CN109882126B - Variable diameter pipe scraper - Google Patents
Variable diameter pipe scraper Download PDFInfo
- Publication number
- CN109882126B CN109882126B CN201910247041.3A CN201910247041A CN109882126B CN 109882126 B CN109882126 B CN 109882126B CN 201910247041 A CN201910247041 A CN 201910247041A CN 109882126 B CN109882126 B CN 109882126B
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- teeth
- core tube
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- 238000003825 pressing Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 15
- 238000004033 diameter control Methods 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 9
- 239000003129 oil well Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- 239000012188 paraffin wax Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
Landscapes
- Cleaning In General (AREA)
- Actuator (AREA)
Abstract
The invention relates to a pipe scraper, in particular to a variable-diameter pipe scraper. The variable-diameter pipe scraper consists of an upper joint, an outer cylinder, a piston ring, a driving cylinder, an I-shaped ring, a pushing block and a scraper: the lower end of the upper joint is connected with an outer cylinder through threads; the outer cylinder is fixedly provided with a core tube through a connecting ring; the upper end of the core tube is fixedly and hermetically connected with the outer cylinder through a core tube cap; the outer cylinder outside the core pipe is fixedly provided with a reducing control cylinder; a pressing cylinder is slidably arranged in the reducing control cylinder through a spline groove; the upper end of the pressing cylinder is fixedly provided with a piston ring; a driving cylinder is movably arranged below the reducing control cylinder; an I-shaped ring is movably arranged below the driving cylinder through a return spring; a plurality of pushing blocks are uniformly and fixedly arranged on the circumferential surface of the I-shaped ring; the outer cylinder on the outer side of the push block is provided with a scraper in a sliding manner through a limiting guide block. The scraper solves the problems of complex operation procedures and low cleaning efficiency existing in the process of cleaning a shaft by the existing scraper, and meets the production and use requirements of enterprises.
Description
Technical Field
The invention relates to a pipe scraper, in particular to a variable-diameter pipe scraper.
Background
The crude oil contains paraffin, the carbon atoms in the paraffin can change along with the temperature change in the exploitation process, crystals are accumulated and gradually increased, and the crystals are deposited on the inner wall of a shaft, so that the phenomenon of paraffin precipitation of an oil well occurs. The wax deposition of the oil well can affect the lifting flow cross section of the high-pressure liquid, increase the flow resistance of the high-pressure liquid, affect the normal operation of oil well equipment, reduce the oil well yield, reduce the oil extraction rate, even directly block the oil pipe, and cause the problem of oil well production stoppage. Well waxing is one of the main causes of increased oil recovery costs in the oil field. At present, a mechanical scraping pipe mode is often adopted to finish the cleaning work of the inner wall of a shaft. However, the petroleum oil well has the characteristic that the diameter of the well shaft is thinner and thinner along with the increase of the depth of the oil well, namely the characteristic that the inner diameters of all well shafts in the same oil well are inconsistent; the existing pipe scraping device has the characteristic that the fixed-pipe-diameter shaft can only be cleaned due to the limitation of structural reasons, so that the cleaning work of the shaft can be completed by the paraffin removal devices of the same oil well with various types, and the cleaning work of the next shaft can be continued after the paraffin removal device of one type completes the cleaning work of one section of shaft and is replaced after the paraffin removal device of one type is discharged from the shaft, and the problems of complex operation procedure and low cleaning efficiency are solved; therefore, it is necessary to develop a variable diameter pipe scraper, so that the variable diameter pipe scraper can complete cleaning work of shafts with different diameters in the same oil well, so as to solve the problems existing in the conventional paraffin removal device.
Disclosure of Invention
The invention aims at: the variable-diameter pipe scraper is compact in structure and ingenious in design, and solves the problems of complex operation procedures and low cleaning efficiency existing in the process of cleaning a shaft by the conventional paraffin removal device.
