CN2213834Y

CN2213834Y - Spiral screw shape short wing compound piece bit

Info

Publication number: CN2213834Y
Application number: CN 95206448
Authority: CN
Inventors: 许钰
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-27
Filing date: 1995-03-27
Publication date: 1995-11-29
Anticipated expiration: 2005-03-27

Abstract

The utility model discloses a bit with spiral-thread-shaped short wings and composite sheets, belonging to a bit for breaking rock in well bottom for petroleum drilling engineering, comprising a bit body, knife wings, diameter-protecting righting blocks and a bit nozzle. The utility model is characterized in that the spherical cap of the bit body is ellipsoidal; the threaded short knife wings are smoothly welded with the diameter-protecting righting blocks into integration. Three knife wings are uniformly distributed on the bit body to form 'three male threads'. Besides, the composite sheets are embedded and ranged in 4 layers and 5-10 rows in the base body of each knife wing and are in a jagged shape in side front of the knife wing. The bit collects two characteristics of a drag bit and an abrasive bit, serves for both soft and hard formations and serves as a special bit used in the petroleum drilling engineering.

Description

Spiral screw shape short wing compound piece bit

The utility model belongs to drill bit, the drill bit of using especially for broken bottom rock in the petroleum drilling engineering.

At present, being used for the drill bit that broken bottom rock uses in the petroleum drilling engineering can be divided three classes, wherein:

1 class is a rock bit: utilize tooth hard on the gear wheel that rotates on the drill bit, powerful rolling realizes the work of fractured rock in the shaft bottom.Be applicable to than hard formation more.

2 classes are drag bits: it has the long thin type blade of three radiation-like, with the broken rock of the mode of shoveling or scraping stripping.Be applicable to soft formation more.

3 classes are abrasive drills: at the drill bit welding-on diamond particles or other high-abrasive materials are arranged, with the lapping mode fractured rock.Be applicable to hard or extremely hard formation more.

The shortcoming of above drill bit is soft, the hard formation to Different Strata, needs conversion to select different drill bits for use.

The purpose of this utility model is a kind of drag bit and abrasive drill two specific characters of integrating of design, to soft, the hard formation thread-shaped short limb compact bit that spirals all applicatory.

The utility model is to realize like this.Improve existing drill bit, change drill bit into elliposoidal or taper; Change the inclined to one side rimmer knife wing into thread-shaped short and thick wing; Wing and wiper block is smoothly integrally welded, three groups of wings are distributed on the bit body, form " three pin thread ".

The utility model is a kind of thread-shaped short limb compact bit that spirals, comprise bit body 1, wing 2, protect footpath wiper block 3 and bit nozzle 6, the spherical crown 4 that it is characterized in that bit body 1 is elliposoidal, wing 2 is thread-shaped short sword wings, wing 2 and guarantor footpath wiper block 3 smoothly are welded and fused, three groups of wings are distributed on the bit body 1, form " three pin thread ".

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1, drill bit structure schematic diagram (composite sheet on the wing is not drawn).

Fig. 2, drill bit upward view (composite sheet on the wing is not drawn).

Fig. 3, composite sheet are arranged schematic diagram in lines at the wing higher slice.

The 3-a schematic bottom view

The 3-b front schematic view.

3-c side front view.

Referring to Fig. 1, Fig. 2, drill bit of the present utility model mainly is made up of bit body 1, wing 2, guarantor's footpath wiper block 3 and bit nozzle 6, and wherein the spherical crown 4 of bit body is elliposoidal; Wing 2 is short and thick; Wing 2 smoothly is welded and fused with protecting footpath wiper block 3, and three groups of wings are distributed on the bit body 1, form " three pin thread ".

Referring to Fig. 3-c, in wing 2 matrixes, divide 4 layer of 5～10 row to arrange, be inlaid with composite sheet 5.Composite sheet divides 4 layer of 5 row arrangement to be embedded in the wing matrix among the embodiment.After the 1st layer of wearing and tearing in wing surface, the 2nd layer is exposed and the broken rock of continuation at once, successively wears up to last one deck, and bit life is just scrapped.Existing drill bit only has one deck composite sheet on the surface, so the life-span is short.

Referring to Fig. 2, wing 2 is short and thick, can keep the stripping effect of scraping of scraper like this, can have the grinding function again.

Referring to Fig. 3-a, composite sheet is embedded in the wing matrix by different level wing front indentation.Referring to Fig. 3-b, in drill bit when work,, this work plane can grind, and can keep the stripping effect of scraping of general drag bit again.

Referring to Fig. 3-c, during drill bit work, the form of this work plane such as milling cutter is carried out the broken rock of reaming.Help quick fractured rock.The utility model drill bit collection drag bit and abrasive drill two specific characters all are suitable for soft, hard formation, are the extraordinary drill bits that petroleum drilling engineering uses.

Claims

1, a kind of thread-shaped short limb compact bit that spirals, comprise bit body 1, wing 2, protect footpath wiper block 3 and bit nozzle 6, the spherical crown 4 that it is characterized in that bit body 1 is elliposoidal, wing 2 is thread-shaped short sword wings, wing 2 is smoothly integrally welded with guarantor footpath wiper block 3, three groups of wings are distributed on the bit body 1, form " three pin thread ".

2, by the described thread-shaped short limb compact bit that spirals of claim 1, it is characterized in that in wing 2 matrixes, dividing 4 layer of 5～10 row to arrange, be inlaid with composite sheet 5.

3, by the described thread-shaped short limb compact bit that spirals of claim 2, it is characterized in that composite sheet 5 being embedded in by different level in wing 2 matrixes at wing front indentation.

4, by the described thread-shaped short limb compact bit that spirals of claim 1, it is characterized in that the spherical crown 4 of bit body 1 can be tapered.