Rotary oil layer protection device for well washing

Abstract

The invention relates to the technical field of oil well protection, in particular to a rotary well washing oil layer protection device which comprises an upper connector, a ball cover, a center pipe and a lower connector, a plurality of liquid inlet holes are formed in the outer wall, close to the ball cover, of the upper connector, and a first stop pin, a check ring, a valve ball and a valve seat are arranged in the ball cover; a sand blocking assembly is arranged on the upper connector in a sleeving mode, a righting assembly is fixedly arranged at one end of the sand blocking assembly, a shifting fork and a deblocking assembly are arranged on the center pipe in a sleeving mode, and a linkage assembly and a setting assembly are arranged on the deblocking assembly in a sleeving mode. The production time is effectively prolonged, the rotating force is converted into the anchoring force, torque transmission is stable, anchoring is more reliable, the sand blocking assembly can prevent silt and other impurities from precipitating around the setting assembly, the unsetting success rate is increased, and the situation that a pipe column is clamped in the unsetting process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil well protection, and in particular to an oil layer protection device for rotary well washing. Background Art

[0002] In the production of heavy oil, wax deposition, and deep pumping wells, it is necessary to frequently perform hot water circulation well washing on the pump and the oil pipe on the pump to maintain normal production of the well. As the oil field production has entered the middle and late stages, the oil well pressure is relatively low, and some oil well formations are relatively empty. During the well washing process, a large amount of well washing fluid enters the formation, causing oil layer pollution. For low-liquid production and low-submergence wells, hot well washing water is prone to backflow into the oil layer. It usually takes 3-7 days for the hot well to restore normal water content, affecting normal oil production and directly affecting oil production efficiency. Therefore, an oil layer protection device is needed.

[0003] There are two commonly used oil layer protection devices: double leather cup seal and Y211 packer.

[0004] The disadvantages of the Y211 packer are: if the string is pressurized too little, the rubber tube will not be tightly sealed, resulting in segmentation failure and failure to protect the oil layer; if the string is pressurized too much, the string will be severely bent, causing eccentric wear of the rod and pipe.

[0005] The disadvantages of the leather cup type oil layer protection device are: 1. Affected by the leather cup structure, during the process of the tool being lowered into the well, the leather cup always contacts the inner wall of the casing, causing the leather cup to wear, resulting in failure of the seal and inability to protect the oil layer; 2. During the process of lifting the tubing string, the leather cup is always in an expanded state, forming a piston effect, and the rubber is easy to fall off, resulting in obstruction of the subsequent sand flushing and well washing process.

[0006] Therefore, it is urgent to improve the problems existing in the above two types of oil layer protection devices. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a rotary well-washing oil layer protection device to solve the problems raised in the above background technology.

[0008] Based on the above-mentioned purpose, the present invention provides an oil layer protection device for rotary well washing, including an upper joint, a ball cover, a center tube and a lower joint, one end of the upper joint is sleeved on one end of the ball cover and fixedly connected, the other end of the ball cover is sleeved on one end of the center tube and fixedly connected, the other end of the center tube is inserted into one end of the lower joint and fixedly connected, a plurality of liquid inlet holes are provided on the outer wall of the upper joint near the ball cover, a first stop pin, a stop ring, a valve ball and a valve seat are provided inside the ball cover, one end of the valve seat is abutted against one end of the center tube, and both ends of the first stop pin are inserted into the inner part of the ball cover The cam is mounted on the valve body, and the two ends of the retaining ring are respectively against the first retaining pin and the valve seat, and the valve ball is arranged inside the retaining ring. A sand retaining assembly is sleeved on the upper joint, and a straightening assembly is fixedly arranged at one end of the sand retaining assembly. A shift fork and an unsealing assembly are sleeved on the central tube, and one end of the shift fork is attached to the end of the straightening assembly away from the sand retaining assembly, and a linkage assembly and a seat sealing assembly are sleeved on the unsealing assembly. One end of the seat sealing assembly is fixedly connected to the end of the shift fork away from the straightening assembly, and the other end is transmission-connected to one end of the linkage assembly, and the end of the linkage assembly away from the seat sealing assembly is fixedly connected to the lower joint.

