A protection device and protection method for a continuous cyclic drilling power system

Abstract

The present invention relates to the field of drilling technology, and in particular to a continuous circulation drilling power system protection device and a protection method thereof. The auxiliary positioning mechanism designed in the present invention can accurately measure the displacement of the drill rod when the drill rod moves, which is convenient for positioning, installing and replacing the drill rod. When the drill rod reaches a predetermined position, the gear can be driven to rotate to drive the auxiliary fixing sleeve to fix the drill rod, which is convenient for the installation of the drill rod. The designed hydraulic system is designed with a regulating valve, through which the sealing performance of the two sets of sealing clamping plates can be switched, which is convenient for maintenance and later response to various complex working conditions. The designed hydraulic system cooperates with the sealing mechanism, and compared with the traditional sealing mechanism, it realizes the active sealing of the two sets of elastic sealing rings, and adopts the oil outlet pipe and the oil inlet pipe to transport the hydraulic oil, which greatly improves the sealing performance and safety of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and in particular to a continuous circulation drilling power system protection device and a protection method thereof. Background Art

[0002] Continuous drilling equipment is widely used in the drilling industry because it maintains drilling fluid circulation during drill pipe changes, effectively preventing failures. However, due to the high pressure of drilling fluid, fluid ejection during drill pipe changes and drilling can damage drilling power equipment. Currently, semi-sealed devices that can serve as continuous circulation systems include conventional semi-sealed ram BOPs, conventional passively sealed rotary control heads, and other types of active rotary control heads. Conventional semi-sealed ram rubber cores are directly exposed to friction from the drill pipe, making them susceptible to damage and having a short lifespan. Conventional passively sealed rotary control heads are tall and require a guide cone to guide the core, but this guide cone cannot be used when threading the drill pipe into the continuous circulation system. While many patents have been published, such as those using rubber cores as BOPs, these cores lack active grip on the drill pipe, resulting in poor sealing. Some rubber core BOPs with active grip require complex oil circuits for sealing, which is costly and difficult to ensure. This not only makes continuous drilling equipment more complex and bulky, but also reduces its reliability. Therefore, it is very necessary to design a safe and reliable power protection device for continuous drilling equipment. Summary of the Invention

[0003] In view of the deficiencies mentioned in the above technical background, the object of the present invention is to provide a continuous circulation drilling power system protection device and a protection method thereof.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A continuous circulation drilling power system protection device includes a frame, an auxiliary positioning mechanism, a hydraulic system and a sealing mechanism, and is characterized in that the frame includes a protective shell, the upper and lower surfaces of the protective shell are provided with fixing plates, a first through hole is opened on the fixing plate, two symmetrically distributed bolts are provided on both sides of the first through hole, a positioning sealing ring is provided on the lower surface of the fixing plate, a plurality of circumferentially distributed limiting bosses are provided on the outer side of the positioning sealing ring, a detachable cover plate is provided on the front and rear sides of the protective shell, two parallel distributed fixing sleeves are provided inside the protective shell, the fixing sleeve is fixed to the inner wall of the protective shell, and a sealing sleeve is fixed to the lower surface of the fixing plate below.

[0006] Furthermore, the auxiliary positioning mechanism includes a base arranged on the upper surface of the upper fixed plate, the two bases are symmetrically distributed along the first through hole, a groove is opened in the base, and a slide groove is provided on the upper and lower sides of the groove. A rack is slidingly arranged in the slide groove, and a gear is provided between the two racks. A position sensor is fixed to one end of the upper rack close to the first through hole, and a roller is rotatably connected to the end of the position sensor, and an auxiliary fixing sleeve is fixed to one end of the lower rack close to the first through hole.

