CN211397463U

CN211397463U - Diamond bit with sinking surface on blade

Info

Publication number: CN211397463U
Application number: CN201921777536.9U
Authority: CN
Inventors: 杨迎新; 宋东东; 任海涛; 张春亮; 包泽军; 杨燕
Original assignee: Chengdu Weiyi Petroleum Technology Co ltd; Southwest Petroleum University
Current assignee: Chengdu Weiyi Petroleum Technology Co ltd; Southwest Petroleum University
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-09-01
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses a diamond bit that has a face that sinks on wing belongs to oil and gas probing technical field, including the drill bit body, extend from the drill bit body or fix a plurality of wing on the drill bit body, be provided with the cutting tooth on the wing, be the runner duct between the adjacent wing, have a wing at least on the drill bit, the wing cloth tooth in at least partial cutting tooth the place ahead forms a face that sinks towards the drill bit body shrink on this wing be provided with the water hole on the face that sinks. The utility model discloses the water hole jet distance of drill bit is obviously shorter than conventional diamond bit, and is bigger via the liquid stream jet velocity of cutting teeth working face, washing shaft bottom that can be timely to can effectively carry out the migration to the detritus, be applicable to soft, hard, soft or hard stratum in turn, spout simultaneously reducing of distance, the liquid stream that makes the water hole on sinking the face by the wing of a knife and erupt restraints the energy consumption little, and is better to the supplementary destruction effect of shaft bottom rock. In addition, the sinking surface is arranged on the blade, so that the chip containing space of the whole drill bit is increased, and the chip removing capability under the condition of adapting to rapid drilling is realized.

Description

Diamond bit with sinking surface on blade

Technical Field

The invention belongs to the technical field of drilling of petroleum and natural gas, mine engineering, geothermal wells, construction foundation engineering construction, geology, hydrology and the like, and particularly relates to a diamond drill bit with a sinking surface on a blade.

Background

Drill bits are rock breaking tools used in drilling operations to break rock and form wellbores. Besides the cutting structure, the hydraulic structure on the drill bit plays an important role in the rock breaking efficiency and the service life of the drill bit, namely, cooling the cutting teeth, cleaning the well bottom, transporting rock debris, assisting in rock breaking and the like. At present, the hydraulic structure on the drill bit is designed by arranging nozzles or water holes at different positions on a drill bit body, and drilling fluid or cooling medium in an inner flow passage is sprayed out through the nozzles or the water holes so as to achieve the purposes of cleaning and cooling cutting elements.

In modern fast drilling technology, the drill bit is required to have excellent rock breaking and cutting structures and good hydraulic performances of well bottom cleaning, rock debris migration, cutting tooth cooling and cleaning and the like. The hydraulic structure of the conventional drill bit can be designed only aiming at specific stratum, and firstly, the design of the corresponding drill bit is carried out aiming at soft stratum to prevent the drill bit from being mud-filled due to excessive rock debris in the drilling of the soft stratum; secondly, the design of a corresponding drill bit is carried out aiming at the hard stratum to prevent the cutting teeth from generating larger heat due to overlarge friction in the drilling process of the hard stratum, so that the cutting teeth cannot be cooled in time to generate the thermal wear phenomenon. The drill bit can only drill for soft stratum or hard stratum and other single stratum, but cannot drill for both soft and hard stratum.

When the distance between the nozzle and the cutting tooth is large, namely the spraying distance is large, the hydraulic on-way energy loss is large, and rock debris cannot be cleaned and moved in time when drilling into a soft stratum, so that the rock debris is accumulated continuously, a bit mud pocket is generated, and finally the bit fails; when drilling into hard stratum, the cutting teeth can not be cooled sufficiently in time due to friction, and the cutting teeth can be worn thermally. Particularly, in recent years, the rapid development of geothermal drilling is that the working temperature of the drill bit is as high as 150 degrees or higher, the probability of thermal abrasion of cutting teeth is greatly improved, and the service life and the drilling performance of the drill bit can be obviously reduced.

With the continuous development of well drilling, not only soft strata or hard strata, but also various different strata and alternate soft and hard strata are encountered in actual well drilling. The conventional drill bit cannot simultaneously meet the requirements of preventing mud pockets in a soft stratum and avoiding the thermal abrasion phenomenon of cutting teeth in a hard stratum.

Disclosure of Invention

The invention aims to: the defects of the prior art are overcome, the diamond drill bit with the sinking surface on the blade is provided, the effects of enhancing the cooling capacity of the cutting teeth and the rock debris migration capacity can be achieved, and the diamond drill bit has the drilling capacity in different stratums.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a diamond bit that has sinking face on wing, includes the drill bit body, extends from the drill bit body or fixes a plurality of wing on the drill bit body, be provided with the cutting tooth on the wing, be runner groove, its characterized in that between the adjacent wing: the drill bit is provided with at least one blade, blade cloth teeth in front of at least part of cutting teeth on the blade are contracted towards the drill bit body to form a sinking surface, and the sinking surface is provided with a water hole.

