High temperature resistant multiphase flow screw drill

Abstract

The application discloses a high-temperature-resistant multiphase flow screw drill, which is applied to the technical field of multiphase flow screw drills. The centering mechanism is sleeved on the surface of the motor assembly, oil liquid is injected into the centering mechanism through external equipment during the tripping of the screw drill, the connecting ring is moved and the flexible metal sheet is bent and expanded under the action of pressure, different shapes of well walls can be adapted, the centering property of the screw drill can be kept all the time, the sticking phenomenon is reduced, and when the well wall is locally protruding or recessed, the opening degree of one or more flexible metal sheets can be adjusted according to the actual contact condition through the limiting piece, the expansion degree of the flexible metal sheet is finely adjusted, the good contact with the well wall is kept all the time, and the centering property of the screw drill is ensured.

Description

Technical Field

[0001] This invention belongs to the field of multiphase flow screw drill technology, and specifically relates to a high-temperature resistant multiphase flow screw drill. Background Technology

[0002] Multiphase flow screw drill is a type of volumetric downhole power drill that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. When the mud pumped out by the mud pump flows through the bypass valve into the motor, a certain pressure difference is formed between the inlet and outlet of the motor, which drives the rotor to rotate around the axis of the stator and transmits the speed and torque to the drill bit through the universal joint and the drive shaft, thereby realizing drilling operations.

[0003] Screw drills have a relatively complex structure. During the tripping process, especially in wells with small boreholes or complex well structures, irregularities in the well wall can easily cause friction between the screw drill and the well wall, leading to problems such as stuck drill bits and affecting the use of the screw drill.

[0004] Based on the above-mentioned issues, it can be found that existing devices on the market are difficult to avoid the problems mentioned above when in use, thus failing to achieve the desired effect. Therefore, we propose a high-temperature resistant multiphase flow screw drill that can maintain the alignment of the screw drill in the well and reduce the occurrence of screw drill sticking. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing high-temperature multiphase flow screw drills. Its advantages include a centering mechanism, which, when mounted on the surface of the motor assembly, allows oil to be injected into the centering mechanism via external equipment during the drilling process. This pressure causes the connecting ring to move and the flexible metal sheet to bend and expand, adapting to different wellbore shapes. This ensures consistent centering of the screw drill, reduces stuck pipe, and allows for adjustment of the opening degree of one or more flexible metal sheets by limiting components when encountering local protrusions or depressions in the wellbore. This fine-tuning of the expansion degree of the flexible metal sheets maintains good contact with the wellbore and ensures consistent centering of the screw drill.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a high-temperature resistant multiphase flow screw drill, comprising a screw drill, wherein the screw drill comprises a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal joint assembly, a drive shaft assembly and a drill bit assembly, wherein the bypass valve assembly, the anti-drop assembly, the motor assembly, the universal joint assembly, the drive shaft assembly and the drill bit assembly are connected sequentially from back to front, and a centering mechanism is sleeved on the front side of the surface of the motor assembly; The centering mechanism includes two retaining rings, which are sleeved on the front side of the motor assembly surface. A connecting ring and a fixing ring are provided between the opposite sides of the two retaining rings. A flexible metal sheet is welded in an annular shape between the surfaces of the connecting ring and the fixing ring. A limiting member is annularly bolted between the opposite sides of the connecting ring and the fixing ring, and the limiting member is connected to the side of the flexible metal sheet.

[0007] By adopting the above technical solution, and by setting up a centering mechanism, which is mounted on the surface of the motor assembly, oil can be injected into the centering mechanism through external equipment during the tripping of the screw drill bit. Under pressure, the connecting ring moves and the flexible metal sheet bends and expands, thus adapting to well walls of different shapes. Therefore, the centering of the screw drill bit can always be maintained, reducing stuck drill bit phenomena. Furthermore, when encountering local protrusions or depressions in the well wall, the opening degree of one or more flexible metal sheets can be adjusted according to the actual contact situation through the limiting component, thereby achieving the effect of fine adjustment of the expansion degree of the flexible metal sheet, thus maintaining good contact with the well wall and ensuring the centering of the screw drill bit.

