A method, device, equipment and storage medium for borehole endoscopic scanning imaging

Abstract

This text provides a method, device, equipment, and storage medium for borehole endoscopic scanning imaging. The method for borehole endoscopic scanning imaging includes: transmitting detection signals to the wellbore wall at different positions within the borehole; receiving echo signals at corresponding positions within the borehole; obtaining the echo time differences and echo amplitudes at each position based on the detection signals and echo signals at each position; and performing imaging of the inner wall of the borehole according to the transmission positions of the detection signals and the echo time differences and echo amplitudes corresponding to the transmission positions. This text detects the inner wall of the borehole through ultrasonic signals, which has a wider scope of application. Moreover, through borehole endoscopic scanning, high-resolution borehole information is imaged, providing technical support and decision-making basis for key issues such as real-time analysis of wellbore stability during oil and gas resource drilling and development, real-time adjustment of horizontal wellbore trajectories, well pattern deployment for horizontal well drilling, and reservoir fracturing reconstruction.

Description

Technical Field

[0001] The present invention relates to the field of drilling exploration, and in particular, to a method, device, equipment and storage medium for borehole inner wall endoscopic scanning imaging. Background Art

[0002] Borehole inner wall endoscopic scanning imaging technology can not only reflect the borehole geometry in open-hole wells, identify formation heterogeneities such as fractures, holes, bedding planes, etc., but also inspect the perforation quality, analyze casing damage and evaluate cementing quality in cased wells.

[0003] Existing borehole inner wall endoscopic scanning imaging all utilizes the measurement principle of resistivity, and realizes high-precision borehole wall detection by detecting the conductivity or resistivity of the medium. However, the measurement based on resistivity in the prior art is affected by the conductive characteristics of drilling fluid and can only be applied to the measurement of water-based mud, and is not applicable to the measurement of oil-based mud. Therefore, there is an urgent need for a borehole inner wall endoscopic scanning imaging method that can be widely applicable to the borehole wall detection of different drilling fluids without being limited by the conductive characteristics of drilling fluid. Summary of the Invention

[0004] The purpose of the embodiments of this article is to provide a method, device, equipment and storage medium for borehole inner wall endoscopic scanning imaging to detect the borehole wall with high adaptability.

[0005] To achieve the above purpose, on the one hand, the embodiments of this article provide a method for borehole inner wall endoscopic scanning imaging, including:

[0006] Transmitting detection signals to the borehole wall at different positions in the borehole;

[0007] Receiving echo signals at corresponding positions in the borehole;

[0008] Obtaining the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position;

[0009] Performing borehole inner wall imaging according to the emission positions of the detection signals and the echo time difference and echo amplitude corresponding to the emission positions.

[0010] Preferably, the step of transmitting detection signals to the borehole wall at different positions in the borehole further includes:

[0011] Installing an ultrasonic transducer on the drill collar, and driving the ultrasonic transducer to be lowered into the borehole by the drill collar;

[0012] When the ultrasonic transducer is lowered to different positions in the borehole, it emits detection signals.

[0013] Preferably, the step of obtaining the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position further includes:

[0014] According to the difference between the emission time corresponding to the detection signal at each position and the echo time corresponding to the echo signal, the echo time difference at each position is obtained;

[0015] Preprocess the echo signals at each position to obtain the echo amplitudes at each position.

[0016] Preferably, the preprocessing of the echo signals at each position to obtain the echo amplitudes at each position further includes:

[0017] Filter out the noise in the echo signals at each position;

[0018] Compare the similarity between the denoised echo signals at each position and their corresponding detection signals, and screen out the echo signal segments with the highest similarity at each position;

[0019] According to the well diameter measurement values at each position in the wellbore, adjust the amplitudes of the echo signal segments screened out at the corresponding positions to obtain the echo amplitudes at each position.

