CN114397088A - Device, system and method for detecting geological carbon dioxide sequestration state in real time - Google Patents
Device, system and method for detecting geological carbon dioxide sequestration state in real time Download PDFInfo
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Abstract
The invention belongs to the field of environmental monitoring, and particularly relates to real-time CO detection2Device, system and method for geological sequestration state, and aims to solve the problem of existing CO2The detection cost of the geological sequestration state detection technology is high, and the problems of the spatial distribution and the change of the resistance of the geological body with strong heterogeneity cannot be solved. The invention comprises the following steps: selecting a transmitting electrode and a receiving electrode, sending a detection current with a preset waveform from the transmitting electrode, receiving the detection current with loss by the receiving electrode to obtain an inter-electrode potential difference, traversing all possible combinations of the transmitting electrode and the receiving electrode to obtain a voltage data set of one direction, and further calculating the direction CO2State, the side of all directionsPosition CO2Combining states to obtain CO2The state is integrally distributed, and the CO of all the tested well positions is measured2Obtaining CO by combining state integral distribution2The distribution of the regions. The invention realizes large-scale real-time detection of CO by depicting the resistivity difference of the geologic body with high resolution2Geological sequestration state.
Description
Technical Field
The invention belongs to the field of environmental monitoring, and particularly relates to a device, a system and a method for detecting a geological sequestration state of carbon dioxide in real time.
Background
In recent years, CO is being developed in large quantities worldwide2Research on capture, utilization and sequestration of large amounts of CO captured in industrial processes2Injecting into rock stratum deep underground to permanently remove it from the atmosphere, thereby realizing global atmospheric CO2And (4) emission reduction target. Introducing CO2Injected into underground oil deposit, can not only improve the recovery ratio, but also realize the permanent storage of CO2The purpose of (1). Albeit CO2Geological sequestration techniques have matured, but there is increasing evidence to suggest that CO is present2The safety of geological sequestration is a technical bottleneck restricting the large-scale popularization and application of the geological sequestration. How to effectively prevent, monitor and control CO2Leakage, ensuring CO2Safety of sequestration, has become CO2An important content of the sealed technology research is receiving more and more attention.
CO2One of the security concerns of geological sequestration is the detection of CO2Plume movement and possible leakage. The CO which is the main stream at present2Monitoring techniques include time lapse seismic (also known as 4D seismic), repetitive electromagnetic surveying (4D EM/CSEM), microseismic, and GPS monitoring. Earthquakes have been identified as a high-cost, high-yield method, while 4D EM is considered to be a low-cost, high-yield CO2Monitoring techniques. In fact, direct observation of sequestered CO2The geologic body of (a) can acquire more and more reliable data, but drilling a large number of test wells is very costly and the problem of strong heterogeneity between wells in the geologic body has not been solved well.
Disclosure of Invention
In order to solve the problems in the prior art, namely the detection cost of the existing carbon dioxide geological sequestration state detection technology is high, the problems of spatial distribution and variation of resistance of a strong heterogeneous geologic body cannot be solved, and the detection precision in the vertical direction is low, the invention provides a device for detecting the carbon dioxide geological sequestration state in real time, and the device comprises multi-azimuth underground electrode equipment and ground detection equipment;
the multi-azimuth downhole electrode equipment comprises cables arranged outside the non-conductive sleeve and electrode arrays in the preset direction quantity;
each electrode array comprises a preset number of metal electrodes which are arranged in the same direction and are vertically inserted into the non-conductive tubes, and the metal electrodes are connected with the cables;
the ground monitoring equipment comprises a current source, a transmitting device, an underground telecommunication system detection module and a computer central control unit.
In some preferred embodiments, the metal electrode vertically inserted into the non-conductive tube disposed in the same orientation includes: and n metal electrodes which face the same direction and are equally spaced, wherein n is an even number.
In another aspect of the present invention, a system for detecting geological sequestration state of carbon dioxide in real time is provided, which includes: detection equipment installation module, voltage measurement module, resistance inversion module and CO2State evaluation module and CO2The device comprises a regional distribution evaluation module and a continuous real-time measurement module;
the detection equipment installation module is configured to grout the multi-azimuth downhole electrode equipment in a traditional oil field mode at a plurality of test well positions so that all cables and electrode arrays are buried in cement outside the casing;
arranging ground detection equipment at the ground position corresponding to each multidirectional underground electrode equipment, and connecting the ground detection equipment with the multidirectional underground electrode equipment;
the voltage measurement module is configured to select a transmitting electrode and a receiving electrode through ground detection equipment, send a detection current with a preset waveform from the transmitting electrode, receive the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, select another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combine all inter-electrode potential differences in one direction into a voltage data set in one direction;
the resistance inversion module is configured to acquire the voltage data set of one azimuth through ground monitoring equipment, and obtain a resistivity grid distribution image through inversion based on the voltage data set of one azimuth;
the CO is2A state evaluation module configured to calculate CO of an orientation from the resistivity grid distribution image2A distribution state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Combining distribution states to obtain CO2The overall distribution state of the single well;
the CO is2The regional distribution evaluation module is used for evaluating the single-well CO of all the tested well positions2CO production by combination of overall distribution states2The area distribution state;
the continuous real-time measurement module is configured as a repeated voltage measurement module, a resistance inversion module and CO2State evaluation module and CO2Function of regional distribution evaluation module to obtain CO2Regionally distributed real-time data and CO2Area distribution variation data.
