A method, system and storage medium for determining oil and gas fracturing crack height

Abstract

A method, system and storage medium for determining the height of oil and gas fracturing cracks, the method comprising: obtaining a set of potential difference signals; obtaining corresponding initial characteristic data according to multiple potential difference signals; preprocessing multiple initial characteristic parameters in the initial characteristic data to obtain multiple gradient anomaly characteristic parameters; determining the height information of the fracturing fluid affected body formed by the fracturing well in the area monitored by the corresponding potential measurement line according to the multiple gradient anomaly characteristic parameters. The embodiment of the present invention can collect potential difference signals of multiple continuous positions on the ground corresponding to the crack by laying out potential measurement lines, and then can obtain multiple initial characteristic parameters affected by the crack morphology according to these potential difference signals, and obtain gradient anomaly characteristic parameters that can accurately correspond to the crack height by further preprocessing the initial characteristic parameters, and finally use the gradient anomaly characteristic parameters to quickly complete the determination of the height information of the crack.

Description

Technical Field

[0001] The present invention belongs to the field of oil and gas fracturing monitoring, and in particular relates to an oil and gas fracturing crack height determination method, system and storage medium. Background Art

[0002] In the field of petroleum, fracturing refers to a method of using hydraulic force to form cracks in oil and gas layers during oil or gas production, also known as hydraulic fracturing. The principle of hydraulic fracturing is to use a high-pressure pump on the ground to squeeze a fracturing fluid with a high viscosity into the oil layer through the wellbore. When the injection speed of the fracturing fluid exceeds the absorption capacity of the oil layer, a very high pressure is formed on the oil layer at the bottom of the well. When this pressure exceeds the fracture stress of the oil layer rock near the bottom of the well, the oil layer will be squeezed open and cracks will be generated. At this time, the fracturing fluid is continuously squeezed into the oil layer, and the cracks will continue to expand into the oil layer. In order to keep the cracks opened in an open state, a sand-carrying fluid with a proppant (usually quartz sand) is then squeezed into the oil layer. After the sand-carrying fluid enters the crack, on the one hand, it can make the crack continue to extend forward, and on the other hand, it can support the cracks that have been opened so that they will not close. Then, a displacement fluid is injected to displace all the sand-carrying fluid in the wellbore into the cracks, and the cracks are propped up with quartz sand. Finally, the injected high-viscosity fracturing fluid will automatically degrade and be discharged from the wellbore, leaving one or more cracks of varying lengths, widths, and heights in the oil layer, establishing a new fluid channel between the oil layer and the wellbore. After fracturing, the production of oil and gas wells generally increases significantly.

[0003] After fracturing measures are implemented in oil and gas wells, effective monitoring methods are needed to determine the effect of fracturing operations and obtain information such as the conductivity, geometry, complexity and orientation of fracturing-induced fractures, so as to improve the effect of fracturing and production increase operations in shale gas reservoirs and the production capacity of gas wells, and increase shale gas recovery. Among them, obtaining fracture height information is of utmost importance. To obtain fracturing height information, not only a professional monitoring system is required to complete the detection work (for example, detection can be completed by monitoring surface vibration signals, or by detecting surface electric field signals), but also, after obtaining accurate data, corresponding methods are needed to obtain useful parameters from the collected data for subsequent fracture morphology analysis. Now, there is a method in this field to determine fracture height based on electrical monitoring. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for determining the height of an oil and gas hydraulic fracturing crack, which can effectively and accurately complete the determination of the height information of the hydraulic fracturing crack. The present invention also proposes an oil and gas hydraulic fracturing crack height determination system and a storage medium for storing computer executable instructions of the above-mentioned oil and gas hydraulic fracturing crack height determination method.

[0005] According to the first aspect of the present invention, the method for determining the height of an oil and gas fracturing crack comprises the following steps:

[0006] Acquire a group of potential difference signals, each group of the potential difference signals is collected by a potential measuring line, the potential measuring line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each of the signal detection units is used to collect a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal;

[0007] Acquire corresponding initial characteristic data according to the plurality of potential difference signals, wherein the initial characteristic data includes a plurality of initial characteristic parameters stored in sequence, and the plurality of initial characteristic parameters correspond one-to-one to the plurality of potential difference signals;

[0008] Preprocessing a plurality of the initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are all used to characterize the fracture height of the fracturing fluid affected body corresponding to the position where the signal detection unit is located;

[0009] The height information of the fracturing fluid affected body formed in the fracturing well corresponding to the area monitored by the potential measuring line is determined according to a plurality of gradient anomaly characteristic parameters.

[0010] The method for determining the height of oil and gas fracturing cracks according to the embodiment of the present invention has at least the following technical effects: by laying out potential measuring lines, potential difference signals of multiple continuous positions on the ground corresponding to the cracks can be collected, and then multiple initial characteristic parameters affected by the crack morphology can be obtained based on these potential difference signals, and by further preprocessing the initial characteristic parameters, gradient anomaly characteristic parameters that can accurately correspond to the crack height are obtained, and finally the gradient anomaly characteristic parameters are used to quickly complete the determination of the crack height information. The method for determining the height of oil and gas fracturing cracks according to the embodiment of the present invention can quickly determine the crack height information, thereby providing a basis for real-time crack monitoring and providing effective guidance for on-site, especially mining work.

[0011] According to some embodiments of the present invention, the fracturing fluid affected body is equivalent to a first micro-resistance-capacitance model consisting of a first equivalent resistor and a first equivalent capacitor in series; the stratum between the upper surface of the fracturing fluid affected body and the ground is equivalent to a second micro-resistance-capacitance model, the second micro-resistance-capacitance model includes a second equivalent resistor and a second equivalent capacitor connected in series, and a third equivalent capacitor connected in parallel with the second equivalent resistor; the first micro-resistance-capacitance model and the second micro-resistance-capacitance model are connected in series to form a fracturing monitoring electrical model;

[0012] The method of determining the height information of the fracturing fluid affected body formed by the fracturing well corresponding to the area monitored by the potential measuring line according to the plurality of gradient anomaly characteristic parameters comprises the following steps:

[0013] Based on the fracturing monitoring electrical model, the fracture height corresponding to the position of the signal detection unit is confirmed according to each of the gradient anomaly characteristic parameters, wherein the gradient anomaly characteristic parameter is inversely proportional to the fracture height.

