CN115655606A - Oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system and method - Google Patents
Oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system and method Download PDFInfo
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Abstract
The invention relates to the technical field of environment monitoring of petroleum pollution areas, in particular to a system and a method for monitoring three-dimensional resistivity among oil storage area multi-channel parallel acquisition wells. The power supply, the host, the multi-channel parallel acquisition device and the quadrupole AM-BN acquisition device are sequentially connected; the multichannel parallel acquisition device comprises a multichannel electrode conversion box, wherein a plurality of potential channel sockets are arranged in the multichannel electrode conversion box, the number of the potential channel sockets is the same as that of probes, twenty-four potential channels are arranged in each potential channel socket, each channel is internally provided with a relay and a current channel switch in a corresponding mode, one end of each relay is connected with a corresponding electrode on the resistivity probe, and the other end of each relay is connected with an acquisition module. The oil storage area leakage monitoring system is high in acquisition efficiency, can better realize leakage real-time monitoring, is high in monitoring precision, can accurately identify tiny leakage occurring in an oil storage area, and realizes remote in-situ monitoring of leakage in an oil pollution area.
Description
Technical Field
The invention relates to the technical field of environment monitoring of petroleum pollution areas, in particular to a system and a method for monitoring three-dimensional resistivity among oil storage area multi-channel parallel acquisition wells.
Background
Petroleum products are LNAPLs which have the widest harm range at present, and a gas station built in early stage of China has the problem of leakage gradually along with aging of a tank body and a pipeline, and becomes the most serious pollution source of soil and underground water pollution.
The current methods for monitoring leakage of oil storage facilities mainly include sensor monitoring, automatic tank metering, liquid level monitoring, vacuum pressure monitoring, double-layer bottom plate monitoring and the like. The sensor monitoring system monitors oil gas leaked from the oil storage tank through a liquid or gas sensor arranged in a tank field monitoring well, an oil collecting tank or a double-layer gap of the oil tank, and the method can only perform early warning when the oil gas leaks to a certain degree generally, so that the real-time performance is poor. The automatic metering technology of the storage tank, the liquid level monitoring technology, the vacuum pressure monitoring technology, the double-layer bottom plate monitoring and the like are all monitored by increasing monitoring equipment in the irrigation tank through transforming the storage tank, the real-time monitoring can be carried out on the storage tank, and the defect that a leak point cannot be positioned still exists. In order to realize the purpose of real-time monitoring, the existing oil storage facility monitoring technology must modify an oil storage facility or a tank body to adapt to technical requirements, even the tank body adapted to the oil storage facility or the tank body needs to be completely replaced, so that the cost is very high, the oil storage facility monitoring technology is not popularized on a large scale, a leakage area cannot be positioned, and the detection sensitivity for micro-leakage conditions is not high.
The resistivity chromatographic technique is a combined measuring method of multi-device and multi-polar distance, and depends on computer automatic processing, and the geophysical method is sensitive to underground medium change, can obtain continuous information about underground medium attribute in real time, realizes real-time monitoring of leakage of oil storage facilities, and can three-dimensionally analyze the evolution process of oil pollution areas. The interwell resistivity chromatography technology lays electrode systems in wells in the form of probes, greatly reduces ground interference, and improves the accuracy of underground resistivity data.
In the invention patent application with the application number of 201810737744.X and the name of 'method for monitoring underground leakage of an oil storage area in real time', the real-time monitoring step comprises the steps of establishing a monitoring area at the position extending by 1-3 meters around the oil storage area, and dividing the whole annular monitoring area into n rectangular sub-areas with equal area and distributed in single row and column; at the vertices of n rectangular subregionsSetting (2n + 2) resistivity probes; when the resistivity is measured, the electrodes of each probe are sequentially powered, all the electrodes of adjacent probes are simultaneously used for potential measurement, and the resistivity distribution among the probes is obtained after inversion imaging; measuring initial resistivity to obtain background resistivity value between probes, and comparing the resistivity value with the background value at each moment 1 From I 1 The location of leaks within the region and the direction of diffusion of the oil substance can be determined.