[0008] The invention is further configured such that: the retaining ring includes two fixed half-rings, which are rotatably connected to each other; the two fixed half-rings are respectively sleeved on the top and bottom of the motor assembly surface; the rear side of the rear fixed half-ring is connected to an injection tube; a squeezing plate is slidably arranged inside the fixed half-ring; and two moving posts are arranged inside the squeezing plate; the side of the moving post near the connecting ring and the fixed ring extends to the outside of the fixed half-ring and is respectively connected to the connecting ring and the fixed ring; a first return spring is sleeved on the surface of the moving post; and the side of the first return spring near the squeezing plate and the inner wall of the fixed half-ring is respectively connected to both.

[0009] By adopting the above technical solution, a retaining ring is set, which allows for the rotational connection between the two fixed half-rings, facilitating the installation of the centering mechanism onto the motor assembly. This also helps to limit the position of the connecting ring and the fixed ring. Furthermore, by connecting to external equipment via an injection pipe, oil can be injected into the cavity formed between the fixed half-ring and the extrusion plate. Under pressure, this pushes the extrusion plate and the moving column, causing the first return spring to contract and push the connecting ring to move. This causes the flexible metal sheet to bend and expand, adapting to different wellbore shapes. Therefore, the centering of the screw drill string is always maintained, reducing the risk of stuck drill bit.

[0010] The present invention is further configured such that: the front end of the injection tube passes through the interior of the motor assembly, the anti-drop assembly and the bypass valve assembly in sequence and extends to the exterior of the bypass valve assembly, and is connected to external equipment; the two fixed half-rings are connected by a fastening structure.

[0011] By adopting the above technical solution, the injection pipe passes through the motor assembly, the anti-drop assembly and the bypass valve assembly in sequence and extends to the outside of the bypass valve assembly. This can achieve the effect of protecting the injection pipe without affecting the normal use of the screw drill.

[0012] The invention is further configured such that: the interior of the front movable column is hollow and communicates with the extrusion plate; the interior of the front movable column is threaded with a hollow screw, and the hollow screw is in close contact with the side of the connecting ring.

[0013] By adopting the above technical solution, the front moving column is hollow, and the front moving column is connected to the connecting ring by the hollow screw. This allows some of the injected oil to enter the interior of the connecting ring through the moving column and the hollow screw, thereby achieving the effect of using some oil to push the limiting component to make local adjustments to the flexible metal sheet.

[0014] The invention is further configured such that: the limiting member includes two support plates, the side of the support plate near the connecting ring and the fixing ring are respectively bolted to the two rings, the front side of the rear support plate is provided with a guide plate, and the front side of the guide plate is bolted to the front support plate, the front and rear sides of the support plate opposite to the flexible metal sheet are provided with connecting rods, and the two ends of the connecting rod surface are rotatably connected with connecting frames, one side of the connecting frame is bolted to the flexible metal sheet, and the other side of the connecting frame is bolted to the support plate, the sliding block is slidably disposed inside the support plate, the opposite sides of the front and rear sliding blocks are provided with limiting springs, and the side of the limiting spring near the inner wall of the support plate is connected to the limiting spring, and an adjusting cylinder is bolted between the guide plate and the opposite side of the flexible metal sheet, and the adjusting cylinder is used in conjunction with the connecting ring.

[0015] By adopting the above technical solution, and by setting a limiting component, when the connecting ring pushes the flexible metal sheet to bend and expand, it will simultaneously drive the front support plate to slide on the guide plate. Under the elastic action of the limiting spring, the sliding block and the connecting frame can be pushed to move, thereby allowing the connecting rod to support the flexible metal sheet, which can improve the stability of the flexible metal sheet. Furthermore, when encountering local protrusions or depressions in the well wall, the oil in the connecting ring enters the adjusting cylinder corresponding to the position of the flexible metal sheet that needs to be adjusted, and pushes the push plate to move inside the cylinder. This allows the push rod to extend or retract, adjusting the opening degree of one or more flexible metal sheets, thereby achieving the effect of fine-tuning the expansion degree of the flexible metal sheet, and thus always maintaining good contact with the well wall.