[0007] Furthermore, the hydraulic system includes an oil inlet valve body arranged on the right side of the protective shell, an oil inlet is opened on the side of the oil inlet valve body away from the protective shell, a first connecting port is opened at the lower part of the right side of the oil inlet valve body, and a second connecting port is opened at the upper part of the right side of the oil inlet valve body, and an adjusting hole connected to the oil inlet is opened in the middle part of the right side of the oil inlet valve body, a regulating valve is arranged in the regulating hole, and a telescopic pump is arranged outside the regulating hole, the output end of the telescopic pump is fixedly connected to the regulating valve, and the first connecting port and the second connecting port are connected to the oil inlet through the regulating valve.

[0008] Furthermore, the regulating valve has four linearly distributed regulating oil inlets at a position directly opposite the oil inlet, and the regulating valve and the oil inlet are perpendicularly positioned with a first switching port, a second switching port, a third switching port and a fourth switching port from right to left, and each of the four switching ports corresponds to an regulating oil inlet.

[0009] Furthermore, the first switching port is connected through the regulating valve and the first and second connecting ports; the second switching port is connected to the first connecting port; the third switching port is connected to the second connecting port; the fourth switching port is connected through the regulating valve and the first and second connecting ports, and an overflow valve is provided in the fourth switching port.

[0010] Furthermore, the first connecting port and the second connecting port are both connected to an oil inlet pipe, the oil inlet pipe passes through the protective shell, the end of the oil inlet pipe away from the oil inlet valve body is connected to an adjusting block, the adjusting block is tilted, and a downward-tilted plunger head is provided on the outer side of the adjusting block, the side of the adjusting block away from the oil inlet pipe is connected to an oil outlet pipe, the oil outlet pipe passes through the protective shell, the end of the oil outlet pipe away from the adjusting block is connected to the oil outlet valve body, and the oil outlet valve body is connected to the external hydraulic circulation system.

[0011] Furthermore, the sealing mechanism includes a sealing sleeve, and the upper and lower end surfaces of the sealing sleeve are each provided with two symmetrically distributed threaded holes, the threaded holes cooperate with the bolts, the sealing sleeve is provided with an inner cavity, the upper and lower end surfaces of the sealing sleeve are each provided with a sealing groove, the inner wall of the sealing groove is provided with a plurality of circumferentially distributed limiting grooves, the limiting grooves cooperate with the limiting bosses, the inner wall of the inner cavity is provided with two annular grooves, elastic sealing rings are provided on the upper and lower surfaces of the annular grooves, and two symmetrically distributed sealing clamping plates are provided between the elastic sealing rings, the outer diameter of the sealing clamping plate is larger than the inner diameter of the inner cavity, and the outer diameter of the sealing clamping plate is smaller than the inner diameter of the annular groove.

[0012] Furthermore, a semicircular hole is opened on the side of the sealing clamping plate away from the inner cavity, an inclined adjustment sleeve is fixed on the upper surface of the sealing clamping plate, an installation cavity is opened inside the adjustment sleeve, a steel core is arranged inside the installation cavity, and the adjustment sleeve and the sealing sleeve are connected together by sealant.

[0013] Furthermore, the protection method is as follows:

[0014] S1. When replacing the drill rod, the displacement of the drill rod can be accurately measured by the sensor;

[0015] S2: The drill rod reaches the predetermined position, and the gear rotates to drive the auxiliary fixing sleeve to fix the drill rod, facilitating the subsequent installation of the drill rod;

[0016] S3. After the drill pipe is in place, the switching port of the regulating valve is switched according to actual needs to flexibly adjust the clamping force and sealing performance of the two sets of sealing clamping plates;

[0017] S4. When the sealing clamping plate clamps the drill pipe, it always stays in close contact with the elastic sealing ring to ensure sealing;

[0018] S5. When maintenance is required, the cover plate can be removed, and then the position of the regulating valve can be controlled to flexibly detect the sealing of the two sets of sealing clamping plates to improve maintenance efficiency and quality.