Sinking the surface: when the tooth surface of the blade cloth at the front end of the cutting part of the cutting tooth sinks (or shrinks towards the direction of the bit body) to the upper part of the bottom surface of the flow channel, the working surface of the sunk blade body is a sinking surface, and the sinking surface can be a plane or a curved surface.

Typically, a blade-cloth flank is the surface of the blade on which the cutting teeth are disposed, opposite the bottom surface of the well, as indicated by reference number 201 in FIG. 1.

In the above scheme, set up the face that sinks on the blade, increased the bits space of holding of whole drill bit, when the detritus volume is big, can avoid piling up of detritus to cause the wearing and tearing of blade, the liquid stream jet distance can be reduced to the water hole that sets up on the face that sinks, improves the utilization ratio of water conservancy energy, can be timely, abundant cool off the cleaning to the cutting tooth, weakens the cutting tooth thermal wear degree, and then improves the working life and the well drilling efficiency of drill bit. The outlet shape of the water hole on the sinking surface comprises a circle, a semicircle, an ellipse, a rectangle, a rhombus or a combination of the circle, the semicircle, the ellipse and the rectangle.

Alternatively, the profile of the sinking surface in the axial plane of the bit may be the same as the profile of the working profile of the bit.

In the above scheme, the working contour line of the drill is that when the drill is not fed (axially), the drill rotates around its own axis for one circle, the intersecting lines of all cutting tooth edge profiles and the axial surface form a radial tooth distribution diagram (or a covering tooth distribution diagram, which is a concept well known to researchers in the field) of the drill, and the outer envelope lines of the intersecting lines are the working contour line of the drill. The contour line of the sinking surface formed in the axial plane of the drill bit is the same or approximately the same as the trend of the working contour line of the drill bit, so that the distances from the water holes in the sinking surface to the cutting teeth of the blades are the same or approximately the same, and the cutting teeth at different positions on the blades can be cooled uniformly.

Alternatively, at least one water hole arranged on the sinking surface corresponds to the cutting teeth.

In the above scheme, the water holes correspond to the cutting teeth, and the water jet beams sprayed from the water holes on the sinking surface in the axial plane passing through the center line of the drill bit are at least partially overlapped with the working surfaces of the subsequent cutting teeth (the cutting teeth on the same blade). As shown in fig. 5, the fluid flow beam abcd formed from the water hole outlet to the rock downhole at least partially overlaps the cutting tooth.

Alternatively, water holes are provided in the core region of the bit body.

In the scheme, the hydraulic energy of the drill bit can be more effectively utilized by the central water hole of the outlet through which the axis of the drill bit passes, the central area of the drill bit is cleaned, rock debris is timely taken away from the well bottom, and the drill bit and the cutting teeth are effectively cooled.

Alternatively, the sinking surface is provided with a flat and long water hole.

Flat long water hole: the water holes with the outlet length obviously larger than the outlet width are flat and long water holes, which are called flat and long water holes for short.

In the above scheme, for the convenience of understanding, referring to the figure, d1 is the width of the outlet of the oblong water hole, and d2 is the length of the outlet of the oblong water hole as shown in fig. 6; here, the convention that the value of d2/d1 is greater than 1 means that the water hole is oblong. Obviously, when the water hole is irregular in the width direction and the length direction, the width is the maximum width and the length is the maximum length. The radial coverage area of the nozzle can be further increased by arranging the flat and long water holes, the cutting teeth are cooled in a balanced manner, the utilization rate of hydraulic energy is greatly increased, the cleaning effect of the water holes on the rock debris at the bottom of the well and the cooling effect of the cutting teeth are improved, and particularly in high-temperature geothermal drilling, the effect of the scheme is better and obvious.

Alternatively, the part of the working surface of the blade gauge protection section, which is close to the front side surface of the blade, shrinks towards the bit body to form a sinking surface.

The side of the blade that is forward in the direction of bit rotation is the blade leading side, as shown by item number 202 in fig. 1.

In the scheme, the part of the working surface, close to the front side surface of the blade, on the blade diameter-protecting section shrinks towards the drill body to form a sinking surface, so that the chip containing space of the whole drill bit is greatly increased, and the rock chip migration efficiency is greatly improved.

Alternatively, a nozzle or a water hole is arranged in the runner groove between the blades.

