Method, device and equipment for determining optimal detection point of rescue well exploring tube and medium

Abstract

The invention provides a method, a device, equipment and a medium for determining an optimal detection point of a rescue well exploring tube, and belongs to the technical field of magnetic distance measurement positioning. The method comprises the following steps: acquiring a magnetic field signal of an accident well; the magnetic field signal of the accident well is matched with a pre-constructed rescue well magnetic distance measurement curve, and the optimal relative distance between a rescue well exploring pipe and an accident well casing pipe is determined; determining an optimal detection point of the rescue well exploring tube based on the optimal relative distance between the rescue well exploring tube and the accident well casing; and rescue well drilling work is executed based on the optimal detection point of the rescue well detection pipe. The pre-constructed rescue well magnetic distance measurement curve can accurately represent the relation between the optimal relative distance between the rescue well exploring tube and the accident well exploring tube and the accident well magnetic field signal, the detection precision of the magnetic distance measurement technology is improved, and therefore the success rate of rescue well drilling work is improved.

Description

Technical Field

[0001] The present invention relates to the field of magnetic ranging and positioning technology, and in particular to a method for determining an optimal detection point of a rescue well probe, a device for determining an optimal detection point of a rescue well probe, an electronic device and a readable storage medium. Background Art

[0002] Up to now, uncontrolled blowouts of oil and gas wells have been catastrophic events in drilling projects, and drilling rescue wells is currently the last relatively reliable technical measure to deal with uncontrolled blowout accidents. The precise positioning of the relative position between the rescue well and the accident well is the key to the success of the rescue well.

[0003] Magnetic ranging technology has high positioning accuracy. Active magnetic ranging technology based on the well-ground injection current method is used to locate the accident well itself to achieve the trajectory guidance of the rescue well. The detection principle of this method is to determine the distance and direction between the rescue well and the accident well by applying an excitation signal in the rescue well and detecting the response of the accident well to the excitation signal through the probe. Under ideal conditions, the excitation signal passes through the formation, and the convergent current generated by the casing of the accident well verifies the flow in the upper and lower directions at the same vertical depth of the transmitting electrode, and the current magnitude in both directions shows a trend of increasing first and then decreasing.

[0004] However, under actual conditions, uneven formations and rust on the accident well casing cause the amplitude and position of the extreme point of the accident well casing current to shift, resulting in the failure to accurately place the measuring probe near the extreme point, thereby reducing the detection accuracy of the active magnetic ranging system and further reducing the success rate of drilling rescue wells. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a method, device, equipment and medium for determining the best detection point of a rescue well probe, so as to solve the problem of low success rate of rescue well drilling.

[0006] In order to achieve the above object, an embodiment of the present invention provides a method for determining the best detection point of a rescue well probe, comprising:

[0007] Obtain the magnetic field signal of the accident well;

[0008] Matching the magnetic field signal of the accident well with the pre-constructed magnetic ranging curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic ranging curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing;

[0009] Based on the optimal relative distance between the rescue well probe and the accident well casing, determine the optimal detection point of the rescue well probe;

[0010] The rescue well drilling work is carried out based on the best detection point of the rescue well probe.

[0011] Optionally, the pre-constructed rescue well magnetic ranging curve is determined based on a rescue well magnetic ranging detection ground testing device; the rescue well magnetic ranging detection ground testing device includes:

[0012] Accident well casing, accident well tank, rescue well probe, rescue well tank, drilling fluid, support plate, sliding rheostat, transmitting electrode, return electrode, power supply, host and slide rail. ;

[0013] The accident well tank body, the rescue well tank body, the sliding rheostat, the power supply, the loop electrode and the slide rail are arranged on the support plate, the accident well casing is arranged inside the accident well tank body, the rescue well probe and the transmitting electrode are slidably connected on the slide rail, the slide rail is arranged inside the rescue well tank body, and the accident well tank body is filled with drilling fluid;

[0014] The power supply is connected to the host, the transmitting electrode and the loop electrode respectively, the rescue well probe is connected to the host, and the transmitting electrode is connected to the loop electrode through a sliding rheostat;

[0015] The host is used to set the parameters of the low-frequency alternating current signal;

[0016] The power supply is used to generate a corresponding low-frequency alternating current signal based on the parameters set by the host, and diffuse the low-frequency alternating excitation signal to the accident well casing through the transmitting electrode;

[0017] The accident well casing is used to generate a corresponding magnetic field signal in response to the low-frequency alternating current signal;

[0018] The rescue well probe is used to collect the magnetic field signal generated by the accident well casing and send the collected magnetic field signal to the host;

[0019] The slide rail is used to adjust the distance between the transmitting electrode and the rescue well probe.

