CN105840183B - Underground temperature and pressure parameter measuring circuit and measuring method thereof - Google Patents
Underground temperature and pressure parameter measuring circuit and measuring method thereof Download PDFInfo
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- CN105840183B CN105840183B CN201610293652.8A CN201610293652A CN105840183B CN 105840183 B CN105840183 B CN 105840183B CN 201610293652 A CN201610293652 A CN 201610293652A CN 105840183 B CN105840183 B CN 105840183B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides a downhole temperature and pressure parameter measuring circuit and a measuring method thereof, and the downhole temperature and pressure parameter measuring circuit comprises a signal acquisition circuit, a signal conditioning circuit, a control circuit, a computer and a direct-current power supply, wherein the output end of the signal acquisition circuit is connected with the signal conditioning circuit, the output end of the signal conditioning circuit is connected with the control circuit, the control circuit is bidirectionally connected with the computer, and the signal acquisition circuit, the signal conditioning circuit and the control circuit are all powered by the direct-current power supply. Has the beneficial effects that: the underground temperature and pressure parameter measuring circuit and the measuring method thereof can meet the measuring requirements of temperature and pressure signals at different stages in the petroleum drilling process, and can reduce power consumption, prolong the service life of the measuring circuit and improve the working stability while ensuring the measuring precision through dormancy setting and sampling interval setting under severe working conditions of underground high temperature, high pressure, vibration and the like.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas drilling, and particularly relates to a downhole temperature and pressure parameter measuring circuit and a measuring method thereof.
Background
In the exploration and development process of an oil-gas field, measurement of temperature and pressure information of a stratum is an important means for correctly evaluating oil-gas equivalent of a mineral reservoir stratum and ensuring safety and high efficiency of a drilling process, and is also an important basis for evaluating a fracturing construction effect and researching a fracturing process mechanism in a well completion fracturing process. The intelligent drilling tool with electromechanical integrated structure has different requirements on the pressure resistance, sealing performance, stability of an electronic control unit and service life of the tool due to the change of bottom hole temperature and pressure in the drilling process.
Because the shaft bottom has severe working conditions such as high temperature, high pressure, vibration and the like, the temperature and pressure measuring device works underground for a long time, and the measuring precision and the service life of the temperature and pressure measuring device are influenced. At present, temperature and pressure measuring equipment on the market are various in types, performance parameters are different, and the conditions that the measuring precision cannot meet requirements and even work fails can be caused due to improper type selection in the use process.
Therefore, the research on a circuit structure and a measurement control method for measuring bottom temperature and pressure parameters in the field of petroleum drilling has important significance in meeting the measurement requirements and ensuring the working stability of the circuit structure and the measurement control method.
Disclosure of Invention
In view of the above, the present invention provides a downhole temperature and pressure parameter measuring circuit, so as to solve the problem that the performance parameters of the existing temperature and pressure measuring devices in the market are different, and the measurement precision cannot meet the requirement or even fails when the downhole temperature and pressure measuring devices are used at the bottom of a well.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a circuit for measuring underground temperature and pressure parameters and a measuring method thereof comprise a signal acquisition circuit, a signal conditioning circuit, a control circuit, a computer and a direct current power supply, wherein the signal acquisition circuit comprises a temperature sensor and a pressure sensor, the signal conditioning circuit comprises a temperature signal conditioning circuit and a pressure signal conditioning circuit, the control circuit comprises a microprocessor and a storage circuit, a monitoring circuit, a clock circuit and a communication circuit which are respectively connected with the microprocessor, the temperature sensor is connected with the microprocessor after passing through the temperature signal conditioning circuit, the pressure sensor is connected with the microprocessor after passing through the pressure signal conditioning circuit, the microprocessor is also connected with the computer, and the signal acquisition circuit, the signal conditioning circuit and the control circuit are all powered by the direct current power supply.
Furthermore, the model of the temperature sensor is AD590, and the temperature measurement range is-45-150 ℃.
