Pilot hole milling shoe tool

Abstract

The utility model relates to a pilot hole milling shoe tool, and belongs to the technical field of oil exploitation. The milling shoe comprises a milling shoe main body, a plurality of milling wings and a milling wing extension section, a well washing fluid channel penetrating in the axial direction of the milling shoe main body is arranged in the milling shoe main body, and the milling wings extend in the axial direction of the milling shoe main body and are arranged at intervals in the circumferential direction of the milling shoe main body. A backflow channel allowing cooling liquid discharged by the well flushing liquid channel to flow is formed in the space between every two adjacent grinding wings, the number of the grinding wing extending sections is smaller than that of the grinding wings, and the grinding wing extending sections are connected to the sides of the corresponding grinding wings and extend into the backflow channels on the sides of the corresponding grinding wings. And densely-arranged alloy milling particles are arranged on the grinding wings and the parts, used for milling the expansion pipe, of the grinding wing extension sections. By additionally arranging the grinding wing extension sections, the effective grinding and milling contact area with a pipeline to be ground and milled is increased, the grinding and milling efficiency is improved, alloy grinding and milling particles are used for grinding and milling, the chipping capacity is improved, and the grinding and milling capacity is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a pilot shoe grinding tool. Background Art

[0002] Oil casing is a large-diameter pipe that serves to fix the wall or borehole of oil and gas wells. When in use, the casing is inserted into the wellbore and fixed with cement to help the wellbore separate the rock formations and prevent the wellbore from collapsing, while ensuring the circulation of drilling mud for drilling and production. If the oil casing is damaged after long-term use, it is necessary to install an expansion tube in the casing for repair. If the expansion tube is installed incorrectly, it is necessary to use a grinding shoe to grind off the expansion tube. If there is a fallen object in the casing, a grinding shoe can also be used for milling.

[0003] In the prior art, a grinding shoe usually includes a grinding shoe body and grinding wings that are arranged on the outer wall of the grinding shoe body at circumferential intervals around the grinding shoe body. A well washing liquid channel is arranged in the grinding shoe body. The well washing liquid channel is used to transport the well washing liquid to the top of the grinding shoe and discharge it to cool the grinding shoe. The interval area between each grinding wing forms a channel for the backflow of the well washing liquid. A pilot eye grinding shoe disclosed in the patent with the authorization announcement number CN220551090U adopts this structure. However, this type of grinding shoe structure has a small contact area between the grinding wings and the inner wall of the pipe, and the grinding efficiency is low. In the prior art, in some grinding shoe tools, a cylindrical alloy body structure is arranged on the outside of the grinding wing to rub the expansion tube. The cylindrical alloy body structure has a large volume and a large cross-sectional area. The volume of the debris generated by grinding is also large, and it is easy to cause blockage. Utility Model Content

[0004] The utility model provides a lead eye grinding shoe tool to solve the technical problems in the prior art that the grinding shoe has low grinding efficiency and the debris generated by grinding is easy to block the grinding channel.

[0005] In order to solve the above problems, the utility model provides a shoe eye grinding tool adopting the following technical solutions:

[0006] A shoe-grinding tool comprising:

[0007] A mill shoe body, wherein a well washing fluid channel is provided in the mill shoe body and penetrates along the axial direction of the mill shoe body;

[0008] A plurality of grinding wings are arranged at intervals along the axial direction of the grinding shoe body and around the circumference of the grinding shoe body, and a space between two adjacent grinding wings forms a reflux channel for the well washing fluid discharged from the well washing fluid channel to flow;

[0009] The grinding wing extension sections, the number of which is less than the number of the grinding wings, are connected to the sides of the corresponding grinding wings and extend into the counterflow channels on the sides of the corresponding grinding wings;

[0010] The parts of the grinding wing and the grinding wing extension section used for grinding the expansion tube are provided with densely arranged alloy grinding particles.

[0011] The beneficial effects of the above technical solution are: the grinding wing extension section is arranged beside the grinding wing, which increases the contact area between the grinding wing and the inner wall of the pipeline, and the grinding effect is better. In addition, the number of grinding wing extension sections is less than the number of grinding wings, so that at least one reflux channel can flow out for the circulation of well washing fluid. In addition, alloy grinding particles are arranged to form a large number of convex structures on the outer surface of the grinding wing and the grinding wing extension section, so that the grinding efficiency is higher, and the debris generated by grinding is smaller in volume and easier to discharge, which can avoid the problem of blockage and drill jamming.

