CN114352204A

CN114352204A - Mixed drill bit

Info

Publication number: CN114352204A
Application number: CN202210090067.3A
Authority: CN
Inventors: 江诗贵; 杨东泽; ***; 吴革橙; 郑兵; 李宗昌; 叶中郎; 熊婷
Original assignee: Kingdream PLC; Sinopec Oilfield Equipment Corp
Current assignee: Sinopec Oilfield Equipment Corp
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-04-15

Abstract

The present application relates to a hybrid drill bit comprising a bit body, at least one fixed blade, and at least one bit leg; the fixed blade is connected to the end part of the drill bit body, and fixed cutting teeth are arranged on the fixed blade; the bit leg is connected to the end part of the bit body, a gear is arranged on the bit leg, and a tooth row is arranged on the gear; wherein the rows of teeth on one of the cones comprise steel teeth and the rows of teeth on one of the cones comprise inserts. The embodiment of the application provides a be provided with the steel tooth and inlay the tooth on the hybrid drill bit, when steel tooth contact shaft bottom, because its comparatively outstanding point shape structure, can effectively wedge hard plasticity stratum, play the effect in broken fine and close stratum in advance, and inlay the tooth bottom of impressing, play in the broken stratum in advance outside, still have stronger anti abrasiveness and limiting displacement, the wearability and the stability of hybrid drill bit have been promoted, the point shape structure of the fixed cutting tooth of reuse is scraped, can effectively improve the broken rock efficiency of hybrid drill bit.

Description

Mixed drill bit

Technical Field

The application relates to the technical field of petroleum and natural gas drilling, in particular to a hybrid drill bit.

Background

In the exploration and development of petroleum and natural gas resources in recent years, along with the continuous expansion of exploration blocks, more compact strata are often encountered, such as mudstone, gypsum rock, tuff and other strata with the characteristic of hard plasticity, when the strata are encountered, the drilling speed is often extremely high, and is as high as 100-.

In recent years, various special-shaped composite sheets are layered endlessly, certain breakthroughs are made for some tooth shapes, and roof teeth and conical teeth are proved in certain markets, but the special-shaped composite sheets are not suitable for the stratum with the hard plasticity characteristics and cannot play an effective scraping role in the stratum.

Disclosure of Invention

The embodiment of the application provides a hybrid drill bit to there is the problem of broken rock inefficiency when solving among the relevant art drill bit and using in the elastoplasticity stratum.

The embodiment of the application provides a hybrid drill bit, it includes:

a drill bit body;

the fixed blade is connected to the end part of the drill bit body and is provided with fixed cutting teeth;

the bit comprises a bit body, at least one bit leg and a bit row, wherein the bit leg is connected to the end part of the bit body, a gear is arranged on the bit leg, and the gear is provided with the tooth row;

wherein the rows of teeth on one of the cones comprise steel teeth and the rows of teeth on one of the cones comprise inserts.

In some embodiments, one of the cones is provided with both steel and inserts.

In some embodiments, all of the rows on the cone, one of the rows consisting of a plurality of the steel teeth and the other of the rows consisting of a plurality of the inserts;

or one of all the tooth rows on the gear wheel is formed by arranging the steel teeth and the inserts at intervals;

or, one of all the tooth rows on the roller cone is formed by scattering and arranging the steel teeth and the inserts.

In some embodiments, there are at least two of the legs, and in all of the legs, steel teeth are provided on the cone of one of the legs to form an all steel cone and inserts are provided on the cone of the other leg to form an all insert cone.

In some embodiments, the steel teeth are straight steel teeth, oblique steel teeth, arc top steel teeth or concave steel teeth.

In some embodiments, when the steel teeth are oblique steel teeth, the relative inclination angle of the oblique steel teeth and the axis of the roller cone on which the oblique steel teeth are arranged is 0-60 degrees.

In some embodiments, the surface of the steel tooth is provided with a wear-resistant welding layer.

In some embodiments, the wear resistant layer is tungsten carbide or diamond.

In some embodiments, the inserts are cemented carbide or diamond composite teeth;

and/or the insert adopts a conical tooth, a spoon-shaped tooth, a wedge-shaped tooth, a spherical tooth or a cylindrical tooth;

and/or the inserts are interference fit, brazed or bonded to the cone.