[0016] The invention is further configured such that: the adjusting cylinder includes a cylinder body, the cylinder body is bolted to the side of the guide plate near the flexible metal sheet, the side of the cylinder body near the guide plate is connected to a connecting pipe, and the rear end of the connecting pipe passes through the interior of the guide plate and the rear support plate in sequence and is connected to a connecting ring, a push plate is slidably connected inside the cylinder body, and a push rod is bolted to the side of the push plate away from the inner wall of the cylinder body, the side of the push rod away from the push plate extends to the outer side of the cylinder body and is connected to the flexible metal sheet, a second return spring is sleeved on the surface of the push rod, and the side of the second return spring near the push plate and the inner wall of the cylinder body are respectively connected to both.

[0017] By adopting the above technical solution, by setting an adjusting cylinder, the oil in the connecting ring can enter the interior of the cylinder through the connecting pipe. Under the action of pressure, the push plate can be moved and squeezed to compress the second return spring. The movement of the push plate can drive the push rod to extend or retract, which can adjust the opening degree of one or more flexible metal sheets, thereby achieving the effect of fine adjustment of the expansion degree of the flexible metal sheets, thus always maintaining good contact with the well wall and ensuring the centering of the screw drill bit.

[0018] The present invention is further configured such that: the connecting ring includes a housing, the interior of which is provided with a liquid storage tank, and the front side of the interior of the housing is provided with a plurality of communicating grooves in an annular shape, a fixed seat is provided inside the communicating groove, and a valve core is tightly fitted inside the fixed seat, a moving iron core is welded to one side of the valve core, a third return spring is connected to one side of the moving iron core, and a fixed iron core is provided on the side of the third return spring away from the moving iron core, one side of the fixed iron core is connected to the inner wall of the housing, and a coil is provided inside the housing, and the coil is sleeved between the surfaces of the moving iron core and the fixed iron core.

[0019] By adopting the above technical solution, the oil entering the well can be stored in the storage tank by setting a connecting ring. When encountering a local protrusion or depression in the well wall, a magnetic field can be generated by energizing the coil, causing the moving iron core and the fixed iron core to generate magnetic force. This causes the moving iron core to drive the valve core towards the fixed iron core and squeeze the third return spring, which can release the valve core from the blockage of the fixed seat, realize the connection of the flow channel, and allow the oil in the storage tank to enter the cylinder through the connecting pipe. When the flexible metal sheet does not need to be adjusted, the coil is de-energized and loses the magnetic field. The elasticity of the third return spring is used to push the moving iron core to contact the fixed seat, thus realizing the blockage of the flow channel.

[0020] The present invention is further configured such that: the rear side of the connecting groove is connected to the liquid storage tank, and the hollow screw is located inside the liquid storage tank and is connected to it.

[0021] By adopting the above technical solution, the flow of oil can be achieved by setting the rear side of the connecting groove to the liquid storage tank and setting the hollow screw to connect with the liquid storage tank.

[0022] The present invention is further configured such that both the screw drill and the centering mechanism are made of high-temperature resistant materials.

[0023] By adopting the above technical solution, and by setting both the screw drill bit and the centering mechanism to be made of high-temperature resistant materials, the screw drill bit and the centering mechanism can adapt to the high-temperature environment inside the well, thus ensuring their service life.

[0024] The present invention is further configured such that: a groove is provided on the front side of the surface of the motor assembly, and the centering mechanism is located on the surface of the groove.

[0025] By adopting the above technical solution, a groove is provided on the front side of the motor assembly surface, which facilitates the placement of the centering mechanism on the motor assembly.