[0012] At the same time, the pilot mill tool provides a well-washing fluid channel to introduce well-washing fluid into the end of the mill body. The well-washing fluid carries the debris and discharges the debris through impact force, which can keep the working surface clean, avoid debris stuck between the mill and the pipe wall, and cause repeated cutting of the drill bit, which can reduce the wear of the mill and improve the cutting efficiency. The discharged well-washing fluid can also cool and lubricate the mill and the drill string, reduce the temperature of the drill bit, reduce the wear of the drill tool, and increase the service life of the drill tool.

[0013] Furthermore, an even number of grinding wings are provided on the outer side of the grinding shoe body, the number of grinding wing extension sections is half the number of grinding wings, and the side of one of any two adjacent grinding wings is connected with a grinding wing extension section.

[0014] The beneficial effects of the above technical solution are: the grinding wing extension sections are distributed more evenly and the grinding effect is better.

[0015] Furthermore, each grinding wing extension section is located on the same side of each grinding wing.

[0016] The beneficial effect of the above technical solution is that the grinding wing extension sections are distributed more evenly, and each grinding wing extension section can have a completely unobstructed and unblocked reflux channel on both sides, so that the grinding chips generated by grinding each grinding wing extension section can be taken away by the reflux channel on the side, the chip removal effect is better, and blockage caused by accumulation of grinding chips can be avoided.

[0017] Furthermore, the width dimension of the grinding wing extension section in the circumferential direction of the grinding shoe body is smaller than the width dimension of the reflux channel, and the length dimension of the grinding wing extension section in the axial direction of the grinding shoe body is smaller than the length dimension of the reflux channel.

[0018] The beneficial effect of the above technical solution is that the width of the grinding wing extension section is smaller than the width of the reflux channel, and the grinding wing extension section does not completely block the reflux channel. In this way, the reflux channel with the grinding wing extension section can also allow well washing fluid to pass through, and the chip removal effect is better.

[0019] Furthermore, a guide shoe body is provided at one end of the grinding shoe body, and a connecting section for connecting with a drill rod is provided at the other end.

[0020] The beneficial effect of the above technical solution is that the guiding shoe body is used to ensure that the grinding shoe body enters the expansion tube smoothly, and avoids foreign objects stuck in the expansion tube from causing impact damage to the grinding wing body.

[0021] Furthermore, the end of the guide shoe body facing away from the grinding shoe body is V-shaped.

[0022] The beneficial effect of the above technical solution is that one end of the guiding shoe body is V-shaped, which is convenient for guiding the shoe body to move downward.

[0023] Furthermore, a side of the grinding wing close to the guide shoe body has a section of a guiding inclined surface, and a side of the grinding wing extension section close to the guide shoe body has a section of an extended guiding inclined surface.

[0024] The beneficial effect of the above technical solution is that the guiding slope and the extended guiding slope are provided to facilitate the downward movement of the grinding wing and the grinding wing extension section.

[0025] Furthermore, a straightening guide rod is connected to one side of the grinding wing close to the guide shoe body, the thickness of the straightening guide rod in the radial direction of the grinding shoe body is smaller than the thickness of the grinding wing, and the guiding slope is connected between the straightening guide rod and the grinding wing.

[0026] The beneficial effect of the above technical solution is that the straightening guide rod straightens the expansion pipe to be milled before the grinding wing contacts the expansion pipe to be milled, thereby preventing the grinding wing from directly milling the bent or tilted expansion pipe and causing damage to the grinding wing.

[0027] Furthermore, the guide shoe body is provided with a through hole which penetrates radially through the grinding shoe body, and the well washing fluid channel extends to the through hole and is communicated with the through hole.

[0028] The beneficial effect of the above technical solution is that the guide shoe body is provided with a perforation, and the well-washing liquid channel is connected to the perforation, which can avoid the guide shoe body from blocking the well-washing liquid channel and enable the well-washing liquid to be discharged smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0030] Figure 1 A schematic diagram of the structure of a shoe-grinding tool provided by the utility model Figure 1 ;

[0031] Figure 2 A schematic diagram of the structure of a shoe-grinding tool provided by the utility model Figure 2 ;

[0032] Figure 3 A top view of a shoe-eye grinding tool provided by the utility model;

[0033] Figure 4 A front view of a shoe-eye grinding tool provided by the utility model;

[0034] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0035] Description of reference numerals:

[0036] 1. Straightening guide rod; 2. Guide shoe body; 201. Top slope; 3. Perforation; 4. Grinding shoe body; 5. Grinding wing; 6. Grinding wing extension section; 7. Backflow channel; 8. Guide slope; 9. Extended guide slope; 10. Connecting section; 11. Well washing fluid channel. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0038] The following is one embodiment of a shoe eye grinding tool provided by the utility model:

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a pilot shoe tool comprises a cylindrical shoe body 4, a cylindrical well-washing fluid channel 11 extending along the axis direction of the shoe body 4 is provided at the middle position of the shoe body 4, and the well-washing fluid channel 11 runs through the shoe body 4. Six grinding wings 5 ​​are evenly arranged along the circumference of the shoe body 4 on the outer side wall of the shoe body 4, the grinding wings 5 ​​are in the shape of long strips and extend along the axis direction of the shoe body 4, and the area between each two adjacent grinding wings 5 ​​forms a reflux channel 7 for the well-washing fluid to flow.

[0040] A guide shoe body 2 is provided on one side of the mill shoe body 4, and a connecting section 10 is provided on the other side. The guide shoe body 2 is in the shape of a plate, and the top of the guide shoe body 2 has two top inclined surfaces 201 set at an angle, and the two top inclined surfaces 201 form a V-shaped structure at the top of the guide shoe body 2. A densely distributed protruding alloy body particle structure is provided on the outer wall of the V-shaped structure in the guide shoe body 2 to improve the structural strength of the guide shoe body 2, so that the foreign matter stuck in the pipeline can be crushed or pushed away during the downward movement of the guide shoe body 2. The alloy body particle structure is not shown in the figure. The guide shoe body 2 is provided with a through hole 3 that penetrates radially along the mill shoe body 4, and the well washing fluid channel 11 is connected to the through hole 3. The connecting section 10 is used to connect with the drill pipe so that the entire mill shoe tool rotates under the drive of the drill pipe to grind the expansion pipe.

[0041] Among the six grinding wings 5, three of the grinding wings 5 ​​uniformly arranged around the circumference of the grinding shoe body 4 are connected to the same side with a grinding wing extension section 6, and the grinding wing extension section 6 is integrally formed with the corresponding grinding wing 5. The outer side walls of the grinding wing 5 and the grinding wing extension section 6 are densely covered with a large number of protruding alloy abrasive particles with different shapes and sizes, and the alloy abrasive particles are not shown in the figure. The grinding wing extension section 6 extends to the backflow channel 7 beside the grinding wing 5. In the circumferential direction of the grinding shoe body, the width dimension of the grinding wing extension section 6 is smaller than the width dimension of the backflow channel 7, and in the axial direction of the grinding shoe body, the length dimension of the grinding wing extension section 6 is smaller than the length dimension of the backflow channel 7. One end of the grinding wing extension section 6 close to the guide shoe body 2 is flush with one end of the grinding wing 5 close to the guide shoe body 2, and one end of the grinding wing 5 close to the guide shoe body 2 has a guide slope 8, and one end of the grinding wing extension section 6 close to the guide shoe body 2 has an extended guide slope 9.

[0042] Six straightening guide rods 1 are evenly arranged in the circumferential direction of the grinding shoe body 4 on the outer side wall of the grinding shoe body 4. The straightening guide rods 1 extend along the axial direction of the grinding shoe body 4, and are connected to the grinding wing 5 on the side close to the guide shoe body 2. The thickness of the straightening guide rods 1 in the radial direction of the grinding shoe body is smaller than the thickness of the grinding wing 5. The guide slope 8 is connected between the straightening guide rods 1 and the grinding wing 5 to form a slope transition between the straightening guide rods 1 and the grinding wing 5. The extension guide slope 9 is connected between the outer side wall of the grinding shoe body 4 and the grinding wing extension section 6 to form a slope transition between the grinding shoe body 4 and the grinding wing extension section 6.

[0043] The two sides of the guide shoe body 2 in the radial direction of the grinding shoe body 4 correspond to two oppositely arranged grinding wings 5 ​​on the outer side of the grinding shoe body 4, and the two sides of the guide shoe body 2 are connected to the straightening guide rods 1 on the two grinding wings 5 ​​as a whole.

