阅读说明：本技术 一种新型高效耐冲击金刚石复合片取心钻头 (Novel high-efficient shock-resistant diamond compact piece coring bit ) 是由 蔡家品 吴海霞 李春 沈立娜 贾美玲 刘协鲁 刘海龙 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种新型高效耐冲击金刚石复合片取心钻头,包括：钻头基体和金刚石复合片；所述钻头基体的冠部环形均匀布置多个刀翼；所述刀翼上设有多组切削元件,沿所述钻头基体的轴线方向布置；每组切削元件包括：依次排列齿形的金刚石复合片和圆形的金刚石复合片。该新型高效耐冲击金刚石复合片取心钻头,通过齿形与圆形金刚石复合片交错镶嵌于钻头基体的多个刀翼上,可减少金刚石复合片的磨损,提高钻进效率、增加使用寿命,可有效解决弹塑性地层取心效率低的难题。(The invention discloses a novel high-efficiency impact-resistant diamond compact coring bit, which comprises: a drill bit substrate and a diamond compact; a plurality of blades are uniformly arranged on the crown of the drill bit base body in an annular mode; the blade is provided with a plurality of groups of cutting elements which are arranged along the axial direction of the drill bit base body; each set of cutting elements includes: the toothed diamond compact and the circular diamond compact are sequentially arranged. This novel high-efficient shock-resistant diamond compact piece coring bit inlays on a plurality of blades of drill bit base member through profile of tooth and the crisscross of circular diamond compact piece, and reducible diamond compact piece's wearing and tearing improve and creep into efficiency, increase life, can effectively solve the difficult problem of elastoplasticity stratum coring inefficiency.)

1. The utility model provides a novel high-efficient shock-resistant diamond compact piece coring bit which characterized in that: comprises a drill bit matrix (1) and a diamond compact (2); a plurality of blades (3) are uniformly arranged in the crown of the drill bit base body (1) in an annular mode; a plurality of groups of cutting elements are arranged on the blade (3) and are arranged along the axial direction of the drill bit base body (1); each set of cutting elements includes: the toothed diamond compact (2) and the round diamond compact (2) are sequentially arranged.

2. The novel high-efficiency impact-resistant diamond compact coring bit as set forth in claim 1, wherein: tooth-shaped and round composite sheets are reserved on the blade (3) to replace sheets and composite sheet rear supports (4); the rear support (4) of the composite sheet is the same as the shape of the corresponding tooth-shaped or round composite sheet;

the toothed diamond composite sheet (2) is embedded in the tooth-shaped sheet replacing position of the blade (3) and is welded with the toothed composite sheet rear support (4);

the circular diamond compact (2) is inlaid in the circular sheet replacing position of the blade (3) and welded with the circular compact rear support (4).

3. The novel high-efficiency impact-resistant diamond compact coring bit as set forth in claim 1, wherein: the toothed diamond compact (2) is higher than the round diamond compact (2), and the height difference is 0.5-2 mm.

4. The novel high-efficiency impact-resistant diamond compact coring bit as set forth in claim 1, wherein: the blades (3) are long and externally tapered, and a water channel (5) is formed by a groove between any two adjacent blades (3).

5. The novel high-efficiency impact-resistant diamond compact coring bit as set forth in claim 1, wherein: one end of the outer side surface of the blade (3) far away from the diamond compact (2) is an outer gauge surface (6); the inner side surface of the blade (3) is an inner gauge surface (7);

and the outer gauge surface (6) and/or the inner gauge surface (7) are/is provided with gauge polycrystalline (8).

6. The novel high-efficiency impact-resistant diamond compact coring bit as set forth in claim 2, wherein: the toothed diamond compact (2) has the structural form that:

a first tooth form, a second tooth form, a third tooth form, a fourth tooth form, a fifth tooth form or a sixth tooth form.

7. The novel high-efficiency impact-resistant diamond compact coring bit according to claim 6, wherein: the structure form of the toothed composite sheet rear support (4) is the same as that of the corresponding toothed diamond composite sheet (2), and is a tooth form, a double tooth form, a triple tooth form, a quadruple tooth form, a quintet tooth form or a hexa tooth form.

