CN207420521U - A kind of efficient milling shoes - Google Patents

Abstract

A kind of efficient milling shoes, the underground work fishing tool being related in petroleum gas engineering；Including junk mill body, wing, hard alloy mill teeth, the wing is at least three, and each road wing is distributed on junk mill body portion, and the front end of each wing is more than the junk mill body front end；Axial bore is set in junk mill body, axial bore rear sidewall sets drill rod thread, multiple tracks water channel is set in the junk mill body in front of axial bore, and the water outlet of each water channel is separately positioned on the junk mill body end face between each wing, and inner cavity of each water channel respectively with junk mill body connects；The lateral wall of the junk mill body is protruded in wing side respectively, and spout is formed between two neighboring wing and junk mill outer body wall；The inserted lateral working face for being respectively welded at wing of hard alloy, the hard alloy mill teeth of the working face of each wing form a complete continuous milling covering surface.This junk mill mill teeth milling depth of tooth penetration is big, milling efficiency is high；Hard alloy mill teeth intensity is big, and service life is long.

Description

A kind of efficient milling shoes

Technical field

The utility model is related to the underground work fishing tool in petroleum gas engineering, for milling bridge plug, oil pipe etc. Trouble of lost tool in hole belongs to underground operation tool class.

Background technology

Junk mill is a kind of downhole tool for milling trouble of lost tool in hole, is mainly used for milling connector, drilling rod, oil pipe, gear wheel The trouble of lost tool in hole such as drill bit.

At present, common flat-bottom grind shoes, the mostly structure in big cylinder ends surface soldered carbide button, have hydrophthalmia to run through Entire milling shoe tool.There are the defects of depth of tooth penetration is inadequate, efficiency is low, chip removal is not smooth for the junk mill of this structure.More also change Into alloy welding manner junk mill, although milling efficiency can be improved, there are the caducous problems of alloy.In addition, alloy It is inconsistent that irrational distribution is also easy to cause junk mill overall wear, shortens junk mill service life.

Utility model content

The utility model provides a kind of efficient milling shoes, it is therefore intended that improves the efficiency of junk mill milling tubing junk, and solves The problem of inserted entirety comes off.

The utility model includes junk mill body, wing, hard alloy mill teeth, and the wing is at least three, each road wing The junk mill body portion is distributed on, the front end of each wing is more than the junk mill body front end；It is set in the junk mill body Put axial bore, the axial bore rear sidewall sets drill rod thread, and multiple tracks is set in the junk mill body in front of axial bore Water channel, the water outlet of each water channel are separately positioned on the junk mill body end face between each wing, each water channel respectively with junk mill body Inner cavity connection；The lateral wall of the junk mill body is protruded in the wing side respectively, and two neighboring wing and junk mill sheet are external Spout is formed between side wall；The inserted lateral working face for being respectively welded at the wing of the hard alloy, each wing The hard alloy mill teeth of working face form a complete continuous milling covering surface.

For the utility model according to mineshaft diameter, junk mill size dimension is different, can be according to the specific size selection wing of junk mill Design number；Epimere has drill rod thread on its body, can be directly connected with macaroni.Body bottom portion is by wing area by spout It separates, hard alloy mill teeth is welded on the working face of wing, and Tooth arrangement design must make three wings form the company of completion Continuous milling covering surface.The working face of mill teeth must be by the central shaft of junk mill body, because the torque that wing generates at this time is most It is small（Eccentric wing can increase torque）.It is evenly equipped with hydrophthalmia on spout between wing, hydrophthalmia is the water outlet of water channel, hydrophthalmia It is connected with chamber body, liquid stream can be passed through.During milling operation, hydrophthalmia liquid stream washes away mill teeth, on the one hand takes away chip, on the other hand Help mill teeth cooling.Since wing is only in working face welding-on mill teeth, wing circumference is very big to thickness space, it is possible to be liquid stream Slot leaves enough spaces, and roomy spout is connected with the spout on outer body periphery, beneficial to chip removal.The milling of this junk mill Tooth milling depth of tooth penetration is big, milling efficiency is high；Hard alloy mill teeth intensity is big, and service life is long.

The utility model is provided with central platform between each wing, and each wing is connected by central platform, The central platform is wholely set with the junk mill body, described in the top pile-up welding hard alloy roll flute of the central platform The working face of hard alloy roll flute is flushed with the bottom face of the wing.It is not hollow tube to fall behind when underground, and center is put down Hard alloy roll flute on platform can play ablation, improve milling efficiency.

The utility model sets a roll flute limit rib in the middle part of the central platform, during hard alloy roll flute built-up welding and institute Roll flute limit rib is stated to weld together；Roll flute monoblock comes off when can prevent that junk mill from working by roll flute limit rib.

The front end face of wing described in the utility model sets two intersecting inclined-planes, and wing working face close to wing with working An auxiliary angle k is formed between the inclined-plane in face.This set quickly flows out junk mill beneficial to chip, avoids secondary milling or rolls pair Junk mill causes excessive wear.