[0019] Beneficial effects of the present invention:

[0020] 1. The auxiliary positioning mechanism designed in the present invention can accurately measure the displacement of the drill rod when it moves, which is convenient for positioning, installation and replacement of the drill rod. When the drill rod reaches the predetermined position, the gear can be driven to rotate and drive the auxiliary fixing sleeve to fix the drill rod, which is convenient for installation of the drill rod.

[0021] 2. The hydraulic system designed in the present invention is designed with a regulating valve, through which the sealing of the two sets of sealing clamping plates can be switched, which is convenient for maintenance and later handling of various complex working conditions.

[0022] 3. The hydraulic system and sealing mechanism designed in the present invention cooperate to realize active sealing of two sets of elastic sealing rings compared with traditional sealing mechanisms, and adopt oil outlet pipe and oil inlet pipe to transport hydraulic oil, which greatly improves the sealing performance and safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the protective shell;

[0026] Figure 3 It is a schematic diagram of the external structure of the present invention;

[0027] Figure 4 It is a structural diagram of the fixed plate;

[0028] Figure 5 It is a structural diagram of the auxiliary positioning mechanism;

[0029] Figure 6 It is a partial enlarged schematic diagram of the auxiliary positioning mechanism;

[0030] Figure 7 It is a structural diagram of the hydraulic system;

[0031] Figure 8 It is a partial explosion diagram of the hydraulic system;

[0032] Figure 9 It is the upper view and cross-sectional view of the regulating valve;

[0033] Figure 10 It is a structural diagram of the sealing mechanism;

[0034] Figure 11 is a cross-sectional view of the sealing mechanism;

[0035] Figure 12 It is an exploded view of the clamping parts of the sealing mechanism.

[0036] Description of the numbers in the figure:

[0037] 1. Frame; 11. Protective shell; 12. Cover plate; 13. Fixing plate; 131. First through hole; 132. Bolt; 133. Positioning sealing ring; 1331. Positioning boss; 14. Fixing sleeve; 15. Sealing sleeve; 2. Auxiliary positioning mechanism; 21. Base; 211. Groove; 212. Slide; 22. Rack; 23. Gear; 24. Position sensor; 241. Roller; 25. Auxiliary fixing sleeve; 3. Hydraulic system; 31. Oil inlet valve body; 311. Oil inlet; 312. First connecting port; 313. Adjustment hole; 314. Second connecting port; 32. Telescopic pump; 33. Adjustment Valve; 331, regulating oil inlet; 332, first switching port; 333, second switching port; 334, third switching port; 335, fourth switching port; 336, overflow valve; 34, oil inlet pipe; 35, adjusting block; 351, plunger head; 36, oil outlet pipe; 37, oil outlet valve body; 4, sealing mechanism; 41, sealing sleeve; 411, threaded hole; 412, sealing groove; 4121, limiting groove; 413, inner cavity; 4131, annular groove 4131; 42, adjusting sleeve; 421, mounting cavity; 422, steel core; 43, elastic sealing ring; 44, sealing clamping plate; 441, semicircular hole. DETAILED DESCRIPTION

[0038] 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 any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] A continuous circulation drilling power system protection device and a protection method thereof include a frame 1, an auxiliary positioning mechanism 2, a hydraulic system 3 and a sealing mechanism 4.

[0041] like Figure 1 、 2As shown in Figures 3 and 4, the frame 1 includes a protective shell 11. The upper and lower surfaces of the protective shell 11 are provided with fixing plates 13. The fixing plate 13 has a first through hole 131. Two symmetrically distributed bolts 132 are provided on both sides of the first through hole 131. A positioning sealing ring 133 is provided on the lower surface of the fixing plate 13. A plurality of circumferentially distributed limiting bosses 1331 are provided on the outer side of the positioning sealing ring 133. Removable cover plates 12 are provided on the front and rear sides of the protective shell 11. When maintenance is required, the removable cover plates 12 can be used to inspect the interior of the protective shell 11. Two parallel fixed sleeves 14 are provided inside the protective shell 11. The fixed sleeves 14 are fixed to the inner wall of the protective shell 11. A sealing sleeve 15 is fixed to the lower surface of the lower fixing plate 13.

