CN202645438U

CN202645438U - PDC (Polycrystalline Diamond Compact) drill bit with high build-up rate

Info

Publication number: CN202645438U
Application number: CN 201220315721
Authority: CN
Inventors: 闭磊; 赵同坚; 饶岩岩; 貟延凤
Original assignee: CHENGDU BEST DIAMOND BIT CO LTD
Current assignee: CHENGDU BEST DIAMOND BIT CO LTD
Priority date: 2012-07-02
Filing date: 2012-07-02
Publication date: 2013-01-02
Anticipated expiration: 2022-07-02

Abstract

The utility model discloses a PDC (Polycrystalline Diamond Compact) drill bit with high build-up rate. The PDC drill bit with high build-up rate comprises a body, a joint, a blade, a nozzle, multiple gauge protection blocks and cutting teeth, wherein the multiple gauge protection blocks are uniformly distributed on the circumferential surface of the body; one end adjacent to the cutting teeth is taken as a front end, and one end adjacent to the joint is taken as a rear end; the external surface of each gauge protection block is composed of a front surface and a rear surface, each front surface is a cylindrical surface, and each rear surface is a conical surface; and the distance between the rear end of each rear surface and the axis of the PDC drill bit is less than that between the front end of each rear surface and the axis of the PDC drill bit. When the PDC drill bit is in use, the lateral contact area of the PDC drill bit and a well wall is smaller than that of a traditional drill bit and the well wall, so that under the condition of the same lateral driving force of a tool, the lateral cutting teeth of the PDC drill bit have greater lateral cutting capability, and thus more lateral well wall rocks can be cut.

Description

A kind of high build angle rate PDC drill bit

Technical field

The utility model relates to a kind of PDC drill bit for the oil/gas exploitation, relates in particular to a kind of high build angle rate PDC drill bit.

Background technology

Along with the continuous progress of oil development exploration engineering, increasing advanced tools is applied in the petroleum drilling operation at present.PowerDrive Xceed is a kind of fully directional type well system of rotation with inner guiding mechanism wherein, the PDC drill bit is the abbreviation of diamond compact bit, be oil drilling industry a kind of drilling tool commonly used, it can help drilling well to realize great dog-leg degree.But when offshore oil drilling faces more complicated and during casing programme that curvature is higher, light relies on the ability of instrument not exclusively can satisfy the requirement of drillng operation.If what particularly instrument cooperated is traditional conventional PDC drill bit or traditional directional drilling bit, the optimum performance of instrument will can not get performance so.At present in Chinese Sea oil exploitation process, can often run into such technical barrier: formation drillability is fine, the rate of penetration ROP of PDC drill bit in the stratum is very fast, but because need, casing programme design very complicatedly and also curvature well large, even use advanced person's rotary steering system also difficulty meets the demands, this just needs the PDC drill bit of special adaptations to cooperate with instrument, could realize larger drilling well dog-leg degree and PDC drill bit deflecting ability.

Summary of the invention

The purpose of this utility model provides a kind of high build angle rate PDC drill bit with regard to being in order to address the above problem.

The utility model is achieved through the following technical solutions above-mentioned purpose:

The utility model comprises body, joint, wing, nozzle, gauge piece and cutting teeth, and described gauge piece comprises a plurality of, is uniformly distributed on the periphery of described body; If the end near described cutting teeth is front end, end near described joint is the rear end, the external surface of described gauge piece is made of front surface and rear surface, described front surface is the face of cylinder, described rear surface is taper seat, and the distance between the rear end of described rear surface and the described PDC drill bit axle center is less than the front end of described rear surface and the distance between the described PDC drill bit axle center.

Because the rear surface of gauge piece is taper seat, so when the utility model cooperates PowerDrive Xceed tool work, more side cutting masterpiece is used on the outside cutting teeth of drill bit, rather than act on the gauge piece, so that the utlity model has stronger deflecting ability, reach larger drilling well dog-leg degree.

After the utility model work a period of time, the front surface section of gauge piece can produce certain wearing and tearing, the diameter of this section gauge piece is reduced, be lower than the drill bit nominal outer diameter, more side cutting masterpiece is used on the cutting teeth in the outside, and lateral cutting ability of the present utility model can further strengthen.And when the front surface section of gauge piece was was further worn and torn, the rear surface of gauge piece can more participation work.Can guarantee that so whole gauge piece is unlikely to wearing and tearing too serious.

