阅读说明：本技术 一种提高磨鞋切削效率的方法及所用断口定心磨铣鞋 (Method for improving cutting efficiency of grinding shoe and fracture centering grinding and milling shoe used in method ) 是由 张泽丽 沈赤卫 张腾飞 黄保黔 郑廷碧 张盼 杨通华 万文财 金锋 梁柔 王文 于 2019-12-18 设计创作，主要内容包括：本发明公开了一种提高磨鞋切削效率的方法及所用断口定心磨铣鞋,本发明是在本体的磨铣段前端增设钻头段；利用钻头段前端和中部两条刀翼上所焊接的碳化钨多棱柱硬质合金块先消除管柱内孔壁上的水泥饼和油垢后,再用钻头段后端的磨铣段进行磨铣；从而提高磨鞋切削效率。其结构包括本体(1),本体(1)由左至右分为连接段(2)、磨铣段(3)、射流段(4)和钻头段(5)；钻头段(5)两侧边缘排列有一组多棱硬质合金刀块(9)。本发明可高效处理水眼内硬物和修理不规则水眼,并且能够实现一趟下钻同时完成通水眼和修鱼头的目的,提高效率3～5倍,缩短了作业周期。(The invention discloses a method for improving the cutting efficiency of a milling shoe and a fracture centering milling shoe used by the same, wherein a drill bit section is additionally arranged at the front end of a milling section of a body; removing cement cakes and oil dirt on the inner hole wall of the tubular column by using tungsten carbide polygonal-prism hard alloy blocks welded on two blades at the front end and the middle part of the drill bit section, and then performing milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grind shoe. The structure of the drill bit comprises a body (1), wherein the body (1) is divided into a connecting section (2), a milling section (3), a jet flow section (4) and a drill bit section (5) from left to right; a group of multi-edge hard alloy cutter blocks (9) are arranged on the edges of the two sides of the drill bit section (5). The invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purpose of simultaneously completing water hole communication and fish head repair by one-time drilling, improves the efficiency by 3-5 times and shortens the operation period.)

1. A method for improving the cutting efficiency of a grind shoe is characterized in that: the method is that a drill bit section is added at the front end of a milling section of a body; removing cement cakes and oil dirt on the inner hole wall of the tubular column by using tungsten carbide polygonal-prism hard alloy blocks welded on two blades at the front end and the middle part of the drill bit section, and then performing milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grind shoe.

2. The method for improving the cutting efficiency of a grind shoe according to claim 1, wherein: the tungsten carbide polygonal prism hard alloy block is an insert with a rake angle and a cutting groove.

3. The method for improving the cutting efficiency of a grind shoe according to claim 1, wherein: the tungsten carbide polygonal prism hard alloy block is welded by adopting a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm and matching with a high-strength coated nickel-silver-based brazing material.

4. The method for improving the cutting efficiency of a grind shoe according to claim 1, wherein: the rear end of the drill bit section is provided with a jet flow section; the jet hole on the jet section is located between two blades of the drill bit section, and the drill bit section is cooled by spraying cooling liquid, so that the service life of the drill bit is prolonged.

5. A fracture centering mill for use in any one of the methods of claims 1 to 4, comprising a body (1), characterized in that: the body (1) is divided into a connecting section (2), a milling section (3), a jet flow section (4) and a drill bit section (5) from left to right; the front end of the drill bit section (5) is in a shape of a conical flat plate (12), and a group of multi-edge hard alloy cutter blocks (9) are arranged on the edges of two sides of the conical flat plate (12); the rear section of the drill bit section (5) is of a double-blade structure, and a cooling channel (13) is formed between the two blades.

6. The fracture centering mill shoe of claim 5, wherein: the jet flow section (4) is a cylinder, a blind hole (10) is formed in the center of the jet flow section (4), a pair of jet flow holes (11) uniformly distributed along the circumference are formed in the periphery of the blind hole (10), and one end of each jet flow hole (11) is communicated with the blind hole (10); the outlet at the other end of the jet hole (11) is positioned between two blades of the drill bit section (5).

