High-temperature-resistant multiphase flow screw drill

Abstract

The invention discloses a high-temperature-resistant multi-phase flow screw drill which is applied to the technical field of multi-phase flow screw drills and is characterized in that a centering mechanism is arranged, and the surface of a motor assembly is sleeved with the centering mechanism, so that oil liquid can be injected into the centering mechanism through external equipment in the tripping process of the screw drill; under the action of pressure, the connecting ring can move and promote the flexible metal sheet to bend and expand, so that the screw drilling tool can adapt to well walls with different shapes, the centering property of the screw drilling tool can be always kept, the drilling tool jamming phenomenon is reduced, and when the well walls locally protrude or sink, the drilling tool cannot be damaged. The expansion degree of one or more flexible metal sheets can be adjusted according to the actual contact condition through the limiting piece, so that the effect of finely adjusting the expansion degree of the flexible metal sheets is achieved, good contact with the well wall is kept all the time, and the centering performance of the screw drill is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of multiphase flow screw drill tools, and in particular relates to a high temperature resistant multiphase flow screw drill tool. Background Art

[0002] Multiphase screw drilling tools are a type of volumetric downhole power drilling tool that uses drilling fluid as its motive force and converts 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 at 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] The structure of the screw drill is relatively complex. During the drilling process, especially in small wellbores or wells with complex wellbore structures, when the well wall becomes irregular, it is easy for friction to occur between the screw drill and the well wall, resulting in problems such as drill sticking in the screw drill, thus affecting the use of the screw drill.

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

[0005] The purpose of the present invention is to target an existing high-temperature resistant multiphase flow screw drill, which has the advantage of arranging a centering mechanism. By mounting the centering mechanism on the surface of a motor assembly, oil can be injected into the centering mechanism through external equipment during the process of the screw drill being lifted and lowered, and the connecting ring can be moved under the action of pressure to cause the flexible metal sheet to bend and expand, thereby being able to adapt to well walls of different shapes. Therefore, the centering of the screw drill can be maintained at all times, and the drill sticking phenomenon can be reduced. When encountering local protrusions or depressions on the well wall, the limiter can adjust the degree of opening of one or more flexible metal sheets according to the actual contact situation, thereby achieving the effect of fine-tuning the degree of expansion of the flexible metal sheet, thereby always maintaining good contact with the well wall and ensuring the centering of the screw drill.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A high temperature resistant multiphase flow screw drill, comprising a screw drill, the screw drill comprising a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal shaft assembly, a transmission shaft assembly and a drill assembly, the bypass valve assembly, the anti-drop assembly, the motor assembly, the universal shaft assembly, the transmission shaft assembly and the drill assembly are sequentially connected from back to front, and a centering mechanism is sleeved on the front side of the surface of the motor assembly;

[0007] The centering mechanism includes two snap rings, and the two snap rings are sleeved on the front side of the motor assembly surface, a connecting ring and a fixing ring are arranged between the opposite sides of the two snap rings, and a flexible metal sheet is welded in a ring shape between the surfaces of the connecting ring and the fixing ring, a limiting member is bolted in a ring shape between the connecting ring and the opposite side of the fixing ring, and the limiting member is connected to the flexible metal sheet on the side close to the limiting member.

[0008] By adopting the above technical solution, a centering mechanism is set, and the centering mechanism is mounted on the surface of the motor assembly. During the process of the screw drill bit being lifted and lowered, oil can be injected into the centering mechanism through external equipment, and the connecting ring can be moved under the action of pressure to cause the flexible metal sheet to bend and expand, thereby being able to adapt to well walls of different shapes. Therefore, the centering of the screw drill bit can be maintained at all times, and the drill sticking phenomenon can be reduced. When encountering local protrusions or depressions on the well wall, the limiter can adjust the degree of opening of one or more flexible metal sheets according to the actual contact situation, thereby achieving the effect of fine-tuning the degree of expansion of the flexible metal sheet, thereby always maintaining good contact with the well wall and ensuring the centering of the screw drill bit.