[0042] As shown in Figures 1, 3, 5, and 6, the auxiliary positioning mechanism 2 includes a base 21 mounted on the upper surface of the upper fixing plate 13. Two bases 21 are symmetrically arranged along the first through-hole 131. A groove 211 is defined within the base 21. Slide grooves 212 are located above and below the groove 211. A rack 22 slides within the slide grooves 212, and a gear 23 is positioned between the two racks 22. A position sensor 24 is secured to the end of the upper rack 22 near the first through-hole 131. A roller 241 is rotatably connected to the end of the position sensor 24. An auxiliary fixing sleeve 25 is secured to the end of the lower rack 22 near the first through-hole 131. When the drill rod is lowered, the gear 23 and rack 22 are driven, causing the roller 241 to contact the drill rod. The rotation of the roller 241 monitors the drill rod's displacement in real time, ensuring that the drill rod reaches the desired position. Once the drill rod reaches the desired position, the gear 23 is driven in reverse, causing the auxiliary fixing sleeve 25 to secure the drill rod, facilitating smooth connection with the underlying components.

[0043] like Figure 1 、 7As shown in Figures 8 and 9, the hydraulic system 3 includes an oil inlet valve body 31 arranged on the right side of the protective shell 11, and an oil inlet port 311 is opened on the side of the oil inlet valve body 31 away from the protective shell 11, a first communication port 312 is opened at the lower part of the right side of the oil inlet valve body 31, and a second communication port 314 is opened at the upper part of the right side of the oil inlet valve body 31, and an adjustment hole 313 connected to the oil inlet port 311 is opened in the middle part of the right side of the oil inlet valve body 31, a regulating valve 33 is arranged in the regulating hole 313, and a telescopic pump 32 is arranged outside the regulating hole 313, the output end of the telescopic pump 32 and the regulating valve 33 are fixedly connected, and the first communication port 312 and the second communication port 314 are connected to the oil inlet port 311 through the regulating valve 33. The regulating valve 33 is provided with four linearly distributed regulating oil inlets 331 at a position facing the oil inlet 311. The regulating valve 33 and the oil inlet 311 are provided with a first switching port 332, a second switching port 333, a third switching port 334 and a fourth switching port 335 from right to left at a position perpendicular to the regulating valve 33. Each of the four switching ports corresponds to one regulating oil inlet 331. The first switching port 332 runs through the regulating valve 33 and is connected to the first connecting port 312 and the second connecting port 314; the second switching port 333 is connected to the first connecting port 312; the third switching port 334 is connected to the second connecting port 312; the fourth switching port 335 runs through the regulating valve 33 and is connected to the first connecting port 312 and the second connecting port 314. An overflow valve 336 is provided in the fourth switching port 335. Different connecting ports can be switched according to actual conditions to increase the diversity of functions and be applicable to a variety of working conditions. When a fault occurs in the device, the location of the fault can be inspected by switching different connecting ports.

[0044] The first connecting port 312 and the second connecting port 314 are both connected to an oil inlet pipe 34, which passes through the protective shell 11. The end of the oil inlet pipe 34 away from the oil inlet valve body 31 is connected to an adjusting block 35, which is tilted. The outer side of the adjusting block 35 is provided with a plunger head 351 tilted downward. The side of the adjusting block 35 away from the oil inlet pipe 34 is connected to an oil outlet pipe 36, which passes through the protective shell 11. The end of the oil outlet pipe 36 away from the adjusting block 35 is connected to an oil outlet valve body 37, and the oil outlet valve body 37 is connected to the external hydraulic circulation system.

