Integral type pipe scraper with rotatable cutter cage

Abstract

The utility model discloses an integral knife cage rotatable pipe scraper, which comprises a mandrel, two ends of the mandrel are respectively connected with an upper joint and a lower joint, and an upper helical casing, an integral scraper and a lower helical casing are sequentially sleeved outside the mandrel between the upper joint and the lower joint. The upper spiral sleeve and the lower spiral sleeve are each provided with a supporting and limiting structure. The supporting and limiting structure comprises a supporting sleeve arranged on the inner side of the spiral sleeve, and a thrust ring and a limiting ring which are arranged at the two ends of the spiral sleeve. Various dirt, rust and accumulated objects remaining on the inner wall of a casing pipe are removed through up-down movement, up-down action and rotation of the integral scraper, cleaning of the inner wall of the casing pipe is achieved, and it is guaranteed that the well wall is clean and intact; the complex structure of a traditional rotary pipe scraper is broken through, the scraper blade is designed to be integrated, the size is small, the structure is simpler, the pipe scraper is more convenient to operate and better in cleaning effect, the maintenance period is shortened, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing cleaning equipment, and particularly relates to an integral cutter cage rotatable pipe scraper. Background Art

[0002] A casing is a steel pipe used to support the wellbore of an oil or gas well to ensure the smooth progress of the drilling process and the normal operation of the entire oil well after completion. After long-term use, various dirt, rust and deposits will adhere to the inner wall of the pipeline, affecting the service life of the casing, and further reducing the production efficiency and safety of the oilfield. At present, there are various pipe scrapers on the market, but most of them have complex structures, cumbersome operations, and unsatisfactory cleaning effects. Encountering stubborn dirt will even affect normal use. Therefore, it is necessary to develop a pipe scraper for casing with a simple structure, convenient operation and good cleaning effect. Summary of the Utility Model

[0003] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide an integral cutter cage rotatable pipe scraper.

[0004] The utility model is realized through the following technical solutions:

[0005] An integral cutter cage rotatable pipe scraper includes a mandrel. Upper and lower sub - joints are respectively connected to both ends of the mandrel. An upper spiral sleeve, an integral cutter and a lower spiral sleeve are sequentially sleeved outside the mandrel between the upper and lower sub - joints; an upper thrust ring is arranged between the upper spiral sleeve and the upper sub - joint; an upper support sleeve is arranged between the upper spiral sleeve and the mandrel. An upper limit ring is arranged at the lower sub - joint end of the upper support sleeve. The upper limit ring is in close contact with the end face of the lower sub - joint end of the upper spiral sleeve, and the upper limit ring is placed between the integral cutter and the mandrel; a lower thrust ring is arranged between the lower spiral sleeve and the lower sub - joint; a lower support sleeve is arranged between the lower spiral sleeve and the mandrel. A lower limit ring is arranged at the upper sub - joint end of the lower support sleeve. The lower limit ring is in close contact with the end face of the upper sub - joint end of the lower spiral sleeve, and the lower limit ring is placed between the integral cutter and the mandrel.

[0006] In the above technical solution, the mandrel is a cylindrical structure with a through - hole formed in the middle, and upper and lower convex rings are respectively formed on the outer wall of the mandrel.

[0007] In the above technical solution, end - seal grooves are respectively formed on both end faces of the mandrel, and side - seal grooves are respectively formed on the outer walls at the connection parts of the mandrel with the upper and lower sub - joints.

[0008] In the above technical solution, an upper - end - face sealing ring is arranged in the end - seal groove on the upper end face of the mandrel; a lower - end - face sealing ring is arranged in the end - seal groove on the lower end face of the mandrel; an upper - side sealing ring is arranged in the side - seal groove at the upper sub - joint end, and a lower - side sealing ring is arranged in the side - seal groove at the lower sub - joint end.

[0009] In the above technical solution, thrust ring grooves are formed at the positions of the outer wall of the mandrel corresponding to the upper thrust ring and the lower thrust ring.

[0010] In the above technical solution, one end of the upper limit ring is closely attached to the upper convex ring; one end of the lower limit ring is closely attached to the lower convex ring.