In some preferred embodiments, the voltage measurement module includes a single electrode emission measurement mode, specifically:
selecting any metal electrode as a transmitting electrode, taking the rest n-1 electrodes as receiving electrodes, and recording the inter-electrode potential difference of each group of transmitting electrodes-receiving electrodes as a single electrode transmitting measurement potential difference;
and selecting another unselected metal electrode as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode and receiving electrode until all the metal electrodes are selected as the transmitting electrodes, and recording the single-electrode transmitting measurement potential difference.
In some preferred embodiments, the voltage measurement module further includes a symmetric electrode emission measurement mode, specifically:
selecting the length center of the non-conductive sleeve as a symmetry axis, and using metal electrodes with the same distance with the symmetry axis as a metal electrode pair;
selecting any metal electrode as a transmitting electrode pair, taking the rest n-2 electrodes as receiving electrodes, and recording the inter-electrode potential difference between each group of transmitting electrode pair and receiving electrodes as a symmetrical electrode transmitting measurement potential difference;
and selecting another unselected metal electrode pair as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode pair-receiving electrode until all the metal electrodes are selected as the transmitting electrode pair, and recording the transmitting measurement potential difference of the symmetrical electrodes.
In some preferred embodiments, the voltage measurement module further includes a remote detection mode, specifically:
selecting two electrodes A and B with preset intervals of k electrodes as high-voltage transmitting electrodes, wherein k is an even number;
selecting two electrodes C and D between the electrodes A and B as high-voltage emission electrodes, and A, B, C and D form a high-voltage emission electrode group;
transmitting high-voltage detection current through a high-voltage transmitting electrode, taking the rest n-4 electrodes as receiving electrodes, and recording the potential difference between each high-voltage transmitting electrode group and each receiving electrode as a remote detection potential difference;
and selecting unselected metal electrode combinations as high-voltage transmitting electrode groups, measuring the potential difference between the electrodes of each high-voltage transmitting electrode group and the receiving electrode until all possible high-voltage metal electrode combinations are selected, and recording the remote detection potential difference.
In some preferred embodiments, the voltage measurement module further includes a attenuation-reducing remote detection mode, specifically:
selecting two electrodes E and F with preset intervals of q electrodes as low-voltage transmitting electrodes, wherein q is an even number;
selecting two electrodes G and H between the electrodes E and F as high-voltage transmitting electrodes, and E, F, G and H as attenuation-reducing long-distance detection transmitting electrode groups;
transmitting low-voltage detection current through a low-voltage transmitting electrode, transmitting high-voltage detection current through a high-voltage transmitting electrode, wherein the potential difference between two receiving electrodes close to the low-voltage transmitting electrode between the high-voltage transmitting electrode and the low-voltage transmitting electrode is 0, the rest n-4 electrodes are used as receiving electrodes, and the potential difference between each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode is recorded and used as the attenuation-reducing long-distance detection potential difference;
and selecting unselected metal electrode combinations as attenuation-reducing long-distance detection transmitting electrode groups, measuring the potential difference between the electrodes of each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode until all possible metal electrode combinations are selected, and recording the potential difference to be attenuated long-distance detection.
In some preferred embodiments, the acquiring, by the ground monitoring device, the voltage dataset of the one orientation specifically includes:
connecting the metal electrodes to the transmitter and the downhole telecommunication system detection module by a multiplexer and a cable;
the transmitter is controlled to send out current with preset waveform through the computer central control and record the current received by the detection module of the underground telecommunication system, and further the potential difference between the electrodes is obtained.
In some preferred embodiments, the azimuthal CO is calculated from the resistivity solution distribution image2State, specifically, CO2In the supercritical region, the formation resistivity is increased by 5 times compared with that before oil displacement.
In some preferred embodiments, the sending of the detection current with the preset waveform from the transmitting electrode obtains the inter-electrode potential difference by receiving the detection current with the loss through the receiving electrode, specifically:
the frequency ω of the transmitted alternating current is, according to ohm's law:
V(ω)=I(ω)Z(ω)
where Z (ω) represents complex impedance, V (ω) represents voltage, and I (ω) represents current.
