CN212054576U

CN212054576U - Grind shoe

Info

Publication number: CN212054576U
Application number: CN202020631145.2U
Authority: CN
Inventors: 祝君; 刘伟
Original assignee: Tonghua Yuantong Petroleum Machinery Co ltd
Current assignee: Tonghua Yuantong Petroleum Machinery Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-12-01
Anticipated expiration: 2030-04-24

Abstract

The invention relates to a grinding shoe for workover treatment in an oil field. The multifunctional grinding shoe comprises a grinding shoe body, wherein the front end of the grinding shoe body is a grinding head part, YD alloy is welded on the front end face of the grinding head, prismatic hard alloy blocks with a plurality of convex end faces are distributed and welded on the front end face of the YD alloy, and a plurality of button alloys are welded on the outer circumference of the grinding head section. The milling shoe body and the milling head are cylindrical, the milling shoe body is of an eccentric structure, namely, the center line of the joint thread of the milling shoe body and the center line of the milling head have an eccentric distance, and the rear part YD alloy is also welded on the junction of the two eccentric cylinders in a surfacing mode. YD alloy which is additionally welded at the junction of the eccentric structure and the shaft neck enables the milling shoe not to be stuck with a drill. The prism-type hard alloy blocks and the YD alloy combined grinding head which are arranged in a special spiral line mode have high hardness, a plurality of cutting edges and sharpness, and are quick to grind shoes and high in efficiency. The spiral ridge belt and the inlaid button alloy have good functions of gauge protection and sheath.

Description

Grind shoe

Technical Field

The invention relates to a grinding shoe for workover treatment in an oil field.

Background

In the prior art, a milling shoe for milling down-hole falling objects consists of a milling shoe body and YD alloy which is overlaid on the front end of the milling shoe body, wherein a circulating water hole is arranged in the middle of the milling shoe body, and a water tank is arranged outside the milling shoe body. The disadvantages of the method are that the YD alloy is slowly milled into a ruler and the efficiency is low; the sleeve is easy to mill and damage; in addition, sticking can occur in complex well conditions.

Disclosure of Invention

The invention aims to provide a milling shoe with improved structure, safety, reliability and higher working efficiency aiming at the defects.

The technical solution of the invention is as follows: the milling shoe comprises a milling shoe body, wherein the front end of the milling shoe body is a milling head part, YD alloy is welded on the front end face of the milling head, the milling shoe is characterized in that prismatic hard alloy blocks with a plurality of convex end faces are welded on the front end face of the YD alloy in a distributed mode, and a plurality of button alloys are welded on the outer circumference of the milling head section.

In the above-mentioned scheme, the first step of the method,

the milling shoe body and the milling head are cylindrical, the milling shoe body is of an eccentric structure, namely, the center line of the joint thread of the milling shoe body and the center line of the milling head have an eccentric distance, and the rear part YD alloy is also welded on the junction of the two eccentric cylinders in a surfacing mode.

The prismatic cemented carbide pieces are arranged in an archimedes-like spiral on the front end face of the YD alloy.

Four spiral water tanks and four ridge belts are arranged on the outer circumference of the grinding head section, and button alloy is uniformly distributed and embedded on the four ridge belts in a brazing mode.

The milling shoe body is of an eccentric structure, namely, the eccentric distance between the central line of the joint thread and the central line of the grinding head is e, YD alloy is further surfacing welded at the junction of two eccentric journals, the eccentric structure enables the milling shoe to mill falling objects larger than the diameter of the body, and the YD alloy surfacing welded at the junction of the journals further has a certain milling effect when the tool is lifted, so that the defect of the phenomenon that the milling shoe is stuck in the milling process is overcome. Eight holes are drilled at the bottom of the grinding shoe, namely the grinding head part, according to a special spiral line mode, eight prismatic hard alloy blocks with rear angles are embedded, the eight hard alloy blocks radially cover the whole circumference, YD alloy is used for overlaying and paving other spaces to form a composite grinding head for grinding fallen shoes, and the working efficiency is greatly improved. Four water holes are arranged on the end face of the grinding shoe, and four circulating water tanks are correspondingly arranged on the excircle, so that cooling liquid can be effectively provided for the grinding shoe, and drill cuttings can be brought to the ground through well washing circulating liquid. Three button alloys are equidistantly inlaid on each ridge corresponding to the four circulating water tanks, so that the effect of ensuring the aperture and protecting the diameter is achieved, the purpose of protecting the casing pipe from being damaged is achieved, and a certain anti-blocking effect is achieved.