[0009] The present invention is further configured as follows: the retaining ring includes two fixed half rings, and the two fixed half rings are rotatably connected, 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 the injection tube, an extrusion plate is slidably arranged inside the fixed half ring, and two movable columns are arranged inside the extrusion plate, the side of the movable column close to 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, the surface of the movable column is sleeved with a first return spring, and the side of the first return spring close to the extrusion plate and the inner wall of the fixed half ring is respectively connected to the two.

[0010] By adopting the above technical solution, a retaining ring is set, and the rotational connection between the two fixed half rings can be used to facilitate the installation of the centering mechanism on the motor assembly, and at the same time, it is convenient to limit the position of the connecting ring and the fixed ring. By connecting the external equipment through the injection pipe, the oil can be injected into the cavity formed between the fixed half ring and the extrusion plate through the external equipment. Therefore, under the action of pressure, the extrusion plate and the movable column are pushed to move, and the first return spring is contracted, which can push the connecting ring to move, so that the flexible metal sheet is bent and expanded, and can adapt to well walls of different shapes. Therefore, the centering of the screw drill can be always maintained, and the drill sticking phenomenon can be reduced.

[0011] The present invention is further configured as follows: the front end of the injection pipe sequentially passes through the outside of the motor assembly, the anti-drop assembly and the bypass valve assembly, and is connected to external equipment, and the two fixed half rings are connected by a fastening structure.

[0012] By adopting the above technical solution, the front end of the injection pipe passes through the outside of the motor assembly, the anti-drop assembly and the bypass valve assembly in sequence, which can protect the injection pipe without affecting the normal use of the screw drill.

[0013] The present invention is further configured as follows: the interior of the front moving column is hollow and connected to the extrusion plate; the interior thread of the front moving column is connected to a hollow screw, and the hollow screw is in close contact with the connecting ring on one side thereof.

[0014] By adopting the above technical solution, the front moving column is hollow and connected to the connecting ring through a hollow screw, so that part of the injected oil can enter the interior of the connecting ring through the moving column and the hollow screw, thereby achieving the effect of allowing part of the oil to push the limit piece to make local adjustments to the flexible metal sheet.

[0015] The present invention is further configured as follows: the limit member includes two support plates, and the support plate is bolted to the connecting ring and the fixing ring on one side thereof close to the two respectively; a guide plate is arranged on the front side inside the rear support plate, and the front side of the guide plate is bolted to the front support plate; connecting rods are arranged on the front and rear sides of the support plate opposite to the flexible metal sheet, and both ends of the connecting rod surface are rotatably connected to connecting frames, one side of the connecting frame close to the flexible metal sheet is bolted to it, and the other side of the connecting frame close to the support plate is bolted to a sliding block, the sliding block is slidably arranged inside the support plate, and limiting springs are arranged on the opposite sides of the two sliding blocks on the front and rear sides, and the limiting spring is connected to it on the side close to the inner wall of the support plate, 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.

[0016] By adopting the above technical solution, by setting a limit piece, 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, and through the elastic action of the limit spring, it can push the sliding block and the connecting frame to move, so that the connecting rod supports the flexible metal sheet, which can improve the stability of the flexible metal sheet, and when encountering local protrusions or depressions on the well wall, the oil in the connecting ring enters the adjustment cylinder corresponding to the flexible metal sheet position that needs to be adjusted, and pushes the push plate to move inside the cylinder, so that the push rod can be extended or retracted to adjust the degree of opening of one or more flexible metal sheets, thereby achieving the effect of fine-tuning the degree of expansion of the flexible metal sheet, and thus always maintaining good contact with the well wall.