Furthermore, the pressure sensor is a sputtering film type pressure sensor, and the pressure measurement range is 0 MPa-100 MPa.
Further, the temperature signal conditioning circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier U1, an operational amplifier U2, and an operational amplifier U3, a second end of the resistor R2 is grounded, a first end of the resistor R2 is connected to a second end of the resistor R1, a first end of the resistor R1 is connected to a positive output terminal of the temperature sensor and a first end of the operational amplifier U1, a second end of the operational amplifier U1 is connected to a third end of the operational amplifier U1, a third end of the operational amplifier U1 is connected to a first end of the resistor R6 through the resistor R5, a second end of the resistor R6 is grounded, a first end of the resistor R6 is connected to a first end of the operational amplifier U3, and a third end of the operational amplifier U3 is an output terminal of the temperature signal conditioning circuit, the third end of the operational amplifier U3 is connected to the second end of the resistor R8, the first end of the resistor R8 is connected to the second end of the operational amplifier U3, the second end of the operational amplifier U3 is connected to the second end of the resistor R7, the first end of the resistor R7 is connected to the third end of the operational amplifier U2, the third end of the operational amplifier U2 is connected to the first end of the operational amplifier U2, the second end of the operational amplifier U2 is connected to the second end of the resistor R3, the first end of the resistor R3 is connected to a dc power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is grounded, the resistors R2 and the resistor R4 are adjustable resistors, the models 2902 and 2902D of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3 are preferably selected, and the models 2902 of the operational amplifier U1 are preferably selected The first ends of the operational amplifier U2 and the operational amplifier U3 are non-inverting input ends, the second ends are inverting input ends, and the third ends are output ends.
Further, the pressure signal conditioning circuit includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, an operational amplifier U4 and an operational amplifier U5, a positive output terminal of the pressure sensor is connected to a first terminal of the resistor R11, a second terminal of the resistor R11 is respectively connected to a first terminal of the operational amplifier U4 and a first terminal of the resistor R12, a second terminal of the resistor R12 is grounded, a negative output terminal of the pressure sensor is connected to a first terminal of the resistor R9, a second terminal of the resistor R9 is respectively connected to a second terminal of the operational amplifier U4 and a first terminal of the resistor R10, a second terminal of the resistor R10 is connected to a third terminal of the operational amplifier U4, a first terminal of the operational amplifier U4 is connected to a first terminal of the resistor R13, a second terminal of the resistor R13 is connected to a second terminal of the capacitor C1, the second end of the capacitor C1 is grounded, the first end of the resistor R13 is connected with the first end of the resistor R14, the second end of the resistor R14 is connected with the first end of the capacitor C2, the second end of the capacitor C2 is connected with the first end of the operational amplifier U5, the second end of the operational amplifier U5 is connected with the first end of the capacitor C1, the third end of the operational amplifier U5 is the output end of the pressure signal conditioning circuit, the operational amplifier U4 preferably selects AD8552, the operational amplifier U5 preferably selects LM2902D, the first ends of the operational amplifier U4 and the operational amplifier U5 are non-inverting input ends, the second ends are inverting input ends, and the third ends are output ends.
Further, the microprocessor is a model HCS12 series single chip microcomputer.
Furthermore, the direct-current power supply selects a high-temperature lithium battery as a stabilized voltage power supply.
Compared with the prior art, the downhole temperature and pressure parameter measuring circuit has the following advantages:
(1) the underground temperature and pressure parameter measuring circuit can meet the measuring requirements of temperature and pressure signals at different stages in the petroleum drilling process.
