Casing pipe wall cleaning tool

Abstract

The utility model discloses a sleeve wall cleaning tool which comprises a connector, a mandrel connected with the connector, a fixing sleeve, a scraper structure and a centralizing sleeve, wherein the fixing sleeve, the scraper structure and the centralizing sleeve are sequentially arranged on the mandrel in a sleeving mode. The fixing sleeve, the scraper structure and the centralizing sleeve are sequentially connected and can rotate. According to the sleeve wall cleaning tool, the fixing sleeve, the scraper structure and the centralizing sleeve can rotate, in the process that the sleeve wall cleaning tool moves up and down in a sleeve, when the blade is blocked by large or hard attachments, the cutting board base can properly rotate according to the shapes of the attachments, and therefore resistance is reduced; meanwhile, due to the fact that spiral teeth are arranged on the outer wall of the centralizing sleeve, the fixing sleeve, the scraper structure and the centralizing sleeve integrally rotate under the guidance of the spiral teeth in the vertical moving process of the casing pipe wall cleaning tool, and when the scraper structure rotates, blades on the scraper structure cut the attachments so as to clean the attachments. In the process, the force borne by the mandrel can be reduced, and the mandrel is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field tools, in particular to a casing wall cleaning tool. Background Art

[0002] The primary purpose of a casing cleaning tool is to remove debris from the inner wall of downhole casing, keeping it clean and facilitating the insertion of various downhole tools. Existing casing cleaning tools have a blade holder fixed to a mandrel. The tool is lowered into the casing with a tool. As the tool is moved up and down, the scraper on the blade holder removes debris from the inner wall. However, because the blade holder is fixed to the mandrel, large, hard debris can create significant resistance between the blade holder and mandrel, potentially damaging the mandrel. Utility Model Content

[0003] In order to solve the above problems, the present application provides a casing wall cleaning tool.

[0004] The purpose of the utility model is achieved through the following technical solution: a casing wall cleaning tool, comprising a joint, a core shaft connected to the joint, a fixed sleeve, a scraper structure and a straightening sleeve sequentially sleeved on the core shaft; the fixed sleeve, scraper structure and straightening sleeve are sequentially connected and can rotate;

[0005] Among them, annular mounting grooves are provided between the fixing sleeve and the core shaft, and between the straightening sleeve and the core shaft. Steel balls are installed in the annular mounting grooves, and sealing rings are provided on both sides of the annular mounting grooves.

[0006] Furthermore, the fixing sleeve and the straightening sleeve are both provided with threaded holes connected to the annular mounting groove, and locking screws are installed on the threaded holes; the diameter of the threaded holes is larger than the diameter of the steel balls.

[0007] Furthermore, a plurality of spiral teeth extending along the axial direction of the outer wall of the centralizing sleeve are circumferentially provided, and a spiral groove is formed between two adjacent spiral teeth.

[0008] Furthermore, the scraper structure includes two scraper assemblies and a positioning ring connecting the two scraper assemblies; an annular mounting groove is provided between the positioning ring and the core shaft, a steel ball is installed in the annular mounting groove, and sealing rings are respectively provided on both sides of the annular mounting groove.

[0009] The positioning ring is provided with a threaded hole connected to the annular mounting groove, and a locking screw is installed on the threaded hole; the diameter of the threaded hole is larger than the diameter of the steel ball.

[0010] The scraper assembly comprises a blade seat sleeved on the outside of the core shaft and at least two groups of blade assemblies axially arranged on the outer wall of the blade seat.

[0011] The blade assembly comprises three blades which are circumferentially spaced and distributed on the outer wall of the blade seat, and the blades on two adjacent blade assemblies are staggered.

[0012] An installation cavity is provided on the outer wall of the blade seat, and the blade is installed in the installation cavity through a spring so that the blade can be extended and retracted in the radial direction of the blade seat.

[0013] As a preferred solution, the teeth on the blade are distributed in a spiral shape.

[0014] As a preferred solution, a pin is provided at the connection between the joint and the core shaft.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] (1) The fixed sleeve, scraper structure and straightening sleeve of the utility model can rotate. When the casing wall cleaning tool moves up and down in the casing, when the blade encounters a larger or harder attachment, the blade seat can rotate appropriately according to the shape of the attachment, thereby reducing the resistance; at the same time, since the outer wall of the straightening sleeve is provided with spiral teeth, when the casing wall cleaning tool moves up and down, under the guidance of the spiral teeth, the fixed sleeve, scraper structure and straightening sleeve rotate as a whole. When the scraper structure rotates, the blade on it cuts the attachment to clean the attachment. In this process, the force on the core shaft can be reduced to prevent the core shaft from being damaged.

