CN111648736A - Diameter-variable mill shoe for well repair and pipe column assembly using same - Google Patents
Diameter-variable mill shoe for well repair and pipe column assembly using same Download PDFInfo
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- CN111648736A CN111648736A CN202010495495.5A CN202010495495A CN111648736A CN 111648736 A CN111648736 A CN 111648736A CN 202010495495 A CN202010495495 A CN 202010495495A CN 111648736 A CN111648736 A CN 111648736A
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- blade
- joint
- shoe body
- shoe
- pipe column
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
Abstract
The invention relates to a reducing mill shoe for well repair and a pipe column assembly using the same. The variable-diameter milling shoe for well repair comprises a milling shoe body, a joint and a blade, wherein the joint is used for connecting a pipe column, the joint is in rotation stopping fit with the milling shoe body and can move in a guiding mode relative to the milling shoe body in the axial direction of the milling shoe body, the blade is assembled on the joint, and when the joint moves downwards relative to the milling shoe body, the blade swings relative to the milling shoe body. This diameter-variable milling shoe for well workover increases the grinding scope through the outer pendulum of blade when using to can clear away the granule precipitate in the big diameter sleeve pipe portion of lower part of the big well casing pipe of upper portion internal diameter little, the big well casing pipe of lower part internal diameter, reduce the formation of cyclic annular residue, just also be difficult to cause the condition emergence that tubular column card bored and oil-water well were scrapped.
Description
Technical Field
The invention belongs to the technical field of oil field workover treatment, and particularly relates to a variable-diameter mill shoe for workover and a tubular column assembly using the same.
Background
In the well repairing process of oil, gas and water wells, in order to recover stratum energy, hard particle sediments such as cement plugs, asphaltine, cemented sand and the like in a well casing need to be removed. At present, hard particle precipitates in a well casing are removed by a common milling tool, the milling tool is commonly called a milling shoe, the milling part of the milling shoe is made of hard alloy which is subjected to surfacing, the particle precipitates are ground by the hard alloy which is subjected to surfacing, if the outer diameter of the milling shoe is consistent with the inner diameter of the casing, the casing is difficult to run in, and the inner wall of the casing which does not need to be operated is damaged, so that the milling shoe with the corresponding specification is usually selected according to the standard which is 6-8mm smaller than the inner diameter of the casing, the milling shoe is connected into the well casing at the lowest end of a pipe column, and the milling shoe is rotationally drilled through the ground or a downhole power device and circulating equipment to remove the particle precipitates.
The prior art of the grinding shoe is shown as a Chinese utility model patent with an authorization publication number of CN2349344Y, and the grinding shoe comprises a reducing rod body, wherein the reducing rod body comprises a thick section and a thin section, four cutter plate bodies are inserted and welded on a reducing end surface of the reducing rod body, the cutter plate bodies are arranged along the reducing end in a cross manner, each cutter plate body is densely provided with hard alloy blocks with cutting edges, each hard alloy block is in a short cylindrical shape, and the circumference of each hard alloy block is provided with an arc-shaped cutting edge so as to have no dead angle during cutting; among the four knife plate bodies, the hard alloy blocks on the knife plate body which are symmetrical relative to the circle center are arranged in the same way. During the use, the drilling rod drives the junk mill rotation, and when contacting the waste pipe that needs clear away, the thin section can fix a position in inserting the waste pipe, and when the cutter plate body contacted waste pipe terminal surface, mill it.
In the process of well repairing operation, the condition that a well hole is irregular or a downhole casing is expanded is usually met, the casing is in a state that the inner diameter of the upper part is small and the inner diameter of the lower part is large, at the moment, in order to ensure that a grinding shoe can normally pass through the casing, the specification of the grinding shoe can be selected only according to the casing at the position with the minimum inner diameter of the upper part, so that the difference between the outer diameter of the grinding shoe and the inner diameter of the lower part of the casing is overlarge, hard particle precipitates such as cement plugs, asphaltine, cemented sand and the like in the casing cannot be completely removed in the rotary drilling process by using the grinding shoe in the patent literature, annular residues are easily formed on the inner wall of the casing with the large inner diameter of the lower part, and when a large-diameter tool or a perforation is used, a pipe column.