Although this earlier application patent has realized petroleum pollution district real-time supervision, still there is certain defect yet: firstly, a multi-channel parallel acquisition mode is not adopted, the acquisition efficiency is not high, and the data real-time performance is poor; and secondly, a dipolar acquisition device is adopted, so that the data volume is small, the spatial resolution is low, the monitoring precision is poor, and the requirement of monitoring the tiny leakage of the oil storage facility in real time cannot be well met.
In view of this, it is necessary to develop a real-time monitoring device capable of improving monitoring efficiency and precision, so as to provide technical support for monitoring leakage pollution in an oil pollution area.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for monitoring three-dimensional resistivity among wells by multi-channel parallel acquisition in an oil storage area.
The technical scheme of the invention is as follows: a three-dimensional resistivity monitoring system among oil storage area multichannel parallel acquisition wells comprises a power supply, a host, a multichannel parallel acquisition device, a quadrupole AM-BN acquisition device and a data terminal, wherein the power supply, the host, the multichannel parallel acquisition device and the quadrupole AM-BN acquisition device are sequentially connected;
the multichannel parallel acquisition device comprises a multichannel electrode conversion box, wherein a plurality of potential channel sockets are arranged in the multichannel electrode conversion box, the number of the potential channel sockets is the same as that of probes, twenty-four potential channels are arranged in each potential channel socket, a relay and a current channel switch are correspondingly arranged in each channel, one end of each relay is connected with a corresponding electrode on the resistivity probe, and the other end of each relay is connected with an acquisition module;
the quadrupole AM-BN acquisition device comprises a plurality of resistivity probes, and the resistivity probes are respectively positioned in the parallel acquisition wells;
the quadrupole AM-BN acquisition device further comprises a power supply electrode A, a power supply electrode B, a measuring electrode M and a measuring electrode N, wherein the power supply electrode A and the measuring electrode M are located on the same resistivity probe, the power supply electrode B and the measuring electrode N are located on the other resistivity probe, the power supply electrode A and the measuring electrode M are distributed at equal intervals with the power supply electrode B and the measuring electrode N, AM = BN = na, wherein a is the polar distance of the probe electrodes, N =1,2,3, 8230, 823023.
In the invention, the host comprises an acquisition module and a data wireless transmission module, wherein the acquisition module comprises an operational amplification circuit for amplifying signals, a band-pass filter for separating and denoising the signals, a pre-conditioning circuit consisting of a potential adjusting circuit and a digital-to-analog conversion circuit for converting analog signals into digital signals.
Resistivity probe includes inner tube, electrode slice and sleeve pipe, and the bottom welded fastening of inner tube has the taper stainless steel head of penetrating usefulness, and the outside of inner tube is equipped with the sleeve pipe, just sets up the several electrode slice along the even interval of axial of inner tube between inner tube and the sleeve pipe, and the electrode slice passes through the wire respectively to be connected with the relay that corresponds, all is equipped with twenty four electrode slices on every resistivity probe in this embodiment, still fills in the clearance between inner tube and the sleeve pipe has epoxy.
The quadrupole AM-BN collection device comprises four resistivity probes.