[0026] In summary, the present invention has the following beneficial effects: By setting up a centering mechanism, which is mounted on the surface of the motor assembly, oil can be injected into the centering mechanism through external equipment during the tripping of the screw drill bit. Under pressure, the connecting ring can move and the flexible metal sheet can bend and expand, thus adapting to well walls of different shapes. Therefore, the centering of the screw drill bit can always be maintained, reducing the phenomenon of stuck drill bit. By using a combination of limiting components and connecting rings, when encountering local protrusions or depressions in the well wall, the limiting components can adjust the opening degree of one or more flexible metal sheets according to the actual contact situation, thereby achieving the effect of fine-tuning the expansion degree of the flexible metal sheets, and thus always maintaining good contact with the well wall, ensuring the centering of the screw drill bit. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the centering mechanism structure of the present invention; Figure 3 This is a cross-sectional schematic diagram of the retaining ring of the present invention; Figure 4 This is a schematic diagram showing the connection of the fixing ring, connecting ring, flexible metal sheet and limiting member of the present invention; Figure 5 This is a schematic diagram of the connection between the flexible metal sheet and the limiting member of the present invention; Figure 6 This is a schematic diagram showing the connection between the adjusting cylinder, the guide plate, and the support plate of the present invention; Figure 7 This is a schematic diagram of the connection between the connecting ring and the rear support plate of the present invention.

[0028] Reference numerals: 1. Screw drill bit; 11. Bypass valve assembly; 12. Anti-drop assembly; 13. Motor assembly; 14. Universal joint assembly; 15. Drive shaft assembly; 16. Drill bit assembly; 2. Centering mechanism; 3. Snap ring; 31. Fixed half ring; 32. Injection pipe; 33. Squeezing plate; 34. Moving column; 35. First return spring; 4. Connecting ring; 41. Housing; 42. Liquid storage tank; 43. Connecting groove; 44. Fixed base; 4 5. Valve core; 46. Moving iron core; 47. Third return spring; 48. Fixed iron core; 49. Coil; 5. Fixing ring; 6. Flexible metal sheet; 7. Limiting component; 71. Support plate; 72. Guide plate; 73. Connecting rod; 74. Connecting frame; 75. Sliding block; 76. Limiting spring; 77. Adjusting cylinder; 771. Cylinder body; 772. Connecting pipe; 773. Push plate; 774. Push rod; 775. Second return spring; 8. Hollow screw. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] refer to Figure 1-7 A high-temperature resistant multiphase flow screw drill includes a screw drill 1. The screw drill 1 includes a bypass valve assembly 11, an anti-drop assembly 12, a motor assembly 13, a universal joint assembly 14, a drive shaft assembly 15, and a drill bit assembly 16. The bypass valve assembly 11, the anti-drop assembly 12, the motor assembly 13, the universal joint assembly 14, the drive shaft assembly 15, and the drill bit assembly 16 are connected sequentially from back to front. A centering mechanism 2 is sleeved on the front side of the surface of the motor assembly 13. The centering mechanism 2 includes two retaining rings 3, which are fitted onto the front side of the motor assembly 13. A connecting ring 4 and a fixing ring 5 are disposed between opposite sides of the two retaining rings 3. A flexible metal sheet 6 is annularly welded between the surfaces of the connecting ring 4 and the fixing ring 5. A limiting member 7 is annularly bolted between the opposite sides of the connecting ring 4 and the fixing ring 5, and the limiting member 7 is connected to the side of the flexible metal sheet 6. By fitting the centering mechanism 2 onto the surface of the motor assembly 13, the centering mechanism 2 can be used to adjust the centering position of the screw drill 1 during drilling operations. The device injects oil into the centering mechanism 2, which causes the connecting ring 4 to move under pressure and causes the flexible metal sheet 6 to bend and expand, thus adapting to well walls of different shapes. Therefore, it can always maintain the centering of the screw drill 1, reduce stuck drill phenomenon, and when encountering local protrusions or depressions in the well wall, the limiting component 7 can adjust the opening degree of one or more flexible metal sheets 6 according to the actual contact situation, thereby achieving the effect of fine adjustment of the expansion degree of the flexible metal sheet 6, thus always maintaining good contact with the well wall and ensuring the centering of the screw drill 1.