Disclosure of Invention
The invention aims to provide a variable-diameter grinding shoe for well repair, which solves the technical problems that the grinding shoe in the prior art is not easy to remove particle sediments in a downhole casing with small upper inner diameter and large lower inner diameter, so that a pipe column is easy to block a drill, and even an oil-water well is scrapped; the invention also aims to provide a pipe column assembly using the well repairing reducing mill shoe.
In order to achieve the purpose, the technical scheme of the reducing mill shoe for well repair is as follows:
the reducing mill shoe for well repair comprises:
grinding the shoe body;
the joint is used for connecting the pipe column, is in anti-rotation fit with the milling shoe body and can move in a guiding way relative to the milling shoe body in the axial direction of the milling shoe body;
and the blade is assembled on the joint and swings relative to the outer part of the shoe body when the joint moves downwards relative to the shoe body.
The diameter-variable mill shoe for well repair has the beneficial effects that: when the reducing milling shoe for well repair is used, the joint is connected with the pipe column, then the reducing milling shoe for well repair is put into a casing pipe in a well, when the milling shoe body contacts hard particle sediment in the casing pipe, the pipe column is put continuously, the joint moves along the axial direction of the milling shoe body under the action of drilling pressure, the blade moves along with the joint, and in the moving process, the blade swings outwards relative to the milling shoe body, namely the blade expands outwards, so that the cutting range of the blade is enlarged. The diameter-variable milling shoe for well repair increases the grinding diameter through the outward swinging of the blade, further increases the grinding range, and can remove particle sediments in the lower large-diameter casing part of the underground casing with small upper inner diameter and large lower inner diameter, thereby reducing the formation of annular residues and avoiding the occurrence of the condition that a pipe column is stuck and an oil-water well is scrapped.
Furthermore, a blade mounting groove is formed in the joint, a pin shaft is arranged in the blade mounting groove, and the blade is assembled on the joint through the pin shaft.
Has the advantages that: the joint is provided with a blade mounting groove, and the blade is mounted in the blade mounting groove, so that when the well repairing mill shoe is connected to power equipment, torque can be conveniently and directly transmitted to the blade through the joint; in addition, the blade is assembled on the joint through the pin shaft, so that the blade can be prevented from being separated from the blade mounting groove.
Furthermore, the milling shoe body is provided with a matching groove matched with the blade, the axis direction of the milling shoe body is defined to be the vertical direction, the groove bottom of the matching groove inclines outwards from top to bottom, and when the joint moves relative to the milling shoe body along the vertical direction, the blade moves along the groove bottom of the matching groove to realize the relative external swing of the milling shoe body.
Has the advantages that: the matching groove can play a certain guiding role in the outward swinging of the blade, so that the swinging speed of the blade is uniform, and the blade is protected.
Further, the joint is including the tubular column linkage segment and the direction cooperation section that link together, and the external diameter of tubular column linkage segment is greater than the external diameter of direction cooperation section, is equipped with the tubular column connecting hole that is used for being connected with the tubular column on the tubular column linkage segment, the blade mounting groove sets up on the tubular column linkage segment, is equipped with on the mill shoe body and removes complex guiding hole with direction cooperation section direction.
Has the advantages that: the joint adopts the reducing structure, and on the one hand, the installation of blade of being convenient for, on the other hand can save material.
Furthermore, the tubular column connecting section is provided with a mounting hole extending along the axial direction of the tubular column connecting section, the mounting hole is communicated with the blade mounting groove, a spring for applying elastic force to the blade is arranged in the mounting hole, and the action point of the spring on the blade is positioned on the radial outer side of the pin shaft matched with the corresponding blade.
Has the advantages that: when the reducing mill shoe for well repair is taken out from the underground casing, the blade can be forced to be retracted under the action of the spring and the pin shaft, so that the reducing mill shoe for well repair can be taken out from the underground casing.
