CN2251036Y

CN2251036Y - Drag bit

Info

Publication number: CN2251036Y
Application number: CN 94223120
Authority: CN
Inventors: 吴宪文; 杨文生; 柏景海; 刘振明
Original assignee: DRILLING TECHNIQUE SERVICE Co DAQING PETROLEUM ADMINISTRATION; Well Drilling Co No2 Daqing Petroleum Administration
Current assignee: DRILLING TECHNIQUE SERVICE Co DAQING PETROLEUM ADMINISTRATION; Well Drilling Co No2 Daqing Petroleum Administration
Priority date: 1994-10-18
Filing date: 1994-10-18
Publication date: 1997-04-02
Anticipated expiration: 2004-10-18

Abstract

The utility model discloses a drag bit with three blades, which is wearable and is not easy to break off. The three blades 1 are inlaid on a bit body 4. The inner of each blade 1 is a straight plane (5). The included angle of each blade and the horizontal plane is 78 DEG. The rear face of the working end of each blade forms a step body (6), and vertical diamond columns (7) and oblique diamond columns (8) with 45 DEG are also inlaid in the blades. A water faucet (2) extends out a bit cap (3). By the improvements, the utility model can realize design tasks.

Description

Drag bit

The utility model relates to a kind of drag bit of oil drilling.

Drill bit is the oil field instrument that broken formation creeps in drilling process, divides scraper, gear wheel, PCC, gets drill bit such as core.The general soft face of land, in soft harder stratomere all adopt drag bit, it is simple to operate, is difficult for mud drum, rate of penetration is higher.The three-winged bit of current use, bit body stud with three wings, and each wing the inside work plane forms a contour body, because drill bit is subjected to moment of torsion big in the course of the work, and the wing phenomenon that fractures; The impregnated wear-resisting diamond post of scraper lamellar body, because diamond post welding-on direction favours 45 ° of scraper lamellar bodies, usually, outside diameter is diminished because of making the diamond post head be exposed to external frangibility after the wearing and tearing, directly influence the hole diameter that is got out, hole diameter diminishes lock of tool drilling easily takes place; The angle that wing active section (with the stratum contact-segment) and horizontal plane arranged again is big (being generally 82 °), can not bear bigger shearing force.

The purpose of this utility model is to avoid weak point in the above-mentioned prior art, and a kind of wear-resisting not frangibility ground (three) drag bit is provided.

The purpose of this utility model can reach from following technical scheme: make to be straight plane on the bit body inside each wing, the angle on wing and formation water plane is 78 degree, can improve the intensity of wing; The back of the working end of wing (or front) forms step body, the vertical diamond post of insert in the step body, and wherein nozzle stretches out the drill bit cap, can realize purpose of design by above-mentioned improvement.

The utility model can have following effect than above-mentioned present technology; Owing to improved the angle on wing and formation water plane, can improve the intensity of wing; The vertical diamond post of insert can improve anti-wear performance, makes water nozzle stretch out the favourable raising hydraulic drilling of drill bit cap effect, can improve the rate of penetration of drill bit.

Fig. 1, the 2nd, three-winged bit master, vertical view;

Fig. 3 is Fig. 1 upper blade sheet 1 monomer figure;

Fig. 4 is Fig. 3 rear elevation.

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

, had 3 wings 1 to be installed on the shell bit body 4 on the drag bit and claim three-winged bit in conjunction with shown in Figure 2 by Fig. 1, three scraper bodies form a circular work plane, get out the cylindrical shape well.The utility model is to have done a little improvement on wing 1 and hydrophthalmia 2, and the inside of each wing 1 is straight plane 5, and interior thickness is increased, and wing behind the insert and horizontal plane angle are 78 °, can improve the intensity of blade, not frangibility.(or preceding) face forms step body 6 behind the wing working end, makes operative end surface at the beginning thinner, can improve rate of penetration at broken ground; With creeping into wearing and tearing back operative end surface thickening, diamond increases, and not easy to wear than hard formation, improve and protects the footpath performance.In the wing on the basis of welding-on inclination diamond post 8 again in 6 li welding-ons of step body vertical diamond post 7, can improve the cutter blade anti-wear performance, make external diameter constant.The nozzle 2 that is installed in 3 li on drill bit cap stretches out outside the drill bit cap, shortens the spray square, improves the broken rock of jet and washes end ability, the repetition fragmentation of landwaste do not occur, favourable raising rate of penetration.

Claims

1, a kind of oil drilling (3) drag bit is gone up insert three wings (1) by bit body (4) and is constituted, and it is characterized in that; Each wing (1) the inside is straight plane (5), and wing and horizontal plane angle are 78 °, and wing end back or front form step body (6), stud with vertical diamond post (7) in step body (6) lining; Wherein bit body top nozzle (2) stretches out drill bit cap (3).