CN212359679U - Positive and negative circulation scraping and washing tool - Google Patents

Positive and negative circulation scraping and washing tool Download PDF

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Publication number
CN212359679U
CN212359679U CN202021152886.9U CN202021152886U CN212359679U CN 212359679 U CN212359679 U CN 212359679U CN 202021152886 U CN202021152886 U CN 202021152886U CN 212359679 U CN212359679 U CN 212359679U
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China
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scraping
sliding sleeve
mandrel
circulation
positive
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CN202021152886.9U
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Chinese (zh)
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孙耀龙
刘俊霖
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孙耀龙
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Abstract

The utility model discloses a positive and negative circulation scraping and washing tool, which comprises a positive circulation washing and scraping and washing function and a reverse circulation washing function, and the positive and reverse circulation scraping and washing tool comprises an upper joint 1, wherein the right end of the upper joint 1 is communicated with a cylindrical middle upper body 3, and a sliding sleeve 6 is slidably connected in the middle upper body 3; a first step 28 is formed in the middle of the middle upper body 3, and a second step 29 is formed in the sliding sleeve 6; an elastic device is connected between the first step 28 and the second step 29. The utility model discloses a positive reverse circulation scraping flushing tool is arranged in fracturing production increasing operation, and the fracturing grit that exists in the pit shaft after the fracturing needs to be cleared up, has the pit shaft to wash the unclean condition when the grit washs, leads to the well bottom under the follow-up tool string, and then leads to the tool string to meet and hinder or meet the card. During the process of cleaning the sand in the shaft, the scraping shell of the positive and negative circulation flushing tool can remove the sand in the shaft and foreign matters stuck on the wall of the shaft through mechanical scraping and hydraulic flushing.

