CN111535760B - Forward and reverse circulation scraping and flushing tool and application method thereof - Google Patents
Forward and reverse circulation scraping and flushing tool and application method thereof Download PDFInfo
- Publication number
- CN111535760B CN111535760B CN202010569172.6A CN202010569172A CN111535760B CN 111535760 B CN111535760 B CN 111535760B CN 202010569172 A CN202010569172 A CN 202010569172A CN 111535760 B CN111535760 B CN 111535760B
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- scraping
- circulation
- lower body
- sliding sleeve
- hole
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- 238000007790 scraping Methods 0.000 title claims abstract description 69
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 42
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 34
- 238000007789 sealing Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
- E21B37/04—Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a forward and backward circulation scraping and flushing tool and a use method thereof. The positive and negative circulation scraping and flushing tool is used for fracturing sand in a well bore after fracturing needs to be cleaned in the fracturing yield increasing operation, and the well bore is not cleaned when the sand is cleaned, so that a subsequent tool string cannot go to the bottom of the well, and further the tool string is blocked or blocked. In the process of cleaning sand in a 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 well wall through mechanical scraping and hydraulic flushing.
Description
Technical Field
The invention relates to the technical field of petroleum fracturing yield increase, in particular to a positive and negative circulation scraping and flushing tool.
Background
The positive and negative circulation scraping and flushing tool is used in fracturing and yield increasing operation. After the perforation gun is used for shooting holes on the casing pipe in the well, the pressurizing and fracturing operation is carried out, a large amount of sand is pressed into the stratum to make a seam, and at the moment, the fracturing sand in the well bore needs to be cleaned, and subsequent fracturing or other operations are carried out. When the sand is cleaned, the condition that the shaft is not cleaned exists, so that the subsequent tool string cannot reach the bottom of the shaft, and further the tool string is blocked or blocked, thereby causing trouble, and the sand in the shaft needs to be cleaned.
In the sand process in the cleaning shaft, high-pressure liquid is pumped into the shaft to circularly clean, but the cleaning is not clean enough to clean the viscous foreign matters on the well wall. The reverse circulation scraping and flushing tool not only can clean sand in a shaft, but also can remove foreign matters on the shaft wall through scraping.
The forward and reverse circulation scraping and flushing tool can clean sand and foreign matters in a shaft timely, quickly and effectively, is simple in construction process, can clean the shaft by only providing certain pressure, improves flushing efficiency, and has safety and economy. There is a need to develop such new wellbore cleaning tools that address practical problems.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a positive and negative circulation scraping and flushing tool which is arranged at the lowest end of a tool string and can be lowered through an oil pipe or a continuous oil pipe to clean a shaft by pumping on the ground.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The 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 connected in a sliding manner 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 second step 29 of the sliding sleeve 6 is slidably connected with a convex ball seat 7, the left end of the ball seat 7 is fixedly connected with a circulating baffle 26, a plurality of through holes are formed in the circulating baffle 26 and are fixedly connected with the middle upper body 3, and the right end of the ball seat 7 is provided with a one-way valve structure; an A hole 30 is formed in the side wall of the ball seat 7, and a side groove 31 communicated with the A hole 30 is formed in 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 B hole 32, and the right end of the circulating pipe 22 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 formed with a C hole 34 matched with the sliding clearance 33; the middle lower body 20 is connected with a tubular mandrel 18 in a shaft way, a screw shaft 14 is sleeved and fixed outside the mandrel 18, an annular pipe 36 is sleeved outside the screw shaft 14, and a screw 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 a spiral diversion trench 37 of the spiral shaft 14; the mandrel 18 is provided with a hole E which is 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 guiding cone 17, and a second nozzle 16 is arranged on the guiding cone 17.
Further improvement, the upper joint 1 is circumferentially provided with a plurality of first nozzles 2 which are obliquely arranged; the elastic device is a spring 9; the check valve structure is a check valve or a steel ball 25; the A hole 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 disposed in communication with the spindle 18 and the spiral guide slot 37.
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 loosening; 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 between the sliding sleeve 6 and the circulating pipe 22; the circulation pipe 22 is fixedly connected with the middle lower body 20 through threads.
A third O-shaped ring 8 is arranged between the sliding sleeve 6 and the circulating pipe 22 and is used for sealing between 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 threads.
Further improvement, a plurality of second jackscrews 23 are arranged 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-ring 10 is provided on the intermediate upper body 3 for sealing with the intermediate lower body 20; a seventh O-ring 21 is arranged on the sliding sleeve 6 for sealing with the middle 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 tube 22 for sealing with the intermediate lower body 20.