[0011] In the above technical solution, both the upper spiral sleeve and the lower spiral sleeve are sleeve structures, and a plurality of spiral water grooves are evenly distributed along the circumference of the outer wall, and the spiral directions of the spiral water grooves of the upper spiral sleeve and the lower spiral sleeve are opposite.

[0012] In the above technical solution, both ends of the integral scraper are inserted into the upper spiral sleeve and the lower spiral sleeve respectively, and an upper limit sleeve is arranged between the integral scraper and the upper support sleeve; a lower limit sleeve is arranged between the integral scraper and the lower support sleeve.

[0013] In the above technical solution, the integral scraper includes a cutter cage and scraping blades spirally wound around the middle of the cutter cage; the cutter cage is sleeve-shaped, and a plurality of evenly distributed notches are formed at both ends along the circumference; a plurality of scraper grooves evenly distributed along the circumference are arranged on the cutter cage, the scraper grooves are Z-shaped and span the scraping blades; intervals are arranged between each circle of the spirally wound scraping blades, and spiral water grooves are formed on the intervals.

[0014] In the above technical solution, the upper joint and the mandrel are connected by trapezoidal threads and fixed by a plurality of upper set screws evenly distributed along the circumference; the lower joint and the mandrel are connected by trapezoidal threads and fixed by a plurality of lower set screws evenly distributed along the circumference; both the upper set screws and the lower set screws are internal hexagonal flat-end set screws.

[0015] The beneficial effects of the present utility model are:

[0016] The present utility model provides an integral cutter cage rotatable pipe scraper, which moves up and down, utilizes the up and down actions and the rotation of the integral scraping blades to remove various dirt, rust and deposits remaining on the inner wall of the casing, realizes the cleaning of the inner wall of the casing, and ensures the cleanliness and integrity of the well wall; the present utility model breaks the complex structure of the traditional rotary pipe scraper, the scraping blades are designed as a whole, with smaller size and simpler structure, making the pipe scraper more convenient to operate, with better cleaning effect, and reducing the maintenance period and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a sectional view of the present utility model;

[0018] Figure 2 is a three-dimensional view of the present utility model;

[0019] Figure 3 is a schematic structural view of the mandrel in the present utility model;

[0020] Figure 4 This is a three-dimensional view of the integral scraper in the present utility model.

[0021] Among them:

[0022] 1. Upper joint; 2. Mandrel; 21. End seal groove; 22. Side seal groove; 23. Upper convex ring; 24. Lower convex ring; 31. Upper thrust ring; 32. Lower thrust ring; 41. Upper support sleeve; 42. Lower support sleeve; 51. Upper limit ring; 52. Lower limit ring; 61. Upper limit sleeve; 62. Lower limit sleeve; 7. Integral scraper; 71. Knife cage; 711. Notch; 712. Scraper groove; 72. Scraper blade; 721. Spiral water groove; 8. Upper spiral sleeve; 9. Lower spiral sleeve; 10. Lower joint; 111. Upper set screw; 112. Lower set screw; 121. Upper end face sealing ring; 122. Lower end face sealing ring; 131. Upper side sealing ring; 132. Lower side sealing ring.

[0023] For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on the above drawings. Detailed implementation mode

[0024] In order to enable those in the technical field to better understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings in the specification and through specific implementation modes.

[0025] As Figure 1 , 2 shown, an integral knife cage rotatable pipe scraper includes a mandrel 2, with an upper joint 1 and a lower joint 10 respectively connected to both ends of the mandrel 2. An upper spiral sleeve 8, an integral scraper 7 and a lower spiral sleeve 9 are sequentially sleeved outside the mandrel 2 between the upper joint 1 and the lower joint 10; both the upper spiral sleeve 8 and the lower spiral sleeve 9 are provided with support and limit structures; the support and limit structure includes support sleeves arranged inside the spiral sleeves, as well as thrust rings and limit rings arranged at both ends of the spiral sleeves. The support and limit structure is specifically:

[0026] An upper thrust ring 31 is arranged between the upper spiral sleeve 8 and the upper joint 1; an upper support sleeve 41 is arranged between the upper spiral sleeve 8 and the mandrel 2. An upper limit ring 51 is arranged at the lower joint end of the upper support sleeve 41. The upper limit ring 51 is in close contact with the end face of the lower joint end of the upper spiral sleeve 8, and the upper limit ring 51 is placed between the integral scraper 7 and the mandrel 2

[0027] A lower thrust ring 32 is arranged between the lower spiral sleeve 9 and the lower joint 10; a lower support sleeve 42 is arranged between the lower spiral sleeve 9 and the mandrel 2. A lower limit ring 52 is arranged at the upper joint end of the lower support sleeve 42. The lower limit ring 52 is in close contact with the end face of the upper joint end of the lower spiral sleeve 9, and the lower limit ring 52 is placed between the integral scraper 7 and the mandrel 2;

[0028] As Figure 3 shown, the mandrel 2 is a cylindrical structure with a through hole formed in the middle, end sealing grooves 21 are formed on both end faces, and edge sealing grooves 22 are formed on the outer walls at the joints of the mandrel 2 with the upper joint 1 and the lower joint 10; upper convex rings 23 and lower convex rings 24 are respectively formed on the outer wall of the mandrel 2; thrust ring grooves 25 are formed at the positions of the upper thrust ring 31 and the lower thrust ring 32 on the outer wall of the mandrel 2;

[0029] An upper end face sealing ring 121 is arranged in the end sealing groove 21 on the upper end face of the mandrel 2; a lower end face sealing ring 122 is arranged in the end sealing groove 21 on the lower end face of the mandrel 2; an upper side sealing ring 131 is arranged in the edge sealing groove 22 at the upper joint end, and a lower side sealing ring 132 is arranged in the edge sealing groove 22 at the lower joint end. The arrangement of the edge sealing rings and the end sealing rings realizes the sealing between the mandrel 2 and the upper joint 1 and the lower joint 10;

[0030] One end of the upper limit ring 51 abuts against the upper convex ring 23; one end of the lower limit ring 52 abuts against the lower convex ring 24;

[0031] Both the upper spiral sleeve 8 and the lower spiral sleeve 9 are sleeve structures, and a plurality of spiral water grooves are evenly distributed along the circumference of the outer wall, and the spiral directions of the spiral water grooves of the upper spiral sleeve 8 and the lower spiral sleeve 9 are opposite;

[0032] As Figure 1 、 4 shown, both ends of the integral scraper 7 are inserted into the upper spiral sleeve 8 and the lower spiral sleeve 9 respectively, and an upper limit sleeve 61 is arranged between the integral scraper 7 and the upper support sleeve 41; a lower limit sleeve 62 is arranged between the integral scraper 7 and the lower support sleeve 42;

[0033] The integral scraper 7 includes a cutter cage 71 and a blade 72 spirally wound around the middle of the cutter cage 71;

[0034] The cutter cage 71 is sleeve-shaped, and a plurality of notches 711 evenly distributed along the circumference are formed at both ends. The design of the notches 711 facilitates the insertion of the integral scraper 7 into the upper spiral sleeve 8 and the lower spiral sleeve 9;

[0035] A plurality of scraper grooves 712 evenly distributed along the circumference are formed on the cutter cage 71. The scraper grooves 712 are Z-shaped, and expansion grooves are formed at both ends of the scraper grooves 712; the scraper grooves 712 straddle the blade 72;

[0036] Intervals are arranged between each turn of the spirally wound blade 72, and spiral water grooves 721 are formed in the intervals;

[0037] The integral scraper 7 is made of a high-strength wear-resistant material and is surface-treated specially, and the scraper groove is an integral structure of a spiral groove.

[0038] The upper adapter 1 and the mandrel 2 are connected by trapezoidal threads and fixed by a plurality of upper set screws 111 evenly distributed along the circumference.

[0039] The lower adapter 10 and the mandrel 2 are connected by trapezoidal threads and fixed by a plurality of lower set screws 112 evenly distributed along the circumference.

[0040] Both the upper set screws 111 and the lower set screws 112 are hex socket flat end set screws.