In the scheme, the drill bit body is also provided with the nozzles or the water holes, so that the drill bit can be cooled in an auxiliary manner, and the cleaning effect of well bottom rock debris is improved. The outlet shape of the water hole comprises a circle, a semicircle, an ellipse, a rectangle, a rhombus or a combination of the circle, the semicircle, the ellipse, the rectangle and the rhombus.

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

1. the drill bit structure has the advantages that the jet distance of the water holes is obviously shortened, the liquid flow jet speed on the working surface of the cutting teeth is higher, the bottom of a well can be cleaned in time, rock debris can be effectively transported, and the drill bit structure is suitable for soft, hard and soft-hard alternate strata. In addition, the jet distance is reduced, so that the energy consumption of liquid flow beams jetted from the water holes on the sinking surface of the blade is low, and the auxiliary damage effect on the rock at the bottom of the well is better. Meanwhile, the sinking surface is arranged on the blade, so that the chip containing space of the whole drill bit is increased, and the chip removing capability under the condition of adapting to rapid drilling is realized. Particularly, the water holes or the string-shaped water holes arranged on the cutter wing body can be better applied to geothermal drilling, so that the concentrated injection effect of the cutting teeth is increased.

2. When the water holes are corresponding to the cutting elements or the water holes on the blades are communicated to form string-shaped water holes, the covering area of the cutting elements is wider, the cooling of the cutting teeth is more balanced, and the cutting teeth are particularly suitable for high-temperature geothermal drilling.

3. When the water holes are simultaneously arranged on the upper and lower sinking surfaces of the blade working surface and in the runner groove, the cooling and chip removal capacity of the drill bit is further enhanced, the thermal wear of the cutting element is greatly weakened, and the sustainable and efficient drilling capacity of the drill bit is further improved.

Drawings

Fig. 1 is a schematic structural diagram of a drill according to an embodiment of the present invention.

FIG. 2 is a top view of the drill bit of FIG. 1.

FIG. 3 is a schematic view of a drill bit with blades and blades corresponding to the water holes on the sinking surface.

Fig. 4 is a cross-sectional view of one of the blades of the drill bit taken along the longitudinal direction of the sinking plane, and the sinking plane and the working contour line of the drill bit have the same trend.

FIG. 5 is a schematic view of the corresponding definition of water holes and cutting teeth, with the fluid flow beam abcd at least partially overlapping the working surface of the cutting teeth in the axial face of the drill bit.

FIG. 6 is a schematic view of a prolate water hole.

FIG. 7 is a schematic view of a sinking surface with a long and flat water hole.

FIG. 8 is a schematic view showing the covered area of the oblong water hole.

Fig. 9 is a schematic structural diagram of a drill according to an embodiment of the present invention, in which the blade cloth tooth surface in front of all the cutting teeth on the blade is sunk to form a smooth sunk surface.

Fig. 10 is a schematic structural diagram of a drill according to an embodiment of the present invention, in which the blade cloth tooth surfaces before all the cutting teeth on the blades are sunk to form a smooth sunk surface, and the working surfaces of the corresponding gauge sections are also sunk to form a sunk surface.

FIG. 11 is a schematic view of a drill with water holes in the core.

FIG. 12 is a schematic view of a drill with oblong holes in the runner channel.

Corresponding part names are labeled in the drawings: 1-bit body, 100-bit working contour line, 2-fixed blade, 21-cutting tooth, 22-blade water feeding hole, 23-buffer tooth, 201-blade cloth tooth surface, 202-blade front side surface, 3-runner groove, 31-round water hole in runner groove, 32-flat water hole in runner groove, 33-movable nozzle in runner groove, 4-sinking surface, 41-round water hole on sinking surface, 42-flat water hole on sinking surface, 51-central water hole, 6-cone palm, 61-cone, 62-cone tooth, 7-step gauge and bit gauge are flush.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Examples

The embodiment of the invention provides a diamond drill bit with a sinking surface on a blade. Referring to fig. 1 and 2, the drill bit comprises a drill bit body 1 and a plurality of blades 2 extending from the drill bit body 1 or fixed on the drill bit body 1, wherein cutting teeth 21 are arranged on the blades 2, and a runner groove 3 is arranged between adjacent blades 2, and is characterized in that: the drill bit is provided with at least one blade 2, the tooth surface 201 of the blade 21 in front of at least part of the cutting teeth 21 on the blade 2 is contracted towards the drill bit body 1 to form a sinking surface 4, and the sinking surface 4 is provided with a water hole 41. Sinking face 4 has not only increased the bits space that holds of drill bit, and sets up water hole 41 on sinking face 4, can show the jet distance that reduces water hole 41, can be timely, abundant cooling cutting teeth 21, reduces the emergence of thermal wear, can also transport the detritus that is produced by cutting teeth 21 with enough big energy simultaneously, reduces the probability that the mud bag takes place.

