CN202370435U

CN202370435U - Blade PDC bit

Info

Publication number: CN202370435U
Application number: CN2011205427876U
Authority: CN
Inventors: 谢世龙; 冯永孝; 刘富伟; 牛战波; 郭超
Original assignee: HENAN SHENLONG PETROLEUM DRILLING TOOLS CO Ltd
Current assignee: HENAN SHENLONG PETROLEUM DRILLING TOOLS CO Ltd
Priority date: 2011-12-22
Filing date: 2011-12-22
Publication date: 2012-08-08
Anticipated expiration: 2021-12-22

Abstract

The utility model discloses a blade PDC bit, which comprises blades, PDC cutting teeth, nozzles, chip grooves, a bit gauge protection part and a bit body, wherein the blades are fixed on a crown head part of the bit body, and include main blades and short blades; the main blades and the short blades are uniformly distributed at intervals; the tail ends of the three main blades extend to be connected and supported mutually; for 8.5'' bits, the distance from the short blades to the centers of the bits are 45mm, 55mm, and 65mm respectively; the backside of each blade form an inclined angle of 8 degrees to 12 degrees together with the center line of the crown head of the bit body; the thickness of the blades increases gradually in the direction far from the bits; the tail parts of the blades take the shape of a parabolas; the PDC cutting teeth are arranged on the blades; the chip grooves are arranged between adjacent blades; and a fixed nozzle and an adjustable nozzle are inserted in the bit body. According to the blade PDC bit, the shapes of the main blades and the distribution of the nozzles and the water holes are adjusted on basis of a previous bit structure, so that the blade PDC bit can be satisfactorily prevented from abrading in diameter, the formation of bit bouncing and bit balling can be prevented, the service life of the blade PDC bit is prolonged, and the well building period is shortened. The blade PDC bit is also applicable to drilling of extra-deep wells and complex wells of oil and gas.

Description

A kind of blade PDC bit

Technical field

The utility model relates to the drilling tool in a kind of coal bed gas drilling process, the blade PDC bit of hard in especially adapting to, hard block.

Background technology

Coal bed gas block geological structure is complicated, and stratigraphic horizon is staggered, and soft and hard mixed mutually, also there is gravel in some block, causes drill bit to use quick abrasion.For many years, the cbm development drilling well uses tricone bit to creep into always, but rock bit is not wear-resisting, slow when cutting brill; Conventional PDC drill bit comprises that six wing PDC drill bits are to inlay cylindric composite polycrystal-diamond at bizet wing place, because phenomenons such as each wing independently separately, very easily fractures, quick abrasions.In drilling process, often because of formation variation and drill bit is former thus pull out of hole midway, bit change more, not only driller's labour intensity strengthens, and also causes drilling period to prolong, and increases drilling team's cost of production.

Summary of the invention

The problem that the utility model exists to above-mentioned prior art; A kind of blade PDC bit is provided, geometry, the bit port that has six wing PDC drill bit wings now carried out optimal design, can solve complex formation and change greatly; Rock is hard; Drill bit is easy to wear, the problem that drilling speed is slower, and this drill bit is applied widely, overall efficiency is high.

The utility model adopt technical scheme following:

This blade PDC bit; Comprise wing, PDC cutting teeth, nozzle, chip area, bit gauge protection part and bit body, bit body crown head partial fixing wing is arranged the PDC cutting teeth on the wing; Between the adjacent wing chip area is set, is inlaid with nozzle on the bit body.Wing has the operator wing and the short sword wing, and the operator wing and short sword are interplane at a distance from being uniformly distributed with, and the end extension of three operator wings links to each other and supports each other.

The distance of said short sword foilbase bit central is respectively 45mm, 55mm, 65mm.

Said each wing back becomes 8 ° of-12 ° of inclination angles with bit body crown head center line, the thickness of wing is with apart from the distance of blade and progressive additive, and afterbody is parabolic shape.

Said nozzle has fixed nozzle and adjustable nozzle, reserves into hole shape during the casting of fixed nozzle sintering, and annular distribution is at the front end of the short sword wing; Adjustable nozzle is evenly arranged in the hydrophthalmia hole near the bit body internal diameter at the bottom of the chip area, and the internal thread of reserving when casting with sintering connects.

The hydrophthalmia hole that said nozzle is mated is the going up or down stairway formula and arranges, and can increase the impact force of mud to the shaft bottom, shaft bottom convenient for cleaning and broken formation.

Said adjustable nozzle is the bit nozzle of φ 14～φ 22.

