SU1679432A1 - Wave radiating element for holes - Google Patents

Abstract

This invention relates to seismic excitation. The purpose of the invention is to control the impact energy and reduce the level of interference. The wave emitter is placed in a predetermined array by means of submultiples, turned into a toron of wells with receiving sensors. A cylindrical rubber radiator chamber placed inside the case is pumped with air or liquid. A flat spring, located in the longitudinal window of the housing, is arched, breaks off the hook, and strikes the borehole wall with a hammer. The emitter is equipped with a mechanism that regulates the force of adhesion of the hammer with the body and, consequently, the energy of the elastic wave. There is a spring for returning the hammer to the initial position after relieving the pressure in chamber 2 or less.

Description

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The invention relates to the technique of seismic study of the stress state of a rock mass and can be used in mining conditions for the initiation of seismic vibrations.

The purpose of the invention is to control the impact energy and reduce the level of interference.

Figure 1 shows a downhole radiator in its initial state, a longitudinal section; Fig. 2 shows the same in the preparation and striking phase of the well wall.

The downhole wave emitter consists of a hermetic deformable chamber 1, body 2, made in the form of a cylinder with a window, leaf spring 3, pivotally fixed axis 4 on body 2. On the outside of the hinge with axis 4 there is a flat return spring 5. At the free end of the leaf spring 3 drummer 6 is fixed, the outer edge of which

Sharpened in the form of a hook. The fastening-disengaging mechanism is assembled on the body and consists of a swiveling pin 7 with an axis 8, a pneumatic piston 9, a spring 10, a rod 11 and an adjusting screw 12. The pneumatic cylinder 13 with a piston 9 is fixed on the end of an axial tube 14 rigidly connected with housing 2. The axial tube 14 has openings 15 for supplying the working fluid (air, liquid) to the deformable chamber 1. The housing is provided with an axial threaded hole 16 for connecting the blender rods or a bayonet device.

The emitter of the waves works as follows.

With the help of bilge rods, which are screwed into the threaded bore 16 or connected with a bayonet device, the emitter is placed at a predetermined location in the well and the striker 6 is oriented in the rear VI

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this direction. Through the billet rods, the axial tube 14, the working fluid or air from the pump is fed into the cylinder 13 and through the holes 15 into the deformable chamber 1. Under the pressure of the working fluid, the piston 9 moves and with its stem turns the check 7. As a result of the check 7 it hooks onto the drummer 6. With a further increase in the pressure of the working fluid, the deformable chamber expands to such an extent that it begins to arch the lamellar spring 3. After reaching a certain bend, the impactor 6 gets out of engagement with the check 7 and under the action of elastic energy the bent lamella th spring 3 strikes the borehole wall (figure 2). After that, the pressure in the system is reduced and the plate spring 3 under the action of the return spring 5 rotates around axis 4 and returns to the initial position (Fig. 1). In this case, the check 7 is rotated clockwise under the action of the spring 10 and the rod 11. The screw 12 can be adjusted in size; in engagement, checks 7 with drummer 6 for changing the impact energy. Then, the described sequence of actions is repeated to effect a subsequent strike.

The accuracy of seismic acoustic measurements in a mountain range largely depends on the nature of the impulse being sent. The accuracy of measuring the time of passage of an elastic wave between two sensors in an array depends on the ratio of the signal passing time to the duration of the front of the first entry. The shorter the front, the greater the measurement accuracy. The minimum front duration (5-50 µs) can be obtained by hitting the borehole wall.

a light striker having a high speed of movement, while the wall of the well at the point of impact should not collapse. The proposed well wave emitter makes it possible to regulate the impact energy over a wide range, which makes it possible to optimally adapt to specific rocks so that in each case the minimum duration of the front and, consequently, higher measurement accuracy is achieved.

Claims (1)

The invention The downhole wave emitter comprising a tripping mechanism connected to a cylindrical case that houses a drummer and a drive of a drummer, characterized in that, in order to regulate the impact energy and reduce the level of interference, a longitudinal window is mounted in the case. return spring and on the transverse axis with one end of the plate spring, at the other end of which the hammer is fixed, along the longitudinal axis of the housing there is a hermetic deformable chamber, inside which is placed an axial tube fixed to the housing, connected to the source of the working fluid, as well as to the channel of the sealed deformable chamber cavity by a hydraulic or pneumatic cylinder, the piston rod of which is in contact with the swiveling check installed on the housing on the other hand, the pivot checks are arranged in contact with the adjusting screw and the spring. / L H -7 77 1 Compiled by T.Raykova Tehred M. Morgental Proofreader O. Tsiple Editor N. Tupitsa Order 3212 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow. Zh-35, Raushsk nab ,, 4/5 15 7/5 # FIG. 2 Proofreader O. Tsiple