CN110793661A - Temperature measuring device and method for ultra-high temperature shaft - Google Patents
Temperature measuring device and method for ultra-high temperature shaft Download PDFInfo
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- CN110793661A CN110793661A CN201810874899.8A CN201810874899A CN110793661A CN 110793661 A CN110793661 A CN 110793661A CN 201810874899 A CN201810874899 A CN 201810874899A CN 110793661 A CN110793661 A CN 110793661A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
- G01K7/25—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
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Abstract
The invention provides a temperature measuring device and a temperature measuring method for an ultra-high temperature shaft, wherein the device is arranged on a cable winch on the well, and a multi-core cable is arranged on the cable winch; the pressure bearing cylinder is internally provided with a temperature sensor, and the temperature sensor is connected with one end of the multi-core cable through a conversion joint; a cable matching circuit module disposed on the well and connected to the other end of the multi-core cable, the cable matching circuit module being configured to: the equivalent resistance, the temperature sensor and the line formed by the multi-core cable form a balance bridge for measuring temperature; and the input end of the amplifying and storing display module is connected with the output end of the cable matching circuit module to realize signal amplification and display. The device can protect the circuit and the electronic components from being influenced by high temperature for a longer time, and has the advantages of simple integral structure and low measurement cost.
Description
Technical Field
The invention belongs to the technical field of underground high-temperature or ultrahigh-temperature measurement, and particularly relates to an overtemperature measurement device and method for an ultrahigh-temperature shaft, wherein the underground temperature exceeds 200 ℃ in the development process of hot dry rock, petroleum and natural gas, geothermal heat and the like.
Background
In the process of developing underground energy sources represented by dry hot rocks, the temperature of a shaft exceeds 230 ℃, and sometimes reaches even 300 ℃, and the higher the temperature is, the greater the significance of hot rock development is.
The existing method for measuring the shaft temperature generally integrates a measuring sensor, an acquisition circuit and a processing circuit on one or more instruments, and then quickly puts the whole instrument into a shaft to acquire various data. Because electronic components are greatly influenced by the working temperature, in the prior art, such as application number CN201710265056, the name of the invention is 'a high-temperature high-pressure digital geothermal logging system', and application number CN201710375593, the name of the invention is 'an active thermal management system and method for an underground instrument', the circuit system is firstly packaged into a vacuum flask, then is installed into the instrument, and is put into a shaft together to measure parameters of the shaft and the stratum. The advantage of this kind of scheme can solve the pyrometry of short time, and the thermos can protect the circuit not receive the influence of high temperature in the short time. However, this type of solution has the disadvantage of a very limited working time. The main reason is that when the vacuum flask works in a high-temperature environment, the external high temperature of the vacuum flask inevitably penetrates through the vacuum flask to enter an internal circuit system, and particularly when the underground temperature reaches or exceeds 200 ℃, the effective heat preservation time of the vacuum flask is rapidly reduced. After high-temperature permeation, many electronic components can not work normally and effectively, the effective working time is short, and the measurement precision is greatly influenced.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides a shaft temperature measuring device and method for high temperature, the device can protect a circuit and an electronic component from being influenced by high temperature for a longer time, and the device has a simple integral structure and low measuring cost.
To achieve the above object, in one aspect, the present invention provides a wellbore temperature measuring device for high temperature, comprising:
the cable winch is arranged on the well, and a multi-core cable is arranged on the cable winch;
the pressure bearing cylinder is internally provided with a temperature sensor, and the temperature sensor is connected with one end of the multi-core cable through a conversion joint;
a cable matching circuit module disposed on the well and connected to the other end of the multi-core cable, the cable matching circuit module being configured to: the equivalent resistance, the temperature sensor and the line formed by the multi-core cable form a balance bridge for measuring temperature; and
and the input end of the amplifying and storing display module is connected with the output end of the cable matching circuit module to realize signal amplification and display.