Description

Positive and negative circulation scraping and washing tool
Technical Field
The utility model relates to an oil fracturing raising output technical field, concretely relates to positive and negative circulation scraping and washing tool.
Background
The positive and negative circulation scraping and flushing tool is used in fracturing stimulation operation. After the perforation gun is used for perforating a hole on the casing in the underground, the fracturing operation is carried out, a large amount of sand is pressed into the stratum for making a seam, and the fractured sand in the shaft needs to be cleaned at the moment for carrying out subsequent fracturing or other operations. When sand is cleaned, the condition that a shaft is not cleaned completely exists, so that a subsequent tool string cannot go to the bottom of a well, and further the tool string is blocked or blocked, so that troubles are caused, and therefore the sand in the shaft needs to be cleaned completely.
In the process of cleaning sand in a shaft, high-pressure liquid is often driven into the shaft for circular cleaning, but sticky foreign matters on the shaft wall under the condition of unclean cleaning are not cleaned sufficiently by washing. The reverse circulation scraping and washing tool can not only clean sand in a shaft, but also remove foreign matters on the wall of the well through the scraping effect.
The positive and negative circulation scraping and washing tool can be used for timely, quickly and effectively cleaning sand and foreign matters in a shaft, is simple in construction process, can be cleaned up only by providing certain pressure, improves washing efficiency, and has safety and economy. There is a need to develop new wellbore cleaning tools that address the practical problems.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model aims to provide a positive and negative circulation scraping and washing tool, this instrument setting is in the tool string lower extreme, and accessible oil pipe or coiled tubing transfer, and the ground is opened the pump and is suppressed and carry out the pit shaft and wash.
In order to achieve the above object, the utility model adopts the following technical scheme:
a positive and negative circulation scraping and flushing tool comprises an upper joint 1, wherein the right end of the upper joint 1 is communicated with a cylindrical middle upper body 3, and a sliding sleeve 6 is slidably connected in the middle upper body 3; a first step 28 is formed in the middle of the middle upper body 3, and a second step 29 is formed in the sliding sleeve 6; an elastic device is connected between the first step 28 and the second step 29; a convex ball seat 7 is slidably connected to a second step 29 of the sliding sleeve 6, a circulation baffle 26 is fixedly connected to the left end of the ball seat 7, a plurality of through holes are formed in the circulation baffle 26 and fixedly connected with the middle upper body 3, and a one-way valve structure is mounted at the right end of the ball seat 7; a hole A30 is formed on the side wall of the ball seat 7, and a side groove 31 communicated with the hole A30 is formed on the left side of the second step 29 on the sliding sleeve 6; the right side of the ball seat 7 is provided with a circulating pipe 22 which is connected in a sliding way in the sliding sleeve 6, the left end of the circulating pipe 22 is provided with a hole B32, and the right end of the circulating pipe and the middle lower body 20 are provided with a sliding gap 33; the circulating pipe 22 is fixedly connected with a tubular middle lower body 20 fixedly connected with the middle upper body 3; the side wall of the middle lower body 20 is provided with a C hole 34 matched with the sliding gap 33; the middle lower body 20 is axially connected with a tubular mandrel 18, the mandrel 18 is externally sleeved and fixed with a screw shaft 14, the screw shaft 14 is externally sleeved with an annular pipe 36, and a spiral diversion trench 37 is formed between the annular pipe 36 and the screw shaft 14; the inner cavity of the mandrel 18 is communicated with the spiral diversion groove 37 of the spiral shaft 14; the mandrel 18 is provided with a hole E39 communicated with the annular cavity 35; the middle part of the mandrel 18 is fixed with a scraping shell 15, the right end is fixed with a guide cone 17, and the guide cone 17 is provided with a second nozzle 16.
In a further improvement, a plurality of obliquely arranged first nozzles 2 are arranged on the upper joint 1 along the circumferential direction; the elastic device is a spring 9; the one-way valve structure is a one-way valve or a steel ball 25; the hole A30 is an inclined hole; the side grooves 31 are annular grooves; an annular cavity 35 is formed between the screw shaft 14 and the mandrel 18; the annular chamber 35 is arranged in communication with the spindle 18 and the helical guide groove 37.