[0017] The present invention is further configured as follows: the adjusting cylinder includes a cylinder body, the cylinder body is bolted to the side of the guide plate close to the flexible metal sheet, the side of the cylinder body close to 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 the connecting ring, the interior of the cylinder body is slidably connected to a push plate, and the side of the push plate away from the inner wall of the cylinder is bolted to a push rod, the side of the push rod away from the push plate extends to the outside of the cylinder body and is connected to the flexible metal sheet, the surface of the push rod is sleeved with a second return spring, and the side of the second return spring close to the push plate and the inner wall of the cylinder is respectively connected to the two.

[0018] By adopting the above technical solution, through setting up an adjusting cylinder, the oil in the connecting ring can enter the interior of the cylinder through the connecting pipe, and under the action of pressure, the push plate can be pushed to move and squeeze the second return spring. The push rod can be driven to extend or retract under the movement of the push plate, and the opening degree of one or more flexible metal sheets can be adjusted, thereby achieving the effect of fine-tuning the expansion degree of the flexible metal sheet, thereby always maintaining good contact with the well wall and ensuring the centering of the screw drilling tool.

[0019] The present invention is further configured as follows: the connecting ring includes a shell, a liquid storage tank is opened inside the shell, and a plurality of connecting grooves are opened in a ring shape on the front side of the shell, a fixing seat is arranged inside the connecting groove, and a valve core is tightly fitted inside the fixing seat, a moving iron core is welded on 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 arranged 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 shell, a coil is arranged inside the shell, and the coil is sleeved between the surfaces of the moving iron core and the fixed iron core.

[0020] By adopting the above technical scheme, a connecting ring is set up, and the incoming oil can be stored through the liquid storage tank. When encountering a local bulge or depression on the well wall, the coil can be energized to generate a magnetic field, so that the moving iron core and the fixed iron core generate magnetic force, thereby making the moving iron core drive the valve core to move toward the fixed iron core and squeeze the third reset spring, so that the valve core can release the blockage of the fixed seat and realize the connection of the flow channel, and the oil in the liquid storage tank can enter the cylinder through the connecting pipe without adjusting the flexible metal sheet. When the coil is powered off and the magnetic field is lost, the elasticity of the third reset spring is used to make the moving iron core push the valve core to contact the fixed seat, thereby realizing the blocking of the flow channel.

[0021] The present invention is further configured as follows: the rear side of the communicating groove is communicated with the liquid storage tank, and the hollow screw is located inside the liquid storage tank and is communicated with the liquid storage tank.

[0022] By adopting the above technical solution, the flow of oil can be achieved by arranging the rear side of the connecting groove to be connected with the liquid storage tank, and arranging the connection between the hollow screw and the liquid storage tank.

[0023] The present invention is further configured as follows: the screw drill and the centering mechanism are both made of high temperature resistant materials.

[0024] By adopting the above technical solution, the screw drill and the centering mechanism are made of high temperature resistant materials, so that the screw drill and the centering mechanism can adapt to the high temperature environment in the well, thereby ensuring their service life.

[0025] The present invention is further configured as follows: 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.

[0026] By adopting the above technical solution, by providing a groove on the front side of the motor assembly surface, it is convenient to arrange the centering mechanism on the motor assembly.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. By setting a centering mechanism and sleeve the centering mechanism on the surface of the motor assembly, oil can be injected into the centering mechanism through external equipment during the process of the screw drill bit being lifted and lowered. Under the action of pressure, the connecting ring can be moved and the flexible metal sheet can be bent and expanded, so that it can adapt to well walls of different shapes. Therefore, the centering of the screw drill bit can be always maintained, and the drill sticking phenomenon can be reduced.

[0029] 2. By setting the limiter and the connecting ring for use, when encountering local protrusions or depressions on the well wall, the limiter can adjust the degree of opening 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 sheet, thereby always maintaining good contact with the well wall and ensuring the centration of the screw drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the centering mechanism structure of the present invention;

[0032] Figure 3 is a schematic cross-sectional view of a snap ring of the present invention;

[0033] Figure 4 It is a schematic diagram of the connection between the fixing ring, the connecting ring, the flexible metal sheet and the limiting member of the present invention;

[0034] Figure 5 It is a schematic diagram of the connection between the flexible metal sheet and the limiter of the present invention;

[0035] Figure 6 It is a schematic diagram of the connection between the adjustment cylinder, the guide plate and the support plate of the present invention;

[0036] Figure 7It is a schematic diagram of the connection between the connecting ring and the rear support plate of the present invention.

