SU672589A1 - Device for well noise-logging - Google Patents

Description

The invention relates to engineering and geological research, in particular, to Yap devices for conducting noise logging, in order to detect the places of overflows from upper aquifers to the lower ones in the pipeline area of the drilling well. A device is known for conducting a carrot in the process of drilling through the transmission of an acoustic signal through a column of flushing fluid containing a mechanical oscillation into electrical power transducer located in an airtight box and connected through an installer to the recorder 11. The disadvantage of this device is that the causative agent is acoustic the signal is at a considerable distance from the receiver. This leads to a significant attenuation of ultrasound in the washing liquid column and, consequently, to a decrease in the sensitivity and accuracy of the device. A probe dp of ultrasonic logging of boreholes is also known, in which between a JexKHX Möhani converter oscillating into an electrical signal and incomparable probe elements an acoustic isolator of finely porous elastic material 2 is installed. The disadvantage of this device is relatively low accuracy, in particular location of water flows from one layer to another in the e-pipe space of the well due to its high sensitivity to interference. The purpose of the invention is to improve the accuracy of the device for conducting noise logging in a borehole. This goal is achieved due to the fact that an inertial element, an elastic suspension and a conductor are inserted into a device for conducting noise logging in a borehole, containing its mechanical oscillation transducer into an electrical signal located in a sealed enclosure and connected through an amplifier to the recorder. an inertial element is rigidly connected to the transducer and, through an elastic hanger, to the device body rigidly connected to the sump. Figure 1 schematically shows the proposed device; FIG. 2 shows the sensitive element of the converter of mechanical oscillations into an electric signal.

A device for performing well logging in a beech well contains (Fig. 1) a mechanical oscillation into an electrical signal converter 1, an inertial element 2, Kojpnyc 3, a conduit 5 rigidly connected with kppWcoM, an elastic suspension 5, an amplifier and a recorder 7.

The inertial element 2 is connected to the cylindrical body 3 via an elastic suspension 5, with which the inertial element is hung out and the sensor element is oriented. 8 transducer 1 on the direction of maximum sensitivity. The sensing element 8 (FIG. 2) is a piezoelectric plate located on the console 9 elastically connected with the ring 10, which is clamped between the two parts of the inertial element 2. The inertial element is connected via a probe to the sump 4, which when lowered into the well concerns forming the inner surface of the pipe.

The sound duct 4 served as the Pyroegd Chy 1 ″ khanichesky oscillations of the borehole pipe walls to the sensing element 8, the Mass of the inertial element 2 is chosen, based on the spectral components of the gums, in order to filter out noise that is not typical for the borehole noise (motor noise of the lift engine, ground vibrations and others).

The device works as follows. ;

In order to carry out the noise carcass in the drilling unit, the body 3 is lowered into its barrel with the mechanical oscillations into electrical signals transducer 1. In this case, the pipe 4 slides along the inner surface of the Squigina pipe.

After a predetermined pitch equal to, for example, 1 m, the body 3 with the transducer 1 and the sound duct 4 is fixed and the noise level is measured. Noise oscillations of the pipe walls of the borehole are transmitted through the acoustic pipe 4 to the inertial element 2, inside of which the transducer 1 of mechanical oscillations into an electrical signal is located. When this occurs, electrical charges are generated on the edges of the piezoelectric, astinas of the sensing element 8, which are removed from the surfaces and plates with the help of metallized plates and along the line

transmit to the amplifier 6, located on the surface. After amplification and conversion, the electrical signal is recorded by the recorder 7. The recorded signal is proportional to

5 noise level in the well at the point of contact of the Zvukovaya 4 with the walls of the pipe squa.zhiny. In places of overflow of water from one layer to another due to the occurrence of turbulence

Water Q The noise level rises dramatically. - The accuracy of detecting the place of overflow of water is determined by the step of lowering the hull into the well (up to fractions of a meter).

Claims (2)

1. For France of France No. 2307120, cl. 5 B 47/12, 1976. 2. USSR author's certificate No. 545948, class C 01 V 1/40, 1977. IL (Rig. 2.