A device for determining cross-flows in the well

 

The invention relates to the oil and gas industry and can be used to determine the cross-flows in the borehole by measuring the magnitude of the heat flux of the inner surface of the borehole wall in a continuous non-contact mode. The device includes a sensor infrared (IR) radiation, the optical system, the modulator of the heat flux and the electronic stabilization of the rotation frequency of the modulator, the stabilizer temperature sensing element and electronics thermal management and thermal stabilization of the sensing element, the power amplification and signal conversion information, and registering the device on the surface. The stabilizer temperature sensitive element made in the form of a thermostat, which houses the sensor IR radiation and heat flux modulator, and is equipped with a heater and input window transparent to infrared radiation. thermostat shall establish and maintain the temperature at the upper limit of the measured value. The device allows to increase the accuracy of determining cross-flows. 2 Il.

The invention relates to the oil and gas industry, in particular to a device in order to determine thermal field wells includes sensor infrared (IR) radiation, the optical system, the modulator signal, the power amplification and signal conversion information, and registering the device on the surface (see and.with. The USSR 203587, IPC E 21 b 47/06).

The disadvantage of this device is that in the process of temperature measurement in the borehole information signal is formed as a response to differential temperature

T=Tob.-TMOD.-PM.E.

where Tob. the temperature of the measured object;

TMOD. - the temperature of the blades of the modulator;

PM.E. the temperature sensitive element.

The absence of thermal stabilization system, sensor infrared radiation and modulator results in an error proportional to the temperature change of the device that is inaccurate estimates of the measurement results.

The closest to the claimed device is a device for the study of thermal field wells, comprising a sensor infrared radiation optical system, the stabilizer temperature sensitive element, the power amplification and signal conversion information, and registering the device on the surface (see application No. 2001106294/03 from 2001.03.05). However, the operation of this device is time-consuming due to the use of liquid nitrogen, the operation prebase measurements and time-consuming.

The present invention solves the problem of determining the cross-flows in the borehole above the hydrostatic level by non-contact continuous measurement of infrared radiation from the surface of the borehole wall.

The technical result achieved by the invention is to reduce the time of operation of the measurement while reducing costs.

This object is achieved in that the device for determining the cross-flows in the well containing the sensor, the infrared radiation optical system, the stabilizer temperature sensitive element, the power amplification and signal conversion information, and registering the device on the surface, equipped with an additional heat flux modulator, electronic stabilization unit rotation frequency of the modulator, electronics thermal management and thermal stabilization of the sensing element, while the stabilizer temperature sensitive element made in the form of a thermostat, which houses the sensor IR radiation and heat flux modulator, and is equipped with a heater, input window transparent to infrared radiation, in thermostat establish and maintain the temperature at the upper limit of the first device, and Fig.2 which shows a thermogram obtained using the inventive device.

The inventive device comprises a geophysical cable 1, spuskaemogo device 2, the recording device located on the surface 3, the heater 4, the stabilizer temperature sensitive element 5, the control unit and the heat-set 6, the sensing element 7 sensor IR radiation 8, the modulator 9, the stabilization unit interrupt frequency IR radiation 10, the optical system 11, the input window of the stabilizer 12, the power amplification and conversion of the signal 13.

The device operates as follows.

Spuskaemogo device 2 connect the logging cable 1 with the recording device 3 located on the surface. When the power supply start to function blocks included in the device. In particular, the heater 4 stabilizer 5 using the unit thermal control and thermal stabilization 6 displays the temperature regulator 5 to the upper limit of the measured temperature, which provides a specified range of measured values. Located in the stabilizer sensitive element 7 sensor infrared radiation modulator 8 and 9 become the same temperature, which is maintained at a specified level in the universi significantly below the minimum resolvable temperature difference, defined by the claimed device. At the same time the stabilization unit interrupt frequency modulator 10 outputs a frequency modulator by a specified amount. Next, the measuring device is lowered into the borehole at a constant speed. IR radiation from the inner surface of the borehole passes through the optical system 11 of the device is interrupted by the modulator 9, passes through the input window 12 of the stabilizer 5 and reach the sensing element 7 sensor IR radiation 8. The sensing element 7 sensor IR radiation 8 converts the radiation into an electrical signal, which is transmitted to the input unit of the amplification and conversion of the signal 13, in this block, the analog signal is amplified and converted into a serial digital code. This code comes from a geophysical cable 1 to the registration device 3 located on the surface. In the recording device 3, it is processed according to a given program and displayed to the user in the form of a thermal image. The user thermograms in the presence of deviations thermograms from the standard geoterma judges the presence of the annular flow (see Fig.2), and when determining equality signal at different depths (points 1 and 2 in Fig.2) judge the location of the annular flow.

Pascalli descent device of 0.4 m/s to determine the position and length of the annular flow with a high degree of accuracy. When using the device for contactless measurement of cross-flows does not require pre-technological work on the preparation of wells for the measurement. The accuracy of the measurement is not affected by local surface defects well as their angular size is much smaller field of view of the device used, time of continuous operation of the device is not limited to its design features.

Claims

A device for determining cross-flows in the well containing the sensor of the infrared radiation optical system, the stabilizer temperature sensitive element, the power amplification and signal conversion information, and registering the device on the surface, characterized in that it is equipped with an additional heat flux modulator, electronic stabilization unit rotation frequency of the modulator, electronics thermal management and thermal stabilization of the sensing element, while the stabilizer temperature sensitive element made in the form of a thermostat, which houses a sensor of infrared radiation and heat flux modulator, and is equipped with a heater and input window transparent to infrared radiation, whereas the

 

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FIELD: well boring, particularly for measuring pressure in well during drilling thereof.

SUBSTANCE: device has body with central flushing orifice and grooves. Arranged in the grooves are electrical circuits and positive pressure transducers isolated by pressure-resistant shell. The first pressure transducer is connected with central flushing orifice in tube, another one - with annular tube space. The device is provided with power source and two differential amplifiers with outputs connected to summing unit inputs. Supply diagonal units are linked correspondingly with power source inputs. The first units of measuring diagonals of the first and the second pressure transducers are connected correspondingly with inverting and non-inverting inputs of the first differential amplifier. The second units of measuring diagonals of the first and the second pressure transducers are linked correspondingly to inverting and non-inverting inputs of the second differential amplifier. The first and the second pressure transducers may be arranged in the body at 0°-45° and 153°-180° angles to vertical device axis correspondingly or may be inversely arranged. The body may be formed of titanic alloy.

EFFECT: increased measuring reliability.

4 cl, 2 dwg

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