[0009] Preferably, the sand retaining assembly comprises: A first retaining ring, sleeved on the upper joint and connected by clamping; The sand-blocking rubber cylinder is bowl-shaped and sleeved on the upper joint. One end of the sand-blocking rubber cylinder abuts against the first baffle ring, and the other end abuts against the straightening assembly.

[0010] Preferably, the straightening assembly comprises: A centralizing body, which is sleeved on the ball cover, one end of the centralizing body is fitted with one end of the upper joint, and the other end is fitted with the shift fork, and a first annular mounting groove is provided on the outer wall of the centralizing body; An upper pressure ring is sleeved on the centralizing body, one end of the upper pressure ring abuts against the sand-blocking rubber cylinder, and the other end extends out of the first annular mounting groove for a certain distance; A lower pressure ring is sleeved on one end of the centralizing body close to the shift fork and connected by clamping, and one end of the lower pressure ring extends out of the first annular mounting groove for a certain distance; Multiple righting flaps are arranged in the first annular mounting groove, and the two ends of each righting flap are respectively abutted against the inner wall of the upper pressure ring and the inner wall of the lower pressure ring. At least two righting springs are arranged inside each righting flap, and one end of each righting spring passes through the righting flap and abuts against the first annular mounting groove.

[0011] Preferably, a second annular mounting groove is provided at a location of the straightening body near the shift fork, an anchor shoe positioning block is fixedly provided inside the second annular mounting groove, a hoop spring is sleeved inside the second annular mounting groove, one end of the hoop spring is fixedly connected to the anchor shoe positioning block, and the other end is clamped on the shift fork, and a plurality of roller anchor shoes are sleeved on the hoop spring.

[0012] Preferably, a first rubber ring is provided between the valve seat and the ball cover, and the first rubber ring is clamped on the outer wall of the valve seat.

[0013] Preferably, the deblocking component comprises: An unsealing tube is sleeved on the central tube, one end of which is drivingly connected to the seat seal assembly, at least one second rubber ring is provided between the unsealing tube and the central tube, and the second rubber ring is clamped on the central tube; The shear nail tube is sleeved on a part of the central tube near the lower joint, one end of the shear nail tube is fitted with one end of the unsealing tube, and the shear nail tube and the central tube are fixedly connected by at least one unsealing shear nail and at least one soluble shear nail.

[0014] Preferably, the sealing assembly comprises: A cone, one end of which is sleeved on the fork and fixedly connected, and the other end of which is sleeved on the unsealing tube and fixedly connected; The cava holder is sleeved on the central tube, one end of the cava holder is drivingly connected to the linkage assembly, and the other end is slidingly connected to be provided with a plurality of cava, and each of the cava's ends away from the cava holder is provided with a conical surface that fits the cone.

[0015] Preferably, the linkage component includes: A sealing tube, which is sleeved on the unsealing tube, at least one third rubber ring is provided between the sealing tube and the unsealing tube, the third rubber ring is clamped on the unsealing tube, one end of the sealing tube is inserted in the cava holder, and at least one first slide groove is provided on the outer wall of the other end; A short rubber tube is sleeved on the isolation tube, and one end of the short rubber tube is fitted with one end of the cavatole; A long rubber tube is sleeved on the isolation tube, and both ends of the long rubber tube are provided with spacer rings, one side of the spacer ring away from the long rubber tube is fitted with the short rubber tube, and a fourth rubber ring is provided between each of the spacer rings and the isolation tube, and each of the fourth rubber rings is respectively clamped on the spacer ring; An upper thrust tube is sleeved on the isolation tube, and one end of the upper thrust tube is fitted with a spacer ring at one end of the long rubber tube away from the short rubber tube; An upper locking block is arranged between the upper thrust tube and the isolation tube, one end of the upper locking block abuts against the inner wall of the upper thrust tube, the upper locking block and the upper thrust tube are fixedly connected by starting shear nails, a limit pin is passed through the upper locking block, and the limit pin is arranged inside the first slide groove; A control lock block is inserted into the unsealing tube, one end of the control lock block is inserted into the central tube, and the other end is pressed against the inner wall of the upper lock block; A lead screw tube is sleeved on the unsealing tube and fixedly connected, and one end of the lead screw tube passes through the upper thrust tube and abuts against the control lock block; A lower thrust tube is sleeved on the screw tube, one end of the lower thrust tube is arranged inside the upper thrust tube, the lower thrust tube is fixedly connected to the upper thrust tube, and one end of the lower thrust tube abuts against an end of the upper locking block away from the short rubber tube; A nut, sleeved on the screw tube, the nut is threadedly connected to the screw tube, and one end of the nut is sleeved on the lower thrust tube and fixedly connected; A second retaining ring is sleeved on the unsealing tube, one end of the second retaining ring is sleeved on the lead screw tube and fixedly connected, and one end of the second retaining ring abuts against one end of the nut; An unblocking block is inserted into the unblocking tube, one end of the unblocking block is attached to the central tube, and the other end is clamped in the second retaining ring, and an annular groove is provided on the central tube; A reducer, sleeved on the lower joint, the reducer is fixedly connected to the lower joint; A key slot body, one end of which is sleeved on the second retaining ring, and the other end of which is sleeved on the reducer, the key slot body is fixedly connected to the reducer, a sliding block is slidably connected on the key slot body, and the sliding block is fixed to a place of the key slot body close to the reducer through a slider shear pin; The torque tube is sleeved on the keyway body, one end of the torque tube is sleeved on the nut and fixedly connected by at least two pins, and a second slide groove is provided on the outer wall of the other end, and the sliding block is arranged in the second slide groove.