[0020] Optionally, a pre-constructed rescue well magnetic ranging curve is obtained by:

[0021] By adjusting the rescue well magnetic distance detection ground test device, the accident well magnetic field signal under different relative distances between the rescue well probe and the accident well casing is generated, and a relative distance-accident well magnetic field signal curve is generated;

[0022] Using different filtering methods, the relative distance-accident well magnetic field signal curve is filtered to obtain the relative distance-accident well magnetic field signal curve under different filtering methods;

[0023] Based on the relative distance-accident well magnetic field signal curves under different filtering methods, the extreme value of the accident well magnetic field signal is determined;

[0024] Substitute the extreme value of the magnetic field signal of the accident well into the preset magnetic field model of the accident well casing to obtain the relative distance between the rescue well probe and the accident well casing;

[0025] If the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is not within the preset difference range, the rescue well magnetic ranging detection ground test device is adjusted to generate a new accident well magnetic field signal at a different distance between the transmitting electrode and the rescue well probe, and a new relative distance-accident well magnetic field signal curve is generated to update the current relative distance-accident well magnetic field signal curve, until the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is within the preset difference range, thereby obtaining a pre-constructed rescue well magnetic ranging curve.

[0026] Optionally, the preset accident well casing magnetic field model is:

[0027] Where H(z) represents the magnetic field signal of the accident well; u0 represents the vacuum conductivity; r represents the relative distance between the rescue well probe and the accident well casing; a c represents the inclination angle of the rescue well probe; L represents the distance between the rescue well probe and the transmitting electrode; r e It indicates that the resistivity of the accident well casing is equivalent to the radius of the cylinder of the homogeneous formation resistivity; I0 represents the low-frequency alternating current signal.

[0028] Optionally, the calculation rule for the radius of the cylinder whose casing resistivity of the accident well is equivalent to the resistivity of the homogeneous formation is:

[0029] Among them, r e The radius of the cylinder that represents the resistivity of the accident well casing equivalent to the resistivity of the homogeneous formation; σ c is the casing conductivity of the accident well; σ e is the formation conductivity; r c h is the casing radius of the accident well; c is the wall thickness of the accident well casing.

[0030] Optionally, different filtering methods are used to filter the relative distance-accident well magnetic field signal curve to obtain the relative distance-accident well magnetic field signal curve under different filtering methods, including:

[0031] Performing a cubic exponential smoothing filter process on the relative distance-accident well magnetic field signal curve to obtain a cubic exponential smoothing filter-processed relative distance-accident well magnetic field signal curve;

[0032] The relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filter is subjected to Gaussian filtering to obtain the relative distance-accident well magnetic field signal curve after Gaussian filtering.

[0033] Optionally, based on relative distance-accident well magnetic field signal curves under different filtering methods, determining the extreme value of the accident well magnetic field signal includes:

[0034] Based on the relative distance-accident well magnetic field signal curve after cubic exponential smoothing filtering and the relative distance-accident well magnetic field signal curve after Gaussian filtering, multiple common real number solutions are calculated;

[0035] The common real number solution in the interval where the slope under the relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filter is less than zero is determined as the target common real number solution;

[0036] The slope of the target common real number solution under the relative distance-accident well magnetic field signal curve after Gaussian filtering is determined, and the target common real number solution with a slope less than zero is determined as the extreme value of the accident well magnetic field signal.

[0037] In a second aspect of an embodiment of the present invention, a device for determining an optimal detection point of a rescue well probe is provided, comprising:

[0038] A data acquisition module, used to acquire magnetic field signals of the accident well;

[0039] A distance determination module is used to match the magnetic field signal of the accident well with the pre-constructed magnetic distance measurement curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic distance measurement curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing;

[0040] A detection point determination module is used to determine the best detection point of the rescue well probe based on the best relative distance between the rescue well probe and the accident well casing;

[0041] The execution module is used to execute the rescue well drilling work based on the best detection point of the rescue well probe.

[0042] In a third aspect of the embodiments of the present invention, an electronic device is provided, comprising: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the method for determining the optimal detection point of the rescue well probe pipe is performed.

