CN205743724U - A kind of impregnated piece of mixed self-adapting drill bit of PDC - Google Patents

Abstract

The utility model discloses a PDC impregnated block mixed self-adaptive drill bit, which is composed of a steel body, several self-adaptive elements and several PDC teeth-impregnated block mixed cutting blades, the PDC tooth-impregnated block mixed cutting tool The wing is fixed on the steel body through the pin shaft, and several adaptive elements are respectively fixed between the steel body and the PDC tooth-impregnated block hybrid cutting blade; when drilling in soft to medium hard formations, the PDC bit starts The main cutting function, when drilling hard formations, the impregnated diamond bit plays the main role of rock breaking, which greatly improves the adaptability of the bit to the formation, and can also maintain the high-efficiency rock breaking characteristics of the bit, reducing the number of times to replace the bit. The drill bit of the utility model is simple in structure, and the blades are easy to disassemble. By combining the advantages of the PDC bit and the impregnated diamond bit, the adaptability of the drill bit to the stratum is greatly improved, which can not only maintain the high-efficiency rock-breaking effect of the bit, but also reduce the impact of the stratum on the PDC. The occurrence of tooth impact damage.

Description

A hybrid self-adaptive drill bit with PDC impregnated block

technical field

The utility model relates to a drill bit in the field of drilling, in particular to a PDC impregnated block hybrid self-adaptive drill bit.

Background technique

PDC bit and impregnated diamond bit are two main rock breaking tools, which are widely used. The back rake angle of PDC bit has a significant impact on drilling speed and bit life. When drilling into soft formations, the smaller the angle, the better the mechanical drilling efficiency. When drilling into hard formations, the back rake angle is increased appropriately, which is beneficial to reduce the frontal impact force of rock impact on PDC teeth and improve the life of the drill bit. In general, the PDC bit has a good ROP in soft to medium hard rock formations, but in hard to hard formations, highly abrasive formations, soft and hard interlayers, gravel interlayers, and broken rock formations, the PDC teeth are prone to collapse, Fracture, the life of the drill bit and the ROP have dropped sharply. At present, the impregnated diamond bit with a lower matrix hardness is mainly used for drilling in hard to hard formations. The drilling speed is much lower than that of PDC bit and impregnated diamond bit with higher matrix hardness.

In order to improve the adaptability of the drill bit to the formation, especially the drill bit suitable for formations such as hard to hard formations, highly abrasive formations, soft and hard interlayers, gravel interlayers, and broken rock formations, some scholars have carried out relevant research: such as Southwest Petroleum University Utility Model Patent "A Hybrid Drill Bit" Patent No.: CN103147691A, the drill bit disclosed in this patent is a combination of gear teeth and fixed cutting teeth. In the process of drilling, there is no successive level of broken rock, and the special advantages of a certain drill bit structure in drilling into a certain formation cannot be brought into play; another example is the utility model patent of Chengdu Huilingfeng Diamond Bit Co., Ltd. Hybrid drill bit with composite sheet and diamond impregnated block", patent number: CN203701990U, the drill bit is provided with a diamond composite sheet and a diamond-impregnated block on each blade, and the diamond-impregnated block is used to assist rock breaking, the same as before Like the first patent, the cutting angle of the diamond composite sheet of the drill bit is fixed, and a reasonable cutting method cannot be selected according to the stratum; The PDC bit can adaptively change the back dip angle, but the bit has a good drilling effect in the complex formation of soft to medium-hard rock formation, while in the hard formation, it can only protect the PDC teeth, reduce the occurrence of abnormal damage, and have great impact on drilling. There is no noticeable increase in speed.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned problem that the existing PDC bit has poor adaptability to the formation, especially when drilling into hard to hard formations, highly abrasive formations, soft and hard interlaced interlayers, gravel interlayers, and broken rock formations. In formation, the PDC drill bit is prone to problems such as cutter breakage, delamination and other unconventional wear phenomena, and a PDC impregnated block hybrid self-adaptive drill bit is provided.

The utility model is composed of a steel body, several self-adaptive elements and several PDC tooth-impregnated block mixed cutting blades. Two self-adaptive elements are respectively fixedly arranged between the steel body and the PDC tooth-impregnated block hybrid cutting blade;

The PDC tooth-impregnated insert hybrid cutting blade is composed of several PDC teeth and several impregnated inserts, and the several PDC teeth are respectively arranged on several impregnated inserts;

The initial working angle a of the PDC teeth on the hybrid cutting blade of the PDC teeth-impregnated insert is 0-10°;

The height of the impregnated insert is lower than the upper working layer of the PDC teeth.