The invention also aims to provide a measuring method of the underground temperature and pressure parameter measuring circuit, which aims to solve the problems of electricity waste and high power consumption when the underground temperature and pressure parameter measuring circuit is in a working state for a long time under severe working conditions of underground high temperature, high pressure, vibration and the like.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a measurement method of a downhole temperature and pressure parameter measurement circuit comprises the following steps executed in sequence:
step 111: initializing a system, and finishing the zero clearing and resetting operations of the control circuit;
step 112: clock synchronization, which realizes the synchronization of the computer clock and the clock signal of the control circuit;
step 113: setting parameters, namely setting sampling intervals and data transmission types according to the requirements of drilling on the density of sampling data at different stages, wherein the data transmission types comprise transmission mode selection and whether real-time data transmission is needed, and the transmission direction is from the computer to the control circuit;
step 114: sampling temperature and pressure signals;
step 115: signal conditioning and data storage, wherein temperature and pressure signals obtained by sampling are filtered and amplified and then are sent to the microprocessor for further processing, and the processed data are stored in the storage circuit;
step 116: judging data transmission, if real-time data transmission is needed, turning to step 117, otherwise, turning to step 119;
step 117: data are transmitted in real time, and the data transmission mode is a wireless data transmission mode and comprises a mud pulse wireless data transmission mode, a sound wave data transmission mode, an electromagnetic wave data transmission mode and the like;
step 118: stopping collecting and judging, if the temperature and pressure measurement data meet the analysis and decision requirements, stopping sampling, otherwise, turning to step 114;
step 119: if no real-time data transmission is required in step 116, a stop acquisition determination is made. If the temperature and pressure information needs to be continuously sampled, go to step 114;
step 120: if the data is not required to be transmitted in real time in step 116, transmitting the measurement data to the computer after the sampling is finished;
step 121: and (4) sleeping and awaiting, after the measurement is finished, the downhole temperature and pressure parameter measuring circuit enters a sleeping state to wait for awakening of a new round of command, and if a new acquisition command exists, repeating the steps 113 to 121.
Compared with the prior art, the measuring method of the underground temperature and pressure parameter measuring circuit has the following advantages:
(1) according to the measuring method of the underground temperature and pressure parameter measuring circuit, through the dormancy setting and the sampling interval setting, under the severe working conditions of underground high temperature, high pressure, vibration and the like, the power consumption can be reduced while the measuring precision is ensured, the service life of the measuring circuit is prolonged, and the working stability is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a block diagram of a downhole temperature and pressure parameter measurement circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a temperature signal conditioning circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pressure signal conditioning circuit according to an embodiment of the present invention;
fig. 4 is a flowchart of a measuring method of a downhole temperature and pressure parameter measuring circuit according to an embodiment of the present invention.
Description of the reference numerals:
100-a signal acquisition circuit; 1001-temperature sensor; 1002-a pressure sensor; 200-a signal conditioning circuit; 2001-temperature signal conditioning circuit; 2002-pressure signal conditioning circuitry; 300-a control circuit; 3001-a microprocessor; 3002-memory circuitry; 3003-a monitoring circuit; 3004-a clock circuit; 3005-a communication circuit; 400-a computer; 500-direct current power supply.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A downhole temperature and pressure parameter measuring circuit and a measuring method thereof are disclosed as figures 1 to 4, comprising a signal collecting circuit 100, a signal conditioning circuit 200, a control circuit 300, a computer 400 and a direct current power supply 500, wherein the signal collecting circuit 100 comprises a temperature sensor 1001 and a pressure sensor 1002, the signal conditioning circuit 200 comprises a temperature signal conditioning circuit 2001 and a pressure signal conditioning circuit 2002, the control circuit 300 comprises a microprocessor 3001 and a storage circuit 3002, a monitoring circuit 3003, a clock circuit 3004 and a communication circuit 3005 which are respectively connected with the microprocessor 3001, the temperature sensor 1001 is connected with the microprocessor 3001 through the temperature signal conditioning circuit 2001, the pressure sensor 1002 is connected with the microprocessor 3001 through the pressure signal conditioning circuit 2002, the microprocessor 3001 is further connected with the computer 400, the signal collecting circuit 100, The signal conditioning circuit 200 and the control circuit 300 are both powered by the dc power supply 500.
The model of the temperature sensor 1001 is AD590, the temperature measuring range is-45-150 ℃, the pressure sensor 1002 is a sputtering film type pressure sensor, and the pressure measuring range is 0-100 Mpa.