[0014] According to some embodiments of the present invention, the step of acquiring corresponding initial characteristic data according to the plurality of potential difference signals comprises the following steps:

[0015] Performing signal conditioning on the potential difference signal collected by each of the signal detection units, and converting each of the potential difference signals after signal conditioning into a digital signal;

[0016] Removing spike pulses from each of the digital signals, and performing digital filtering processing on each of the digital signals after the spike pulses are removed;

[0017] Performing a deconvolution algorithm on each of the digital signals and the AC excitation signal after digital filtering to obtain a plurality of change data sets;

[0018] A corresponding plurality of initial feature parameters are calculated according to the plurality of change data sets.

[0019] According to some embodiments of the present invention, the signal conditioning includes at least impedance transformation, bandpass filtering, and program-controlled amplification.

[0020] According to some embodiments of the present invention, the step of calculating corresponding multiple initial feature parameters based on the multiple change data sets includes the following steps:

[0021] An absolute value integration is performed on each of the change data sets, and the values ​​after the absolute value integration are averaged to obtain the corresponding initial characteristic parameters.

[0022] According to some embodiments of the present invention, the preprocessing of the plurality of initial feature parameters in the initial feature data comprises the following steps:

[0023] Normalizing the multiple initial feature parameters in the initial feature data to obtain corresponding normalized feature data, wherein the normalized feature data includes multiple normalized feature parameters corresponding one-to-one to the multiple initial feature parameters;

[0024] Determine the minimum normalized feature parameter in the normalized feature data and record it as the minimum normalized feature parameter;

[0025] Subtracting a corresponding preset background characteristic parameter from each of the normalized characteristic parameters in the normalized characteristic data to obtain net abnormal characteristic data, wherein the net abnormal characteristic data includes a plurality of net abnormal characteristic parameters corresponding one to one to the plurality of the normalized characteristic parameters;

[0026] Subtracting the corresponding minimum normalized characteristic parameter from each of the net abnormal characteristic parameters in the net abnormal characteristic data to obtain intermediate characteristic data, wherein the intermediate characteristic data includes a plurality of intermediate characteristic parameters corresponding one-to-one to the plurality of the net abnormal characteristic parameters;

[0027] The gradient anomaly data corresponding to the intermediate characteristic data is determined according to the intermediate characteristic data, and the gradient anomaly data is used to characterize the fracture morphology of the fracturing wave group formed in the fracturing well.

[0028] According to some embodiments of the present invention, the normalizing the plurality of initial feature parameters in the initial feature data comprises the following steps:

[0029] Each of the initial characteristic parameters is normalized using a normalized current value to obtain a plurality of normalized characteristic parameters, wherein the normalized current value is the current value of the AC excitation signal emitted by the transmitting system when the potential difference signal corresponding to the initial characteristic parameter is collected.

[0030] According to some embodiments of the present invention, the background characteristic parameters are obtained by the following steps:

[0031] Acquiring a plurality of background potential signals collected by the potential measuring line before the start of fracturing;

[0032] A plurality of the background characteristic parameters are obtained according to the plurality of the background potential signals, and the plurality of the background characteristic parameters correspond one-to-one to the plurality of the initial characteristic data.

[0033] According to some embodiments of the present invention, determining the gradient anomaly data corresponding to the intermediate feature data according to the intermediate feature data comprises the following steps:

[0034] Each intermediate characteristic parameter in each group of the intermediate characteristic data is subtracted from the previous intermediate characteristic parameter to obtain a gradient anomaly characteristic parameter, and the obtained multiple gradient anomaly characteristic parameters are recorded as the gradient anomaly data.

[0035] According to the second aspect of the present invention, a system for determining the height of an oil and gas fracturing crack comprises:

[0036] A potential data acquisition unit, used to acquire a group of potential difference signals, each group of the potential difference signals is acquired by a potential measurement line, the potential measurement line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each of the signal detection units is used to acquire a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal;

[0037] A characteristic parameter acquisition unit, used for acquiring corresponding initial characteristic data according to the plurality of potential difference signals, wherein the initial characteristic data comprises a plurality of initial characteristic parameters stored in sequence, and the plurality of initial characteristic parameters correspond one-to-one to the plurality of potential difference signals;

[0038] A preprocessing unit, used for preprocessing a plurality of the initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are used for characterizing the fracture height of the fracturing fluid swept body corresponding to the position where the signal detection unit is located;

[0039] The fracture height determination unit is used to determine the height information of the fracturing fluid affected body formed in the fracturing well corresponding to the area monitored by the potential measurement line according to a plurality of gradient anomaly characteristic parameters.

[0040] The oil and gas fracturing crack height determination system according to the embodiment of the present invention has at least the following technical effects: by laying out the potential measurement lines, the potential difference signals of multiple continuous positions on the ground corresponding to the cracks can be collected, and then multiple initial characteristic parameters affected by the crack morphology can be obtained according to these potential difference signals, and by further preprocessing the initial characteristic parameters, the gradient abnormal characteristic parameters that can accurately correspond to the crack height are obtained, and finally the gradient abnormal characteristic parameters are used to quickly complete the determination of the crack height information. The oil and gas fracturing crack height determination system according to the embodiment of the present invention can quickly determine the crack height information, thereby providing a basis for real-time crack monitoring and providing effective guidance for on-site, especially mining work.

[0041] According to the computer-readable storage medium of the embodiment of the third aspect of the invention, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the above-mentioned method for determining the height of oil and gas fracturing cracks.

