KR20170036343A

KR20170036343A - Polycrystalline diamond compact bit for preventing one-sided wear of cutter

Info

Publication number: KR20170036343A
Application number: KR1020150135397A
Authority: KR
Inventors: 안양준; 정성준; 유영준; 김민성
Original assignee: 대우조선해양 주식회사
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2017-04-03

Abstract

The present invention relates to a polycrystalline diamond compact (PDC) bit to prevent one-sided wear, comprising: a body having a connection portion connected to a lower end portion of a drill pipe, and a cone portion pressed against a rock; a gear unit installed inside the cone; a motor to drive the gear unit; and a rotating body disposed on an outer side of the cone to be engaged with the gear unit having a cutter inserted in an outer surface thereof. The position of the cutter is adjusted by rotating a rotating body such that an entire cutter is uniformly worn; thereby greatly increasing the number of time of use and extending its lifespan, which is advantageous in terms of economy.

Description

[0001] 1. Field of the Invention [0002] The present invention relates to an anti-abrasion PDC bit,

The present invention relates to a wear prevention type PDC bit, and more specifically, by rotating the rotating body to adjust the position of the cutter, the specific cutter is uniformly worn without causing wear on the entire cutter, Wear-resistant PDC bit that can extend the lifetime of the wear-resistant PDC bit.

In general, drilling is a process of drilling a hole with a small diameter in the earth crust to obtain structure or property of the stratum, to obtain various knowledge in the crust, or to collect oil, natural gas, .

There are various sizes depending on the purpose of use, ranging from several meters to several thousand meters in length and several millimeters to several tens of centimeters in diameter.

Today, large-scale drilling to several meters in diameter is also carried out for use as a vertical tunnel.

According to the excavation method, there are an impact type in which a drill bit is impacted to crush rock to be drilled, and a rotary type in which a bit in which diamond and cemented carbide are inserted into an end of a pipe (pipe) is pushed and rotated around the rock surface.

1 is a cross-sectional view schematically showing a general drilling process.

A drill ship, that is, a riser 10, a casing pipe 20, and drilling strings of various diameters are used for drilling from crude oil drilling rig 1 suspended in the sea.

Between the drill rig 1 and the seabed is connected by a riser 10 and a BOP 12 which prevents the gas from climbing up and exploding when the drill bit 40 at the end of the riser 10 mis- Is installed. The BOP 12 blocks the entrance of the borehole when the gas is ejected from the seabed, thereby preventing damage to the drilling line.

And the casing pipe 20 and the drill pipe 30 are advanced to drill the seabed resources stored in the well located in the rock bed under the sea bed.

The casing pipe 20 is a member that advances to the bottom of the seabed beforehand before advancing the drill pipe 30 to the well, thereby preventing the drill pipe 30 from being exposed to seawater. When the casing pipe 20 is installed, the drill pipe 30 advances downward into the casing pipe 20 down to the oil well.

When the casing pipe 20 is moved downward to the bottom of the seabed or the drill pipe 30 is advanced to the oil well, the casing pipe 20 or the drill pipe 30 is not moved downward, The casing pipe 20 or the drill pipe 30 is connected and moved downward.

A drill bit 40 is mounted at the end of the drill pipe 30 at a different diameter according to the depth of drilling and a drill motor 32 for transmitting rotational power to the drill bit 40 is connected to the drill pipe 30 .

The drill pipe 30 is supplied with a mud. The drill rig 1 is provided with a supply pump 2 for supplying a mud to the drill pipe 30 and the mud is moved downward through the drill pipe 30 and discharged to the drill bit 40.

The mud discharged from the drill bit 40 is mixed with the crushed rock or the like by the drill bit 40 and is pushed up by the pressure of the mud continuously supplied through the drill bit 40. The upwardly directed mud is guided into the space between the casing pipe 20 and the drill pipe 30 and supplied to the drill rig 1 through the riser 10 (see arrows in Fig. 1).

The drill bit 40 provided at the lower end of the drill pipe 30 is rotated by the hydraulic power of the mud supplied through the feed pump 2 and the driving force of the drill motor 32. [

A hole is formed by the rotation of the drill bit 40, and the pieces of rock and soil generated in the drilling process are mixed with the mud and discharged to the outside of the drilling hole through the riser 10.

FIG. 2 is a front view showing a conventional PDC bit, and FIG. 3 is a plan view showing a conventional PDC bit with a cutter alone.

As shown in FIG. 2, the conventional PDC bit 40 is composed of a connecting portion 41 for connecting to the lower end of the drill pipe 30, and a body 42 having a cone portion pressed against the rock.

At the end of the cone portion, a plurality of cutters (C) made of diamond and cemented carbide are inserted.

However, since the position of the cutter is fixed in the conventional PDC bit as shown in FIG. 3, the wear of the cutter progresses more rapidly toward the outer portion of the bit, and the wear of the bit occurs due to the attachment position of the cutter, There is a problem of being shortened.

Registration No. 10-1069649

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cutting apparatus and a cutter which are capable of increasing the number of times of use and extending the service life, And an object of the present invention is to provide a wear-resistant type PDC bit.

In order to achieve the above-mentioned object, the anti-wear prevention type PDC bit of the present invention is coupled to the lower end of the drill pipe, and the rotating body having the cutter inserted therein is rotated to prevent wear on the cutter.

