A safety packer for oil field drilling

Abstract

The present invention relates to the technical field of sealers, and specifically to a safety sealer for oilfield drilling, comprising an equipment main body and a rubber tube arranged on the equipment main body, an expansion plug is arranged on the equipment main body, a plurality of card slots are opened on the equipment main body, a blocking cover is slidably connected to the plurality of card slots, a liquid passage is connected to the equipment main body, a water storage ring is arranged on the equipment main body, and a pluggable liquid filling port is arranged on the water storage ring. Through the arrangement of mechanisms such as a trigger member, when the equipment main body drives the rubber tube to a specified position, the pressure plate will squeeze the rubber tube to cause deformation and expansion, thereby sealing the well. After the rubber tube expands and seals, the trigger member will lock the position of the push rod to prevent the rubber tube from being continuously squeezed and excessively deformed, thereby ensuring the stability of the rubber tube itself.

Description

Technical Field

[0001] The invention relates to the technical field of packers, in particular to a safety packer for oilfield drilling. Background Art

[0002] Packers are commonly used in oil drilling pipelines. Packers refer to downhole tools connected to the downhole tubing and used to isolate the annular space between the oil pipe and the oil and gas well casing or the open hole wall. They are one of the commonly used accessories in the construction and use of oil drilling pipelines.

[0003] When the existing packer is used to seal in the oil pipe, the rubber block has no limiting structure for the deformation pressure, so that the rubber tube will be damaged and deformed when subjected to greater pressure, affecting the sealing effect. At the same time, the existing packer lacks a speed limiting mechanism when it is lowered to the specified position of the oil drilling. When the packer is lowered along with the casing, the lowering speed is usually controlled manually, and errors may occur in the manual control, resulting in the packer being lowered too fast. When the packer is lowered too fast, it may cause the packer to collide with the oil drilling and increase friction, thereby causing damage to the rubber or other parts of the packer. In addition, the existing rubber tube lacks a cleaning mechanism. When the rubber tube is lowered into the drilling well along with the packer, the packer will contact the well wall, and some of the impurities such as soil blocks generated by the contact will fall onto the rubber tube. If these impurities are not cleaned, when the rubber tube expands, the impurities will cause gaps when the rubber tube expands and seals, affecting the sealing effect. Summary of the invention

[0004] The purpose of the present invention is to provide a safety packer for oil field drilling to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a safety packer for oilfield drilling, comprising an equipment body and a rubber tube arranged on the equipment body, an expansion plug is arranged on the equipment body, a plurality of card slots are provided on the equipment body, a blocking cover is slidably connected to the plurality of card slots, a liquid pipe is connected to the equipment body, a water storage ring is arranged on the equipment body, and a pluggable liquid filling port is arranged on the water storage ring;

[0006] The speed limiting mechanism is arranged on the water retaining ring, which can control the speed at which the equipment body descends into the well, and prevent the equipment body from being damaged due to excessive descent speed;

[0007] The cleaning mechanism is arranged on the water trap ring and is linked with the speed limiting mechanism to clean the rubber cylinder;

[0008] The pressing locking mechanism is arranged inside the main body of the device to control the pressing force on the rubber tube to prevent the rubber tube from over-expanding and affecting its own stability;

[0009] The speed limiting mechanism comprises a plurality of speed limiting boxes arranged on the water trap ring, the interiors of the plurality of speed limiting boxes are rotatably connected with a rotating rod, the rotating rod is fixedly connected with a rotating wheel, the rotating wheel is provided with a triggering magnet, a speed limiting ring is provided on the side wall of the rotating wheel, a plurality of guide rails are fixedly connected with the side wall of the rotating wheel, a plurality of magnetic blocks are slidably connected with the inner side walls of the guide rails, a tension spring is fixedly connected with the outer side wall of the magnetic block, and one end of the tension spring away from the magnetic block is fixedly connected to the inner side wall of the guide rail;

[0010] A plurality of limit rods are arranged inside the speed limit box, and a pushing member is slidably connected to the plurality of limit rods together. A pressing spring is arranged at the end of the limit rod, and the other end of the pressing spring contacts the outer wall of the pushing member. A magnetic ring is arranged on the pushing member, and the magnetic pole of the magnetic ring is opposite to the magnetic block. A plurality of friction pressure plates are arranged on the pushing member, and contact alarms are arranged inside the plurality of friction pressure plates. The plurality of friction pressure plates are respectively located on the positive side of the speed limit ring.