Furthermore, a pin shaft through hole for the pin shaft to penetrate through is a long hole extending along the length direction of the blade.
Has the advantages that: when the blade contacts with the hard particle precipitate in the sleeve for the first time, continue to transfer the reducing mill shoe for workover, under the effect of slot hole, the blade has the displacement towards blade mounting groove tank bottom to reduce the clearance between blade and the tubular column linkage segment, the maximize passes through the tubular column linkage segment to the blade transmission moment of torsion, avoids passing through round pin axial blade transmission moment of torsion and probably damages the round pin axle.
Furthermore, an elastic piece is arranged in the guide hole, one end of the elastic piece is fixed in the guide hole, and the other end of the elastic piece is pressed against the guide matching section to drive the guide matching section to move upwards so as to retract the blade.
Has the advantages that: when the pipe column is lifted up, the joint is driven to move reversely relative to the milling shoe body under the action of the elastic force of the elastic piece, so that the blade can be retracted more conveniently, and the whole reducing milling shoe for well repair can be taken out from the underground casing conveniently.
Furthermore, a radial through groove communicated with the guide hole is formed in the radial direction of the shoe grinding body, a stopping piece is arranged in the radial through groove and used for stopping the guide matching section when the guide matching section moves upwards to a set position along the axial direction of the shoe grinding body so as to prevent the guide matching section from being separated from the guide hole.
Has the advantages that: simple structure can avoid the separation of joint and the mill shoe body in the use.
Further, the blade is provided with two blades and is symmetrically arranged along the axis of the joint.
Has the advantages that: the use quantity of blade is reduced, reaches better grinding effect, in addition, need not to set up the cooperation structure of blade on the mill shoes body to guarantee the structural strength of mill shoes body.
The technical scheme of the pipe column assembly is as follows:
the tubular column subassembly includes tubular column and connects at the reducing mill shoe for the workover of tubular column one end, and the reducing mill shoe for the workover includes:
grinding the shoe body;
the joint is used for connecting the pipe column, is in anti-rotation fit with the milling shoe body and can move in a guiding way relative to the milling shoe body in the axial direction of the milling shoe body;
and the blade is assembled on the joint and swings relative to the outer part of the shoe body when the joint moves downwards relative to the shoe body.
The beneficial effects of the pipe column assembly are as follows: when the pipe column assembly is used, the joint of the reducing milling shoe for well repair is connected with the pipe column, then the pipe column is placed in a casing pipe in the well, when the milling shoe body contacts hard particle precipitates in the casing pipe, the pipe column is continuously placed, under the action of bit pressure, the joint moves along the axial direction of the milling shoe body, the blade moves along with the joint, in the moving process, the blade swings outwards relative to the milling shoe body, namely the blade expands outwards, and the range of the blade capable of being cut is enlarged. The diameter-variable milling shoe for well repair increases the grinding diameter through the outward swinging of the blade, further increases the grinding range, and can remove particle sediments in the lower large-diameter casing part of the underground casing with small upper inner diameter and large lower inner diameter, thereby reducing the formation of annular residues and avoiding the occurrence of the condition that a pipe column is stuck and an oil-water well is scrapped.
Furthermore, a blade mounting groove is formed in the joint, a pin shaft is arranged in the blade mounting groove, and the blade is assembled on the joint through the pin shaft.
Has the advantages that: the joint is provided with a blade mounting groove, and the blade is mounted in the blade mounting groove, so that when the well repairing mill shoe is connected to power equipment, torque can be conveniently and directly transmitted to the blade through the joint; in addition, the blade is assembled on the joint through the pin shaft, so that the blade can be prevented from being separated from the blade mounting groove.
Furthermore, the milling shoe body is provided with a matching groove matched with the blade, the axis direction of the milling shoe body is defined to be the vertical direction, the groove bottom of the matching groove inclines outwards from top to bottom, and when the joint moves relative to the milling shoe body along the vertical direction, the blade moves along the groove bottom of the matching groove to realize the relative external swing of the milling shoe body.