[0016] Beneficial effects of the present invention: 1. The device can effectively avoid the bending and eccentric wear of the pipe string caused by the conventional pressurized setting and anchoring method, effectively extending the production time; 2. The device converts rotational force into anchoring force, the torque transmission is stable, and the anchoring is more reliable; 3. The rubber cylinder is located at the lower end of the cava tube, and the upper thrust tube directly squeezes the rubber cylinder to make the isolation more thorough, and the sealing force is transmitted more directly, which improves the well washing efficiency and reduces the well washing time; 4. The sand retaining rubber cylinder can prevent impurities such as mud and sand from settling around the rubber cylinder and slips, thereby increasing the success rate of unblocking and avoiding the situation where the pipe string is stuck during unblocking; 5. The unsealing pipe adopts a combination of soluble shear nails and unsealing shear nails, which not only ensures the shear strength when the well washing protection device is lowered, but also reduces the unsealing lifting force when the well washing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the upper half of the overall structure of an embodiment of the present invention; Figure 3 A top view and cross-sectional plan view of the second annular mounting groove of an embodiment of the present invention Figure 4 It is a schematic diagram of the lower half of the overall structure of an embodiment of the present invention.

[0019] The markings in the figure are: 1. Upper joint; 2. Stop pin; 3. First stop ring; 4. Sand-blocking rubber tube; 5. Stop ring; 6. Valve ball; 7. Valve seat; 8. First rubber ring; 9. Upper pressure ring; 10. Ball cover; 11. Righting block; 12. Righting spring; 13. Lower pressure ring; 14. Righting body; 15. Hoop spring; 16. Fork; 17. Cone; 18. Center tube; 19. Second rubber ring; 20. Slip; 21. Slip support; 22. Unsealing tube; 23. Third rubber ring; 24. Short rubber tube; 25. Long rubber tube; 26. Packing tube; 27. Four rubber rings; 28. Spacer ring; 29. ​​Upper thrust tube; 30. Upper locking block; 31. Limit pin; 32. Start shear pin; 33. Control locking block; 34. Lower thrust tube; 35. Screw tube; 36. Nut; 37. Pin; 38. Unlocking block; 39. Second retaining ring; 40. Torque tube; 41. Keyway body; 42. Unlocking shear pin; 43. Soluble shear pin; 44. Shear pin tube; 45. Slider shear pin; 46. Sliding block; 47. Lower joint; 48. Reducer; 49. Roller anchor shoe; 50. Anchor shoe positioning block. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] like Figures 1 to 4 As shown, a rotary well washing oil layer protection device comprises an upper joint 1, a ball cover 10, a center pipe 18 and a lower joint 47, one end of the upper joint 1 is sleeved on one end of the ball cover 10 and fixedly connected, the other end of the ball cover 10 is sleeved on one end of the center pipe 18 and fixedly connected, the other end of the center pipe 18 is inserted into one end of the lower joint 47 and fixedly connected, a plurality of liquid inlet holes are provided on the outer wall of the upper joint 1 near the ball cover 10, a first stop pin 2, a stop ring 5, a valve ball 6 and a valve seat 7 are provided inside the ball cover 10, one end of the valve seat 7 is abutted against one end of the center pipe 18, and both ends of the first stop pin 2 are inserted into the ball cover 1 0, the two ends of the retaining ring 5 are respectively abutted against the first retaining pin 2 and the valve seat 7, the valve ball 6 is arranged inside the retaining ring 5, the upper joint 1 is provided with a sand retaining assembly, one end of the sand retaining assembly is fixedly provided with a straightening assembly, the center tube 18 is provided with a shift fork 16 and an unsealing assembly, one end of the shift fork 16 is attached to the end of the straightening assembly away from the sand retaining assembly, the unsealing assembly is provided with a linkage assembly and a seat sealing assembly, one end of the seat sealing assembly is fixedly connected to the end of the shift fork 16 away from the straightening assembly, and the other end is transmission-connected to one end of the linkage assembly, and the end of the linkage assembly away from the seat sealing assembly is fixedly connected to the lower joint 47.