[0043] In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, storing computer instructions, which, when executed on a computer, enable the computer to execute the above-mentioned method for determining the optimal detection point of the rescue well probe.

[0044] In this embodiment, the magnetic field signal of the accident well is obtained; the magnetic field signal of the accident well is matched with the pre-constructed rescue well magnetic ranging curve to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed rescue well magnetic ranging curve is used to characterize the mapping relationship between the accident well magnetic field signal and the relative distance between the rescue well probe and the accident well casing; based on the optimal relative distance between the rescue well probe and the accident well casing, the optimal detection point of the rescue well probe is determined; and the rescue well drilling work is performed based on the optimal detection point of the rescue well probe. The rescue well magnetic ranging curve pre-constructed by the present invention can accurately characterize the relationship between the optimal relative distance between the rescue well probe and the accident well probe and the accident well magnetic field signal, thereby improving the detection accuracy of the magnetic ranging technology and thus improving the success rate of the rescue well drilling work.

[0045] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0047] Figure 1 It is a flow chart of a method for determining an optimal detection point of a rescue well probe provided by an embodiment of the present invention;

[0048] Figure 2 It is a schematic diagram of the architecture of a ground test device for magnetic ranging detection of a rescue well provided by an embodiment of the present invention;

[0049] Figure 3 It is a schematic diagram of multi-physics field electromagnetic simulation of the EM module of Solidworks for the well-to-ground injection circuit method provided by an embodiment of the present invention;

[0050] Figure 4 It is a schematic diagram of a well-to-ground injection circuit method provided by an embodiment of the present invention in a multi-physics field electromagnetic simulation of Comsol;

[0051] Figure 5 It is a schematic diagram of current distribution in multi-physics field simulation of the well-to-ground injection circuit method provided by an embodiment of the present invention;

[0052] Figure 6 is a schematic diagram of the current density distribution of the casing of the accident well provided by an embodiment of the present invention;

[0053] Figure 7 is a schematic diagram of a relative distance-accident well magnetic field signal curve provided by an embodiment of the present invention;

[0054] Figure 8is a schematic diagram of a relative distance-accident well magnetic field signal curve after a cubic exponential smoothing filter process provided by an embodiment of the present invention;

[0055] Fig. 9 is a schematic diagram of a relative distance-accident well magnetic field signal curve after Gaussian filtering provided by an embodiment of the present invention;

[0056] Fig.10 is a schematic diagram of solving the extreme value of a magnetic field signal provided by an embodiment of the present invention;

[0057] Fig.11 It is a schematic diagram of the architecture of a device for determining an optimal detection point of a rescue well probe provided by an embodiment of the present invention.

[0058] Description of reference numerals:

[0059] 1. Support plate; 2. Power supply; 3. Host; 4. Rescue well tank;

[0060] 5. Emitting electrode; 6. Rescue well probe; 7. Drilling fluid; 8. Sliding rheostat;

[0061] 9. Accident well tank body; 10. Accident well casing; 11. Loop electrode. DETAILED DESCRIPTION

[0062] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0064] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0065] Embodiment 1

[0066] Reference Figure 1 , Figure 1 1 is a flow chart of a method for determining an optimal detection point of a rescue well probe provided by an embodiment of the present invention, the method comprising the following steps:

[0067] S100, obtaining a magnetic field signal of the accident well;

[0068] It should be noted that the method provided in the embodiment of the present invention can be applied to ground inversion software.

[0069] like Figure 2 As shown, the magnetic field signal of the accident well refers to the low-frequency alternating excitation signal applied to the transmitting electrode in the rescue well, and the accident well will return a magnetic field signal after receiving the low-frequency alternating excitation signal, and the magnetic field signal will be monitored by the probe in the rescue well.