In a third aspect of the present invention, a method for real-time CO detection is provided2A method of geological sequestration of a state comprising:
s100, grouting multi-azimuth underground electrode equipment in a plurality of test well positions in a traditional oil field mode, burying all cables and electrode arrays in cement outside a sleeve, and connecting ground detection equipment with the multi-azimuth underground electrode equipment;
arranging ground detection equipment at the ground position corresponding to each piece of multidirectional underground electrode equipment;
step S200, selecting a transmitting electrode and a receiving electrode through ground detection equipment, sending a detection current with a preset waveform from the transmitting electrode, receiving the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, selecting another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combining all inter-electrode potential differences in one direction into a voltage data set in one direction;
step S300, acquiring the voltage data set of the one azimuth through ground monitoring equipment, and inverting the acquired resistivity grid distribution image based on the voltage data set of the one azimuth;
step S400, calculating CO of one direction according to the resistivity distribution image2A grid state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Grid state combination to obtain single well CO2The overall distribution state;
step S500, testing single well CO of all well positions2Obtaining CO by combining state integral distribution2Area distribution;
step S600, repeating the steps S200-S500 to obtain CO regional distribution real-time data and CO2Area distribution variation data.
In a fourth aspect of the present invention, an electronic device is provided, including: at least one processor; and a memory communicatively coupled to at least one of the processors; wherein the memory stores instructions executable by the processor for performing the method for detecting a carbon dioxide geological storage condition in real time as described above.
In a fifth aspect of the present invention, a computer-controlled readable storage medium is provided, where a computer-controlled instruction is stored in the computer-controlled readable storage medium, and the computer-controlled instruction is used for being executed by the computer to implement the above method for detecting the geological sequestration state of carbon dioxide in real time.
The invention has the beneficial effects that:
(1) the invention realizes large-scale real-time detection of CO by depicting the resistivity difference of the geologic body with high resolution2Geological sequestration state.
(2) The invention realizes the measurement of the resistance space distribution and the change of the strong heterogeneous geologic body by arranging the multi-azimuth electrode array and the ground monitoring equipment at the logging well position, thereby detecting CO2Plume and possible leakage conditions.
(3) The invention sets the transmitting electrode receiving electrode combination with multiple modes and sets a special detection method, and uses the inter-electrode potential difference measured in multiple modes for inverting CO2The distribution state can accurately reflect the change trend of the resistance in the vertical direction, the sudden change condition of the geological resistance can be accurately observed, and the leakage condition of the carbon dioxide can be timely found.
(4) According to the invention, by setting a special voltage detection mode and selecting the related electrodes to emit high-voltage detection current, the regional current between the related electrodes is prevented from being diffused and attenuated in an irrelevant direction, the detection range of the detection current is improved, and the CO can be observed in real time in a more comprehensive and wider range2Geological sequestration state to address the issue of spatial distribution and variation of electrical resistance of strongly heterogeneous geological bodies.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a functional block diagram of a system for real-time detection of carbon dioxide geological sequestration status in accordance with the present invention;
FIG. 2 is a schematic diagram of a ground detection device of the apparatus for real-time detection of the geological sequestration state of carbon dioxide in an embodiment of the present invention;
FIG. 3 is a schematic illustration of placement of a downhole electrode apparatus in a formation in an embodiment of the invention;
FIG. 4 is a schematic representation of a resistivity grid distribution image obtained by inversion of a voltage data set at one location in an embodiment of the invention;
FIG. 5 is a graph of a resistivity grid profile in an embodiment of the invention;
FIG. 6 is a single well CO in an embodiment of the present invention2The overall distribution state schematic diagram;
FIG. 7 is a single well CO in an embodiment of the present invention2Schematic distribution in the geology.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides a device for detecting the geological sequestration state of carbon dioxide in real time, which realizes the resistivity difference of a large-resolution and large-range carved geologic body and realizes the large-range and accurate real-time detection of CO2Geological sequestration state.
The device comprises multi-azimuth underground electrode equipment and ground detection equipment;
the multi-azimuth downhole electrode equipment comprises cables arranged outside the non-conductive sleeve and electrode arrays in the preset direction quantity;
each electrode array comprises a preset number of metal electrodes which are arranged in the same direction and are vertically inserted into the non-conductive tubes, and the metal electrodes are connected with the cables; the different electrode arrays are provided with metal electrodes at the same height;
the ground monitoring equipment comprises a current source, a transmitting device, an underground telecommunication system detection module and a computer central control unit.