[0031] like Figure 3As shown, the retaining ring 3 includes two fixed half-rings 31, which are rotatably connected to each other. The two fixed half-rings 31 are respectively sleeved on the top and bottom of the surface of the motor assembly 13. The rear side of the rear fixed half-ring 31 is connected to an injection tube 32. A squeezing plate 33 is slidably arranged inside the fixed half-ring 31, and two moving posts 34 are arranged inside the squeezing plate 33. The moving posts 34 extend to the outside of the fixed half-ring 31 near the connecting ring 4 and the fixed ring 5 and are respectively connected to the connecting ring 4 and the fixed ring 5. A first return spring 35 is sleeved on the surface of the moving posts 34, and the first return spring 35 is respectively connected to the inner wall of the squeezing plate 33 and the fixed half-ring 31. The two are connected by a retaining ring 3, which allows for rotational connection between the two fixed half-rings 31. This facilitates the installation of the centering mechanism 2 onto the motor assembly 13 and also helps to limit the position of the connecting ring 4 and the fixed ring 5. The injection pipe 32 connects to external equipment, which can inject oil into the cavity formed between the fixed half-ring 31 and the extrusion plate 33. Under pressure, the extrusion plate 33 and the moving column 34 will move, and the first return spring 35 will contract, which will push the connecting ring 4 to move. This causes the flexible metal sheet 6 to bend and expand, which can adapt to different well wall shapes. Therefore, the centering of the screw drill 1 can always be maintained, reducing the possibility of stuck drill bit.

[0032] like Figure 1 As shown, the front end of the injection pipe 32 passes through the interior of the motor assembly 13, the anti-drop assembly 12, and the bypass valve assembly 11 in sequence and extends to the outside of the bypass valve assembly 11, and is connected to external equipment. The two fixed half-rings 31 are connected by a fastening structure. By passing through the interior of the motor assembly 13, the anti-drop assembly 12, and the bypass valve assembly 11 in sequence and extending to the outside of the bypass valve assembly 11, the injection pipe 32 can be protected without affecting the normal use of the screw drill 1.

[0033] like Figure 3 As shown, the interior of the front moving column 34 is hollow and communicates with the extrusion plate 33. The interior of the front moving column 34 is threaded with a hollow screw 8, and the hollow screw 8 is in close contact with the connecting ring 4 on the side closest to it. Because the front moving column 34 is hollow and the hollow screw 8 connects the front moving column 34 to the connecting ring 4, some of the injected oil can enter the interior of the connecting ring 4 through the moving column 34 and the hollow screw 8, thereby achieving the effect of pushing the limiting member 7 to make local adjustments to the flexible metal sheet 6.

[0034] like Figure 5As shown, the limiting member 7 includes two support plates 71. The support plates 71 are bolted to the connecting ring 4 and the fixing ring 5 respectively on the side near them. A guide plate 72 is provided on the front side inside the rear support plate 71, and the front side of the guide plate 72 is bolted to the front support plate 71. A connecting rod 73 is provided on the front and rear sides of the support plate 71 opposite to the flexible metal sheet 6, and a connecting frame 74 is rotatably connected to both ends of the surface of the connecting rod 73. One connecting frame 74 is bolted to the side near the flexible metal sheet 6, and a sliding block 75 is bolted to the side of the other connecting frame 74 near the support plate 71. The sliding block 75 is slidably disposed inside the support plate 71. Limiting springs 76 are provided on the opposite sides of the two sliding blocks 75 on the front and rear sides, and the limiting springs 76 are connected to the side near the inner wall of the support plate 71. An adjusting spring is bolted between the guide plate 72 and the opposite side of the flexible metal sheet 6. The section cylinder 77, and the adjusting cylinder 77 are used in conjunction with the connecting ring 4. By setting the limiting component 7, when the connecting ring 4 pushes the flexible metal sheet 6 to bend and expand, it will simultaneously drive the front support plate 71 to slide on the guide plate 72. Under the elastic action of the limiting spring 76, the sliding block 75 and the connecting frame 74 can be pushed to move, so that the connecting rod 73 supports the flexible metal sheet 6, which can improve the stability of the flexible metal sheet 6. When encountering local protrusions or depressions in the well wall, the oil in the connecting ring 4 enters the adjusting cylinder 77 corresponding to the position of the flexible metal sheet 6 that needs to be adjusted, and pushes the push plate 773 to move inside the cylinder 771. This allows the push rod 774 to extend or retract, which can adjust the opening degree of one or more flexible metal sheets 6, thereby achieving the effect of fine adjustment of the expansion degree of the flexible metal sheet 6, and thus always maintaining good contact with the well wall.