7. The fracture centering mill shoe of claim 5, wherein: the cross section of the milling section (3) is in the shape of a cross wing, a group of multi-edge hard alloy cutter blocks (9) are arranged on the same side of each cutter wing (8) of the cross wing, and a water hole (6) is formed in the center of the milling section (3); the water hole (6) is communicated with the blind hole (10) of the jet flow section (4).

8. The fracture centering mill shoe of claim 5, wherein: the outer circle of the connecting section (2) is a variable diameter cylinder, wherein the end with the larger diameter is connected with the milling section (3) into a whole; a water hole (6) is arranged at the center of the connecting section (2), and a connecting thread (7) for connecting a drilling tool is arranged at the orifice of the thinner end of the connecting section (2).

9. The fracture centering mill shoe of claim 7, wherein: a group of multi-edge hard alloy cutter blocks (9) on each blade (8) of the milling section (3) are arranged in order in a row-column manner; the tungsten carbide polygonal-prism hard alloy block is provided with a cutting groove and a cutting rake angle.

Technical Field

The invention relates to a method for improving the cutting efficiency of a milling shoe and a fracture centering milling shoe used by the same, belonging to the technical field of workover tools.

Background

At present, in the oil-water well action process of an oil field, when damaged fish tops and falling objects in the well cannot be normally salvaged, the damaged falling objects and the fish tops are usually ground and milled by using grinding shoes so as to be convenient for salvage of the falling objects, and when the objects which are not fallen in the well are treated, a plugging surface and a cement-clamped pipe column which cannot be drilled and removed by using a common drill bit are generally adopted, and different milling tools are generally adopted for realizing. The milling tool generally comprises a flat-bottom milling shoe, a concave-bottom milling shoe, a multi-edge milling shoe and the like, and the milling teeth of the milling shoes are generally composed of YD hard alloy or other wear-resistant materials which are overlaid. The carbide particles do not have regular front angles and cutting grooves, so the use process is low in efficiency, the operation time is long, and the production is influenced.

Disclosure of Invention

The invention aims to provide a method for improving the cutting efficiency of a milling shoe and a fracture centering milling shoe used by the method, so as to improve the cutting efficiency of the milling shoe and overcome the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a method for improving the cutting efficiency of a grinding shoe, which is characterized in that a drill bit section is additionally arranged at the front end of a grinding and milling section of a body; removing cement cakes and oil dirt on the inner hole wall of the tubular column by using tungsten carbide polygonal-prism hard alloy blocks welded on two blades at the front end and the middle part of the drill bit section, and then performing milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grind shoe.

In the method for improving the cutting efficiency of the grind shoe, the tungsten carbide polygonal cemented carbide block is a blade with a rake angle and a cutting groove.

In the method for improving the milling efficiency of the shoe, the tungsten carbide polygonal-prism hard alloy block is welded by adopting a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm and matching with a high-strength nickel-silver-based brazing material with a coating.

In the method for improving the cutting efficiency of the mill shoe, the rear end of the drill bit section is provided with a jet flow section; the jet hole on the jet section is located between two blades of the drill bit section, and the drill bit section is cooled by spraying cooling liquid, so that the service life of the drill bit is prolonged.

The fracture centering milling shoe comprises a body, wherein the body is divided into a connecting section, a milling section, a jet flow section and a drill bit section from left to right; the front end of the drill bit section is in a conical flat plate shape, and a group of multi-edge hard alloy cutter blocks are arranged on the edges of two sides of the conical flat plate; the cross section of the rear section of the drill bit section is of a double-blade structure, and a cooling channel is formed between the two blades.

In the fracture centering milling shoe, the jet flow section is a cylinder, a blind hole is formed in the center of the jet flow section, a pair of jet flow holes uniformly distributed along the circumference are formed in the periphery of the blind hole, and one end of each jet flow hole is communicated with the blind hole; and an outlet at the other end of the jet hole is positioned between the two blades of the drill bit section.

In the fracture centering milling shoe, the cross section of the milling section is in the shape of a cross wing, a group of multi-edge hard alloy cutter blocks are arranged on the same side of each cutter wing of the cross wing, and a water hole is formed in the center of the milling section; the water hole is communicated with the blind hole of the jet flow section.