Also provides a method for detecting CO in real time2Real-time detection of CO in a device for geological sequestration of conditions2A system for geological sequestration of conditions comprising: detection equipment installation module, voltage measurement module, resistance inversion module and CO2State evaluation module and CO2The device comprises a regional distribution evaluation module and a continuous real-time measurement module;
the detection equipment installation module is configured to grout the multi-azimuth downhole electrode equipment in a traditional oil field mode at a plurality of test well positions so that all cables and electrode arrays are buried in cement outside the casing;
arranging ground detection equipment at the ground position corresponding to each multidirectional underground electrode equipment, and connecting the ground detection equipment with the multidirectional underground electrode equipment;
the voltage measurement module is configured to select a transmitting electrode and a receiving electrode through ground detection equipment, send a detection current with a preset waveform from the transmitting electrode, receive the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, select another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combine all inter-electrode potential differences in one direction into a voltage data set in one direction;
the resistance inversion module is configured to acquire the voltage data set of one azimuth through ground monitoring equipment, and invert the acquired resistivity grid distribution image based on the voltage data set of one azimuth;
the CO is2A state evaluation module configured to calculate CO of an orientation from the resistivity grid distribution image2A distribution state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Obtaining single well CO by distribution state combination2The overall distribution state;
the CO is2The regional distribution evaluation module is used for evaluating the single-well CO of all the tested well positions2CO production by combination of overall distribution states2The area distribution state;
the continuous real-time measurement module is configured to repeat voltage measurementModule, resistance inversion module, CO2State evaluation module and CO2Function of regional distribution evaluation module to obtain CO2Regionally distributed real-time data and CO2Regional distribution variation data
In order to more clearly detect CO in real time by the invention2The system of geological sequestration state is explained, and the functional modules in the embodiment of the present invention are described in detail below with reference to fig. 1.
Real-time CO detection in accordance with a first embodiment of the invention2The system for geological sequestration of state comprises detection equipment installation module, voltage measurement module, resistance inversion module, and CO2State evaluation module and CO2The area distribution evaluation module comprises the following functional modules in detail:
the detection equipment installation module is configured to grout the multi-azimuth downhole electrode equipment in a traditional oil field mode at a plurality of test well positions so that all cables and electrode arrays are buried in cement outside the casing; the present embodiment utilizes ohm's law to calculate the voltage between any two electrodes to measure the formation resistivity. The underground components are mainly composed of metal electrodes and cables in non-conductive sleeves for connecting a surface current source and the detection module equipment of the underground telecommunication system, so that the underground components have reliable mechanical structure.
In the present embodiment, the number of azimuths may be set to any number of 4 azimuths, 8 azimuths, or 16 azimuths according to the detection accuracy requirement.
Arranging ground detection equipment at the ground position corresponding to each piece of multidirectional underground electrode equipment;
in this embodiment, the multi-azimuth downhole electrode apparatus comprises a cable mounted outside a non-conductive casing and an array of electrodes in a predetermined number of orientations;
each electrode array comprises a preset number of vertical metal electrodes arranged in the same direction;
in this embodiment, the vertical metal electrodes disposed in the same orientation include: n metal electrodes facing a uniform direction at equal intervals, n being an even number. In this embodiment, preferably 32 metal electrodes are provided per orientation, and in this embodiment, a downhole electrode apparatus is provided as shown in FIG. 3.
The ground monitoring equipment comprises a power supply, an emitting device, an underground telecommunication system detection module and a computer central control unit, wherein the power supply is connected with the emitting device, the emitting device is connected with an underground sensor detection module through a voltage emitting line and a voltage feedback line, the voltage feedback line is also connected with a potential measuring resistor, two ends of the potential measuring resistor are connected with an electric signal processing module, the electric signal processing module is simultaneously connected with the computer central control unit, the underground sensor detection module and the emitting device through a timer, and the underground sensor detection module is additionally and directly connected with the electric signal processing module.
The voltage measurement module is configured to select a transmitting electrode and a receiving electrode through ground monitoring equipment, send a detection current with a preset waveform from the transmitting electrode, and receive the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference; in this embodiment, in order to reduce the interference of electromagnetic induction in long cable (2 miles), it is preferable to use square wave current with frequency lower than 1hz as the detection current, and it is also possible to set the detection current with multiple frequencies or set the detection current with waveform superposition to increase the extra measurement required by signal-to-noise ratio;
in this embodiment, the detecting current with a preset waveform is sent from the transmitting electrode, the receiving electrode receives the lost detecting current to obtain the inter-electrode potential difference, and all inter-electrode potential differences in one direction are combined into a voltage data set in one direction:
the frequency ω of the transmitted alternating current is, according to ohm's law:
V(ω)=I(ω)Z(ω)
where Z (ω) represents complex impedance, V (ω) represents voltage, and I (ω) represents current.
