CN211144380U - Cone bit of back cone build-up welding - Google Patents

Abstract

The utility model provides a cone bit of back cone build-up welding relates to a cone bit, including cone and cone back cone, be equipped with multirow main smear metal tooth on the outer conical surface of the casing of cone, main smear metal tooth be the insert or mill the tooth, contain first main smear metal tooth row, second main smear metal tooth row, third main smear metal tooth row and fourth main smear metal tooth row from the outer conical surface bottom of the casing of cone to the top at least in proper order, set up annular build-up welding groove on the surface of cone back cone, the build-up welding layer has in the build-up welding of annular build-up welding groove; the utility model discloses a at the whole annular build-up welding in gear wheel back of the body awl position for gear wheel back of the body awl position obtains whole full face formula coverage protection, greatly reduces gear wheel back of the body awl wearing and tearing, effectively reduces gear wheel back of the body awl and the regional gear wheel casing erosion of adjacent main smear metal tooth, reduces because of the too early inefficacy of smear metal structure that back awl erosion and then lead to, effectively prolongs drill bit cutting structure's live time, thereby improves gear wheel bit working life and working effect.

Description

Cone bit of back cone build-up welding

Technical Field

The utility model mainly relates to a roller bit technical field especially relates to a roller bit of back cone build-up welding.

Background

The roller bit is widely used as a tool for drilling rock strata, and is an indispensable important part in petroleum, stratum and various drilling industries, teeth on the roller bit are divided into outward-arranged main cutting teeth and gauge protection teeth on a back conical surface, and under high contact stress, the resultant relative sliding motion of the outward-arranged teeth can generate friction heat and cause abrasion and damage, so that the outward-arranged insert coating is cracked and peeled off, and carbide inserts are damaged due to the friction heat, so that the back conical inserts become main elements for controlling the well diameter.

At present, the mode of inlaying alloy teeth on the cone back of the cone is commonly used in the industry to reduce erosion and protect a cutting structure. The prior art roller cone bit shown in connection with FIG. 1 is: a plurality of rows of main cutting teeth are inlaid on a shell of the cone 2, a first main cutting tooth row 5, a second main cutting tooth row 4, a third main cutting tooth row 3 and a fourth main cutting tooth row 1 are inlaid in sequence from the bottom to the top of the shell of the cone 2, a plurality of annularly arranged holes 7 are formed in the surface of a cone back cone 6, and back cone teeth 8 are inlaid in the holes 7 in the surface of the cone back cone 6; conventional tungsten carbide back cone inserts are used to maintain full bit diameter, however these are generally referred to as flat-tipped back cone inserts, do not cut and remove the substrate, they simply hold the back cone more wear resistant than the abrasive particles in the formation, act as passive wear elements that use a crushing action to grind away the formation left over after the outer row of teeth has worked, cause additional contact stresses due to friction and thermal damage to the seal ring in more severe working conditions, and reduce the rate of penetration when a portion of the weight on bit is borne on the rounded conical back cone surface. The torque on the bit is increased by the worn back cone surface coming into contact with the formation.

However, under some very aggressive operating conditions, whether the cone back cone is lined with one row or the cone back cone is lined with two crossed rows of alloy teeth, erosion still occurs by protecting the voids between the relatively weak alloy teeth and eventually causes severe wear of the cone shell around the back cone or primary chip teeth resulting in tooth drop or breakage. Back cone wear can cause premature seal failure, reduced rate of penetration, cutting structure wear, dynamic instability, and other damage that may be caused to downhole components.

Patent document No. 200955355Y discloses a roller cone bit with a weld overlay back cone: a base hole is drilled on the cone back conical surface 2, and the back conical teeth 3 are built-up welded in the base hole of the cone back conical surface 2 by wear-resistant materials such as tungsten carbide or diamond; however, in the patent, the wear-resistant material is built up in the base hole on the back cone surface 2, and finally, a plurality of back cone teeth which are annularly arranged are still formed on the cone back cone surface 2, so that the integral protection cannot be formed at the cone back cone part.

