CN201162493Y

CN201162493Y - Bidirectional drill-following reamer blade

Info

Publication number: CN201162493Y
Application number: CNU200720082268XU
Authority: CN
Inventors: 李黔; 李润
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2007-12-04
Filing date: 2007-12-04
Publication date: 2008-12-10
Anticipated expiration: 2017-12-04

Abstract

The utility model relates to a two-way reamer blade used for reaming holes during petroleum and natural gas drilling, which solves the problem of the prior reamer that forward reaming and back reaming can not be conducted at the same time, and the problems of wear and cutting of the toothed cutter and so on. The technical proposal is that PDC laminate sheet toothed cutters are inlaid on the upper coronary face and the lower coronary face of the blade; the two coronary faces of the blade are in short parabolic curve outline; a front line and a back line of the toothed cutters are arranged on each of the coronary faces, and the two lines are staggered in position; a gauge protection block is arranged between the upper coronary face and the lower coronary face, and gauge teeth are inlaid on the gauge protection block; oblique sliding chutes are arranged on both sides of the blade. The blade is directly arranged in the hole of the reamer body so that the oblique sliding chutes on both sides are matched with oblique sliding chutes on the two wall faces of the hole of the reamer body. The two-way reamer is arranged between a drill bit and a drill collar. After the two-way reamer is lowered to the hole section to be reamed, the pump displacement is increased. In this way, the hole can be reamed. The blade is simple in structure, and installed and used conveniently with long performance life, which can be widely applied for reaming holes in the stratum during petroleum and natural gas drilling.

Description

A kind of two-way drill-following reamer wing

Technical field

The utility model relates to a kind of two-way drill-following reamer wing that the oil and gas well drilling well enlarges that is used for, and belongs to the oil and gas well drilling hole opening device.

Background technology

In recent years since, the application along with the complicated well drilling technology of deep-well has had higher requirement to the underreamer instrument.In the drilling well of deep layer saline bed, problem that stratum undergauge problem will cause that bit freezing, well are dwindled etc., thus bring a series of down-holes complex accident, this situation need be carried out both forward and reverse directions reaming hole repeatedly when creeping into.In deep drilling, adopt little gap casing program, can reduce the shaft building cost greatly, improve well cementation completion quality, with boring the reaming hole technology supporting technology that is absolutely necessary.Existing diplocardia (off-centre) drill bit, moment of torsion is big in drilling process, the jumping of spraining is serious, and drill bit and drill string have all been caused infringement in various degree; Some drill-following reamers can not be realized two-way reaming, or do not adopt parabola shaped appearance profile wing, make that the cutting element uneven wear is serious, cause the life-span of reamer blade short, and it is fast to lose efficacy, and can not well satisfy reaming hole operation needs.

Summary of the invention

The purpose of this utility model is: for solve existing reamer can not realize simultaneously wearing and tearing such as positive reaming hole and back reaming and cutting teeth, etc. cut problem such as design, the spy provides a kind of two-way drill-following reamer wing.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of two-way drill-following reamer wing, be made up of wing body 1, PDC composite sheet cutting teeth 5 and gauge teeth 4, its architectural feature is: PDC composite sheet cutting teeth 5 is embedded on the upper and

lower crown

2,6 of wing body 1; Upper and

lower crown

2,6 profiles of wing body 1 all adopt short parabolic outlines crown; Leave oblique chute 7 on the crown of wing body 1, two row's cutting teeths 5 before and after arranging respectively on the crown, and the axial location of two row's cutting teeths 5 staggers mutually; The footpath of guarantor piece 3 is arranged between the upper and

lower crown

2,6, and gauge teeth 4 is embedded in to be protected on the piece 3 of footpath.Wing body 1 is directly installed in the fenestra 9 of reamer body 8, the oblique chute 7 of both sides and the oblique chute of 9 liang of walls of fenestra is cooperated, and wing is carried out radial constraint; Wing 10 is equipped with block up and down, and wing 10 is carried out axial constraint; Two-way reamer is connected between drill bit and the drill collar, after the well section that need carry out reaming hole, strengthens pumpage down, just can realize the reaming hole operation.When underground work, reamer blade is released by high-pressure slurry by force in the well section that needs reaming hole, and reamer is under rotation status, and cutting teeth constantly cuts the borehole wall, makes well extended.When needing back reaming, on carry drilling tool, reamer is in uphill process, the top cutting teeth is the machinable borehole wall just, realizes back reaming.