[0037] Reference numerals: 1, screw drill; 11, bypass valve assembly; 12, anti-drop assembly; 13, motor assembly; 14, universal shaft assembly; 15, transmission shaft assembly; 16, drill assembly; 2, centering mechanism; 3, snap ring; 31, fixed half ring; 32, injection pipe; 33, extrusion plate; 34, moving column; 35, first return spring; 4, connecting ring; 41, housing; 42, liquid storage tank; 43, connecting tank; 44, fixed seat; 4 5. Valve core; 46. Moving iron core; 47. Third return spring; 48. Fixed iron core; 49. Coil; 5. Fixed ring; 6. Flexible metal sheet; 7. Limiting member; 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 DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] refer to Figure 1-7 A high temperature resistant multiphase flow screw drill comprises a screw drill 1, wherein the screw drill 1 comprises a bypass valve assembly 11, an anti-drop assembly 12, a motor assembly 13, a universal shaft assembly 14, a transmission shaft assembly 15 and a drill assembly 16, wherein the bypass valve assembly 11, the anti-drop assembly 12, the motor assembly 13, the universal shaft assembly 14, the transmission shaft assembly 15 and the drill assembly 16 are sequentially connected from the back to the front, and a centering mechanism 2 is sleeved on the front side of the surface of the motor assembly 13;

[0040] The centering mechanism 2 includes two clamping rings 3, and the two clamping 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 arranged between the opposite sides of the two clamping rings 3, and a flexible metal sheet 6 is welded in an annular shape between the surfaces of the connecting ring 4 and the fixing ring 5, and a limiting member 7 is bolted in an annular shape between the opposite sides of the connecting ring 4 and the fixing ring 5, and the limiting member 7 is connected to the flexible metal sheet 6 on the side close to the limiting member 7. By means of the centering mechanism 2, by sleeved on the surface of the motor assembly 13, the screw drill 1 can be raised and lowered through the external The boundary device injects oil into the centering mechanism 2, which can move the connecting ring 4 under pressure and cause the flexible metal sheet 6 to bend and expand, so that it can adapt to well walls of different shapes. Therefore, the centering of the screw drill 1 can be maintained at all times, and the drill sticking phenomenon can be reduced. When encountering local protrusions or depressions on the well wall, the limiter 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-tuning the expansion degree of the flexible metal sheet 6, thereby always maintaining good contact with the well wall and ensuring the centering of the screw drill 1.

[0041] like Figure 3 As shown, the clamping ring 3 includes two fixed half rings 31, and the two fixed half rings 31 are rotatably connected. 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 with a liquid injection pipe 32. An extrusion plate 33 is slidably arranged inside the fixed half ring 31, and two moving columns 34 are arranged inside the extrusion plate 33. The side of the moving column 34 close to the connecting ring 4 and the fixing ring 5 extends to the outside of the fixed half ring 31 and is respectively connected to the connecting ring 4 and the fixing ring 5. 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 extrusion plate 33 and the inner wall of the fixed half ring 31 is respectively connected to The two are connected by setting a retaining ring 3, and the rotation connection between the two fixed half rings 31 can facilitate the installation of the centering mechanism 2 on the motor assembly 13, and at the same time facilitate the limitation of the position of the connecting ring 4 and the fixed ring 5. The external equipment is connected through the injection pipe 32, and the 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 the action of pressure, the extrusion plate 33 and the movable column 34 are pushed to move, and the first return spring 35 is contracted, which can push the connecting ring 4 to move, so that the flexible metal sheet 6 is bent and expanded, and can adapt to the well wall of different shapes. Therefore, the centering of the screw drill 1 can be always maintained, and the drill sticking phenomenon can be reduced.

