Sleeve centralizing and milling cylinder
By setting rollers and welded milling teeth of tungsten carbide material on the sleeve milling barrel, the problem of high friction force of the existing sleeve milling barrel is solved, and faster sleeve milling speed and higher working efficiency are achieved.
Patent Information
- Application Number
- CN202422187322.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The existing sleeve milling barrel lacks a straightening mechanism, which leads to high friction between the inner wall of the sleeve and the outer wall of the sleeve, resulting in insufficient operational power and slow sleeve milling speed, which affects the operation progress of the oil well replacement sleeve.
A sleeve-adjusting sleeve milling cylinder is designed, and rollers are arranged on the sleeve milling head to make the sleeve rollers roll in contact with the outer wall of the sleeve, reduce friction, and weld tungsten carbide steel material on the milling teeth to improve strength and crushing ability.
By reducing friction, the sleeve milling speed is improved, the sleeve milling cylinder is strengthened, and the progress and efficiency of the oil well replacement sleeve operation is improved.
Smart Images
Figure CN223004003U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of downhole operations in oil fields, and specifically relates to a casing centralizing milling barrel. Background Art
[0002] After more than 30 years of development in Gudong Oilfield, due to the influence of engineering and geological factors, a large number of oil well and water injection well casings have been damaged to varying degrees, seriously affecting the normal production of crude oil. The successful popularization and application of the technology of replacing and retrieving the casing can not only save the well repair cost for the oil production plant and reduce the well occupation period for operations, but also solve the production difficulties of damaged casing wells that cannot operate normally. Therefore, new casings are used to extend the service life and increase the oil well output. When replacing the casing, it is necessary to mill the cement sheath around the upper casing of the damaged casing, and then pour out the casing one by one. At present, the milling barrel has no centralizing mechanism, and the friction between the inner wall of the milling barrel and the outer wall of the casing is large, resulting in insufficient operation power and slow milling speed, which affects the operation progress and oil well production.
[0003] In summary, the prior art cannot well solve the above-mentioned existing technical problems. Content of the Utility Model
[0004] In view of the deficiencies of the prior art, the utility model provides a casing centralizing milling barrel. It solves the problems that the current milling barrel has no centralizing mechanism, the friction between the inner wall of the milling barrel and the outer wall of the casing is large, resulting in insufficient operation power and slow milling speed, and improves the operation progress of replacing the casing in oil wells.
[0005] The technical solution of the utility model is as follows:
[0006] A casing centralizing milling barrel of the utility model includes: an upper joint, a barrel body, a shaft, rollers, a milling head, and milling teeth. The barrel body is connected to the milling head by threads. An internal thread upper joint is provided at the upper part of the barrel body. Rollers are provided at the upper part of the milling head. A tooth bed is provided at the lower part of the milling head, and milling teeth are evenly distributed on the tooth bed.
[0007] Furthermore, the upper joint and the barrel body are of an integral structure, and an external thread for cooperating with the milling head is provided at the lower part of the barrel body.
[0008] Furthermore, the roller is a combination of an upper cylinder and a lower conical frustum. Bearings are provided at the upper and lower centers of the roller, and a shaft is provided at the center of the bearings.
[0009] Furthermore, an internal thread for cooperating with the barrel body is provided at the upper part of the milling head. Three windows are evenly distributed at the lower part of the internal thread. Axial holes are vertically provided at the centers of the windows. Rollers connected to the shaft through the axial holes are provided in the windows. A spiral tooth bed is provided at the lower part of the milling head, and milling teeth made of tungsten carbide steel material are evenly inlaid and welded at the lower part of the tooth bed.
[0010] Further, the inner and outer diameters of the milling teeth extending out of the trepanning bit are both 5 - 10 mm, and the inner and outer milling teeth are arranged alternately.
[0011] The utility model has the following beneficial effects compared with the prior art:
[0012] 1. By arranging rollers at the upper part of the trepanning bit, when trepanning, the rollers of the trepanning cylinder rollingly contact the outer wall of the casing, reducing the friction between the inner wall of the trepanning cylinder and the casing, and playing a role in straightening to prevent the casing from being worn.
[0013] 2. The milling teeth of the utility model are made of tungsten carbide steel material, with high strength, strong rock-breaking ability, and long service life of the trepanning cylinder.