[0023] As an optional embodiment, the sand retaining assembly includes: A first retaining ring 3 is sleeved on the upper joint 1 and connected by a clamp; The sand-blocking rubber tube 4 is bowl-shaped and sleeved on the upper joint 1 . One end of the sand-blocking rubber tube 4 abuts against the first baffle ring 3 , and the other end abuts against the straightening assembly.

[0024] For example, by providing the sand-blocking rubber cylinder 4, impurities in the oil are prevented from entering around the locking portion of the seat seal assembly and affecting the unsealing action.

[0025] As an optional embodiment, the straightening assembly includes: A centralizing body 14 is sleeved on the ball cover 10, one end of the centralizing body 14 is fitted with one end of the upper joint 1, and the other end is fitted with the shift fork 16, and a first annular mounting groove is provided on the outer wall of the centralizing body 14; An upper pressure ring 9 is sleeved on the centralizing body 14, one end of the upper pressure ring 9 abuts against the sand-blocking rubber tube 4, and the other end extends out of the first annular mounting groove for a certain distance; A lower pressure ring 13 is sleeved on one end of the centralizing body 14 close to the fork 16 and connected by clamping, and one end of the lower pressure ring 13 extends out of the first annular mounting groove for a certain distance; Multiple righting flaps are arranged in the first annular mounting groove, and the two ends of each righting flap are respectively abutted against the inner wall of the upper pressure ring 9 and the inner wall of the lower pressure ring 13. At least two righting springs 12 are provided inside each righting flap, and one end of each righting spring 12 passes through the righting flap and abuts against the first annular mounting groove.

[0026] As an optional embodiment, the straightening body 14 is provided with a second annular mounting groove near the fork 16, and an anchor shoe positioning block 50 is fixedly provided inside the second annular mounting groove. A hoop spring 15 is sleeved inside the second annular mounting groove, and one end of the hoop spring 15 is fixedly connected to the anchor shoe positioning block 50, and the other end is clamped on the fork 16. A plurality of roller anchor shoes 49 are sleeved on the hoop spring 15.

[0027] As an optional embodiment, a first rubber ring 8 is provided between the valve seat 7 and the ball cover 10 , and the first rubber ring 8 is clamped on the outer wall of the valve seat 7 .

[0028] As an optional embodiment, the decapsulation component includes: An unsealing tube 22 is sleeved on the central tube 18, one end of the unsealing tube 22 is drivingly connected to the seat seal assembly, at least one second rubber ring 19 is provided between the unsealing tube 22 and the central tube 18, and the second rubber ring 19 is clamped on the central tube 18; The shear nail tube 44 is sleeved on a portion of the central tube 18 near the lower joint 47, one end of the shear nail tube 44 is fitted with one end of the unsealing tube 22, and the shear nail tube 44 and the central tube 18 are fixedly connected by at least one unsealing shear nail 42 and at least one soluble shear nail 43.