[0045] like Figure 1 、 2As shown in Figures 10, 11, and 12, the sealing mechanism 4 includes a sealing sleeve 41. The sealing sleeve has a certain degree of elasticity. Two symmetrically distributed threaded holes 411 are formed on the upper and lower end surfaces of the sealing sleeve 41. The threaded holes 411 cooperate with the bolts 132. The sealing sleeve 41 has an inner cavity 413. The upper and lower end surfaces of the sealing sleeve 41 have sealing grooves 412. The inner wall of the sealing groove 412 has a plurality of circumferentially distributed limiting grooves 4121. The limiting grooves 4121 cooperate with the limiting bosses 1331. Two annular grooves 4131 are formed on the inner wall of the inner cavity 413. Elastic sealing rings 43 are provided on the upper and lower surfaces of the annular grooves 4131. Two symmetrically distributed sealing clamping plates 44 are provided between the elastic sealing rings 43. The outer diameter of the sealing clamping plate 44 is larger than the inner diameter of the inner cavity 413, and the outer diameter of the sealing clamping plate 44 is smaller than the inner diameter of the annular groove 4131. A semicircular hole 441 is formed on the side of the sealing clamping plate 44 facing away from the inner cavity 413. An inclined adjustment sleeve 42 is fixed to the upper surface of the sealing clamping plate 44. Within the adjustment sleeve 42 is a mounting cavity 421, which houses a steel core 422. The adjustment sleeve 42 and the sealing sleeve 41 are connected using sealant. Because the sealing sleeve 41 and the elastic sealing ring 43 have a certain degree of elasticity, applying force to the sealing sleeve 41 causes the sealing clamping plate 44 to move inward and against the drill pipe, achieving a seal. During this movement, a seal is maintained between the clamping plate 44 and the sealing sleeve 41.

[0046] The protection methods are as follows:

[0047] S1. When replacing the drill rod, the displacement of the drill rod can be accurately measured by the sensor 24;

[0048] S2: The drill rod reaches the predetermined position, and the gear 23 rotates to drive the auxiliary fixing sleeve 25 to fix the drill rod, facilitating the subsequent installation of the drill rod;

[0049] S3. After the drill pipe is in place, the switching port of the regulating valve 33 is switched according to actual needs to flexibly adjust the clamping force and sealing performance of the two sets of sealing clamping plates 44;

[0050] S4, when the sealing clamping plate 44 clamps the drill pipe, it always stays in close contact with the elastic sealing ring 43 to ensure sealing;

[0051] S5. When maintenance is required, the cover plate 12 can be removed, and then the position of the regulating valve can be controlled to flexibly detect the sealing performance of the two sets of sealing clamping plates 44, thereby improving maintenance efficiency and quality.

[0052] Here's how it works:

[0053] When the device is working, when installing or replacing a drill rod, the driving gear 23 rotates, and the roller 241 of the position sensor 24 is pressed against the drill rod, rolling along with the drill rod to measure the displacement of the drill rod, so that the drill rod can be accurately installed. When the drill rod reaches the predetermined position, the driving gear 23 is reversed, and the auxiliary fixing sleeve 25 contacts the drill rod, thereby assisting in fixing the drill rod and facilitating the installation of the drill rod.

[0054] During drilling operations, the hydraulic system 3 pumps hydraulic oil into the regulating block 35 through the oil inlet 311, driving the plunger head 351 to extend, squeezing the regulating sleeve 42 and the steel core 422. Since the sealing sleeve 41 has a certain elasticity, the sealing clamping plate 44 can squeeze inward and hold the drill pipe tightly to achieve sealing, preventing the drilling fluid from spraying out and damaging the power system above and below the well.

[0055] When maintenance is required or special circumstances occur and the sealing degree of the two sets of sealing clamping plates 44 needs to be adjusted, the telescopic pump 32 can be driven to drive the regulating valve 33 to slide along the regulating hole 313. At this time, different switching ports can be switched. When the first switching port 332 is connected, the two sets of clamping plates 44 have the same clamping force and sealing; when the second switching port 333 is connected, only the lower clamping plate 44 has a stronger clamping force and sealing; when the third switching port 334 is connected, only the upper clamping plate 44 has a stronger clamping force and sealing; when the fourth switching port 335 is connected, the two sets of clamping plates 44 have different clamping forces and sealing.