[0014] 3. During downhole operations, the utility model can trepan the solid cement outside the oil well casing so as to smoothly replace the damaged casing. The trepanning speed is fast, improving the operation progress of replacing the casing of the oil well. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 - Partial sectional structure schematic diagram of the utility model
[0016] Figure 2 - Bottom view structure schematic diagram of the utility model
[0017] In the figure: 1. Upper sub; 2. Cylinder body; 3. Shaft; 4. Roller; 5. Trepanning bit, 5-1. Window, 5-2. Tooth bed; 6. Milling tooth. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] To further understand the content, features and effects of the utility model, the following embodiments are provided and described in detail in conjunction with the accompanying drawings:
[0019] As Figure 1-2 shown, a casing straightening trepanning cylinder of the utility model includes: upper sub 1, cylinder body 2, shaft 3, roller 4, trepanning bit 5, milling tooth 6; characterized in that: the cylinder body 2 is threadedly connected with the trepanning bit 5, an internal-threaded upper sub 1 is provided at the upper part of the cylinder body 2, a roller 4 is provided at the upper part of the trepanning bit 5, a tooth bed 5-2 is provided at the lower part of the trepanning bit 5, and milling teeth 6 are evenly distributed on the tooth bed 5-2.
[0020] Specifically, the upper sub 1 and the cylinder body 2 are of an integral structure, and an external thread matching with the trepanning bit 5 is provided at the lower part of the cylinder body 2.
[0021] Specifically, the roller 4 is a combination of an upper cylinder and a lower conical frustum. Bearings are provided at the upper and lower centers of the roller 4, and a shaft 3 is provided at the center of the bearings.
[0022] It should be noted that by providing a frustum at the lower part of the roller 4, when milling outside the casing while lowering it, the collision between the top of the casing and the lower part of the roller 4 can be effectively avoided, facilitating the introduction of the casing into the casing centralizer milling barrel.
[0023] Specifically, the upper part of the milling head 5 is provided with an internal thread that mates with the cylinder body 2. Three windows 5-1 are evenly distributed below the internal thread. Axial holes 0 are vertically provided at the centers of the windows 5-1. Rollers 4 connected by the axial holes 0 are arranged in the windows 5-1. The lower part of the milling head 5 is provided with a spiral tooth bed 5-2, and carbide steel milling teeth 6 are evenly inlaid and welded at the lower part of the tooth bed 5-2.
[0024] It should be noted that the milling teeth 6 are made of carbide steel material, with high strength, strong rock-breaking ability, and long service life.
[0025] Specifically, the milling teeth 6 protrude from the inner and outer diameters of the milling head 5 by 5-10 mm, and the milling teeth 6 are arranged in an alternating pattern both internally and externally.
[0026] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the scope of protection of the present invention. Structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special instructions and limitations.
Claims
1. A casing straightening sleeve milling barrel, comprising: An upper joint (1), a cylinder (2), a shaft (3), a roller (4), a sleeve milling head (5), and milling teeth (6); the characteristics are that the cylinder (2) and the sleeve milling head (5) are connected by threads, an internal thread upper joint (1) is provided on the upper part of the cylinder (2), a roller (4) is provided on the upper part of the sleeve milling head (5), a gum (5-2) is provided on the lower part of the sleeve milling head (5), and milling teeth (6) are evenly distributed on the gum (5-2).
2. The casing straightening sleeve milling barrel according to claim 1, characterized in that: The upper joint (1) and the cylinder (2) are an integral structure, and an external thread cooperating with the sleeve milling head (5) is provided at the lower part of the cylinder (2).
3. The casing straightening sleeve milling barrel according to claim 1, characterized in that: The roller (4) is a combination of an upper cylinder and a lower truncated cone. Bearings are provided at the top and bottom of the center of the roller (4), and a shaft (3) is provided at the center of the bearing.
4. The casing straightening sleeve milling barrel according to claim 1, characterized in that: The upper part of the sleeve milling head (5) is provided with an internal thread that matches the barrel (2), and three windows (5-1) are evenly distributed at the lower part of the internal thread. Axle holes (0) are vertically arranged at the center of the window (5-1), and rollers (4) connected to the shaft (3) through the shaft hole (0) are arranged in the window (5-1). A spiral gum (5-2) is arranged at the lower part of the sleeve milling head (5), and tungsten carbide steel block milling teeth (6) are evenly inlaid and welded at the lower part of the gum (5-2).
5. The casing straightening sleeve milling barrel according to claim 1, characterized in that: The inner and outer diameters of the milling teeth (6) protruding from the sleeve milling head (5) are both 5-10 mm, and the milling teeth (6) are arranged in a staggered manner inside and outside.