SU1756475A1 - Drilling method - Google Patents

Abstract

The essence of the invention: the tool is informed about the planetary movement along the bottom of a well. At the same time, the body is rotated around its longitudinal axis. The tool is rotated around an axis perpendicular to the longitudinal axis of the body. The central part of the tool is given a rotation in the die opposite to the direction of rotation of its peripheral part. In this case, the rotational speeds of the body and the tool are interconnected by a certain ratio of 1 sludge.

Description

The invention relates to mining and construction, and in particular to methods of mechanical destruction of rocks during drilling.

There is a known method of rotary drilling of rocks, in which a large axial load and a large torque are applied to the tool. The destruction of the rock in this case occurs by cutting chips.

However, the rotational drilling method is very energy intensive and requires the application of significant axial loads.

Closest to the proposed method of drilling wells is a method according to which the tool is informed of planetary movement downhole.

The disadvantage of this method of drilling is its low productivity when drilling over hard rocks, the need to apply large axial loads and, consequently, a large dynamic imbalance experienced by the working tool.

The purpose of the invention is to increase the productivity of drilling while reducing the dynamic loads on the working tool.

The goal is achieved by the fact that in the method of drilling wells, according to which a tool is reported to have a planetary motion, downhole the well simultaneously rotates the body around its longitudinal axis, rotating the tool around an axis perpendicular to the longitudinal axis of the body, while rotation in the direction opposite to the direction of rotation of its peripheral part, and the rotational speeds of the body and the instrument parts are related by

p to + d a) raft + d ufc,

where n is the distance from the axis of rotation of the body to the center of the shoulder of the central part of the instrument, m;

cl

with

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 VI

with

Г2 distance from the axis of rotation of the body to the center of the peripheral part of the working tool, m;

d - tool diameter, m;

w is the angular velocity of the central part of the instrument,

0) 2, is the angular velocity of the peripheral parts of the instrument, s;

ok - body angular velocity, s.

At the rotational speeds of the parts of the working tool, the most uniform processing of all parts of the bottom hole occurs during drilling, since the integral speed of meeting of rock-breaking elements of the working tool with the rock is approximately the same at the central part of the working tool and at its periphery. wear of destructive elements.

I la the drawing shows the scheme of the working tool.

The working tool consists of a central 1 and a peripheral 2 parts, placed on concentric shafts, mounted on the case 3 and rotating together with the case around its longitudinal axis 0-0 with an angular velocity Ok. In addition, the central part 1 of the working tool rotates around the axis of OrOi on the side opposite to the direction of rotation of the peripheral parts 2 with different angular velocities a and hell. The speed of the impact of the working element placed on the working tool at any point of its working surface will be composed of two speeds - the speed of movement of this element when the body rotates around its longitudinal axis 0-0 and the speed of this element when it rotates around the axis Oi-Oi perpendicular to the longitudinal axis of the housing. Since for each point of the working surface, i.e. for each working element, the speed from rotation about the axis 0-0 will be different; to average the acting forces, we can take the average value of the velocity point on the working surface of the central part of the working tool at a distance n from the axis 0-0;

Then, on the peripheral part of the working tool, the midpoint will be located at a distance n from the same axis 0-0,

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five

0

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If these speeds are equated to compensate for the dynamic forces on the working tool, it will be obtained that the angular velocities of rotation of the tool body and the parts of the working tool will be related by the relation

P Sc + d UJ1 G2OD duЈ,

where n is the distance from the axis of rotation of the body to the center of the shoulder of the central part of the instrument, m;

G2 — distance from the axis of rotation of the body to the center of the peripheral part of the working tool, m;

d - tool diameter, m;

ЈWi is the angular velocity of the central part of the instrument,

 - the angular velocity of the peripheral parts of the tool, with,

ada - hull angular velocity,.

Claims (1)

Invention Formula A method of drilling a well, according to which a tool is reported to have a planetary movement downhole, while simultaneously rotating the body around its longitudinal axis, characterized in that, in order to increase drilling productivity while reducing dynamic loads on the central and peripheral parts of the tool, the tool rotates around the axis located to the longitudinal axis of the body, while the central part of the instrument is given rotation in the direction opposite to the direction of rotation of its periphery malarial portion, the rotational speed of the tool housing and associated parts ratio pom + d al rsufc + duu where n is the distance from the axis of rotation of the body to the center of the shoulder of the central part of the instrument, m; ha — distance from the axis of rotation of the body to the center of the peripheral part of the working tool, m; d - tool diameter, m; w - the angular velocity of the central part of the instrument, (t) 2 - the angular velocity of the peripheral parts of the tool, juice - angular velocity of the hull,. ABOUT us. ABOUT,-