[0056] The beneficial effects are as follows:

[0057] The auxiliary positioning mechanism 2 designed in the present invention can accurately measure the displacement of the drill rod when it moves, which is convenient for positioning, installing and replacing the drill rod. When the drill rod reaches the predetermined position, the gear 23 can be driven to rotate and drive the auxiliary fixing sleeve 25 to fix the drill rod, which is convenient for installation of the drill rod.

[0058] The hydraulic system 3 designed in the present invention is designed with a regulating valve 33, through which the sealing performance of the two sets of sealing clamping plates 44 can be switched, which is convenient for maintenance and later handling of various complex working conditions.

[0059] The hydraulic system 3 and sealing mechanism 4 designed in the present invention cooperate to achieve active sealing of two sets of elastic sealing rings 43 compared with traditional sealing mechanisms, and use the oil outlet pipe 26 and the oil inlet pipe 34 to transport hydraulic oil, which greatly improves the sealing and safety of the device.

[0060] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0061] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A continuous circulation drilling power system protection device, comprising a frame (1), an auxiliary positioning mechanism (2), a hydraulic system (3) and a sealing mechanism (4), characterized in that: The frame (1) includes a protective shell (11), wherein the upper and lower surfaces of the protective shell (11) are provided with a fixing plate (13), a first through hole (131) is opened on the fixing plate (13), two symmetrically distributed bolts (132) are provided on both sides of the first through hole (131), a positioning sealing ring (133) is provided on the lower surface of the fixing plate (13), and a plurality of circumferentially distributed limiting bosses (1331) are provided on the outer side of the positioning sealing ring (133), a detachable cover plate (12) is provided on the front and rear sides of the protective shell (11), and two parallel fixed sleeves (14) are provided inside the protective shell (11), the fixed sleeve (14) is fixed to the inner wall of the protective shell (11), and a sealing sleeve (15) is fixed on the lower surface of the fixing plate (13) below; The hydraulic system (3) comprises an oil inlet valve body (31) arranged on the right side of the protective shell (11); an oil inlet (311) is provided on the side of the oil inlet valve body (31) away from the protective shell (11); a first communication port (312) penetrating the oil inlet valve body (31) is provided at the lower part of the right side of the oil inlet valve body (31); a second communication port (314) penetrating the oil inlet valve body (31) is provided at the upper part of the right side of the oil inlet valve body (31); an adjusting hole (313) communicating with the oil inlet (311) is provided at the middle part of the right side of the oil inlet valve body (31); a regulating valve (33) is provided in the regulating hole (313); a telescopic pump (32) is provided outside the regulating hole (313); an output end of the telescopic pump (32) and the regulating valve (33) are fixedly connected; the first communication port (312) and the second communication port (314) are communicated with the oil inlet (311) via the regulating valve (33); The regulating valve (33) is provided with four linearly distributed regulating oil inlets (331) at a position directly opposite to the oil inlet (311); the regulating valve (33) and the oil inlet (311) are provided with a first switching port (332), a second switching port (333), a third switching port (334) and a fourth switching port (335) in sequence from right to left, and each of the four switching ports corresponds to one regulating oil inlet (331); The first switching port (332) passes through the regulating valve (33) and is in communication with the first communication port (312) and the second communication port (314); the second switching port (333) is in communication with the first communication port (312); the third switching port (334) is in communication with the second communication port (312); the fourth switching port (335) passes through the regulating valve (33) and is in communication with the first communication port (312) and the second communication port (314); a relief valve (336) is provided in the fourth switching port (335); The first communication port (312) and the second communication port (314) are both connected to an oil inlet pipe (34), the oil inlet pipe (34) passes through the protective shell (11), one end of the oil inlet pipe (34) away from the oil inlet valve body (31) is connected to an adjusting block (35), the adjusting block (35) is tilted, and a plunger head (351) tilted downward is provided on the outer side of the adjusting block (35), and the side of the adjusting block (35) away from the oil inlet pipe (34) is connected to an oil outlet pipe (36), the oil outlet pipe (36) passes through the protective shell (11), and one end of the oil outlet pipe (36) away from the adjusting block (35) is connected to an oil outlet valve body (37), and the oil outlet valve body (37) is connected to an external hydraulic circulation system; The sealing mechanism (4) comprises a sealing sleeve (41), the upper and lower end surfaces of the sealing sleeve (41) are provided with two symmetrically distributed threaded holes (411), the threaded holes (411) and the bolts (132) cooperate, the sealing sleeve (41) is provided with an inner cavity (413), the upper and lower end surfaces of the sealing sleeve (41) are provided with sealing grooves (412), the inner wall of the sealing groove (412) is provided with a plurality of circumferentially distributed limiting grooves (4121), and the limiting grooves (413) are provided with a plurality of circumferentially distributed limiting grooves (4121). 121) cooperates with the limiting boss (1331), the inner wall of the inner cavity (413) is provided with two annular grooves (4131), the upper and lower surfaces of the annular grooves (4131) are provided with elastic sealing rings (43), and two symmetrically distributed sealing clamping plates (44) are provided between the elastic sealing rings (43), the outer diameter of the sealing clamping plates (44) is larger than the inner diameter of the inner cavity (413), and the outer diameter of the sealing clamping plates (44) is smaller than the inner diameter of the annular grooves (4131); A semicircular hole (441) is formed on one side of the sealing clamping plate (44) away from the inner cavity (413); an adjusting sleeve (42) arranged obliquely is fixed on the upper surface of the sealing clamping plate (44); a mounting cavity (421) is formed inside the adjusting sleeve (42); a steel core (422) is provided inside the mounting cavity (421); and the adjusting sleeve (42) and the sealing sleeve (41) are connected together by using a sealant.