[0070] S200, matching the magnetic field signal of the accident well with the pre-constructed magnetic ranging curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic ranging curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing;

[0071] The following describes in detail the construction process of the pre-constructed rescue well magnetic ranging curve:

[0072] In one embodiment, based on the determination of the rescue well magnetic ranging detection ground test device, the rescue well magnetic ranging detection ground test device includes: an accident well casing 10, an accident well tank body 9, a rescue well probe 6, a rescue well tank body 4, drilling fluid 7, a support plate 1, a sliding rheostat 8, an emission electrode 5, a return electrode 11, a power supply 2, a host 3 and a slide rail (not shown); the accident well tank body 9, the rescue well tank body 4, the sliding rheostat 8, the power supply 2, and the return electrode 11 are arranged on the support plate 1, the accident well casing 10 is arranged inside the accident well tank body 9, the rescue well probe 6 and the emission electrode 5 are slidably connected on the slide rail, the slide rail is arranged inside the rescue well tank body 4, and the accident well tank body 9 is filled with drilling fluid 7; the power supply 2 is respectively connected to the host 3, the transmitting electrode 5 and the loop electrode 11, the rescue well probe 6 is connected to the host 3, and the transmitting electrode 5 is connected to the loop electrode 11 through the sliding rheostat 8; the host 3 is used to set the parameters of the low-frequency alternating current signal; the power supply 2 is used to generate a corresponding low-frequency alternating current signal based on the parameters set by the host 3, and diffuse the low-frequency alternating excitation signal to the accident well casing 10 through the transmitting electrode; the accident well casing 10 is used to respond to the low-frequency alternating current signal and generate a corresponding magnetic field signal; the rescue well probe 6 is used to collect the magnetic field signal generated by the accident well casing 10, and send the collected magnetic field signal to the host 3; the slide rail is used to adjust the distance between the transmitting electrode 5 and the rescue well probe 6.

[0073] In one embodiment, the host 3 is connected to the power supply 2 via a 485 communication cable.

[0074] In one embodiment, a well-to-ground data transmission module of power line carrier technology is provided on the host 3, and the rescue well probe 6 is connected to the well-to-ground data transmission module of power line carrier technology. In addition, after receiving the rescue well magnetic field signal sent by the rescue well probe 6, the host 3 will decode it through the well-to-ground data transmission module of power line carrier technology and convert it into a recognizable digital signal.

[0075] In one embodiment, the drilling fluid 7 is a NaCl solution, and drilling fluids with different conductivities can be adjusted by adjusting the concentration of the NaCl solution.

[0076] In one embodiment, the driving mode of the slide rail can be implemented by servo electrode driving.

[0077] In one embodiment, if Figure 2 As shown, the power supply 2 is connected to the accident well casing 10, the rescue well probe 6, the sliding rheostat 8, the transmitting electrode 5, the loop electrode 11 and the host 3 through a seven-core cable. The specific connection method is that the five-core cable in the seven-core cable is connected to the transmitting electrode 5, and then the five-core cable is connected to the five sliding rheostats 8 respectively, and then the five-core cable is connected to the rescue well probe 6 and then connected to the loop electrode 11, and finally the loop electrode 11 is connected to the power supply 2, and the other two-core cables are connected to the transmitting electrode 5 and the host 3.

[0078] After determining the ground test device for the rescue well magnetic ranging detection, the pre-constructed rescue well magnetic ranging curve is obtained by the following method:

[0079] S210, by adjusting the rescue well magnetic distance detection ground test device, generating the accident well magnetic field signal under different relative distances between the rescue well probe and the accident well casing, and generating a relative distance-accident well magnetic field signal curve;

[0080] The magnetic field signal of the accident well has been mentioned above. Here we introduce how to obtain the magnetic field signal of the accident well by starting the rescue well magnetic ranging detection ground test device:

[0081] Step 1: Set up the accident well casing 10, the accident well tank 9, the rescue well probe 6, the rescue well tank 4, the drilling fluid 7, the support plate 1, the sliding rheostat 8, the transmitting electrode 5, the return electrode 11, the power supply 2 and the host 3 according to the above connection relationship;

[0082] Step 2: Turn on the power supply 2 to generate a low-frequency alternating excitation signal, and set the excitation signal parameters through the host 3; the parameters include: frequency, voltage and current;

[0083] Step 3: Send the set low-frequency alternating excitation signal to the transmitting electrode 5. After reaching the transmitting electrode, the transmitting electrode diffuses the low-frequency alternating excitation signal to the accident well casing through the cable and the sliding rheostat 8, and finally generates a convergent current in the accident well casing; wherein the sliding rheostat is used to simulate the formation conductivity;

[0084] Step 4: Under the action of the low-frequency alternating excitation signal, the accident well casing will reflect the magnetic field signal after receiving the low-frequency alternating excitation signal, and the magnetic field signal will be collected by the rescue well probe, and then the rescue well probe will send the collected magnetic field signal to the host 3, and then the host 3 will decode the collected magnetic field signal and convert it into a recognizable digital signal.