The temperature signal conditioning circuit 2001 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3, a second end of the resistor R2 is grounded, a first end of the resistor R2 is connected to a second end of the resistor R1 for converting a current signal output by the temperature sensor AD590 into a voltage signal, wherein the second resistor R2 is a variable resistor for eliminating a scale factor error of the temperature sensor AD590, a first end of the resistor R1 is connected to a positive output terminal of the temperature sensor 1001 and a first end of the operational amplifier U1, a second end of the operational amplifier U1 is connected to a third end of the operational amplifier U1, a third end of the operational amplifier U1 is connected to a first end of the resistor R5 for isolating an input voltage and an output voltage, filtering interference at the output end of the temperature sensor 1001, wherein a second end of the resistor R5 is connected with a first end of the resistor R6, a second end of the resistor R6 is grounded, a first end of the resistor R6 is connected with a first end of the operational amplifier U3, a third end of the operational amplifier U3 is the output end of the temperature signal conditioning circuit 2001, a third end of the operational amplifier U3 is connected with a second end of the resistor R8, a first end of the resistor R8 is connected with a second end of the operational amplifier U3, a second end of the operational amplifier U3 is connected with a second end of the resistor R7, a first end of the resistor R7 is connected with a third end of the operational amplifier U2 for isolating input and output voltages and filtering interference at the output end of the temperature sensor 1001, a third end of the operational amplifier U2 is connected with a first end of the operational amplifier U2, the second end of the operational amplifier U2 is connected to the second end of the resistor R3, the first end of the resistor R3 is connected to a dc power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to ground, the resistor R2 and the resistor R4 are both adjustable resistors, the models of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3 are all preferably LM2902D, the first ends of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3 are both non-inverting inputs, the second end is an inverting input, and the third end is an output end, where the relationship among the resistor R5, the resistor R6, the resistor R7 and the resistor R8 is:
R6/R5＝R8/R7 (1)
because the temperature sensor in the signal acquisition circuit 100 is an AD590 temperature sensor, the output current value IKCorresponding to the thermodynamic temperature (unit: K), it needs to be converted into the temperature I in the temperature signal conditioning circuit 2001sThe unit is in DEG C, and the conversion relation between the two is as follows:
IK＝273+Is (2)
output voltage VTAnd AD590 output current IsThe relationship between them is:
the value of the resistor R2 is fixed, and the value of the resistor R4 is adjusted so that the voltage value V output by the temperature signal conditioning circuit 2001 is equal to 0 DEG CTIs 0V.
The pressure signal conditioning circuit 2002 comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, an operational amplifier U4 and an operational amplifier U5, wherein a positive output end of the pressure sensor 1002 is connected with a first end of the resistor R11, a second end of the resistor R11 is respectively connected with a first end of the operational amplifier U4 and a first end of the resistor R12, a second end of the resistor R12 is grounded, a negative output end of the pressure sensor 1002 is connected with a first end of the resistor R9, a second end of the resistor R9 is respectively connected with a second end of the operational amplifier U4 and a first end of the resistor R10, a second end of the resistor R10 is connected with a third end of the operational amplifier U4, a first end of the operational amplifier U4 is connected with a first end of the resistor R13, a second end of the resistor R13 is connected with a second end of the capacitor C1, the second end of the capacitor C1 is grounded, the first end of the resistor R13 is connected to the first end of the resistor R14, the second end of the resistor R14 is connected to the first end of the capacitor C2, the second end of the capacitor C2 is connected to the first end of the operational amplifier U5, the second end of the operational amplifier U5 is connected to the first end of the capacitor C1, the third end of the operational amplifier U5 is the output end of the pressure signal conditioning circuit 2002, the operational amplifier U4 is preferably AD8552, the operational amplifier U5 is preferably LM2902D, the first ends of the operational amplifier U4 and the operational amplifier U5 are both non-inverting input ends, the second ends are both inverting input ends, and the third ends are both output ends, wherein the capacitor C1 and the capacitor C2 are used for filtering out ac components carried by a preceding stage output.