[0035] like Figure 6 As shown, the adjusting cylinder 77 includes a cylinder body 771, which is bolted to the side of the guide plate 72 near the flexible metal sheet 6. A connecting pipe 772 is connected to the side of the cylinder body 771 near the guide plate 72, and the rear end of the connecting pipe 772 passes through the interior of the guide plate 72 and the rear support plate 71 in sequence and communicates with the connecting ring 4. A push plate 773 is slidably connected inside the cylinder body 771, and a push rod 774 is bolted to the side of the push plate 773 away from the inner wall of the cylinder body 771. The side of the push rod 774 away from the push plate 773 extends to the outside of the cylinder body 771 and is connected to the flexible metal sheet 6. A second return spring 77 is sleeved on the surface of the push rod 774. 5. The second return spring 775 is connected to the push plate 773 and the inner wall of the cylinder 771 respectively. By setting the adjusting cylinder 77, the oil in the connecting ring 4 can enter the interior of the cylinder 771 through the connecting pipe 772. Under the action of pressure, the push plate 773 can be pushed to move and squeeze the second return spring 775. The push rod 774 can be extended or retracted under the movement of the push plate 773, which can adjust the opening degree of one or more flexible metal sheets 6, thereby achieving the effect of fine adjustment of the expansion degree of the flexible metal sheet 6, thus always maintaining good contact with the well wall and ensuring the centering of the screw drill 1.

[0036] like Figure 7 As shown, the connecting ring 4 includes a housing 41. A liquid storage tank 42 is provided inside the housing 41. Several connecting grooves 43 are annularly formed on the front side of the housing 41. A fixed seat 44 is provided inside each connecting groove 43, and a valve core 45 is tightly fitted inside the fixed seat 44. A moving iron core 46 is welded to one side of the valve core 45. A third return spring 47 is connected to one side of the moving iron core 46. A fixed iron core 48 is provided on the side of the third return spring 47 away from the moving iron core 46. One side of the fixed iron core 48 is connected to the inner wall of the housing 41. A coil 49 is provided inside the housing 41, and the coil 49 is sleeved between the surfaces of the moving iron core 46 and the fixed iron core 48. By providing the connecting ring 4, it is possible to... The incoming oil is stored in the storage tank 42. When encountering a local protrusion or depression in the well wall, the coil 49 is energized to generate a magnetic field, causing the moving iron core 46 and the fixed iron core 48 to generate magnetic force. This causes the moving iron core 46 to move the valve core 45 towards the fixed iron core 48 and squeeze the third return spring 47. This allows the valve core 45 to release the blockage of the fixed seat 44, thus opening the flow channel. The oil in the storage tank 42 can then enter the cylinder 771 through the connecting pipe 772. When the flexible metal sheet 6 does not need to be adjusted, the coil 49 is de-energized and loses its magnetic field. The elasticity of the third return spring 47 causes the moving iron core 46 to push the valve core 45 into contact with the fixed seat 44, thus achieving the blocking of the flow channel.

[0037] like Figure 7 As shown, the rear side of the connecting groove 43 is connected to the liquid storage tank 42, and the hollow screw 8 is located inside the liquid storage tank 42 and is connected to it. By setting the rear side of the connecting groove 43 to be connected to the liquid storage tank 42 and setting the hollow screw 8 to be connected to the liquid storage tank 42, the flow of oil can be realized.

