CN202483462U

CN202483462U - Self-filtration drill bit with diamond composite lengthened nozzle

Info

Publication number: CN202483462U
Application number: CN2012201173841U
Authority: CN
Inventors: 桂哲; 金锋; 文磊
Original assignee: BEIJING MINGTAI HECHUANG TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: BEIJING MINGTAI HECHUANG TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2012-03-26
Filing date: 2012-03-26
Publication date: 2012-10-10
Anticipated expiration: 2022-03-26

Abstract

The utility model relates to a self-filtration drill bit with a diamond composite lengthened nozzle, and mainly solves the problems that the hard alloy nozzle of the conventional polycrystalline diamond compact (PDC) drill bit is low in structural strength, and mud wraps the drill bit because of upwards returned mud in a drill rod during drilling. The self-filtration drill bit is characterized in that composite diamond (10) is arranged in the nozzle (9); alloy steel (11) is embedded outside the composite diamond (10); the front end of the nozzle (9) is arranged outside a blank body (2); and the inner part of the blank body (2) is connected with a check valve (6). The drill bit is high in intensity and can resist impact; the hydraulic spraying effect can be enhanced; and the upwards returned mud can be filtered, so that the phenomenon that the mud wraps the drill bit is avoided.

Description

A kind of diamond combination extended jet nozzle inherent filtration drill bit

Technical field

The utility model relates to the probing field, is a kind of diamond combination extended jet nozzle inherent filtration drill bit specifically.

Background technology

In the field drilling field, polycrystalline diamond compact bit (PDC) is compared with old-fashioned drill bit owing to the characteristics that its high abrasion, height do impact are widely used, and it can reduce the oilfield exploitation cost, accelerate exploitation rate, increases economic efficiency.But present PDC bit nozzle is carbide alloy mostly, because of its structural strength is low, and can only imbed bit matrix inside, has reduced the effect of jetting; Simultaneously since drill bit in going down process, return mud on the drilling rod inside and be difficult to cleaning causes the deposition of the inner high density solid phase particles of drilling rod, causes the PDC bit balling.

Summary of the invention

In order to overcome low, the return mud and cause the deficiency of bit balling on the drilling rod inside when boring down of existing P DC drill bit carboloy nozzle structural strength; The utility model provides a kind of diamond combination extended jet nozzle inherent filtration drill bit; Diamond nozzle intensity height, the shock resistance of this drill bit, can improve the effect of jetting; Simultaneously can on the mud that returns filter, avoid causing bit balling.

The technical scheme of the utility model is: a kind of diamond combination extended jet nozzle inherent filtration drill bit; The idiosome that comprises drill collar and front end thereof; The front end of idiosome is fixed with nozzle, and described nozzle interior is a composite diamond, and the composite diamond outside is inlaid with alloy steel; Spray nozzle front end is in the outside of idiosome, and described idiosome is internally connected with one way valve.

Be provided with the one way valve filter screen in the described one way valve.

The utlity model has following beneficial effect: owing to take such scheme; This drill bit nozzle inside is composite diamond; Make it increase greatly, improved structural strength, guarantee to exceed the structural strength and the impact strength of bit matrix from wear resistance ratio; Can shorten the distance of nozzle, strengthen the effect of jetting to the shaft bottom; Owing to be provided with the one way valve that has screen pack in the carcass, screen pack is blocked in the bulky grain solid phase outside the drilling rod simultaneously, can not cause the inner high density solid phase of drilling rod to pile up, and avoids damaging drilling rod and borehole instruments.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the sectional view of the utility model;

Fig. 3 is the upward view of the utility model;

Fig. 4 is a structure of nozzle sketch map in the utility model.

1-drill collar among the figure, the 2-idiosome, 3-bores tooth, 4-loop bar, 5-back-moving spring, 6-one way valve, 7-one way valve filter screen, 8-one way valve locking nut, 9-nozzle, 10-composite diamond, 11-alloy steel.

The specific embodiment

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

Extremely shown in Figure 3 by Fig. 1; A kind of diamond makes up extended jet nozzle inherent filtration drill bit, comprises the idiosome 2 of drill collar 1 and front end thereof, and the front end of idiosome 2 is fixed with nozzle 9; Described nozzle 9 inside are composite diamond 10, and composite diamond 10 outsides are inlaid with alloy steel 11 as link.Because the abrasion resistance of composite diamond is good, it can reach 100,000 from wear resistance ratio, has so just improved the impact strength of nozzle greatly; The outside is inlaid with alloy steel 11, has so just improved structure of nozzle intensity greatly, owing to improved structural strength; Therefore nozzle 9 is compared with existing nozzle, and length just can extend, the outside that nozzle 9 front ends are stretched out idiosome 2; Nozzle is shortened more than one times to bottom hole spacing, strengthen the effect of jetting greatly.In drilling process; The short-circuiting effect of the fluid in the bit nozzle pressure drop; Make that larger-diameter nozzle is always destroyed by rush of water prematurely in the drill bit; And diamond nozzle can be stopped this phenomenon fully, guarantees effective injection drop under rated discharge for a long time, and this is huge to the influence that improves bit speed.

Described idiosome 2 is internally connected with one way valve 6, and one way valve 6 inside are provided with loop bar 4, is provided with back-moving spring 5 between the valve pocket of loop bar 4 and one way valve 6, is provided with one way valve filter screen 7 in the described one way valve 6, and fixing through one way valve locking nut 8.One way valve 6 carries strainer valve, can solve in the going down process cleaning difficult problem of return mud on the drilling rod inside.Since the structure of one way valve 6, but make mud all-pass mistake from top to bottom, and mud then must be blocked in the bulky grain solid phase outside the drilling rod through the spool narrow slit from the bottom up.This has very large benefit to the turn on pump circulation after boring down, can not cause the accumulation of the inner high density solid phase of drilling rod, damage drilling rod and directional well instrument.Avoid causing turn on pump to wash away deposit drill hammer hydrophthalmia the bit port initial stage is just damaged, and cause the PDC bit balling.

Claims

1. a diamond makes up extended jet nozzle inherent filtration drill bit; The idiosome (2) that comprises drill collar (1) and front end thereof; The front end of idiosome (2) is fixed with nozzle (9), it is characterized in that: described nozzle (9) is inner to be composite diamond (10), and composite diamond (11) outside is inlaid with alloy steel (92); Nozzle (9) front end is in the outside of idiosome (2), and described idiosome (2) is internally connected with one way valve (6).

2. diamond combination extended jet nozzle inherent filtration drill bit according to claim 1 is characterized in that: be provided with one way valve filter screen (7) in the described one way valve (6).