[0044] When the utility model is used, the whole grinding shoe tool is connected to the drill rod through the connecting section 10, and the drill rod drives the grinding shoe tool to be inserted into the expansion tube and drives the grinding shoe tool to rotate. During the movement of the grinding shoe tool, the guide shoe body 2 is located at the front, and the blockage in the expansion tube can be pushed away, so as to ensure that the grinding shoe tool can move smoothly in the expansion tube. During the movement, the straightening guide rod 1 straightens the expansion tube first, and the grinding wing 5 and the grinding wing extension section 6 move to the straightened expansion tube, and grind the expansion tube. The alloy abrasive particles directly contact the inner wall of the expansion tube and grind the expansion tube to grind off the expansion tube. At the same time, the well washing fluid is injected from the well washing fluid channel 11 and flows out from the perforation 3. The outflowing well washing fluid enters the reflux channel 7. Under the impact of the well washing fluid, the debris generated by the grinding and milling is carried out from the reflux channel 7, which has the effect of chip removal, and avoids the debris generated by the grinding and milling from accumulating between the grinding wing 5, the grinding wing extension section 6 and the casing. As the grinding and milling tool repeatedly rotates, it causes a drill jam accident and cannot continue construction.

[0045] The utility model increases the effective milling contact area with the pipeline to be milled by adding a milling wing extension section, thereby improving the milling efficiency. The utility model uses densely distributed alloy milling particles of different sizes for milling, which greatly improves the chip crushing capacity. The chip crushing generated by milling is smaller in volume and easy to discharge. The milling capacity is strong and the operating effect is good.

[0046] In this embodiment, the number of the grinding wing extension sections is half of the number of the grinding wings. In other embodiments, the number of the grinding wing extension sections may be more than half of the number of the grinding wings or less than half of the number of the grinding wings.

[0047] In this embodiment, each grinding wing extension section is located on the same side of each grinding wing. In other embodiments, the grinding wing extension sections may also be arranged on different sides of the grinding wing.

[0048] In this embodiment, grinding wing extension sections are provided on the sides of three of the six grinding wings that are evenly arranged around the circumference of the grinding shoe body. In other embodiments, grinding wing extension sections can be provided on the sides of three of the six grinding wings that are unevenly arranged around the circumference of the grinding shoe body.

[0049] In this embodiment, in the circumferential direction of the grinding shoe body, the width dimension of the grinding wing extension section is smaller than the width dimension of the reverse flow channel. In other embodiments, the width dimension of the grinding wing extension section is equal to the width dimension of the reverse flow channel.

Claims

1. A shoe-grinding tool. It is characterized in that include: A mill shoe body, wherein a well washing fluid channel is provided in the mill shoe body and penetrates along the axial direction of the mill shoe body; A plurality of grinding wings are arranged at intervals along the axial direction of the grinding shoe body and around the circumference of the grinding shoe body, and a space between two adjacent grinding wings forms a reflux channel for the well washing fluid discharged from the well washing fluid channel to flow; The grinding wing extension sections, the number of which is less than the number of the grinding wings, are connected to the sides of the corresponding grinding wings and extend into the counterflow channels on the sides of the corresponding grinding wings; The parts of the grinding wing and the grinding wing extension section used for grinding the expansion tube are provided with densely arranged alloy grinding particles.

2. A shoe eye grinding tool according to claim 1, It is characterized in that An even number of grinding wings are arranged on the outer side of the grinding shoe body, the number of grinding wing extension sections is half of the number of grinding wings, and the side of one of any two adjacent grinding wings is connected with a grinding wing extension section.

3. A shoe-eye grinding tool according to claim 2, It is characterized in that The grinding wing extension sections are respectively located on the same side of the grinding wings.

4. A shoe-eye grinding tool according to claim 3, It is characterized in that The width dimension of the grinding wing extension section in the circumferential direction of the grinding shoe body is smaller than the width dimension of the counterflow channel, and the length dimension of the grinding wing extension section in the axial direction of the grinding shoe body is smaller than the length dimension of the counterflow channel.

5. A shoe eye grinding tool according to any one of claims 1 to 4, It is characterized in that A guide shoe body is provided at one end of the grinding shoe body, and a connecting section for connecting with a drill rod is provided at the other end.

6. A shoe eye grinding tool according to claim 5, It is characterized in that The end of the guide shoe body facing away from the grinding shoe body is V-shaped.

7. A shoe-eye grinding tool according to claim 6, It is characterized in that The side of the grinding wing close to the guide shoe body has a section of guiding inclined surface, and the side of the grinding wing extension section close to the guide shoe body has a section of extending guiding inclined surface.

8. A shoe-eye grinding tool according to claim 7, It is characterized in that A straightening guide rod is connected to one side of the grinding wing close to the guide shoe body. The radial thickness of the straightening guide rod is smaller than the thickness of the grinding wing. The guiding slope is connected between the straightening guide rod and the grinding wing.

9. A shoe-eye grinding tool according to claim 8, It is characterized in that The guide shoe body is provided with a through hole which penetrates radially of the grinding shoe body, and the well washing fluid channel extends to the through hole and is communicated with the through hole.

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