In some embodiments, the fixed cutter employs a cemented carbide tip, a diamond compact, or a compact made of cubic boron nitride polycrystalline material;

and/or the profile line shape of the hybrid drill bit is a line shape formed by tangent or connection of an arc line and a straight line;

and/or the height difference H between the tooth row on the gear and the fixed cutting teeth on the corresponding fixed blades on the radial projection of the bit body is-3-5 mm;

and/or the steel teeth on the roller cone are arranged in the inner row and/or the outer row of the roller cone.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a be provided with the steel tooth and inlay the tooth on the hybrid drill bit, when steel tooth contact shaft bottom, because its comparatively outstanding point shape structure, can effectively wedge hard plasticity stratum, play the effect in broken fine and close stratum in advance, and inlay the tooth bottom of impressing, play in the broken stratum in advance outside, still have stronger anti abrasiveness and limiting displacement, the wearability and the stability of hybrid drill bit have been promoted, the point shape structure of the fixed cutting tooth of reuse is scraped, can effectively improve the broken rock efficiency of hybrid drill bit.

The mixed arrangement structure of the steel inserts in the mixed drill bit enlarges the stratum adaptation range of the drill bit and has longer service life in complex strata.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a perspective view of a hybrid drill bit provided in accordance with an embodiment of the present application;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a radial projection of a hybrid bit set provided by an embodiment of the present application;

FIG. 4 is a perspective view of a hybrid drill bit provided in accordance with another embodiment of the present application;

FIG. 5 is a side view of a hybrid drill bit provided in accordance with yet another embodiment of the present application.

In the figure: 1. a drill bit body; 2. fixing the blade; 20. fixing the cutting teeth; 3. a bit leg; 4. a cone; 40. steel teeth; 41. inlaying teeth; 5. a chip groove; 6. a nozzle; 7. auxiliary blades.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 and 2, a hybrid drill bit provided by an embodiment of the present application includes a bit body 1, at least one fixed blade 2, and at least one bit leg 3, where the fixed blade 2 and the bit leg 3 are both connected to the same end of the bit body 1, the fixed blade 2 is provided with fixed cutting teeth 20, the bit leg 3 is provided with a cone 4, and the cone 4 is provided with a tooth row; wherein one row of teeth on one cone 4 comprises steel teeth 40 and one row of teeth on one cone 4 comprises inserts 41.

The embodiment of the application provides a be provided with steel tooth 40 and inlay tooth 41 on the hybrid drill bit, when the steel tooth 40 contact shaft bottom, because its sharp structure that is comparatively outstanding, can effectively wedge hard plasticity stratum, play the effect in the fine and close stratum of broken in advance, and inlay tooth 41 and impress the bottom, play outside the broken stratum in advance, still have stronger anti abrasiveness and limiting displacement, the wearability and the stability of hybrid drill bit have been promoted, the point structure of reuse fixed cutting tooth 20 is scraped, can effectively improve the broken rock efficiency of hybrid drill bit.

In the embodiment of the present application, the steel teeth 40 may be straight steel teeth, oblique steel teeth, arc top steel teeth or concave steel teeth. Each steel tooth 40 can independently select one from straight steel tooth, oblique steel tooth, curved top steel tooth and spill steel tooth, that is to say, all steel teeth 40 can select for use the same kind, also can all be different, also can partly the same, partly is different, select according to actual need can.

In the embodiment of the present application, when the steel teeth 40 are oblique steel teeth, the relative inclination angle between the oblique steel teeth and the axis of the cone 4 where the oblique steel teeth are located is 0-60 °. As for the specific inclination angle, the inclination angle can be selected according to actual needs.

In this application embodiment, the steel tooth 40 surface is equipped with the wear-resisting layer of applying, and tungsten carbide or diamond material can be chooseed for use to the wear-resisting layer of applying.

In the embodiment of the present application, the insert 41 is made of cemented carbide or diamond composite; each insert 41 may be independently selected from one of a cemented carbide tooth and a diamond composite tooth, that is, all the inserts 41 may be selected from the same kind, may be different from each other, may be partially the same, and may be partially different, and may be selected according to actual needs.

