CN211950347U

CN211950347U - PDC drill bit adopting high-low pressure combined nozzle

Info

Publication number: CN211950347U
Application number: CN202020624645.3U
Authority: CN
Inventors: 刘成亮; 杜起浪
Original assignee: Chengdu Deep Diamond Bit Co ltd
Current assignee: Chengdu Deep Diamond Bit Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-11-17
Anticipated expiration: 2030-04-23

Abstract

The utility model discloses an adopt PDC drill bit of high-low pressure combination nozzle, including connecting (1) and drill bit body (2), the crown surface of drill bit body (2) is provided with a plurality of wing (3) along circumference, forms chip groove (4) between adjacent wing (3), is equipped with a plurality of low pressure nozzle (5) in chip groove (4), wing (3) crown surface is along radially being equipped with multirow cutting teeth (6), the rake face of the shoulder of wing (3) adopts the stepped structure to be provided with L type step (7), install at least one high pressure nozzle (8) on the step face of L type step (7). The utility model discloses in, high pressure nozzle (8) and low pressure nozzle (5) collocation had both been favorable to the cooling and washing to drill bit key point cutting teeth (6), are favorable to the whole chip removal of drill bit again, promote the detritus migration ability of drill bit, prolong the life of cutting teeth.

Description

PDC drill bit adopting high-low pressure combined nozzle

Technical Field

The utility model belongs to the technical field of the well drilling drill bit and specifically relates to an adopt PDC drill bit of high-low pressure combination nozzle.

Background

In recent years, fixed cutter PDC bits have been increasingly used for more complex operating conditions as PDC bit technology has evolved and improved, which also presents higher challenges to PDC bit performance. Typically, the cutting teeth of a PDC bit are welded to blades, where the cutting teeth at different locations cut different areas of the rock, but the area of each cutting tooth that cuts the rock is substantially fixed. In hard abrasive stratum and complex directional drilling operation, because the cutting teeth on the shoulder of the PDC drill bit are farther away from the central axis of the drill bit, the linear speed of the cutting teeth on the shoulder of the drill bit is high in the rotary drilling process, the local cutting area of the cutting teeth has high temperature, the wear resistance is poor, and therefore the cutting teeth are always worn down firstly to lose the attack force, the service life of the drill bit is greatly limited, and the drilling cost is higher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned problem, provide an adopt PDC drill bit of high-low pressure combination nozzle.

The utility model provides an adopt PDC drill bit of high-low pressure combination nozzle, including joint and drill bit body, the crown surface of drill bit body is provided with a plurality of blades along circumference, forms the chip groove between the adjacent blade, be equipped with a plurality of low pressure nozzles in the chip groove, blade crown surface is equipped with multirow cutting teeth along radial, the rake face of the shoulder of blade adopts the step structure to be provided with L type step, install at least one high pressure nozzle on the step face of L type step and be used for wasing the main cutting tooth of cooling drill bit shoulder; the primary cutting teeth are brazed to the blades.

The high-pressure nozzle arranged on the L-shaped step and the low-pressure nozzle arranged in the chip groove are communicated with a central flow channel of the drill bit, the high-pressure nozzle points to the main cutting teeth on the shoulder of the drill bit and is mainly used for cleaning and cooling the main cutting teeth on the shoulder, the influence of local instantaneous high temperature and mud bags in a cutting area on the wear resistance of the shoulder cutting teeth is eliminated, the practical service life of the cutting teeth is prolonged, and the low-pressure nozzle is used for cleaning and cooling the whole drill bit; the combination of high pressure nozzle and low pressure nozzle sets up, makes things convenient for the whole chip removal of drill bit when cooling and washing the cutting teeth, prevents drill bit mud package tendency, has promoted the detritus migration ability of drill bit.

Furthermore, the PDC drill bit adopting the high-low pressure combined nozzle is characterized in that the crown surface section of the drill bit body is divided into an inner cone, a nose part, a shoulder part, an outer shoulder part and a gauge according to the region from the center of the drill bit to the outside in sequence.