[0017] (2) Steel balls are provided between the fixed sleeve, scraper structure, and straightening sleeve and the core shaft of the utility model to enable the fixed sleeve, scraper structure, and straightening sleeve to rotate smoothly; at the same time, sealing rings are provided on both sides of the steel balls to prevent foreign matter such as mud from entering between the fixed sleeve, scraper structure, and straightening sleeve and the core shaft during operation, thereby preventing the fixed sleeve, scraper structure, and straightening sleeve from getting stuck.

[0018] (3) The teeth on the blade of the utility model are distributed in a spiral shape, which is conducive to the return of mud to take away the scraped debris.

[0019] Some additional features of the present application may be described in the following description. Some additional features of the present application will be apparent to those skilled in the art from an inspection of the following description and accompanying drawings, or from a thorough understanding of the production or operation of the embodiments. The features disclosed in this application may be realized and achieved through the practice or use of the various methods, means, and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numerals represent the same components.

[0021] Figure 1 This is a structural diagram of the utility model.

[0022] Figure 2 It is a cross-sectional view of the present utility model.

[0023] The reference numerals in the above drawings are: 1-connector, 2-pin, 3-fixing sleeve, 4-steel ball, 5-slot, 6-blade seat, 7-blade, 8-straightening sleeve, 9-spiral tooth, 10-core shaft, 11-sealing ring, 12-locking screw, 13-spring, 14-locating ring, 15-spiral groove. DETAILED DESCRIPTION

[0024] In order to enable people in this technical field to better understand the solution of this application, the technical solution in the embodiment of this application will be clearly and completely described below in combination with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all of the embodiments.

[0025] Example

[0026] like Figure 1 、 2 As shown, this embodiment discloses a casing wall cleaning tool, comprising a connector 1, a core shaft 10, a fixing sleeve 3, a scraper structure, and a straightening sleeve 8. The connector 1 is threadedly connected to the core shaft 10, and the connection between the two is also fixed by a pin 2 to prevent the connector 1 from separating from the core shaft 10 when the casing wall cleaning tool moves up and down in the casing.

[0027] The fixed sleeve 3, scraper structure, and centralizing sleeve 8 are sequentially mounted on the core shaft 10 and connected in sequence. The fixed sleeve 3, scraper structure, and centralizing sleeve 8 are all fitted with a clearance fit on the core shaft 10, allowing the fixed sleeve 3, scraper structure, and centralizing sleeve 8 to rotate on the core shaft 10.

[0028] Specifically, a step is provided on the core shaft 10 so that the core shaft 10 is thicker at the front and thinner at the back. During installation, the thin end of the core shaft 10 is passed through the straightening sleeve 8, the scraper structure and the fixed sleeve 3 in sequence and then screwed into the joint 1. The joint 1 and the core shaft 10 are then fixed by the pin 2. In this way, the fixed sleeve 3, the scraper structure and the straightening sleeve 8 are limited between the step of the core shaft 10 and the end of the joint 1. Figure 2 shown.

[0029] In addition, annular mounting grooves are provided between the fixing sleeve 3 and the core shaft 10 and between the straightening sleeve 8 and the core shaft 10 . Steel balls 4 are installed in the annular mounting grooves, and sealing rings 11 are provided on both sides of the annular mounting grooves.

[0030] Specifically, an annular semicircular groove is provided on the inner wall of the fixed sleeve 3 and the outer wall of the core shaft 10. The two semicircular grooves together enclose the above-mentioned annular mounting groove. The diameter of the steel ball 4 is slightly larger than the cross-sectional diameter of the annular mounting groove. Therefore, under the action of the steel ball 4, the fixed sleeve 3 can rotate smoothly on the core shaft 10. Similarly, the mounting groove between the straightening sleeve 8 and the core shaft 10 and the installation method of the steel ball 4 are the same as described above and will not be repeated. A sealing ring 11 is provided on both sides of the steel ball 4, which can prevent foreign matter such as mud from entering the fixed sleeve 3, the scraper structure, and the space between the straightening sleeve 8 and the core shaft 10 during operation, thereby preventing the fixed sleeve 3, the scraper structure, and the straightening sleeve 8 from getting stuck.