Further improvements, the intermediate lower body 20 is screwed with 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 thread loosening between the middle lower body 20 and 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 plane roller bearing 13 is arranged between the upper screw shaft 14 and the middle lower body 20; the bottommost 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 and the guide cone 17 at the lower part; a plurality of holes which are inclined downwards are arranged on the guide cone 17; the second nozzle 16 is connected with the guide cone 17 through threads, and the first nozzle 2 is connected with the upper joint 1 through threads, so that the first nozzle 2 and the second nozzle 16 can be detached and replaced.
Further improvement, 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 to play a linkage role; the other end is provided with a plurality of spiral chute for guiding flow; a plurality of inclined grooves are arranged outside the scraping shell 15, and hardening treatment is carried out on the inclined grooves, so that the scraping service life is prolonged; the scraping housing 15 is provided with a number of D holes 38 on its inner wall for the outflow of liquid.
The application method of the forward and backward circulation scraping and flushing tool comprises a forward circulation flushing and scraping method and backward circulation flushing operation;
The positive circulation flushing and scraping method comprises the following steps:
The upper joint 1 is communicated with an oil pipe, cleaning liquid is pressed into a forward and backward circulation scraping and flushing tool, and a part of the cleaning liquid is used for flushing a shaft through a first nozzle 2; part of the sand flows to the hole A of the ball seat 7 through the hole of the circulation baffle 26, presses down the sliding sleeve 6, flows to the hole B of the circulation pipe 22 and then flows to the hole E of the mandrel 18, and flows through the spiral diversion trench of the spiral shaft 14 to enable the spiral shaft 14 to rotate, so that the scraping shell 15 is driven to rotate, and sand and foreign matters in a shaft are mechanically treated by the scraping shell, and cleaned; the liquid in the scraping shell 15 flows out through the D hole, on one hand, provides rotating power and on the other hand washes the well wall; a part of the pressurized cleaning fluid flows to a plurality of inclined downward holes of the guide cone 17 to wash the well wall, and a part flows to the second nozzle 16 to perform a vertical downward high-impact cleaning operation.
Further improved, the steps of the reverse circulation flushing operation are as follows:
The upper joint 1 is communicated with an oil pipe, negative pressure is formed in the suction forward and reverse circulation scraping and flushing tool or cleaning liquid is pressed in the annular space between the forward and reverse circulation scraping and flushing tool and a shaft, the cleaning liquid flows carried foreign matters into the circulating pipe 22 through the C hole of the middle lower body 20, at the moment, the sliding sleeve 6 is pushed up by the spring 9, and the C hole of the middle lower body 20 is in a communicating state with the circulating pipe; the cleaning fluid then flows to the ball seat 7, opens the ball 25, and then flows through the holes in the circulation screen 26 to the inside of the reverse circulation scraping flushing tool, where the fluid is delivered to the surface through the tubing or coiled tubing.
Drawings
FIG. 1 is a block diagram of a forward and reverse circulation scraping and flushing tool of the present invention;
FIG. 2 is a schematic construction diagram of a forward and reverse circulation scraping and flushing tool according to 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-an intermediate upper body; 4-a first O-ring; 5-a second O-ring; 6, sliding sleeve; 7-ball seat; 8-a third O-ring; 9-a spring; 10-fourth O-ring; 11-a fifth O-ring; 12-sixth O-ring; 13-plain roller bearings; 14-a screw shaft; 15-scraping the shell; 16-a second nozzle; 17-cone introduction; 18-a mandrel; 19-a first jackscrew; 20-an intermediate lower body; 21-seventh O-ring; 22-circulation pipe; 23-a second jackscrew; 24-eighth O-ring; 25-steel balls; 26-a circulation baffle; 27-a third jackscrew; 28-a first step; 29-a second step; 30-A well; 31-side grooves; a 32-B well; 33-F wells; 34-C well; 35-an annular cavity; 36-an annular tube; 37-spiral diversion trenches; 38-D well; 39-E well.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present invention, the following description will be made in detail with reference to specific embodiments, it should be understood that the terms "center," "vertical," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. are used for convenience of description and for simplifying the description, but do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the forward and reverse circulation scraping and flushing tool of the present invention is characterized by comprising a forward circulation scraping and flushing function and a reverse circulation flushing function.
