Downhole filling tool for oil exploitation

Abstract

The invention relates to the technical field of oil exploitation equipment, and discloses an underground filling tool for oil exploitation, which comprises a sealing element for sealing a section to be filled, an activating element for activating the sealing element is arranged on the sealing element, and a removing element for removing residual materials on the well wall is arranged at the bottom end of the sealing element; through the gravity driving design of the counterweight ring of the activating piece, expansion activation of the sealing gasket can be achieved without an additional hydraulic or electric device, the underground structure is simplified, the fault probability in the high-temperature and high-pressure environment is reduced, the four sets of evenly-distributed top plates are matched with the downward moving groove, the guiding effect of the limiting block and the limiting groove is combined, and the sealing gasket is more stable. The balance weight ring is ensured to be balanced in stress when rotating and aligning, deflection and jamming are avoided, the synchronous plate and the lower pressing plate are symmetrically distributed to ensure that the sealing gasket is uniformly stressed, the synchronous plate and the lower pressing plate are synchronously expanded and attached to the well wall, the stability and efficiency of sealing activation are improved, and manual operation errors are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production equipment, in particular to a downhole filling tool used for oil production. Background Art

[0002] Oil production refers to the process of extracting oil from underground reservoirs. It is the core upstream link of the oil industry and is directly related to the development and utilization of oil resources. Oil production downhole filling refers to the operation technology of injecting filling materials into specific underground spaces such as wellbore, fractures, goaf, loss zone, etc. during the drilling, completion, repair or production process of oil production to achieve the purpose of stabilizing the well wall, blocking crossflow, supporting fractures, controlling formation pressure or improving recovery rate.

[0003] Chinese patent application publication number CN116877022A discloses a downhole filling tool for oil production. The tool comprises a connecting pipe, the connecting pipe being provided with L-shaped holes distributed in an annular pattern at equal intervals, the connecting pipe being provided with an annular cavity communicating with the L-shaped holes, an annular plate being slidably connected within the annular cavity, a first spring being fixedly connected between the annular plate and the connecting pipe and located within the annular cavity, a sliding rod being slidably connected to the connecting pipe, the connecting pipe being provided with an extrusion plate and a rubber sleeve, the extrusion plate being fixedly connected to the sliding rod. This patent protects the rubber sleeve to prevent the packer from contacting and abrading the casing well wall during the process of being lowered into the casing, and cleans the casing inner wall before the rubber sleeve expands to prevent material adhering to the casing inner wall from becoming stuck between the expanded rubber sleeve and the casing inner wall. When downhole pressure changes, the rubber sleeve always maintains maximum extrusion force to seal the annular cavity of the oil casing.

[0004] However, the above-mentioned existing technology has the following deficiencies: during use, the expansion of the rubber cylinder and the driving of related components rely on the hydraulic pressure formed by injecting sand-carrying fluid into the connecting pipe, which requires an additional hydraulic injection device, resulting in a relatively complex downhole structure. At the same time, the device includes multiple sliding matching components such as annular plates, slide rods, and fixed sleeves. Although the annular distribution design attempts to balance the force, under hydraulic drive, pressure fluctuations can easily lead to uneven force on each component, which may cause deflection and jamming. In addition, its activation requires manual insertion of the sealing ball and control of the hydraulic injection. There are certain manual operation steps, which can easily introduce operational errors. In addition, the hydraulic components have a relatively high probability of failure in the high-temperature and high-pressure downhole environment. Summary of the Invention