Further, the PDC drill bit adopting the high-pressure and low-pressure combined nozzle is characterized in that the high-pressure nozzle and the low-pressure nozzle are distinguished by the flow speed of the slurry sprayed out through the nozzles and the flushing pressure acting on the surfaces of the main cutting teeth; the distance from the low pressure nozzle mouth to the shoulder main cutting tooth surface is longer than the distance from the high pressure nozzle mouth to the shoulder main cutting tooth surface; the flow rate of the slurry at the outlet of the high-pressure nozzle is higher than that at the outlet of the low-pressure nozzle; the inner hole diameter of the high-pressure nozzle is smaller than that of the low-pressure nozzle.

The utility model discloses the beneficial effect who reaches:

1. the utility model discloses a wing of a knife shoulder adopts stepped structure, is provided with high-pressure nozzle on the L type step and washs and cools off shoulder cutting teeth, has prolonged shoulder cutting teeth's practical life.

2. The utility model discloses a high pressure nozzle directly sets up on the wing, and for the low pressure nozzle of setting in the chip groove, high pressure nozzle is closer apart from shoulder owner cutting teeth stroke, and hydraulic energy loss is also still less, has promoted the washing and the cooling effect of shoulder cutting teeth.

3. The utility model discloses a shoulder cutting teeth is under high pressure nozzle's washing, and the cutting teeth cutting area's temperature in the twinkling of an eye is very low, reduces the wearability loss that local high temperature that the cutting teeth received brought.

4. The combination of the high-pressure nozzle and the low-pressure nozzle facilitates the integral chip removal of the drill bit while cooling and washing the cutting teeth at the key part of the drill bit, prevents the inclination of mud pocket of the drill bit and improves the rock debris transportation capability of the drill bit.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the crown area of the drill of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Wherein: 1-a linker; 2-a drill bit body; 3-a blade; 4-chip removal groove; 5-a low pressure nozzle; 6-cutting teeth; 7-L-shaped steps; 8-a high pressure nozzle; 9-drill center flow channel; 10-inner cone; 11-nose portion; 12-shoulder; 13-outer shoulder; and 14-gauge protection.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.

Examples

In this embodiment, as shown in fig. 1, a PDC drill bit using a high-pressure and low-pressure combined nozzle includes a joint 1 and a drill bit body 2, a plurality of blades 3 are circumferentially arranged on an outer surface of a crown of the drill bit body 2, a chip discharge groove 4 is formed between adjacent blades 3, a plurality of low-pressure nozzles are arranged in the chip discharge groove 4, a plurality of rows of cutting teeth 6 are radially arranged on the outer surface of the crown of the blades 3, an L-shaped step 7 is arranged on a rake face of a shoulder of the blade 3 in a stepped structure, and at least one high-pressure nozzle 8 for cleaning and cooling main cutting teeth 6 on the shoulder of the drill bit is mounted on a step face of the L-shaped step 7; the main cutting tooth 6 is brazed to the blade 3.

In the embodiment, as shown in fig. 3, a PDC drill bit using a high-pressure and low-pressure combined nozzle is provided, wherein a high-pressure nozzle 8 provided on an L-shaped step 7 and a low-pressure nozzle provided in a chip groove 4 are both communicated with a central flow channel 9 of the drill bit, the high-pressure nozzle 8 is directed to a main cutting tooth 6 on a shoulder of the drill bit, and is mainly used for cleaning and cooling the main cutting tooth 6 on the shoulder, so that the influence of local instantaneous high temperature and mud pockets of the cutting tooth 6 on the wear resistance of the cutting tooth 6 on the shoulder is eliminated, the practical life of the cutting tooth 6 is prolonged, and the low-pressure nozzle is used for cleaning and cooling the whole drill bit; the combination of the high-pressure nozzle 8 and the low-pressure nozzle facilitates the whole chip removal of the drill bit when the cutting teeth 6 are cooled and washed, prevents the inclination of mud bags of the drill bit, and improves the rock debris transportation capacity of the drill bit.