[0042] The computer-readable storage medium according to the embodiment of the present invention has at least the following beneficial effects: the storage medium can facilitate the storage and transfer of computer-executable instructions.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 is a flowchart of a method for determining oil and gas fracturing crack height according to an embodiment of the present invention;

[0046] Figure 2 is a flowchart of extracting initial feature parameters according to an embodiment of the present invention;

[0047] Figure 3 is a system block diagram of extracting gradient anomaly data according to an embodiment of the present invention;

[0048] Figure 4 is a schematic diagram of the layout of a fracturing detection system according to an embodiment of the present invention;

[0049] Figure 5 Schematic diagram of electric field curve formed by fracturing fluid and body according to an embodiment of the present invention;

[0050] Figure 6 Schematic diagram of the layout of the potential measurement line (horizontal well) of an embodiment of the present invention;

[0051] Figure 7 is a waveform diagram of an AC excitation signal emitted by a transmitting system according to an embodiment of the present invention;

[0052] Figure 8 is a waveform diagram of a potential difference signal collected by a signal detection unit according to an embodiment of the present invention;

[0053] Fig. 9 is a schematic diagram of overlapping signal waveforms of an AC excitation signal and a potential difference signal collected by a signal detection unit according to an embodiment of the present invention;

[0054] Fig.10 is an equivalent schematic diagram of a fracturing fluid swept body according to an embodiment of the present invention;

[0055] Fig.11 It is a schematic diagram of the deconvolution algorithm;

[0056] Fig.12 4 is a system block diagram of a system for determining the height of oil and gas fracturing cracks according to an embodiment of the present invention. DETAILED DESCRIPTION

[0057] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0060] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0061] In order to better describe the oil and gas fracturing crack height determination method according to the embodiment of the present invention, a monitoring system for executing the oil and gas fracturing crack height determination method according to the embodiment of the present invention is briefly described herein.

[0062] like Figure 4 As shown, Figure 4 The schematic diagram of the monitoring system layout is shown in Figure 1. The transmitting system includes two emitters A and B. Emitter A is connected to the wellhead of the fracturing wellbore, and emitter B is connected to infinity (which can be understood as grounding). After emitter A transmits an AC excitation signal to the wellhead, emitter A can form a loop with emitter B through the ground, thereby completing the transmission of the AC excitation signal to the wellbore. The receiving system includes a common electrode N, multiple signal detection units (for example, copper rods and other metal rods with good conductivity can be used), and a data acquisition unit, a storage unit, and a processor unit for receiving signals from the signal detection units. The multiple signal detection units are Figure 4 As shown in the figure, the common electrode N of the receiving system is connected to the wellhead of the wellbore, so as to form a loop with multiple signal detection units and ensure that the potential difference signals detected by each signal detection unit can have the same reference. After the transmitting system transmits the test alternating current to the wellbore, each signal detection unit can detect the potential difference signal, and then the potential difference signal can be used to complete the analysis of the crack morphology.

[0063] refer to Figure 5 , Figure 5The solid line in the middle ellipse is the affected body of the fracturing fluid, the dotted line in the ellipse is the electric field distribution diagram, and the curve above the ground is the electric field distribution curve composed of multiple potential difference signals collected by the potential measurement line. Figure 6 The black solid point in the middle has two vertical and two horizontal lines, and all four lines are potential measurement lines. Figure 5 The curve in can be regarded as the electric field distribution curve obtained by measuring any potential measuring line. Figures 7 to 9 , here is an explanation of the initial feature parameters to facilitate understanding of the subsequent steps. Figure 7 , Fig. 9 The square wave signal is the AC excitation signal sent by the transmitting system to the wellbore. Figure 8 , Fig. 9 The signal with curvature in the image is the potential difference signal received by the signal detection unit, and as the crack morphology changes, Figure 8 , Fig. 9 The curvature of the signal will also change, so the reference Fig. 9 , we only need to determine the area between the AC excitation signal and the potential difference signal received by the signal detection unit, and we can determine the signal changes caused by different fracture morphologies based on this area. Therefore, this area is determined as the initial characteristic parameter here. However, there may be other interference factors in the initial characteristics, so we need to eliminate the influence of these factors to obtain the most accurate parameters to determine the fracture morphology, that is, to obtain the gradient anomaly parameters. Finally, we can determine the height information of the fracturing fluid affected body in the corresponding area of ​​the potential measurement line based on multiple gradient anomaly parameters.

[0064] According to the following Figures 1 to 11 The method for determining the height of an oil and gas fracturing crack according to the first embodiment of the present invention is described. The method for determining the height of an oil and gas fracturing crack comprises the following steps:

[0065] Acquire a group of potential difference signals, each group of potential difference signals is collected by a potential measurement line, the potential measurement line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each signal detection unit is used to collect a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal;

[0066] Acquire corresponding initial characteristic data according to the multiple potential difference signals, the initial characteristic data comprising multiple initial characteristic parameters stored in sequence, the multiple initial characteristic parameters corresponding to the multiple potential difference signals one by one;

[0067] Preprocessing a plurality of initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are used to characterize the fracture height of the fracturing fluid swept body at the location where the corresponding signal detection unit is located;

[0068] The height information of the fracturing fluid swept body formed by the fracturing well in the area monitored by the corresponding potential measurement line is determined according to a plurality of gradient anomaly characteristic parameters.