[0029] As an optional embodiment, the sealing assembly includes: A cone 17, one end of which is sleeved on the fork 16 and fixedly connected, and the other end of which is sleeved on the unsealing tube 22 and fixedly connected; The cava support 21 is sleeved on the central tube 18 , one end of the cava support 21 is drivingly connected to the linkage assembly, and the other end is slidingly connected to a plurality of cava 20 , and each of the cava 20 has a conical surface that fits the cone 17 at one end away from the cava support 21 .

[0030] As an optional embodiment, the linkage component includes: A sealing tube 26 is sleeved on the unsealing tube 22, at least one third rubber ring 23 is provided between the sealing tube 26 and the unsealing tube 22, the third rubber ring 23 is clamped on the unsealing tube 22, one end of the sealing tube 26 is inserted into the cavot 21, and at least one first slide groove is provided on the outer wall of the other end; A short rubber tube 24 is sleeved on the isolation tube 26, and one end of the short rubber tube 24 is fitted with one end of the cavatole 21; The long rubber tube 25 is sleeved on the isolation tube 26. Both ends of the long rubber tube 25 are provided with spacer rings 28. One side of the spacer ring 28 away from the long rubber tube 25 is fitted with the short rubber tube 24. A fourth rubber ring 27 is provided between each of the spacer rings 28 and the isolation tube 26, and each of the fourth rubber rings 27 is clamped on the spacer rings 28. An upper thrust tube 29 is sleeved on the isolation tube 26, and one end of the upper thrust tube 29 is fitted with a spacer ring 28 at one end of the long rubber tube 25 away from the short rubber tube 24; The locking block 30 is arranged between the upper thrust tube 29 and the isolation tube 26, one end of the locking block 30 abuts against the inner wall of the upper thrust tube 29, the locking block 30 and the upper thrust tube 29 are fixedly connected by starting the shear nail 32, and a limit pin 31 is passed through the locking block 30, and the limit pin 31 is arranged inside the first slide groove; A control lock block 33 is inserted into the unsealing tube 22, one end of the control lock block 33 is inserted into the central tube 18, and the other end is pressed against the inner wall of the upper lock block 30; A lead screw tube 35 is sleeved on the unsealing tube 22 and fixedly connected thereto, one end of the lead screw tube 35 passes through the upper thrust tube 29 and abuts against the control lock block 33; A lower thrust tube 34 is sleeved on the screw tube 35, one end of which is disposed inside the upper thrust tube 29, the lower thrust tube 34 is fixedly connected to the upper thrust tube 29, and one end of the lower thrust tube 34 abuts against one end of the upper locking block 30 away from the short rubber tube 24; A nut 36 is sleeved on the screw tube 35, the nut 36 is threadedly connected to the screw tube 35, and one end of the nut 36 is sleeved on the lower thrust tube 34 and fixedly connected; A second retaining ring 39 is sleeved on the unsealing tube 22, one end of the second retaining ring 39 is sleeved on the lead screw tube 35 and fixedly connected, and one end of the second retaining ring 39 abuts against one end of the nut 36; The unblocking block 38 is passed through the unblocking tube 22, one end of the unblocking block 38 is attached to the central tube 18, and the other end is clamped in the second retaining ring 39. The central tube 18 is provided with an annular groove; A reducer 48 is sleeved on the lower joint 47, and the reducer 48 is fixedly connected to the lower joint 47; A key slot body 41, one end of which is sleeved on the second retaining ring 39, and the other end of which is sleeved on the reducer 48. The key slot body 41 is fixedly connected to the reducer 48, and a sliding block 46 is slidably connected on the key slot body 41. The sliding block 46 is fixedly mounted on a portion of the key slot body 41 close to the reducer 48 through a slider shear nail 45; The torque tube 40 is sleeved on the keyway body 41, one end of the torque tube 40 is sleeved on the nut 36 and fixedly connected by at least two pins 37, and a second slide groove is provided on the outer wall of the other end, and the sliding block 46 is arranged in the second slide groove.