The invention also comprises a method for monitoring the resistivity by using the oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system, wherein the method comprises the following steps:
s1, a power supply supplies power to a host, an acquisition module of the host sends a control instruction, and a multi-channel parallel acquisition device controls the on-off of electrodes on a resistivity probe and manages the working state of each electrode on the probe;
s2, acquiring a potential value by using a multi-channel parallel acquisition device:
s2.1, a power supply electrode A and a measuring electrode M are positioned on a No. 1 resistivity probe, a power supply electrode B and a measuring electrode N are positioned on a No. 2 resistivity probe, and at the moment, 24i electrode channels in the multi-channel electrode conversion box are all opened;
s2.1.1 fixing a power supply electrode A and a measuring electrode M, wherein the power supply electrode A is located on an electrode plate at the top of a No. 1 resistivity probe, AM = a is adopted, the power supply electrode B and the measuring electrode N are sequentially moved from top to bottom, in the moving process, the power supply electrode B and the measuring electrode N are always kept at equal intervals, BN = a is adopted, and in the moving process, potential values of the measuring electrode N and the measuring electrode M are respectively acquired, so that the potential difference between the two measuring electrodes is obtained;
s2.1.2, expanding electrode distances between a power supply electrode A and a measuring electrode M and between a power supply electrode B and a measuring electrode N by one time, wherein AM = BN =2a, the power supply electrode A is still positioned at an electrode plate at the top of a No. 1 probe resistivity needle, fixing the power supply electrode A and the measuring electrode M, sequentially moving the power supply electrode B and the measuring electrode N from top to bottom, and respectively collecting potential differences of the measuring electrode N and the measuring electrode M in the moving process;
s2.1.3, continuously enlarging the electrode distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N, and repeating the data acquisition process until the distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N reach the maximum, wherein AM = BN =23a, and in the process, the power supply electrode A is kept at the electrode plate on the top of the resistivity probe No. 1 all the time;
s2.1.4, when AM = BN =23a, changing the position of the power supply electrode A, keeping the position of the power supply electrode A unchanged after the power supply electrode A moves downwards along the No. 1 resistivity probe by an electrode distance, and repeating the steps S2.1.1 to S2.1.3;
when AM = BN =22a, changing the position of the power supply electrode A again, enabling the power supply electrode A to move downwards along the resistivity probe No. 1 in sequence, keeping the position of the power supply electrode A unchanged, repeating the steps S2.1.1 to S2.1.3 until AM = BN = a, and finishing the potential value collection of the resistivity probe No. 2;
s2.1.5, sequentially transferring the power supply electrode B and the measuring electrode N to a No. 3 resistivity probe and a No. 4 resistivity probe, repeating the steps S2.1.1 to S2.1.4, and sequentially completing data measurement and acquisition of the No. 3 resistivity probe and the No. 4 resistivity probe;
s2.2, transferring the power supply electrode A and the measuring electrode M to the resistivity probe No. 2, starting seventy-two potential channels from the resistivity probe No. 2 to the resistivity probe No. 4, enabling the power supply electrode B and the measuring electrode N to be sequentially positioned on the resistivity probe No. 3 and the resistivity probe No. 4, and repeating the step S2.1;
s2.3, sequentially transferring the power supply electrode A and the measuring electrode M to the resistivity probe No. 3, enabling the power supply electrode B and the measuring electrode B to be located on the resistivity probe No. 4, starting forty-eight potential channels of the resistivity probe No. 3 and the resistivity probe No. 4, and repeating the step S2.1;
and S3, the acquisition module performs operation amplification, noise reduction and digital-to-analog conversion on the potential value signal detected by the measuring electrode to finish the acquisition of resistivity data, and the data is sent to a data terminal through the wireless transmission module to perform inversion processing and leakage analysis to realize remote in-situ monitoring of the petroleum pollution area.
The invention has the beneficial effects that:
(1) The method for acquiring the resistivity among wells in parallel by adopting the multi-channel has high acquisition efficiency, can better realize real-time leakage monitoring and realize remote in-situ leakage monitoring of the petroleum pollution area;
(2) The invention can select any one or more channels to be effective or ineffective, and the influence of a small amount of electrode abnormity on the quality of the whole data is small, thereby improving the monitoring accuracy;
(3) The invention adopts a quadrupole AM-BN acquisition device, can better accord with the three-dimensional observation requirement of the three-dimensional resistivity chromatography perspective hole between wells, weakens the influence of a current channel, has high monitoring precision and can accurately identify the tiny leakage generated in an oil storage area;
(4) The invention does not need to modify the oil storage facilities or the tank body, and can save the leakage monitoring cost of the gas station.
Drawings
FIG. 1 is a schematic view of the system;
FIG. 2 is a schematic diagram of the operation of the multi-channel parallel acquisition device;
FIG. 3 is a schematic diagram of a resistivity probe;
FIG. 4 is a schematic structural diagram of a quadrupole AM-BN collection device;
fig. 5 is a flow chart of a monitoring method.
