SU1579975A1 - Dumper longitudinal and torsional oscillations - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells. The purpose of the invention is to simplify the design and control the degree of vibration damping. SUMMARY OF THE INVENTION: In an extinguisher, an outer surface of an elastic element is formed by intersection of two truncated cones or two cylinders, the inner surface is formed by a single cone or cylinder with two diametrically arranged symmetric inclined or parallel sections, with a central sector angle in the cross section of an elastic element along the outer surface of each cone or cylinder more than 180 °. 2 Il.

Description

1

semi-bodies 1,2 and shaft 3, repeating the shape of the elastic element 4. The outer surface of the element 4 is formed by the intersection of two truncated cones or two cylinders, the inner surface is formed by one cone or cylinder with two diametrically symmetric inclined or parallel sections. While the central spectral angle in the cross section of the outer surface of the element 4 is greater than 180.

The implementation of element 4 of this form allows one to extinguish large forces of torsional vibrations, and the volume occupied by element 4 during longitudinal movement of sub-bodies 1, 2 to each other can be more or less than the original or unchanged. Due to this, the use of the same material provides a wide range of variation in the elasticity and damping degree of the vibration damper as a whole. 8 il.

The invention relates to the drilling of oil and gas wells and is intended to dampen the longitudinal and torsional vibrations of a drilling tool in a well.

The purpose of the invention is to simplify the design and control the degree of vibration suppression.

Figure 1 shows the damper of longitudinal-torsional vibrations, a general view; figure 2 - section aa in figure 1; Figs 3 and 4 show a vibration damper with various embodiments of an elastic element; 5 and 6 show the node I in FIG. 3 with the initial and operating position of the elastic element, respectively; 7 and 8 show the node II in FIG. 4 with the initial and working position of the elastic element, respectively

The damper of longitudinal-torsional vibrations contains the upper half-body 1, the lower semi-body 2 with the shaft 3, interconnected with the possibility of transmitting torque, between which the elastic element 4, the connecting sleeve 5 connecting the upper 1 and lower 2 semi-body are placed, and also providing a preliminary static deformation of the elastic element 4. The outer surface of the elastic element 4 is formed by the intersection of two truncated cones or two cylinders and the inner surface is formed by one crnus or cylinder indrom with two diametrically arranged symmetrical inclined or parallel cuts, with the central sectorial angle in the cross section of the elastic element along the outer surface5

0

five

Q

Each of each cone or cylinder is greater than 180 °.

The damper torsional vibrations works as follows.

With the longitudinal or angular movement of the lower semi-body 2 relative to the upper semi-body 1, the elastic element 4 deforms. In this case, the energy of the longitudinal or torsional variable load is partially balanced by the energy of elastic deformation, and is partially absorbed by the internal damping forces of the elastic element 4. As a result, the amplitude of oscillations decreases.

Making the surfaces of the elastic element 4 by intersecting two truncated cones or cylinders allows, with a longitudinal compression of the latter, not only drastically reducing the volume occupied by the elastic elements 4 (Fig. 8) compared with the initial (Fig. 7) for soft materials, also leave it when the deformation of the elastic element of rigid material unchanged, or increase the volume (Fig.6) compared with the initial (Fig.5).

Making the outer surface of the elastic element 4 in cross section with a sectorial angle forming more than 180 ensures that the elastic element 4 transmits a larger torque value and better damping of torsional vibrations, since most of the volume of the elastic element 4 undergoes stress not shear, but compression, which leads to increase the carrying capacity of the latter.

In addition, the taper angle of me (Fig. 5.6 and 7.8) can be at pic, 51

This stiffness and the degree of damping of the elastic element 4 to obtain different values of the corresponding amplitude of the longitudinal strain, i.e. to ensure the versatility and effectiveness of the use of a particular material of the elastic element 4 under various operating conditions.

Claims (1)

Invention Formula A damper of longitudinal-torsional vibrations, comprising a housing, a hollow shaft, interconnected with the possibility of transmitting torque and repeating the shape of an elastic element located in front of them with 799756 parallel to the outer and inner surfaces, characterized in that, in order to simplify,. the design and control of the degree of vibration suppression, the outer surface of the elastic element is formed by the intersection of two truncated cones or two cylinders, the inner surface is formed by one cone or cylinder with two diametrically symmetric inclined or parallel cuts, and the central sectorial angle in the cross section of the elastic element on the outer surface of each cone or cylinder is greater than ISO & & 0 Phases 2 fig.Z FIG. five figl Srig, 7 ya