[0042] like Figure 1 As shown, the front end of the injection pipe 32 sequentially penetrates the outside of the motor assembly 13, the anti-drop assembly 12 and the bypass valve assembly 11, and is connected to external equipment. The two fixed half rings 31 are connected by a fastening structure. The front end of the injection pipe 32 sequentially penetrates the outside of the motor assembly 13, the anti-drop assembly 12 and the bypass valve assembly 11, so that the injection pipe 32 can be protected without affecting the normal use of the screw drilling tool 1.

[0043] like Figure 3 As shown, the interior of the front moving column 34 is hollow and connected to the extrusion plate 33. The interior thread of the front moving column 34 is connected to a hollow screw 8, and the hollow screw 8 is in close contact with the connecting ring 4 on one side. The front moving column 34 is hollow and connected to the connecting ring 4 through the hollow screw 8, so that part 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 allowing part of the oil to push the limit member 7 to make a local adjustment to the flexible metal sheet 6.

[0044] like Figure 5The cam 72 is provided with a guide plate 72 on the front side of the rear support plate 71, and the front side of the guide plate 72 is bolted to the front support plate 71. The front and rear sides of the support plate 71 opposite to the flexible metal sheet 6 are provided with connecting rods 73, and both ends of the surface of the connecting rods 73 are rotatably connected to connecting frames 74. One side of the connecting frame 74 is bolted to the flexible metal sheet 6, and the other side of the connecting frame 74 is bolted to the side of the support plate 71. The sliding block 75 is slidably arranged inside the support plate 71, and the opposite sides of the two sliding blocks 75 on the front and rear sides are provided with limiting springs 76, and the side of the limiting spring 76 close to the inner wall of the support plate 71 is connected to it. An adjusting spring 76 is bolted between the guide plate 72 and the side opposite to 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 limit piece 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, and under the elastic action of the limit 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, and when encountering local protrusions or depressions on 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 to be adjusted, and pushes the push plate 773 to move inside the cylinder body 771, so that the push rod 774 can be extended or retracted to adjust the degree of opening of one or more flexible metal sheets 6, thereby achieving the effect of fine-tuning the degree of expansion of the flexible metal sheet 6, and thus always maintaining good contact with the well wall.

[0045] like Figure 6 As shown, the adjustment cylinder 77 includes a cylinder body 771, which is bolted to the side of the guide plate 72 close to the flexible metal sheet 6, and the side of the cylinder body 771 close to 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 cylinder body 771 is slidably connected to a push plate 773, and the side of the push plate 773 away from the inner wall of the cylinder body 771 is bolted to a push rod 774, 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, and the surface of the push rod 774 is sleeved with a second return spring 77 5, and the second return spring 775 is connected to the push plate 773 and the inner wall of the cylinder 771 on one side thereof, 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, and under the action of pressure, the push plate 773 can be pushed to move and squeeze the second return spring 775, and the push rod 774 can be driven to extend or contract under the movement of the push plate 773, so as to adjust the opening degree of one or more flexible metal sheets 6, thereby achieving the effect of fine-tuning the expansion degree of the flexible metal sheets 6, thereby always maintaining good contact with the well wall, and ensuring the centering of the screw drilling tool 1.