[0005] In order to solve the problems that during use, the downhole structure is relatively complex, pressure fluctuations easily lead to uneven force on various components, which may cause deflection and jamming, and there are certain manual operation steps, which easily introduce operational errors and have a relatively high probability of failure, the present invention provides a downhole filling tool for oil extraction.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a downhole filling tool for oil production, comprising: a sealing member for sealing a section to be filled, an activating member for activating the sealing member provided on the sealing member, and a removing member for removing residual material from the well wall provided at the bottom end of the sealing member; The sealing member includes an entry pipe inserted into the well, a lower partition plate is provided on the entry pipe, a lower sealing gasket is fixedly connected to the top of the lower partition plate, and an upper partition plate is provided on the entry pipe, and an upper sealing gasket is fixedly connected to the top of the upper partition plate; The activation member includes a top plate fixedly connected to the top of the upper partition plate, a counterweight ring is sleeved on the outside of the inlet pipe, an abutting groove is opened at the bottom end of the counterweight ring, a downward displacement groove is opened at the top end of the abutting groove, and the downward displacement groove is adapted to the abutting groove. In the initial state, the top end of the abutting groove abuts with the top end of the top plate, a sleeve is sleeved on the outside of the inlet pipe, the bottom end of the sleeve is fixedly connected to the connecting plate, the bottom end of the connecting plate passes through the counterweight ring and is fixedly connected to the lower pressure plate, and the side end of the connecting plate is fixedly connected to the synchronization plate; Among them, when the filling section needs to be sealed, the sleeve is rotated first to make the connecting plate and the counterweight ring rotate synchronously, so that the top plate enters the downward groove. Under the action of gravity, the counterweight ring moves downward to push the synchronous plate and the lower pressure plate, squeezing the upper sealing gasket and the lower sealing gasket to deform and abut against the well wall, completing the sealing.

[0007] As a further solution of the present invention: the synchronization plate is arranged above the upper sealing gasket, and the lower pressure plate is arranged above the lower sealing gasket; A limiting groove is provided on the inner side of the counterweight ring, a side end of the connecting plate is fixedly connected to a limiting block, the limiting block is slidably plugged into the limiting groove, and the limiting block is arranged above the synchronization plate.

[0008] As a further solution of the present invention: a feeding groove is provided at the side end of the inlet pipe, and the feeding groove is arranged between the lower sealing gasket and the upper partition plate, an annular groove is provided at the side end of the inlet pipe, and a through groove is provided at the top end of the lower partition plate.

[0009] As a further solution of the present invention: one end of the inlet pipe passes through the through groove, a connecting block is fixedly connected to the inner side of the through groove, and the connecting block is slidably connected to the annular groove.

[0010] As a further solution of the present invention: two groups of annular grooves are provided, which are respectively provided at the lower partition plate and the upper partition plate. The upper partition plate is also provided with a through groove and a connecting block.

[0011] As a further solution of the present invention: the removal member includes a connecting groove extending through the bottom end of the entry tube, the bottom end of the entry tube is fixedly connected to a connecting rod, and the bottom end of the connecting rod is fixedly connected to the material removal member.

[0012] As a further solution of the present invention: a fixing plate is slidably inserted in the connecting groove, a push plate is fixedly connected to the bottom end of the fixing plate, and a piston is fixedly connected to the top end of the fixing plate.

[0013] As a further solution of the present invention: the fixing plate is located outside the connecting rod, and the connecting rod passes through the push plate.