[0031] For example, an annular groove is provided on the central tube 18, and the unblocking block 38 falls into the annular groove during the unblocking process to release the unblocking block 38 and reduce the friction resistance of the unblocking block 38; the short rubber tube 24 is located at the lower end of the cava holder 21, so that the short rubber tube 24 and the long rubber tube 25 are squeezed while the cava holder 21 is squeezed, and the cava holder 21 squeezes the cava 20, making the anchoring more stable; the double spacer ring 28 separates the upper thrust tube 29, the long rubber tube 25 and the short rubber tube 24, eliminating the upper thrust The tube 29 directly squeezes the long rubber tube 25, and the friction force is too large, so that the long rubber tube 25 and the short rubber tube 24 rotate together, resulting in wear of the long rubber tube 25 and the short rubber tube 24; the surface of the isolation tube 26 has four liquid holes, through which the pressure during well washing can enter the interior of the short rubber tube 24 and the long rubber tube 25 through the gap between the cavatole 21, causing the short rubber tube 24 and the long rubber tube 25 to expand outward, making it easier for the short rubber tube 24 and the long rubber tube 25 to open, and the short rubber tube 24 and the long rubber tube 25 to be isolated more tightly.

[0032] In the embodiment of the above technical solution, when setting: The oil pipe rotates forward, so that the upper joint 1, the center pipe 18, the lower joint 47, the reducer 48 and the keyway body 41 rotate synchronously, the sliding block 46 transmits torque to rotate the torque tube 40, and the nut 36 and the pin 37 transmit torque to rotate the screw tube 35. The screw tube 35 cannot move up and down due to the control lock block 33, the unlocking block 38 and the second retaining ring 39, and the rotation torque is transmitted to the unlocking tube 22. The unlocking tube 22 transmits the torque to the hoop spring 15, the fork 16 and the cone 17. Due to the fixation of the straightening block 11, the hoop spring 15 is stretched. When the cone 17, the cava 20 and the cava support 21 are opened, the nut 36 will move upward along the axis of the screw tube 35, and at the same time drive the lower thrust tube 34 to rotate upward, pushing the upper locking block 30 and the upper thrust tube 29 to rotate and squeeze the spacer ring 28. The spacer ring 28 squeezes the long rubber tube 25 and the short rubber tube 24. The short rubber tube 24 pushes the cava support 21. The cava support 21 pushes the cava 20 to gradually move along the inclined surface of the cone 17 for anchoring. When the upper locking block 30 moves to a certain extent, the locking block 33 is controlled to fall, providing the previous conditions for the unsealing action.

[0033] When unblocking: Under the premise that the seal has been set, that is, the slips 20 are opened, the short rubber tube 24 and the long rubber tube 25 expand and squeeze the casing, the oil pipe, the upper joint 1, the central pipe 18 and the lower joint 47 are lifted up, and the eight soluble shear nails 43 will be dissolved in the oil well within 48 hours. The four unsealing shear nails 42 drive the shear nail tube 44 to move upward, squeeze the unsealing tube 22, so that the shear nail tube 44 and the central pipe 18 are relatively displaced, the unsealing shear nails 42 are sheared off by the shear force, the central pipe 18 moves upward, and the unblocking block 38 falls off It falls into the annular groove on the center tube 18, and the lower thrust tube 34, the screw tube 35 and the nut 36 lose resistance and slide downward, and the lower thrust tube 34 drives the upper thrust tube 29 to move downward, and the upper thrust tube 29 squeezes the second retaining ring 39, and the control lock block 33 enters the reserved groove of the center tube 18 due to the squeezing, and the limit pin 31 drives the isolation tube 26 to move, and the slip 20, the short rubber tube 24 and the long rubber tube 25 lose support and begin to shrink, shrinking to a size smaller than the maximum outer diameter of the equipment, and the unsealing is completed.