Has the advantages that: the matching groove can play a certain guiding role in the outward swinging of the blade, so that the swinging speed of the blade is uniform, and the blade is protected.
Further, the joint is including the tubular column linkage segment and the direction cooperation section that link together, and the external diameter of tubular column linkage segment is greater than the external diameter of direction cooperation section, is equipped with the tubular column connecting hole that is used for being connected with the tubular column on the tubular column linkage segment, the blade mounting groove sets up on the tubular column linkage segment, is equipped with on the mill shoe body and removes complex guiding hole with direction cooperation section direction.
Has the advantages that: the joint adopts the reducing structure, and on the one hand, the installation of blade of being convenient for, on the other hand can save material.
Furthermore, the tubular column connecting section is provided with a mounting hole extending along the axial direction of the tubular column connecting section, the mounting hole is communicated with the blade mounting groove, a spring for applying elastic force to the blade is arranged in the mounting hole, and the action point of the spring on the blade is positioned on the radial outer side of the pin shaft matched with the corresponding blade.
Has the advantages that: when the reducing mill shoe for well repair is taken out from the underground casing, the blade can be forced to be retracted under the action of the spring and the pin shaft, so that the reducing mill shoe for well repair can be taken out from the underground casing.
Furthermore, a pin shaft through hole for the pin shaft to penetrate through is a long hole extending along the length direction of the blade.
Has the advantages that: when the blade contacts with the hard particle precipitate in the sleeve for the first time, continue to transfer the reducing mill shoe for workover, under the effect of slot hole, the blade has the displacement towards blade mounting groove tank bottom to reduce the clearance between blade and the tubular column linkage segment, the maximize passes through the tubular column linkage segment to the blade transmission moment of torsion, avoids passing through round pin axial blade transmission moment of torsion and probably damages the round pin axle.
Furthermore, an elastic piece is arranged in the guide hole, one end of the elastic piece is fixed in the guide hole, and the other end of the elastic piece is pressed against the guide matching section to drive the guide matching section to move upwards so as to retract the blade.
Has the advantages that: when the pipe column is lifted up, the joint is driven to move reversely relative to the milling shoe body under the action of the elastic force of the elastic piece, so that the blade can be retracted more conveniently, and the whole reducing milling shoe for well repair can be taken out from the underground casing conveniently.
Furthermore, a radial through groove communicated with the guide hole is formed in the radial direction of the shoe grinding body, a stopping piece is arranged in the radial through groove and used for stopping the guide matching section when the guide matching section moves upwards to a set position along the axial direction of the shoe grinding body so as to prevent the guide matching section from being separated from the guide hole.
Has the advantages that: simple structure can avoid the separation of joint and the mill shoe body in the use.
Further, the blade is provided with two blades and is symmetrically arranged along the axis of the joint.
Has the advantages that: the use quantity of blade is reduced, reaches better grinding effect, in addition, need not to set up the cooperation structure of blade on the mill shoes body to guarantee the structural strength of mill shoes body.
Drawings
FIG. 1 is an exploded view of the construction of example 1 of the variable diameter milling shoe for well repair according to the present invention;
FIG. 2 is a schematic view showing the overall structure of one of the angles of embodiment 1 of the variable diameter milling shoe for well repair according to the present invention;
FIG. 3 is a schematic view showing another angle of the overall structure of the variable diameter milling shoe for well repair of the present invention in accordance with embodiment 1;
FIG. 4 is a cross-sectional view of a normal state of example 1 of the variable diameter milling shoe for well intervention of the present invention (without showing the blades);
FIG. 5 is a cross-sectional view of a normal state of example 1 of the variable diameter milling shoe for well intervention of the present invention (showing the blades);
FIG. 6 is a schematic view of the overall structure of the working state of embodiment 1 of the variable diameter milling shoe for well repair according to the present invention;
FIG. 7 is a cross-sectional view showing the operation state of embodiment 1 of the variable diameter milling shoe for well repair according to the present invention.