[0014] As a further solution of the present invention: the material removal part includes a cross bar fixedly connected to the side end of the connecting rod, the side end of the cross bar is connected with a rotating shaft, one end of the rotating shaft is connected with a scraper rod, the cross bar is rotatably connected to the rotating shaft, and the scraper rod is rotatably connected to the rotating shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention ensures uniform distribution of filler within the enclosed space through two symmetrically distributed trumpet-shaped feeding troughs, avoiding incomplete filling caused by local accumulation. Combined with the stepped edge design of the sealing gasket, it forms multiple sealing contacts with the wellbore wall after being compressed and expanded, significantly reducing the risk of filler leakage and ensuring the sealing reliability of the filling section. 2. The present invention utilizes a gravity-driven design for the counterweight ring of the activation element, eliminating the need for additional hydraulic or electric devices to achieve expansion and activation of the sealing gasket. This simplifies the downhole structure and reduces the probability of failure in high-temperature and high-pressure environments. Four sets of evenly distributed top plates cooperate with the downward displacement grooves, combined with the guiding effect of the limit blocks and limit grooves, to ensure balanced force during rotation and alignment of the counterweight ring, avoiding deflection and jamming. The symmetrical distribution of the synchronization plate and the lower pressure plate ensures uniform force on the sealing gasket, allowing them to expand synchronously and conform to the well wall, improving the stability and efficiency of seal activation and reducing manual operation errors. 3. The present invention uses the inverted conical push plate of the removal piece and the transmission structure of the material removal piece to make the opening angle of the scraper rod change linearly with the filler pressure, which can adapt to the range of well diameters. The stepped sealing design of the piston ensures leakage-free transmission of pressure and reliable fit between the scraper rod and the well wall. Multiple groups of circumferentially distributed material removal pieces cooperate with the linkage control of the ground lifting equipment and the drill floor turntable to enable the scraper rod to achieve full circumferential cleaning of the well wall without dead angles in the compound movement of rotation and upward movement, avoiding the falling off of residual materials and clogging the wellbore. At the same time, the design of the arc surface at the top of the scraper rod and the torsion spring not only improves the scraping efficiency of the residue in the hard formation, but also can automatically reset after cleaning, reducing the risk of jamming during tool recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sealing state of the overall structure of the present invention; Figure 3 Schematic diagram of the structure of the sealing member of the present invention; Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at point A; Figure 5 It is a schematic structural diagram of the counterweight ring of the present invention; Figure 6 It is a schematic structural diagram of the activation member of the present invention; Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at point B; Figure 8 It is a structural schematic diagram of the connecting rod of the present invention; Figure 9 It is a structural schematic diagram of the fixing plate of the present invention; Figure 10 It is a structural schematic diagram of the material removal part of the present invention.