[0085] S220, using different filtering methods to filter the relative distance-accident well magnetic field signal curve to obtain the relative distance-accident well magnetic field signal curve under different filtering methods;

[0086] It should be noted that if Figure 7 As shown, since the actually collected accident well magnetic field signal will be affected by the environment and the sensor, there will be interference of varying degrees, so it is necessary to filter the relative distance-accident well magnetic field signal curve.

[0087] In one embodiment, step S220 may be implemented by the following steps:

[0088] S221, performing a cubic exponential smoothing filter process on the relative distance-accident well magnetic field signal curve to obtain a cubic exponential smoothing filter-processed relative distance-accident well magnetic field signal curve;

[0089] The specific form is as follows:

[0090] S 1 (t+1)=αM(t)+(1-α)S 1 (t);

[0091] S 2 (t+1)=αS 1 (t)+(1-α)S 2 (t)

[0092] S 3 (t+1)=αS 2 (t)+(1-α)S 3 (t);

[0093] Among them, S 1 (t+1) represents the smoothed value at time t+1; M(t) represents the magnetic field value collected at time t; S 1 (t) represents the smoothed value at time t; S 2(t+1) represents the secondary smoothing value at time t+1; S 3 (t+1) represents the cubic smoothing value at time t+1.

[0094] Its prediction function is as follows:

[0095]

[0096] like Figure 8 As shown in the figure, this figure is a schematic diagram of the relative distance-accident well magnetic field signal curve after triple exponential smoothing filtering.

[0097] S222, performing Gaussian filtering on the relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filtering process to obtain the relative distance-accident well magnetic field signal curve after Gaussian filtering.

[0098] The specific form is as follows: Where N represents the data sliding window size.

[0099] like Fig. 9 As shown, this figure is a schematic diagram of the relative distance-accident well magnetic field signal curve after the relative distance-accident well magnetic field signal curve after Gaussian filtering after the relative distance-accident well magnetic field signal curve after cubic exponential smoothing filtering.

[0100] S230 determines the extreme value of the magnetic field signal of the accident well based on the relative distance-magnetic field signal curve of the accident well under different filtering methods;

[0101] In one embodiment, step S230 may be implemented by the following steps:

[0102] S231, calculating multiple common real number solutions based on the relative distance-accident well magnetic field signal curve after cubic exponential smoothing filtering and the relative distance-accident well magnetic field signal curve after Gaussian filtering;

[0103] S232, determining the common real number solution in the interval where the slope under the relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filter is less than zero as the target common real number solution;

[0104] S233, determining the slope of the target common real number solution under the relative distance-accident well magnetic field signal curve after Gaussian filtering, and determining the target common real number solution with a slope less than zero as the extreme value of the accident well magnetic field signal.

[0105] Specifically, Fig.10 As shown, there are multiple intersections between the relative distance-accident well magnetic field signal curve after cubic exponential smoothing filtering and the relative distance-accident well magnetic field signal curve after Gaussian filtering.

[0106] Let's zoom in on one of the intersections for an example: we can see that there are two intersections in the zoomed in image, of which the intersection close to the Gaussian filter peak shows a downward trend in both the relative distance-accident well magnetic field signal curve after triple exponential smoothing filtering and the relative distance-accident well magnetic field signal curve after Gaussian filtering, while the other point shows an upward and then downward trend in the relative distance-accident well magnetic field signal curve after triple exponential smoothing filtering, and we take the former as the extreme value of the accident well magnetic field signal. The intersections at other locations are analyzed according to the same logic, and finally multiple extreme values ​​of the accident well magnetic field signal can be determined.

[0107] S240, substituting the extreme value of the magnetic field signal of the accident well into a preset magnetic field model of the casing of the accident well to obtain the relative distance between the rescue well probe and the casing of the accident well;

[0108] Specifically, the preset magnetic field model of the accident well casing is: Where H(z) represents the magnetic field signal of the accident well; u0 represents the vacuum conductivity; r represents the relative distance between the rescue well probe and the accident well casing; a c represents the inclination angle of the rescue well probe; L represents the distance between the rescue well probe and the transmitting electrode; r e It indicates that the resistivity of the accident well casing is equivalent to the radius of the cylinder of the homogeneous formation resistivity; I0 represents the low-frequency alternating current signal.