[0069] refer to Figures 1 to 11 , the potential measurement line usually includes a plurality of signal detection units arranged at equal intervals, and the length of the potential measurement line arrangement is usually long enough to ensure that the entire fracturing fluid affected body can be detected. When the fracturing well is fracturing, the AC excitation signal is continuously transmitted to the fracturing well through the transmitting system, and the potential difference signal is continuously collected through each signal detection unit. After the potential difference signal is collected, the initial characteristic parameters caused only by the crack change are obtained from each potential difference signal. However, the initial characteristic parameters extracted at this time also contain the influence of many interference factors, so it is necessary to preprocess the initial characteristic parameters to obtain the gradient characteristic parameters containing only net anomalies. After the initial characteristic parameters eliminate the influencing factors, they only contain the net anomaly values ​​corresponding to the crack changes. Finally, multiple height information can be determined using multiple gradient anomaly characteristic parameters, and the multiple height information corresponds to the height of the fracturing fluid affected body in the area where the different detection units are located. In actual engineering, by using a large number of potential measurement lines to complete the detection of more potential difference signals, the height information of the cracks formed by the entire fracturing well can be effectively determined. It should be noted that a relatively simple method can be used to determine the area of ​​the fracturing affected body. For example, there is a huge difference in the electric field when there are cracks and when there are no cracks in the same area. Therefore, the range of the fracturing fluid affected body can be directly determined by determining the area of ​​the electric field distribution of multiple potential measurement lines.

[0070] According to the method for determining the height of oil and gas fracturing cracks in the embodiment of the present invention, by laying out potential measuring lines, potential difference signals of multiple continuous positions on the ground corresponding to the cracks can be collected, and then multiple initial characteristic parameters affected by the crack morphology can be obtained based on these potential difference signals, and by further preprocessing the initial characteristic parameters, gradient anomaly characteristic parameters that can accurately correspond to the crack height are obtained, and finally the gradient anomaly characteristic parameters are used to quickly complete the determination of the height information of the cracks. The method for determining the height of oil and gas fracturing cracks in the embodiment of the present invention can quickly determine the crack height information, thereby providing a basis for real-time crack monitoring and providing effective guidance for on-site, especially mining work.

[0071] In some embodiments of the present invention, the affected body of the fracturing fluid is equivalent to a first micro-resistance-capacitance model consisting of a first equivalent resistor and a first equivalent capacitor connected in series; the stratum between the upper surface of the affected body of the fracturing fluid and the ground is equivalent to a second micro-resistance-capacitance model, the second micro-resistance-capacitance model includes a second equivalent resistor and a second equivalent capacitor connected in series, and a third equivalent capacitor connected in parallel with the second equivalent resistor; the first micro-resistance-capacitance model and the second micro-resistance-capacitance model are connected in series to form a fracturing monitoring electrical model;

[0072] Determining the height information of the fracturing fluid swept body formed by the fracturing well in the area monitored by the corresponding potential measurement line according to multiple gradient anomaly characteristic parameters includes the following steps:

[0073] Based on the electrical model of fracturing monitoring, the fracture height at the location of the corresponding signal detection unit is confirmed according to each gradient anomaly characteristic parameter, wherein the gradient anomaly characteristic parameter is inversely proportional to the fracture height.

[0074] refer to Figure 4 The second micro-resistance-capacitance model is equivalent to the formation part (between the fracturing fluid affected body and the ground). Theoretically, during the fracturing process, the values ​​of the second equivalent resistance and the second equivalent capacitance themselves will not change, and can be regarded as a static background (that is, it can be treated as a larger constant); the fracturing fluid affected body is equivalent to the first micro-resistance-capacitance model composed of the first equivalent resistance and the first equivalent capacitance in series, and the upper surface and the lower surface of the fracturing fluid affected body can be equivalent to the upper plate and the lower plate of the first equivalent capacitor. After the fracturing fluid is injected into the wellbore of the fracturing well, as the volume of the fracturing fluid affected body continues to change, the distance between the upper plate and the lower plate equivalent to the first equivalent capacitor and the plate area are constantly changing, so the values ​​of the first equivalent resistance and the first equivalent capacitance are also changing. Therefore, based on the electrical model of fracturing monitoring, the collected potential difference signal will also change accordingly, and this change is also caused by the change of the first micro-resistance-capacitance model. The potential difference signals detected at different monitoring points are different, so the potential difference signals collected at the monitoring points can be analyzed based on the fracturing monitoring electrical model to obtain the morphological data of the cracks corresponding to the detection location of the monitoring points. The morphological data can specifically be the height and area data of the cracks.

[0075] The principle is further described here. Fig.10 The flat plate capacitor is composed of two parallel plates. The area of ​​the two plates is S, the distance between the two plates is d, and the space between the two plates is filled with a conductive medium. The dielectric constant of the conductive medium is ε. According to the capacitance formula of the flat plate capacitor:

[0076]

[0077] It can be seen that the capacitance of a flat plate capacitor is proportional to the area S of the plate and inversely proportional to the distance d between the plates.

[0078] The electrical model for fracturing monitoring considers the fracturing fluid affected body as an equivalent model of the first equivalent resistor and the first equivalent capacitor. Fig.10 As shown in the figure, the upper top plate of the fracturing fluid affected body is regarded as the plate A of the flat capacitor, the lower top plate is regarded as the plate B of the flat capacitor, and the fracturing fluid is regarded as the conductive medium between the two plates. Then, the crack height h of the fracturing fluid affected body in the fracturing monitoring can be equivalent to the distance d between the two plates of the flat capacitor, that is,

[0079] h=d.

[0080] The obtained gradient anomaly characteristic parameter U c In this model, it can be equivalent to U c =τ=RC, then we can get:

[0081]

[0082] make Define β as the engineering correction coefficient, then:

[0083]

[0084] Then the crack height h for fracturing monitoring can be calculated:

[0085]

[0086] It can be seen that the crack height h of the fracturing monitoring is proportional to the plate area S of the flat capacitor and the monitoring characteristic parameter U c Inversely proportional.

[0087] It should be noted that the swept area of ​​the fracturing fluid swept body is determined by the area decomposition method, that is, when the above formula is used for height derivation, it can be treated as a constant. For the engineering correction coefficient β, it can be obtained by model measurement (for example, a geometric model is constructed under an experimental environment to determine β), that is, for different characteristic parameters U c It can correspond to a set of β values, and then β can be treated as a constant in a certain state.