In the invention, only the ultrahigh temperature sensor is arranged in the pressure-bearing cylinder, the pressure-bearing cylinder is put into the well through the cable winch and the multi-core cable, and other electronic components such as the cable matching circuit module, the amplifying and storing display module and the like are arranged on the well, so that the pressure-bearing cylinder is not limited by the underground high temperature, the pressure-bearing cylinder can effectively work for a long time, and the integral structure is simpler, the probability of the electronic components being damaged by the high temperature is greatly reduced, and the integral measurement cost is greatly reduced. In one embodiment, the amplifying and storing display module includes a storage sub-module and a data processing sub-module in addition to the amplifying sub-module and the display sub-module, and the signal amplified by the amplifying sub-module is stored and processed by the data processing sub-module and then displayed on the display sub-module.
In one embodiment, the amplifying and storing display module comprises an amplifying submodule, a display submodule, a storage submodule and a data processing submodule, and after signals amplified by the amplifying submodule are stored and processed in the storage submodule and the data processing submodule, a temperature value and/or a temperature change diagram is displayed on the display submodule.
In one embodiment, the first equivalent resistor, the second equivalent resistor and the third equivalent resistor have equal resistance values, and the four signals form a full-bridge resistor network.
In one embodiment, the differential output terminals of the full-bridge resistor network are connected to the positive input terminal and the negative input terminal of the amplifier sub-module, respectively.
In one embodiment, both ends of the temperature sensor are connected to one of the cable cores of the multi-core cable through a crossover joint.
In one embodiment, the winch controller is connected to the cable winch and controls the depth of the multi-core cable penetrating into the shaft by controlling a driving motor of the cable winch.
The amplifying and storing display module comprises a storing and data processing submodule besides an amplifying submodule and a display submodule, and signals amplified by the amplifying submodule are stored and processed and then displayed on the display submodule.
In one embodiment, the cable matching circuit module comprises a first equivalent resistor, a second equivalent resistor and a third equivalent resistor, the multi-core cable is connected with the temperature sensor to form a first signal three-way equivalent resistor to form a four-way output signal, and the four-way output signal is formed as two input signals of an amplifying sub-module in the amplifying and storing display module.
In one embodiment, the first equivalent resistor, the second equivalent resistor and the third equivalent resistor have equal resistance values to form a full bridge resistor network.
In one embodiment, the differential output terminals of the full-bridge resistor network are formed to be connected to the positive and negative input terminals of the amplifier sub-module, respectively.
In one embodiment, two ends of the temperature sensor are respectively connected with a multi-core cable through adapter connectors.
In one embodiment, the winch controller controls the depth of the multi-conductor cable into the wellbore via the cable winch.
On the other hand, the invention also provides a shaft temperature measuring device and a method for high temperature,
in one embodiment, the method comprises the steps of:
measuring the temperature coefficient of the multi-core cable, selecting a matched equivalent resistor, constructing the equivalent resistor, the temperature sensor and the multi-core cable into a balanced bridge for measuring the temperature, and connecting all parts according to the device;
the pressure-bearing cylinder is lowered to the deep part of the shaft to be measured through a cable winch, and the temperature value and/or the temperature change diagram in the shaft are obtained through an amplifying and storing display module on the ground.
In one embodiment, determining the temperature coefficient of the multi-core cable comprises: and calibrating the cable core resistance value of the multi-core cable at zero degree, and calibrating the temperature coefficient of the cable core.
In one embodiment, the matched equivalent resistors are selected to form a full-bridge resistor network according to the sum of the resistance values of the two cable cores and the resistance value of the temperature sensor.
Compared with the prior art, the invention has the advantages that:
the temperature sensor is arranged in the pressure bearing cylinder, and two ends of the temperature sensor are respectively connected with the cable cores of the multi-core cable through the conversion joints to form one part of a full-bridge resistance network. And after measurement, selecting a proper equivalent resistance to form a balance bridge which can be measured. When the temperature in the shaft changes, the changed signals are input to the amplification submodule through the output end of the full-bridge resistance network, and the signals are amplified by the amplification submodule and then processed and displayed by the amplification and storage display module. The structure is simpler reliable, and spare part is small in quantity, because only temperature sensor and part multicore cable are located the pit shaft and bear the high temperature, the high temperature in the pit shaft does not have the influence to other electronic components or circuits, therefore is difficult for receiving high temperature or ultra-high temperature's influence, can effectively work longer time, has reduced measurement cost, has improved measurement accuracy.