[0038] like Figure 1 As shown, both the screw drill bit 1 and the centering mechanism 2 are made of high-temperature resistant materials. By setting both the screw drill bit 1 and the centering mechanism 2 to be made of high-temperature resistant materials, the screw drill bit 1 and the centering mechanism 2 can adapt to the high-temperature environment in the well, thus ensuring their service life.

[0039] like Figure 1 As shown, a groove is provided on the front side of the surface of the motor assembly 13, and the centering mechanism 2 is located on the surface of the groove. By providing a groove on the front side of the surface of the motor assembly 13, it is convenient to place the centering mechanism 2 on the motor assembly 13.

[0040] Brief description of the usage process: During the drilling process of the screw drill 1, external equipment can be connected through the injection pipe 32. Oil can be injected into the cavity formed between the fixed half-ring 31 and the extrusion plate 33 through the external equipment. Therefore, under pressure, the extrusion plate 33 and the moving column 34 will move, and the first return spring 35 will contract. This will push the connecting ring 4 to move, causing the flexible metal sheet 6 to bend and expand. Simultaneously, the front support plate 71 will slide on the guide plate 72. Under the elastic action of the limit spring 76, the sliding block 75 and the connecting frame 74 will move, thereby allowing the connecting rod 73 to support the flexible metal sheet 6, improving the stability of the flexible metal sheet 6. Furthermore, when encountering local protrusions in the well wall... When the well is depressed, a magnetic field can be generated by energizing the coil 49, causing the moving iron core 46 and the fixed iron core 48 to generate magnetic force. This causes the moving iron core 46 to move the valve core 45 toward the fixed iron core 48 and squeeze the third return spring 47. This allows the valve core 45 to release the blockage of the fixed seat 44, thus opening the flow channel. This allows the oil in the storage tank 42 to enter the cylinder 771 through the connecting pipe 772. Under pressure, the push plate 773 can be pushed to move and squeeze the second return spring 775. The movement of the push plate 773 can drive the push rod 774 to extend or retract, adjusting the opening degree of one or more flexible metal plates 6. This adapts to well walls of different shapes and ensures the centering of the screw drill 1.