2. A continuous circulation drilling power system protection device according to claim 1, characterized in that: The auxiliary positioning mechanism (2) includes a base (21) arranged on the upper surface of the upper fixed plate (13), the two bases (21) are symmetrically distributed along the first through hole (131), a groove (211) is opened in the base (21), and a slide groove (212) is arranged on the upper and lower sides of the groove (211), a rack (22) is slidably arranged in the slide groove (212), a gear (23) is arranged between the two racks (22), a position sensor (24) is fixed to one end of the upper rack (22) close to the first through hole (131), and a roller (241) is rotatably connected to the end of the position sensor (24), and an auxiliary fixing sleeve (25) is fixed to one end of the lower rack (22) close to the first through hole (131).

3. A protection method for a continuous circulation drilling power system protection device, performed by a continuous circulation drilling power system protection device according to any one of claims 1-2, characterized in that: The protection method is as follows: S1. When replacing the drill rod, the displacement of the drill rod can be accurately measured by the sensor (24); S2, the drill rod reaches the predetermined position, the gear (23) rotates to drive the auxiliary fixing sleeve (25) to fix the drill rod, facilitating the subsequent installation of the drill rod; S3. After the drill pipe is in place, the switching port of the regulating valve (33) is switched according to actual needs to flexibly adjust the clamping force and sealing performance of the two sets of sealing clamping plates (44); S4, when the sealing clamping plate (44) clamps the drill pipe, it always stays in close contact with the elastic sealing ring (43) to ensure sealing performance; S5. When maintenance is required, the cover plate (12) can be disassembled, and then the position of the regulating valve can be controlled to flexibly detect the sealing performance of the two sets of sealing clamping plates (44), thereby improving maintenance efficiency and quality.

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