In addition, the highest working temperature of the invention can exceed more than 500 ℃, thus the invention can meet the temperature measurement requirements of basically all wellholes at present and has wide application range.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic structural diagram of a temperature measuring device for an ultra-high temperature wellbore according to the present invention;
fig. 2 is a schematic circuit diagram of the temperature measuring device for the ultra-high temperature wellbore in fig. 1.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
The inventor notices in the invention process that the existing temperature measuring device used in the shaft is influenced by temperature, the effective working time is short, and the measuring precision is not high.
In view of the above disadvantages, embodiments of the present invention provide a temperature measuring device for an ultra-high temperature wellbore, which will be described in detail below.
Fig. 1 shows a schematic structural diagram of one embodiment of the temperature measuring device for the ultra-high temperature wellbore of the invention. In this embodiment, the temperature measuring device for an ultra-high temperature wellbore of the present invention mainly includes: a pressure-bearing cylinder 50, a temperature sensor 60, an adapter 40, a multi-core cable 30, a cable winch 10, a cable matching circuit module 70 and an amplifying and storing display module. One end of the multi-core cable 30 is connected to one end of the adapter 40, the other end of the adapter 40 is connected to the temperature sensor 60, and the temperature sensor 60 is installed in the pressure-bearing cylinder 50. And both ends of the temperature sensor 60 are respectively connected to different cable cores of the multi-core cable 30 through the crossover joints 40. The multi-core cable 30 is wound on the cable winch 10 located in the wellbore, and the depth of the pressure-bearing cylinder 50 connected to one end of the multi-core cable 30 in the wellbore can be controlled by the cable winch 10. The other end of the multi-core cable 30 is connected to the input end of the cable matching circuit module 70, the output end of the cable matching circuit module 70 is connected to the input end of the amplifier sub-module 80, and the output end of the amplifier sub-module 80 is connected to the intelligent terminal 90.
In a preferred embodiment, the intelligent terminal 90 mainly includes a display sub-module, a storage sub-module and a data processing sub-module. The signals amplified by the amplifying sub-module 80 are stored and processed in the storage sub-module and the data processing sub-module, and then the temperature value and/or the temperature change diagram are displayed on the display sub-module.
In one embodiment of the present invention, a winch controller 20 is attached to the wireline winch 10. The winch controller 20 controls the cable winch 10 to lower the multi-core cable 30 into the shaft together with the adapter 40, the pressure-bearing cylinder 50 and the temperature sensor 60, and the temperature in the shaft determines the resistance value of the temperature sensor 60. And the ground system calculates the temperature in the shaft by acquiring the change of the resistance value. The winch controller 20 can be lifted and lowered according to the needs of a user to complete temperature measurement at different well depth positions.
Fig. 2 is a schematic circuit diagram of the temperature measuring device for an ultra-high temperature wellbore according to the present invention, wherein:
the cable matching circuit module 70, the temperature sensor 60 and the multi-core cable 30 together form a full-bridge resistor network 100. The cable matching circuit module 70 mainly includes a first matching resistor 71, a second matching resistor 72 and a third matching resistor 73. The multi-core cable 30 is connected with the temperature sensor 60 to form a first signal, the first equivalent resistor 71, the second equivalent resistor 72 and the third equivalent resistor 73 are respectively formed into three output signals, and the four output signals are formed into two differential output signals of the full-bridge resistor network 100. The differential output of the full-bridge resistor network 100 is connected to the positive and negative inputs of the amplifier sub-module 80. The output of the amplifier sub-module 80 is connected to the input of the intelligent terminal 90. In one embodiment, as shown in FIG. 2, the first equivalent resistor 71, the second equivalent resistor 72 and the third equivalent resistor 73 have equal resistance values. The set values of the first equivalent resistor 71, the second equivalent resistor 72 and the third equivalent resistor 73 are the sum of the equivalent resistors 31 and 32 of the two cable cores and the equivalent resistor 61 of the temperature sensor under the condition of zero degree. The working principle of the full-bridge resistance network is similar to that of a resistance thermometer; the temperature measurement principle is to measure temperature or temperature-related parameters based on the characteristic that the resistance value of the equivalent resistance of the cable core changes along with the temperature change.