In this embodiment, the voltage measurement module includes a single-electrode emission measurement mode, specifically:
selecting any metal electrode as a transmitting electrode, taking the rest n-1 electrodes as receiving electrodes, and recording the inter-electrode potential difference of each group of transmitting electrodes-receiving electrodes as a single electrode transmitting measurement potential difference;
and selecting another unselected metal electrode as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode and receiving electrode until all the metal electrodes are selected as the transmitting electrodes, and recording the single-electrode transmitting measurement potential difference. For example, electrode No. 1 is selected as the transmitting electrode, and at this time, electrodes No. 2 to 32 can receive the attenuated detection current, and electrodes No. 1 to 32 are all selected as the transmitting electrodes, and the potential difference is recorded. This step can obtain an accurate resistivity profile.
In this embodiment, the voltage measurement module further includes a symmetric electrode emission measurement mode, specifically:
selecting the length center of the non-conductive sleeve as a symmetry axis, and using metal electrodes with the same distance with the symmetry axis as a metal electrode pair;
selecting any metal electrode as a transmitting electrode pair, taking the rest n-2 electrodes as receiving electrodes, and recording the inter-electrode potential difference between each group of transmitting electrode pair and receiving electrodes as a symmetrical electrode transmitting measurement potential difference;
and selecting another unselected metal electrode pair as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode pair-receiving electrode until all the metal electrodes are selected as the transmitting electrode pair, and recording the transmitting measurement potential difference of the symmetrical electrodes. For example, the No. 16 electrode and the No. 17 electrode are selected as the transmitting electrodes, and the No. 1 to No. 15 electrodes and the No. 18 to No. 32 electrodes are selected as the receiving electrodes, and the potential differences of all combinations are recorded. The detection method of the step can obtain the resistivity distribution of the medium distance.
In this embodiment, the voltage measurement module further includes a remote detection mode, specifically:
selecting two electrodes A and B with preset intervals of k electrodes as high-voltage transmitting electrodes, wherein k is an even number;
selecting two electrodes C and D between the electrodes A and B as high-voltage emission electrodes, and A, B, C and D form a high-voltage emission electrode group;
transmitting high-voltage detection current through a high-voltage transmitting electrode, taking the rest n-4 electrodes as receiving electrodes, and recording the potential difference between each high-voltage transmitting electrode group and each receiving electrode as a remote detection potential difference;
and selecting unselected metal electrode combinations as high-voltage transmitting electrode groups, measuring the potential difference between the electrodes of each high-voltage transmitting electrode group and the receiving electrode until all possible high-voltage metal electrode combinations are selected, and recording the remote detection potential difference. For example, the 10 th electrode and the 20 th electrode are selected as high-voltage transmitting electrodes, the middle 15 th electrode and the middle 16 th electrode are also selected as high-voltage transmitting electrodes, the same potential as the 10 th electrode and the 20 th electrode is manufactured through the high-voltage transmitting electrodes, the transverse attenuation of the detection current of the middle 15 th high-voltage transmitting electrode and the middle 16 th high-voltage transmitting electrode is avoided, and the long-distance resistance distribution condition can be obtained. And adjusting various possible remote detection combinations to obtain remote resistance distribution conditions of various depths.
In this embodiment, the voltage measurement module further includes a attenuation reduction remote detection mode, specifically:
selecting two electrodes E and F with preset intervals of q electrodes as low-voltage transmitting electrodes, wherein q is an even number;
selecting two electrodes G and H between the electrodes E and F as high-voltage transmitting electrodes, and E, F, G and H as attenuation-reducing long-distance detection transmitting electrode groups;
transmitting low-voltage detection current through a low-voltage transmitting electrode, transmitting high-voltage detection current through a high-voltage transmitting electrode, wherein the potential difference between two receiving electrodes close to the low-voltage transmitting electrode between the high-voltage transmitting electrode and the low-voltage transmitting electrode is 0, the rest n-4 electrodes are used as receiving electrodes, and the potential difference between each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode is recorded and used as the attenuation-reducing long-distance detection potential difference;
and selecting unselected metal electrode combinations as attenuation-reducing long-distance detection transmitting electrode groups, measuring the potential difference between the electrodes of each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode until all possible metal electrode combinations are selected, and recording the potential difference to be attenuated long-distance detection. For example, the No. 15 electrode and the No. 16 electrode are selected as high-voltage transmitting electrodes, the No. 10 electrode and the No. 20 electrode are selected as low-voltage transmitting electrodes, and the potential difference between the No. 11 electrode and the No. 12 electrode and the No. 18 electrode and the No. 19 electrode is 0, so that the resistivity change at different depths can be accurately reflected while the remote resistance is obtained. Adjusting various possible remote detection combinations to obtain attenuation-reducing remote resistance distribution conditions of various depths
In this embodiment, the current injection electrodes and the voltage of all possible measurement combinations are linearly independent.