The technical scheme of the invention is as follows:
the utility model provides a variable diameter scraper, it comprises top connection, urceolus, piston ring, core pipe cap, reducing control section of thick bamboo, pressure section of thick bamboo, actuating cylinder, worker's shape ring, ejector pad and scraper; the method is characterized in that: the lower end of the upper joint is connected with an outer cylinder through threads; the outer cylinder is fixedly provided with a core tube through a connecting ring; the upper end of the core tube is fixedly and hermetically connected with the outer cylinder through a core tube cap; the outer cylinder outside the core pipe is fixedly provided with a reducing control cylinder; a pressing cylinder is slidably arranged in the reducing control cylinder through a spline groove; the upper end of the pressing cylinder extends to the upper part of the reducing control cylinder and is fixedly provided with a piston ring; the piston ring is in sliding sealing connection with the outer cylinder and the core tube; a driving cylinder is movably arranged below the reducing control cylinder; the driving cylinder is in intermittent abutting connection with the variable-diameter control cylinder and the pressing cylinder respectively; an I-shaped ring is movably arranged below the driving cylinder through a return spring; the I-shaped ring is in abutting connection with the driving cylinder; a plurality of pushing blocks are uniformly and fixedly arranged on the circumferential surface of the I-shaped ring; the outer cylinder on the outer side of the push block is provided with a scraper in a sliding way through a limiting guide block; the pushing block is connected with the corresponding scraper in a sliding clamping way.
The core pipe cap is in a ring shape, and a sealing conical surface is arranged on the inner side of the core pipe cap; a plurality of liquid flow through holes are uniformly distributed in the core pipe cap; the annulus between the core tube and the outer cylinder is communicated with the upper joint through a liquid flow hole.
A plurality of adjusting gears are uniformly distributed on the end face of the lower end of the reducing control cylinder; the adjusting gear consists of a plurality of gear adjusting teeth; the gear adjusting teeth in the same adjusting gear are of a ladder-shaped structure; the gear adjusting teeth are of an inclined structure; the diameter-changing control cylinder is internally provided with a spline groove, and the diameter-changing control cylinder is slidably provided with a pressing cylinder through the spline groove.
Spline teeth are arranged on the circumferential surface of the pressing cylinder; the spline teeth are in sliding connection with spline grooves in the variable-diameter control cylinder; a plurality of pushing teeth are arranged on the end face of the lower end of the pressing cylinder at intervals; the pushing teeth are isosceles triangles, and the top ends of the pushing teeth are arc-shaped.
The driving cylinder is a stepped cylinder; the thin end part of the driving cylinder extends into the pressing cylinder and is connected with the pressing cylinder in a sliding way; a plurality of driving strips are uniformly distributed on the circumferential surface of the thick end part of the driving cylinder; the upper end face of the driving bar is provided with a driving inclined plane; the driving inclined plane is opposite to the pushing tooth of the pressing cylinder and the gear adjusting tooth of the reducing control cylinder, and is in intermittent abutting connection.
The driving inclined plane is consistent with the inclined shape and the width of the gear adjusting teeth of the variable-diameter control cylinder; the end points of the two ends of the gear adjusting teeth are positioned on the same straight line with the demarcation point of the pushing teeth on the pressing cylinder.
The outer cylinder is provided with a shearing pin; the upper end of the core tube is provided with a bypass hole; when the piston ring is in an initial state, the piston ring is in abutting connection with the core pipe cap and the shear pin and is in sealing connection with the bypass hole.
One side of the pushing block is obliquely provided with a T-shaped sliding rail; the pushing block is connected with the corresponding scraper in a sliding and clamping manner through a T-shaped sliding rail.
The invention has the advantages that:
the variable-diameter pipe scraper is compact in structure and ingenious in design, and the extending length of the scraper can be changed in a pressing mode, so that the variable-diameter pipe scraper can adapt to cleaning work of shafts with different diameters, the problems of complex operation procedures and low cleaning efficiency existing in the process of cleaning the shafts by the existing pipe scraper are solved, and the production and use requirements of enterprises are met.