In a further improvement, the upper joint 1 is connected with the middle upper body 3 through threads, and a plurality of third jackscrews 27 are arranged on the middle upper body 3 to prevent the threads of the upper joint 1 connected with the middle upper body 3 from being loosened; the upper joint 1 is provided with a first O-shaped ring 4 for sealing between the upper joint 1 and the middle upper body 3; a third O-shaped ring 8 is arranged between the sliding sleeve 6 and the circulating pipe 22 and is used for sealing the sliding sleeve 6 and the circulating pipe 22; the circulation pipe 22 is fixedly connected to the middle lower body 20 by means of screw threads.
In a further improvement, a third O-shaped ring 8 is arranged between the sliding sleeve 6 and the circulating pipe 22 and is used for sealing the sliding sleeve 6 and the circulating pipe 22; a second O-shaped ring 5 is arranged between the sliding sleeve 6 and the ball seat 7 and is used for sealing between the sliding sleeve 6 and the ball seat 7; the middle upper body 3 is connected with the middle lower body 20 through screw threads.
In a further improvement, a plurality of second jackscrews 23 are arranged on the middle lower body 20 to prevent the threads of the middle upper body 3 and the middle lower body 20 from being loosened; a fourth O-shaped ring 10 is arranged on the middle upper body 3 for sealing with the middle lower body 20; a seventh O-shaped ring 21 is arranged on the sliding sleeve 6 and used for sealing with the middle lower body 20; an eighth O-shaped ring 24 is arranged on the ball seat 7 for sealing with the circulating pipe 22; a fifth O-ring 11 is provided at the circulation pipe 22 for sealing with the intermediate lower body 20.
In a further improvement, the middle lower body 20 is connected with the mandrel 18 through threads and is sealed through a sixth O-shaped ring 12; a plurality of first jackscrews 19 are arranged on the middle lower body 20 to prevent the threads between the middle lower body 20 and the mandrel 18 from being loosened; two screw shafts 14 are arranged on the mandrel 18, and the screw shafts 14 are sleeved on the mandrel 18; a plane roller bearing 13 is arranged between the screw shaft 14 at the upper part and the middle lower body 20; the lowest end is provided with a guide cone 17 which is connected with a mandrel 18 through threads; another plane roller bearing 13 is arranged between the screw shaft 14 at the lower part and the guide cone 17; a plurality of holes which are downward and oblique are arranged on the guide cone 17; the second nozzle 16 is connected with the guide cone 17 through threads, the first nozzle 2 is connected with the upper connector 1 through threads, and the first nozzle 2 and the second nozzle 16 can be detached and replaced.
In a further improvement, one end of the spiral shaft 14 is provided with four guide keys which are matched with the four guide keys in the scraping shell 15 to play a linkage role; the other end is provided with a plurality of spiral chutes for guiding flow; a plurality of chutes are arranged outside the scraping shell 15, and hardening treatment is carried out on the chutes, so that the scraping service life is prolonged; the inner wall of the scraper housing 15 is provided with a number of D-holes 38 for the outflow of liquid.
Drawings
FIG. 1 is a schematic diagram of a forward and reverse circulation scraping and flushing tool of the present invention;
FIG. 2 is a schematic diagram of the construction of a positive and negative circulation scraping and flushing tool of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a structural view of the screw shaft;
FIG. 5 is a block diagram of a shave housing;
wherein: 1-upper joint; 2-a first nozzle; 3-middle upper body; 4-a first O-ring; 5-a second O-ring; 6-sliding sleeve; 7-a ball seat; 8-a third O-ring; 9-a spring; 10-a fourth O-ring; 11-a fifth O-ring; 12-a sixth O-ring; 13-a planar roller bearing; 14-a helical axis; 15-scraping the shell; 16-a second nozzle; 17-a pilot cone; 18-a mandrel; 19-a first jackscrew; 20-middle lower body; 21-seventh O-ring; 22-a circulation pipe; 23-a second jackscrew; 24-an eighth O-ring; 25-steel ball; 26-a circulation baffle; 27-third terminal screw; 28-a first step; 29-a second step; 30-A hole; 31-side groove; 32-B holes; 33-F pores; 34-C hole; 35-an annular cavity; 36-a ring-shaped tube; 37-spiral diversion trench; 38-D wells; 39-E pore.
Detailed Description
To make the objects, aspects and advantages of the present invention clearer, and in accordance with the following detailed description of certain embodiments of the present invention, it is to be understood that the terms "center," "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship shown in the accompanying drawings, which are used for convenience of description and simplicity of illustration, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a forward and reverse circulation scraping and flushing tool, which comprises a forward circulation flushing scraping and flushing function and a reverse circulation flushing function.