The microprocessor 3001 is a model HCS12 series single chip microcomputer, and the dc power supply 500 uses a high temperature lithium battery as a regulated power supply.
The method comprises the following steps which are executed in sequence:
step 111: initializing a system, and finishing the zero clearing and resetting operations of the control circuit 300;
step 112: clock synchronization, which realizes the synchronization of the computer 400 clock and the control circuit 300 clock signal;
step 113: setting parameters, namely setting sampling intervals and data transmission types according to the requirements of drilling on the density of sampling data at different stages, wherein the data transmission types comprise transmission mode selection and whether real-time data transmission is needed, and the transmission direction is from the computer 400 to the control circuit 300;
step 114: sampling temperature and pressure signals;
step 115: signal conditioning and data storage, wherein temperature and pressure signals obtained by sampling are filtered and amplified and then sent to the microprocessor 3001 for further processing, and the processed data are stored in the storage circuit 3002;
step 116: judging data transmission, if real-time data transmission is needed, turning to step 117, otherwise, turning to step 119;
step 117: data are transmitted in real time, and the data transmission mode is a wireless data transmission mode and comprises a mud pulse wireless data transmission mode, a sound wave data transmission mode, an electromagnetic wave data transmission mode and the like;
step 118: stopping collecting and judging, if the temperature and pressure measurement data meet the analysis and decision requirements, stopping sampling, otherwise, turning to step 114;
step 119: if no real-time data transmission is required in step 116, a stop acquisition determination is made. If the temperature and pressure information needs to be continuously sampled, go to step 114;
step 120: if the data real-time transmission is not needed in step 116, transmitting the measurement data to the computer 400 after the sampling is finished;
step 121: and (4) sleeping and awaiting, after the measurement is finished, the downhole temperature and pressure parameter measuring circuit enters a sleeping state to wait for awakening of a new round of command, and if a new acquisition command exists, repeating the steps 113 to 121.
The working process of the downhole temperature and pressure parameter measuring circuit is as follows:
a temperature sensor 1001 and a pressure sensor 1002 in the signal acquisition circuit 100 measure temperature and pressure information at the bottom of a well;
the signal conditioning circuit 200 includes a temperature signal conditioning circuit 2001 and a pressure signal conditioning circuit 2002, and is configured to filter, amplify, and correct the temperature and pressure parameter signals measured by the signal acquisition circuit 100;
the control circuit 300 includes a microprocessor 3001, a storage circuit 3002, a monitoring circuit 3003, a clock circuit 3004 and a communication circuit 3005, the microprocessor 3001 selects an HCS12 series single chip microcomputer, an analog-to-digital conversion input port in the signal conditioning circuit is connected with an output end of the signal conditioning circuit 200 and used for further processing temperature and pressure signals output by the signal conditioning circuit 200, processed data are sent to a storage circuit 3002 to be stored, a monitoring circuit 3003 is used for monitoring the working state of a microprocessor 3001 in real time, once abnormity occurs, the power is automatically turned on and reset, a clock circuit 3004 is used for clock synchronization and providing time parameters during data storage, a communication circuit 3005 is used for data communication between the microprocessor 3001 and the computer 400 and receiving instructions transmitted by the computer 400, and the data transmission mode can adopt wireless transmission modes of drilling fluid mud, electromagnetic waves, sound waves and the like; the direct current power supply 500 is used for providing stable direct current electric energy for the underground temperature and pressure parameter measuring circuit, and a high-temperature lithium battery is selected as a stabilized voltage power supply.