Drawings
FIG. 1 is a schematic diagram of a front view of the present invention;
FIG. 2 is an enlarged schematic view of the structure shown at A in FIG. 1;
FIG. 3 is a schematic view of the diameter-variable control cylinder according to the present invention;
FIG. 4 is a schematic view of a press cylinder according to the present invention;
FIG. 5 is a schematic view of a driving cylinder according to the present invention;
FIG. 6 is a schematic diagram of a push block according to the present invention;
FIG. 7 is a schematic view of the working state structure of the present invention;
FIG. 8 is an enlarged schematic view of the structure shown at B in FIG. 7;
FIG. 9 is a schematic view of a downward movement track of a platen according to the present invention;
FIG. 10 is an enlarged schematic view of FIG. 9C;
FIG. 11 is an enlarged schematic view of the structure of FIG. 9 at D;
FIG. 12 is a schematic view of the upward movement path of the platen of the present invention;
fig. 13 is an enlarged schematic view of the structure at E in fig. 12.
In the figure: 1. the device comprises an upper joint, 2, an outer cylinder, 3, a piston ring, 4, a core tube, 5, a core tube cap, 6, a diameter-changing control cylinder, 7, a pressing cylinder, 8, a driving cylinder, 9, an I-shaped ring, 10, a push block, 11, a scraper, 12, a sealing conical surface, 13, a liquid flow through hole, 14, a shearing pin, 15, a bypass hole, 16, a return spring, 17, a T-shaped sliding rail, 18, a limiting guide block, 19, an adjusting gear, 20, a gear adjusting tooth, 21, spline teeth, 22, push teeth, 23, a driving bar, 24, a driving inclined surface, 25 and a sealing ball.
Detailed Description
The variable-diameter pipe scraper consists of an upper joint 1, an outer cylinder 2, a piston ring 3, a core pipe 4, a core pipe cap 5, a variable-diameter control cylinder 6, a pressing cylinder 7, a driving cylinder 8, an I-shaped ring 9, a push block 10 and a scraper 11 (see figure 1 in the specification).
The lower end of the upper joint 1 is connected with an outer cylinder 2 through threads; the core tube 4 is fixedly arranged in the outer cylinder 2 through a connecting ring 12; the upper end of the core tube 4 is fixedly and hermetically connected with the outer cylinder 2 through a core tube cap 5 (see figure 1 of the specification).
The core tube cap 5 is in a ring shape, and a sealing conical surface 12 is arranged on the inner side of the core tube cap 5; a plurality of liquid flow holes 13 are uniformly distributed in the core pipe cap 5; the annulus between the core tube 4 and the outer barrel 2 communicates with the upper fitting 1 through a flow through bore 13 (see figure 2 of the specification). The purpose of this arrangement is that: after the ball throwing operation is performed to the inside of the scraper in the working process, the sealing ball 25 can seal the core pipe cap 5 through the sealing conical surface 12 (see fig. 7 of the specification), so that the drilling fluid can only enter the annular space of the core pipe 4 and the outer cylinder 2 through the fluid flow holes 13 in the pressurizing process of injecting the drilling fluid into the scraper, and the piston ring 3 is driven to act, thereby achieving the purpose of controlling the movement of the scraper.
The outer cylinder 2 outside the core tube 4 is fixedly provided with a reducing control cylinder 6 (see figure 1 of the specification); a plurality of adjusting gears 19 (see figure 3 of the specification) are uniformly distributed on the end surface of the lower end of the reducing control cylinder 6; the adjusting gear 19 is composed of a plurality of gear adjusting teeth 20; the gear adjusting teeth 20 in the same adjusting gear 19 are in a ladder-shaped structure; the gear adjusting teeth 20 are of an inclined structure; the diameter-variable control cylinder 6 is internally provided with a spline groove, and the diameter-variable control cylinder 6 is slidably provided with a pressing cylinder 7 through the spline groove (see fig. 1 of the specification).