As a preferred embodiment of the invention, with reference to fig. 1, it comprises an upper joint 1 on which a number of first nozzles 2 are arranged, oriented obliquely upwards. 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 upper joint 1 from being connected with the middle upper body 3 through threads. 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 sliding sleeve 6 is internally provided with a ball seat 7 and a circulating pipe 22. The circulation pipe 22 is connected to the intermediate lower body 20 by screw threads. A third O-ring 8 is arranged between the sliding sleeve 6 and the circulating pipe 22 and is used for sealing between the sliding sleeve 6 and the circulating pipe 22. A second O-ring 5 is arranged between the sliding sleeve 6 and the ball seat 7 for sealing between the sliding sleeve 6 and the ball seat 7. The ball seat 7 is internally provided with a plurality of inclined holes for liquid circulation. The ball seat 7 and the upper joint 1 sandwich a circulation baffle 26, on which a number of holes are provided. A steel ball 25 is arranged inside the ball seat 7. The ball 25 is movable back and forth between the ball seat 7 and the circulation gate 26.
As a preferred embodiment of the present invention, referring to fig. 1, the intermediate upper body 3 is screwed with the intermediate lower body 20. A plurality of second jackscrews 23 are arranged 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-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 tube 22 for sealing with the intermediate lower body 20.
As a preferred embodiment of the present invention, referring to fig. 1, the intermediate lower body 20 is provided with a number of holes for the liquid flow channels. The circulation tube is provided with a plurality of annular grooves for the liquid flow passage.
As a preferred embodiment of the invention, referring to fig. 1, the intermediate lower body 20 is threadably connected to the spindle 18 and sealed between the sixth O-ring 12. A number of first jackscrews 19 are provided on the intermediate lower body 20 to prevent unscrewing between them and 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 planar roller bearing 13 is provided between the upper screw shaft 14 and the intermediate lower body 20. At the lowermost end a guiding cone 17 is arranged which is connected with a spindle 18 by means of a screw thread. Another plane roller bearing 13 is arranged between the lower screw shaft 14 and the guide cone 17. A scraping housing 15 is provided on the intermediate lower body 20 and the guide cone 17. A number of holes diagonally downward are provided in the guide cone 17. A second nozzle 16 is provided which is screwed. The first nozzle 2 and the second nozzle 16 are detachable and replaceable.
As a preferred embodiment of the invention, and with reference to fig. 1, the mandrel 18 is provided with a number of holes for the liquid flow channels. 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 to play a linkage role. The other end is provided with a plurality of spiral chute for guiding flow. The scraping shell 15 is provided with a plurality of inclined grooves, and the inclined grooves are hardened, so that the scraping service life is prolonged. The inner wall is provided with a plurality of inclined holes for liquid outflow.
Introduction of working principle:
Positive cycle flushing and scraping flushing principle: as shown in fig. 1,2, 3,4, 5. The cleaning liquid with a certain pressure is fed into the inside of the forward and reverse circulation scraping and flushing tool through the oil pipe or the continuous oil pipe, flows into the upper joint 1, and passes through the circulation baffle 26, at this time, the steel ball is hydraulically pressed against the ball seat 7 by the cleaning liquid, and the cleaning liquid cannot flow into the circulation pipe 22. A part of the cleaning fluid flows into the first nozzle 2, washes the well bore obliquely upwards, and another part of the cleaning fluid flows into the annulus between the cleaning fluid and the sliding sleeve 6 through a plurality of inclined holes, namely holes A, of the ball seat 7, and then the cleaning fluid presses down the sliding sleeve 6, so that the spring 9 is compressed. At this time, the holes B, which are the inclined holes in the circulation pipe 22, are opened, and the sliding sleeve 6 is moved downward to close the holes C, which are the holes of the middle lower body 20. The cleaning fluid thus passes through the a-hole, through the B-hole and into the spindle 18. A part of the cleaning liquid flows to the second nozzle 16 to spray and rinse the sand in the well; the other part of the cleaning liquid flows to a plurality of holes of the mandrel 18, namely E holes, and then flows into an annular cavity between the mandrel 18 and the screw shaft 14, and the cleaning liquid with pressure flows to a plurality of screw diversion trenches of the screw shaft 14 to drive the screw shaft 14 to rotate. At this time, torque is transmitted between the screw shaft 14 and the scraping housing 15 by being engaged with the four guide keys. Since the screw shaft 14 is rotated by the hydraulic force of the cleaning liquid, the scraping housing 15 is rotated, and a part of the cleaning liquid is ejected through the inclined holes, i.e., the D holes, formed in the upper surface of the scraping housing 15, so that a certain rotational force is provided to the scraping housing 15, and the well wall is washed. The sand and foreign matter in the well bore is mechanically cleaned by the rotation of the scraping housing 15. The two flat roller bearings 13 provided here make the rotation of the screw shafts 14 at the two places smoother. This is a cycle from inside to outside.