The working process of the measuring method of the downhole temperature and pressure parameter measuring circuit is as follows:
firstly, system initialization and clock synchronization operation are carried out, sampling intervals are set according to the requirements of sampling data density at different drilling stages, temperature and pressure information of the well bottom is measured by a temperature sensor 1001 and a pressure sensor 1002 in a signal acquisition circuit 100, temperature and pressure signals obtained by measurement are filtered, amplified and corrected by a signal conditioning circuit 200 and then are sent to a microprocessor 3001 in a control circuit 300, the microprocessor 3001 further processes the signals obtained by sampling and then outputs the signals to a storage circuit 3002 for storage and data transmission as required, and after the temperature and pressure signals are acquired, the circuit for measuring the downhole temperature and pressure parameters is in a dormant state to wait for a new command.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A downhole temperature and pressure parameter measuring circuit is characterized in that: including signal acquisition circuit (100), signal conditioning circuit (200), control circuit (300), computer (400) and DC power supply (500), signal acquisition circuit (100) includes temperature sensor (1001) and pressure sensor (1002), signal conditioning circuit (200) includes temperature signal conditioning circuit (2001) and pressure signal conditioning circuit (2002), control circuit (300) includes microprocessor (3001) and memory circuit (3002), monitoring circuit (3003), clock circuit (3004) and communication circuit (3005) that connect respectively, temperature sensor (1001) are through connect microprocessor (3001) behind temperature signal conditioning circuit (2001), pressure sensor (1002) are through connect behind pressure signal conditioning circuit (2002) microprocessor (3001), microprocessor (3001) still with computer (400) is connected, the signal acquisition circuit (100), the signal conditioning circuit (200) and the control circuit (300) are all powered by the direct current power supply (500),
the temperature signal conditioning circuit (2001) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier U1, an operational amplifier U2 and an operational amplifier U3, wherein the second end of the resistor R2 is grounded, the first end of the resistor R2 is connected with the second end of the resistor R1, the first end of the resistor R1 is respectively connected with the positive output end of the temperature sensor (1001) and the first end of the operational amplifier U1, the second end of the operational amplifier U1 is connected with the third end of the operational amplifier U1, the third end of the operational amplifier U1 is connected with the first end of the resistor R6 through the resistor R5, the second end of the resistor R6 is grounded, the first end of the resistor R6 is connected with the first end of the operational amplifier U3, and the third end of the operational amplifier U3 is the temperature signal conditioning circuit (57), the third end of the operational amplifier U3 is connected to the second end of the resistor R8, the first end of the resistor R8 is connected to the second end of the operational amplifier U3, the second end of the operational amplifier U3 is connected to the second end of the resistor R7, the first end of the resistor R7 is connected to the third end of the operational amplifier U2, the third end of the operational amplifier U2 is connected to the first end of the operational amplifier U2, the second end of the operational amplifier U2 is connected to the second end of the resistor R3, the first end of the resistor R3 is connected to a dc power supply, the second end of the resistor R3 is connected to the first end of the resistor R4, and the second end of the resistor R4 is grounded,
the resistor R2 and the resistor R4 are both adjustable resistors, LM2902D is preferably selected as the models of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3, the first ends of the operational amplifier U1, the operational amplifier U2 and the operational amplifier U3 are both non-inverting input ends, the second ends are both inverting input ends, and the third ends are both output ends;
the pressure signal conditioning circuit (2002) comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, an operational amplifier U4 and an operational amplifier U5,
a positive output end of the pressure sensor (1002) is connected to a first end of the resistor R11, a second end of the resistor R11 is connected to a first end of the operational amplifier U4 and a first end of the resistor R12, a second end of the resistor R12 is grounded, a negative output end of the pressure sensor (1002) is connected to a first end of the resistor R9, a second end of the resistor R9 is connected to a second end of the operational amplifier U4 and a first end of the resistor R10, a second end of the resistor R10 is connected to a third end of the operational amplifier U4, a third end of the operational amplifier U4 is connected to a first end of the resistor R13, a second end of the resistor R13 is connected to a first end of the capacitor C1, a second end of the capacitor C1 is grounded, a first end of the resistor R13 is connected to a first end of the resistor R14, and a second end of the resistor R14 is connected to a first end of the capacitor C2, the second end of the capacitor C2 is connected with the first end of the operational amplifier U5, the second end of the operational amplifier U5 is connected with the first end of the capacitor C1, the third end of the operational amplifier U5 is the output end of the pressure signal conditioning circuit (2002),
the operational amplifier U4 preferably uses AD8552, the operational amplifier U5 preferably uses LM2902D, and the operational amplifier U4 and the operational amplifier U5 both have a first end that is a non-inverting input end, a second end that is an inverting input end, and a third end that is an output end.