8. The novel high efficiency impact resistant diamond compact coring bit of any one of claims 1-7, wherein: the diamond compact (2) is obliquely arranged, and an included angle between the diamond compact and the cutting surface of the upper blade (3) of the drill bit base body (1) is 5-30 degrees.

Technical Field

The invention belongs to the technical field of drilling operation of oil and gas fields and downhole tool bits, and particularly relates to a novel efficient impact-resistant diamond compact coring bit.

Background

At present, in the field of oil-gas exploration and development, when elastic-plastic stratum coring drilling is carried out, a diamond-impregnated coring bit is used, so that the diamond is not easy to be exposed, and the phenomena of extremely low drilling efficiency, even no drilling footage and drilling sticking are presented; the conventional hard alloy coring bit is used, so that the bit is quickly worn down and has short service life; by using the round diamond composite sheet coring bit, the composite sheet is less worn, but the footage is slow, and the efficiency is low; when the conventional toothed diamond composite sheet coring bit is used, the tooth tips of cutting teeth are often broken and damaged too early in the hard interlayer drilling process, so that the bit fails, and therefore, in the exploration and development process of unconventional oil gas, how to realize the coring drilling speed of the elastoplastic stratum and shorten the drilling period is always a technical difficulty of drilling.

Disclosure of Invention

The main object of the present invention is to provide a new high efficiency impact resistant diamond compact core bit that at least partially solves the above mentioned technical problems.

In order to achieve the purpose, the invention adopts the technical scheme that:

a novel high-efficiency impact-resistant diamond compact coring bit comprises a bit substrate and a diamond compact; a plurality of blades are uniformly arranged on the crown of the drill bit base body in an annular mode; the blade is provided with a plurality of groups of cutting elements which are arranged along the axial direction of the drill bit base body; each set of cutting elements includes: the toothed diamond compact and the circular diamond compact are sequentially arranged.

Furthermore, tooth-shaped and round composite sheets are reserved on the blades to replace sheets and support the composite sheets; the rear support of the composite sheet is the same as the shape of the replaced sheet of the corresponding tooth-shaped or round composite sheet;

the toothed diamond composite sheet is embedded at the tooth-shaped displacement position of the blade and is welded with the back support of the toothed composite sheet;

the circular diamond composite sheet is embedded at the circular displacement position of the blade and welded with the back support of the circular composite sheet.

Furthermore, the toothed diamond compact is higher than the round diamond compact, and the height difference is 0.5-2 mm.

Furthermore, the blades are long and externally tapered, and a water channel is formed by a groove between any two adjacent blades.

Furthermore, one end of the outer side surface of the blade, which is far away from the diamond compact, is an outer gauge surface; the inner side surface of the blade wing is an inner gauge surface;

and the outer gauge surface and/or the inner gauge surface are/is provided with gauge polycrystalline.

Further, the toothed diamond compact structure form is as follows:

a first tooth form, a second tooth form, a third tooth form, a fourth tooth form, a fifth tooth form or a sixth tooth form.

Furthermore, the rear support structure form of the toothed composite sheet is the same as the structure form of the corresponding toothed diamond composite sheet, and is a tooth form, a double tooth form, a triple tooth form, a quadruple tooth form, a quintet tooth form or a hexa tooth form.

Furthermore, the diamond compact piece is obliquely arranged, and an included angle between the diamond compact piece and the cutting surface of the blade on the drill bit substrate is 5-30 degrees.

Compared with the prior art, the invention has the following beneficial effects:

1. the tooth shapes and the circular diamond composite sheets are embedded on the plurality of blades of the drill bit matrix in a staggered mode, so that the abrasion of the diamond composite sheets can be reduced, the drilling efficiency is high, the service life is prolonged, and the problem of low elastic-plastic stratum coring efficiency can be effectively solved.