Reverse circulation flushing principle: as shown in fig. 1 and 2. The cleaning solution with a certain pressure flows into the circulating pipe 22 through the annulus between the reverse circulation scraping and flushing tool and the shaft, and the carried sand and other foreign matters pass through the holes, namely the C holes, of the middle lower body 20, and 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 fluid then flows to the ball seat 7, opens the ball 25, and then flows through the holes in the circulation screen 26 to the inside of the reverse circulation scraping flushing tool, where the fluid is delivered to the surface through the tubing or coiled tubing. This is a cycle from outside to inside.
The working process of the invention is as follows:
As shown in fig. 1,2,3,4, 5. The invention aims to scrape and rinse sand in a well bore after fracturing and foreign matters stuck on the well bore, and the operation is divided into two operation modes.
One is a positive cycle shave rinse operation. The cleaning liquid with certain pressure flows into the flushing tool through an oil pipe or a continuous oil pipe, and part of the cleaning liquid washes the shaft through the first nozzle 2; part of the cleaning liquid flows to the hole A of the ball seat 7 through the hole of the circulation baffle 26, presses down the sliding sleeve 6, flows to the hole B of the circulation pipe 22 and then flows to the hole E of the mandrel 18, and the cleaning liquid at the moment has certain pressure to flow through a plurality of spiral diversion grooves of the spiral shaft 14 so as to enable the spiral shaft 14 to rotate, and further drives the scraping shell 15 to rotate, so that the scraping shell mechanically treats sand and foreign matters in a shaft and is cleaned. The liquid in the scraping housing 15 flows out through the D-hole, on the one hand providing it with a rotational power, on the other hand flushing the well wall. A part of the pressurized cleaning fluid flows to a plurality of inclined downward holes of the guide cone 17 to wash the well wall, and a part flows to the second nozzle to perform a vertical downward high-impact cleaning operation.
One is a reverse circulation flushing operation. The cleaning solution with certain pressure flows into the circulating pipe 22 through the annulus between the reverse circulation scraping and flushing tool and the shaft and through the holes C of the middle lower body 20, so that the sliding sleeve 6 is pushed up by the spring 9, and the holes C of the middle lower body 20 are communicated with the circulating pipe. The cleaning fluid then flows to the ball seat 7, opens the ball 25, and then flows through the holes in the circulation screen 26 to the inside of the reverse circulation scraping flushing tool, where the fluid is delivered to the surface through the tubing or coiled tubing. This is a cycle from outside to inside.
Claims (6)
1. The positive and negative circulation scraping and flushing 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 connected in the middle upper body (3) in a sliding manner; 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 second step (29) of the sliding sleeve (6) is slidably connected with a convex ball seat (7), the left end of the ball seat (7) is fixedly connected with a circulating baffle (26), a plurality of through holes are formed in the circulating baffle (26) and are fixedly connected with the middle upper body (3), and the right end of the ball seat (7) is provided with a one-way valve structure; an A hole (30) is formed in the side wall of the ball seat (7), and a side groove (31) communicated with the A hole (30) is formed in 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 B hole (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) 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 connected with a tubular mandrel (18) in a shaft way, a screw shaft (14) is sleeved and fixed outside the mandrel (18), an annular pipe (36) is sleeved outside the screw shaft (14), and a screw 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 a spiral diversion trench (37) of the spiral shaft (14); the mandrel (18) is provided with a hole E (39) communicated with the annular cavity (35); a scraping shell (15) is fixed in the middle of the mandrel (18), a guiding cone (17) is fixed at the right end, and a second nozzle (16) is arranged on the guiding cone (17);
The upper joint (1) is circumferentially provided with a plurality of first nozzles (2) which are obliquely arranged; the elastic device is a spring (9); the check valve structure is a check 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);
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 connected with the upper joint (1) and the middle upper body (3) from loosening; 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 between the sliding sleeve (6) and the circulating pipe (22); the circulating pipe (22) is fixedly connected with the middle lower body (20) through threads;
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 thread loosening between the middle lower body (20) and 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 plane roller bearing (13) is arranged between the upper screw shaft (14) and the middle lower body (20); the bottommost 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 inclined downwards 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 joint (1) through threads, and the first nozzle (2) and the second nozzle (16) can be detached and replaced.
2. The positive and negative cycle scraping and flushing tool as claimed in claim 1, characterized in that a third O-ring (8) is arranged 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.