Referring to fig. 1, a plurality of first nozzles 2 are provided on an upper joint 1, and the direction is inclined upward. The upper joint 1 is connected with the middle upper body 3 through threads, and a plurality of third jackscrews 27 are arranged on the middle upper body 3 to prevent the threads of the upper joint 1 connected with the middle upper body 3 from being loosened. A first O-ring 4 is provided on the upper joint 1 for sealing between the upper joint 1 and the intermediate upper body 3. A sliding sleeve 6 is arranged in the middle upper body 3. A spring 9 is arranged between the sliding sleeve 6 and the middle upper body 3. One end of the spring 9 is propped against the sliding sleeve 6, and the other end is propped against the middle upper body 3. The ball seat 7 and the circulating pipe 22 are arranged inside the sliding sleeve 6. The circulation pipe 22 is connected to the middle lower body 20 by means of screw threads. And a third O-shaped ring 8 is arranged between the sliding sleeve 6 and the circulating pipe 22 and is used for sealing the sliding sleeve 6 and the circulating pipe 22. A second O-shaped ring 5 is arranged between the sliding sleeve 6 and the ball seat 7 and is used for sealing between the sliding sleeve 6 and the ball seat 7. The ball seat 7 is provided with a plurality of inclined holes inside for liquid circulation. The circulation baffle 26 is sandwiched between the ball seat 7 and the upper joint 1, and a plurality of holes are arranged on the circulation baffle. The ball seat 7 is internally provided with a steel ball 25. The steel ball 25 is movable back and forth between the ball seat 7 and the circulating barrier 26.
As a preferred embodiment of the present invention, referring to fig. 1, the middle upper body 3 is screwed to the middle lower body 20. The middle lower body 20 is provided with a plurality of second jackscrews 23 to prevent the middle upper body 3 and the middle lower body 20 from being loosened by threads. A fourth O-ring 10 is provided on the intermediate upper body 3 for sealing with the intermediate lower body 20. A seventh O-ring 21 is provided on the sliding sleeve 6 for sealing with the intermediate lower body 20. An eighth O-ring 24 is provided on the ball seat 7 for sealing with the circulation tube 22. A fifth O-ring 11 is provided at the circulation pipe 22 for sealing with the intermediate lower body 20.
As a preferred embodiment of the present invention, referring to fig. 1, the middle lower body 20 is provided with a plurality of holes for liquid flow passages. The circulating pipe is provided with a plurality of annular grooves for liquid flowing channels.
Referring to fig. 1, as a preferred embodiment of the present invention, the lower middle body 20 is connected to the mandrel 18 by a screw thread, and is sealed between the sixth O-ring 12. A plurality of first top threads 19 are arranged on the middle lower body 20 to prevent the threads of the middle lower body from being loosened from the mandrel 18. Two screw shafts 14 are arranged on the mandrel 18, and the screw shafts 14 are sleeved on the mandrel 18. A flat roller bearing 13 is provided between the upper screw shaft 14 and the intermediate lower body 20. At the lowermost end a lead cone 17 is provided which is threadedly connected to a spindle 18. Another plane roller bearing 13 is arranged between the lower screw shaft 14 and the guide cone 17. A scraper housing 15 is provided on the intermediate lower body 20 and the pilot cone 17. A plurality of holes which are inclined downwards are arranged on the guide cone 17. A second nozzle 16 is provided which is screwed in. The first nozzle 2 and the second nozzle 16 are detachable for replacement.
As a preferred embodiment of the present invention, referring to fig. 1, the mandrel 18 is provided with a plurality of holes for liquid flow passages. One end of the spiral shaft 14 is provided with four guide keys which are matched with the four guide keys in the scraping shell 15 to play a linkage role. And a plurality of spiral chutes are arranged at the other end of the water tank and are used for guiding water. The outer surface of the scraping shell 15 is provided with a plurality of chutes, and the chutes are hardened to prolong the scraping service life. The inner wall is provided with a plurality of inclined holes for liquid to flow out.
Introduction of the working principle:
the positive circulation flushing scraping flushing principle: as shown in figures 1, 2, 3, 4, 5. The cleaning liquid with certain pressure is input into the positive and negative circulation scraping and washing tool through an oil pipe or a continuous oil pipe and flows into the upper joint 1, and the cleaning liquid cannot flow into the circulating pipe 22 when passing through the circulating baffle 26, and the steel ball is pressed on the ball seat 7 by the cleaning liquid. One part of the cleaning liquid flows into the first nozzle 2 and washes the shaft obliquely upwards, and the other part of the cleaning liquid flows into an annular space between the cleaning liquid and the sliding sleeve 6 through a plurality of inclined holes (A holes) of the ball seat 7, so that the cleaning liquid presses the sliding sleeve 6 downwards, and the spring 9 is compressed. At this time, several inclined holes (holes B) in the circulation tube 22 are opened, and at the same time, the sliding sleeve 6 is moved down, so that several holes (holes C) in the middle lower body 20 are closed. The cleaning fluid thus flows through the a holes and through the B holes into the mandrel 18. A portion of the cleaning fluid flows to the second nozzle 16 for jet washing of the sand downhole; the other part of the cleaning liquid flows to a plurality of holes of the mandrel 18, namely the holes E, and further flows to an annular cavity between the mandrel 18 and the spiral shaft 14, and the cleaning liquid with pressure flows to a plurality of spiral guide grooves of the spiral shaft 14 to drive the spiral shaft 14 to rotate. The screw shaft 14 and the scraping shell 15 are matched together to transmit torque through four guide keys. Since the spiral shaft 14 is rotated by the hydraulic pressure of the cleaning liquid, the scraper housing 15 is rotated, and a portion of the cleaning liquid is ejected through several inclined holes, i.e., D holes, on the scraper housing 15, on one hand, a certain rotational force is also provided to the scraper housing 15, and on the other hand, the wall of the well is washed. The rotation of the scraper housing 15 mechanically cleans the well bore from sand and foreign matter. The two flat roller bearings 13 provided here make the two screw shafts 14 rotate more smoothly. This is a cycle from inside to outside.
Reverse circulation flushing principle: as shown in fig. 1 and 2. Cleaning liquid with certain pressure flows into the circulating pipe 22 through a plurality of holes, namely C holes, of the middle lower body 20 through the annular space between the reverse circulation scraping and washing tool and the shaft, carried foreign matters such as sand and the like flow, at the moment, the sliding sleeve 6 is pushed up by the spring 9, and the C holes of the middle lower body 20 are communicated with the circulating pipe. The cleaning liquid flows to the ball seat 7, the steel ball 25 is opened, and the cleaning liquid flows to the interior of the reverse circulation scraping and washing tool through the hole on the circulation baffle 26, and the cleaning liquid is conveyed to the ground through an oil pipe or a continuous oil pipe. This is the cycle from outside to inside.
The working process of the utility model is as follows:
as shown in figures 1, 2, 3, 4, 5. The utility model discloses the work is in order to carry out the operation of scraping and washing with the grit in the pit shaft after fracturing with being stained with the foreign matter that glues on the pit shaft, divide into two kinds of operation modes.
One is a positive cycle scraping and flushing operation. Cleaning fluid with certain pressure flows into the cleaning tool through the oil pipe or the continuous oil pipe, and one part of the cleaning fluid washes the shaft through the first nozzle 2; one part of the cleaning liquid flows to the hole A of the ball seat 7 through the hole of the circulating baffle 26, presses down the sliding sleeve 6, flows to the hole B of the circulating pipe 22 and further flows to the hole E of the mandrel 18, the cleaning liquid at the moment has certain pressure to flow through a plurality of spiral flow guide grooves of the spiral shaft 14 to enable the spiral shaft 14 to rotate, and then the scraping shell 15 is driven to rotate, so that the scraping shell can mechanically treat sand and foreign matters in a shaft and is cleaned. The liquid in the scraping shell 15 flows out through the hole D, on one hand, the liquid is provided with rotating power, and on the other hand, the liquid washes the well wall. And a part of the cleaning liquid with pressure flows to a plurality of obliquely downward holes of the guide cone 17 to wash the well wall, and a part of the cleaning liquid flows to the second nozzle to carry out vertical downward high-impact cleaning operation.
One is reverse circulation flushing operation. Cleaning liquid with certain pressure flows into the circulating pipe 22 through a plurality of holes, namely C holes, of the middle lower body 20 through the annular space between the reverse circulation scraping and washing tool and the shaft, carried foreign matters such as sand flow, at the moment, the sliding sleeve 6 is pushed up by the spring 9, and the C holes of the middle lower body 20 are communicated with the circulating pipe. The cleaning liquid flows to the ball seat 7, the steel ball 25 is opened, and the cleaning liquid flows to the interior of the reverse circulation scraping and washing tool through the hole on the circulation baffle 26, and the cleaning liquid is conveyed to the ground through an oil pipe or a continuous oil pipe. This is the cycle from outside to inside.