[0011] Preferably, the cleaning mechanism includes a spray barrel arranged inside a plurality of speed limit boxes, the inner side wall of the spray barrel being slidably connected with a piston rod, a return spring being sleeved on the piston rod, a contact magnet being arranged at the end of the piston rod, the magnetic pole of the contact magnet being opposite to that of the trigger magnet, a water suction pipe being arranged inside the spray barrel, an end of the water suction pipe being connected to the inside of a water storage ring away from the spray barrel, a water spray pipe being arranged inside the spray barrel, an end of the water spray pipe being connected to a cleaning ring away from the spray barrel, and a plurality of drip holes being provided on the cleaning ring.

[0012] Preferably, the push-locking mechanism includes an inner groove and a bottom groove opened inside the device body, limiting teeth are arranged on both sides of the bottom groove, a blocking plug is slidably connected to the inside of the inner groove, a push rod is arranged on the blocking plug, a pressure spring is sleeved on the push rod, an end of the push rod away from the blocking plug is fixedly connected to an upper plate, a plurality of sliding rods are slidably connected to the upper plate, a movable plate is arranged at the end of the plurality of sliding rods, and an extrusion spring is sleeved on the sliding rod.

[0013] Preferably, a bottom rod is provided at the bottom of the device body, a bottom plate is provided at the bottom of the bottom rod, a lower pressure plate is slidably connected to the bottom rod, a rubber tube is provided between the lower pressure plate and the bottom plate, a plurality of connecting rods are provided on the lower pressure plate, and the plurality of connecting rods all slide through the bottom groove and are connected to the outer wall of the movable plate.

[0014] Preferably, side plates are provided on both sides of the upper plate, the inner walls of the side plates are slidably connected with a slide plate, the slide plate is provided with a side magnet, the side magnet is provided with a return spring, the end of the return spring away from the side magnet is fixedly connected to the outer wall of the side plate, the end of the slide plate away from the side magnet is provided with a sliding cavity, the inner wall of the sliding cavity is slidably connected with a trigger member, the trigger member is provided with an inner spring, and the end of the inner spring away from the trigger member is fixedly connected to the inner wall of the sliding cavity.

[0015] Preferably, two opposite ends of the four sliding rods are provided with limiting magnets, and the magnetic poles of the limiting magnets are the same as those of the side magnets.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Through the setting of trigger parts and other mechanisms, when the equipment body drives the rubber tube to the specified position, the pressure plate will squeeze the rubber tube to cause deformation and expansion, thereby sealing the drilling. After the rubber tube expands and seals, the trigger part will lock the position of the push rod to prevent the rubber tube from being continuously squeezed and excessively deformed, thereby ensuring the stability of the rubber tube itself.

[0018] Through the setting of mechanisms such as the speed limit box, when the equipment body is lowered into the oil well, the rotor will come into contact with the well wall. When the equipment body is lowered too fast, the rotor will adaptively adjust the descent speed of the entire equipment body to avoid damage to the equipment body caused by the equipment body descending too fast. When the equipment body is lowered, the rotor will also drive the spray gun to spray the surface of the rubber tube to avoid impurities on the rubber tube that affect the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0022] Figure 4 for Figure 3 A magnified view of middle;

[0023] Figure 5 The internal structure of the speed limit box of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 6 The internal structure of the speed limit box of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 7 It is a schematic diagram of the internal structure of the present invention;

[0026] Figure 8 for Figure 7 Enlarged view of middle B;

[0027] Fig. 9 It is a schematic diagram of the position structure of the pusher and the pressure plate of the present invention;

[0028] Fig.10 It is a plan view schematic diagram of the present invention;

[0029] Fig.11 It is a schematic diagram of the side plate structure of the present invention;

[0030] Fig.12 is the first state diagram in the present invention;

[0031] Fig.13 This is the second state diagram in the present invention.