[0017] In the figure: 1. sealing member; 11. inlet pipe; 12. lower partition plate; 13. lower sealing gasket; 14. upper partition plate; 15. upper sealing gasket; 16. feeding groove; 17. ring groove; 18. through groove; 19. connecting block; 2. activation member; 21. top plate; 22. counterweight ring; 23. limit groove; 24. abutment groove; 25. downward movement groove; 26. sleeve; 27. connecting plate; 28. synchronization plate; 29. ​​lower pressure plate; 210. limit block; 3. removal member; 31. connecting groove; 32. connecting rod; 33. material removal member; 331. cross bar; 332. rotating shaft; 333. scraper rod; 34. fixed plate; 35. piston; 36. push plate. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Reference Figures 1 to 10 In an embodiment of the present invention, a downhole filling tool for oil extraction includes: a seal 1 for sealing a section to be filled in an oil well, an activating member 2 for activating the seal 1 is provided on the seal 1, and a removing member 3 for removing residual material from the well wall during the upward movement is provided at the bottom end of the seal 1.

[0020] The seal 1 includes an entry pipe 11 that is inserted into the well. It is made of high-strength alloy material, and the wall thickness is adapted to the high-pressure environment downhole. The hollow channel in the pipe is used to transport fillers. A lower partition plate 12 and an upper partition plate 14 are provided on the entry pipe 11. Both are annular metal plates with an outer diameter slightly smaller than the inner diameter of the wellbore. The edges are rounded to reduce the resistance to lowering. The top of the lower partition plate 12 is fixedly connected to a lower sealing gasket 13 by bolts, and the top of the upper partition plate 14 is similarly fixed with an upper sealing gasket 15. Both are made of oil-resistant rubber material, and the edges are stepped to improve the sealing after expansion. Two sets of feeding grooves 16 are symmetrically provided on the side ends of the entry pipe 11. The grooves are trumpet-shaped and are located between the lower sealing gasket 13 and the upper partition plate 14 to ensure that the filler is directly injected into the cavity formed by the two sealing gaskets. The closed space has two sets of annular grooves 17 on the side ends of the entry pipe 11, which correspond to the installation positions of the lower partition plate 12 and the upper partition plate 14 respectively. The cross-section of the annular groove 17 is T-shaped and has a built-in wear-resistant coating. A through groove 18 is provided at the center of the lower partition plate 12 and the upper partition plate 14. Two sets of connecting blocks 19 are symmetrically fixedly connected to the inner side of the through groove 18. The connecting blocks 19 are T-shaped and slidably connected to the annular groove 17 and can be flexibly moved along the axial direction of the entry pipe 11. When the target well section needs to be sealed, the entry pipe 11 is first lowered to the section to be filled. During filling, the external pump pressure transports the filler through the internal channel of the entry pipe 11 to the feeding tank 16. The two sets of symmetrical notches allow the filler to flow evenly into the closed space between the two sealing gaskets. After the filling is completed, the pressure is maintained until the filler is initially solidified.

