CN2720096Y

CN2720096Y - Efficient bushing milling tool for packer

Info

Publication number: CN2720096Y
Application number: CN 200420030728
Authority: CN
Inventors: 蔡长宇; 张德荣; 严玉中; 郭学春; 黄玉梅
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2004-03-09
Filing date: 2004-03-09
Publication date: 2005-08-24
Anticipated expiration: 2014-03-09

Abstract

The utility model discloses a high efficiency bushing milling tool for a packer, which is composed of milling shoes 1, cutting teeth 2, a milling face 3, and a welding channel 4. The head end part of the bushing milling is provided with exposed teeth with different heights and different shapes, which can assure that the teeth at the end part have good cutting performance and the damage degree of the teeth at the end part caused by impact can be reduced; the hard alloy powder welding channel of the distributing crude particle can reinforce the ability of the radial shock resistance for the milling shoes of the bushing milling and can reduce the influence of the cutting teeth caused by the radial impact. Because the utility model adopts the cutting teeth with different shapes and heights and with staggering distributed teeth on the internal-external circumference of the end face of the hollow milling shoes, the milling face is arranged on the end face to realize the once completion for the cutting and the milling; the bushing milling speed can be enhanced greatly and the construction cycle can be shortened; the problem that the falling object with big diameter in the underground place can realize the bushing milling and the releasing can be solved, so that the high efficiency bushing milling tool for a packer can save the producing cost; the utility model is simple in structure, and reasonable in design; the utility model is quite suitable for the popularization and the application on site.

Description

Efficient packer packaged milling tool

Technical field

The utility model relates to the down-hole workover treatment instrument that uses on a kind of oilfield, particularly a kind of efficient packer packaged milling tool.

Technical background

In oil field well workover fishing process, for some down-hole stuck pipe post or packer, by carry on energetically can't unfreezing all need to overlap and mill operation, the stuck point cover mill off of tubing string or packer is realized unfreezing, packaged milling tool before generally is to adopt casing section mill to cut tooth to add weldering wolfram steel powder and finish, and relies on the hardness of wolfram steel powder to come milling to realize unfreezing, thus cover to mill speed very slow, work period is long, and influences oil well production.

Technical scheme

The purpose of this utility model is to provide a kind of efficient packer packaged milling tool.It is by reasonable portion tooth, and preferred cutting element realizes that the cutting and the milling dual-use function of packaged milling tool realizes connecing card, has improved the cover speed of milling greatly and has reduced the workover treatment cost.

The purpose of this utility model is to realize like this, it is made up of junk mill (1), cutting teeth (2), milling face (3), welding bead (4), on the end face internal and external circumference of hollow junk mill (1) post, be furnished with the difformity of staggered cloth tooth, the cutting teeth (2) of height, be furnished with milling face (3) on the end face, on internal and external circumference, be evenly equipped with welding bead (4), in the negative rake that is provided with the 3-5 degree of the cutting teeth (2) of junk mill (1).

Difformity that cover milling head end is arranged and differing heights are grinningly, to guarantee the existing good cutting ability of end tooth, can reduce the degree that the end tooth is hit simultaneously and damages again, the coarse granule cemented carbide powder welding bead that distributes, to strengthen the radially shock resistance of cover milling-grinding shoe, reduce the influence that cutting teeth is subjected to radial impact.

The utility model is owing to adopted on the end face internal and external circumference of hollow junk mill, be furnished with the difformity of staggered cloth tooth, the cutting teeth of height, the milling face that is furnished with on the end face realized cutting mill, milling once finishes, improve cover greatly and milled speed, shortened construction period, solved down-hole major diameter junk and realized that cover mills the problem of unfreezing, has saved cost of production, it is simple in structure, reasonable in design, is well suited for field popularization application.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a generalized section of the present utility model.

Below in conjunction with accompanying drawing the utility model is further specified.

Embodiment

As shown in Figure 1 and Figure 2, the utility model is made up of junk mill 1, cutting teeth 2, milling face 3, welding bead 4, on the end face internal and external circumference of hollow junk mill 1 post, be furnished with the difformity of staggered cloth tooth, the cutting teeth 2 of height, be furnished with milling face 3 on the end face, be evenly equipped with welding bead 4 on internal and external circumference, cutting teeth 2 is difform polycrystalline cubic boron nitride tooth, and milling face 3 is the coarse granule cemented carbide powder.6 the coarse granule cemented carbide powder welding beads 4 that respectively distributed on the internal and external circumference, junk mill 1 adopts alloy steel to make.

Claims

1, a kind of efficient packer packaged milling tool, it is made up of junk mill (1), cutting teeth (2), milling face (3), welding bead (4), it is characterized in that: on the end face internal and external circumference of hollow junk mill (1) post, be furnished with the difformity of staggered cloth tooth, the cutting teeth (2) of height, be furnished with milling face (3) on the end face, on internal and external circumference, be evenly equipped with welding bead (4), the negative rake of 3-5 degree is all arranged in the setting of the cutting teeth (2) of junk mill (1).

2, efficient packer packaged milling tool according to claim 1, it is characterized in that: cutting teeth (1) is difform polycrystalline cubic boron nitride tooth, and milling face (3) is the coarse granule cemented carbide powder.6 the coarse granule cemented carbide powder welding beads (4) that respectively distributed on the internal and external circumference, junk mill (1) adopt alloy steel to make.