[0032] In the attached drawings, the parts represented by the reference numerals are as follows: 1. Equipment body; 2. Liquid pipe; 3. Blocking cover; 4. Card slot; 5. Rubber tube; 6. Speed ​​limit box; 7. Expansion plug; 8. Chassis; 9. Water storage ring; 10. Rotating rod; 11. Rotating wheel; 12. Trigger magnet; 13. Spray pipe; 14. Cleaning ring; 15. Drip hole; 16. Spray gun; 17. Water pumping pipe; 18. Piston rod; 19. Return spring; 20. Contact magnet; 21. Speed ​​limit ring; 22. Guide rail; 23. Magnetic block; 24. Tension spring; 25. Pushing member; 26. Magnetic ring; 27. Limiting rod; 28. Pressing spring; 29. ​​Friction pressure plate; 30. Inner groove; 31. Blocking plug; 32. Pressure spring; 33. Push rod; 34. Bottom rod; 35. Side magnet; 36. Lower pressure plate; 37. Connecting rod; 38. Upper plate; 39. Moving plate; 40. Sliding rod; 41. Extrusion spring; 42. Limiting magnet; 43. Limiting tooth; 44. Slide plate; 45. Trigger member; 46. Return spring; 47. Side plate; 48. Inner spring; 49. Bottom groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figure 1 - Fig.11In the figure, a safety packer for oilfield drilling includes an equipment body 1 and a rubber tube 5 arranged on the equipment body 1, an expansion plug 7 is arranged on the equipment body 1, a plurality of card slots 4 are opened on the equipment body 1, and a blocking cover 3 is slidably connected to the plurality of card slots 4, a liquid pipe 2 is connected to the equipment body 1, a water storage ring 9 is arranged on the equipment body 1, and a pluggable liquid filling port is arranged on the water storage ring 9, and a speed limiting mechanism is arranged on the water storage ring 9, which can control the speed of the equipment body 1 going down into the well to prevent the equipment body 1 from being damaged by the excessive descent speed of the equipment body 1, and the speed limiting mechanism includes a plurality of speed limiting boxes 6 arranged on the water storage ring 9, and the interiors of the plurality of speed limiting boxes 6 are all rotatably connected to a rotating rod 10, and a rotating wheel 11 is fixedly connected to the rotating rod 10, and a trigger magnet 12 is arranged on the rotating wheel 11, and the rotating wheel 11 has a plurality of speed limiting boxes 6 arranged on the water storage ring 9. A speed limiting ring 21 is provided on the side wall of the rotating wheel 11, and a plurality of guide rails 22 are fixedly connected to the side wall of the rotating wheel 11, and a plurality of magnetic blocks 23 are slidably connected to the inner side walls of the plurality of guide rails 22, and a tension spring 24 is fixedly connected to the outer side wall of the magnetic block 23, and one end of the tension spring 24 away from the magnetic block 23 is fixedly connected to the inner side wall of the guide rail 22. A plurality of limit rods 27 are provided inside the speed limiting box 6, and a pushing member 25 is slidably connected to the plurality of limit rods 27 together with a pushing member 25, and a pressing spring 28 is provided at the end of the limit rod 27, and the other end of the pressing spring 28 contacts the outer wall of the pushing member 25, and a magnetic ring 26 is provided on the pushing member 25, and the magnetic pole of the magnetic ring 26 is opposite to that of the magnetic block 23, and a plurality of friction pressure plates 29 are provided on the pushing member 25, and contact alarms are provided inside the plurality of friction pressure plates 29, and the plurality of friction pressure plates 29 are respectively located on the positive side of the speed limiting ring 21.