[0031] The above structure connects the fixed sleeve 3, scraper structure, and the stabilizing sleeve 8, allowing them to rotate together. Specifically, the scraper structure, fixed sleeve 3, and stabilizing sleeve 8 can be connected by threaded or plug-in connections. For example, the scraper structure can have multiple inserts spaced circumferentially at each end, while the connection between the fixed sleeve 3 and the stabilizing sleeve 8 has multiple slots circumferentially disposed. The inserts at each end of the scraper structure can be inserted into corresponding slots on the fixed sleeve 3 and the stabilizing sleeve 8, respectively, allowing the three to rotate together.

[0032] In addition, both the fixing sleeve 3 and the stabilizing sleeve 8 are provided with threaded holes that communicate with the annular mounting groove, and locking screws 12 are installed in these threaded holes; the diameter of these threaded holes is larger than the diameter of the steel ball 4. Therefore, when the casing wall cleaning tool needs to be disassembled, the pin 2 is first removed, and then the core shaft 10 is removed from the joint 1. Then, the locking screws 12 on the fixing sleeve 3 and the stabilizing sleeve 8 are removed, and the steel ball 4 is poured out of the threaded holes. Finally, the fixing sleeve 3, the scraper structure, and the stabilizing sleeve 8 are removed from the core shaft 10.

[0033] like Figure 1 As shown, the outer wall of the straightening sleeve 8 is circumferentially provided with a plurality of spiral teeth 9 extending in its axial direction, and a spiral groove 15 is formed between two adjacent spiral teeth 9. The diameter of the straightening sleeve 8 matches the inner diameter of the casing, so it can straighten the casing wall cleaning tool. In addition, when the casing wall cleaning tool moves up and down in the casing, due to the obstruction of the attachment, the straightening sleeve 8 drives the scraper structure and the fixed sleeve 3 to rotate under the guidance of the spiral teeth 9, and the scraper structure can cut the attachment. In addition, a spiral groove 15 is formed on the outer wall of the straightening sleeve 8. During underground operations, mud can rise along the spiral groove 15 and fully flush the blades on the scraper structure.

[0034] In addition, if Figure 2 As shown, the scraper structure includes two scraper assemblies and a positioning ring 14 connecting the two scraper assemblies. Similarly, the positioning ring 14 and the two scraper assemblies can also be connected by the above-mentioned insertion piece and slot 5 matching mode.

[0035] Similarly, an annular mounting groove is provided between the positioning ring 14 and the core shaft 10, in which a steel ball 4 is mounted. Furthermore, a sealing ring 11 is provided on either side of the annular mounting groove. The annular mounting groove and the steel ball 4 between the positioning ring 14 and the core shaft 10 are arranged in the same manner as the annular mounting groove and the steel ball 4 between the fixing sleeve 3 and the core shaft 10.

[0036] Similarly, the positioning ring 14 is provided with a threaded hole connected to the annular mounting groove, and a locking screw 12 is installed in the threaded hole; the diameter of the threaded hole is larger than the diameter of the steel ball 4. When disassembling the scraper structure, the steel ball 4 can be poured out from the threaded hole and the two scraper assemblies can be removed.

[0037] Specifically, the scraper assembly includes a blade seat 6 sleeved on the outside of the core shaft 10, and at least two sets of blade assemblies axially arranged on the outer wall of the blade seat 6. In this embodiment, the blade assemblies are arranged in two sets. The blade assembly includes three blades 7 circumferentially spaced and distributed on the outer wall of the blade seat 6, and the blades 7 on two adjacent blade assemblies are staggered. That is, the three blades 7 on a blade assembly are evenly distributed circumferentially on the blade seat 6, and a gap is formed between two adjacent blades 7. The three blades 7 on the adjacent blade assembly correspond to the three gaps one by one, respectively. This ensures that the blades 7 on the scraper assembly can cut the attachments on the inner wall of the casing 360 degrees along the entire inner diameter. In addition, the staggered arrangement of the blades 7 on two adjacent blade assemblies can enable the mud to return smoothly, and the impurities cut off can be returned with the mud.