The anti-abrasion PDC bit of the present invention comprises a body having a connection portion connected to the lower end portion of the drill pipe, and a cone portion pressed against the rock; A gear unit installed inside the cone; A motor for driving the gear unit; And a rotating body disposed on the outer side of the cone so as to engage with the gear unit and to which a cutter is inserted.

The gear unit rotates the rotating body by the driving force of the motor to change the position of the cutter to prevent the abrasion of the cutter.

The gear unit is composed of three gears connected to the motor, and the teeth of the gear are configured to engage with teeth formed on the inner surface of the rotating body.

The cutter may be made of either diamond or cemented carbide.

As described above, according to the present invention, by regulating the position of the cutter by rotating the rotating body, it is possible to effectively prevent the single-wear phenomenon in which the specific cutter is worn as in the conventional art, and the entire cutter is worn uniformly, It increases the life span from 90 to 500, which is a great advantage in terms of economy.

1 is a cross-sectional view schematically showing a general drilling process;
2 is a front view showing the conventional PDC bit
FIG. 3 is a plan view showing a conventional PDC bit with a cutter-
4 is a perspective view showing a wear-resistant type PDC bit according to the present invention.
FIG. 5 is a conceptual view showing the internal structure of the rotating body of the anti-wear-resistant type PDC bit according to the present invention
Figs. 6 to 8 are diagrams for explaining the anti-wear prevention operation of the anti-wear-prevention type PDC bit of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a brief wear prevention type PDC bit according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a perspective view showing the anti-wear prevention type PDC bit according to the present invention, FIG. 5 is a conceptual view showing the internal structure of the rotation body of the anti-wear prevention type PDC bit according to the present invention, Fig. 5 is a view for explaining the operation for preventing the wear-prevention of the single-wear-resistant type PDC bit.

4 to 8, the anti-wear prevention type PDC bit 100 of the present invention is coupled to the lower end of the drill pipe 30, and includes a rotating body 140 having a cutter C inserted therein, So as to prevent uneven wear of the cutter (C).

The wear prevention type PDC bit 100 of the present invention includes the body 110, the gear unit 120, the motor 130, and the rotating body 140 do. The gear unit 120 refers to a plurality of gears.

The body 110 has a connecting portion 111 connected to the lower end of the drill pipe 30 and a cone portion pressed against the rock.

The gear unit 120 is provided inside the cone and is composed of three gears connected to the motor 130. The teeth 121 of the gear unit 120 are connected to teeth 141 formed on the inner surface of the rotating body 140 Respectively.

The motor 130 may be installed in each of the three gears, or may be installed in only one of the three gears.

The rotating body 140 is located outside the cone, and a plurality of cutters C are inserted into the outer surface. The rotating body 140 may be configured in the form of a chain.

The cutter C may be made of any one of diamond and cemented carbide.

The position of the cutter C can be changed by rotating the rotating body 140 by the gear unit 120 by the driving force of the motor 130 so that the uneven wear of the cutter C can be effectively prevented.

The operation of the anti-wear-resistant PDC bit according to the present invention will be described in detail.

At the end of the drill pipe 30, the wear-resistant type PDC bit 100 can be mounted with different diameters according to the depth of drilling.

The anti-abrasion-resistant PDC bit 100 rotates using the power of the drill motor 32.

The mud is supplied to the drill pipe 30, and the mud is moved downward through the drill pipe 30 to be discharged to the anti-wear prevention type PDC bit 100.

The discharged mud is mixed with the crushed rock or the like by the anti-wear prevention type PDC bit 100 and is pushed up by the pressure of the mud which is continuously supplied through the anti-wear prevention type PDC bit 100.

The upward mud is guided into the space between the casing pipe 20 and the drill pipe 30 and supplied to the drill rig 1 through the riser 10

6 to 8, the uneven wear prevention operation of the anti-wear prevention type PDC bit 100 of the present invention will be described.

When the abrasion of the cutter C occurs during the drilling operation (see Fig. 6), the anti-wear prevention type PDC bit 100 is lifted upward to reduce the pressure (see Fig. 7). Then, the motor 130 is driven to rotate the rotating body 140. The position of the worn-out cutter C and the worn-out cutter C are changed by the rotation of the rotating body 140. That is, the uncut cutter C is brought into contact with the rock (see FIG. 7). The excavation proceeds in this state.

By adjusting the position of the cutter C by rotating the rotating body 140 in this way, the wear of the specific cutter, which is worn by a specific cutter as in the conventional case, is effectively prevented, the entire cutter is uniformly worn, To 500 times, thereby prolonging the life span, which is a great advantage in terms of economy.

100: Anti-abrasion type PDC bit
110: Body
111:
120: gear unit
121: gear teeth
130: motor
140: rotating body
141:
C: Cutter

Claims

A connecting portion connected to a lower end portion of the drill pipe, and a body having a cone portion pressed against the rock;
A gear unit installed inside the cone;
A motor for driving the gear unit; And
And a rotating body disposed on the outer side of the cone so as to be engaged with the gear unit and having a cutter inserted in an outer surface thereof.

The method according to claim 1,
And wherein the gear unit rotates the rotating body by the driving force of the motor to change the position of the cutter to prevent the abrasion of the cutter.

The method according to claim 1,
Wherein the gear unit is composed of three gears connected to the motor, and the teeth of the gear are engaged with teeth formed on the inner surface of the rotating body.

The method according to claim 1,
Wherein the cutter is made of one of diamond or cemented carbide.

And a rotating body coupled to a lower end of the drill pipe and having a cutter inserted in an outer side of the cone so as to prevent uneven wear of the cutter.