[0035] A cleaning mechanism is arranged on the water storage ring 9 and is linked with the speed limiting mechanism to clean the rubber tube 5. The cleaning mechanism includes a spray barrel 16 arranged inside a plurality of speed limiting boxes 6. A piston rod 18 is slidably connected to the inner wall of the spray barrel 16. A return spring 19 is sleeved on the piston rod 18. A contact magnet 20 is arranged at the end of the piston rod 18. The magnetic pole of the contact magnet 20 is opposite to that of the trigger magnet 12. A water extraction pipe 17 is arranged inside the spray barrel 16. One end of the water extraction pipe 17 away from the spray barrel 16 is connected to the inside of the water storage ring 9. A water spray pipe 13 is arranged inside the spray barrel 16. One end of the water spray pipe 13 away from the spray barrel 16 is connected to a cleaning ring 14. A plurality of drip holes 15 are provided on the cleaning ring 14.

[0036] In this embodiment, when in use, when the device body 1 is lowered into the oil well, the wheels 11 located on the multiple speed limit boxes 6 will contact the well wall, and rub against the well wall and roll during the lowering process of the device body 1. During the lowering process, if the operator makes a mistake and causes the device body 1 to be lowered too fast, the rotation speed of the wheel 11 will increase. When the rotation speed of the wheel 11 is too fast, the centrifugal force generated will cause the magnetic block 23 to overcome the tension of the tension spring 24 and be thrown to the outside of the guide rail 22. The magnetic block 23 located on the outside of the guide rail 22 is just located on the positive side of the magnetic ring 26. At this time, the distance between the magnetic block 23 and the magnetic ring 26 becomes closer. Under the action of the magnetic force of attraction, the pusher 25 will overcome the pressing force. The elastic force of the spring 28 moves in the direction close to the rotating wheel 11. When the pushing member 25 moves in the direction close to the rotating wheel 11, the multiple friction pressure plates 29 located on the pushing member 25 will contact the speed limiting ring 21. Since both are made of frosted material, when the two are in contact, friction will be generated to reduce the rotation speed of the rotating wheel 11. When the rotation speeds of the multiple rotating wheels 11 are reduced, the friction between the multiple rotating wheels 11 and the well wall will increase, thereby reducing the descent speed of the equipment body 1. A contact alarm is provided in the friction pressure plate 29. When the friction pressure plate 29 contacts the speed limiting ring 21, a remote alarm will be issued to remind the operator to pay attention to the descent speed (the contact alarm is a prior art and will not be elaborated on in detail).

[0037] Example 2: Please refer to Figure 1 - Fig.13 This embodiment further explains the first embodiment. The pressing locking mechanism shown in the figure is arranged inside the device body 1 to control the pressing force on the rubber tube 5 to prevent the rubber tube 5 from over-expanding and affecting its own stability. The pressing locking mechanism includes an inner groove 30 and a bottom groove 49 (such as Figure 7 As shown in the figure, the two sides of the bottom groove 49 are provided with limited teeth 43, the inner groove 30 is slidably connected with a blocking plug 31, the blocking plug 31 is provided with a push rod 33, the push rod 33 is sleeved with a pressure spring 32, the end of the push rod 33 away from the blocking plug 31 is fixedly connected with an upper plate 38, the upper plate 38 is slidably connected with a plurality of slide rods 40, the ends of the plurality of slide rods 40 are provided with a moving plate 39, the slide rods 40 are sleeved with a compression spring 41, and the bottom of the device body 1 is provided with There is a bottom rod 34, a chassis 8 is provided at the bottom of the bottom rod 34, a lower pressure plate 36 is slidably connected to the bottom rod 34, a rubber tube 5 is provided between the lower pressure plate 36 and the chassis 8, a plurality of connecting rods 37 are provided on the lower pressure plate 36, and the plurality of connecting rods 37 are all slidably penetrated into the bottom groove 49 and connected to the outer wall of the movable plate 39, side plates 47 are provided on both sides of the upper plate 38, and the inner side wall of the side plate 47 is slidably connected to the slide plate 44, and the slide plate 44 is provided with a side magnet 35 (such as Fig.11As shown in the figure, a return spring 46 is arranged on the side magnet 35, and one end of the return spring 46 away from the side magnet 35 is fixedly connected to the outer wall of the side plate 47, and a sliding cavity is provided at one end of the slide plate 44 away from the side magnet 35, and a trigger member 45 is slidably connected to the inner wall of the sliding cavity, and an inner spring 48 is arranged on the trigger member 45, and one end of the inner spring 48 away from the trigger member 45 is fixedly connected to the inner wall of the sliding cavity, and two opposite ends of the four slide rods 40 are provided with limit magnets 42 (refer to Fig.12 ), the magnetic poles of the limiting magnet 42 are the same as those of the side magnet 35.