The resistance inversion module is configured to acquire the voltage data set of one azimuth through ground monitoring equipment, and obtain a resistivity distribution image through inversion based on the voltage data set of one azimuth;
in this embodiment, the acquiring, by the ground monitoring device, the voltage data set of the one azimuth specifically includes:
connecting the electrodes to the transmitter and the downhole telecommunication system detection module by a multiplexer;
the transmitter is controlled to send out current with preset waveform through the computer central control and record the current received by the detection module of the underground telecommunication system, and further the potential difference between the electrodes is obtained.
After the inter-electrode potential difference is obtained, only solutions with the desired characteristics may be considered, such as maximum smoothness, preferably the smoothness of the specified solution is anisotropic and smaller in the vertical direction, with CO2Expectation when the plume moves along more or less horizontal adjacent geological hydrological layers.
The resistance inversion module is configured to acquire the voltage data set of the one azimuth through ground monitoring equipment, and invert an acquired resistivity grid distribution image based on the voltage data set of the one azimuth, as shown in fig. 4;
the CO is2A state evaluation module configured to calculate CO of one orientation from the resistivity distribution image2A state; the presence of interwell plumes is easily detected, and any finer-scale structure of the plume with the electrical properties assumed here would be difficult to detect in the absence of much higher electrode spatial resolution. CO 22The resistivity is significantly increased after plume flow.
In this embodiment, the calculation of the azimuthal CO is performed based on the resistivity solution distribution image2State, specifically, CO2In the supercritical area, the formation resistivity is n times of the preset resistivity before oil displacement, and preferably n is 5.
Orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Obtaining single well CO by distribution state combination2The state is distributed as a whole, but the resistive grid distribution of the well is shown in FIG. 5, converting it to single well CO2The overall distribution of states is shown in FIG. 6;
the CO is2Regional distribution evaluation module, the CO2The regional distribution evaluation module is used for evaluating the single-well CO of all the tested well positions2Obtaining CO by combining state integral distribution2Area distribution;
the continuous real-time measurement module is configured as a repeated voltage measurement module, a resistance inversion module and CO2State evaluation module and CO2Function of regional distribution evaluation module to obtain CO2Regionally distributed real-time data and CO2Regional distribution variation data by CO2Change in difference reflects CO2If there is a leak, if CO is found2A rapid build-up occurs and a leak is considered to have occurred. CO detected by the invention2Comparison of good storage and leakage is shown in FIG. 7, where it can be seen that when CO is present2When the storage state is good, CO2Should be flowing in the formation, and not through the formation; when CO is present2The resistance in the horizontal direction at the time of leakage is significantly increased in a certain region but the range is narrowed, while the high resistance range in the vertical direction is increased; under the condition of good preservation, the resistance of the stratum has obvious stratum resistance boundary, and when the leakage condition exists, a high-resistance area penetrating through the original stratum resistance boundary appears, so that the improvement of the detection range of the carbon dioxide in the stratum and the improvement of the resistance detection precision in the vertical direction have important significance for observing the flowing condition of the carbon dioxide. Compared with the existing geological resistivity measurement method, the method has the advantages that the electrode array is arranged according to the azimuth, all potential differences which can be combined are obtained, and the method is wider in range and higher in precisionThe resistance distribution, further, because every equipment in pit all divide into different position and measure respectively, can reflect the resistance variation trend in the vertical direction and the horizontal direction of detection device position, can observe CO2The CO can be measured in different directions2The range change of the plume is measured in real time.
It should be noted that the above embodiments provide real-time CO detection2The system for geological sequestration of state is only illustrated by the division of the functional modules, and in practical applications, the above function allocation may be completed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present invention are further decomposed or combined, for example, the modules in the embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the above described functions. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
Real-time CO detection in accordance with a third embodiment of the present invention2The method for geological sequestration state comprises steps S100-S600, and the steps are described in detail as follows:
s100, grouting multi-azimuth underground electrode equipment in a plurality of test well positions in a traditional oil field mode to enable all cables and electrode arrays to be buried in cement outside a casing;
arranging ground detection equipment at the ground position corresponding to each multidirectional underground electrode equipment, and connecting the ground detection equipment with the multidirectional underground electrode equipment;
step S200, selecting a transmitting electrode and a receiving electrode through ground detection equipment, sending a detection current with a preset waveform from the transmitting electrode, receiving the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, selecting another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combining all inter-electrode potential differences in one direction into a voltage data set in one direction;
step S300, acquiring the voltage data set of the one azimuth through ground monitoring equipment, and inverting the acquired resistivity grid distribution image based on the voltage data set of the one azimuth;
step S400, calculating CO of one direction according to the resistivity distribution image2A distribution state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Obtaining single well CO by distribution state combination2The overall distribution state;
step S500, testing single well CO of all well positions2Obtaining CO by combining state integral distribution2Area distribution;
step S600, repeating the steps S200-S500 to obtain CO regional distribution real-time data and CO2Area distribution variation data.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
An electronic apparatus according to a fourth embodiment of the present invention includes: at least one processor; and a memory communicatively coupled to at least one of the processors; wherein the content of the first and second substances,
the memory stores instructions executable by the processor for execution by the processor to implement the real-time detection of CO described above2A method of geological sequestration of a condition.