In the embodiment of the present application, the insert 41 is a cone, a spoon, a wedge, a spherical or a cylindrical tooth; each insert 41 can independently select a shape from a cone, a spoon, a wedge, a sphere and a cylinder, that is, all inserts 41 can be the same, or different, or some of the same, or some of different, and can be selected according to actual needs.

In the embodiment of the present application, inserts 41 and cone 4 may be connected by interference fit, brazing, or bonding. Each insert 41 may be selected independently from interference fit, brazing, and bonding, that is, all inserts 41 may be selected as the same type, may be different from each other, may be partially the same, and may be partially different, and may be selected according to actual needs.

In the embodiment of the present application, the fixed cutting teeth 20 are made of cemented carbide teeth, diamond compacts, or compacts made of cubic boron nitride polycrystalline materials; each fixed cutting tooth 20 may be independently selected from one of a cemented carbide tooth, a diamond compact, and a compact made of a cubic boron nitride polycrystalline material, that is, all the fixed cutting teeth 20 may be the same, may be different from each other, may be partially the same, and may be partially different, and may be selected according to actual needs.

Referring to fig. 3, in the embodiment of the present application, the profile line shape of the hybrid drill is a line shape formed by tangent or connection of an arc line and a straight line, and the center line of the hybrid drill is also illustrated.

In the embodiment of the application, the height difference H between the tooth row on the cone 4 and the fixed cutting teeth 20 on the corresponding fixed blade 2 on the radial projection of the bit body 1 is-3 mm to 5 mm.

For example, as shown in fig. 3, the height difference H between the radial projection of the steel teeth 40 on the cone 4 and the fixed cutting teeth 20 on the corresponding fixed blades 2 on the bit body 1 is 1mm (the steel teeth 40 contact the formation first), when the steel teeth 40 contact the bottom of the well, the steel teeth can be effectively wedged into the hard plastic formation due to the relatively protruding pointed structure, so as to perform the function of pre-crushing the compact formation, and the insert 41 is pressed into the bottom layer, so as to perform the function of pre-crushing the formation, and has relatively strong anti-abrasive performance and a limiting function, so that the wear resistance and stability of the hybrid bit are improved, and then the cutting is performed by the pointed structure of the fixed cutting teeth 20, so as to effectively improve the rock breaking efficiency of the hybrid bit.

The steel teeth 40 on the roller cone 4 may be selectively arranged on the inner row of the roller cone 4, or may be selectively arranged on the outer row, or in the case of a plurality of steel teeth 40, the steel teeth 40 may be arranged on both the inner row and the outer row.

In the present application, the number of the fixed blades 2 and the cone 4 may be set according to actual needs, generally speaking, the number of the fixed blades 2 and the cone 4 is 1 to 6, and generally, the number of the cone 4 does not exceed the number of the fixed blades 2.

For example, in fig. 1, the number of the fixed blades 2 is 4, and the number of the cones 4 is 2.

For another example, in fig. 4, the number of the fixed blades 2 is 2, and the number of the cones 4 is 2.

According to actual needs, an auxiliary blade 7 may be added, for example, in fig. 4, there are two auxiliary blades 7, the auxiliary blades 7 are staggered with the fixed blades 2, and two sides of the cone 4 are respectively an auxiliary blade 7 and a fixed blade 2.

Furthermore, there are chip flutes 5 between adjacent stationary blades 2, which chip flutes 5 are provided with nozzles 6, as is shown in fig. 2, for example.

Junk slots 5 and nozzles 6 may also be provided between the fixed blades 2 and the cone 4, such as shown in fig. 2.

The chip space 5 and the nozzle 6 may also be arranged between the auxiliary blade 7 and the fixed blade 2, as shown in fig. 4.

The application provides a hybrid drill bit, it includes steel tooth 40 and inlays tooth 41, when actual arrangement, has multiple mode, arranges according to actual need can

For example, in one embodiment, there is one cone 4 of all cones 4 on which both steel teeth 40 and inserts 41 are disposed.