Description of reference numerals:
1-joint, 2-shoe body, 3-blade, 4-column connecting section, 5-guide matching section, 6-guide hole, 7-pin shaft, 8-screw, 9-blade mounting groove, 10-elastic member, 11-pressure spring, 12-thimble, 13-column connecting hole, 14-stopping member, 15-matching groove, 16-bulge, 17-slot, 18-chamfer, 19-pin shaft perforation, 20-semi-column, 21-radial through groove and 22-mounting hole.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The invention relates to a specific embodiment of a variable diameter milling shoe for well repair, which comprises the following components in percentage by weight:
the diameter-variable mill shoe for well repair is suitable for a downhole casing with a small upper diameter and a large lower diameter. As shown in fig. 1 to 5, the variable diameter milling shoe for well repair comprises a joint 1, a blade 3 and a milling shoe body 2, wherein the joint 1 and the milling shoe body 2 are both cylindrical, the blade 3 is in a strip plate shape, the blade 3 can be assembled on the joint 1 in a swinging manner relative to the milling shoe body, and the joint 1 and the milling shoe body 2 are in stop-rotation fit in the axial direction of the milling shoe body 2 and can move in a guiding manner relative to the milling shoe body 2. The axial direction of the milling shoe body 2 is defined as the vertical direction, and the lower end of the milling shoe body 2 and the blade 3 are both provided with hard alloy bodies for grinding particle sediments in the downhole casing.
As shown in fig. 1, 2 and 3, the joint 1 includes two parts, namely a pipe column connecting section 4 and a guiding and matching section 5 which are connected with each other, wherein the outer diameter of the pipe column connecting section 4 is larger than that of the guiding and matching section 5. The pipe column connecting section 4 is used for connecting a pipe column, and is provided with a pipe column connecting hole 13 with an internal thread section; the guide matching section 5 is matched with the milling shoe body 2 in a guide and movable manner in the axial direction of the milling shoe body 2, and is provided with a through hole coaxial with the pipe column connecting hole 13. The shoe grinding body 2 is provided with a guide hole 6 which is movably matched with the guide matching section in a guide way, and the axis of the guide hole 6 is superposed with the axis of the pipe column connecting hole 13.
Be equipped with two slots 17 along tubular column linkage segment axis symmetric arrangement in the circumference of tubular column linkage segment 4, be equipped with outside convex arch 16 in the circumference of the mill shoes body 2, when direction cooperation section 5 removed a certain position along the direction of guiding hole 6, protruding 16 can be pegged graft with slot 17 and cooperate. In this embodiment, the end of the guiding matching section 5 far from the pipe column connecting section 4 is fixedly connected with two half cylinders 20, the two half cylinders 20 are symmetrical about the axis of the guiding matching section 5, and the two half cylinders and the guiding matching section 5 move together along the guiding hole 6 in a guiding manner. The side of the protrusion 16 is provided with a radial through groove 21, the radial through groove 21 is communicated with the guide hole 6, the stop member 14 extending into the guide hole 6 is arranged in the radial through groove 21, the stop member 14 is a fixed block, and the stop member 14 stops the semi-cylindrical column 20 when the guide matching section moves upwards to a set position along the axial direction of the shoe grinding body so as to prevent the guide matching section 5 from being pulled out of the guide hole 6. The fixing block is provided with an arc-shaped clamping part matched with the shape of the circumferential surface of the guide matching section 5, the bulge 16 is provided with a thread mounting hole which is communicated with the radial through groove 21 and the axis of which extends along the axial direction of the milling shoe body 2, and the stopping piece 14 is provided with a through hole which is coaxial with the thread mounting hole. Two stop 14 penetrate corresponding radial through groove 21 respectively in the radial both sides of the mill shoe body 2 and chucking direction cooperation section 5, then will lead cooperation section and mill shoe body 2 anticreep cooperation through wearing the screw 8 of dress in screw thread mounting hole, through-hole and mill shoe body 2 simultaneously to can prevent in the use that whole joint 1 from deviating from the mill shoe body 2.