The resistance value of the equivalent resistance of the cable core changes along with the temperature, and the higher the temperature, the larger the resistance is, namely, the positive temperature coefficient of resistance is obtained.
It is noted that the output signal of the temperature sensor 60 is connected to the ground through the multi-core cable 30, and since the length of the multi-core cable 30 is very long compared to the wires of the ordinary circuit, the conventional multi-core cable 30 exceeds 3000 meters, and thus the distributed resistance of each core in the multi-core cable 30 has reached several tens of ohms to several hundreds of ohms. But also the electrical resistance of the cable core has a certain temperature coefficient, which increases with increasing temperature. Thus, it is not negligible.
In addition, the operating principle of the full-bridge resistor network 100 is similar to that of a resistance thermometer. The basic principle of the full-bridge resistor network 100 is to measure temperature or a parameter related to temperature based on the characteristic that the resistance value of the equivalent resistor of the cable core changes along with the change of temperature. And the resistance value of the equivalent resistance of the cable core changes along with the temperature, and the higher the temperature, the larger the resistance is, namely, the positive temperature coefficient of resistance is obtained.
The concrete formula is as follows:
Rt＝R*EXP(B*(1/T1-1/T2))
the above formula is explained as follows:
rt is the resistance value of the equivalent resistor at the temperature of T1;
r is the nominal resistance value of the equivalent resistor at the normal temperature of T2;
the value B is a related parameter of the equivalent resistance of the cable core;
EXP is the power of e to the n;
here, T1 and T2 refer to K degrees, kelvin, 273.15 (absolute temperature) + degrees celsius.
In one embodiment, as shown in fig. 2, the amplifier sub-module 80 is internally provided with an instrumentation amplifier 81 and an amplification setting resistor 82. The amplifier sub-module 80 includes a positive input terminal and a negative input terminal, and the differential output terminal of the full-bridge resistor network 100 is connected to the positive input terminal and the negative input terminal of the amplifier sub-module 80, respectively. In addition, when the full-bridge resistor network 100 is constructed, the test ensures that the differential output voltage of the full-bridge resistor network 100 is zero under the zero-degree condition, so that the input inherent deviation of the amplification sub-module 80 is eliminated. In addition, in one embodiment, the signals amplified by the amplification sub-module 80 are all temperature signals, which will significantly improve the acquisition accuracy.
In another aspect, the present invention provides a temperature measurement method for an ultra-high temperature wellbore, including the steps of:
under the condition of zero temperature, measuring the temperature coefficient of the multi-core cable 30, combining the equivalent resistance 61 of the temperature sensor 60, selecting the matched equivalent resistance, constructing the equivalent resistance, the temperature sensor 60 and the multi-core cable 30 into a balanced bridge for measuring the temperature, and connecting the pressure bearing cylinder 50, the temperature sensor 60, the adapter 40, the multi-core cable 30, the cable winch 10, the cable matching circuit module 70, the amplifying and storing display module and other parts according to the temperature measuring device for the ultra-high temperature shaft;
the pressure bearing cylinder 50 is lowered to the deep well to be measured in the shaft through a cable winch, and the temperature value and/or the temperature change diagram in the shaft are obtained through the amplifying and storing display module on the ground.
In a preferred embodiment, determining the temperature coefficient of the multi-core cable comprises: the cable core resistance value of the multi-core cable 30 is calibrated at zero degrees, and the temperature coefficient of the cable core is calibrated.
In a preferred embodiment, the full-bridge resistor network 100 is formed by selecting the matched equivalent resistors according to the sum of the resistance values of the two cable cores and the resistance value of the temperature sensor 60.