Disclosure of Invention

The utility model provides a cone bit of back cone build-up welding is used for solving the unable integral protection that forms in the present cone bit back cone position that provides in the background art, leads to the wearing and tearing of the peripheral gear wheel casing of back cone tooth or main smear metal tooth serious and take place to fall the problem of tooth or disconnected tooth.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a cone bit of back cone build-up welding, includes cone and cone back cone, is equipped with multirow main smear metal tooth on the outer conical surface of casing of cone, main smear metal tooth for inlaying the tooth or milling the tooth, multirow main smear metal tooth is arranged from the outer conical surface bottom to the top of casing of cone in proper order, offers annular build-up welding groove on the surface of cone back cone annular build-up welding inslot build-up welding has the build-up welding layer.

According to the cone bit with the back cone built-up welding structure, the multiple rows of main cutting teeth on the outer conical surface of the shell of the cone at least comprise a first main cutting tooth row, a second main cutting tooth row, a third main cutting tooth row and a fourth main cutting tooth row.

The cone bit with the back cone subjected to surfacing welding is characterized in that the annular surfacing welding groove surrounds the whole outer surface of the cone back cone.

According to the cone bit with the back cone built-up welding, the width of the annular built-up welding groove is 3/5-4/5 of the width of the cone back cone.

The cone bit with the back cone overlaying welding structure is characterized in that the distance between the upper edge of the annular overlaying welding groove and the upper edge of the outer surface of the cone back cone is 1-1.5 mm, and the distance between the lower edge of the annular overlaying welding groove and the lower edge of the outer surface of the cone back cone is 1-1.5 mm.

The cone bit of back cone build-up welding, the cross-section of annular build-up welding groove is triangle-shaped.

The cone bit with the back cone subjected to surfacing welding is characterized in that the surfacing layer is 1-1.5 mm higher than the surface of the cone back cone.

The cone bit with the back cone built-up welding structure is characterized in that the built-up welding layer is a tungsten carbide strengthening layer.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a whole annular build-up welding in gear back cone position for gear back cone position obtains whole full face formula coverage protection, and the build-up welding layer on the back cone face can greatly reduce gear back cone wearing and tearing, overcomes the problem that current gear back cone sets up a finite back cone tooth according to a determining deviation and leads to the weak position in space between the back cone tooth on the gear back cone face and easily receives the erosion; meanwhile, the utility model can avoid the situation that the cone back cone surface is punched to be embedded with the back cone teeth in the traditional technology by the integral overlaying welding on the outer surface of the cone back cone, thereby improving the strength and the rigidity of the cone back cone part; the utility model discloses effectively reduce the regional gear wheel casing erosion of gear wheel back cone and adjacent main smear metal tooth, reduce because of the too early inefficacy of smear metal structure that back cone erosion and then lead to, effectively prolong drill bit cutting structure's live time to improve gear wheel bit working life and working effect.

Drawings

FIG. 1 is a schematic representation of a prior art roller cone drill bit configuration;

FIG. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is an enlargement of section A of FIG. 2;

in the figure: 1-fourth main cutting tooth row, 2-gear wheel, 3-third main cutting tooth row, 4-second main cutting tooth row, 5-first main cutting tooth row, 6-gear wheel back cone, 7-hole, 8-back cone tooth, 9-surfacing layer and 10-annular surfacing groove.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings, in which several embodiments of the present invention are shown, but the present invention can be implemented in different forms, and is not limited to the embodiments described in the text, but rather, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the use of the term knowledge in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In an embodiment, referring to fig. 2, a cone bit with a back cone built-up welding comprises a cone 2 and a cone back cone 6, wherein a plurality of rows of main cutting teeth are arranged on an outer conical surface of a shell of the cone 2, the main cutting teeth are inserts or milling teeth, the plurality of rows of main cutting teeth are sequentially arranged from the bottom to the top of the outer conical surface of the shell of the cone 2, an annular built-up welding groove 10 is formed in the surface of the cone back cone 6, and a built-up welding layer 9 is built-up in the annular built-up welding groove 10.