The upper end of the pressing cylinder 7 extends to the upper part of the reducing control cylinder 6 and is fixedly provided with a piston ring 3; the piston ring 3 is in sliding sealing connection with the outer cylinder 2 and the core tube 4; so that the piston ring 3 moves synchronously with the movable pressure cylinder 7 when it is pressed.
Spline teeth 21 are arranged on the circumferential surface of the pressing cylinder 7 (see fig. 4 in the specification); the spline teeth 21 are in sliding connection with spline grooves in the diameter-variable control cylinder 6; the purpose of the platen 7 is to: so that the pressing cylinder 7 can only move up and down along the reducing control cylinder 6 under the guidance of the spline teeth 21; but cannot make a rotational movement.
A plurality of pushing teeth 22 (see fig. 4 of the specification) are arranged on the lower end face of the pressing cylinder 7 at intervals; the pushing teeth 22 are isosceles triangles, and the top ends of the pushing teeth 22 are arc-shaped. Because the pushing teeth 22 need to push the driving cylinder 8 to act through the top ends thereof in the working process, the top ends of the pushing teeth 22 can generate relative friction with the driving cylinder 8; therefore, when the top end of the pushing tooth 22 is designed to be arc-shaped, friction resistance can be effectively reduced, energy consumption is reduced, and the problem of 'latch' between the pushing tooth 22 and the driving cylinder 8 when the top end is in other shapes is avoided.
A driving cylinder 8 (see figure 1 of the specification) is movably arranged below the reducing control cylinder 6; the driving cylinder 8 can move up and down in the outer cylinder 2 when being stressed, and can also perform rotary motion. An I-shaped ring 9 is movably arranged below the driving cylinder 8 through a return spring 16 (see figure 1 of the specification); under the action of the spring force of the return spring 16, the i-shaped ring 9 always has a tendency to move upwards, so that the i-shaped ring 9 is always in abutting connection with the drive cylinder 8.
The driving cylinder 8 is a stepped cylinder (see fig. 5 of the specification); the thin end portion of the driving cylinder 8 is extended to the inside of the pressing cylinder 7 and is slidably connected thereto (see fig. 8 of the specification).
A plurality of driving bars 23 are uniformly distributed on the circumferential surface of the thick end part of the driving cylinder 8 (see fig. 5 of the specification); the upper end face of the driving bar 23 is provided with a driving inclined plane 24; the driving inclined plane 24 is opposite to the pushing tooth 22 of the pressing cylinder 7 and the gear adjusting tooth 20 of the reducing control cylinder 6, and is in intermittent abutting connection.
The driving inclined surface 24 is consistent with the inclined shape and the width of the gear position adjusting teeth 20 of the reducing control cylinder 6 (see fig. 9 of the specification); the purpose of this arrangement is that: so that when the driving bar 23 is abutted against the gear adjusting teeth 20, the driving inclined surface 24 of the driving bar 23 can be in fit connection with the gear adjusting teeth 20.
The end points of the two ends of the gear position adjusting teeth 20 are in the same straight line with the demarcation point of the pushing teeth 22 on the pressure cylinder 7 (see fig. 10 of the specification). The purpose of this arrangement is that: so that the pressing cylinder 7 pushes the driving cylinder 8 to move downwards through the pushing teeth 22 (see fig. 10 of the specification), namely, in the process that the driving bar 23 of the driving cylinder 8 moves downwards along the side edge of the gear adjusting teeth 20, a certain gap exists between the upper end head of the driving inclined surface 24 and the adjacent pushing teeth 22, so that the driving cylinder 8 can smoothly rotate for a certain position after being separated from contact with the gear adjusting teeth 20, and enters the adjacent gear adjusting teeth 20.