2. The back support of the composite sheet is consistent with the structure of the tooth-shaped or round composite sheet, namely: the shape of the composite sheet is consistent with that of a corresponding tooth shape or circular shape; the diamond composite sheet is welded with the back support of the composite sheet, so that the firmness and stability of the diamond composite sheet can be effectively improved.

3. Through setting up profile of tooth diamond compact and being higher than circular diamond compact for profile of tooth diamond compact cuts into the stratum fast, and circular diamond compact is followed closely and is cut the stratum thereafter, and circular diamond compact restriction profile of tooth diamond compact single cuts the degree of depth in order to protect the profile of tooth compound piece simultaneously, when guaranteeing not jumping the tooth, has high efficiency, long-life characteristics.

4. The blades are in a long external conical shape, so that the aggressiveness and the gauge protection strength of the drill bit can be effectively improved; a waterway formed between adjacent blades is used as a flushing fluid circulating flow passage, so that the functions of cooling the drill bit and removing chips are achieved.

5. The outer gauge surface is provided with a gauge polycrystalline which can play a role in protecting the diameter of the borehole; the inner gauge surface is provided with the gauge polycrystalline which can play a role in protecting the diameter of the core and improving the core sampling rate.

6. According to the concrete characteristics of elastic-plastic stratum rock, a corresponding number of tooth-shaped structures can be selected so as to achieve the purposes of aggressiveness and strong adaptability.

7. The diamond composite sheet is obliquely arranged, so that the diamond composite sheet has a good angle of cutting into the stratum, and the drilling rate is ensured.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of a novel high-efficiency impact-resistant diamond compact coring bit provided by the invention;

FIG. 2 is a schematic view of the bottom lip surface of a novel high-efficiency impact-resistant diamond compact coring bit provided by the invention;

in the figure: 1. a drill bit substrate; 2. a diamond compact; 3. a blade; 4. supporting the composite sheet at the back; 5. a waterway; 6. an outer gauge face; 7. an inner gauge surface; 8. and keeping the diameter of the polycrystalline.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in the figures 1-2, the novel efficient impact-resistant diamond compact coring bit comprises a bit substrate 1 and a diamond compact 2, wherein a plurality of blades are uniformly distributed in the crown of the bit substrate 1; the number of the blades can be 3-10, and the blades with corresponding number can be selected according to specific application environments. Each blade 3 is provided with a plurality of groups of cutting elements which are embedded with tooth-shaped and round diamond compacts 2 with high impact toughness and high wear resistance. The toothed diamond compacts and the round diamond compacts are sequentially arranged along the axial direction of the drill bit matrix and are arranged in a staggered mode.

In the embodiment, the tooth shapes and the circular diamond composite sheets are embedded on the plurality of blades of the drill bit substrate in a staggered mode, so that the abrasion of the diamond composite sheets can be reduced, the drilling efficiency is high, the service life is prolonged, and the problem of low elastic-plastic stratum coring efficiency can be effectively solved.

Specifically, as shown in fig. 1, the crown of the drill bit base body 1 is composed of a plurality of blades 3, a composite sheet rear support 4, a waterway 5, an outer gauge surface 6, an inner gauge surface 7 and a gauge polycrystalline 8, and each blade 3 is embedded with a diamond composite sheet 2 with high impact toughness and high wear resistance.

Wherein, tooth-shaped and round composite sheets are reserved on the blade 3 to replace sheets and composite sheets and then a back support 4 is reserved on the blade; the rear support 4 of the composite sheet is the same as the replaced shape of the corresponding tooth-shaped or round composite sheet, namely: the shape of the composite sheet is the same as that of the corresponding tooth shape or circular composite sheet.

The toothed diamond composite sheet 2 is embedded at the tooth-shaped sheet replacing position of the blade 3 and is firmly welded with the toothed composite sheet rear support 4 by a silver-copper brazing method; the round diamond composite sheet 2 is embedded at the round displacement position of the blade 3 and is welded firmly with the round composite sheet rear support 4 by a silver-copper brazing method; can effectively increase the firmness and stability of the diamond compact.