The circumference of the pipe column connecting section 4 is provided with two blade mounting grooves 9, the two blade mounting grooves 9 are symmetrically arranged about the axis of the pipe column connecting section 4, the blades 3 can be assembled on the pipe column connecting section 4 through corresponding pin shafts 7 penetrating the blade mounting grooves 9 in a swinging mode, the blades 3 are provided with pin shaft through holes 19, and the blades 3 can swing relative to the pin shafts. When the blade 3 is mounted in the blade mounting groove 9, both sides of the blade 3 are closely attached to both side groove walls of the blade mounting groove 9, but a certain gap is formed between the end of the blade 3 and the bottom of the blade mounting groove 9.
The circumference of the shoe grinding body 2 is provided with a matching groove 15 matched with the blade, the groove bottom of the matching groove 15 inclines outwards from top to bottom, the groove bottom of the matching groove 15 extends to the circumferential surface of the shoe grinding body, and the blade 3 is provided with a chamfer 18 attached to the groove bottom of the matching groove 15. When the joint 1 moves along the axial direction of the milling shoe body 2, the blade 3 is driven to move along the extension direction of the groove bottom of the matching groove 15, and in the moving process of the blade 3, the blade 3 swings relative to the milling shoe body 2, which is equivalent to phase change and increase of the grinding diameter of the milling shoe body 2, namely, the grinding range is enlarged.
In order to prevent the pin shaft 7 from being damaged by the torque transmitted through the power unit and the circulating device during grinding, the pin shaft through hole 19 of the blade 3 is formed in a long hole structure extending in the length direction of the blade. In addition, a mounting hole 22 extending along the axial direction of the pipe column connecting section 4 is further formed in the pipe column connecting section 4, the mounting hole 22 is communicated with the blade mounting groove 9, a spring for applying elastic force to the blade is arranged in the mounting hole 22, in the embodiment, the spring is a compression spring 11, an ejector pin 12 is further arranged in the mounting hole 22, one end of the compression spring 11 presses the pipe column connecting section 4, one end of the compression spring presses the ejector pin 12, and the elastic force is applied to the blade 3 through the ejector pin 12. The action point of the pressure spring 11 on the blade 3 through the thimble 12 is located at the radial outer side of the pin matched with the blade, so that when the variable diameter milling shoe for well repair is taken out from the underground casing, the blade is forcibly retracted under the action of the pressure spring and the pin, and the blade can be smoothly taken out from the underground casing.
An elastic part 10 is arranged in the guide hole 6, one end of the elastic part 10 is fixed on the guide hole 6, the other end of the elastic part 10 is pressed against the guide matching section 5, and in the process of extracting the tubular column, the elastic force applied to the guide matching section 5 by the elastic part 10 drives the guide matching section to move reversely, so that the blade 5 is driven to retract. In this embodiment, the elastic member 10 is a coil spring.
The working principle of the reducing mill shoe for well repair of the invention is as follows: as shown in fig. 6 and 7, firstly, selecting a proper size of the milling shoe body 2 according to the inner diameter of the upper part of the underground casing pipe, connecting the joint 1 to the lower end of the pipe column, and integrally lowering the milling shoe body 2 into the underground casing pipe along with the pipe column, continuing lowering the pipe column after the milling shoe body 2 contacts the hard particle sediment in the casing pipe, under the action of bit pressure, compressing the elastic part 10 by the guide matching section 5 to move downwards, and simultaneously driving the blade 3 to move downwards and extend out along the bottom of the matching groove 15 on the milling shoe body 2 until the slot 17 on the pipe column connecting section contacts with the bulge 16 on the milling shoe body 2; at the moment, the blade 3 extends to the maximum, namely the grinding diameter reaches the maximum, the joint 1 transmits torque through the slot 17 and the bulge 16 on the milling shoe body 2 through a ground or underground power device and circulating equipment, and the milling shoe body 2 firstly carries out drilling and removing on hard particle sediments in the sleeve. When the blade 3 contacts with the hard particle sediment in the casing, the pipe column is continuously lowered to drill, the blade 3 firstly compresses the compression spring 11 through the thimble 12 to move upwards until the blade 3 contacts with the bottom of the blade mounting groove 9, the pipe column is continuously lowered to drill, and the blade 3 can clean the residual cement sheath on the inner wall of the casing. After cleaning, the pipe column is lifted, the joint 1 and the milling shoe body 2 generate relative displacement under the action of the elastic part 10, and the blade 3 moves upwards along the bottom of the matching groove; meanwhile, the blade 3 is forcibly retracted under the action of the pressure spring 11 and the thimble 12, and is restored to the initial state, and finally, the whole body smoothly passes through the upper part of the sleeve.