A plurality of pushing blocks 10 (see figure 1 of the specification) are uniformly and fixedly arranged on the circumferential surface of the I-shaped ring 9; the outer cylinder 2 outside the push block 10 is slidably provided with a scraper 11 through a limit guide block 18. Under the action of the limit guide block 18, the scraper 11 can only perform radial displacement and cannot perform actions in other directions.
One side of the push block 10 is obliquely provided with a T-shaped slide rail 17; the push block 10 is connected with the corresponding scraper 11 in a sliding and clamping manner through a T-shaped sliding rail 17 (see fig. 5 in the specification). The purpose of the push block 10 and the doctor blade 11 being thus arranged is: so that the pushing block 10 can push the scraper 11 to move radially outwards through the inclined T-shaped sliding rail 17 when in use, thereby achieving the purpose of expanding the scraper 11; when the push block 10 moves upwards, the movable scraper 11 can be pulled to return radially through the T-shaped sliding rail 17, so that the purpose of retracting the scraper 11 is achieved.
The outer cylinder 2 is provided with a shear pin 14; the upper end of the core tube 4 is provided with a bypass hole 15; when the piston ring 3 is in the initial state, it is in abutting connection with the core tube cap 5 and the shear pin 14 and is in sealing connection with the bypass hole 15 (see fig. 2 of the specification). The shear pin 14 is provided for the purpose of: so that the shearing pin 14 can fix and position the piston ring 3 to prevent the piston ring from easily generating action, and further ensure that the scraper can always keep an initial state in the well descending process, thereby ensuring the smooth well descending of the scraper.
When the variable diameter pipe scraper is in an initial state, the lower end of the pressure cylinder 7 is in a separation state with the driving strip 23 of the driving cylinder 8; the driving bar 23 of the driving cylinder 8 is in abutting connection with the gear adjusting teeth 20 positioned at the highest position in the reducing control cylinder 6; doctor blade 11 is in a contracted state (see fig. 1 and 9 of the specification).
When the variable diameter pipe scraper works, firstly, the pipe scraper is lowered into a shaft to be cleaned through a tool string, and then a sealing ball 25 is put into the pipe scraper through the tool string; after the sealing ball 25 enters the inside of the outer cylinder 2 and falls on the core cap 5, the core cap 5 is sealed by the sealing tapered surface 12 (see fig. 7 of the specification).
After the ball is thrown, injecting drilling fluid into the pipe scraper for pressing; the drilling fluid entering the scraper enters the annular space between the core tube 4 and the outer cylinder 2 through the fluid flow hole 13 to extrude the piston ring 3; after the piston ring 3 is pressed and sheared by the shearing pin 14, the dynamic pressure cylinder 7 is driven to synchronously move downwards.
When the pressing cylinder 7 moves downwards to be in contact with the driving bar 23 on the driving cylinder 8, the pressing cylinder 7 presses the driving inclined surface 24 on the driving bar 23 through the pushing teeth 22, so that the driving cylinder 8 is pushed to move downwards continuously; during the downward movement of the drive cylinder 8, the drive bar 23 moves down along the side of the gear position adjusting teeth 20 of the reducing control cylinder 6 (see fig. 10 of the specification).
During the downward movement of the driving bar 23 along the side edge of the gear position adjusting tooth 20, the pushing tooth 22 of the pressing cylinder 7 acts on the driving inclined plane 24 of the driving bar 23, so that the direction of the pushing force of the driving inclined plane 24 by the pushing tooth 22 is vertical to the downward direction of the driving inclined plane 24; at this time, the pushing force is decomposed into a downward vertical component and a horizontal component; the driving bar 23 moves down along the side of the gear adjusting tooth 20 under the action of the vertical component force; while under horizontal forces the drive bar 23 always has a tendency to rotate. Therefore, when the pressure cylinder 7 pushes the driving bar 23 to be separated from the gear adjusting teeth 20 (see fig. 11 of the specification), the driving bar 23 drives the driving cylinder 8 to rotate by a certain angle under the action of horizontal force, and when the upper end point of the driving bar 23 is in interference with the adjacent pushing teeth 22 (the pressure cylinder 7 can only move up and down) (see fig. 11 of the specification), the driving bar 23 and the pushing teeth 22 keep the equilibrium state of force, the pressure cylinder 7 and the driving cylinder 8 keep a relatively stable state, and the driving cylinder 8 moves together with the pressure cylinder 7.