Further, the diamond compact with the tooth shape is higher than a circular diamond compact, namely: the exposed height of the toothed diamond compact is slightly higher than that of the circular diamond compact, for example, the height difference is 0.5-2 mm. So set up for profile of tooth diamond compact cuts into the stratum fast, and round diamond compact piece is cutting the stratum immediately afterwards, and round diamond compact piece restriction profile of tooth diamond compact piece single cuts the degree of depth in order to protect the profile of tooth compound piece simultaneously, when guaranteeing not to jump the tooth, has high efficiency, long-life characteristics.

Specifically, the plurality of blades 3 at the crown part of the drill bit base body 1 are designed to be long and externally tapered, so that the aggressiveness and the gauge protection strength of the drill bit can be effectively increased; the water channel 5 is formed by the groove between any two adjacent blades 3, and forms a flushing fluid circulation channel with the water channel in the drill bit, so that the functions of cooling the drill bit and removing chips are achieved. As shown in fig. 2, the number of the plurality of blades 3 is six, and the number of the blades of the drill bit can be adjusted according to formation characteristics and specifications of the drill bit.

Specifically, as shown in fig. 1, one end of the outer side surface of the blade 3 away from the diamond compact 2 is an outer gauge surface 6; the inner side surface of the blade 3 is an inner gauge surface 7; the outer gauge surface 6 is provided with gauge polycrystalline 8 which can play a role of protecting the diameter of the borehole; and meanwhile, the inner gauge surface 7 can also be provided with gauge protection glomerocryst 8 to play a role in protecting the diameter of the core and improving the core sampling rate. The outer gage surface 6 or the inner gage surface 7 may also be provided with a gage polycrystalline 8 alone. In the embodiments of the present disclosure, it is within the scope of the present disclosure that either the outer gauge surface or the inner gauge surface is provided with polycrystalline gauge alone or simultaneously.

Specifically, as shown in fig. 1-2, the tooth-shaped structure of the toothed diamond compact is 3 teeth, which may also be a one-tooth, two-tooth, three-tooth, four-tooth, five-tooth or six-tooth diamond compact, and the toothed diamond compact and the circular diamond compact are alternately embedded in each blade 3 at the crown of the drill bit substrate 1.

The rear support 4 of the toothed composite sheet is consistent with the toothed shape of the toothed diamond composite sheet 2, and the structure of the toothed composite sheet is a single toothed shape, a double toothed shape, a triple toothed shape, a quadruple toothed shape, a quintuplet toothed shape or a hexa toothed shape.

Specifically, the diamond composite sheet 2 is obliquely arranged and forms a certain back inclination angle, and the included angle between the diamond composite sheet and the cutting surface of the blade 3 on the drill bit substrate 1 is 5-30 degrees, so that the diamond composite sheet has a good angle of cutting into the stratum, and the drilling rate is ensured.

As shown in fig. 1-2, the working principle of the present invention is as follows: the invention adopts the design of a long external conical crown curve, and the diamond composite sheets are embedded on a plurality of blades of the drill bit matrix in a staggered manner through the tooth shapes and the circular diamond composite sheets, so that the diamond composite sheets are obliquely arranged in the drilling process, the diamond composite sheets have good angle of cutting into the stratum, and the drilling rate is ensured. The slightly high tooth-shaped diamond composite sheets which are inlaid on the blades can be quickly cut into the stratum, the round diamond composite sheets can be used for cutting the stratum immediately after the round diamond composite sheets, and meanwhile, the round diamond composite sheets can limit the single cutting depth of the tooth-shaped diamond composite sheets so as to protect the tooth-shaped composite sheets, so that the drilling efficiency is improved, and the service life is prolonged. The gauge polycrystalline on the outer gauge surface plays a role in protecting the diameter of the borehole. The gauge polycrystalline on the inner gauge surface plays a role in protecting the diameter of the core and improving the core sampling rate. A waterway formed between adjacent blades is used as a flushing fluid circulating flow passage, so that the functions of cooling the drill bit and removing chips are achieved.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.