Mill teeth is set multiple rows of from front to back on hard alloy mill teeth described in the utility model, is at least three rows.This set Mill teeth after front wing and mill teeth are worn, the mill teeth at rear can work on, based on this set so that the longevity of junk mill Life greatly extends.

Description of the drawings

Fig. 1 is a kind of structure diagram of the utility model；

Fig. 2 is the axial section of Fig. 1；

Fig. 3 is the top view of Fig. 1；

Fig. 4 is A direction views；

Fig. 5 adds up to mill teeth to arrange coverage diagram for hard.

Specific embodiment

As shown in Figure 1,2,3, 4, the utility model includes junk mill body 1, wing 6, hard alloy mill teeth 3, and wing 6 is three Road, each road wing 6 are distributed on 1 forepart of junk mill body, and the front end of each wing 6 is more than 1 front end of junk mill body；It is set in junk mill body 1 Axial bore 12 is put, 12 rear sidewall of axial bore sets drill rod thread 4, set in the junk mill body 1 in 12 front of axial bore Multiple tracks water channel 13, the water outlet 8 of each water channel 13 are separately positioned on 1 end face of junk mill body between each wing 6, and each water channel 13 divides It is not connected with the inner cavity of junk mill body 1 12；The lateral wall of junk mill body 1 is protruded in 6 side of wing respectively, two neighboring wing 6 with Spout 9 is formed between 1 lateral wall of junk mill body；Hard alloy mill teeth 3 is respectively welded at the lateral working face of wing 6, each knife The hard alloy mill teeth 3 of the working face of the wing 6 forms a complete continuous milling covering surface；If Fig. 5 signals are respectively three knives Coverage diagram 14-1,14-2,14-3 of hard alloy mill teeth on the wing.

Central platform 10 is provided between each wing 6, each wing 6 is connected by central platform 10, central platform 10 with Junk mill body 1 is wholely set, in the top pile-up welding hard alloy roll flute 2 of central platform 10, the working face of hard alloy roll flute 2 with The bottom face of wing 6 flushes.

One roll flute limit rib 11 is set at the middle part of central platform 10, during hard alloy 2 built-up welding of roll flute with roll flute limit rib 11 weld together.

The front end face of wing 6 sets two intersecting inclined-planes 7, and the inclined-plane 7-1 close to 6 working face of wing is higher than close to water channel The inclined-plane 7-2 of water outlet, wing working face and one auxiliary angle k of formation between the inclined-plane 7-1 of wing working face.

As shown in Fig. 2, Fig. 5, mill teeth sets four rows from front to back on hard alloy mill teeth 3, during work, the first gang milling before this Tooth works, and after abrasion, heel row mill teeth works.

The operation principle of this junk mill：By junk mill with drilling rod G.I.H, after milling operation starts, mud is beaten on ground into drilling rod Slurries, while junk mill is rotated clockwise with drilling rod, the 3 milling trouble of lost tool in hole of hard alloy mill teeth on junk mill.Mill teeth milling wedging Depth is big, milling efficiency is high, falls behind suitable for tubulose underground.If it is not hollow tube that underground, which is fallen behind, junk mill center is put down Hard alloy roll flute 2 on platform can play ablation.Slurry liquid in drilling rod is projected at a high speed by junk mill inner cavity and hydrophthalmia Junk mill washes away mill teeth, takes away chip, helps mill teeth cooling.

Claims (4)

1. a kind of efficient milling shoes, including junk mill body, wing, characterized by further comprising hard alloy mill teeth, the wing is extremely Shao Wei tri-, each road wing are distributed on the junk mill body portion, and the front end of each wing is more than the junk mill body front end； Axial bore is set in the junk mill body, and the axial bore rear sidewall sets drill rod thread, the mill in front of axial bore Multiple tracks water channel is set in shoes body, and the water outlet of each water channel is separately positioned on the junk mill body end face between each wing, each water Inner cavity of the road respectively with junk mill body connects；The lateral wall of the junk mill body is protruded in the wing side respectively, two neighboring Spout is formed between wing and junk mill outer body wall；The hard alloy mill teeth is respectively welded at the lateral work of the wing Make face, the hard alloy mill teeth of the working face of each wing forms a complete continuous milling covering surface, the wing Front end face sets two intersecting inclined-planes, wing working face and one auxiliary angle k of formation between the inclined-plane of wing working face.

2. efficient milling shoes according to claim 1, it is characterised in that be provided with central platform between each wing, respectively The wing is connected by central platform, and the central platform is wholely set with the junk mill body, in the central platform Top pile-up welding hard alloy roll flute, the working face of the hard alloy roll flute are flushed with the bottom face of the wing.

3. efficient milling shoes according to claim 2, it is characterised in that in the middle part of the central platform roll flute is set to limit Position muscle, when hard alloy roll flute built-up welding, weld together with the roll flute limit rib.

4. efficient milling shoes according to claim 1, it is characterised in that mill teeth is set from front to back on the hard alloy mill teeth Put multiple rows of, at least three rows.