[0041] In this application, by moving up and down, using the up and down action and the rotation of the integral scraper blade to remove various dirt, rust and deposits remaining on the inner wall of the casing, so as to ensure the cleanliness and integrity of the well wall.

[0042] The usage method of the utility model:

[0043] By moving the utility model up and down, the integral scraper expands and contracts inside and outside according to the thickness of the dirt on the inner wall of the casing, so as to realize the layer-by-layer scraping of various dirt, rust and deposits, etc., so as to ensure the cleanliness and integrity of the well wall.

[0044] During the working process, there will be dirt with large adhesion and volume, which is difficult to clean. Since the scraping groove of the integral scraper is spiral, at this time, the spiral structure and the relative rotation of the scraper are used to keep working; at the same time, the integral scraper is designed with enough water grooves on the premise of ensuring strength, increasing the flow area and improving the cleaning effect; the water grooves of the upper and lower spiral sleeves are spiral water grooves. On the premise of ensuring strength, the design of the water grooves is increased, so that relatively large debris scraped off can also easily pass through. Above, work in this way repeatedly until the dirt is cleaned up.

[0045] Variable diameter design: There are gaps between the two ends of the scraper cage 71 and the upper support sleeve 41 and the lower support sleeve 42. The scraper cage 71 has a rigid structure and 711 notches and 712 scraper grooves. When the scraper blade 72 is extruded, the cage 71 reduces in diameter, and both ends extend upward and downward to the upper and lower support sleeves 41 and 42, and the 711 notches and 712 scraper grooves release stress to realize diameter reduction; when the extrusion force on the scraper blade 72 decreases, the cage 71 returns to its original position under the action of its own rigid force to realize diameter expansion.

[0046] The utility model provides an integral cutter cage rotatable pipe scraper, which has a small outer diameter size and is suitable for small-sized casing pipes. The integral cutter blade is of an integral structure, which can change diameter and rotate relative to the mandrel. The cutter blade groove is spiral. The body is made of high-strength wear-resistant material after special treatment. It has a simple structure, convenient operation and good cleaning effect. It can quickly and smoothly remove dirt, rust and deposits on the inner wall of the pipeline, ensure the uniformity and efficiency of cleaning, and reduce the maintenance period and cost. The water grooves of the upper and lower spiral sleeves are of spiral design. On the premise of ensuring strength, the size of the spiral water grooves is increased, making it easier for large-sized debris to pass through. The integral cutter cage rotatable pipe scraper rotates with the drill, effectively avoiding damage to the casing pipe by the pipe scraper. While rotating with the drill, it can effectively transmit torque to complete the operations of drilling out the cement plug and scraping and washing the well in one trip. The cutter cage and the cutter blade are of integral design, with reliable strength, effectively avoiding the risk of accidental detachment of the cutter blade. The cutter cage is of annular shape and the cutter blades are staggered. The scraping surface can fully cover the inner wall of the wellbore. The cutter blades are designed with left-handed helical lines and the cutter blade grooves are approximately right-angled, with good scraping performance. The cutter blades are of straight plate design and the scraping direction is consistent with the wellbore, effectively avoiding the risks of reverse threading and unthreading. The cutter cage can be telescopically variable in diameter and can be telescoped according to the thickness of the dirt to achieve layer-by-layer scraping of the dirt. The cutter cage can rotate independently on the mandrel or rotate together with the contact support sleeve, with a dual rotation mode and good rotation effect. Under special working conditions such as eccentric wear, the cutter cage contacts the centralizer sleeve and rotates together, effectively avoiding scratching the casing pipe when the cutter cage is stuck. It has a large water eye, small friction resistance and large flow rate. The cutter cage has large water groove size and the cutter blades are designed with spiral water grooves, leaving enough annular flow channels. It can effectively reduce the pressure drop, reduce the pump pressure, increase the circulation displacement, and improve the liquid return and flushing effects.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0048] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0049] The applicant declares that the above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present utility model fall within the protection scope and the disclosure scope of the present utility model.