[0021] The above solution is adopted: by using the inlet pipe 11 made of high-strength alloy material, the structural stability of the tool is ensured in the deep well high-pressure environment, and the two sets of symmetrically distributed feeding grooves 16 ensure that the filler is evenly distributed in the closed space to avoid local accumulation. Through the cooperation of the T-shaped ring groove 17 and the connecting block 19, the radial displacement of the partition plate is limited, and the axial adjustment freedom is retained, thereby improving the operational flexibility. The stepped edge design of the sealing gasket enhances the sealing fit after pressure expansion and reduces the risk of filler leakage.

[0022] The activation member 2 includes a top plate 21 fixed to the top of the upper partition plate 14 by welding. The top plate 21 is forged with wear-resistant alloy steel. The overall arc shape is adapted to the inner curvature of the counterweight ring 22. The front view is a trapezoid with a narrow top and a wide bottom. The four groups of top plates 21 are evenly distributed along the circumferential direction of the top of the upper partition plate 14. The top edge is rounded to reduce rotational friction. A counterweight ring 22 is provided on the outside of the entry pipe 11. It is a solid cast iron ring with a weight adapted to the downhole pressure environment. A gap is retained between its inner wall and the outer wall of the entry pipe 11 for easy sliding. An annular abutment groove 24 is opened along the circumference of the bottom end. The width of the abutment groove 24 is slightly larger than the thickness of the top plate 21. , four groups of downward moving grooves 25 are opened at the top of the abutment groove 24. The downward moving groove 25 is a rectangular groove with a width adapted to the top plate 21. A sleeve 26 is provided on the outside of the entry pipe 11. The inner wall and the outer wall of the entry pipe 11 are connected by a bearing to achieve flexible rotation. Two groups of connecting plates 27 are symmetrically welded at the bottom end. The connecting plate 27 is an arc-shaped steel plate, the bottom end of which passes through the preset through hole of the counterweight ring 22 and is welded and fixed with a lower pressure plate 29. A synchronous plate 28 is welded to the side end of the connecting plate 27. The synchronous plate 28 is an annular steel plate with a diameter smaller than the inner circle diameter of the top plate 21 to avoid interference. It is horizontally arranged just above the upper sealing gasket 15, and the lower pressure plate 29 is aligned with the lower sealing gasket 13 is an annular plate adapted for use, and its edge is aligned with the lower sealing gasket 13. Two sets of limit grooves 23 are symmetrically opened on the inner side of the counterweight ring 22. The groove is rectangular and its length runs through the upper and lower ends of the counterweight ring 22. Built-in grease reduces friction. Two sets of limit blocks 210 are welded at the corresponding positions on the side ends of the connecting plate 27. The limit blocks 210 are rectangular steel blocks with a size that precisely matches the limit grooves 23. They are slidably inserted into the limit grooves 23 and are located above the synchronous plate 28 to ensure the stability of the rotation transmission. When the sealing function needs to be activated, the sleeve 26 is first driven to rotate by the ground drive device, and the sleeve 26 drives the two sets of connecting plates 27 to rotate synchronously. Due to the limit blocks 2 10 is restricted by the sliding insertion of the limit groove 23, and the counterweight ring 22 rotates synchronously with the connecting plate 27 until the four groups of top plates 21 are accurately aligned with the four groups of downward moving grooves 25 and enter the downward moving grooves 25. At this time, the counterweight ring 22 loses the support of the top plate 21 and slides downward along the axial direction of the entry pipe 11 under the action of its own gravity. Its bottom end first contacts the synchronous plate 28 and pushes it downward. The synchronous plate 28 squeezes the upper sealing gasket 15 to make it expand radially. At the same time, the connecting plate 27 drives the lower pressure plate 29 to move downward synchronously. The lower pressure plate 29 squeezes the lower sealing gasket 13 to make it expand radially synchronously until the two groups of sealing gaskets are tightly abutted against the well wall, completing the sealing activation.