Claims (7)

1. A positive and negative circulation scraping and washing tool is characterized by comprising an upper joint (1), wherein the right end of the upper joint (1) is communicated with a cylindrical middle upper body (3), and a sliding sleeve (6) is slidably connected in the middle upper body (3); a first step (28) is formed in the middle of the middle upper body (3), and a second step (29) is formed in the sliding sleeve (6); an elastic device is connected between the first step (28) and the second step (29); a convex ball seat (7) is slidably connected to a second step (29) of the sliding sleeve (6), a circulating baffle (26) is fixedly connected to the left end of the ball seat (7), a plurality of through holes are formed in the circulating baffle (26) and are fixedly connected with the middle upper body (3), and a one-way valve structure is installed at the right end of the ball seat (7); a hole A (30) is formed on the side wall of the ball seat (7), and a side groove (31) communicated with the hole A (30) is formed on the left side of a second step (29) on the sliding sleeve (6); the right side of the ball seat (7) is provided with a circulating pipe (22) which is connected in a sliding way in the sliding sleeve (6), the left end of the circulating pipe (22) is provided with a hole B (32), and the right end of the circulating pipe and the middle lower body (20) are provided with a sliding gap (33); the circulating pipe (22) is fixedly connected with a tubular middle lower body (20) which is fixedly connected with the middle upper body (3); a C hole (34) matched with the sliding gap (33) is formed in the side wall of the middle lower body (20); the middle lower body (20) is axially connected with a tubular mandrel (18), a spiral shaft (14) is fixedly sleeved outside the mandrel (18), an annular pipe (36) is sleeved outside the spiral shaft (14), and a spiral flow guide groove (37) is formed between the annular pipe (36) and the spiral shaft (14); the inner cavity of the mandrel (18) is communicated with a spiral diversion groove (37) of the spiral shaft (14); the mandrel (18) is provided with a hole (39) which is communicated with the annular cavity (35) through an E hole; a scraping shell (15) is fixed in the middle of the mandrel (18), a guide cone (17) is fixed at the right end, and a second nozzle (16) is installed on the guide cone (17).
2. The positive and negative circulation scraping and washing tool as claimed in claim 1, wherein the upper joint (1) is circumferentially provided with a plurality of obliquely arranged first nozzles (2); the elastic device is a spring (9); the one-way valve structure is a one-way valve or a steel ball (25); the hole A (30) is an inclined hole; the side groove (31) is an annular groove; an annular cavity (35) is formed between the screw shaft (14) and the mandrel (18); the annular cavity (35) is communicated with the mandrel (18) and the spiral diversion trench (37).
3. The positive and negative circulation scraping and washing tool as claimed in claim 1, wherein the upper joint (1) is connected with the middle upper body (3) through screw threads, and a plurality of third top threads (27) are arranged on the middle upper body (3) to prevent the screw threads of the upper joint (1) and the middle upper body (3) from being loosened; a first O-shaped ring (4) is arranged on the upper joint (1) and used for sealing between the upper joint (1) and the middle upper body (3); a third O-shaped ring (8) is arranged between the sliding sleeve (6) and the circulating pipe (22) and is used for sealing the sliding sleeve (6) and the circulating pipe (22); the circulating pipe (22) is fixedly connected with the middle lower body (20) through threads.
4. The positive and negative circulation scraping and washing tool as claimed in claim 1, wherein a third O-ring (8) is provided between the sliding sleeve (6) and the circulation pipe (22) for sealing with the sliding sleeve (6) and the circulation pipe (22); a second O-shaped ring (5) is arranged between the sliding sleeve (6) and the ball seat (7) and is used for sealing between the sliding sleeve (6) and the ball seat (7); the middle upper body (3) is connected with the middle lower body (20) through threads.
5. The forward-backward circulation scraping and washing tool as claimed in claim 1, wherein a plurality of second jackscrews (23) are provided on the middle lower body (20) to prevent the middle upper body (3) from being unscrewed from the middle lower body (20); a fourth O-shaped ring (10) is arranged on the middle upper body (3) and is used for sealing with the middle lower body (20); a seventh O-shaped ring (21) is arranged on the sliding sleeve (6) and is used for sealing with the middle lower body (20); an eighth O-shaped ring (24) is arranged on the ball seat (7) and is used for sealing the circulation pipe (22); a fifth O-ring (11) is provided on the circulation tube (22) for sealing with the intermediate lower body (20).
6. A positive and negative circulation scraping and washing tool according to claim 1, characterized in that said intermediate lower body (20) is screwed to the spindle (18) and sealed by a sixth O-ring (12); a plurality of first jackscrews (19) are arranged on the middle lower body (20) to prevent the threads between the middle lower body (20) and the mandrel (18) from being loosened; two screw shafts (14) are arranged on the mandrel (18), and the screw shafts (14) are sleeved on the mandrel (18); a plane roller bearing (13) is arranged between the screw shaft (14) at the upper part and the middle lower body (20); the lowest end of the screw rod is provided with a guide cone (17) which is connected with a mandrel (18) through threads; another plane roller bearing (13) is arranged between the screw shaft (14) at the lower part and the guide cone (17); a plurality of holes which are inclined downwards are arranged on the guide cone (17); the second nozzle (16) is in threaded connection with the guide cone (17), the first nozzle (2) is in threaded connection with the upper connector (1), and the first nozzle (2) and the second nozzle (16) can be detached and replaced.
7. The scraping and flushing tool with positive and negative circulation as claimed in claim 1, wherein one end of the screw shaft (14) is provided with four guide keys which are matched with the four guide keys in the scraping shell (15) for linkage; the other end is provided with a plurality of spiral chutes for guiding flow; a plurality of chutes are arranged outside the scraping shell (15), and hardening treatment is carried out on the chutes, so that the scraping service life is prolonged; the inner wall of the scraping shell (15) is provided with a plurality of D holes (38) for liquid to flow out.
CN202021152886.9U 2020-06-20 2020-06-20 Positive and negative circulation scraping and washing tool Active CN212359679U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021152886.9U CN212359679U (en) 2020-06-20 2020-06-20 Positive and negative circulation scraping and washing tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021152886.9U CN212359679U (en) 2020-06-20 2020-06-20 Positive and negative circulation scraping and washing tool

Publications (1)

Publication Number Publication Date
CN212359679U true CN212359679U (en) 2021-01-15

Family

ID=74150897

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021152886.9U Active CN212359679U (en) 2020-06-20 2020-06-20 Positive and negative circulation scraping and washing tool

Country Status (1)

Country Link
CN (1) CN212359679U (en)

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