Specific example 2 of the variable diameter mill shoe for well repair:
in this embodiment, the side of the blade close to the guide matching section is an inclined plane inclined from top to bottom to the outside, in an initial state, the end of the shoe grinding body abuts against the inclined plane of the blade, and when the joint moves along the axial direction close to the shoe grinding body, the shoe grinding body abuts against the blade to enable the blade to swing outwards relative to the shoe grinding body, so that particle precipitates are removed from the part of the sleeve with the inner diameter larger than the outer diameter of the shoe grinding body. Other structures of the variable-diameter milling shoe for well repair in the embodiment are the same as the corresponding structures of the variable-diameter milling shoe for well repair in the embodiment 1, and are not described again.
Specific example 3 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the through hole of the pin shaft on the blade is not a long hole but a round hole matched with the size of the pin shaft, at the moment, the power device and the circulating equipment transmit the torque to the blade through the pin shaft, and the pin shaft made of high-strength materials is adopted to avoid the damage of the pin shaft. Thus, a pressure spring and an ejector pin are not needed.
Specific example 4 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the joint adopts the equal-diameter section, but the external diameter of the joint is less than the external diameter of the grinding shoe body, at the moment, the blade is hinged on the peripheral surface of the joint through the hinge seat, when the joint moves along the axial direction, the blade still moves along the direction of the groove bottom of the matching groove on the grinding shoe body, and the power device and the circulating equipment transmit the torque to the blade through the hinge seat.
Specific example 5 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the elastic part is not arranged in the guide hole, so that the blade is retracted by the gravity of the shoe grinding body when the pipe column is lifted up.
Specific example 6 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the thimble and the spring are not installed on the tubular column connecting section, but a lead wire perforation is arranged, the lead wire perforation is communicated with the blade mounting groove, and the lead wire is fixedly connected with the blade.
Specific example 7 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the blade is not provided with the chamfer, and when the blade is driven to move by the connector, the edge of the blade is easily scratched on the bottom of the matching groove, and the edge of the blade contacting with the bottom of the matching groove is easily abraded without influencing the normal use of the blade.
Specific example 8 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the blade evenly sets up three or more than four along the circumference that connects, is equipped with the cooperation groove that corresponds with blade quantity on the body of the mill shoe, for the structural strength who guarantees the body of the mill shoe, can use the body of the mill shoe that high strength material supported.
Specific example 9 of the variable diameter mill shoe for well repair:
this embodiment differs from embodiment 1 described above in that: the guide hole is a variable diameter hole and comprises a small-diameter hole section with a smaller diameter for the guide matching section (not including a semi-cylinder) to pass through and a large-diameter hole section with a diameter larger than that of the small-diameter hole section, and a stop step in stop matching with the guide matching section is formed between the small-diameter hole section and the large-diameter hole section, so that a stop part does not need to be arranged. In order to facilitate the assembly of the joint and the milling shoe body, the pipe column connecting section and the guide matching section of the joint can be arranged in a split mode, the guide matching section and the semi-cylinder on the guide matching section penetrate into the large-diameter hole section of the guide hole from the lower portion of the milling shoe body, the guide matching section penetrates out of the small-diameter hole section, then one end, extending out of the guide hole, of the guide matching section is welded with the pipe column connecting section, and therefore the joint is prevented from being separated from the milling shoe body.