[0088] In some embodiments of the present invention, obtaining corresponding initial characteristic data according to a plurality of potential difference signals comprises the following steps:

[0089] Performing signal conditioning on the potential difference signal collected by each signal detection unit, and converting each potential difference signal after signal conditioning into a digital signal;

[0090] Removing spike pulses from each digital signal, and performing digital filtering on each digital signal after the spike pulses are removed;

[0091] Performing a deconvolution algorithm on each digital signal and the AC excitation signal after digital filtering to obtain a plurality of change data sets;

[0092] Corresponding multiple initial feature parameters are calculated according to the multiple change data sets.

[0093] After the potential difference signal read by the signal detection unit is obtained, the signal has a lot of interference and the signal itself is weak. Therefore, signal conditioning is required. After the conditioning is completed, the analog signal is converted into a digital signal so that it can be read and stored by the analog-to-digital conversion module, which makes it easier to process the data. Considering that there is inductive coupling between the signal detection unit and the common electrode and the ground, that is, there is "spike pulse" interference on both the rising and falling edges of the step signal (such as Figure 8 This interference will affect the stability of the measurement to a certain extent, so it is necessary to filter or "chop decouple" the interference of the spike pulse. After filtering the data to eliminate the spike pulse, the influence of the interference factor is basically eliminated. At this time, the characteristic parameters can be formally extracted.

[0094] refer to Fig.11 , the AC excitation signal is regarded as the input quantity X, the potential difference signal collected by the signal detection unit is regarded as the response output quantity Y after passing through the linear time-invariant system C, and the entire fracturing characteristic parameter system that causes this change can be regarded as the linear time-invariant system C. Then according to the deconvolution theory, the digital signal converted by the analog-to-digital conversion module is regarded as y(t), and the waveform data set of the AC excitation signal emitted by the transmitting system is regarded as x(t). The change data set c(t) generated by the AC excitation signal after passing through the fracturing target layer system can be solved by the deconvolution algorithm, and the characteristic parameters can be obtained by performing absolute value integration on the data set and taking the mean.

[0095] In some embodiments of the present invention, signal conditioning includes at least impedance transformation, bandpass filtering, and program-controlled amplification, which can reduce clutter interference and allow data to be better converted to digital by the analog-to-digital conversion module.

[0096] In some embodiments of the present invention, the digital filtering process uses at least one of FIR filtering, IIR filtering, and sliding average filtering. FIR filtering, IIR filtering, and sliding average filtering can achieve better filtering effects and filter out the influence of clutter.

[0097] In some embodiments of the present invention, the corresponding multiple initial feature parameters are calculated based on multiple change data sets, including the following steps: performing absolute value integration on each change data set, and averaging the absolute value integrated values ​​to obtain the corresponding initial feature parameters. Based on the absolute value integration method, the initial feature parameters (i.e. Fig. 9 The area between the square wave and the curved wave).

[0098] In some embodiments of the present invention, the spike pulse of the digital signal is removed, including the following steps: filtering the spike pulse at the rising edge and the spike pulse after the falling edge of the step signal in the digital signal through exponential function fitting or directly returning them to 0 value to remove the spike pulse. The spike pulse can be eliminated by filtering through exponential function fitting. In some cases, the spike pulse position can be directly returned to 0 to eliminate it.

[0099] In some embodiments of the present invention, preprocessing a plurality of initial feature parameters in the initial feature data comprises the following steps:

[0100] Normalizing a plurality of initial feature parameters in the initial feature data to obtain corresponding normalized feature data, wherein the normalized feature data includes a plurality of normalized feature parameters corresponding one-to-one to the plurality of initial feature parameters;

[0101] Determine the minimum normalized feature parameter in the normalized feature data and record it as the minimum normalized feature parameter;

[0102] Subtracting a corresponding preset background feature parameter from each normalized feature parameter in the normalized feature data to obtain net abnormality feature data, wherein the net abnormality feature data includes a plurality of net abnormality feature parameters corresponding one to one to the plurality of normalized feature parameters;

[0103] Subtracting the corresponding minimum normalized characteristic parameter from each net abnormal characteristic parameter in the net abnormal characteristic data to obtain intermediate characteristic data, wherein the intermediate characteristic data includes a plurality of intermediate characteristic parameters corresponding one-to-one to the plurality of net abnormal characteristic parameters;

[0104] The gradient anomaly data corresponding to the intermediate characteristic data is determined according to the intermediate characteristic data, and the gradient anomaly data is used to characterize the fracture morphology of the fracturing wave group formed by the fracturing well.

[0105] Each potential measuring line will collect potential difference signals at a certain interval, and obtain a set of initial characteristic data based on this set of potential difference signals. After collecting multiple times, a two-dimensional parameter table can be formed, as shown in Table 1. In Table 1, P 1 To P n are multiple signal detection units of a potential measuring line, t 1 to m For different moments.

[0106] Table 1

[0107] <![CDATA[P 1 ]]> <![CDATA[P 2 ]]> <![CDATA[P 3 ]]> …… <![CDATA[P n ]]> Minimum <![CDATA[t 1 ]]> <![CDATA[U t1-1 ]]> <![CDATA[U t1-2 ]]> <![CDATA[U t1-3 ]]> <![CDATA[U t1-n ]]> <![CDATA[U t1min ]]> <![CDATA[t 2 ]]> <![CDATA[U t2-1 ]]> <![CDATA[U t2-2 ]]> <![CDATA[U t2-3 ]]> <![CDATA[U t2-n ]]> <![CDATA[U t2min ]]> <![CDATA[t 3 ]]> <![CDATA[U t3-1 ]]> <![CDATA[U t3-2 ]]> <![CDATA[U t3-3 ]]> <![CDATA[U t3-n ]]> <![CDATA[U t3min ]]> <![CDATA[t 4 ]]> <![CDATA[U t4-1 ]]> <![CDATA[U t4-2 ]]> <![CDATA[U t4-3 ]]> <![CDATA[U t4-n ]]> <![CDATA[U t4min ]]> …… …… …… …… …… …… <![CDATA[t m ]]> <![CDATA[U tm-1 ]]> <![CDATA[U tm-2 ]]> <![CDATA[U tm-3 ]]> <![CDATA[U tm-n ]]> <![CDATA[U tmmin ]]>

[0108] After obtaining the initial characteristic data, multiple initial characteristic parameters in the initial characteristic data will be normalized to eliminate the error caused by the current change of the transmitting system. It should be noted that the initial characteristic data collected at different times will be normalized using the current data of the corresponding transmitting system. At the same time, after the normalization process, the normalized characteristic parameter with the smallest value in the normalized characteristic data will be determined and recorded as the minimum normalized characteristic parameter for subsequent use in eliminating DC bias.

