the flange seat 10. This makes the opening of the powder outlet cavity 34 shrink to a greater extent or even close when the cone 32 is squeezed, which can prevent compressed air from entering the powder outlet cavity 34.

[0054] The working principle of this embodiment is as follows:

[0055] Place both ends of the oil casing in the arc-shaped clamps 8 at both ends of the bracket 9 along its length, and then use external C-clamps to clamp both ends of the oil casing, so that the oil casing can be firmly clamped and installed on the bracket 9. Start the external compressed air system, and the compressed air system delivers compressed air to the tee pipe, and creates an airflow in the air pipe 3. Driven by the airflow, the abrasive in the sand storage tank 2 will enter the sandblasting pipe 5 with the compressed air flow, and then enter the installation cavity 24 through the flange seat 10 and the inlet 33 in sequence. The motor 18 starts synchronously, and the motor shaft of the motor 18 rotates. When rotating, it will drive the transmission gear 13 to rotate. Then, through the meshing of the transmission gear 13 and the ring gear 27, the ring gear 27 will synchronously drive the rotating part 26 to rotate.

[0056] After the abrasive enters the mounting cavity 24, it is blocked by the shaftless spiral auger 25, which slows down the flow speed of the abrasive and causes it to accumulate in the mounting cavity 24 of the sandblasting seat 6. The rotation of the shaftless spiral auger 25 enables the abrasive accumulated in the mounting cavity 24 to be uniformly and continuously transported to the through port 28 of the rotating part 26. Then, it is sprayed from the sandblasting nozzle 15 to the guide cone 16. Since the compressed air flow also passes through the mounting cavity 24 and the sandblasting nozzle 15, the abrasive will impact the guide cone 16 at high speed under the action of the compressed air flow. The guiding and dispersing effect of the guide cone 16 makes the abrasive uniformly and radially sprayed onto the inner wall of the oil casing, thereby uniformly sandblasting the inner wall of the oil casing.

[0057] When the shaftless spiral auger 25 rotates, it also drives the sliding part 22 to rotate synchronously. When the sliding part 22 rotates, the relative position of the arc-shaped protrusion 30 and the roller 31 will change. Specifically, when the roller 31 rolls from the end face of the sliding part 22 to the surface of the arc-shaped protrusion 30, the arc-shaped protrusion 30 will be squeezed by the roller 31, which will cause the sliding part 22 to move in the direction of the rotating part 26 and compress the shaftless spiral auger 25. As a result, when the shaftless spiral auger 25 is compressed, the pressure on the abrasive in the mounting cavity 24 will increase. This will increase the relative shear force between the abrasives when they are transported in the mounting cavity 24, so that the abrasives can be separated and the abrasives will not affect the sandblasting effect on the inner wall of the oil casing.

[0058] Because the shaftless auger 25 can accumulate elastic potential energy when compressed, when the roller 31 rolls from the surface of the arc-shaped protrusion 30 to the end face of the sliding part 22, the elastic potential energy accumulated by the shaftless auger 25 is released, causing the sliding part 22 to move away from the rotating part 26. In addition, when the sliding part 22 moves away from the flange seat 10, it will move away from the fixed ring 19. During the movement, the cone 32 will be subjected to the squeezing force of the inner wall of the cone groove 29, which will cause the cone 32 to undergo elastic contraction deformation, thereby narrowing the opening of the powder outlet chamber 34. The narrowing of the opening of the powder outlet chamber 34 is relatively large or even closed. This can prevent the compressed air flow from entering the powder outlet chamber 34, that is, avoid a large amount of compressed air from entering the powder conveying pipe from the powder outlet chamber 34 when the shaftless auger 25 is in a compressed state. 11. The airflow impact on the dry powder causes it to be unable to be smoothly conveyed into the powder outlet chamber 34. After the sliding part 22 is reset, the opening of the powder outlet chamber 34 is open, and the shaftless spiral auger 25 is restored to its original shape. In this way, the flow resistance of compressed air in the mounting chamber 24 is small, and it is not easy to have a significant impact on the dry powder in the powder outlet chamber 34. This allows the dry powder to enter the mounting chamber 24 from the powder outlet chamber 34, and then mix into the abrasive to lubricate it. This makes the abrasive smoother to be conveyed in the mounting chamber 24. This allows the compressed air flow to smoothly convey the abrasive, so that the abrasive can impact the guide cone 16 at high speed. In addition, through lubrication, when the abrasive is separated by shear force, the dry powder on the surface of the abrasive can prevent the abrasive from clumping or adhering together again.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A sandblasting device for internal corrosion protection of oil casing, characterized in that, include: The bracket (9) has an arc-shaped clamp (8) at the top. Translation component, mounted on the bracket (9); The sandblasting pipe (5) is driven to be connected to the translation component and is coaxial with the arc-shaped clamp (8). The translation component is used to drive the sandblasting pipe (5) to move linearly. A flange seat (10) is connected through to the sandblasting pipe (5). The flange seat (10) is connected to a sandblasting seat (6). The sandblasting seat (6) has an installation cavity (24) inside. The sandblasting seat (6) has a sandblasting port (15) at one end away from the sandblasting pipe (5). The rotating part (26) is coaxially rotatably connected to the mounting cavity (24), and the end face of the rotating part (26) is provided with a through port (28) communicating with the sandblasting port (15). A shaftless spiral auger (25) is coaxially mounted in the mounting cavity (24) and rotates freely within the mounting cavity (24). One end of the shaftless spiral auger (25) is fixed to the end face of the rotating part (26) in the axial direction.