As preferably, the ratio between the axial length of described front surface and the described gauge piece axial overall length is less than 1/2nd; The tapering of described rear surface is less than 15 °.

Further, if described PDC drill bit minimum point is inner cutting teeth to the cutting teeth within the described PDC drill bit heart section scope, if described PDC drill bit minimum point is outside cutting teeth to the cutting teeth within the described PDC outside diameter scope, the relief angle of described inner cutting teeth is greater than the relief angle of described outside cutting teeth.

The beneficial effects of the utility model are:

During use, the contacted area of the utility model side direction and the borehole wall is little than conventional drill, thus in same tool side under driving force, the cutting teeth of the utility model side direction has larger lateral cutting ability, thereby can cut more side direction rock of borehole; The relief angle of inner cutting teeth has limited the cutting power of the utility model at axial direction greater than the structure of the relief angle of outside cutting teeth, so that the utility model strengthens in the cutting power of lateral, thereby improves deflecting ability of the present utility model.

Description of drawings

Fig. 1 is perspective view of the present utility model;

Fig. 2 is the front view after the utility model removes joint.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As depicted in figs. 1 and 2, the utility model comprises body 3, joint 1, wing 5, nozzle 4, gauge piece 2 and cutting teeth 6, and gauge piece 2 comprises a plurality of, is uniformly distributed on the periphery of body 3; If the end near cutting teeth 6 is front end, end near joint 1 is the rear end, the external surface of gauge piece 2 is made of front surface 8 and rear surface 7, front surface 8 is the face of cylinder, rear surface 7 is taper seat, and the distance between the rear end of rear surface 7 and the utility model axle center is less than the front end of rear surface 7 and the distance between the utility model axle center.

As shown in Figure 2, the ratio between the axial overall length w2 of the axial length w1 of front surface 8 and gauge piece 2 is less than 1/2nd; The tapering α of rear surface 7 is less than 15 °.

As depicted in figs. 1 and 2, if the utility model minimum point is inner cutting teeth to the cutting teeth 6 within the utility model heart section scope, if the utility model minimum point is outside cutting teeth to the cutting teeth 6 within the utility model external diameter scope, the relief angle of inner cutting teeth is greater than the relief angle of outside cutting teeth.

As depicted in figs. 1 and 2, during use, be connected work with joint 1 with PowerDrive Xceed instrument, more side cutting power effect is externally on the cutting teeth, rather than act on the gauge piece 2, so that the utlity model has stronger deflecting ability, reach larger drilling well dog-leg degree.After the utility model work a period of time, the front surface 8 place leading portions of gauge piece 2 can produce certain wearing and tearing, the diameter of this section gauge piece 2 is reduced, be lower than the drill bit nominal outer diameter, more side cutting masterpiece is used on the cutting teeth 6 in the outside, and lateral cutting ability of the present utility model can further strengthen.And when the front surface 8 place leading portions of gauge piece 2 further wore and tore, the rear surface 7 of gauge piece 2 can more participation work.Can guarantee that so whole gauge piece 2 is unlikely to wearing and tearing too serious.

Claims

1. one kind high build angle rate PDC drill bit comprises body, joint, wing, nozzle, gauge piece and cutting teeth, and described gauge piece comprises a plurality of, is uniformly distributed on the periphery of described body; It is characterized in that: an end of establishing near described cutting teeth is front end, end near described joint is the rear end, the external surface of described gauge piece is made of front surface and rear surface, described front surface is the face of cylinder, described rear surface is taper seat, and the distance between the rear end of described rear surface and the described PDC drill bit axle center is less than the front end of described rear surface and the distance between the described PDC drill bit axle center.

2. high build angle rate PDC drill bit according to claim 1, it is characterized in that: the ratio between the axial length of described front surface and the described gauge piece axial overall length is less than 1/2nd.

3. high build angle rate PDC drill bit according to claim 1, it is characterized in that: the tapering of described rear surface is less than 15 °.

4. high build angle rate PDC drill bit according to claim 1, it is characterized in that: establishing described PDC drill bit minimum point is inner cutting teeth to the cutting teeth within the described PDC drill bit heart section scope, if described PDC drill bit minimum point is outside cutting teeth to the cutting teeth within the described PDC outside diameter scope, the relief angle of described inner cutting teeth is greater than the relief angle of described outside cutting teeth.