Specifically, there may be the following arrangement:

one of the rows on cone 4 is comprised entirely of steel teeth 40 forming a steel row and the other row is comprised entirely of inserts 41 forming an insert row, such as shown in figure 1. The steel tooth rows and the insert tooth rows are selectively arranged in the inner row or the outer row of the roller cone 4 according to requirements.

Alternatively, one of all rows on the cone 4 is formed by steel teeth 40 and inserts 41 arranged at intervals.

Alternatively, one of all rows on the cone 4 is formed by interspersed steel teeth 40 and inserts 41, such as two inserts 41 between two adjacent steel teeth 40 in fig. 5.

Furthermore, one of the rows of teeth of cone 4 may be entirely comprised of a plurality of steel teeth 40, and the other row of teeth may be a mixed steel set row comprised of steel teeth 40 and sets 41.

Alternatively, one row of teeth may be entirely comprised of a plurality of inserts 41 and another row of teeth may be a mixed row of steel inserts 40 and inserts 41 in all rows of the cone 4.

The combination and arrangement can be carried out according to actual needs.

For another example, in one embodiment, at least two legs 3 are provided, and of all legs 3, all of the cones 4 of one leg 3 are provided with steel teeth 40 to form all steel cones and all of the cones 4 of the other leg 3 are provided with inserts 41 to form all insert cones.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hybrid drill bit, comprising:

a drill body (1);

at least one fixed blade (2) connected to an end of the bit body (1), and the fixed blade (2) is provided with fixed cutting teeth (20);

the bit comprises a bit body (1), at least one bit leg (3) and a bit row, wherein the bit leg (3) is connected to the end of the bit body (1), a cone (4) is installed on the bit leg (3), and the cone (4) is provided with the tooth row;

wherein, the tooth row on one cone (4) comprises steel teeth (40), and the tooth row on one cone (4) comprises inserts (41).

2. The hybrid drill bit of claim 1, wherein: of all the cones (4), one cone (4) is provided with both steel teeth (40) and inserts (41).

3. The hybrid drill bit of claim 2, wherein:

all rows of teeth on the roller cone (4), wherein one row of teeth consists of a plurality of steel teeth (40), and the other row of teeth consists of a plurality of inserts (41);

or one of all tooth rows on the roller cone (4) is formed by arranging the steel teeth (40) and the inserts (41) at intervals;

or one of all the tooth rows on the roller cone (4) is formed by the steel teeth (40) and the inserts (41) in a scattered mode.

4. The hybrid drill bit of claim 1, wherein: the cone comprises at least two bit legs (3), wherein steel teeth (40) are arranged on a cone (4) of one bit leg (3) in all the bit legs (3) to form an all-steel cone, and insert teeth (41) are arranged on the cone (4) of the other bit leg (3) to form an all-insert cone.

5. The hybrid drill bit of claim 1, wherein: the steel teeth (40) are straight steel teeth, oblique steel teeth, arc top steel teeth or concave steel teeth.

6. The hybrid drill bit of claim 5, wherein: when the steel teeth (40) adopt oblique steel teeth, the relative inclination angle of the oblique steel teeth and the axis of the cone (4) where the oblique steel teeth are located is 0-60 degrees.

7. The hybrid drill bit of claim 1, wherein: and the surface of the steel tooth (40) is provided with a wear-resistant welding layer.

8. The hybrid drill bit of claim 7, wherein: the wear-resistant welding layer is made of tungsten carbide or diamond.

9. The hybrid drill bit of claim 1, wherein:

the insert (41) adopts hard alloy teeth or diamond composite teeth;

and/or the insert (41) adopts a conical tooth, a spoon tooth, a wedge tooth, a spherical tooth or a cylindrical tooth;

and/or the inserts (41) are in interference fit, brazed or bonded with the cone (4).

10. The hybrid drill bit of claim 1, wherein:

the fixed cutting teeth (20) adopt hard alloy teeth, diamond compacts or compacts made of cubic boron nitride polycrystalline materials;

and/or the height difference H between the tooth row on the cone (4) and the fixed cutting teeth (20) on the corresponding fixed blades (2) on the radial projection of the bit body (1) is-3-5 mm;

and/or the steel teeth (40) on the roller cone (4) are arranged in the inner row and/or the outer row of the roller cone (4).