[0023] The above scheme is adopted: through the cooperation of four groups of evenly distributed top plates 21 and downward displacement grooves 25, the force balance of the counterweight ring 22 during rotation and alignment is ensured to avoid deflection and jamming; through the sliding plug-in structure of the limit block 210 and the limit groove 23, the synchronous rotation of the sleeve 26 and the counterweight ring 22 is achieved to ensure the alignment accuracy; the gravity of the counterweight ring 22 is used as the driving force, and no additional hydraulic device is required, which simplifies the structure and improves the adaptability to the downhole environment; through the symmetrical distribution design of the synchronization plate 28 and the lower pressure plate 29, it is ensured that the upper sealing gasket 15 and the lower sealing gasket 13 are evenly stressed, and the sealing reliability is improved; through the sleeve 26 and the bearing connection of the entry pipe 11, the rotation resistance is reduced, which is convenient for ground operation and control.

[0024] The removal piece 3 includes a connecting groove 31 that is opened at the bottom end of the entry pipe 11. There are two groups of connecting grooves 31. The two groups of connecting grooves 31 are symmetrically distributed along the radial direction of the entry pipe 11. The bottom end of the entry pipe 11 is fixedly connected to a connecting rod 32 by bolts. The connecting rod 32 is a steel column. The bottom end of the connecting rod 32 is evenly fixedly connected to multiple groups of material removal pieces 33 in the circumferential direction. Each group of material removal pieces 33 is fixed to the side end of the connecting rod 32 by argon arc welding. A group of fixing plates 34 is slidably inserted in each group of connecting grooves 31. The fixing plates 34 are clearance-matched with the connecting grooves 31. A push plate 36 is welded and fixed to the bottom end of the fixing plate 34. The push plate 36 is an inverted cone structure and fits with the material removal piece 33. The top of the fixing plate 34 is fixedly connected to a piston 35 by a countersunk screw. The piston 35 is a stepped structure. Made of polyurethane, two polyurethane U-shaped sealing rings are set on the outer circle to form an interference fit with the inner wall of the entry pipe 11. Two sets of fixed plates 34 are symmetrically distributed on the outside of the connecting rod 32. The connecting rod 32 passes through the central through hole of the push plate 36. The material removal part 33 includes a cross bar 331 welded to the side end of the connecting rod 32. The side end of the cross bar 331 is connected to the rotating shaft 332 through a deep groove ball bearing. The rotating shaft 332 is a 40Cr steel shaft. The shaft end is positioned with the inner ring of the bearing through the shaft shoulder. One end of the rotating shaft 332 is connected to the scraper rod 333 through a flat key. The top of the scraper rod 333 is an arc surface, which is adapted to the inner wall of the oil well. The cross bar 331 and the scraper rod 333 are naturally V-shaped. A torsion spring is set at the hinge between the two. When filler is injected into the sealing area through the entry pipe 11, the filler The filling pressure pushes the piston 35 down along the inner wall of the entry pipe 11, driving the fixed plate 34 to slide along the connecting groove 31, and the push plate 36 moves down accordingly and squeezes the inner side of the scraper rod 333, forcing the scraper rod 333 to open outward around the rotating shaft 332 until the top well wall is completely in contact. After the filling operation is completed, the ground lifting equipment is started to lift the tool, and the entry pipe 11 is driven to rotate by the drill floor turntable. The scraper rod 333 scrapes off the residual filler and mud cake on the well wall by rotating the arc surface during the upward movement of the tool. The ground lifting equipment and the drill floor turntable are the core power equipment used for downhole operations in oil production. The ground lifting equipment mainly refers to the hydraulic workover rig, whose core is composed of a double-drum winch driven by a hydraulic pump, a four-link derrick and an intelligent control system. The wheel group realizes load diversion, and the big hook is connected to the bottom of the traveling block. The big hook is rigidly connected to the lifting short section at the top of the entry pipe 11 through a lifting ring. During operation, the control system can accurately adjust the lifting speed. The drill floor turntable is a 200-type mechanical transmission turntable, driven by an explosion-proof motor, and outputs torque through a three-stage gear reduction box. The turntable table and the square drill rod cooperate to realize centering transmission. The lower end of the square drill rod is connected to the drill string at the top of the entry pipe 11 through a conversion joint. Its core function is to drive the entry pipe 11 to rotate by outputting stable torque. The speed can be adjusted by the frequency conversion system to form a linkage control with the ground lifting equipment to ensure that the scraper 333 can achieve well wall cleaning in the compound movement of rotation and upward movement. When the two work together, the lifting equipment controls the axial movement speed of the tool, and the turntable provides circumferential rotation power.The PLC control system realizes proportional linkage between the rotation speed and the lifting speed, which not only ensures the continuous cutting of the well wall by the scraper 333, but also avoids overlapping or missing scrapes due to speed mismatch.