2. The anti-corrosion sandblasting device for oil casing according to claim 1, characterized in that, The end of the sandblasting pipe (5) away from the sandblasting seat (6) is connected to the sand storage tank (2) through the air pipe (3), and the air pipe (3) is also connected to the compressed air pipe (1).

3. The anti-corrosion sandblasting device for oil casing according to claim 1, characterized in that, The translation component includes a cylinder (7) horizontally mounted on the bracket (9), the cylinder (7) being driven by a connecting plate (4), and the sandblasting pipe (5) being fixedly inserted through the connecting plate (4).

4. The anti-corrosion sandblasting device for oil casing according to claim 1, characterized in that, The rotating part (26) is coaxially fixed to the end face of the ring gear (27), the sandblasting seat (6) is fixed to the motor seat (12), the motor seat (12) is installed with a motor (18), the motor (18) drives the transmission gear (13), the transmission gear (13) meshes with the ring gear (27), and the surface of the sandblasting seat (6) is provided with a clearance groove (14) for the transmission gear (13) to pass freely.

5. The anti-corrosion sandblasting device for oil casing according to claim 1, characterized in that, The end of the sandblasting seat (6) away from the sandblasting pipe (5) is fixedly connected to a guide part (17) by a plurality of connecting columns, and a guide cone (16) is fixedly connected to the side of the guide part (17) facing the sandblasting seat (6).

6. The anti-corrosion sandblasting device for oil casing according to claim 1, characterized in that, The shaftless spiral auger (25) has a sliding part (22) fixedly connected to one end away from the rotating part (26). The sliding part (22) is slidably engaged in the mounting cavity (24). The sliding part (22) is provided with a compression component, which is used to intermittently generate an axial force on the shaftless spiral auger (25) when the shaftless spiral auger (25) rotates.

7. The anti-corrosion sandblasting device for oil casing according to claim 6, characterized in that, The compression assembly includes a fixing ring (19) coaxially fixed to the end face of the flange seat (10), an mounting arm (20) fixed to the end face of the fixing ring (19), a roller (31) rotatably connected to the mounting arm (20), and an arc-shaped protrusion (30) fixed to the end face of the sliding part (22). The roller (31) and the arc-shaped protrusion (30) are used in conjunction.

8. The anti-corrosion sandblasting device for oil casing according to claim 7, characterized in that, A sealing ring (21) is coaxially fixed to the end face of the fixed ring (19). The sealing ring (21) is slidably inserted through the hole in the sliding part (22). A powder outlet cavity (34) is opened in the sealing ring (21). The powder outlet cavity (34) is connected to the mounting cavity (24). A powder conveying pipe (11) is inserted through the sandblasting seat (6). One end of the powder conveying pipe (11) is inserted into the sealing ring (21) and is connected to the powder outlet cavity (34).

9. The anti-corrosion sandblasting device for oil casing according to claim 8, characterized in that, The sealing ring (21) is integrally formed with a cone (32) at one end away from the fixed ring (19). The outer diameter of the cone (32) increases sequentially in the direction away from the fixed ring (19). A deformation groove (23) penetrating the powder outlet cavity (34) is provided around the cone (32). The sliding part (22) is provided with a cone groove (29) for the cone (32) to engage.

10. A sandblasting process for internal corrosion protection of oil casing, applied to the sandblasting apparatus according to any one of claims 1 to 9, characterized in that, include: The two ends of the oil casing are respectively engaged in the arc-shaped clamps (8) at both ends of the bracket (9), and the sandblasting pipe (5) is moved by the translation component, so that the sandblasting seat (6) moves into the oil casing. Compressed air flows in the blasting pipe (5) and delivers the abrasive to the mounting cavity (24) of the blasting seat (6). The abrasive is blocked by the shaftless spiral auger (25), causing the abrasive to accumulate in the mounting cavity (24). The rotating part (26) rotates, which in turn drives the shaftless spiral auger (25) to rotate. When the shaftless spiral auger (25) rotates, it delivers the abrasive from one side of the mounting cavity (24) to the other side and continuously sprays it out from the blasting nozzle (15).

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