Specific embodiments of the tubing string assembly of the present invention:
the tubular column subassembly includes tubular column and connects the reducing mill shoe for workover that connects at the tubular column lower extreme, and the structure of the reducing mill shoe for workover is the same with the structure of the reducing mill shoe for workover in above-mentioned embodiment, and it is no longer repeated here.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. Well workover is with reducing mill shoe, its characterized in that includes:
grinding the shoe body;
the joint is used for connecting the pipe column, is in anti-rotation fit with the milling shoe body and can move in a guiding way relative to the milling shoe body in the axial direction of the milling shoe body;
and the blade is assembled on the joint and swings relative to the outer part of the shoe body when the joint moves downwards relative to the shoe body.
2. The variable diameter mill shoe for well repair according to claim 1, wherein the joint is provided with a blade mounting groove, a pin is provided in the blade mounting groove, and the blade is assembled to the joint through the pin.
3. The variable diameter mill shoe for well repair according to claim 1, wherein the mill shoe body is provided with a fitting groove for fitting the blade, the axial direction of the mill shoe body is defined as an up-down direction, a groove bottom of the fitting groove is inclined outward from up to down, and when the joint moves in the up-down direction relative to the mill shoe body, the blade moves along the groove bottom of the fitting groove to swing outward relative to the mill shoe body.
4. The variable-diameter mill shoe for well repair according to claim 2 or 3, wherein the joint comprises a pipe column connecting section and a guide matching section which are connected together, the outer diameter of the pipe column connecting section is larger than that of the guide matching section, a pipe column connecting hole for being connected with a pipe column is formed in the pipe column connecting section, the blade mounting groove is formed in the pipe column connecting section, and a guide hole which is matched with the guide matching section in a guide moving mode is formed in the mill shoe body.
5. The variable-diameter mill shoe for well repair according to claim 4, wherein the pipe column connecting section is provided with a mounting hole extending along the axial direction thereof, the mounting hole is communicated with the blade mounting groove, a spring for applying elastic force to the blade is arranged in the mounting hole, and the acting point of the spring on the blade is positioned at the radial outer side of the pin shaft matched with the corresponding blade.
6. The variable diameter mill shoe for well repair according to claim 2 or 3, wherein the pin hole of the blade through which the pin passes is a long hole extending in the length direction of the blade.
7. The variable diameter mill shoe for well repair as claimed in claim 4, wherein an elastic member is provided in the guide hole, one end of the elastic member is fixed in the guide hole, and the other end of the elastic member presses the guide engaging section to drive the guide engaging section to move upward to retract the blade.
8. The variable diameter milling shoe for well repair according to claim 4, wherein the milling shoe body is provided with a radial through groove in a radial direction, the radial through groove being provided with a stopper for stopping the guide engagement section when the guide engagement section moves upward to a set position along the axial direction of the milling shoe body, so as to prevent the guide engagement section from being removed from the guide hole.
9. The variable diameter mill shoe for well repair according to any one of claims 1 to 3, wherein the number of the blades is two and is symmetrically arranged along an axis of the joint.
10. A pipe string assembly comprising a pipe string and a variable diameter mill shoe for well repair connected to one end of the pipe string, wherein the variable diameter mill shoe for well repair is the variable diameter mill shoe for well repair according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495495.5A CN111648736B (en) | 2020-06-03 | 2020-06-03 | Reducing mill shoe for well repair and tubular column assembly using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495495.5A CN111648736B (en) | 2020-06-03 | 2020-06-03 | Reducing mill shoe for well repair and tubular column assembly using same |
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| Publication Number | Publication Date |
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| CN111648736A true CN111648736A (en) | 2020-09-11 |
| CN111648736B CN111648736B (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115628027A (en) * | 2022-12-19 | 2023-01-20 | 四川康克石油科技有限公司 | Mechanical external cutting tool for oil pipe |
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| Publication number | Publication date |
|---|---|
| CN111648736B (en) | 2023-05-12 |
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