Claims

1. An integral knife cage rotatable pipe scraper, characterized in that: The invention comprises a core shaft (2), wherein the two ends of the core shaft (2) are respectively connected to an upper joint (1) and a lower joint (10); an upper spiral sleeve (8), an integral scraper (7) and a lower spiral sleeve (9) are sequentially sleeved on the outside of the core shaft (2) between the upper joint (1) and the lower joint (10); an upper thrust ring (31) is arranged between the upper spiral sleeve (8) and the upper joint (1); an upper support sleeve (41) is arranged between the upper spiral sleeve (8) and the core shaft (2); an upper limit ring (51) is arranged at the lower joint end of the upper support sleeve (41); the upper limit ring (51) and the upper spiral sleeve (8) are sleeved together; The end face of the lower joint of the rotary sleeve (8) is in close contact with the end face, and an upper limit ring (51) is placed between the integral scraper (7) and the mandrel (2); a lower thrust ring (32) is arranged between the lower spiral sleeve (9) and the lower joint (10); a lower support sleeve (42) is arranged between the lower spiral sleeve (9) and the mandrel (2), a lower limit ring (52) is arranged at the upper joint end of the lower support sleeve (42), the lower limit ring (52) is in close contact with the end face of the upper joint of the lower spiral sleeve (9), and the lower limit ring (52) is placed between the integral scraper (7) and the mandrel (2).

2. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: The core shaft (2) is a columnar structure with a through hole formed in the middle, and an upper convex ring (23) and a lower convex ring (24) are respectively formed on the outer wall of the core shaft (2).

3. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: End sealing grooves (21) are formed on both end faces of the core shaft (2), and side sealing grooves (22) are formed on the outer walls of the connection between the core shaft (2) and the upper joint (1) and the lower joint (10).

4. The integral knife cage rotatable pipe scraper according to claim 3, characterized in that: An upper end face sealing ring (121) is arranged in the end sealing groove (21) on the upper end face of the core shaft (2); a lower end face sealing ring (122) is arranged in the end sealing groove (21) on the lower end face of the core shaft (2); an upper side sealing ring (131) is arranged in the side sealing groove (22) on the upper joint end, and a lower side sealing ring (132) is arranged in the side sealing groove (22) on the lower joint end.

5. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: Thrust ring grooves (25) are formed on the outer wall of the core shaft (2) at positions corresponding to the upper thrust ring (31) and the lower thrust ring (32).

6. The integrated knife cage rotatable pipe scraper according to claim 2, characterized in that: One end of the upper limit ring (51) is in close contact with the upper convex ring (23); and one end of the lower limit ring (52) is in close contact with the lower convex ring (24).

7. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: The upper spiral sleeve (8) and the lower spiral sleeve (9) are both sleeve structures, and a plurality of spiral water grooves are evenly distributed along the circumference of the outer wall, and the spiral water grooves of the upper spiral sleeve (8) and the lower spiral sleeve (9) have opposite rotation directions.

8. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: The two ends of the integral scraper (7) are respectively inserted into an upper spiral sleeve (8) and a lower spiral sleeve (9), and an upper limit sleeve (61) is arranged between the integral scraper (7) and the upper support sleeve (41); and a lower limit sleeve (62) is arranged between the integral scraper (7) and the lower support sleeve (42).

9. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: The integrated scraper (7) comprises a blade cage (71) and a scraper blade (72) spirally wound around the middle of the blade cage (71); the blade cage (71) is sleeve-shaped, and both ends are formed with a plurality of notches (711) evenly distributed along the circumference; the blade cage (71) is provided with a plurality of scraper grooves (712) evenly distributed along the circumference, the scraper grooves (712) are Z-shaped and span the scraper blade (72); intervals are provided between each turn of the spirally wound scraper blade (72), and spiral water grooves (721) are formed on the intervals.

10. The integrated knife cage rotatable pipe scraper according to claim 1, characterized in that: The upper joint (1) is connected to the core shaft (2) via a trapezoidal thread and is fixed via a plurality of upper set screws (111) evenly distributed along the circumference; the lower joint (10) is connected to the core shaft (2) via a trapezoidal thread and is fixed via a plurality of lower set screws (112) evenly distributed along the circumference; the upper set screw (111) and the lower set screw (112) are both hexagon socket flat-end set screws.

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