SU657381A1 - Geophysical measuring probe for determining the shape and dimensions of underground cavities by ultrasonic echo technique - Google Patents

Description

This probe has no reference section 13. Obtaining data on the dependence of the velocity og density is possible only by means of samples or when there is an embedded instrument for measuring this velocity. In the method of sampling, due to the difference in time when measuring ultrasound sizes and determining speed, for example, the effect of temperature variation may occur, which has a negative effect on determining the exact distance and may give a distorted picture of the shape and size of voids. The purpose of the invention is to improve the measurement accuracy. The invention is based on the task of creating a geophysical probe, in which, along with a reference section for determining speed, there is an ultrasonic transducer installed with the possibility of tilting and turning, which will allow accurate determination of the size and size of underground voids filled with gases or liquids. The goal is achieved in such a way that the measuring probe consists of a head connected to the drilling measuring cable, the middle part and the bottom part, which is the reference length for determining the radiation speed, the middle and bottom parts are turning parts; the head comprises a rotary actuator housing filled with oil, a pressure or compression compensator and a rotation actuator; on the axis of the probe in the middle part there is an ultrasonic transducer with the axis of the pellet, which, thanks to the electromagnetic tilting drive, can be tilted out; the tipping drive consists of an electromagnet, a crank drive with a ratchet mechanism with water, a ball stop and a system of tamping bars with a holder for an ultrasonic transducer; The parallelogram-shaped tilting m system is assembled so that in the folded-down state the ultrasonic transducer can radiate vertically up. The ratchet drive step size is chosen so that it is possible that the direction-finding axis is almost continuous. The tilting drive is designed so that when the drive mechanism fails, the ultrasonic transducer tilts back when external forces act on it, for example, through casing fixture due to the actuation of the stopper, deflection of the tilting t g or folding. An electrical contact signals the position of the ultrasound transducer. Using the described device, it is possible to measure ultrasound by means of signaling underground cavities filled with liquids and gas, and the direction finding axis of the ultrasonic transducer after it has been tilted out of the body tube can be installed in any direction. FIG. 1 shows the proposed probe; in fig. 2 - folding drive. The measuring probe consists of a head & 1, a rotatably hardened middle part 2 with a folding ultrasonic transducer 4 and a lower part 3 with a reference length 5 and an ultrasonic transducer 6. A drilling measuring cable is connected to the head for transmitting the measured values and supplying voltage. The rotational drive housing in the head is filled with oil and contains a pressure or expansion compensator connected to the external environment. The rotating drive consists of the engine, the transmission of the rotating shaft with bearing. On the rotating shaft, contact rings are fixed, which, through brushes, perform electrical communication. Through a rotating shaft, electrical wiring is supplied to the rotating part of the probe. At the bottom of the flip drive, there is an enclosed electronic part 7 with the necessary electronic equipment. The middle part 2 hangs on a rotating shaft and contains a tilt drive with an ultrasonic transducer 4. The tilt drive operates in a cavity environment. The electromagnet 8 drives the crank-schatunny mechanism 9 through the ratchet mechanism 10 with a gear wheel and a ball stop 11. The mechanism 9 periodically tilts in the form of a parallelogram with the holder 13 tilts the ultrasonic transducer 4 on them, the safety pin, The ball stop 11 and the diverting element 14 of the tipping bars 12 allow the ultrasonic transducer 4 to be inserted into the body of the tilting drive. Located in the lower part 3 of the reference segment has in its upper part of the hole.

Claims (4)

1. Geophysical measuring probe for determining the shape and size of underground cavities using the ultrasonic echo method, comprising a head connected to the drilling measuring cable, a middle and lower sections, connected to a rotational drive of these sections, ultrasound 1e transducers placed in the middle and lower sections x, and pressure and expansion joints, characterized in that, in order to increase the accuracy of the measurements, the middle section contains a horizontal rotation drive connected through a vertical rotation mechanism with one and ultrasonic transducers, and the lower section is a reference to another section of the ultrasonic transducer. 2. The probe according to claim 1, that is, in that the horizontal drive of the turn comprises an electromagnet connected through a ratchet mechanism to a crank-connecting rod mechanism. 3. Probe on PP. 1 and 2, the difference is that with the fact that the vertical rotary mechanism contains a ball stop, a crank mechanism, a safety pin, a deflecting element and a deflection system to which the ultrasonic transducer is located, 4. The probe according to cl. 1, 2, 3, about tl and the fact that the system of deflecting t g is made in the form of a parallelogram. Sources of information taken in attention during examination 1, Ernst Nolte, Sound Measurements of Underground Void, Oil and Gas Journal, 1968. p. 76-78. 2. US patent No. 3683326, cl. G 01 V 1/13, 34O-15.5, 1972. 3. US patent No. 34255О7, cl. 181-5, G O1V 1/40, 1969. t at ta rs