2. A downhole temperature and pressure parameter measuring circuit according to claim 1, wherein: the model of the temperature sensor (1001) is AD590, and the temperature measurement range is-45-150 ℃.
3. A downhole temperature and pressure parameter measuring circuit according to claim 1, wherein: the pressure sensor (1002) is a sputtering film type pressure sensor, and the pressure measurement range is 0-100 Mpa.
4. A downhole temperature and pressure parameter measuring circuit according to claim 1, wherein: the microprocessor (3001) is a model HCS12 series single chip microcomputer.
5. A downhole temperature and pressure parameter measuring circuit according to claim 1, wherein: the direct current power supply (500) adopts a high-temperature lithium battery as a stabilized voltage power supply.
6. A measuring method of a downhole temperature and pressure parameter measuring circuit according to any one of claims 1 to 5, characterized by: the method comprises the following steps which are executed in sequence:
step 111: initializing a system, and finishing the zero clearing and resetting operations of the control circuit (300);
step 112: clock synchronization, which realizes the synchronization of the computer (400) clock and the control circuit (300) clock signal;
step 113: setting parameters, namely setting sampling intervals and data transmission types according to the requirements of drilling on the density of sampling data at different stages, wherein the data transmission types comprise transmission mode selection and whether real-time data transmission is needed, and the transmission direction is from the computer (400) to the control circuit (300);
step 114: sampling temperature and pressure signals;
step 115: signal conditioning and data storage, wherein temperature and pressure signals obtained by sampling are filtered and amplified and then sent to the microprocessor (3001) for further processing, and the processed data are stored in the storage circuit (3002);
step 116: judging data transmission, if real-time data transmission is needed, turning to step 117, otherwise, turning to step 119;
step 117: data are transmitted in real time, and the data transmission mode is a wireless data transmission mode and comprises a mud pulse wireless data transmission mode, a sound wave data transmission mode and an electromagnetic wave data transmission mode;
step 118: stopping collecting and judging, if the temperature and pressure measurement data meet the analysis and decision requirements, stopping sampling, otherwise, turning to step 114;
step 119: if the data real-time transmission is not needed in step 116, stopping the acquisition and judgment; if the temperature and pressure information needs to be continuously sampled, go to step 114;
step 120: if the data is not required to be transmitted in real time in the step 116, transmitting the measurement data to the computer (400) after the sampling is finished;
step 121: and (3) sleeping and awaiting, after the measurement is finished, the downhole temperature and pressure parameter measuring circuit enters a sleeping state to wait for the awakening of a new round of command, and if a new acquisition command exists, repeating the steps from 113 to 121.
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| CN108952687B (en) * | 2018-07-24 | 2021-09-07 | 中国石油集团渤海钻探工程有限公司 | Self-adaptive storage type electronic pressure gauge and measuring method |
| CN110111555A (en) * | 2019-05-17 | 2019-08-09 | 天津大学 | Underground working parameter telemetering wireless transmitting system |
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| CN101507665A (en) * | 2009-03-20 | 2009-08-19 | 吉林大学 | Intelligent artificial limbs system capable of sensing cold-hot and touch-slide feel |
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| CN104991204A (en) * | 2015-07-17 | 2015-10-21 | 中国石油集团渤海钻探工程有限公司 | A multi-channel signal acquisition circuit for downhole power system parameter measurement |
| CN105201488A (en) * | 2015-10-08 | 2015-12-30 | 中国石油集团渤海钻探工程有限公司 | Memory-type down-hole electronic pressure gauge with ultra-low power dissipation |
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