Working principle and process of the utility model:

During the drilling process, because the working layer of the PDC tooth is higher than the impregnated insert, the rock is preferentially pressed into the rock, and it will receive the reaction force of the rock formation during the rotation process, and the PDC tooth-impregnated insert hybrid cutting blade will center on the pin axis. Rotate, the PDC tooth tilts backward, and the impregnated block is raised to contact with the rock. When drilling into soft rock, the reaction force of the rock formation is small. At this time, the PDC teeth play the main cutting role; when drilling into hard rock, the reaction force of the rock formation is relatively large, and the back dip angle of the PDC teeth also changes greatly. The impregnated block contacts with the rock formation to break the rock. The rocks are broken simultaneously with the impregnated blocks, but the crushed rocks are mainly ground by the impregnated blocks.

The beneficial effects of the utility model:

The structure of the drill bit of the utility model is assembled, which is convenient for disassembly and replacement of parts. The drill bit can self-adaptively select a reasonable cutting method and cutting angle according to the softness and hardness of the stratum. , the impregnated block in the hard rock layer plays the main role of rock breaking, which can not only maintain the high-efficiency rock breaking effect of the drill bit, but also reduce the occurrence of impact damage to the PDC teeth by the formation, without frequent replacement of soft and hard bits, improving work efficiency and cost .

Description of drawings

Fig. 1 is a perspective view of the first embodiment of the utility model.

Fig. 2 is a schematic diagram of the working principle of the first embodiment of the utility model.

Fig. 3 is a schematic perspective view of the second embodiment of the utility model.

Fig. 4 is a schematic diagram of the working principle of the second embodiment of the present invention.

detailed description

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model is composed of a steel body 1, several self-adaptive components 2 and several PDC teeth-impregnated block hybrid cutting blades 3, and the PDC teeth- The impregnated block mixed cutting blade 3 is fixedly arranged on the steel body 1 through the pin shaft 4, and several adaptive elements 2 are respectively fixedly arranged between the steel body 1 and the PDC tooth-impregnated block mixed cutting blade 3;

The PDC tooth-impregnated insert hybrid cutting blade 3 is composed of several PDC teeth 5 and several impregnated inserts 6, and the several PDC teeth 5 are respectively arranged on several impregnated inserts 6;

The initial working angle a of the PDC tooth 5 on the hybrid cutting blade 3 of the PDC tooth-impregnated insert is 0-10°;

The height of the impregnated block 6 is lower than the upper working layer of the PDC tooth 5 .

Working principle and process of the utility model:

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4. During the drilling process, because the working layer of the PDC tooth 5 is higher than the impregnated block 6, it is preferentially pressed into the rock, and will be subjected to the reaction force of the rock formation during the rotation process. , the PDC tooth-impregnated insert hybrid cutting blade 3 will rotate around the pin shaft 4, the PDC tooth 5 will tilt backward, and the impregnated insert 6 will be raised to contact with the rock. When drilling into soft rock, the rock reaction force Smaller, under the action of the adaptive element, the PDC tooth 5 has a small back dip angle change, and the impregnated block 6 cannot touch the rock. At this time, the PDC tooth 5 plays the main cutting role; when drilling into hard rock, the rock formation reaction force is relatively small. Larger, PDC tooth 5 back dip angle change is also larger, impregnated block 6 contacts with the rock formation to crush rock, at this time PDC tooth 5 and impregnated block 6 crush rock at the same time, but the impregnated block grinds rock mainly.

Claims (4)

1. impregnated piece of mixed self-adapting drill bit of a PDC, it is characterised in that: be by steel body (1), several self adaptation element (2) and Impregnated piece of several PDC teeth mixing cutting wing (3) composition, impregnated piece of PDC tooth mixing cutting wing (3) is by bearing pin (4) Being fixedly installed on steel body (1), several self adaptation elements (2) are respectively fixedly disposed at steel body (1) and impregnated piece of PDC tooth mixes Close between cutting wing (3).

A kind of impregnated piece of mixed self-adapting drill bit of PDC the most according to claim 1, it is characterised in that: described PDC tooth is pregnant Insert mixing cutting wing (3) is made up of several PDC teeth (5) and several impregnated piece (6), and several PDC teeth (5) are separately positioned on On several impregnated piece (6).

A kind of impregnated piece of mixed self-adapting drill bit of PDC the most according to claim 2, it is characterised in that: described PDC tooth is pregnant PDC tooth (5) initialization angle a in insert mixing cutting wing (3) is 0-10 °.

A kind of impregnated piece of mixed self-adapting drill bit of PDC the most according to claim 2, it is characterised in that: described impregnated piece (6) Upper surface height less than PDC tooth (5) upper surface height.