RU2456643C2 - Device for carrying out logging in ore holes - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: device includes magnetic field sensors, orientation and magnetic susceptibility sensors, control unit and information processing system. At that, when using additional sensors and measuring units, it is possible to measure natural radioactivity, temperature, induced medium polarisation at eight electric field decrease time intervals and apparent resistance per lowering-hoisting operation using single-core cable and information transfer immediately to log recorder, which sufficiently cheapens the hole logging and shortens the time required for logging works.

EFFECT: improving efficiency of logging works.

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Description

The device relates to geophysics and is intended to determine the physical properties of rocks, fields and the spatial position of ore wells in one round trip. Comprehensive measurements are associated not only with cost savings, but also with the fact that when researching wells under permafrost or severe rock disturbance, measurements with two or three instruments are often simply impossible due to freezing or collapse of the well. In addition, the selection of the optimal set of methods for simultaneous measurements is of fundamental importance.

A device is known [1], which is used for logging in ore wells. The disadvantage of this device is that it is not intended to measure electrical parameters of rocks, temperature and natural radioactivity.

A device is known [2], which is used to conduct a complex of magnetic well surveys. The disadvantage of this device is the inability to measure electrical parameters of rocks, temperature and natural radioactivity. In addition, a three-wire logging cable is required and magnetic susceptibility is measured in a separate tripping operation.

The closest technical solution to the proposed invention is the equipment [3], containing in the downhole tool three mutually orthogonal rigidly mounted flux gates and a system of three accelerometers, a measuring magnetometer circuit, an analog-to-digital converter, a register, a control unit, and a magnetic susceptibility unit. The disadvantage of this device is that it is not intended for measuring temperature, natural radioactivity and electrical parameters of rocks and ores.

The objective of the new device is to measure a set of physical parameters, including magnetic susceptibility, inclinometry data, magnetic field components, apparent resistance, electric potential, apparent polarizability, natural radioactivity and temperature in one round trip operation. Using a device for logging will increase the efficiency of logging by measuring additional physical quantities in the wellbore. In addition, the use of a new device for conducting logging in ore wells will have a significant economic effect, due to the reduction in the time of measurements in the well.

A device for logging ore wells contains a block of three mutually orthogonal flux probes, a block of mutually orthogonal accelerometers, a block of magnetic susceptibility, a first, second, third switches, a magnetometer measuring circuit, a first integrating analog-to-digital converter, a shift register, a controlled output stage with modulator, a control unit, characterized in that it additionally includes a temperature sensor and a gamma-ray logging unit with a direct current output connected output from the inputs of the third switch, a four-electrode electric logging probe, a controlled amplifier, a three-stage pulse generator, a resistor, a fourth switch, a second fast analog-to-digital converter, a microcontroller, the three-stage pulse generator being connected through a resistor to two electrodes of the AB probe, the second two electrodes MN probes are connected through the fourth switch to the differential input of the controlled amplifier, the output of which is connected to the input of the second high-speed analog-digital converter, whose output is connected to the microcontroller and microcontroller control input connected to the output of the control unit, the microcontroller outputs connected to control inputs of the three-stage pulse generator, a fourth switch controlled amplifier, an analog-digital converter and controllable output stage.

Figure 1 presents a functional diagram of a device for logging in ore wells.

Figure 2 presents a timing diagram of a sequence of measuring channels of the device.

Figure 3 presents the plot of the voltages on the electrodes AB, M-N.

The device contains:

block of three mutually orthogonal fluxgates x, y, z - 1,

block of mutually orthogonal accelerometers U1, U2, U3 - 2,

magnetic susceptibility unit æ - 3,

the first switch is 4,

the second switch is 5,

the third switch is 6,

the measuring circuit of the magnetometer - 7,

low pass filter - 8,

analog-to-digital converter integrating type - 9,

shift register - 10,

controlled output stage with a modulator - 11,

modulating frequency generator - 12,

power supply - 13,

single-core armored cable - 14,

control unit - 15,

temperature sensor - 16,

gamma-ray logging unit with DC output - 17,

four-electrode electric logging probe - 18,

controlled amplifier - 19,

a three-stage voltage pulse generator - 20,

resistor - 21,

the fourth switch is 22,

high-speed analog-to-digital converter - 23,

microcontroller - 24.