[0020] Preferably, the comparison of the similarity between the denoised echo signals at each position and their corresponding detection signals, and screening out the echo signal segments with the highest similarity at each position further includes:

[0021] Based on the signal length of the detection signal, divide the denoised echo signal into several segments;

[0022] Amplify each segment of the echo signal so that the amplitude of each amplified echo signal is the same as the amplitude of the detection signal;

[0023] Determine the cumulative amplitude deviation value between the detection signal and each amplified echo signal segment;

[0024] Determine the echo signal segment with the smallest cumulative amplitude deviation value as the echo signal segment with the highest similarity.

[0025] Preferably, the method for determining the well diameter measurement values at each position in the wellbore includes:

[0026] According to the corresponding relationship between the environmental parameters and the signal propagation speed, and the environmental parameters at each position, determine the signal propagation speed at each position;

[0027] According to the signal propagation speed at each position and the echo time difference at the corresponding position, obtain the well diameter measurement values at each position.

[0028] Preferably, the adjustment of the amplitudes of the echo signal segments screened out at the corresponding positions according to the well diameter measurement values at each position in the wellbore to obtain the echo amplitudes at each position further includes:

[0029] Compare the well diameter measurement value at each position with the theoretical well diameter value at that position;

[0030] If the measured wellbore diameter value at this position is greater than the theoretical wellbore diameter value at this position, a preset value is added to the current amplitude value of the echo signal segment to obtain the echo amplitude at this position, where the preset value is the amplitude difference between the measured wellbore diameter value and the theoretical wellbore diameter value at this position;

[0031] If the measured wellbore diameter value at this position is less than the theoretical wellbore diameter value at this position, the preset value is subtracted from the current amplitude value of the echo signal segment to obtain the echo amplitude at this position.

[0032] On the other hand, an embodiment of the present invention provides a device for borehole endoscopic scanning imaging, the device includes:

[0033] A signal transmitting device, configured to transmit detection signals to the wellbore wall at different positions in the wellbore;

[0034] A signal receiving device, configured to receive echo signals at corresponding positions in the wellbore;

[0035] A processing device, configured to obtain the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position; and perform imaging of the inner wall of the wellbore according to the emission positions of the detection signals and the corresponding echo time differences and echo amplitudes.

[0036] On another aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory. When the computer program is run by the processor, it executes the instructions of the method described in any one of the above.

[0037] On another aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by the processor of a computer device, it executes the instructions of the method described in any one of the above.

[0038] As can be seen from the technical solutions provided by the embodiments of the present invention above, the embodiments of the present invention detect echo signals after transmitting detection signals at different positions in the wellbore, and further obtain the echo time difference and echo amplitude at each position. Imaging is performed in a coordinate system through the emission position, the corresponding echo time difference and echo amplitude at this emission position to obtain the fracture condition of the inner wall of the wellbore. Since the propagation of the detection signal is not restricted by water-based mud and oil-based mud, the detection signal has a wider applicable range. Moreover, through borehole endoscopic scanning, high-resolution wellbore information is imaged, which can provide technical support and decision-making basis for key issues such as real-time analysis of wellbore stability, real-time adjustment of horizontal wellbore trajectories, well pattern deployment in horizontal well drilling, and reservoir fracturing reconstruction during the drilling and development of oil and gas resources.

[0039] To make the above and other objectives, features, and advantages of this article more obvious and understandable, the following provides preferred embodiments and, in conjunction with the accompanying drawings, gives a detailed description as follows. Brief Description of the Drawings

[0040] To more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this article. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 Shows a schematic flow chart of a method for borehole endoscopic scanning imaging provided by an embodiment of this article;

[0042] Figure 2 Shows a schematic flow chart of transmitting detection signals to the wellbore wall at different positions in the borehole provided by an embodiment of this article;

[0043] Figure 3 Shows a cross-sectional view of a drill collar provided by an embodiment of this article;

[0044] Figure 4 Shows a schematic flow chart of obtaining the echo time difference and echo amplitude at each position provided by an embodiment of this article;

[0045] Figure 5 Shows a sound field distribution diagram provided by an embodiment of this article;

