CN201891385U

CN201891385U - 8.5'' six-blade and long-gauge carcase PDC (Polycrystalline Diamond Compact) drill bit

Info

Publication number: CN201891385U
Application number: CN 201020670147
Authority: CN
Inventors: 谢玉洪; 张勇; 林金成; 王振峰; 黄凯文; 张红生; 张超; 陈俊勇; 刘杰; 李旭东; 杨英详; 温伟明; 唐海
Original assignee: SHEENSTONE (SHENZHEN) OIL TOOLS CO Ltd; China National Offshore Oil Corp CNOOC; CNOOC China Ltd Zhanjiang Branch
Current assignee: SHEENSTONE (SHENZHEN) OIL TOOLS CO Ltd; China National Offshore Oil Corp CNOOC; CNOOC China Ltd Zhanjiang Branch
Priority date: 2010-12-15
Filing date: 2010-12-15
Publication date: 2011-07-06
Anticipated expiration: 2020-12-15

Abstract

The utility model discloses a 8.5'' six-blade and long-gauge carcase PDC (Polycrystalline Diamond Compact) drill bit, which consists of a drill bit body, blades, spray nozzles, teeth and gauges, wherein the outside diameter of the drill bit is 8.5''; the drill bit body is provided with long blades and short blades; the long blades are provided with main cutting teeth and rear row teeth; the short blades are provided with main cutting teeth and rear row teeth; the spray nozzles are respectively arranged at the front ends of the long blades and the short blades; the blades use 6'' lengthened full-spiral gauges and are distributed around the center of a crown body of the drill bit body at the distribution angles of 0 degree, 60 degrees, 125 degrees, 180 degrees, 235 degrees and 295 degrees; the diameter of the main cutting teeth is 16mm; the diameter of the rear row teeth is 13mm; the main cutting teeth and the rear row teeth are arranged from near to far according to the distance away from the center of the drill bit body; the back rake angles of the teeth are progressively increased to 24.9 degrees at a gradient of 0.3 degree from 15 degrees; the distribution number of the main cutting teeth on the blades are sequentially 7, 4, 7, 4, 7 and 4; and four rear row teeth are distributed on each blade. According to the 8.5'' six-blade and long-gauge carcase PDC drill bit, the distribution angle of the blades of the drill bit, the gauge length, the distribution position and the back rake angles of the teeth on the blades are adjusted, thereby the service life of the whole drill bit is prolonged; and in addition, the well drilling speed is improved.

Description

A kind of 8.5 " the long footpath tyre case PDC drill of protecting of six wings

Technical field

The utility model relates to a kind of 8.5, and " the long guarantor of six wings is tyre case PDC drill directly.

Background technology

Part stratum, basin, the North Sea, THE WESTERN SOUTH CHINA SEA marine site (Eogene drift sand port group, long stream group stratum) is big to the wearing and tearing of drill bit, has had a strong impact on exploration and development speed.The PDC drill bit of prior art, the distribution of tooth and setting and be not suitable for this place layer on the distribution angle of wing and the wing, service behaviour is poor, the PDC composite sheet is easy to generate cracked and over worn phenomenon, cause drill bit to damage in advance, and rate of penetration is lower, influences drillng operation.

Summary of the invention

The purpose of this utility model is, according to basin, North Sea Eogene bad ground lithological characteristic, design utility model PDC drill bit with strong points, the distribution that overcomes tooth on the distribution angle of existing drill bit wing and the wing with irrational deficiency is set, cooperate the improvement of aspects such as drilling parameter and mud system, improve rate of penetration, prolong the application life of drill bit.

The utility model is by bit body, the rimmer knife wing, the short sword wing, nozzle, main cutting tooth, back toothrow, 6 " the full spiral that extends is protected directly and formed, and outside dimension is 8.5 ".On bit body, be provided with 3 rimmer knife wings and 3 short sword wings, toothrow after 7 main cutting teeth and 4 respectively are installed on the rimmer knife wing, toothrow after 4 main cutting teeth and 4 respectively are installed on the short sword wing, front end at the rimmer knife wing and the short sword wing all is equipped with nozzle, wing adopts 6 " the full spiral that extends is protected the footpath; wound drill bit body bizet central distribution, its distribution angle are respectively 0 °, 60 °, 125 °, 180 °, 235 °, 295 °; The main cutting tooth is a diameter 16mm tooth, and back toothrow is a diameter 13mm tooth, and by arranging from the near to the remote with bit body centre distance, the back rake angle of tooth is incremented to 24.9 ° since 15 ° with 0.3 ° of ladder; 33 main cutting tooth diameters are 16mm, toothrow after the distribution number on wing is followed successively by 7,4,7,4,7,4,24, and diameter is 13mm, every wing distributes 4.

The beneficial effects of the utility model are, the distribution and the setting of tooth on the distribution angle of having adjusted wing on the basis of existing drill bit structure and wing, thus prolonged application life of whole drill bit, and improved bit speed.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model structure vertical view.

The specific embodiment

The PDC drill bit structure comprises 3,6 nozzles 4 of 2,3 short sword wings of 1,3 rimmer knife wings of bit body referring to Fig. 1, and toothrow 5 behind 6,24 in 33 main cutting teeth.Wing is fixed on the bit body 1, and tooth is fixedly mounted on the wing, and nozzle 4 is installed in the wing front end.

Wing wound drill bit body 1 bizet central distribution comprises 3

rimmer knife wings

2 and 3 short sword wings 3, adopts 6, and " the full spiral that extends is protected footpath 7, and wound drill bit body 1 bizet central distribution, its distribution angle are respectively 0 °, 60 °, 125 °, 180 °, 235 °, 295 °.

The back rake angle of each tooth by arranging from the near to the remote with the distance at bit body 1 center, is incremented to 24.9 ° since 15 ° with 0.3 ° of interval ladder for differing, and main cutting tooth 6 is a diameter 16mm tooth, and back toothrow 5 is a diameter 13mm tooth.

Claims

1. one kind 8.5 " the long footpath tyre case PDC drill of protecting of six wings; by bit body; the rimmer knife wing; the short sword wing; nozzle; the main cutting tooth, back toothrow, 6 " the full spiral of lengthening is protected the footpath composition; it is characterized in that external diameter is 8.5 ", bit body (1) is provided with 3 rimmer knife wings (2) and 3 short sword wings (3), toothrow (5) after 7 main cutting teeth (6) and 4 respectively are installed on the rimmer knife wing (2), toothrow (5) after 4 main cutting teeth (6) and 4 respectively are installed on the short sword wing (3), front end at the rimmer knife wing (2) and the short sword wing (3) all is equipped with nozzle (4), wing adopts 6, and " the full spiral that extends is protected footpath (7); wound drill bit body (1) bizet central distribution, and its distribution angle is respectively 0 °; 60 °; 125 °; 180 °; 235 °, 295 °; Main cutting tooth (6) diameter is 16mm, back toothrow (5) diameter is 13mm, by arranging from the near to the remote with bit body (1) centre distance, the back rake angle of tooth is incremented to 24.9 ° since 15 ° with 0.3 ° of ladder, the distribution number of 33 main cutting teeth (6) on wing is followed successively by 7,4,7,4,7,4, toothrow after 24 (5), every wing distributes 4.