The beneficial effects of the utility model are: short parabolic outline crown and staggered complex cloth tooth are adopted in wing body two ends, can improve the quality of the borehole wall, can improve the uniformity of cutting teeth wearing and tearing again, prolong the life-span of reaming hole wing; This wing is simple in structure, easy to install, the life-span is long, can be widely used in oil and gas well drilling the reaming hole operation is implemented on the stratum.

Description of drawings

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

Accompanying drawing 1 is the structural representation of the two-way drill-following reamer wing of the utility model.

Accompanying drawing 2 is installed in structural representation in the reamer for the utility model wing.

Among the figure on 1. wing bodies, 2. wings crown 3. protect crown 7. oblique chute 8. reamer bodies 9. reamer fenestras 10. wings under piece 4. gauge teeth 5.PDC composite sheet cutting teeths 6. wings of footpath

The specific embodiment:

According to shown in Figure 1, the utility model mainly is made up of wing body 1, PDC composite sheet cutting teeth 5 and gauge teeth 4, and the wing body is processed with short parabola shaped last crown 2 and following crown 6 respectively in two ends about in the of 1.Two row PDC composite sheet cutting teeths 5 are arranged gauge teeth 4 on the middle guarantor footpath piece 3 before and after arranging respectively on the crown, are processed with chip area between the row of two on the crown PDC composite sheet cutting teeth 5.

According to shown in Figure 2, wing 10 is directly put into the fenestra 9 of reamer body 8, the oblique chute of the oblique chute 7 of wing 10 both sides and 9 liang of walls of fenestra cooperates, and wing carried out radial constraint, wing 10 is equipped with block up and down, wing 10 is carried out axial constraint, two-way reamer is connected between drill bit and the drill collar, after the well section that need carry out reaming hole, strengthen pumpage down, after reamer body 8 inside and outside differential pressures are increased to certain value, drive wing 10 and stretch out, the reaming hole operation is implemented on the stratum along oblique chute, along with constantly transferring of drilling tool, well will be extended under the cutting of reaming hole wing 10; When carrying out the back reaming operation, on carry drilling tool, the top cutting teeth of wing 10 upwards cuts the borehole wall, the top well is extended.In the reaming hole process, because the appearance profile of 10 liang of crowns of wing is to adopt the weak point that waits wearing and tearing and wait the cutting principle to design parabola shaped, so PDC composite sheet cutting teeth 5 balance abrasion roughly in working angles, make its life-span near maximum value.On 10 liang of crowns of wing two row PDC composite sheet cutting teeth 5 is that dislocation is arranged, in cutting borehole wall process, the covering borehole wall that their movement locus envelope can be good obtains good borehole wall quality.After the reaming hole operation is finished, reduce pumpage, after reamer body 8 inside and outside pressure reduction were reduced to certain value, inner return spring promoted reamer blade 10 along the oblique orbit withdrawal, is convenient to pull out of hole.

Claims

1. a two-way drill-following reamer wing is made up of wing body, PDC composite sheet cutting teeth and gauge teeth, it is characterized in that: PDC composite sheet cutting teeth (5) is embedded on the upper and lower crown (2), (6) of wing body (1); Wing body (1) two crown (2), (6) profile all adopt short parabolic outlines crown; Oblique chute (7) is left in the both sides of wing body (1), two row's cutting teeths (5) before and after arranging respectively on the crown, and the axial location of two row's cutting teeths (5) staggers mutually; The footpath of guarantor piece (3) is arranged between upper and lower two crowns (2), (6), and gauge teeth (4) is embedded in to be protected on the footpath piece (3).