In the figure: 1, a power supply; 2, a host; 3, a multi-channel motor conversion box; 4, a resistivity probe; 5, a data terminal; 6 an oil storage area; 7, pollution feather; 11 a circuit path switch; 12 a relay; 13 an inner tube; 14 electrode plates; 15 casing tube
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many different forms than those described herein and those skilled in the art will appreciate that the invention is susceptible to similar forms of embodiment without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 4, the oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system comprises a power supply 1, a host 2, a multi-channel parallel acquisition device 3, a multi-stage AM-BN acquisition device and a data terminal 5, wherein the power supply 1, the host 2, the multi-channel parallel acquisition device and the quadrupole AM-BN acquisition device are sequentially connected. The power supply 1 is composed of 12V and 60AH high-power lithium batteries and is connected with the host machine 2 by a special connecting wire.
The host 2 includes an acquisition module and a data wireless transmission module, as shown in fig. 2, the acquisition module includes a programmable operational amplifier circuit, a band pass filter, a pre-conditioning circuit composed of a potential adjustment circuit, and a digital-to-analog conversion circuit, wherein the operational amplifier circuit is used for amplifying signals, the band pass filter is used for separating and denoising signals, and the digital-to-analog conversion circuit is used for converting analog signals into digital signals to complete the acquisition of potential data. The wireless transmission module is formed by a host computer externally connected with a 512M wireless whip antenna, and transmits the acquired resistivity data of the oil storage area to the data terminal 5. And the data terminal 6 receives the resistivity data sent by the wireless transmission module, performs inversion processing imaging and performs leakage analysis of the oil storage facility.
The multichannel parallel acquisition device comprises a multichannel electrode conversion box 3, wherein a plurality of potential channel sockets are arranged in the multichannel electrode conversion box 3, and the number of the potential channel sockets is the same as that of the probes. Twenty-four potential channels are arranged in each potential channel socket, and the number of the potential channels is the same as that of the electrode plates on each probe. The potential channel socket can be connected with a twenty-four-level cable, and in the embodiment, four potential channel sockets are arranged in the multi-channel electrode conversion box 3. All correspond in every passageway and be equipped with relay 12 and current channel switch 11, the electrode connection that corresponds on relay 12's one end and the resistivity probe, the other end and the collection module of relay 12 are connected. The state of the corresponding electrode is controlled by the relay 12 and the current path switch 11. In the working process, any one or more channels can be selected to be effective or ineffective through the relay 12 and the current channel switch 11, and at most ninety-six channels can be acquired simultaneously, so that the parallel acquisition of resistivity values is realized.
As shown in fig. 3, the quadrupole AM-BN collection device includes four resistivity probes 4, the four resistivity probes 4 being located in parallel collection wells, respectively. The resistivity probe comprises an inner tube 13, electrode plates 14 and a sleeve 15, wherein the bottom end of the inner tube 13 is fixedly welded with a conical stainless steel head for penetration, the sleeve 15 is arranged on the outer side of the inner tube 13, a plurality of electrode plates 14 are arranged between the inner tube 13 and the sleeve 15 and uniformly spaced along the axial direction of the inner tube 13, the electrode plates 14 are respectively connected with corresponding relays 12 through leads, and twenty-four electrode plates 14 are arranged on each resistivity probe 4 in the embodiment. The gap between the inner tube 13 and the sleeve 15 is filled with epoxy resin, and the inner tube 13 and the sleeve 15 are fixed by the epoxy resin.
As shown in fig. 4, the quadrupole AM-BN collection device includes a power supply electrode a, a power supply electrode B, a measurement electrode M, and a measurement electrode N, where the power supply electrode a and the measurement electrode M are located on the same resistivity probe, the power supply electrode B and the measurement electrode N are located on the other resistivity probe, and the two power supply electrodes are respectively disposed on the two resistivity probes, so that the influence of a current channel can be weakened. The power supply electrode A and the measuring electrode M are distributed at equal intervals with the power supply electrode B and the measuring electrode N, namely AM = BN = na, wherein a is the polar distance of the probe electrode, namely the distance between two adjacent electrode plates, and N =1,2,3, \ 8230 \ 823023: \ 823023. In the working process, power is supplied to the power supply electrode A and the power supply electrode B, and the potential difference between the measuring electrode M and the measuring electrode N is acquired.
