SU1836533A3 - Drilling tool - Google Patents

Description

The invention relates to mining and is intended for drilling wells in unstable rocks with simultaneous wall fastening.

The purpose of the invention is to increase the efficiency of well drilling by increasing the intensity of the destruction of rocks at the bottom and reducing friction when moving casing.

In Fig.1 shows a longitudinal section of a drill: in Fig.2 - node A in Fig.1 (mounting the centering bearing); in Fig.3 - view B in Fig.1; figure 4 is a section 1-1 in figure 1; figure 5 - section 2-2 in figure 1.

The drill contains a casing 1 and a double drill string, consisting of an outer casing 2 and an inner core pipe 3, with rock break 1836533 AZ ——

With a drilling tool 4. A double drill string is placed in the casing 1 with the possibility of limited axial movement. The outer casing 2 of the double drill string is equipped with vibrators 5 and 6, respectively, of longitudinal and transverse vibrations.

The longitudinal vibrator 5 is made in the form of an annular shoulder 7 with cams 8. connected to the lower end of the casing 1 and a spring-loaded shock rod 9 with cams 10 mounted on the drill string body with the possibility of axial movement of joint rotation and interaction of its cams 10 with cams 8 of the ring collar during rotation of the drill string.

The projectile is also equipped with a lateral vibrator 6. made in the form of ex3 centric weights 11 fixed on the outer surface of the casing 2 of the drill string and interacting with the casing string 1 through bearings 12.

The annular collar 7 is dressed on the outer pipe 2 and moves longitudinally in the slots 13 on the ball keys 14. On top of the annular collar 7 is spring-loaded 15 relative to the drill string.

Drill works as follows.

When the double column rotates, the rotational movement through the ball keys 14 is transmitted to the annular collar 7 and the cams 8, raising the vibrator, which, under the influence of its own weight and the force of the pre-compressed spring 15, inflicts blows in the axial direction. The energy transmitted by shock, contributes to the supply of casing 1 down under the influence of its own weight and axial force from the vibrator.

When driving loose deposits during drilling, the rock resistance increases, the main discharge will be due to the vibrator of transverse vibrations 6, made in the form of eccentric loads 11, due to which the column gets paced in the radial direction. Since the string is supported through the sleeve 16 and the bearing 12 on the inner walls of the casing 1, mutual friction is thereby eliminated, reducing the required drive power and pipe wear. The vibration generated by the eccentric weights 11 is transmitted to the casing string, thereby reducing the resistance of the rock to the movement of the casing 1 along the well.

The effectiveness of the impact of the equipment surface (both simple axial load and vibration) will decrease as the mass of the double casing shell increases.

The installation of several transverse vibrators placed on the body over the entire length of the double projectile at certain intervals will allow, when creating vibrations and transferring them to the casing, to drastically reduce the friction coefficient by the outer walls of the casing and the rocks in contact with them.

Claims (1)

Claim A drill, including a casing, a drill string with a rock cutting tip and a longitudinal vibrator, made in the form of cams interacting with each other and placed on the casing and drill string, characterized in that, in order to reduce friction when moving the casing, the drill string is equipped with a transverse vibrator made in the form of eccentric weights mounted on the outer surface of the drill string with the possibility of interaction with the casing through bearings. FIG. /