[0109] After obtaining the normalized characteristic data, it is necessary to eliminate the potential signal changes generated by the background field (potential difference signal generated in the non-fracture area) itself to obtain the net abnormal changes caused by the fracture itself. For oil and gas fracturing, before the fracture is formed, the entire fracturing layer, environmental interference, human interference, etc. are in a "relative static" state. Then, the potential difference signal (i.e., background potential signal) measured by the potential measurement line at this time can be used to construct multiple background characteristic parameters, and the multiple background characteristic parameters correspond to multiple signal detection units in the potential measurement line one by one. The process of obtaining background characteristic parameters can be applied to the process of obtaining initial characteristic data. It should be noted that for the acquisition of background field data, in order to ensure the quality of background field data acquisition, the potential measurement line will collect potential difference signals at multiple times, and median filter the multiple potential difference signals collected by each signal detection unit to propose abnormal data points.

[0110] After extracting the net abnormal characteristic data from the normalized characteristic data using multiple background characteristic parameters, it is necessary to use the minimum normalized characteristic parameter to perform a subtraction operation on each net abnormal characteristic parameter in the net abnormal characteristic data, so as to eliminate the influence of DC bias. After eliminating DC bias, the intermediate characteristic data can be obtained, and the intermediate characteristic data will also include multiple intermediate characteristic parameters. Then, the gradient anomaly between the multiple intermediate characteristic parameters is determined, and the gradient anomaly data is formed to achieve the purpose of eliminating the steady-state interference in the fracturing process. The gradient anomaly data finally output can better reflect the signal change caused by the crack change. It should be noted that, although the gradient anomaly data obtained after the oil and gas fracturing crack monitoring data processing method of the embodiment of the present invention has a difference in actual size with the initial signal size, it can better reflect the signal change caused by the crack change, and because the operation process is a fixed change process, after obtaining the gradient anomaly data, it can be processed by introducing a proportional coefficient or adding a constant, etc. to perform proportional amplification and other processing. Therefore, the determination of the crack morphology can be achieved using gradient anomaly data.

[0111] In some embodiments of the present invention, normalizing multiple initial feature parameters in the initial feature data includes the following steps:

[0112] Each initial characteristic parameter is normalized using a normalized current value to obtain multiple normalized characteristic parameters, wherein the normalized current value is the current value of the AC excitation signal emitted by the transmitting system when the potential difference signal corresponding to the initial characteristic parameter is collected.

[0113] The normalized current value is the current value of the AC excitation signal emitted by the transmitting system at the time of collecting a set of potential difference signals used to obtain the initial characteristic parameters. After normalization processing using the normalized current value, the error caused by the current change can be eliminated.

[0114] In some embodiments of the present invention, the normalized characteristic parameter is calculated by the following formula:

[0115] U=V / I,

[0116] Where U is the normalized characteristic parameter, V is the initial characteristic parameter, and I is the normalized current value.

[0117] The method of using the normalized current value for normalization is relatively simple, and the above formula can be directly used to calculate each initial characteristic parameter in the initial characteristic data, so as to obtain corresponding multiple normalized characteristic parameters.

[0118] In some embodiments of the present invention, the background characteristic parameters are obtained by the following steps:

[0119] Acquire multiple background potential signals collected by the potential measurement line before fracturing begins;

[0120] A plurality of background characteristic parameters are obtained according to the plurality of background potential signals, and the plurality of background characteristic parameters correspond one to one to the plurality of initial characteristic data.

[0121] When the fracturing monitoring project is applied, data will be collected about half an hour before the start of fracturing. During this period, since no fracturing is carried out, the fracturing layer, environmental interference, and cultural interference are in a "relatively static" state. At this time, the multiple background potential signals collected by the potential measurement line can be used as the background field. The potential difference signal collected after the start of fracturing will inevitably include this part. By eliminating the influence of the background field, net abnormal data can be obtained. After the potential measurement line collects multiple background potential signals, the same method as that for obtaining the initial characteristic parameters can be used to process the multiple background potential signals, and the obtained parameters can be normalized to finally obtain multiple background characteristic parameters. It should be noted that in order to ensure the accuracy of the background field, the influence of abnormal data will be eliminated by means such as median filtering.

[0122] In some embodiments of the present invention, determining the gradient anomaly data corresponding to the intermediate feature data according to the intermediate feature data comprises the following steps:

[0123] Each intermediate characteristic parameter in each group of intermediate characteristic data is subtracted from the previous intermediate characteristic parameter to obtain a gradient anomaly characteristic parameter, and the obtained multiple gradient anomaly characteristic parameters are recorded as gradient anomaly data.

[0124] The gradient anomaly characteristic parameter can be obtained by subtracting the previous intermediate characteristic parameter from each intermediate characteristic parameter. It should be noted that for the annular potential measurement line, each potential measurement line is arranged in a ring, so each intermediate characteristic parameter can find the corresponding previous one. For multiple potential measurement lines arranged in a tic-tac-toe pattern, each potential measurement line has an endpoint, and there will inevitably be a problem that one endpoint cannot find the corresponding previous intermediate characteristic parameter. However, considering that in actual detection, the potential difference signal near the two ends of the potential measurement line itself will not change too much, therefore, the data can be directly eliminated or filled with data from adjacent positions.