The invention also discloses a method for monitoring the resistivity by using the oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system, which comprises the following steps.
In the first step, a power supply 1 supplies power to a host 2, an acquisition module of the host 2 sends a control instruction, and the on-off of electrodes on a resistivity probe 4 is controlled through a multi-channel parallel acquisition device to manage the working state of each electrode on the probe.
And secondly, collecting the potential value by using a multi-channel parallel collecting device.
The system is provided with i number of probes which are respectively positioned in each parallel collecting well, wherein i is not less than 4, and in the embodiment, i =4.
In the acquisition process, the power supply electrode A and the measuring electrode M are positioned on the No. 1 probe, and the power supply electrode B and the measuring electrode N are positioned on the No. 2 probe. At this time, ninety-six electrode channels in the multi-channel electrode switching box 3 are all opened. Firstly, fixing a power supply electrode A and a measuring electrode M, wherein the power supply electrode A is positioned on an electrode plate at the top of a No. 1 probe, at the moment, AM = a, sequentially moving a power supply electrode B and the measuring electrode N from top to bottom, and respectively collecting potential values of the measuring electrode N and the measuring electrode M in the moving process, thereby obtaining the potential difference between the two measuring electrodes. During the movement, the distance between the power supply electrode B and the measuring electrode N and the distance between the power supply electrode A and the measuring electrode M are always kept equal, namely BN = a.
Next, the electrode distance between the feeding electrode a and the measuring electrode M, and between the feeding electrode B and the measuring electrode N are enlarged by one time, at which AM = BN =2a, and the feeding electrode a and the measuring electrode M are fixed, at which the feeding electrode a is still located at the topmost electrode pad of probe No. 1. And sequentially moving the power supply electrode B and the measuring electrode N from top to bottom, and respectively collecting the potential values of the measuring electrode N and the measuring electrode M in the moving process so as to obtain the potential difference between the two measuring electrodes. Then, the electrode distances between the feeding electrode a and the measuring electrode M and between the feeding electrode B and the measuring electrode N are continued to be enlarged, and the above-described data acquisition process is repeated until the distances between the feeding electrode a and the measuring electrode M and between the feeding electrode B and the measuring electrode N reach the maximum, at which time AM = BN =23a. In the process, the position of the power supply electrode A is kept unchanged, namely the power supply electrode A is always positioned at the electrode plate on the top of the No. 1 probe.
And then, changing the position of the power supply electrode A, so that the power supply electrode A moves downwards by an electrode distance along the No. 1 probe, and keeping the position of the power supply electrode A unchanged. When an electrode distance exists between the power supply electrode A and the measuring electrode M, the power supply electrode A and the measuring electrode M are fixed, at the moment, AM = BN = a, the power supply electrode B and the measuring electrode N are sequentially moved from top to bottom, and potential values of the measuring electrode N and the measuring electrode M are respectively collected in the moving process, so that a potential difference between the two measuring electrodes is obtained. Then, the electrode distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N are gradually enlarged, the steps are repeated, and the potential difference values of the measuring electrode N and the measuring electrode M are collected.
When the electrode distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N reach the maximum, the position of the power supply electrode A is changed again, the power supply electrode A moves downwards along the No. 1 probe in sequence, and in the measuring process, the potential value signals of the measuring electrode N and the measuring electrode M are processed and collected through the collecting module in the action process.
And after the potential value of the No. 2 probe is acquired according to the steps, the power supply electrode B and the measuring electrode N are sequentially transferred to the No. 3 probe and the No. 4 probe, and the measuring process is repeated.
After data measurement and collection of the No. 3 probe and the No. 4 probe are completed in sequence according to the steps, the power supply electrode A and the measuring electrode M are transferred to the No. 2 probe, at the moment, 72 potential channels of the No. 2 probe, the No. 3 probe and the No. 4 probe are opened, the power supply electrode B and the measuring electrode N are located on the No. 3 probe and the No. 4 probe in sequence, and the measuring process is repeated.
