CN2533251Y

CN2533251Y - Composite double-functional drill bit

Info

Publication number: CN2533251Y
Application number: CN 02209943
Authority: CN
Inventors: 夏宪成; 徐延君; 于贵; 董继武; 贾永富
Original assignee: 夏宪成
Priority date: 2002-01-25
Filing date: 2002-01-25
Publication date: 2003-01-29
Anticipated expiration: 2012-01-25

Abstract

The utility model discloses a complex cover drilling drill essentially includes a cylindrical body and a gear body; wherein, the top end of the body is provided with a groove which is internally welded the gear body. The utility model is characterized in that: the ear body is fixed with an artificial diamond complex wafer; the inner wall of the body under the inner side of the gear body is welded with a relying board; the relying board is welded with a super hard cutting piece and the artificial diamond complex wafer; and the back side of the relying board is welded with a hard alloy welding strip. The utility model has a proper structure and design and has the functions of milling the rock well wall and concrete ring as well as the sleeve external packer and centralizer of the metal material.

Description

Combined type is got the cover drill bit

One, technical field: the utility model relates to a kind of oilfield well workover drill bit, and particularly a kind of combined type is got the cover drill bit.

Two, background technology: getting the cover drill bit is the indispensable instrument that the oil well deep-well is got the cover operation, should overlap in the operation and mill rock, cement sheath, cover mills external casing packer and the centralizer that metal material is made again, the existing at present cover drill bit of getting only has single performance, promptly or can only overlap and mill the rock borehole wall and cement sheath, or can only overlap and mill packer and centralizer, so deep-well is got the cover operation and needed under the secondary well operations just can finish, not only prolong man-hour, and increased cost of production.

Three, summary of the invention: the purpose of this utility model just is to provide a kind of can overlapping simultaneously to mill the rock borehole wall, cement sheath and external casing packer and centralizer, only need well operations down once get that the cover drill bit---combined type is got the cover drill bit.Technical solution of the present utility model is: the described cover drill bit of getting mainly includes body and the denticle that is the annulus column, upper end at body offers groove, and welding-on has denticle in groove, on denticle, be fixed with the compound disk of diamond, in denticle, be welded with support plate on the inner body wall of side-lower, be welded with superhard cutting blade and the compound disk of diamond on the support plate upper berth, the rear side built-up welding of support plate has carbide electrode; On the outer wall of denticle (8), be fixed with carbide alloy bar and diamond cylinder polycrystal composite, be fixed with diamond cylinder polycrystal composite in the side wall upper part of denticle.The utility model reasonable in design, having cover mills the rock borehole wall, cement sheath and cover and mills the external casing packer of metal material, the dual-use function of centralizer, therefore well operations once can be finished deep-well and get the cover operation down, thereby shortened man-hour greatly, reduced working strength of workers, greatly reduce the production run maintenance cost, reduced cost of production.

Four, description of drawings: Fig. 1 is that the main TV structure of the utility model embodiment partly cuts open schematic diagram;

Fig. 2 is the plan structure schematic diagram of the utility model embodiment.

Five, the specific embodiment: the described cover drill bit of getting mainly includes body 1 and the denticle 8 that is the annulus column, offer eight grooves in the upper end of body 1, and welding-on has denticle 8 in groove, on denticle 8, be fixed with the compound disk 4 of diamond, in denticle 8, be welded with band support plate 7 slightly on body 1 inwall of side-lower, on support plate 7 in an orderly manner, the dislocation shop is welded with superhard cutting blade 2 and the compound disk 4 of diamond, superhard cutting blade is used for cutting metal, the compound disk of diamond is used for rock cutting and cement sheath, the rear side built-up welding of support plate 7 has carbide electrode 3, plays to strengthen support plate intensity and part shear action.On the outer wall of denticle 8, be fixed with carbide alloy bar 5 and diamond cylinder polycrystal composite 6, prevent that denticle is by excessive wear; Side wall upper part at denticle 8 is fixed with diamond cylinder polycrystal composite 6.Support plate is uniform one-tenth bell mouth shape on inner body wall, and two kinds of cutting teeths on the support plate are mainly born the function of cutting cement sheath and external casing packer and centralizer, and the cutting blade on the denticle mainly plays the cutting rock of borehole.

Claims

1, a kind of combined type is got the cover drill bit, mainly include the body (1) and the denticle (8) that are the annulus column, upper end at body (1) offers groove, and welding-on has denticle (8) in groove, on denticle (8), be fixed with the compound disk of diamond (4), it is characterized in that being welded with support plate (7) on body (1) inwall of side-lower in denticle (8), be welded with superhard cutting blade (2) and the compound disk of diamond (4) on support plate (7) upper berth, the rear side built-up welding of support plate (7) has carbide electrode (3).

2, combined type as claimed in claim 1 is got the cover drill bit, it is characterized in that on the outer wall of denticle (8), being fixed with carbide alloy bar (5) and diamond cylinder polycrystal composite (6), be fixed with diamond cylinder polycrystal composite (6) in the side wall upper part of denticle (8).