[0125] In some embodiments of the present invention, initial characteristic data is acquired once according to the collected potential difference signal at a preset processing time interval, and a set of gradient anomaly data is confirmed according to the initial characteristic data. If the process is performed once at a certain time interval, the change of the gradient anomaly data caused by the change of the entire crack can be dynamically monitored, so that the dynamic change of the crack can be determined by using the gradient anomaly data, which is useful for real-time monitoring of the on-site fracturing situation.

[0126] The oil and gas fracturing crack height determination system according to the second embodiment of the present invention includes: a potential data acquisition unit, a characteristic parameter acquisition unit, a preprocessing unit, and a crack height determination unit.

[0127] A potential data acquisition unit is used to acquire a group of potential difference signals, each group of potential difference signals is acquired by a potential measurement line, the potential measurement line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each signal detection unit is used to acquire a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal;

[0128] A characteristic parameter acquisition unit, used for acquiring corresponding initial characteristic data according to the multiple potential difference signals, wherein the initial characteristic data includes multiple initial characteristic parameters stored in sequence, and the multiple initial characteristic parameters correspond to the multiple potential difference signals one by one;

[0129] A preprocessing unit is used to preprocess a plurality of initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are used to characterize the fracture height of the fracturing fluid swept body at the location where the corresponding signal detection unit is located;

[0130] The fracture height determination unit is used to determine the height information of the fracturing fluid swept body formed in the fracturing well in the area monitored by the corresponding potential measurement line according to multiple gradient anomaly characteristic parameters.

[0131] refer to Figures 1 to 12 , the potential measurement line usually includes a plurality of signal detection units arranged at equal intervals, and the length of the potential measurement line arrangement is usually long enough to ensure that the entire fracturing fluid affected body can be detected. When the fracturing well is fracturing, the AC excitation signal will be continuously transmitted to the fracturing well through the transmitting system, and the potential difference signal will be continuously collected through each signal detection unit. After the potential difference signal is collected, the initial characteristic parameters caused only by the crack change will be obtained from each potential difference signal. However, the initial characteristic parameters extracted at this time also contain the influence of many interference factors, so it is necessary to pre-process the initial characteristic parameters to obtain the gradient characteristic parameters. The initial characteristic parameters eliminate the influencing factors and only contain the characteristic values ​​corresponding to the crack change. Finally, multiple gradient abnormal characteristic parameters can be used to determine multiple height information, and the multiple height information corresponds to the height of the fracturing fluid affected body in the area where the different detection units are located. In actual engineering, by using a large number of potential measurement lines to complete the detection of more potential difference signals, the height information of the cracks formed by the entire fracturing well can be effectively determined. It should be noted that a relatively simple method can be used to determine the area of ​​the fracturing affected body. For example, there is a huge difference in the electric field when there are cracks and when there are no cracks in the same area. Therefore, the range of the fracturing fluid affected body can be directly determined by determining the area of ​​the electric field distribution of multiple potential measurement lines.

[0132] According to the oil and gas fracturing crack height determination system of the embodiment of the present invention, by laying out potential measuring lines, the potential difference signals of multiple continuous positions on the ground corresponding to the cracks can be collected, and then multiple initial characteristic parameters affected by the crack morphology can be obtained based on these potential difference signals, and by further preprocessing the initial characteristic parameters, the gradient abnormal characteristic parameters that can accurately correspond to the crack height are obtained, and finally the gradient abnormal characteristic parameters are used to quickly complete the determination of the crack height information. The oil and gas fracturing crack height determination system of the embodiment of the present invention can quickly determine the crack height information, thereby providing a basis for real-time crack monitoring and providing effective guidance for on-site, especially mining work.

[0133] According to the computer-readable storage medium of the embodiment of the third aspect of the invention, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the above-mentioned method for determining the height of oil and gas fracturing cracks.

[0134] According to the computer-readable storage medium of the embodiment of the present invention, the storage and transfer of computer-executable instructions can be facilitated through the storage medium.

[0135] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0136] Although the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those skilled in the art will understand that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for determining the height of oil and gas fracturing cracks, It is characterized in that The following steps are involved: Acquire a group of potential difference signals, each group of the potential difference signals is collected by a potential measuring line, the potential measuring line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each of the signal detection units is used to collect a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal; Acquire corresponding initial characteristic data according to the plurality of potential difference signals, wherein the initial characteristic data includes a plurality of initial characteristic parameters stored in sequence, and the plurality of initial characteristic parameters correspond one-to-one to the plurality of potential difference signals; Preprocessing a plurality of the initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are all used to characterize the fracture height of the fracturing fluid affected body corresponding to the position where the signal detection unit is located; Determine, according to a plurality of gradient anomaly characteristic parameters, height information of a fracturing fluid swept body formed by the fracturing well corresponding to the area monitored by the potential measuring line; The fracturing fluid affected body is equivalent to a first micro resistor-capacitor model consisting of a first equivalent resistor and a first equivalent capacitor connected in series; the stratum between the upper surface of the fracturing fluid affected body and the ground is equivalent to a second micro resistor-capacitor model, the second micro resistor-capacitor model includes a second equivalent resistor and a second equivalent capacitor connected in series, and a third equivalent capacitor connected in parallel with the second equivalent resistor; the first micro resistor-capacitor model and the second micro resistor-capacitor model are connected in series to form a fracturing monitoring electrical model; The method of determining the height information of the fracturing fluid affected body formed by the fracturing well corresponding to the area monitored by the potential measuring line according to the plurality of gradient anomaly characteristic parameters comprises the following steps: Based on the fracturing monitoring electrical model, the fracture height corresponding to the position of the signal detection unit is confirmed according to each of the gradient abnormality characteristic parameters, wherein the gradient abnormality characteristic parameter is inversely proportional to the fracture height.