In this embodiment, as shown in fig. 2, the PDC drill bit using the high-low pressure combined nozzle has a crown surface section of the bit body 2 divided into an inner cone 10, a nose portion 11, a shoulder portion 12, an outer shoulder portion 13, and a gauge 14 in sequence from the center of the bit to the outside by area.

In the embodiment, the PDC drill bit adopting the high-pressure and low-pressure combined nozzle is adopted, and the high-pressure nozzle 8 and the low-pressure nozzle are distinguished by the flow speed of the slurry sprayed out through the nozzles and the flushing pressure acting on the surface of the main cutting tooth 6; the distance from the nozzle mouth of the low-pressure nozzle to the surface of the shoulder main cutting tooth 6 is longer than the distance from the nozzle mouth of the high-pressure nozzle 8 to the surface of the shoulder main cutting tooth 6; the flow rate of the slurry at the outlet of the high-pressure nozzle 8 is higher than that at the outlet of the low-pressure nozzle; the inner bore diameter of the high pressure nozzle 8 is smaller than the inner bore diameter of the low pressure nozzle.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the knowledge of the above embodiments and the description illustrates the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an adopt PDC drill bit of high-low pressure combination nozzle, includes joint (1) and drill bit body (2), its characterized in that, the crown surface of drill bit body (2) is provided with a plurality of blades (3) along circumference, forms chip groove (4) between adjacent blade (3), be equipped with a plurality of low pressure nozzle (5) in chip groove (4), blade (3) crown surface radially is equipped with multirow cutting teeth (6), the rake face of the shoulder of blade (3) adopts the stepped structure to be provided with L type step (7), install on the step face of L type step (7) at least one high pressure nozzle (8) and be used for wasing main cutting teeth (6) of cooling bit shoulder.

2. The PDC drill bit with the high-low pressure combined nozzle is characterized in that the high-pressure nozzle (8) arranged on the L-shaped step (7) and the low-pressure nozzle arranged in the chip groove (4) are communicated with a central flow channel (9) of the drill bit, the high-pressure nozzle (8) points to the main cutting teeth (6) on the shoulder of the drill bit and is mainly used for cleaning and cooling the main cutting teeth (6) on the shoulder, and the low-pressure nozzle (5) is used for cleaning and cooling the whole drill bit.

3. A PDC bit using a combined high and low pressure nozzle according to claim 1 wherein the primary cutting teeth (6) are brazed to the blades (3).

4. The PDC bit using the high-low pressure combination nozzle of claim 1, wherein the crown profile of the bit body (2) is divided into an inner cone (10), a nose portion (11), a shoulder portion (12), an outer shoulder portion (13) and a gauge (14) in sequence by regions from the center of the bit outward.

5. A PDC bit using a combination high and low pressure nozzles according to claim 1 wherein the high pressure nozzle (8) is distinguished from the low pressure nozzle (5) by the flow velocity of the slurry after it is ejected through the nozzles and the flushing pressure acting on the surface of the primary cutting teeth (6).

6. A PDC drill bit using a combination of high and low pressure nozzles according to claim 5, wherein the low pressure nozzle (5) mouth reaches the shoulder primary cutter (6) surface a distance farther than the high pressure nozzle (8) mouth reaches the shoulder primary cutter (6) surface.

7. A PDC bit using a combination of high and low pressure nozzles according to claim 5, wherein the mud flow rate at the outlet of the high pressure nozzle (8) is higher than the mud flow rate at the outlet of the low pressure nozzle (5).

8. A PDC bit with a combined high and low pressure nozzle according to claim 1 wherein the inner bore diameter of the high pressure nozzle (8) is smaller than the inner bore diameter of the low pressure nozzle (5).