The beneficial effect of the utility model is; On the basis of existing drill bit structure, adjusted the shape of the operator wing and the distribution in nozzle and hydrophthalmia hole, can guarantee preferably that bit diameter is not worn, and prevents the formation of drill bit bit bouncing, mud drum; Prolong drilling life of bit, thereby shorten well construction period.This utility model also is applicable to the ultradeep well of oil, natural gas and the probing of complex hole condition.

Description of drawings

Fig. 1 is the structural representation of blade PDC bit;

Fig. 2 is the elevation of blade PDC bit.

The specific embodiment

Further introduce the embodiment of the utility model below in conjunction with accompanying drawing.

As depicted in figs. 1 and 2, this blade PDC bit comprises wing, PDC cutting teeth 3, nozzle, chip area 6, bit gauge protection part 7 and bit body 8.

Wing partly comprises three operator wings 1, three short sword wings 2, and φ 16 polycrystalline diamond PDC cutting teeths are being inlayed at the front row on each wing, and back row inlays φ 13 polycrystalline diamond PDC cutting teeths; Chip area 6 is set between the adjacent wing; Nozzle has fixed nozzle 4 and adjustable nozzle 5, and adjustable nozzle 5 is according to the nozzle of geological conditions and the replaceable different inner diameters of drilling well needs, with the regulating pondage size; Bit gauge protection part 7 is the external diameter of drill bit, is inlaid with the sheet composite polycrystal-diamond; Bit adapter partly is a bit body 8, and the screw thread of its outer radius portion can connect with different drill strings.The PDC bit central partly is a hollow pipe network shape, and the circulation of inner confession drilling fluid is finally in fixed nozzle 4 and the ejection of adjustable nozzle 5 places, in order to cooling, cleaning, lubricated cutting teeth.

For improving wing intensity, the end of three operator wings 1 extends continuous, and interweaving is one, supports each other, constitutes three firm intersections, has reduced drill bit wing pressure-bearing surface; The short sword wing 2 and the operator wing 1 at interval equal portion, " distance of the short sword foilbase bit central of drill bit is respectively 45mm, 55mm, 65mm, can suitably dwindle or amplify for this distance of drill bit of other size for 8.5; Each wing back becomes 8 °～12 ° inclination angles with bit body crown head center line, the thickness of wing is with apart from the distance of blade and progressive additive, and afterbody is parabolic shape.

Be the impact force of increase mud to the shaft bottom, shaft bottom convenient for cleaning and broken formation, designs of nozzles becomes going up or down stairway formula hydrophthalmia to arrange; Outwards the number first lap is a fixed nozzle 4 from the drill bit central axis footpath, reserves into hole shape during the sintering casting, and annular distribution is at the front end of the short sword wing; Second circle is an adjustable nozzle 5, is evenly arranged in the hydrophthalmia hole near the bit body internal diameter at the bottom of the chip area, and the internal thread of reserving when casting with sintering connects, the bit nozzle of hole dimension φ 14～φ 22 in can installing.

Combine accompanying drawing that the utility model preferred implementation has been done detailed description above; But the utility model is not limited to above-mentioned embodiment; All variations of in the essential scope of the utility model, making, remodeling, interpolation or replacement all should belong to the protection domain of the utility model.

Claims

1. a blade PDC bit comprises wing, PDC cutting teeth, nozzle, chip area, bit gauge protection part and bit body, bit body crown head partial fixing wing; Arrange the PDC cutting teeth on the wing; Between the adjacent wing chip area is set, is inlaid with nozzle on the bit body, it is characterized in that: wing has the operator wing and the short sword wing; The operator wing and short sword are interplane at a distance from being uniformly distributed with, and the end extension of three operator wings links to each other and supports each other.

2. blade PDC bit according to claim 1 is characterized in that: the distance of said short sword foilbase bit central is respectively 45mm, 55mm, 65mm.

3. blade PDC bit according to claim 1 and 2 is characterized in that: said each wing back becomes 8 ° of-12 ° of inclination angles with bit body crown head center line, and the thickness of wing is with apart from the distance of blade and progressive additive, and afterbody is parabolic shape.

4. blade PDC bit according to claim 1 and 2 is characterized in that: said nozzle has fixed nozzle and adjustable nozzle, reserves into hole shape during the casting of fixed nozzle sintering, and annular distribution is at the front end of the short sword wing; Adjustable nozzle is evenly arranged in the hydrophthalmia hole near the bit body internal diameter at the bottom of the chip area, and the internal thread of reserving when casting with sintering connects.

5. blade PDC bit according to claim 4 is characterized in that: the hydrophthalmia hole that said nozzle is mated is the going up or down stairway formula and arranges.

6. blade PDC bit according to claim 4 is characterized in that: said adjustable nozzle is the bit nozzle of φ 14～φ 22.