[0038] In this embodiment, while the rotating wheel 11 rotates, it will also drive the trigger magnet 12 to rotate synchronously. When the trigger magnet 12 intermittently rotates to the positive side of the contact magnet 20, under the action of the intermittent magnetic force and the elastic force of the return spring 19, the piston rod 18 will perform a reciprocating suction motion in the nozzle 16. When the piston rod 18 performs a reciprocating suction motion in the nozzle 16, the nozzle 16 will suck the water in the water storage ring 9 into the interior through the suction pipe 17, and then spray it into the cleaning ring 14 through the water spray pipe 13. Finally, the surface of the rubber tube 5 is sprayed and cleaned through a plurality of drip holes 15 to prevent the rubber tube 5 from being contaminated with impurities and affecting the expansion and sealing effect of the rubber tube 5.

[0039] When the device body 1 reaches the designated position, pressure liquid can be injected into the inner tank 30 through the existing external pipe connected to the liquid pipe 2. Under the push of the pressure liquid, the blocking plug 31 will push the push rod 33 to move downward (refer to Figure 7 ), when the push rod 33 moves downward, it will push the upper plate 38 to move downward synchronously. When the upper plate 38 moves downward synchronously, the upper plate 38 will drive the movable plate 39 to move downward synchronously through the extrusion spring 41, and push the lower pressure plate 36 to squeeze the rubber tube 5 through the connecting rod 37 connected thereto, so that the rubber tube 5 will deform and expand (this is the prior art and will not be elaborated on in detail). When the rubber tube 5 expands and deforms, the drilling will be sealed.

[0040] When the rubber tube 5 is expanding and deforming, since the rubber tube 5 is not in contact with the well wall at this time, the force of the lower pressure plate 36 pressing down on the rubber tube 5 to make it expand is relatively small. Therefore, when the upper plate 38 presses the connecting rod 37 through the moving plate 39 connected by the extrusion spring 41, the connecting rod 37 can push the lower pressure plate 36 to move down normally and squeeze the rubber tube 5 to make the rubber tube 5 expand. When the rubber tube 5 expands and contacts the well wall for isolation, under the influence of the reaction force of the well wall, the force of the lower pressure plate 36 pressing down on the rubber tube 5 to make it continue to expand will increase Under the influence of the large driving force required by the rubber tube 5, the movable plate 39 connected to the upper plate 38 cannot push the connecting rod 37 downward by the elastic force of the squeezing spring 41. At this time, when the upper plate 38 continues to squeeze the movable plate 39 to press the connecting rod 37 downward, the movable plate 39 is relatively immobile under the obstruction of the connecting rod 37, and the upper plate 38 will be closer and closer to the movable plate 39. When the distance between the upper plate 38 and the movable plate 39 becomes closer, the sliding rod 40 will push the limiting magnet 42 to the positive side of the side magnet 35 (refer to Fig.12 ), when the limiting magnet 42 comes to the positive side of the side magnet 35, under the action of the repulsive magnetic force, the slide plate 44 will overcome the elastic force of the return spring 46 and move toward the limiting tooth 43, so that the trigger member 45 contacts and inserts into the limiting tooth 43 (refer to Fig.13 ), when the trigger member 45 is inserted into the limiting tooth 43, the flat angle edge of the trigger member 45 will contact the limiting tooth 43, blocking the upper plate 38 from continuing to move downward, thereby limiting the position of the upper plate 38, preventing the upper plate 38 from continuing to squeeze the rubber tube 5 through the moving plate 39 and other mechanisms to cause excessive deformation, thereby ensuring the use effect of the rubber tube 5.