[0038] Furthermore, the outer wall of the blade holder 6 is provided with a mounting cavity, within which the blade 7 is mounted via a spring 13, enabling the blade 7 to extend and retract radially in the blade holder 6. When the casing wall cleaning tool is not lowered into the casing, the maximum outer diameter of the scraper assembly is greater than the inner diameter of the casing. Once the casing wall cleaning tool is lowered into the casing, the blade 7 is compressed, and under the action of the spring 13, the blade 7 is pressed against the inner wall of the casing. This arrangement, which enables the blade 7 to extend and retract radially in the blade holder 6, is common in conventional casing wall cleaning tools and is part of the prior art, and will not be elaborated upon here.

[0039] In addition, the teeth on the blade 7 are distributed in a spiral shape, which is conducive to the return of mud to take away the scraped debris.

[0040] The fixed sleeve 3, scraper structure and straightening sleeve 8 of the utility model can rotate. When the casing wall cleaning tool moves up and down in the casing, when the blade 7 encounters a larger or harder attachment, the knife plate seat 6 can rotate appropriately according to the shape of the attachment, thereby reducing the resistance; at the same time, since the outer wall of the straightening sleeve 8 is provided with spiral teeth 9, when the casing wall cleaning tool moves up and down, under the guidance of the spiral teeth 9, the fixed sleeve 3, scraper structure and straightening sleeve 8 rotate as a whole, and the blade 7 on the scraper structure cuts the attachment when it rotates to clean the attachment. In this process, the force on the core shaft can be reduced to prevent the core shaft from being damaged.

[0041] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0042] In addition, the above-mentioned specific embodiments are merely illustrative. Those skilled in the art may devise various solutions based on the disclosure of this utility model, and such solutions fall within the scope of disclosure and the scope of protection of this utility model. Those skilled in the art should understand that the specification and drawings of this utility model are illustrative and do not constitute limitations of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A casing wall cleaning tool, characterized in that: It comprises a joint (1), a core shaft (10) connected to the joint (1), a fixed sleeve (3), a scraper structure and a straightening sleeve (8) which are sequentially sleeved on the core shaft (10); the fixed sleeve (3), the scraper structure and the straightening sleeve (8) are sequentially connected and rotatable; Annular mounting grooves are provided between the fixing sleeve (3) and the core shaft (10) and between the straightening sleeve (8) and the core shaft (10), steel balls (4) are installed in the annular mounting grooves, and sealing rings (11) are provided on both sides of the annular mounting grooves.

2. The casing wall cleaning tool according to claim 1, characterized in that: The fixing sleeve (3) and the straightening sleeve (8) are both provided with threaded holes communicating with the annular mounting groove, and locking screws (12) are installed on the threaded holes; the diameter of the threaded holes is larger than the diameter of the steel ball (4).

3. The casing wall cleaning tool according to claim 1, characterized in that: The outer wall of the centralizing sleeve (8) is circumferentially provided with a plurality of spiral teeth (9) extending in the axial direction thereof, and a spiral groove (15) is formed between two adjacent spiral teeth (9).

4. The casing wall cleaning tool according to any one of claims 1 to 3, characterized in that: The scraper structure comprises two scraper assemblies and a positioning ring (14) connecting the two scraper assemblies; an annular mounting groove is provided between the positioning ring (14) and the core shaft (10), a steel ball (4) is installed in the annular mounting groove, and sealing rings (11) are respectively provided on both sides of the annular mounting groove.

5. The casing wall cleaning tool according to claim 4, characterized in that: The positioning ring (14) is provided with a threaded hole communicating with the annular mounting groove, and a locking screw (12) is installed on the threaded hole; the diameter of the threaded hole is larger than the diameter of the steel ball (4).

6. The casing wall cleaning tool according to claim 4, characterized in that: The scraper assembly comprises a blade seat (6) sleeved on the outside of the core shaft (10), and at least two sets of blade assemblies axially arranged on the outer wall of the blade seat (6).

7. The casing wall cleaning tool according to claim 6, characterized in that: The blade assembly comprises three blades (7) distributed circumferentially and spaced apart on the outer wall of the blade plate seat (6), and the blades (7) on two adjacent blade assemblies are staggered.

8. The casing wall cleaning tool according to claim 7, characterized in that: An installation cavity is provided on the outer wall of the blade seat (6), and the blade (7) is installed in the installation cavity via a spring (13) so that the blade (7) can be extended and retracted in the radial direction of the blade seat (6).

9. The casing wall cleaning tool according to claim 7, characterized in that: The teeth on the blade (7) are distributed in a spiral shape.

10. The casing wall cleaning tool according to claim 1, characterized in that: A pin (2) is provided at the connection between the joint (1) and the core shaft (10).

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