[0034] Well washing path: The well washing fluid is isolated by the short rubber tube 24 and the long rubber tube 25, and can only enter through the liquid inlet hole on the upper joint 1. It is blocked by the valve ball 6 and the valve seat 7 and can only move upward to complete the well washing process.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary well-washing oil layer protection device, comprising an upper joint (1), a ball cover (10), a central tube (18) and a lower joint (47), wherein one end of the upper joint (1) is sleeved on one end of the ball cover (10) and fixedly connected, the other end of the ball cover (10) is sleeved on one end of the central tube (18) and fixedly connected, and the other end of the central tube (18) is inserted into one end of the lower joint (47) and fixedly connected, characterized in that: The upper joint (1) is provided with a plurality of liquid inlet holes on its outer wall near the ball cover (10); the ball cover (10) is provided with a first stop pin (2), a stop ring (5), a valve ball (6) and a valve seat (7); one end of the valve seat (7) abuts against one end of the center tube (18); both ends of the first stop pin (2) are inserted into the inner wall of the ball cover (10); both ends of the stop ring (5) abut against the first stop pin (2) and the valve seat (7) respectively; the valve ball (6) is arranged inside the stop ring (5); and the upper joint (10) is provided with a first stop pin (2), a stop ring (5) and a valve seat (7) respectively; 1) A sand retaining assembly is sleeved on the upper sleeve, a straightening assembly is fixedly arranged at one end of the sand retaining assembly, a shift fork (16) and an unsealing assembly are sleeved on the central tube (18), one end of the shift fork (16) is attached to an end of the straightening assembly away from the sand retaining assembly, a linkage assembly and a seat sealing assembly are sleeved on the unsealing assembly, one end of the seat sealing assembly is fixedly connected to an end of the shift fork (16) away from the straightening assembly, and the other end is transmission-connected to one end of the linkage assembly, and an end of the linkage assembly away from the seat sealing assembly is fixedly connected to the lower joint (47); The sand retaining assembly comprises: A first retaining ring (3) is sleeved on the upper joint (1) and is clamped and connected thereto; A sand-blocking rubber cylinder (4) is sleeved on the upper joint (1) in a bowl shape, one end of the sand-blocking rubber cylinder (4) abuts against the first baffle ring (3), and the other end abuts against the straightening assembly; The righting assembly comprises: A centralizing body (14) is sleeved on the ball cover (10), one end of the centralizing body (14) is fitted with one end of the upper joint (1), and the other end is fitted with the shift fork (16), and a first annular mounting groove is provided on the outer wall of the centralizing body (14); An upper pressure ring (9) is sleeved on the centralizing body (14), one end of the upper pressure ring (9) abuts against the sand-blocking rubber cylinder (4), and the other end extends out of the first annular mounting groove for a certain distance; A lower pressure ring (13) is sleeved on one end of the centralizing body (14) close to the shift fork (16) and is connected by a clamp, and one end of the lower pressure ring (13) extends out of the first annular mounting groove for a certain distance; A plurality of righting flaps are arranged in the first annular mounting groove, and the two ends of each righting flap are respectively abutted against the inner wall of the upper pressure ring (9) and the inner wall of the lower pressure ring (13), and at least two righting springs (12) are arranged inside each righting flap, and one end of each righting spring (12) passes through the righting flap and abuts against the first annular mounting groove.

2. A rotary well-washing oil layer protection device according to claim 1, characterized in that: A second annular mounting groove is provided at a location of the centralizing body (14) near the shift fork (16), an anchor shoe positioning block (50) is fixedly provided inside the second annular mounting groove, a hoop spring (15) is sleeved inside the second annular mounting groove, one end of the hoop spring (15) is fixedly connected to the anchor shoe positioning block (50), and the other end is clamped on the shift fork (16), and a plurality of roller anchor shoes (49) are sleeved on the hoop spring (15).

3. A rotary well-washing oil layer protection device according to claim 1, characterized in that: A first rubber ring (8) is provided between the valve seat (7) and the ball cover (10), and the first rubber ring (8) is clamped on the outer wall of the valve seat (7).

4. A rotary well-washing oil layer protection device according to claim 1, characterized in that: The decapsulation component comprises: an unsealing tube (22) sleeved on the central tube (18), one end of the unsealing tube (22) being drivingly connected to the seat seal assembly, at least one second rubber ring (19) being provided between the unsealing tube (22) and the central tube (18), and the second rubber ring (19) being clamped on the central tube (18); A shear nail tube (44) is sleeved on a portion of the central tube (18) close to the lower joint (47), one end of the shear nail tube (44) is arranged in close contact with one end of the unsealing tube (22), and the shear nail tube (44) and the central tube (18) are fixedly connected via at least one unsealing shear nail (42) and at least one soluble shear nail (43).