The device works as follows: the device interacts with a digital logging logger, for example, “Volcano”. The borehole tool is connected to the logging register using a single-core logging cable 24, through which the supply voltage of the borehole tool is also supplied to block 16. The device works with time division of channels for 25 cycles with a duration of 40 · 10 ^-3 sec. The measurement cycle is 1 second. The received information is synchronized by a digital logging logger at the time of a pause in its transmission during a given time interval. In the first and second clock cycles of the device, the controlled output stage 13 does not transmit information signals to the wireline cable. In the third and twelfth clock, the voltage from the outputs of the measuring circuit of the magnetometer 8, the low-pass filter 9 and the analog outputs of the thermometer 4 and the gamma-ray logging unit with direct current output 5 are alternately connected to the input of the analog-to-digital converter 11 through the switch 10. Information is transmitted by register 12 to the controlled output stage and then the cable is carried out at the moments of the end of the corresponding cycle, which is noted in the diagram of figure 2, where U0 is the service constant, χ is the magnetic susceptibility, Z is the axial component of the vector of the geomagnetic field, U1, U2 and U3 are the projections of the gravity vector, X and Y are the horizontal components of the geomagnetic field vector orthogonal to Z, t is the temperature, γ is the intensity of natural gamma radiation, Ushunt is the voltage at a constant shunt of 50 Ohms in a current pulse between the electrodes A-B, Upr +, Upr- are the voltages on the electrodes MN at moments 15 and 55 ms after switching on the pulse on the electrodes AB.

After the end of the 12th cycle, a potential appears at the output of the control unit 15 (output a), which is fed to the control input of the microcontroller 23 (input b). In the thirteenth and fourteenth cycles, the block 23 includes a three-stage pulse generator 17, the output voltage of which is supplied to the electrodes AB of the probe 19. The voltage that is supplied to the switch 20 is removed from the electrodes M-N.

The duration of the transient process on the M-N electrodes characterizes the polarizability of the medium. The switch 20 connects to the inputs of the amplifier 21 the same voltage from the resistor 18, which is proportional to the current between the electrodes A and B. This voltage, as well as the voltage amplitude at the electrodes MN can vary over a very wide range, so the microcontroller 23 controls the gain of block 21. The output the voltage of the amplifier 21 is supplied to the input of the second fast analog-to-digital converter 22. The moments of switching on of the unit 22 after the arrival of the leading edge of the voltage pulse at the electrodes AB are shown in Table 1.

Table 1 No. one 2 3 four 5 6 7 8 9 T, ms fifteen 20.1 20,2 20.45 21 22 24.5 thirty 39 No. 10 eleven 12 13 fourteen fifteen 16 17 eighteen T, ms 55 60.1 60,2 60.45 61 62 64.5 70 79

The output codes of block 22 are received in the memory of the microcontroller, after which the necessary calculations are performed, a serial code is generated in the RS232C interface format and, at predetermined time intervals, this code is fed to the input of the controlled output stage 13 and then to cable 24.

Thus, the use of a device for logging in ore wells allows you to measure 21 physical parameters along the wellbore in a continuous mode.

Information sources

1. V.N. Ponomarev, Yu.G. Astrakhantsev, A.G. Gritchin and S.D. Sozontov. Integrated logging magnetometer. A.S. 911420, MKI G01V 3/18.

2. Magnetic exploration. Handbook of Geophysics / Ed. V.E. Nikitsky, Yu.S. Glebovsky - 2nd ed., Rev. and add. - M .: Nedra, 1990 .-- S. 238-243.

3. Yu. Astrakhantsev, N. Beloglazova. Hardware-software complex for continuous inclinometry of oil and gas wells. Instrumentation practice. The quarterly scientific-technical and production journal No. 1 of 2003, Yekaterinburg.

Claims (1)

A device for conducting ore well logging, comprising a block of three mutually orthogonal flux probes, a block of mutually orthogonal accelerometers, a magnetic susceptibility block, first, second, third switches, a magnetometer measuring circuit, a low-pass filter, an integrating analog-to-digital converter, a shift register, controlled output stage with modulator, modulating frequency generator, power supply, single-core armored cable, control unit, characterized in that it has additional a temperature sensor and a gamma-ray logging unit with a direct current output connected to the inputs of the third commutator, a four-electrode electric logging probe, a controlled amplifier, a three-stage pulse generator, a resistor, a fourth switch, a fast analog-to-digital converter, a microcontroller, and a three-stage pulse generator have been introduced connected through a resistor to two supply electrodes of the probe (AB), the second two receiving electrodes (MN) are connected through the fourth switch to the differential input a controlled amplifier, the output of which is connected to the microcontroller, and the control input of the microcontroller is connected to the output of the control unit, and the outputs of the microcontroller are connected to the control inputs of a three-stage pulse generator, a fourth switch, a controlled amplifier, an analog-to-digital converter, and a controlled cascade.

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