[0109] In one embodiment, the calculation rule of the radius of the cylinder whose casing resistivity of the accident well is equivalent to the resistivity of the homogeneous formation is: Among them, r e The radius of the cylinder that represents the resistivity of the accident well casing equivalent to the resistivity of the homogeneous formation; σ c is the casing conductivity of the accident well; σ e is the formation conductivity; r c h is the casing radius of the accident well; c is the wall thickness of the accident well casing.

[0110] The following is a principle description of the preset accident well casing magnetic field model:

[0111] It is understandable that the current model of the accident well at different well depths derived from classical electromagnetics. According to its numerical simulation, it can be confirmed that the current has a trend of increasing first and then decreasing in both the upward and downward directions along the casing. For details, please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6The current distribution based on different schemes is given. Therefore, based on the principle of classical electromagnetics, the relationship between the current of the accident well casing and the inclination angle of the rescue well probe, the distance between the transmitting electrode and the rescue well probe, the relative distance between the rescue well probe and the accident well casing, the radius of the accident well casing and the low-frequency alternating current signal is established to obtain the accident well casing current attenuation model. The accident well casing current attenuation model is: Where I(z) represents the magnetic field signal of the accident well; L represents the distance between the rescue well probe and the transmitting electrode; r e Indicates the radius of the accident well casing; a c Indicates the inclination angle of the rescue well probe.

[0112] Then, since we need to establish the relationship between the magnetic field signal of the accident well and the distance between the rescue well probe and the transmitting electrode, after obtaining the relationship between the accident well casing current and the distance between the rescue well probe and the transmitting electrode, we can establish the relationship between the magnetic field signal of the accident well and the vacuum conductivity and the accident well casing current attenuation model based on the Biot-Savart theorem to obtain the accident well casing magnetic field model. The accident well casing magnetic field model is: H(z) represents the magnetic field signal of the accident well; u0 represents the vacuum conductivity.

[0113] like Figure 2 As shown in the figure, after the rescue well magnetic ranging detection ground test device is built, a series of model construction parameters required for the preset accident well casing magnetic field model can be obtained, such as the inclination angle of the rescue well probe, the radius of the accident well casing, the distance between the transmitting electrode and the rescue well probe, the radius of the accident well casing, the low-frequency alternating current signal, the current of the accident well casing, the accident well magnetic field signal and vacuum conductivity.

[0114] The low-frequency alternating current signal is a low-frequency alternating excitation signal generated after the power supply 2 is turned on; wherein the parameters of the low-frequency alternating excitation signal include: frequency, voltage and current.

[0115] S250, if the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is not within the preset difference range, then by adjusting the rescue well magnetic ranging detection ground test device, a new accident well magnetic field signal under a different distance between the transmitting electrode and the rescue well probe is generated, and a new relative distance-accident well magnetic field signal curve is generated to update the current relative distance-accident well magnetic field signal curve, until the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is within the preset difference range, and a pre-constructed rescue well magnetic ranging curve is obtained.

[0116] The preset distance refers to the optimal relative distance between the rescue well probe and the accident well casing measured by a laser ranging instrument.

[0117] In this embodiment, the preset difference is not specifically limited and can be reasonably set according to actual needs. In addition, the preset difference can be a positive or negative value, for example: ±5m.

[0118] Specifically, the distance between the transmitting electrode and the rescue well probe is adjusted by the slide rail, and then a new accident well magnetic field signal is generated at a different distance between the transmitting electrode and the rescue well probe. If the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is not within the preset difference range, the distance between the transmitting electrode and the rescue well probe is reduced by 20%.

[0119] For example: the first adjustment: the distance between the transmitting electrode and the rescue well probe is 10m, which is reduced by 20% to 10-(10x20%)=8m; the second adjustment: the distance between the transmitting electrode and the rescue well probe is 8m, which is reduced by 20% to 8-(8x20%)=6.4m.

[0120] S300, determining an optimal detection point of the rescue well probe based on an optimal relative distance between the rescue well probe and the accident well casing;

[0121] Specifically, after determining the optimal relative distance between the rescue well probe and the accident well casing, the position of the rescue well probe can be determined, and the position is used as the optimal detection point of the rescue well probe.

[0122] S400: drilling a rescue well based on the best detection point of the rescue well probe.