[0025] The above scheme is adopted: through two groups of symmetrically distributed connecting grooves 31 and fixed plates 34, it is ensured that the push plate 36 applies force in both directions and synchronously, avoiding unilateral deviation of the scraper rod 333. The transmission structure of the inverted conical push plate 36 and the removal piece 33 realizes the linear adjustment of the opening angle of the scraper rod 333 with the filler pressure, adapting to the well diameter range. The stepped sealing design of the piston 35 ensures that the filler pressure is transmitted to the push plate 36 without leakage. Multiple groups of circumferentially distributed removal pieces 33 realize the cleaning of the well wall without dead angles, preventing the fall of residues and causing blockage of the wellbore.

[0026] The working principle of the present invention is as follows: during operation, the downhole filling tool is first lowered as a whole to the section to be filled in the oil well by the ground lifting equipment. During the lowering process, the lower sealing gasket 13 and the upper sealing gasket 15 accurately cover the upper and lower boundaries of the section to be filled. Then, the sleeve 26 is driven to rotate by the ground driving device. The sleeve 26 rotates relative to the inlet pipe 11 through the inner wall bearing, and at the same time drives the two sets of connecting plates 27 to rotate synchronously. Because the limit block 210 at the side end of the connecting plate 27 is slidably plugged into the limit groove 23 on the inner side of the counterweight ring 22, the counterweight ring 22 rotates synchronously with the connecting plate 27 until the upper The four groups of top plates 21 at the top of the partition plate 14 are precisely aligned with the four groups of downward moving grooves 25 at the bottom of the counterweight ring 22 and enter the groove. At this time, the counterweight ring 22 loses the support of the top plate 21 and moves downward axially along the inlet pipe 11 under the action of its own gravity. Its bottom end first pushes the synchronous plate 28 to squeeze the upper sealing gasket 15, and at the same time drives the lower pressure plate 29 to move downward synchronously through the connecting plate 27 to squeeze the lower sealing gasket 13, so that the two groups of oil-resistant rubber sealing gaskets expand radially due to axial pressure, and the stepped edge fits tightly with the well wall, completing the sealing reinforcement of the filling section. Then the external pump pressure system is started to pump the filler through the inlet The hollow channel of the tube 11 is transported to the feeding tank 16, and the two sets of symmetrically distributed trumpet-shaped notches evenly introduce the filler into the closed space between the lower sealing gasket 13 and the upper sealing gasket 15. After the filler fills the space, the pump pressure is maintained until the filler initially solidifies, and the material filling of the filling section is initially completed. During the filling process, the filler pushes the piston 35 to move downward along the inner wall of the inlet tube 11, driving the fixed plate 34 to slide along the connecting groove 31, and the inverted cone push plate 36 moves downward and squeezes the scraper 333 of the material removal part 33, forcing the scraper 333 to open outward around the rotating shaft 332 until the top The arc surface is in perfect contact with the well wall. When the filling operation is completed, the ground hydraulic workover rig and the drill floor rotary table are started. The workover rig drives the tool upward through the crown block-traveling block pulley group. At the same time, the drill floor rotary table is driven by the kelly drill pipe to rotate at a high speed. The scraper rod 333 scrapes off the residual filler and mud cake attached to the well wall through the combined motion of rotating arc surface and moving upward. During the cleaning process, the PLC system controls the lifting speed and speed in a linked manner to ensure uniform scraping without omission. After the operation is completed, the filler pressure is released, the scraper rod 333 is reset under the action of the torsion spring, and the tool is recovered to the ground as a whole.Two groups of symmetrically distributed trumpet-shaped feeding grooves 16 ensure that the filler is evenly distributed in the closed space, avoiding incomplete filling caused by local accumulation. The stepped edge design of the sealing gasket allows it to form multiple sealing contacts with the well wall after being pressurized and expanded, significantly reducing the risk of filler leakage and ensuring the sealing reliability of the filling section. The gravity-driven design of the counterweight ring 22 of the activation part 2 does not require additional hydraulic or electric devices to achieve expansion activation of the sealing gasket, simplifying the downhole structure and reducing the probability of failure in high temperature and high pressure environments. Four groups of evenly distributed top plates 21 cooperate with the downward groove 25, combined with the guiding effect of the limit block 210 and the limit groove 23, to ensure that the counterweight ring 22 is balanced when rotating and aligning, avoiding deflection and jamming. The symmetrical distribution of the synchronization plate 28 and the lower pressure plate 29 ensures that the sealing gasket is evenly stressed, making the two synchronized. The expansion and contact with the wellbore wall improves the stability and efficiency of seal activation and reduces manual operation errors. The transmission structure of the inverted conical push plate 36 of the removal element 3 and the material removal element 33 allows the opening angle of the scraper rod 333 to change linearly with the filler pressure, adapting to the range of wellbore diameters. The stepped sealing design of the piston 35 ensures leak-free pressure transmission and reliable contact between the scraper rod 333 and the wellbore wall. Multiple groups of circumferentially distributed material removal elements 33 are coordinated with the surface lifting equipment and the drilling floor rotary table to achieve full circumferential cleaning of the wellbore wall through the combined motion of rotation and upward movement, preventing residual material from falling and clogging the wellbore. At the same time, the design of the curved surface at the top of the scraper rod 333 and the torsion spring not only improves the efficiency of scraping residue from hard formations, but also automatically resets after cleaning, reducing the risk of tool jamming during tool recovery.