The invention has the advantages that: 1. YD alloy which is additionally welded at the junction of the eccentric structure and the shaft neck enables the milling shoe not to be stuck with a drill. 2. The prism-type hard alloy block and the YD alloy combined grinding head which are arranged in a special spiral line mode have the advantages of high hardness, multiple cutting edges, sharpness, high grinding and milling speed and high efficiency. 3. The radial size of the button alloy inlaid in the spiral ridge belt is slightly higher than that of the mill shoe body, and the button alloy has good diameter protection and sheath effects.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a structural view of a grind shoe of the present invention.

Fig. 2 is a schematic diagram of the right side view of fig. 1.

Detailed Description

Referring to fig. 1 and 2, the names of the components are as follows: the grinding shoe comprises a grinding shoe body 1, prismatic hard alloy blocks 2, YD alloy 3, button alloy 4, YD alloy 5 at the rear part, a grinding head 6, a spiral water tank 7, a ridge belt 8 and water holes 9.

Referring to fig. 1 and 2, the milling shoe comprises a milling shoe body 1, wherein the front end of the milling shoe body 1 is a milling head 6, and the front end face of the milling head 6 is welded with YD alloy 3. Prismatic hard alloy blocks 2 with a plurality of convex end surfaces are distributed and welded on the front end surface of the YD alloy 3, and a plurality of button alloys 4 are welded on four edge belts 8 on the outer circumference of the grinding head section.

The grinding head at the lower part of the grinding shoe body 1 is in a cylindrical shape, the grinding shoe body 1 is in an eccentric structure, namely, the center line of the joint thread of the grinding shoe body 1 and the center line of the grinding head have an eccentric distance, and the rear part YD alloy 5 is also welded at the junction of the two eccentric cylinders in a surfacing mode.

The prismatic cemented carbide pieces 2 are arranged in an archimedes-like spiral on the front end face of the YD alloy 3.

Four spiral water tanks 7 and four edge belts 8 are arranged on the outer circumference of the grinding head section, and button alloys 4 are uniformly distributed and embedded on the four edge belts 8 in a brazing mode.

The upper part of the milling shoe body 1 is provided with a screw thread connected with a drilling tool, the middle part of the milling shoe body is provided with a water hole, and the whole milling shoe body is of an eccentric structure, namely, the center line of the upper part joint screw thread of the milling shoe body 1 and the center line of the lower part milling part of the milling shoe body 1 have an eccentric distance of e. Eight holes are drilled on the end face of the bottom of the grinding shoe body 1 according to a special spiral line track similar to an Archimedes spiral line, prismatic hard alloy blocks 2 with rear angles are embedded and welded, YD alloy 3 with the thickness of 5-8mm is surfacing welded on other places of the bottom, and the prismatic hard alloy blocks 2 and the cylindrical hard alloy blocks form a grinding and milling part. Four water holes 9 are arranged on the end face of the grinding shoe, and four circulating spiral water channels 7 are correspondingly arranged on the excircle, so that cooling liquid can be effectively provided for the grinding shoe, and drill cuttings can be brought to the ground through well washing circulating liquid. Four spiral water tanks 7 are processed on the excircle of the lower part of the mill shoe body 1 to be used as circulation channels of well-flushing liquid, and a plurality of button alloys 4 are uniformly distributed and embedded on four ridge belts 8 in a brazing mode and used for diameter protection and sheath protection. The rear YD alloy 5 with the particle size of 3-5mm is surfacing welded at the junction of the two eccentric cylinders, so that smooth transition of the junction is ensured, and a certain anti-blocking effect can be achieved.

The foregoing description is only exemplary of the invention and is not intended to limit the spirit of the invention.

Claims

1. The milling shoe comprises a milling shoe body (1), wherein the front end of the milling shoe body (1) is a milling head (6), YD alloy (3) is welded on the front end face of the milling head (6), the milling shoe is characterized in that prismatic hard alloy blocks (2) with a plurality of convex end faces are welded on the front end face of the YD alloy (3) in a distributed mode, and a plurality of button alloys (4) are welded on the outer circumference of a milling head section.

2. The milling shoe according to claim 1, characterized in that the milling shoe body (1) and the milling head (6) are cylindrical, the milling shoe body (1) is eccentric, that is, the center line of the joint thread of the milling shoe body (1) has an eccentric distance with the center line of the milling head, and the rear part YD alloy (5) is welded on the junction of the two eccentric cylinders.

3. Mill shoe according to claim 1 or 2, characterised in that the prismatic cemented carbide pieces (2) are arranged in an archimedes-like spiral on the front face of the YD-alloy (3).

4. The milling shoe as claimed in claim 3, characterized in that the outer circumference of the grinding head section is provided with four spiral water grooves (7) and four edge belts (8), and the four edge belts (8) are uniformly embedded with the button alloy (4) by brazing.