3. The positive and negative cycle scraping and flushing tool as claimed in claim 1, characterized in that a number of second jackscrews (23) are provided on the intermediate lower body (20), preventing the intermediate upper body (3) from unscrewing from the intermediate lower body (20); a fourth O-ring (10) is arranged on the middle upper body (3) and used 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 between the sliding sleeve and the middle lower body (20); an eighth O-ring (24) is arranged on the ball seat (7) and used 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).
4. The positive and negative circulation scraping and flushing tool as set forth in claim 1, characterized in that 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) to play a linkage role; the other end is provided with a plurality of spiral chute for guiding flow; a plurality of inclined slots are arranged outside the scraping shell (15), and hardening treatment is carried out on the inclined slots; the scraping shell (15) is provided with a plurality of D holes (38) on the inner wall for liquid outflow.
5. A method of using the forward and reverse circulation scraping and flushing tool of claim 1, comprising a forward circulation flushing and scraping method and a reverse circulation flushing operation;
The positive circulation flushing and scraping method comprises the following steps:
The upper joint (1) is communicated with an oil pipe, cleaning liquid is pressed into a forward and reverse circulation scraping and flushing tool, and a part of the cleaning liquid is used for flushing a shaft through a first nozzle (2); part of the oil flows to the hole A of the ball seat (7) through the hole of the circulation baffle (26) to press down the sliding sleeve (6), flows to the hole B of the circulation pipe (22) and then flows to the hole E of the mandrel (18), and flows through the spiral diversion trench of the spiral shaft (14) to enable the spiral shaft (14) to rotate, so that the scraping shell (15) is driven to rotate, and the scraping shell is used for mechanically treating sand and foreign matters in a shaft and cleaning up; the liquid in the scraping shell (15) flows out through the D hole, on one hand, the liquid provides rotating power, on the other hand, the well wall is washed; a part of the pressurized cleaning fluid flows to a plurality of inclined downward holes of the guide cone (17) to wash the well wall, and the other part flows to the second nozzle (16) to perform a vertical downward cleaning operation.
6. The method of using a positive and negative cycle shave flushing tool of claim 5, wherein the step of reverse cycle flushing operation is as follows:
The upper joint (1) is communicated with an oil pipe, negative pressure is formed in the suction positive and negative circulation scraping and flushing tool or cleaning liquid is pressed into the annular space between the positive and negative circulation scraping and flushing tool and a shaft, the cleaning liquid flows carried foreign matters into the circulating pipe (22) through the C hole of the middle lower body (20), at the moment, the sliding sleeve (6) is pushed up by the spring (9), and the C hole of the middle lower body (20) is in a communication state with the circulating pipe; the cleaning liquid then flows to the ball seat (7), opens the steel ball (25), and then flows to the inside of the reverse circulation scraping and flushing tool through the hole on the circulation baffle (26), and the liquid is conveyed to the ground through the oil pipe or the continuous oil pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569172.6A CN111535760B (en) | 2020-06-20 | 2020-06-20 | Forward and reverse circulation scraping and flushing tool and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569172.6A CN111535760B (en) | 2020-06-20 | 2020-06-20 | Forward and reverse circulation scraping and flushing tool and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111535760A CN111535760A (en) | 2020-08-14 |
| CN111535760B true CN111535760B (en) | 2024-08-06 |
Family
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| CN114427383A (en) * | 2020-09-28 | 2022-05-03 | 中国石油化工股份有限公司 | Oil pipe plug removal tool |
| CN114293934B (en) * | 2021-12-31 | 2023-07-21 | 杰瑞能源服务有限公司 | Sand washing pipe column and sand washing process |
| CN114293940B (en) * | 2021-12-31 | 2023-07-18 | 杰瑞能源服务有限公司 | Power device and drilling and grinding tool |
| CN115614000B (en) * | 2022-12-21 | 2023-03-10 | 中国石油集团川庆钻探工程有限公司 | Continuous oil pipe cleaning and scraping integrated tool and cleaning and scraping process |
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| CN103206178A (en) * | 2013-04-01 | 2013-07-17 | 东营鑫华莲石油机械有限公司 | Eccentric rotary guide horizontal well mud cake cleaning device |
| CN108661597B (en) * | 2017-03-28 | 2023-10-24 | 中国石油化工股份有限公司 | Underground operation integrated shaft treatment tool and method |
| US10584559B2 (en) * | 2017-11-21 | 2020-03-10 | Sc Asset Corporation | Collet with ball-actuated expandable seal and/or pressure augmented radially expandable splines |
| CN111287693B (en) * | 2018-12-06 | 2022-06-03 | 中国石油天然气集团有限公司 | Well flushing tool with coiled tubing capable of realizing positive and negative circulation |
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