[0123] In this embodiment, the magnetic field signal of the accident well is obtained; the magnetic field signal of the accident well is matched with the pre-constructed rescue well magnetic ranging curve to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed rescue well magnetic ranging curve is used to characterize the mapping relationship between the accident well magnetic field signal and the relative distance between the rescue well probe and the accident well casing; based on the optimal relative distance between the rescue well probe and the accident well casing, the optimal detection point of the rescue well probe is determined; and the rescue well drilling work is performed based on the optimal detection point of the rescue well probe. The rescue well magnetic ranging curve pre-constructed by the present invention can accurately characterize the relationship between the optimal relative distance between the rescue well probe and the accident well probe and the accident well magnetic field signal, thereby improving the detection accuracy of the magnetic ranging technology and thus improving the success rate of the rescue well drilling work.

[0124] Embodiment 2

[0125] Please refer to Fig.11 , Fig.11 1 is a schematic diagram of the structure of a device for determining the optimal detection point of a rescue well probe provided by an embodiment of the present application. The device 200 for determining the optimal detection point of a rescue well probe comprises:

[0126] The data acquisition module 210 is used to acquire the magnetic field signal of the accident well;

[0127] The distance determination module 220 is used to match the magnetic field signal of the accident well with the pre-constructed magnetic distance measurement curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic distance measurement curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing;

[0128] A detection point determination module 230, for determining an optimal detection point of the rescue well probe based on an optimal relative distance between the rescue well probe and the accident well casing;

[0129] The execution module 240 is used to execute the rescue well drilling work based on the best detection point of the rescue well probe.

[0130] It should be understood that the device corresponds to the above-mentioned method embodiment for determining the optimal detection point of the rescue well probe, and can execute the various steps involved in the above-mentioned method embodiment. The specific functions of the device can be found in the above description. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device.

[0131] Embodiment 3

[0132] Based on the same inventive concept, an embodiment of the present invention also provides an electronic device, including: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the above-mentioned method for determining the optimal detection point of the rescue well probe pipe is executed.

[0133] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0134] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0135] Embodiment 4

[0136] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium storing computer instructions, wherein when the computer instructions are executed on a computer, the computer executes the above-mentioned method for determining the optimal detection point of the rescue well probe.

[0137] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0138] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0139] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0140] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0141] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0142] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0143] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0144] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining the best detection point of a rescue well probe, characterized in that: include: Obtain the magnetic field signal of the accident well; Matching the magnetic field signal of the accident well with the pre-constructed magnetic ranging curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic ranging curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing; Based on the optimal relative distance between the rescue well probe and the accident well casing, determine the optimal detection point of the rescue well probe; The rescue well drilling work is carried out based on the best detection point of the rescue well probe.

2. The method for determining the best detection point of the rescue well probe according to claim 1, characterized in that: The pre-constructed rescue well magnetic ranging curve is determined based on a rescue well magnetic ranging detection ground test device; the rescue well magnetic ranging detection ground test device includes: Accident well casing, accident well tank, rescue well probe, rescue well tank, drilling fluid, support plate, sliding rheostat, transmitting electrode, return electrode, power supply, host and slide rail. ; The accident well tank body, the rescue well tank body, the sliding rheostat, the power supply, the loop electrode and the slide rail are arranged on the support plate, the accident well casing is arranged inside the accident well tank body, the rescue well probe and the transmitting electrode are slidably connected on the slide rail, the slide rail is arranged inside the rescue well tank body, and the accident well tank body is filled with drilling fluid; The power supply is connected to the host, the transmitting electrode and the loop electrode respectively, the rescue well probe is connected to the host, and the transmitting electrode is connected to the loop electrode through a sliding rheostat; The host is used to set the parameters of the low-frequency alternating current signal; The power supply is used to generate a corresponding low-frequency alternating current signal based on the parameters set by the host, and diffuse the low-frequency alternating excitation signal to the accident well casing through the transmitting electrode; The accident well casing is used to generate a corresponding magnetic field signal in response to the low-frequency alternating current signal; The rescue well probe is used to collect the magnetic field signal generated by the accident well casing and send the collected magnetic field signal to the host; The slide rail is used to adjust the distance between the transmitting electrode and the rescue well probe.