[0046] like Figure 7 As shown, the connecting ring 4 includes a shell 41, a liquid storage tank 42 is provided inside the shell 41, and a plurality of connecting grooves 43 are provided in an annular shape on the front side of the shell 41, a fixing seat 44 is provided inside the connecting groove 43, and a valve core 45 is tightly fitted inside the fixing seat 44, a moving iron core 46 is welded on one side of the valve core 45, a third return spring 47 is connected to one side of the moving iron core 46, and a fixed iron core 48 is provided on the side of the third return spring 47 away from the moving iron core 46, and one side of the fixed iron core 48 is connected to the inner wall of the shell 41, a coil 49 is provided inside the shell 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, The incoming oil is stored in the liquid storage tank 42. When encountering a local protrusion or depression on the well wall, the coil 49 can be energized to generate a magnetic field, so that the moving iron core 46 and the fixed iron core 48 generate magnetic force, so that the moving iron core 46 drives the valve core 45 to move toward the fixed iron core 48 and squeeze the third reset spring 47, so that the valve core 45 can release the blockage of the fixed seat 44 to achieve the connection of the flow channel, and the oil in the liquid storage tank 42 can enter the cylinder 771 through the connecting pipe 772 without adjusting the flexible metal sheet 6. When the coil 49 is powered off and the magnetic field is lost, the elasticity of the third reset spring 47 is used to make the moving iron core 46 push the valve core 45 to contact with the fixed seat 44, thereby achieving the blocking of the flow channel.

[0047] 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 connected thereto. By setting the rear side of the connecting groove 43 to be connected to the liquid storage tank 42 and setting the connection between the hollow screw 8 and the liquid storage tank 42, the flow of oil can be achieved.

[0048] like Figure 1 As shown, the screw drill 1 and the centering mechanism 2 are both made of high temperature resistant materials. By arranging that the screw drill 1 and the centering mechanism 2 are both made of high temperature resistant materials, the screw drill 1 and the centering mechanism 2 can adapt to the high temperature environment in the well, ensuring the service life.

[0049] 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 , the centering mechanism 2 can be conveniently arranged on the motor assembly 13 .

[0050] Brief description of the use process: During the process of the screw drill 1 being lifted and lowered into the hole, the external equipment can be connected through the injection pipe 32, and the 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 the action of pressure, the extrusion plate 33 and the moving column 34 are pushed to move, and the first return spring 35 is contracted, which can push the connecting ring 4 to move to cause the flexible metal sheet 6 to bend and expand, and simultaneously drive the front side support plate 71 to slide on the guide plate 72, and through the elastic action of the limit 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, and when encountering local protrusions or When recessed, the coil 49 can be energized to generate a magnetic field, so that the moving iron core 46 and the fixed iron core 48 generate magnetic force, so that the moving iron core 46 drives the valve core 45 to move toward the fixed iron core 48 and squeeze the third reset spring 47, so that the valve core 45 can release the blockage of the fixed seat 44 and realize the connection of the flow channel, and the oil in the liquid storage tank 42 can enter the cylinder 771 through the connecting pipe 772, and under the action of pressure, the push plate 773 can be pushed to move and squeeze the second reset spring 775, and the push rod 774 can be driven to extend or retract under the movement of the push plate 773, so as to adjust the opening degree of one or more flexible metal sheets 6, adapt to well walls of different shapes, and ensure the centering of the screw drilling tool 1.

[0051] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high temperature resistant multiphase flow screw drill, comprising a screw drill (1), characterized in that: The screw drill (1) comprises a bypass valve assembly (11), an anti-drop assembly (12), a motor assembly (13), a universal shaft assembly (14), a transmission 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 shaft assembly (14), the transmission shaft assembly (15) and the drill bit assembly (16) are connected in sequence from the back to the front; and a centering mechanism (2) is sleeved on the front side of the surface of the motor assembly (13); The centering mechanism (2) comprises two snap rings (3), and the two snap 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 arranged between the opposite sides of the two snap rings (3), and a flexible metal sheet (6) is welded in an annular shape between the surfaces of the connecting ring (4) and the fixing ring (5), a limiting member (7) is bolted in an annular shape between the opposite sides of the connecting ring (4) and the fixing ring (5), and the limiting member (7) is connected to the flexible metal sheet (6) on a side close to the limiting member (7).

