CN2141835Y

CN2141835Y - Mixed multi-drag type bit

Info

Publication number: CN2141835Y
Application number: CN 92236955
Authority: CN
Inventors: 赵升吉
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-16
Filing date: 1992-10-16
Publication date: 1993-09-08
Anticipated expiration: 2002-10-16

Abstract

The utility model relates to a mixed multi-drag type bit used for oilfield well drilling. On the basis of an original three-drag bit, the utility model is added with three short and narrow drags, and the six drags adopt a flat structure, that is a basal plane is consistent with a cutting plane. In the drilling work, three drags firstly contact with crushing rocks on the well bottom, when the three drags are worn and the stratum is hard, the other three small drags can simultaneously contact with the well bottom, so the three drag bits can be naturally changed into six drags, and six drags can jointly cut the crushing rocks rock in later period. Therefore, the utility model can remarkably increase the drill footage and the penetration rate and can create condition for rapid drilling more than 1200 meters of an excellent drill bit.

Description

Mixed multi-drag type bit

The utility model relates to a kind of drag bit that is used for the oil field well-digging, belongs to the many drag bits of mixed type.

At present, dig a well with three wing drill bits to soft location in the oil field.Be generally 1200 meters middle-deep wells for Daqing oil field, the location, top is softer, and the half well can be scraped the brill cutter with one three can bore a bite well, but the later stage rate of penetration is lower, and average single footage per bit is 950 meters, needs the trip-out bit change.Prolong completion period like this, increased the individual well cost, also increased the opportunity that down-hole accident takes place simultaneously.The application is proposed for these reasons.

The purpose of this utility model is to avoid weak point in the above-mentioned prior art, and proposes a kind of many drag bits of mixed type that improve drilling depth and drilling speed, can satisfy the purpose of having bored well depth in 1200 meters fast in drill bit high-quality of Daqing Area.

The purpose of this utility model can reach by the following technical programs: it constitutes on three-winged bit; But the cutting face of all wings and basal plane are on a plane, at 3 uniform three little wings 1 of three big wings, all wings all are welded in bit body 5 by the cutting angle direction of designing requirement and divide on the fluid 7, and it is short and narrow that little wing 1 is compared big wing 3.

The utility model has following effect than prior art: the varying number wing is adopted in different locations, can adopt an effective measure, and significantly improves the drill bit abrasion resistance, thereby improves the drill bit total footage.Wing adopts flat structure on the other hand, not only makes to bring convenience; Also want the doctor blade structure compactness, can reduce the drill bit bearing area, can shorten jet length, increase is compared water-horse power in creeping into.So obvious raising drilling depth and rate of penetration can reduce the number of times that makes a trip, and shorten completion period, reduce drilling cost.This drill bit is not only applicable to Daqing oil field and is applicable to that other oil drillings use yet.

Fig. 1 is the utility model front view

Fig. 2 is the vertical view of Fig. 1

Fig. 3 is an A-O sectional drawing on 1

Fig. 4 is the utility model wing figure

Fig. 5 is former three-winged bit wing figure

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

By uniform six wings on bit body 5 shown in Fig. 1 .2 and the shunt head 7.Its medium and small wing 1 has three, and big wing 3 has three cross arrangements.Little wing 1 compare big wing 3 width and length little.Each wing all adopts the cutting face flat structure consistent with basal plane by the cutting angle of designing requirement installation wing in the right direction, and totally six of hydrophthalmia 4(are all arranged between each wing).Can adopt three hydrophthalmias (every big small blade is done one group of appropriate location and established a hydrophthalmia) according to stratum and drilling equipment situation.

This drill bit all adopts former three-winged bit manufacturing process, and 6 is the edge glomerocrysts of applying arbitrarily on Fig. 2, and the 7th, shunt head, the 2nd, stiff dough (tungsten carbide powder mixes composition with casting carbon tungsten carbide particle).

The top soft formation is earlier with three big wing 3 contact shaft bottom fractured rocks when adopting this drill bit to creep into, when it weares and teares to a certain degree stratum hardening, the later stage is crept into six wings while fractured rocks in three little wings 1 contact shaft bottoms, and so smooth brill finishes more than 1200 meter deep-well.

Claims

1, a kind of many drag bits of mixed type that are used for the oil field well-digging: it constitutes on three-winged bit; Its feature: all wings all adopt the cutting face at consistent flat structure and by the cutting angle direction of designing requirement wing to be installed with basal plane; It is short and narrow that little wing 1 is compared big wing 3.

2, drill bit as claimed in claim 1, its feature: the size according to stratum characteristic and bit size can increase or reduce wing quantity to satisfy the drilling well needs, as 4,8.