After the pressure cylinder 7 pushes the driving cylinder 8 to completely move below the adjusting gear 19, the drilling fluid is stopped from being injected into the pipe scraper to be pressed, the hydraulic pressure in the outer cylinder 2 is relieved from the bypass hole 15, the hydraulic pressure born by the piston ring 3 disappears, and the driving cylinder 8, the pressure cylinder 7 and the piston ring 3 are pushed to move upwards by the I-shaped ring 9 under the elastic force of the return spring 16.
When the driving cylinder 8 moves up to approach the gear position adjusting teeth 20 of the reducing control cylinder 6, the body part of the driving inclined surface 24 of the driving bar 23 corresponds to the lower end point position of the next gear position adjusting teeth 20 because the driving cylinder 8 rotates by a certain angle during the downward movement (see fig. 3 of the specification); whereby as the drive bar 23 continues to move upwardly, the drive ramp 24 of the drive bar 23 interferes with the lower end of the gear position adjustment tooth 20 (see fig. 3 of the specification); then, during the further upward movement of the driving cylinder 8, the driving bar 23 of the driving cylinder 8 will move upward along the inclined plane of the gear position adjusting tooth 20, i.e. the driving cylinder 8 will also perform a rotational movement during the upward movement.
In the process of upward movement and rotation of the driving cylinder 8, the upper end point of the driving bar 23 drives the pressing cylinder 7 to act together by acting on the pushing teeth 22 of the pressing cylinder 7; since the upper end point of the driving bar 23 acts on the side slope of the push tooth 22 (see fig. 13 of the specification); the direction of the resultant force F received by the pusher tooth 22 is thus a direction perpendicular to the obliquely upward direction of the pusher tooth 22 side; the resultant force F can thus be decomposed into a horizontal component F1 and a vertical component F2 (see fig. 13 of the specification); because the pressing cylinder 7 is slidably arranged in the reducing control cylinder 6 through the spline teeth 21, the pressing cylinder can only do up-and-down movement; the horizontal component F1 is thus counteracted and the pressure cylinder 7 will move upwards with the upward movement of the drive cylinder 8 under the influence of the vertical component F2.
Then when the driving bar 23 on the driving cylinder 8 is completely attached to the gear adjusting teeth 20 and cannot move upwards, the driving cylinder 8 reaches the balance of force again and keeps still; at this time, the driving bar 23 of the driving cylinder 8 is abutted against the gear adjusting teeth 20 adjacent to the initial gear adjusting teeth 20, and the gear adjusting teeth 20 are stepped, so that the driving cylinder 8 moves downwards by a distance relative to the initial position; after the driving cylinder 8 moves downwards for a certain distance, the driving cylinder drives the I-shaped ring 9 and the pushing block 10 to move downwards for a certain distance at the same time; in the process of downwards moving the pushing block 10 for a certain distance, the T-shaped sliding rail 17 pushes the scraper 11 to radially move outwards for a certain distance, so that the purpose of expanding the scraper 11 is achieved.