A fourth embodiment of the present invention is a computer-controlled readable storage medium, in which computer-controlled instructions are stored, and the computer-controlled instructions are used for being controlled and executed by the computer to implement the above real-time CO detection2A method of geological sequestration of a condition.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The device for detecting the geological sequestration state of the carbon dioxide in real time is characterized by comprising multidirectional underground electrode equipment and ground detection equipment;
the multi-azimuth downhole electrode equipment comprises cables arranged outside the non-conductive sleeve and electrode arrays in the preset direction quantity;
each electrode array comprises a preset number of metal electrodes which are arranged in the same direction and are vertically inserted into the non-conductive tubes, and the metal electrodes are connected with the cables;
the ground monitoring equipment comprises a current source, a transmitting device, an underground telecommunication system detection module and a computer central control unit.
2. The apparatus for real-time detection of carbon dioxide geological storage according to claim 1, characterized in that said metal electrode vertically inserted into non-conductive pipe disposed in the same orientation comprises: and n metal electrodes which face the same direction and are equally spaced, wherein n is an even number.
3. A system for real-time detection of the geological sequestration of carbon dioxide, using the method of any of claims 1-2 for real-time detection of CO2Apparatus for geological sequestration of conditions, the system comprising: detection equipment installation module, voltage measurement module, resistance inversion module and CO2State evaluation module and CO2The device comprises a regional distribution evaluation module and a continuous real-time measurement module;
the detection equipment installation module is configured to grout the multi-azimuth downhole electrode equipment in a traditional oil field mode at a plurality of test well positions so that all cables and electrode arrays are buried in cement outside the casing;
arranging ground detection equipment at the ground position corresponding to each multidirectional underground electrode equipment, and connecting the ground detection equipment with the multidirectional underground electrode equipment;
the voltage measurement module is configured to select a transmitting electrode and a receiving electrode through ground detection equipment, send a detection current with a preset waveform from the transmitting electrode, receive the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, select another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combine all inter-electrode potential differences in one direction into a voltage data set in one direction; the resistance inversion module is configured to acquire the voltage data set of one azimuth through ground monitoring equipment, and invert the acquired resistivity grid distribution image based on the voltage data set of one azimuth;
the CO is2A state evaluation module configured to calculate CO of an orientation from the resistivity grid distribution image2A distribution state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Obtaining single well CO by distribution state combination2The overall distribution state;
the CO is2The regional distribution evaluation module is used for evaluating the single-well CO of all the tested well positions2CO production by combination of overall distribution states2The area distribution state;
the continuous real-time measurement module is configured to repeat powerPressure measurement module, resistance inversion module, CO2State evaluation module and CO2Function of regional distribution evaluation module to obtain CO2Regionally distributed real-time data and CO2Area distribution variation data.
4. The system for detecting the geological sequestration state of carbon dioxide in real time according to claim 3, characterized in that the voltage measurement module comprises a single electrode emission measurement mode, in particular:
selecting any metal electrode as a transmitting electrode, taking the rest n-1 electrodes as receiving electrodes, and recording the inter-electrode potential difference of each group of transmitting electrodes-receiving electrodes as a single electrode transmitting measurement potential difference;
and selecting another unselected metal electrode as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode and receiving electrode until all the metal electrodes are selected as the transmitting electrodes, and recording the single-electrode transmitting measurement potential difference.
5. The system for detecting the geological sequestration state of carbon dioxide in real time according to claim 4, wherein the voltage measurement module further comprises a symmetrical electrode emission measurement mode, specifically:
selecting the length center of the non-conductive sleeve as a symmetry axis, and using metal electrodes with the same distance with the symmetry axis as a metal electrode pair;
selecting any metal electrode as a transmitting electrode pair, taking the rest n-2 electrodes as receiving electrodes, and recording the inter-electrode potential difference between each group of transmitting electrode pair and receiving electrodes as a symmetrical electrode transmitting measurement potential difference;
and selecting another unselected metal electrode pair as a transmitting electrode, measuring the potential difference between the electrodes of each group of transmitting electrode pair-receiving electrode until all the metal electrodes are selected as the transmitting electrode pair, and recording the transmitting measurement potential difference of the symmetrical electrodes.