[0041] When the sealing is completed and the equipment body 1 needs to be recovered, the pressure liquid can be stopped from being introduced into the inner groove 30. At this time, the push rod 33 without the driving force will move upward and return to its original position under the elastic force of the pressure spring 32. When the push rod 33 returns to its original position, it will continue to pull the upper plate 38 and the movable plate 39 upward. When the upper plate 38 and the movable plate 39 move upward, they will drive the trigger member 45 to move upward synchronously. When the trigger member 45 moves upward, the limiting tooth 43 will contact the beveled edge of the trigger member 45 and squeeze the trigger member 45 into the slide plate 44 along the beveled edge of the trigger member 45 until it is out of contact with the limiting tooth 43. In summary, the trigger member 45 only limits the downward movement of the upper plate 38, and does not move the upper plate 38 upward. When the push rod 33 moves upward, the rubber tube 5 will no longer be squeezed, and the movable plate 39 will move away from the upper plate 38 under the elastic force of the squeezing spring 41, so that the positions of the two return to their original state. When the movable plate 39 moves away from the upper plate 38, it will also drive the sliding bar 40 back to its original position. When the sliding bar 40 returns to its original position, the limiting magnet 42 will move away from the side magnet 35, and the sliding plate 44 that loses its magnetic force will return to its original position under the elastic force of the return spring 46, so that the trigger member 45 will be out of contact with the limiting tooth 43, thereby releasing the downward movement limit of the upper plate 38, which is convenient for next use.

[0042] It should be noted that if an oil well with low mineralization is encountered, the operator can pull down the blocking cover 3 to allow the expansion plug 7 to leak out. When the leaked expansion plug 7 is lowered into the well along with the equipment body 1, it encounters water or oil and absorbs moisture to expand and seal the well (this is the prior art and will not be elaborated on). If an oil well with a higher mineralization is encountered, a rubber tube 5 can be used for sealing. The reason why the expansion plug 7 is not suitable for use in a well with a higher mineralization is that when the mineralization in water or oil is high, the water ion concentration increases, and the water ions with high mineralization will compete with the water-absorbing particles for water, thereby reducing the expansion efficiency of the water-absorbing particles in the expansion plug 7, and then slowing down the expansion speed of the expansion plug 7.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety packer for oilfield drilling, comprising a device body (1) and a rubber tube (5) arranged on the device body (1), characterized in that: The device body (1) is provided with an expansion plug (7), the device body (1) is provided with a plurality of slots (4), a blocking cover (3) is slidably connected to the plurality of slots (4), a liquid passage (2) is provided in communication with the device body (1), a water storage ring (9) is provided on the device body (1), and a pluggable liquid filling port is provided on the water storage ring (9); A speed limiting mechanism is arranged on the water trap ring (9) and can control the speed at which the device body (1) descends into the wellbore, thereby preventing the device body (1) from being damaged due to the device body (1) descending too fast; A cleaning mechanism is arranged on the water trap ring (9) and is linked with the speed limiting mechanism to clean the rubber cylinder (5); A pressing locking mechanism is arranged inside the device body (1) to control the pressing force on the rubber tube (5) to prevent the rubber tube (5) from over-expanding and affecting its own stability; The speed limiting mechanism comprises a plurality of speed limiting boxes (6) arranged on a water trap ring (9), the interiors of the plurality of speed limiting boxes (6) are all rotatably connected to a rotating rod (10), the rotating rod (10) is fixedly connected to a rotating wheel (11), the rotating wheel (11) is provided with a triggering magnet (12), a speed limiting ring (21) is provided on the side wall of the rotating wheel (11), a plurality of guide rails (22) are fixedly connected to the side wall of the rotating wheel (11), a plurality of magnetic blocks (23) are slidably connected to the inner side walls of the plurality of guide rails (22), a tension spring (24) is fixedly connected to the outer side wall of the magnetic block (23), and one end of the tension spring (24) away from the magnetic block (23) is fixedly connected to the inner side wall of the guide rail (22); A plurality of limit rods (27) are arranged inside the speed limit box (6), and a pusher (25) is slidably connected to the plurality of limit rods (27). A pressing spring (28) is arranged at the end of the limit rod (27), and the other end of the pressing spring (28) contacts the outer wall of the pusher (25). A magnetic ring (26) is arranged on the pusher (25), and the magnetic pole of the magnetic ring (26) is opposite to that of the magnetic block (23). A plurality of friction pressure plates (29) are arranged on the pusher (25), and contact alarms are arranged inside the plurality of friction pressure plates (29). The plurality of friction pressure plates (29) are respectively located on the positive side of the speed limit ring (21).