2. The high temperature resistant multiphase flow screw drill according to claim 1, characterized in that: The clamping ring (3) comprises two fixed half rings (31), and the two fixed half rings (31) 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 a liquid injection pipe (32). An extrusion plate (33) is slidably arranged inside the fixed half ring (31), and two movable columns (34) are arranged inside the extrusion plate (33). The side of the movable 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 respectively connected to the connecting ring (4) and the fixed ring (5). A first return spring (35) is sleeved on the surface of the movable column (34), and the side of the first return spring (35) close to the extrusion plate (33) and the inner wall of the fixed half ring (31) are respectively connected to the two.

3. The high temperature resistant multiphase flow screw drill according to claim 2, characterized in that: The front end of the injection pipe (32) passes through the outside of the motor assembly (13), the anti-drop assembly (12) and the bypass valve assembly (11) in sequence, and is connected to external equipment. The two fixed half rings (31) are connected by a fastening structure.

4. The high temperature resistant multiphase flow screw drill according to claim 2, characterized in that: The interior of the front moving column (34) is hollow and communicated with the extrusion plate (33). The interior of the front moving column (34) is threadedly connected with a hollow screw (8), and the hollow screw (8) is in close contact with the connecting ring (4) on one side thereof.

5. The high temperature resistant multiphase flow screw drill according to claim 4, characterized in that: The limiting member (7) comprises two support plates (71), and the support plates (71) are respectively bolted to the connecting ring (4) and the fixing ring (5) on one side thereof; a guide plate (72) is arranged on the front side of the rear support plate (71), and the front side of the guide plate (72) is bolted to the front support plate (71); the support plate (71) is provided with connecting rods (73) on the front side and the rear side thereof opposite to the flexible metal sheet (6), and both ends of the surface of the connecting rod (73) are rotatably connected to connecting frames (74), and one side of the connecting frame (74) is close to the flexible metal sheet (6). ) is bolted to one side thereof, and a sliding block (75) is bolted to one side of the connecting frame (74) on the other side near the supporting plate (71), and the sliding block (75) is slidably arranged inside the supporting plate (71), and limiting springs (76) are arranged on opposite sides of the two sliding blocks (75) on the front and rear sides, and the limiting springs (76) are connected to the supporting plate (71) on the side near the inner wall of the supporting plate (71), and an adjusting cylinder (77) is bolted between the opposite sides of the guide plate (72) and the flexible metal sheet (6), and the adjusting cylinder (77) is used in conjunction with the connecting ring (4).

6. The high temperature resistant multiphase flow screw drill according to claim 5, characterized in that: The adjusting cylinder (77) comprises a cylinder body (771), the cylinder body (771) is bolted to a side of the guide plate (72) close to the flexible metal sheet (6), a connecting pipe (772) is connected to the side of the cylinder body (771) close to the guide plate (72), and a rear end of the connecting pipe (772) sequentially passes through the inside of the guide plate (72) and the rear side support plate (71) and is connected to the connecting ring (4), and a push plate (773) is slidably connected to the inside of the cylinder body (771) A push rod (774) is bolted to the side of the push plate (773) away from the inner wall of the cylinder (771), and the side of the push rod (774) away from the push plate (773) extends to the outside of the cylinder (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) close to the push plate (773) and the inner wall of the cylinder (771) is respectively connected to the two.

7. The high temperature resistant multiphase flow screw drill according to claim 6, characterized in that: The connecting ring (4) comprises a shell (41), a liquid storage tank (42) is provided inside the shell (41), and a plurality of connecting grooves (43) are provided in an annular shape on the front side of the shell (41), a fixing seat (44) is provided inside the connecting groove (43), and a valve core (45) is tightly fitted inside the fixing 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), and 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 shell (41), a coil (49) is provided inside the shell (41), and the coil (49) is sleeved between the surfaces of the moving iron core (46) and the fixed iron core (48).

8. The high temperature resistant multiphase flow screw drill according to claim 7, characterized in that: The rear side of the communication groove (43) is in communication with the liquid storage tank (42), and the hollow screw (8) is located inside the liquid storage tank (42) and is in communication with the liquid storage tank (42).

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

10. The high temperature resistant multiphase flow screw drill according to claim 1, characterized in that: 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.

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