The water holes arranged on the sinking surface correspond to the cutting teeth, so that the jet distance of liquid flow can be greatly shortened, and the cutting teeth can be efficiently cooled, as shown in figures 3, 4 and 5. Obviously, in fig. 3 and 4, in addition to the water holes provided on the sinking surface, water holes may be provided on the blade working surface. The water holes correspond to the cutting teeth, and the liquid flow bundles abcd formed by the jet flows of the water holes from the water holes to the bottom of the well are at least partially overlapped with the working surfaces of the subsequent cutting teeth in the axial plane of the drill bit, as shown in fig. 5. In addition, the contour line of the sinking surface formed in the axial plane of the drill bit is the same as the trend of the working contour line 100 of the drill bit, so that the same distance from the water holes in the sinking surface to the working surface of the blade can be ensured, and the uniform cooling of the cutting teeth at different positions on the blade can be conveniently realized, as shown in fig. 4.

As a worker skilled in the art, it is more easily conceivable that the shape of the water hole on the sinking surface may be circular, semicircular, elliptical, rectangular, rhombic or a combination thereof. As shown in fig. 6, 7 and 8, the water holes are circular and are communicated with the rectangle, so that the radial coverage of the water holes on the blade can be enhanced, the cutting teeth can be cooled uniformly, and the scheme is more suitable for high-temperature geothermal drilling. The more preferable scheme is that the water holes on the blade are flat and long water holes, the radial tooth arrangement coverage area of the water holes is more than 60%, namely L1/L is more than or equal to 0.6, wherein L is the radial tooth arrangement coverage area, and L1 is the radial coverage area of the working end face of the blade reached by the liquid flow of the water holes, please refer to FIG. 8.

The blade cloth tooth surface in front of all the cutting teeth on the blade sinks to form a larger sinking surface, as shown in fig. 9. Further, the part of the teeth on the blade gauge section, which is adjacent to the front side surface of the blade, is contracted towards the bit body to form a sinking surface, as shown in fig. 10. The scheme is more beneficial to timely discharge of the rock debris formed by the cutting row.

The rock debris crushed by the cutting teeth finally enters the annular space through the chip discharge groove, and if the rock debris entering the chip discharge groove cannot be discharged smoothly, the rock debris can be blocked in the chip discharge groove, so that mud can be generated. In order to avoid the phenomenon, the invention also provides a technical scheme that water holes are simultaneously arranged on the blade and the drill body (or in the runner groove), and the cooling and chip removal capabilities of the drill bit are further enhanced, please refer to fig. 11 and 12. Fig. 11 shows a plan in which a central water hole is provided in the center of the drill, and fig. 12 shows a plan in which a flat and long water hole is provided in the flow channel groove, respectively.

The special description is that:

the above embodiments are exemplified by diamond bits having only fixed cutting structures, and in fact, the diamond bits also include hybrid diamond bits comprising cone cutting structures, disc cutter cutting structures, and percussion cutting structures. The cutting teeth used are generally conventional round PDC cutting teeth, and also comprise cutting teeth or cutting elements such as PDC teeth which can rotate around the central axis of the cutting teeth, special-shaped PDC teeth (comprising oval teeth, pointed teeth and the like), diamond composite teeth with three-dimensional working surfaces (such as ridge teeth, pointed cone teeth and the like), TSP teeth, diamond-impregnated cutting teeth and the like.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a diamond bit that has sinking face on wing, includes the drill bit body, extends from the drill bit body or fixes a plurality of wing on the drill bit body, be provided with the cutting tooth on the wing, be runner groove, its characterized in that between the adjacent wing: the drill bit is provided with at least one blade, blade cloth teeth in front of at least part of cutting teeth on the blade are contracted towards the drill bit body to form a sinking surface, and the sinking surface is provided with a water hole.

2. A diamond drill bit with countersinks on blades according to claim 1, wherein: alternatively, the profile of the sinking surface in the axial plane of the bit may be the same as the profile of the working profile of the bit.

3. A diamond drill bit with countersinks on blades according to claim 1, wherein: at least one water hole arranged on the sinking surface corresponds to the cutting teeth on the blade.

4. A diamond drill bit with countersinks on blades according to claim 1, wherein: the core area of the drill bit body is provided with water holes.

5. A diamond drill bit with countersinks on blades according to claim 1, wherein: the water holes arranged on the sinking surface are flat and long water holes.

6. A diamond drill bit with countersinks on blades according to claim 1, wherein: the blade diameter-protecting section and the blade cloth tooth surface are contracted towards the bit body to form a sinking surface.

7. A diamond drill bit with countersinks on blades according to claim 1, wherein: and a nozzle or a water hole is arranged in the runner groove between the blades.