3. The method for determining the best detection point of the rescue well probe according to claim 2, characterized in that: The pre-built rescue well magnetic ranging curve is obtained by: By adjusting the rescue well magnetic distance detection ground test device, the accident well magnetic field signal under different relative distances between the rescue well probe and the accident well casing is generated, and a relative distance-accident well magnetic field signal curve is generated; Using different filtering methods, the relative distance-accident well magnetic field signal curve is filtered to obtain the relative distance-accident well magnetic field signal curve under different filtering methods; Based on the relative distance-accident well magnetic field signal curves under different filtering methods, the extreme value of the accident well magnetic field signal is determined; Substitute the extreme value of the magnetic field signal of the accident well into the preset magnetic field model of the accident well casing to obtain the relative distance between the rescue well probe and the accident well casing; If the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is not within the preset difference range, the rescue well magnetic ranging detection ground test device is adjusted to generate a new accident well magnetic field signal at a different distance between the transmitting electrode and the rescue well probe, and a new relative distance-accident well magnetic field signal curve is generated to update the current relative distance-accident well magnetic field signal curve, until the difference between the relative distance between the rescue well probe and the accident well casing and the preset distance is within the preset difference range, thereby obtaining a pre-constructed rescue well magnetic ranging curve.

4. The method for determining the best detection point of the rescue well probe according to claim 3, characterized in that: The preset magnetic field model of the accident well casing is: Where H(z) represents the magnetic field signal of the accident well; u0 represents the vacuum conductivity; r represents the relative distance between the rescue well probe and the accident well casing; a c represents the inclination angle of the rescue well probe; L represents the distance between the rescue well probe and the transmitting electrode; r e It indicates that the resistivity of the accident well casing is equivalent to the radius of the cylinder of the homogeneous formation resistivity; I0 represents the low-frequency alternating current signal.

5. The method for determining the best detection point of the rescue well probe according to claim 4, characterized in that: The calculation rule for the radius of the cylinder whose casing resistivity of the accident well is equivalent to the resistivity of the homogeneous formation is: Among them, r e The radius of the cylinder that represents the resistivity of the accident well casing equivalent to the resistivity of the homogeneous formation; σ c is the casing conductivity of the accident well; σ e is the formation conductivity; r c h is the casing radius of the accident well; c is the wall thickness of the accident well casing.

6. The method for determining the best detection point of the rescue well probe according to claim 3, characterized in that: Different filtering methods are used to filter the relative distance-accident well magnetic field signal curve to obtain the relative distance-accident well magnetic field signal curve under different filtering methods, including: Performing a cubic exponential smoothing filter process on the relative distance-accident well magnetic field signal curve to obtain a cubic exponential smoothing filter-processed relative distance-accident well magnetic field signal curve; The relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filter is subjected to Gaussian filtering to obtain the relative distance-accident well magnetic field signal curve after Gaussian filtering.

7. The method for determining the best detection point of the rescue well probe according to claim 6, characterized in that: Based on the relative distance-accident well magnetic field signal curves under different filtering methods, the extreme value of the accident well magnetic field signal is determined, including: Based on the relative distance-accident well magnetic field signal curve after cubic exponential smoothing filtering and the relative distance-accident well magnetic field signal curve after Gaussian filtering, multiple common real number solutions are calculated; The common real number solution in the interval where the slope under the relative distance-accident well magnetic field signal curve after the cubic exponential smoothing filter is less than zero is determined as the target common real number solution; The slope of the target common real number solution under the relative distance-accident well magnetic field signal curve after Gaussian filtering is determined, and the target common real number solution with a slope less than zero is determined as the extreme value of the accident well magnetic field signal.

8. A device for determining the best detection point of a rescue well probe, characterized in that: include: A data acquisition module, used to acquire magnetic field signals of the accident well; A distance determination module is used to match the magnetic field signal of the accident well with the pre-constructed magnetic distance measurement curve of the rescue well to determine the optimal relative distance between the rescue well probe and the accident well casing; wherein the pre-constructed magnetic distance measurement curve of the rescue well is used to characterize the mapping relationship between the magnetic field signal of the accident well and the relative distance between the rescue well probe and the accident well casing; A detection point determination module is used to determine the best detection point of the rescue well probe based on the best relative distance between the rescue well probe and the accident well casing; The execution module is used to execute the rescue well drilling work based on the best detection point of the rescue well probe.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the method for determining the optimal detection point of a rescue well probe pipe according to any one of claims 1 to 7 is executed.

10. A computer-readable storage medium storing computer instructions, characterized in that: When the computer instructions are executed on a computer, the computer is enabled to execute the method for determining the optimal detection point of a rescue well probe according to any one of claims 1 to 7.

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