2. The method for determining the height of oil and gas fracturing cracks according to claim 1, It is characterized in that The step of obtaining corresponding initial characteristic data according to the plurality of potential difference signals comprises the following steps: Performing signal conditioning on the potential difference signal collected by each of the signal detection units, and converting each of the potential difference signals after signal conditioning into a digital signal; Removing spike pulses from each of the digital signals, and performing digital filtering processing on each of the digital signals after the spike pulses are removed; Performing a deconvolution algorithm on each of the digital signals and the AC excitation signal after digital filtering to obtain a plurality of change data sets; A corresponding plurality of initial feature parameters are calculated according to the plurality of change data sets.

3. The method for determining the height of oil and gas fracturing cracks according to claim 2, It is characterized in that The step of calculating the corresponding multiple initial feature parameters according to the multiple change data sets comprises the following steps: An absolute value integration is performed on each of the change data sets, and the values ​​after the absolute value integration are averaged to obtain the corresponding initial characteristic parameters.

4. The method for determining the height of oil and gas fracturing cracks according to claim 1, It is characterized in that The preprocessing of the plurality of initial feature parameters in the initial feature data comprises the following steps: Normalizing the multiple initial feature parameters in the initial feature data to obtain corresponding normalized feature data, wherein the normalized feature data includes multiple normalized feature parameters corresponding one-to-one to the multiple initial feature parameters; Determine the minimum normalized feature parameter in the normalized feature data and record it as the minimum normalized feature parameter; Subtracting a corresponding preset background characteristic parameter from each of the normalized characteristic parameters in the normalized characteristic data to obtain net abnormal characteristic data, wherein the net abnormal characteristic data includes a plurality of net abnormal characteristic parameters corresponding one to one to the plurality of the normalized characteristic parameters; Subtracting the corresponding minimum normalized characteristic parameter from each of the net abnormal characteristic parameters in the net abnormal characteristic data to obtain intermediate characteristic data, wherein the intermediate characteristic data includes a plurality of intermediate characteristic parameters corresponding one-to-one to the plurality of the net abnormal characteristic parameters; The gradient anomaly data corresponding to the intermediate characteristic data is determined according to the intermediate characteristic data, and the gradient anomaly data is used to characterize the fracture morphology of the fracturing wave group formed in the fracturing well.

5. The method for determining the height of oil and gas fracturing cracks according to claim 4, It is characterized in that The normalizing process of the plurality of initial feature parameters in the initial feature data comprises the following steps: Each of the initial characteristic parameters is normalized using a normalized current value to obtain a plurality of normalized characteristic parameters, wherein the normalized current value is the current value of the AC excitation signal emitted by the transmitting system when the potential difference signal corresponding to the initial characteristic parameter is collected.

6. The method for determining the height of oil and gas fracturing cracks according to claim 4, It is characterized in that The background characteristic parameters are obtained by the following steps: Acquiring a plurality of background potential signals collected by the potential measuring line before the start of fracturing; A plurality of the background characteristic parameters are obtained according to the plurality of the background potential signals, and the plurality of the background characteristic parameters correspond one-to-one to the plurality of the initial characteristic data.

7. The method for determining the height of oil and gas fracturing cracks according to claim 4, It is characterized in that Determining the gradient anomaly data corresponding to the intermediate feature data according to the intermediate feature data comprises the following steps: Each intermediate characteristic parameter in each group of the intermediate characteristic data is subtracted from the previous intermediate characteristic parameter to obtain a gradient anomaly characteristic parameter, and the obtained multiple gradient anomaly characteristic parameters are recorded as the gradient anomaly data.

8. A system for determining the height of oil and gas fracturing cracks, It is characterized in that include: A potential data acquisition unit, used to acquire a group of potential difference signals, each group of the potential difference signals is acquired by a potential measurement line, the potential measurement line includes a plurality of signal detection units sequentially arranged on the surface above the fracturing well, each of the signal detection units is used to acquire a potential difference signal between the signal detection unit and the wellbore of the fracturing well when the transmitting system transmits an AC excitation signal; A characteristic parameter acquisition unit, used for acquiring corresponding initial characteristic data according to the plurality of potential difference signals, wherein the initial characteristic data comprises a plurality of initial characteristic parameters stored in sequence, and the plurality of initial characteristic parameters correspond one-to-one to the plurality of potential difference signals; A preprocessing unit, used for preprocessing a plurality of the initial characteristic parameters in the initial characteristic data to obtain a plurality of gradient anomaly characteristic parameters, wherein the plurality of gradient anomaly characteristic parameters are all used for characterizing the fracture height of the fracturing fluid swept body corresponding to the position where the signal detection unit is located; A fracture height determination unit, used to determine the height information of the fracturing fluid swept body formed by the fracturing well corresponding to the area monitored by the potential measurement line according to a plurality of gradient anomaly characteristic parameters; The fracturing fluid affected body is equivalent to a first micro resistor-capacitor model consisting of a first equivalent resistor and a first equivalent capacitor connected in series; the stratum between the upper surface of the fracturing fluid affected body and the ground is equivalent to a second micro resistor-capacitor model, the second micro resistor-capacitor model includes a second equivalent resistor and a second equivalent capacitor connected in series, and a third equivalent capacitor connected in parallel with the second equivalent resistor; the first micro resistor-capacitor model and the second micro resistor-capacitor model are connected in series to form a fracturing monitoring electrical model; The method of determining the height information of the fracturing fluid affected body formed by the fracturing well corresponding to the area monitored by the potential measuring line according to the plurality of gradient anomaly characteristic parameters comprises the following steps: Based on the fracturing monitoring electrical model, the fracture height corresponding to the position of the signal detection unit is confirmed according to each of the gradient abnormality characteristic parameters, wherein the gradient abnormality characteristic parameter is inversely proportional to the fracture height.

9. A computer-readable storage medium, Features: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute a method for determining the height of an oil and gas fracturing crack as described in any one of claims 1 to 7.

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