[0041] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A high-temperature resistant multiphase flow screw drill, comprising a screw drill (1), characterized in that: The screw drill (1) includes a bypass valve assembly (11), an anti-drop assembly (12), a motor assembly (13), a universal joint assembly (14), a drive shaft assembly (15), and a drill bit assembly (16). The bypass valve assembly (11), the anti-drop assembly (12), the motor assembly (13), the universal joint assembly (14), the drive shaft assembly (15), and the drill bit assembly (16) are connected sequentially from back to front. A centering mechanism (2) is sleeved on the front side of the surface of the motor assembly (13). The centering mechanism (2) includes two retaining rings (3), and the two retaining rings (3) are sleeved on the front side of the surface of the motor assembly (13). A connecting ring (4) and a fixing ring (5) are provided between the opposite sides of the two retaining rings (3). A flexible metal sheet (6) is welded in an annular manner between the surfaces of the connecting ring (4) and the fixing ring (5). A limiting member (7) is bolted in an annular manner between the opposite sides of the connecting ring (4) and the fixing ring (5). The limiting member (7) is connected to the side of the flexible metal sheet (6) near it. The retaining ring (3) includes two fixed half-rings (31), which are rotatably connected to each other. The two fixed half-rings (31) are respectively sleeved on the top and bottom of the surface of the motor assembly (13). The rear side of the rear fixed half-ring (31) is connected to the injection tube (32). The inside of the fixed half-ring (31) is slidably provided with a squeezing plate (33), and the inside of the squeezing plate (33) is provided with two moving columns (34). The side of the moving column (34) close to the connecting ring (4) and the fixed ring (5) extends to the outside of the fixed half-ring (31) and is connected to the connecting ring (4) and the fixed ring (5) respectively. The surface of the moving column (34) is sleeved with a first return spring (35), and the side of the first return spring (35) close to the inner wall of the squeezing plate (33) and the fixed half-ring (31) is connected to both respectively. The front end of the injection tube (32) passes through the interior of the motor assembly (13), the anti-drop assembly (12) and the bypass valve assembly (11) in sequence and extends to the outside of the bypass valve assembly (11), and is connected to external equipment. The two fixed half rings (31) are connected by a fastening structure. The interior of the front moving column (34) is hollow and communicates with the extrusion plate (33). The interior of the front moving column (34) is threaded with a hollow screw (8), and the hollow screw (8) is in close contact with the side of the connecting ring (4). The limiting member (7) includes two support plates (71). The support plates (71) are bolted to the connecting ring (4) and the fixing ring (5) respectively on the side near the connecting ring (4) and the fixing ring (5). A guide plate (72) is provided on the front side inside the rear support plate (71), and the front side of the guide plate (72) is bolted to the front support plate (71). A connecting rod (73) is provided on the front and rear sides of the support plate (71) opposite to the flexible metal sheet (6), and a connecting frame (74) is rotatably connected to both ends of the surface of the connecting rod (73). One side of the connecting frame (74) is close to the flexible metal sheet (6). One side of the guide plate (72) is bolted to it, and the other side of the connecting frame (74) is bolted to the side of the support plate (71) with a sliding block (75). The sliding block (75) is slidably disposed inside the support plate (71). Limiting springs (76) are provided on opposite sides of the two sliding blocks (75) on the front and rear sides, and the limiting springs (76) are connected to the side of the inner wall of the support plate (71). An adjusting cylinder (77) is bolted between the guide plate (72) and the opposite side of the flexible metal sheet (6), and the adjusting cylinder (77) is used in conjunction with the connecting ring (4). The regulating cylinder (77) includes a cylinder body (771), which is bolted to the side of the guide plate (72) near the flexible metal sheet (6). The side of the cylinder body (771) near the guide plate (72) is connected to a connecting pipe (772), and the rear end of the connecting pipe (772) passes through the interior of the guide plate (72) and the rear support plate (71) in sequence and is connected to the connecting ring (4). The inside of the cylinder body (771) is slidably connected to a push plate (773), and a push rod (774) is bolted to the side of the push plate (773) away from the inner wall of the cylinder body (771). The side of the push rod (774) away from the push plate (773) extends to the outside of the cylinder body (771) and is connected to the flexible metal sheet (6). A second return spring (775) is sleeved on the surface of the push rod (774), and the side of the second return spring (775) near the push plate (773) and the inner wall of the cylinder body (771) is connected to both respectively. The connecting ring (4) includes a housing (41), the inside of which is provided a liquid storage tank (42), and the front side of the inside of the housing (41) is provided with several connecting grooves (43) in an annular shape. The inside of the connecting grooves (43) is provided with a fixed seat (44), and the inside of the fixed seat (44) is tightly fitted with a valve core (45). A moving iron core (46) is welded to one side of the valve core (45), and a third return spring (47) is connected to one side of the moving iron core (46). A fixed iron core (48) is provided on the side of the third return spring (47) away from the moving iron core (46). One side of the fixed iron core (48) is connected to the inner wall of the housing (41). A coil (49) is provided inside the housing (41), and the coil (49) is sleeved between the surfaces of the moving iron core (46) and the fixed iron core (48). The rear side of the connecting groove (43) is connected to the liquid storage tank (42), and the hollow screw (8) is located inside the liquid storage tank (42) and is connected to it.

2. The high-temperature resistant multiphase flow screw drill bit according to claim 1, characterized in that: Both the screw drill (1) and the centering mechanism (2) are made of high-temperature resistant materials.

3. The high-temperature resistant multiphase flow screw drill bit according to claim 1, characterized in that: The front side of the surface of the motor assembly (13) is provided with a groove, and the centering mechanism (2) is located on the surface of the groove.

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