6. The system for detecting the geological sequestration state of carbon dioxide in real time according to claim 4, wherein the voltage measurement module further comprises a remote detection mode, in particular:
selecting two electrodes A and B with preset intervals of k electrodes as high-voltage transmitting electrodes, wherein k is an even number;
selecting two electrodes C and D between the electrodes A and B as high-voltage emission electrodes, and A, B, C and D form a high-voltage emission electrode group;
transmitting high-voltage detection current through a high-voltage transmitting electrode, taking the rest n-4 electrodes as receiving electrodes, and recording the potential difference between each high-voltage transmitting electrode group and each receiving electrode as a remote detection potential difference;
and selecting unselected metal electrode combinations as high-voltage transmitting electrode groups, measuring the potential difference between the electrodes of each high-voltage transmitting electrode group and the receiving electrode until all possible high-voltage metal electrode combinations are selected, and recording the remote detection potential difference.
7. The system for detecting the geological sequestration state of carbon dioxide in real time according to claim 4, wherein the voltage measurement module further comprises a attenuation-reducing remote detection mode, in particular:
selecting two electrodes E and F with preset intervals of q electrodes as low-voltage transmitting electrodes, wherein q is an even number;
selecting two electrodes G and H between the electrodes E and F as high-voltage transmitting electrodes, and E, F, G and H as attenuation-reducing long-distance detection transmitting electrode groups;
transmitting low-voltage detection current through a low-voltage transmitting electrode, transmitting high-voltage detection current through a high-voltage transmitting electrode, wherein the potential difference between two receiving electrodes close to the low-voltage transmitting electrode between the high-voltage transmitting electrode and the low-voltage transmitting electrode is 0, the rest n-4 electrodes are used as receiving electrodes, and the potential difference between each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode is recorded and used as the attenuation-reducing long-distance detection potential difference;
and selecting unselected metal electrode combinations as attenuation-reducing long-distance detection transmitting electrode groups, measuring the potential difference between the electrodes of each attenuation-reducing long-distance detection transmitting electrode group and the receiving electrode until all possible metal electrode combinations are selected, and recording the potential difference to be attenuated long-distance detection.
8. The system for detecting the geological storage status of carbon dioxide in real time as claimed in claim 3, wherein said acquiring the voltage data set of said one orientation by a ground monitoring device comprises:
connecting the metal electrodes to the transmitter and the downhole telecommunication system detection module by a multiplexer and a cable;
the transmitter is controlled to send out current with preset waveform through the computer central control and record the current received by the detection module of the underground telecommunication system, and further the potential difference between the electrodes is obtained.
9. The system for detecting the geological sequestration state of carbon dioxide in real time as claimed in claim 3, wherein the detection current with preset waveform sent from the transmitting electrode receives the lost detection current through the receiving electrode to obtain the inter-electrode potential difference, specifically:
the frequency ω of the transmitted alternating current is, according to ohm's law:
V(ω)＝I(ω)Z(ω)
where Z (ω) represents complex impedance, V (ω) represents voltage, and I (ω) represents current.
10. A method for detecting geological carbon dioxide sequestration in real time, which comprises the steps of using the device for detecting geological carbon dioxide sequestration in real time according to any one of claims 1-2, and the method comprises:
s100, grouting multi-azimuth underground electrode equipment in a plurality of test well positions in a traditional oil field mode to enable all cables and electrode arrays to be buried in cement outside a casing;
arranging ground detection equipment at the ground position corresponding to each multidirectional underground electrode equipment, and connecting the ground detection equipment with the multidirectional underground electrode equipment;
step S200, selecting a transmitting electrode and a receiving electrode through ground detection equipment, sending a detection current with a preset waveform from the transmitting electrode, receiving the detection current with loss through the receiving electrode to obtain an inter-electrode potential difference, selecting another transmitting electrode and another receiving electrode to combine and measure the inter-electrode potential difference, and combining all inter-electrode potential differences in one direction into a voltage data set in one direction; step S300, acquiring the voltage data set of the one azimuth through ground monitoring equipment, and inverting the acquired resistivity grid distribution image based on the voltage data set of the one azimuth;
step S400, calculating CO of one direction according to the resistivity distribution image2A distribution state;
orientation CO obtained by all orientation downhole electrode devices outside the same non-conductive casing2Obtaining single well CO by distribution state combination2The overall distribution state;
step S500, testing single well CO of all well positions2Obtaining CO by combining state integral distribution2Area distribution;
step S600, repeating the method from step S200 to step S500 to obtain CO2Regionally distributed real-time data and CO2Area distribution variation data.
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