Then injecting drilling fluid into the scraper to perform pressurizing and pressure releasing operations, wherein the pressurizing cylinder 7 and the driving cylinder 8 repeat the actions, the driving bar 23 of the driving cylinder 8 is abutted against the next gear adjusting tooth 20, the driving cylinder 8 is relatively moved downwards for a certain distance, and the scraper 11 is further opened; thus, the expanding diameter of the scraper 11 can be adjusted in a reciprocating pressing and pressure releasing mode; when the opening diameter of the scraper 11 corresponds to the diameter of the shaft to be cleaned, the scraper can be driven to act through the tool string, and wax precipitation in the shaft is scraped through the scraper 11 in the action process of the scraper, so that the shaft is cleaned.
When the well bores with the same diameter are cleaned, and the well bores with the small diameters need to be cleaned by downward movement, the scraper is lifted to the part of the well bore with the thickest diameter; then, through the mode of injecting drilling fluid into the scraper to perform pressurizing and pressure releasing operations, the scraper 11 is adjusted to a proper diameter, and then the scraper is placed at a proper position below the scraper to perform scraping cleaning; the purpose of this is to: when the scraper moves and the spreading diameter of the scraper 11 is adjusted, the scraper 11 can be spread gradually and sequentially and then reset and spread sequentially; therefore, when the scraper is lifted to the shaft part with the thickest diameter to adjust the opening diameter of the scraper 11, the problem that the scraper 11 interferes with the shaft can be avoided.
Therefore, when the scraper works, the scraper does not need to be lifted out of a shaft, and the cleaning work of the shaft can be completed, so that the problems of complex operation procedures and low cleaning efficiency existing in the process of cleaning the shaft by the conventional scraper are solved, and the production and use requirements of enterprises are met.
Claims (5)
1. The utility model provides a variable diameter scraper, it comprises top connection (1), urceolus (2), piston ring (3), core tube (4), core tube cap (5), reducing control section of thick bamboo (6), pressure section of thick bamboo (7), actuating cylinder (8), worker's shape ring (9), ejector pad (10) and scraper (11); the method is characterized in that: the lower end of the upper joint (1) is connected with an outer cylinder (2) through threads; a core tube (4) is fixedly arranged in the outer cylinder (2) through a connecting ring; the upper end of the core tube (4) is fixedly and hermetically connected with the outer cylinder (2) through a core tube cap (5); the outer cylinder (2) at the outer side of the core tube (4) is fixedly provided with a reducing control cylinder (6); a pressing cylinder (7) is slidably arranged in the reducing control cylinder (6) through a spline groove; the upper end of the pressing cylinder (7) extends to the upper part of the reducing control cylinder (6) and is fixedly provided with a piston ring (3); the piston ring (3) is in sliding sealing connection with the outer cylinder (2) and the core tube (4); a driving cylinder (8) is movably arranged below the reducing control cylinder (6); the driving cylinder (8) is in intermittent abutting connection with the variable-diameter control cylinder (6) and the pressing cylinder (7) respectively; an I-shaped ring (9) is movably arranged below the driving cylinder (8) through a return spring (16); the I-shaped ring (9) is in abutting connection with the driving cylinder (8); a plurality of pushing blocks (10) are uniformly and fixedly arranged on the circumferential surface of the I-shaped ring (9); the outer cylinder (2) at the outer side of the pushing block (10) is slidably provided with a scraper (11) through a limit guide block (18); the pushing block (10) is connected with the corresponding scraper (11) in a sliding clamping way;
a plurality of adjusting gears (19) are uniformly distributed on the end surface of the lower end of the reducing control cylinder (6); the adjusting gear (19) is composed of a plurality of gear adjusting teeth (20); the gear adjusting teeth (20) in the same adjusting gear (19) are of a ladder-shaped structure; the gear adjusting teeth (20) are of an inclined structure; a spline groove is formed in the diameter-variable control cylinder (6), and the diameter-variable control cylinder (6) is slidably provided with a pressing cylinder (7) through the spline groove;
spline teeth (21) are arranged on the circumferential surface of the pressing cylinder (7); the spline teeth (21) are in sliding connection with spline grooves in the reducing control cylinder (6); a plurality of pushing teeth (22) are arranged on the end surface of the lower end of the pressing cylinder (7) at intervals; the pushing teeth (22) are isosceles triangles, and the top ends of the pushing teeth (22) are arc-shaped.