In embodiments of the invention, "high temperature" refers to high temperatures in the drilling regime, but generally not exceeding 200 ℃; "ultra high temperature" means a temperature in excess of 200 ℃ and in some special cases "ultra high temperature" means a temperature up to or exceeding 260 ℃. The device of the invention can test the temperature up to 500 ℃ under the condition of selecting a proper temperature sensor 60 and a proper multi-core cable 30. It is understood that although the present invention mainly refers to the temperature measurement under the condition of "ultra high temperature", it is obviously applicable to the temperature measurement condition of 200 ℃ and below.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A temperature measurement device for an ultra-high temperature wellbore, comprising:
the cable winch is arranged on the well, and a multi-core cable is arranged on the cable winch;
the pressure bearing cylinder is internally provided with a temperature sensor, and the temperature sensor is connected with one end of the multi-core cable through a conversion joint;
a cable matching circuit module disposed on the well and connected to the other end of the multi-core cable, the cable matching circuit module being configured to: the equivalent resistance, the temperature sensor and the line formed by the multi-core cable form a balance bridge for measuring temperature; and
and the input end of the amplifying and storing display module is connected with the output end of the cable matching circuit module to realize signal amplification and display.
2. The device according to claim 1, wherein the amplifying and storing display module comprises an amplifying submodule, a display submodule, a storage submodule and a data processing submodule, and after signals amplified by the amplifying submodule are stored and processed in the storage submodule and the data processing submodule, the temperature value and/or the temperature change graph is displayed on the display submodule.
3. The apparatus of claim 1 or 2, wherein the cable matching circuit module comprises a first equivalent resistor, a second equivalent resistor and a third equivalent resistor, the multi-core cable is connected with the temperature sensor to form a first signal, the first equivalent resistor, the second equivalent resistor and the third equivalent resistor form a three-way output signal, and the four-way output signal forms two input signals in the amplifying and storing display module.
4. The apparatus of claim 3, wherein the first, second and third equivalent resistors have equal resistance values, and the four signals form a full bridge resistor network.
5. The apparatus of claim 4, wherein the differential output terminals of the full-bridge resistor network are connected to the positive input terminal and the negative input terminal of the amplifier sub-module, respectively.
6. The device according to any one of claims 1 to 5, wherein both ends of the temperature sensor are connected to one of the cable cores of a multi-core cable by means of a crossover joint.
7. The apparatus as claimed in any one of claims 1 to 6, wherein a winch controller is connected to the cable winch, and the winch controller controls the depth of the multicore cable into the wellbore by controlling a driving motor of the cable winch.
8. A method of measuring temperature for an ultra high temperature wellbore, the method comprising the steps of:
determining the temperature coefficient of the multi-core cable and selecting a matched equivalent resistance, configuring the equivalent resistance with the temperature sensor and the multi-core cable as a balanced bridge for measuring temperature, and connecting the parts according to the device of any one of claims 1 to 7;
the pressure-bearing cylinder is lowered to the deep part of the shaft to be measured through a cable winch, and the temperature value and/or the temperature change diagram in the shaft are obtained through an amplifying and storing display module on the ground.
9. The method of claim 8, wherein determining the temperature coefficient of the multi-core cable comprises: and calibrating the cable core resistance value of the multi-core cable at zero degree, and calibrating the temperature coefficient of the cable core.
10. The method of claim 9, wherein the matched equivalent resistors are selected to form a full bridge resistor network according to the sum of the resistance values of the two cable cores and the resistance value of the temperature sensor.
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| CN201810874899.8A CN110793661B (en) | 2018-08-01 | 2018-08-01 | Temperature measuring device and method for ultra-high temperature shaft |
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| CN202081887U (en) * | 2011-05-26 | 2011-12-21 | 河南省科学院同位素研究所有限责任公司 | Continuous temperature and pressure monitoring system for steam injection soaking well |
| CN206174954U (en) * | 2016-08-29 | 2017-05-17 | 中国地质调查局水文地质环境地质调查中心 | A distributed temperature test system for doing hot dry rock deep well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4811598A (en) * | 1987-08-28 | 1989-03-14 | Chevron Research Company | Downhole temperature measurements |
| CN2727395Y (en) * | 2004-05-28 | 2005-09-21 | 徐凌堂 | High temperature high pressure optical waveguide well logging system |
| CN101614598A (en) * | 2008-06-27 | 2009-12-30 | 新奥科技发展有限公司 | A kind of thermocouple assembly that is used for measuring underground gasification temperature |
| CN102206995A (en) * | 2011-05-26 | 2011-10-05 | 河南省科学院同位素研究所有限责任公司 | System for continuously monitoring temperature and pressure during steam injection and soaking process |
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