In an embodiment, referring to fig. 2, the plurality of rows of main cutting teeth on the outer conical surface of the shell of cone 2 at least include a first main cutting tooth row 5, a second main cutting tooth row 4, a third main cutting tooth row 3 and a fourth main cutting tooth row 1.

In an embodiment, referring to fig. 2 and 3, the annular overlaying groove 10 surrounds the entire outer surface of the cone back 6, and the cone back is integrally covered and protected in a full-face manner by integrally overlaying the cone back on the cone back, so that erosion of the cone back and a cone shell in an adjacent main chip tooth area is effectively reduced, and premature failure of a chip structure caused by erosion of the cone back is reduced.

In the embodiment, referring to fig. 2 and 3, the width of the annular overlaying welding groove 10 is 3/5-4/5 of the width of the cone back cone 6; the upper edge of the annular overlaying groove 10 is 1-1.5 mm away from the upper edge of the outer surface of the cone back 6, and the lower edge of the annular overlaying groove 10 is 1-1.5 mm away from the lower edge of the outer surface of the cone back 6; by setting the width of the annular overlaying groove 10, it can be avoided that the overlaying layer 9 is easily worn off in the operation process due to the annular overlaying groove 10 being too narrow, and the fastening force of the main cutting teeth is affected by the annular overlaying groove 10 being too wide.

In an embodiment, referring to fig. 2, the cross section of the annular overlaying groove 10 is triangular, which not only facilitates processing and operation, but also takes into account the fastening force of the first main chip tooth row 5 and avoids tooth breakage or tooth falling; the surfacing layer 9 is 1 mm-1.5 mm higher than the surface of the cone back cone 6, and the surfacing layer 9 can be prevented from being easily ground off due to the fact that the surfacing layer 9 is too thin in the operation process by setting the thickness of the surfacing layer 9.

In the cone bit with the back cone subjected to surfacing welding, the surfacing layer 9 is a tungsten carbide strengthening layer, so that the abrasion of a shell at the cone back cone part is effectively reduced, and the service life and the working effect of the cone bit are improved.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents, and thus the embodiments of the invention are intended only as illustrative examples of the invention and no limitation of the invention is intended whatsoever to be construed by the embodiments of the invention.

Claims (8)

1. A cone bit of back cone build-up welding, includes cone (2) and cone back cone (6), characterized by: be equipped with multirow main smear metal tooth on the outer conical surface of casing of cone (2), main smear metal tooth be for inlaying the tooth or milling teeth, multirow main smear metal tooth is arranged from the outer conical surface bottom of casing to the top of cone (2) in proper order, offers annular surfacing welding groove (10) on the surface of cone back of the body cone (6) annular surfacing welding groove (10) in surfacing have surfacing layer (9).

2. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the multiple rows of main cutting teeth on the outer conical surface of the shell of the cone (2) at least comprise a first main cutting tooth row (5), a second main cutting tooth row (4), a third main cutting tooth row (3) and a fourth main cutting tooth row (1).

3. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the annular overlaying groove (10) surrounds the whole outer surface of the cone back cone (6).

4. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the width of the annular overlaying groove (10) is 3/5-4/5 of the width of the cone back cone (6).

5. A back-cone hardfaced roller cone drill bit according to claim 3, further characterized by: the upper edge of the annular overlaying groove (10) is 1-1.5 mm away from the upper edge of the outer surface of the cone back cone (6), and the lower edge of the annular overlaying groove (10) is 1-1.5 mm away from the lower edge of the outer surface of the cone back cone (6).

6. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the cross section of the annular overlaying groove (10) is triangular.

7. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the surfacing layer (9) is 1-1.5 mm higher than the surface of the cone back cone (6).

8. A back-cone hardfaced roller cone drill bit according to claim 1, further characterized by: the surfacing layer (9) is a tungsten carbide strengthening layer.

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