In the fracture centering milling shoe, the excircle of the connecting section is a reducing cylinder, wherein the end with the larger diameter is connected with the milling section into a whole; the center of the connecting section is provided with a water hole, and the orifice at the end with the thinner diameter of the connecting section is provided with a connecting thread for connecting a drilling tool.

In the fracture centering milling shoe, a group of multi-edge hard alloy cutter blocks on each blade of the milling section are arranged in order in a row-column manner; the tungsten carbide polygonal-prism hard alloy block is provided with a cutting groove and a cutting rake angle.

Due to the adoption of the technical scheme, compared with the prior art, the invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purposes of simultaneously completing water hole communication and fish head repair by one-time drilling, improves the efficiency by 3-5 times and shortens the operation period.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view B-B of FIG. 2;

FIG. 5 is a schematic cross-sectional view C-C of FIG. 2;

fig. 6 is a view from direction D of fig. 1.

The labels in the figures are: 1-body, 2-connecting section, 3-milling section, 4-jet flow section, 5-drill section, 6-water hole, 7-connecting thread, 8-blade, 9-multi-edge hard alloy blade block, 10-blind hole, 11-jet flow hole, 12-conical flat plate and 13-cooling channel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

According to the method for improving the cutting efficiency of the grinding shoe, as shown in figures 1 and 2, a drill bit section 5 is additionally arranged at the front end of a milling section 3 of a body 1; the cemented carbide blocks 9 welded on the two blades at the front end and the middle part of the drill bit section 5 are used for eliminating cement cakes and oil dirt on the inner hole wall of the pipe column, and then the milling section 3 at the rear end of the drill bit section 5 is used for milling; thereby improving the cutting efficiency of the grind shoe. The tungsten carbide polygonal cemented carbide block 9 is an insert with rake angles and cutting grooves. The tungsten carbide polygonal prism hard alloy block 9 adopts a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm and is matched with a high-strength coated nickel-silver-based brazing material for welding. The rear end of the drill bit section 5 is provided with a jet flow section 4; jet hole 11 on jet section 4 is located between two blades of drill bit section 5, cools off drill bit section 5 through spraying the coolant liquid to improve the life of drill bit.

The fracture centering milling shoe which is formed according to the method and is used for the method comprises a body 1, wherein the body 1 is divided into a connecting section 2, a milling section 3, a jet flow section 4 and a drill bit section 5 from left to right as shown in figures 1 to 6; the front end of the drill bit section 5 is in a shape of a conical flat plate 12 as shown in fig. 2 and 5, and a group of multi-edge cemented carbide cutter blocks 9 are arranged on the edges of two sides of the conical flat plate 12; the rear section of the drill bit section 5 is shown in fig. 4 as a double-blade structure, and a cooling channel 13 is formed between the two blades. The jet flow section 4 is a cylinder, a blind hole 10 is arranged in the center of the jet flow section 4, a pair of jet flow holes 11 uniformly distributed along the circumference are arranged around the blind hole 10, and one end of each jet flow hole 11 is communicated with the blind hole 10; the outlet at the other end of the jet hole 11 is positioned between two blades of the drill bit section 5. The cross section of the milling section 3 is in a cross wing shape as shown in fig. 3, a group of multi-edge hard alloy cutter blocks 9 are arranged on the same side of each cutter wing 8 of the cross wing, and a water hole 6 is formed in the center of the milling section 3; the water hole 6 is communicated with the blind hole 10 of the jet flow section 4. The outer circle of the connecting section 2 is a reducing cylinder, wherein the end with the larger diameter is connected with the milling section 3 into a whole; the center of the connecting section 2 is provided with a water hole 6, and the orifice of the thinner end of the connecting section 2 is provided with a connecting thread 7 for connecting a drilling tool. A group of multi-edge hard alloy cutter blocks 9 on each cutter wing 8 of the milling section 3 are arranged in order in a row-column mode; the tungsten carbide polygonal-prism hard alloy block is provided with a cutting groove and a cutting rake angle.

The invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purpose of simultaneously completing water hole communication and fish head repair by one-time drilling, improves the efficiency by 3-5 times and shortens the operation period.