And finally, transferring the power supply electrode A and the measuring electrode M to the No. 3 probe, starting 48 potential channels of the No. 3 probe and the No. 4 probe, and repeating the measuring process when the power supply electrode B and the measuring electrode B are positioned on the No. 4 probe, thereby realizing the measurement and acquisition of the three-dimensional all-directional potential value of the interwell area.
And thirdly, the acquisition module performs operation amplification, noise reduction, digital-to-analog conversion and other processing on the potential value signal detected by the measuring electrode to finish the acquisition of the resistivity data. And the data is sent to a data terminal 5 through a wireless transmission module, inversion processing and leakage analysis are carried out, and remote in-situ monitoring of the petroleum pollution area is realized.
The oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system and method provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A three-dimensional resistivity monitoring system between oil storage area multichannel parallel acquisition wells comprises a power supply (1), a host (2), and is characterized by further comprising a multichannel parallel acquisition device (3), a quadrupole AM-BN acquisition device and a data terminal (5), wherein the power supply (1), the host (2), the multichannel parallel acquisition device and the quadrupole AM-BN acquisition device are sequentially connected;
the multichannel parallel acquisition device comprises a multichannel electrode conversion box (3), wherein a plurality of potential channel sockets are arranged in the multichannel electrode conversion box (3), the number of the potential channel sockets is equal to that of probes, twenty-four potential channels are arranged in each potential channel socket, a relay (12) and a current channel switch (11) are correspondingly arranged in each channel, one end of each relay (12) is connected with a corresponding electrode on a resistivity probe, and the other end of each relay (12) is connected with an acquisition module;
the quadrupole AM-BN acquisition device comprises a plurality of resistivity probes (4), and the resistivity probes (4) are respectively positioned in parallel acquisition wells;
the quadrupole AM-BN acquisition device further comprises a power supply electrode A, a power supply electrode B, a measuring electrode M and a measuring electrode N, wherein the power supply electrode A and the measuring electrode M are located on the same resistivity probe, the power supply electrode B and the measuring electrode N are located on the other resistivity probe, the power supply electrode A and the measuring electrode M, the power supply electrode B and the measuring electrode N are distributed at equal intervals, AM = BN = na, wherein a is the polar distance of the probe electrodes, and N =1,2,3, 8230, 823023.
2. The system for monitoring the three-dimensional resistivity among the wells for the multi-channel parallel acquisition of the oil storage area according to claim 1, wherein the host (2) comprises an acquisition module and a data wireless transmission module, wherein the acquisition module comprises an operational amplification circuit for amplifying signals, a band-pass filter for separating and denoising the signals, a pre-conditioning circuit consisting of a potential adjustment circuit, and a digital-to-analog conversion circuit for converting analog signals into digital signals.
3. The oil storage area multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system according to claim 1, wherein the resistivity probe comprises an inner tube (13), electrode plates (14) and a sleeve (15), a conical stainless steel head for penetration is fixedly welded at the bottom end of the inner tube (13), the sleeve (15) is arranged on the outer side of the inner tube (13), a plurality of electrode plates (14) are uniformly arranged between the inner tube (13) and the sleeve (15) and along the axial direction of the inner tube (13), the electrode plates (14) are respectively connected with corresponding relays (12) through leads, twenty-four electrode plates (14) are arranged on each resistivity probe (4), and epoxy resin is filled in a gap between the inner tube (13) and the sleeve (15).
4. The system for monitoring the three-dimensional resistivity between wells for the multi-channel parallel acquisition of an oil reservoir according to claim 1, wherein the quadrupole AM-BN acquisition device comprises four resistivity probes (4).