[0046] Figure 6 Shows a further schematic flow chart of obtaining the echo amplitude at each position provided by an embodiment of this article;

[0047] Figure 7 Shows a schematic flow chart of determining the echo signal segment provided by an embodiment of this article;

[0048] Figure 8 Shows a schematic flow chart of amplifying each segment of the echo signal provided by an embodiment of this article;

[0049] Figure 9 Shows a further schematic flow chart of determining the echo signal segment provided by an embodiment of this article;

[0050] Figure 10 Shows a schematic flow chart of determining the well diameter measurement value provided by an embodiment of this article;

[0051] Figure 11 Shows a schematic flow chart of adjusting the amplitude of the echo signal segment to obtain the echo amplitude provided by an embodiment of this article;

[0052] Figure 12The figure shows a schematic diagram of the determination process of the preset value provided by the embodiments of the present disclosure;

[0053] Figure 13 The figure shows a schematic diagram of the module structure of a device for borehole endoscopic scanning imaging provided by the embodiments of the present disclosure;

[0054] Figure 14 The figure shows a schematic diagram of the structure of a computer device provided by the embodiments of the present disclosure.

[0055] Description of the reference numerals in the drawings:

[0056] 100, signal transmitting device;

[0057] 200, signal receiving device;

[0058] 300, processing device;

[0059] 1402, computer device;

[0060] 1404, processor;

[0061] 1406, memory;

[0062] 1408, drive mechanism;

[0063] 1410, input / output module;

[0064] 1412, input device;

[0065] 1414, output device;

[0066] 1416, presentation device;

[0067] 1418, graphical user interface;

[0068] 1420, network interface;

[0069] 1422, communication link;

[0070] 1424, communication bus. Detailed implementation manners

[0071] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0072] Existing wellbore endoscopic scanning imaging all utilizes the measurement principle of resistivity. By detecting the conductivity or resistivity of the medium, high-precision wellbore detection is achieved. However, in the existing technology, the measurement based on resistivity is affected by the conductive characteristics of the drilling fluid and can only be applied to the measurement of water-based mud, and is not applicable to the measurement of oil-based mud. Therefore, there is an urgent need for a wellbore endoscopic scanning imaging method that can be independent of the conductive characteristics of the drilling fluid and is widely applicable to the wellbore detection of different drilling fluids.

[0073] To solve the above problems, the embodiments of this article provide a wellbore endoscopic scanning imaging method that can detect the wellbore with high adaptability. Figure 1 It is a schematic diagram of the steps of a wellbore endoscopic scanning imaging method provided by the embodiments of this article. This specification provides the method operation steps as described in the embodiments or flowcharts, but based on routine or non-creative labor, more or fewer operation steps may be included. The step order listed in the embodiments is only one way among the execution orders of numerous steps and does not represent the only execution order. When the actual system or device product is executed, it can be executed in the method order shown in the embodiments or the drawings or executed in parallel.

[0074] Refer to Figure 1 , a wellbore endoscopic scanning imaging method, including:

[0075] S101: Transmit detection signals to the wellbore wall at different positions in the wellbore;

[0076] S102: Receive echo signals at corresponding positions in the wellbore;

[0077] S103: Obtain the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position;

[0078] S104: Perform imaging of the inner wall of the wellbore according to the emission positions of the detection signals and the echo time difference and echo amplitude corresponding to the emission positions.

[0079] In the embodiments of this article, the detection signal can be an ultrasonic signal. The ultrasonic signal has a fast propagation speed and is not restricted by the propagation medium, and can perform real-time detection of the wellbore wall in the wellbore. Since the propagation of the ultrasonic signal is not restricted by water-based mud and oil-based mud, the detection range is wider through the ultrasonic signal detection. After receiving the echo signal through ultrasonic detection, the echo time difference and echo amplitude at each position are further obtained. Through the emission position, the echo time difference and echo amplitude corresponding to the emission position, the crack condition of the inner wall of the wellbore can be obtained after imaging.