2. The safety packer for oilfield drilling according to claim 1, characterized in that: The cleaning mechanism comprises a spray barrel (16) arranged inside a plurality of speed limit boxes (6); a piston rod (18) is slidably connected to the inner side wall of the spray barrel (16); a return spring (19) is sleeved on the piston rod (18); a contact magnet (20) is arranged at the end of the piston rod (18); the magnetic pole of the contact magnet (20) is opposite to that of the trigger magnet (12); a water extraction pipe (17) is arranged inside the spray barrel (16); one end of the water extraction pipe (17) away from the spray barrel (16) is connected to the inside of a water storage ring (9); a water spray pipe (13) is arranged inside the spray barrel (16); one end of the water spray pipe (13) away from the spray barrel (16) is connected to a cleaning ring (14); and a plurality of drip holes (15) are provided on the cleaning ring (14).

3. The safety packer for oilfield drilling according to claim 1, characterized in that: The push-lock mechanism comprises an inner groove (30) and a bottom groove (49) which are provided inside the device body (1), and limit teeth (43) are provided on both sides of the bottom groove (49). A blocking plug (31) is slidably connected inside the inner groove (30), and a push rod (33) is provided on the blocking plug (31). A pressure spring (32) is sleeved on the push rod (33). An end of the push rod (33) away from the blocking plug (31) is fixedly connected to an upper plate (38), and a plurality of slide rods (40) are slidably connected to the upper plate (38). The ends of the plurality of slide rods (40) are fixedly connected to a movable plate (39), and a compression spring (41) is sleeved on the slide rod (40).

4. The safety packer for oilfield drilling according to claim 3, characterized in that: A bottom rod (34) is provided at the bottom of the device body (1), a bottom plate (8) is provided at the bottom of the bottom rod (34), a lower pressure plate (36) is slidably connected to the bottom rod (34), a rubber tube (5) is provided between the lower pressure plate (36) and the bottom plate (8), a plurality of connecting rods (37) are provided on the lower pressure plate (36), and the plurality of connecting rods (37) are all slidably penetrated into the bottom groove (49) and connected to the outer wall of the movable plate (39).

5. The safety packer for oilfield drilling according to claim 3, characterized in that: Side plates (47) are provided on both sides of the upper disk (38); a slide plate (44) is slidably connected to the inner wall of the side plate (47); a side magnet (35) is provided on the slide plate (44); a return spring (46) is provided on the side magnet (35); an end of the return spring (46) away from the side magnet (35) is fixedly connected to the outer wall of the side plate (47); a sliding cavity is provided at an end of the slide plate (44) away from the side magnet (35); a trigger member (45) is slidably connected to the inner wall of the sliding cavity; an inner spring (48) is provided on the trigger member (45); an end of the inner spring (48) away from the trigger member (45) is fixedly connected to the inner wall of the sliding cavity.

6. The safety packer for oilfield drilling according to claim 3, characterized in that: Two opposite ends of the four sliding rods (40) are provided with limiting magnets (42), and the magnetic poles of the limiting magnets (42) are the same as those of the side magnets (35).

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