5. A method of monitoring resistivity using the monitoring system of any one of claims 1-4, comprising the steps of:
s1, a power supply supplies power to a host, an acquisition module of the host sends a control instruction, and a multi-channel parallel acquisition device controls the on-off of electrodes on a resistivity probe and manages the working state of each electrode on the probe;
s2, acquiring a potential value by using a multi-channel parallel acquisition device:
s2.1, a power supply electrode A and a measuring electrode M are positioned on the resistivity probe No. 1, a power supply electrode B and a measuring electrode N are positioned on the resistivity probe No. 2, and at the moment, ninety-six electrode channels in the multi-channel electrode conversion box are all opened;
s2.1.1 fixing a power supply electrode A and a measuring electrode M, wherein the power supply electrode A is located on an electrode plate at the top of a No. 1 resistivity probe, AM = a is adopted, the power supply electrode B and the measuring electrode N are sequentially moved from top to bottom, in the moving process, the power supply electrode B and the measuring electrode N are always kept at equal intervals, BN = a is adopted, and in the moving process, potential values of the measuring electrode N and the measuring electrode M are respectively acquired, so that the potential difference between the two measuring electrodes is obtained;
s2.1.2, electrode distances between a power supply electrode A and a measuring electrode M and between a power supply electrode B and the measuring electrode N are expanded by one time, AM = BN =2a, the power supply electrode A is located at an electrode plate at the top of a No. 1 probe resistivity needle, the power supply electrode A and the measuring electrode M are fixed, the power supply electrode B and the measuring electrode N are sequentially moved from top to bottom, and potential differences between the measuring electrode N and the measuring electrode M are respectively collected in the moving process;
s2.1.3, continuously enlarging the electrode distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N, and repeating the data acquisition process until the distances between the power supply electrode A and the measuring electrode M and between the power supply electrode B and the measuring electrode N reach the maximum, wherein AM = BN =23a, and in the process, the power supply electrode A is kept at the electrode plate on the top of the resistivity probe No. 1 all the time;
s2.1.4, when AM = BN =23a, changing the position of the power supply electrode A, keeping the position of the power supply electrode A unchanged after the power supply electrode A moves downwards along the No. 1 resistivity probe by an electrode distance, and repeating the steps S2.1.1 to S2.1.3;
when AM = BN =22a, changing the position of the power supply electrode A again, enabling the power supply electrode A to move downwards along the resistivity probe No. 1 in sequence, keeping the position of the power supply electrode A unchanged, repeating the steps from S2.1.1 to S2.1.3 until AM = BN = a, and finishing the acquisition of the potential value of the resistivity probe No. 2;
s2.1.5, sequentially transferring the power supply electrode B and the measuring electrode N to the resistivity probe No. 3 and the resistivity probe No. 4, repeating the steps S2.1.1 to S2.1.4, and sequentially completing data measurement and acquisition of the resistivity probe No. 3 and the resistivity probe No. 4;
s2.2, transferring the power supply electrode A and the measuring electrode M to the resistivity probe No. 2, starting seventy-two potential channels from the resistivity probe No. 2 to the resistivity probe No. 4, enabling the power supply electrode B and the measuring electrode N to be sequentially positioned on the resistivity probe No. 3 and the resistivity probe No. 4, and repeating the step S2.1;
s2.3, sequentially transferring the power supply electrode A and the measuring electrode M to the resistivity probe No. 3, enabling the power supply electrode B and the measuring electrode B to be located on the resistivity probe No. 4, starting forty-eight potential channels of the resistivity probe No. 3 and the resistivity probe No. 4, repeating the step S2.1, and completing measurement and collection of three-dimensional potential values of an interwell area;
and S3, the acquisition module performs operational amplification, noise reduction and digital-to-analog conversion on the potential value signal detected by the measuring electrode to complete acquisition of resistivity data, and the data is sent to a data terminal through the wireless transmission module to perform inversion processing and leakage analysis to realize remote in-situ monitoring of the petroleum pollution area.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117031552A (en) * | 2023-08-16 | 2023-11-10 | 河海大学 | Resistivity tomography measuring system and method based on multichannel electrode design |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117031552A (en) * | 2023-08-16 | 2023-11-10 | 河海大学 | Resistivity tomography measuring system and method based on multichannel electrode design |
| CN117031552B (en) * | 2023-08-16 | 2024-05-28 | 河海大学 | Resistivity tomography measuring system and method based on multichannel electrode design |
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