5. A rotary well-washing oil layer protection device according to claim 4, characterized in that: The sealing assembly comprises: A cone (17), one end of which is sleeved on and fixedly connected to the shift fork (16), and the other end of which is sleeved on and fixedly connected to the unsealing tube (22); A cava support (21) is sleeved on the central tube (18), one end of the cava support (21) is drivingly connected to the linkage assembly, and the other end is slidably connected to a plurality of cavas (20), and each of the cavas (20) is provided with a conical surface that fits the cone (17) at one end away from the cava support (21).

6. A rotary well-washing oil layer protection device according to claim 5, characterized in that: The linkage components include: A sealing tube (26) is sleeved on the unsealing tube (22), at least one third rubber ring (23) is provided between the sealing tube (26) and the unsealing tube (22), the third rubber ring (23) is clamped on the unsealing tube (22), one end of the sealing tube (26) is inserted into the cava holder (21), and at least one first sliding groove is provided on the outer wall of the other end; A short rubber tube (24) is sleeved on the isolation tube (26), and one end of the short rubber tube (24) is arranged to fit with one end of the cavatole (21); A long rubber tube (25) is sleeved on the isolation tube (26), and both ends of the long rubber tube (25) are provided with spacer rings (28), wherein one side of the spacer ring (28) away from the long rubber tube (25) is fitted with the short rubber tube (24), and a fourth rubber ring (27) is provided between each of the spacer rings (28) and the isolation tube (26), and each of the fourth rubber rings (27) is respectively clamped on the spacer ring (28); An upper thrust tube (29) is sleeved on the isolation tube (26), and one end of the upper thrust tube (29) is arranged in close contact with a spacer ring (28) at one end of the long rubber tube (25) away from the short rubber tube (24); An upper locking block (30) is arranged between the upper thrust tube (29) and the isolation tube (26), one end of the upper locking block (30) abuts against the inner wall of the upper thrust tube (29), the upper locking block (30) and the upper thrust tube (29) are fixedly connected by starting shear nails (32), a limit pin (31) is passed through the upper locking block (30), and the limit pin (31) is arranged inside the first slide groove; A control locking block (33) is inserted into the unsealing tube (22), one end of the control locking block (33) is inserted into the central tube (18), and the other end is pressed against the inner wall of the upper locking block (30); A lead screw tube (35) is sleeved on the unsealing tube (22) and fixedly connected thereto, one end of the lead screw tube (35) passing through the upper thrust tube (29) and abutting against the control lock block (33); A lower thrust tube (34) is sleeved on the screw tube (35), one end of the lower thrust tube (34) is arranged inside the upper thrust tube (29), the lower thrust tube (34) is fixedly connected to the upper thrust tube (29), and one end of the lower thrust tube (34) abuts against an end of the upper locking block (30) away from the short rubber tube (24); a nut (36) sleeved on the screw tube (35), the nut (36) being threadedly connected to the screw tube (35), one end of the nut (36) being sleeved on the lower thrust tube (34) and fixedly connected; A second retaining ring (39) is sleeved on the unsealing tube (22), one end of the second retaining ring (39) is sleeved on the lead screw tube (35) and fixedly connected, and one end of the second retaining ring (39) abuts against one end of the nut (36); an unblocking block (38) which is inserted into the unblocking tube (22), one end of the unblocking block (38) being attached to the central tube (18) and the other end being clamped in the second retaining ring (39), and an annular groove being provided on the central tube (18); A reducer (48) is sleeved on the lower joint (47), and the reducer (48) is fixedly connected to the lower joint (47); a key slot body (41), one end of which is sleeved on the second retaining ring (39) and the other end of which is sleeved on the reducer (48); the key slot body (41) is fixedly connected to the reducer (48); a sliding block (46) is slidably connected to the key slot body (41); the sliding block (46) is fixedly mounted on a portion of the key slot body (41) close to the reducer (48) via a slider shear pin (45); A torque tube (40) is sleeved on the keyway body (41), one end of the torque tube (40) is sleeved on the nut (36) and fixedly connected via at least two pins (37), and a second slide groove is provided on the outer wall of the other end, and the sliding block (46) is arranged in the second slide groove.

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