2. A variable diameter scraper according to claim 1, wherein: the driving cylinder (8) is a stepped cylinder; the thin end part of the driving cylinder (8) extends into the pressing cylinder (7) and is connected with the pressing cylinder in a sliding way; a plurality of driving strips (23) are uniformly distributed on the circumferential surface of the thick end part of the driving cylinder (8); a driving inclined plane (24) is arranged on the upper end face of the driving strip (23); the driving inclined plane (24) is arranged opposite to the pushing teeth (22) of the pressing cylinder (7) and the gear adjusting teeth (20) of the reducing control cylinder (6) and is in intermittent abutting connection.
3. A variable diameter scraper according to claim 2, wherein: the inclination shape and the width of the driving inclined plane (24) are consistent with those of the gear adjusting teeth (20) of the reducing control cylinder (6); the end points of the two ends of the gear adjusting tooth (20) are positioned on the same straight line with the demarcation point of the pushing tooth (22) on the pressing cylinder (7).
4. A variable diameter scraper according to claim 3, wherein: the outer cylinder (2) is provided with a shearing pin (14); the upper end of the core tube (4) is provided with a bypass hole (15); when the piston ring (3) is in an initial state, the piston ring is in abutting connection with the core tube cap (5) and the shear pin (14) and is in sealing connection with the bypass hole (15).
5. A variable diameter scraper according to claim 4, wherein: one side of the pushing block (10) is obliquely provided with a T-shaped sliding rail (17); the pushing block (10) is connected with the corresponding scraper (11) in a sliding clamping way through a T-shaped sliding rail (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247041.3A CN109882126B (en) | 2019-03-29 | 2019-03-29 | Variable diameter pipe scraper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247041.3A CN109882126B (en) | 2019-03-29 | 2019-03-29 | Variable diameter pipe scraper |
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| Publication Number | Publication Date |
|---|---|
| CN109882126A CN109882126A (en) | 2019-06-14 |
| CN109882126B true CN109882126B (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910247041.3A Active CN109882126B (en) | 2019-03-29 | 2019-03-29 | Variable diameter pipe scraper |
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| CN (1) | CN109882126B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242233B (en) * | 2019-07-24 | 2024-04-09 | 西南石油大学 | Hydraulic type variable outer diameter rock debris bed cleaning tool |
| CN112983355B (en) * | 2019-12-18 | 2022-06-03 | 中国石油天然气股份有限公司 | Reducing paraffin scraper |
| CN112593897B (en) * | 2021-01-14 | 2022-12-09 | 长江大学 | Controllable reducing scraper |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204457637U (en) * | 2015-02-05 | 2015-07-08 | 中石化石油工程技术服务有限公司 | Hydraulic variable diameter milling pipeline scraper |
| CN108104771A (en) * | 2017-12-07 | 2018-06-01 | 中国海洋石油集团有限公司 | A kind of big reducing casing tube burnisher |
| CN109296327A (en) * | 2018-12-04 | 2019-02-01 | 长江大学 | A kind of complex cyclone flushing tool |
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| RU2278247C2 (en) * | 2001-01-08 | 2006-06-20 | Сяоянь ЛЮ | Automatic device for jack well cleaning of paraffin |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204457637U (en) * | 2015-02-05 | 2015-07-08 | 中石化石油工程技术服务有限公司 | Hydraulic variable diameter milling pipeline scraper |
| CN108104771A (en) * | 2017-12-07 | 2018-06-01 | 中国海洋石油集团有限公司 | A kind of big reducing casing tube burnisher |
| CN109296327A (en) * | 2018-12-04 | 2019-02-01 | 长江大学 | A kind of complex cyclone flushing tool |
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