[0027] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. Downhole filling tools for oil production, including: A sealing member (1) for sealing a section to be filled, characterized in that an activating member (2) for activating the sealing member (1) is provided on the sealing member (1), and a removing member (3) for removing residual material from the well wall is provided at the bottom end of the sealing member (1); The sealing member (1) comprises an entry pipe (11) inserted into the well, a lower partition plate (12) is provided on the entry pipe (11), a lower sealing gasket (13) is fixedly connected to the top end of the lower partition plate (12), an upper partition plate (14) is provided on the entry pipe (11), and an upper sealing gasket (15) is fixedly connected to the top end of the upper partition plate (14); The activation member (2) includes a top plate (21) fixedly connected to the top of the upper partition plate (14); a counterweight ring (22) is sleeved on the outside of the inlet pipe (11); a bottom end of the counterweight ring (22) is provided with an abutting groove (24); a top end of the abutting groove (24) is provided with a downward displacement groove (25); the downward displacement groove (25) is adapted to the abutting groove (24); in an initial state, the top end of the abutting groove (24) abuts against the top end of the top plate (21); a sleeve (26) is sleeved on the outside of the inlet pipe (11); a bottom end of the sleeve (26) is fixedly connected to a connecting plate (27); a bottom end of the connecting plate (27) passes through the counterweight ring (22) and is fixedly connected to a lower pressure plate (29); a side end of the connecting plate (27) is fixedly connected to a synchronous plate (28); When the filling section needs to be sealed, the sleeve (26) is first rotated to make the connecting plate (27) and the counterweight ring (22) rotate synchronously, so that the top plate (21) enters the downward groove (25). Under the action of gravity, the counterweight ring (22) moves downward to push the synchronous plate (28) and the lower pressure plate (29), squeezing the upper sealing gasket (15) and the lower sealing gasket (13) to deform and abut against the well wall, thereby completing the sealing.

2. The downhole filling tool for oil production according to claim 1, characterized in that: The synchronization plate (28) is arranged above the upper sealing gasket (15), and the lower pressure plate (29) is arranged above the lower sealing gasket (13); A limiting groove (23) is provided on the inner side of the counterweight ring (22); a side end of the connecting plate (27) is fixedly connected to a limiting block (210); the limiting block (210) is slidably plugged into the limiting groove (23); and the limiting block (210) is arranged above the synchronization plate (28).

3. The downhole filling tool for oil production according to claim 2, characterized in that: A feeding groove (16) is provided at the side end of the inlet pipe (11), and the feeding groove (16) is arranged between the lower sealing gasket (13) and the upper partition plate (14). An annular groove (17) is provided at the side end of the inlet pipe (11), and a through groove (18) is provided at the top end of the lower partition plate (12).

4. The downhole filling tool for oil production according to claim 3, characterized in that: One end of the inlet pipe (11) passes through the through groove (18), a connecting block (19) is fixedly connected to the inside of the through groove (18), and the connecting block (19) is slidably connected to the annular groove (17).

5. The downhole filling tool for oil production according to claim 4, characterized in that: Two groups of annular grooves (17) are provided, which are respectively provided at the lower partition plate (12) and the upper partition plate (14). The upper partition plate (14) is also provided with a through groove (18) and a connecting block (19).

6. The downhole filling tool for oil production according to claim 5, characterized in that: The removal member (3) comprises a connecting groove (31) extending through the bottom end of the inlet pipe (11), a connecting rod (32) is fixedly connected to the bottom end of the inlet pipe (11), and a material removal member (33) is fixedly connected to the bottom end of the connecting rod (32).

7. The downhole filling tool for oil production according to claim 6, characterized in that: A fixed plate (34) is slidably inserted into the connecting groove (31), a push plate (36) is fixedly connected to the bottom end of the fixed plate (34), and a piston (35) is fixedly connected to the top end of the fixed plate (34).

8. The downhole filling tool for oil production according to claim 7, characterized in that: The fixing plate (34) is located outside the connecting rod (32), and the connecting rod (32) passes through the push plate (36).

9. The downhole filling tool for oil production according to claim 8, characterized in that: The material removal member (33) comprises a cross bar (331) fixedly connected to the side end of the connecting rod (32); a rotating shaft (332) is passed through the side end of the cross bar (331); a scraping rod (333) is passed through one end of the rotating shaft (332); the cross bar (331) is rotatably connected to the rotating shaft (332); and the scraping rod (333) is rotatably connected to the rotating shaft (332).

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