[0080] Ultrasonic waves can be emitted through an ultrasonic transducer. The ultrasonic transducer can not only emit ultrasonic signals but also receive echo signals. Specifically, refer to Figure 2, the step of transmitting detection signals to the wellbore wall at different positions in the wellbore further includes:

[0081] S201: Install an ultrasonic transducer on the drill collar, and drive the ultrasonic transducer to lower it into the wellbore by the drill collar;

[0082] S202: When the ultrasonic transducer is lowered to different positions in the wellbore, transmit detection signals.

[0083] In the embodiment of the present invention, the drill collar is a tool for drilling. The ultrasonic transducer is installed on the drill collar and can reach different positions in the wellbore during the drilling process along with the drill collar, and then transmit detection signals at different positions in the wellbore.

[0084] Furthermore, the ultrasonic transducer can be one or more. Since the signal radiation range of a single ultrasonic transducer is limited, preferably, multiple ultrasonic transducers can be set. When arranging multiple ultrasonic transducers, there may be crowded arrangement, or the signal radiation ranges of two adjacent ultrasonic transducers may overlap. Optimally, four ultrasonic transducers can be set.

[0085] Refer to Figure 3 As shown in the cross-sectional view of the drill collar in [reference], the four ultrasonic transducers are arranged at equal intervals along the circumference of the drill collar and are located on the same horizontal plane, and their sound waves radiate vertically outwards. After such an arrangement, the radiation ranges of the four ultrasonic transducers do not affect each other pairwise, and the overall radiation range of the four ultrasonic transducers can better cover the entire plane, and then can detect the entire wellbore wall with high precision to obtain the fracture condition of the entire wellbore wall. The four ultrasonic transducers work simultaneously to improve the spatial sampling resolution. Since the four ultrasonic transducers are arranged at equal intervals along a circle, the ultrasonic waves emitted by them are columnar and radiate vertically outwards. Since the drill collar drills in a spiral forward manner, along with the drilling mode of the drill collar, the ultrasonic transducer can effectively improve the spatial sampling rate with the same movement trajectory as the drill collar and ensure the imaging accuracy.

[0086] Among them, different positions in the wellbore include the depth and azimuth in the wellbore. The azimuth is specifically the magnetic azimuth, that is, the included angle between the orientation of the ultrasonic transducer and the magnetic north. Of course, if two positions have the same depth but different azimuths in the wellbore, they are two different positions. If two positions have different depths but the same azimuth in the wellbore, they are also two different positions. Only when the depth and azimuth of two positions in the wellbore are both the same can these two positions be called one position.

[0087] As the drill collar extends during drilling, the ultrasonic transducer emits detection signals towards the wellbore wall at different positions in the wellbore. Moreover, the ultrasonic transducer is controlled by a processing device. The processing device generates an electrical signal, and under the drive of the electrical signal, the ultrasonic transducer excites an ultrasonic wave signal and radiates it outward. The electrical signal is a pulse signal, the waveform of the pulse is controllable, and the number, frequency, and duty cycle of the pulse are adjustable.

[0088] The ultrasonic wave signal excited by the ultrasonic transducer is a broadband narrow pulse signal. The signal spectrum is mainly concentrated in the range of 150 - 300 KHz, and the pulse length is less than 10 microseconds. The ultrasonic transducer has a focusing ability. In the radiation range from 10 mm to 60 mm away from the radiation surface of the ultrasonic transducer, its sound field is cylindrically distributed, and the -3dB focusing width is less than 7 mm.

[0089] Refer to Figure 4 , in the embodiments of this article, the obtaining of the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position further includes:

[0090] S301: Obtain the echo time difference at each position according to the difference between the transmission time corresponding to the detection signal at each position and the echo time corresponding to the echo signal;

[0091] S302: Preprocess the echo signals at each position to obtain the echo amplitude at each position.

[0092] The electrical signal has a relatively large power and can drive the ultrasonic transducer. The ultrasonic transducer directly converts the electrical signal into an acoustic wave signal. This acoustic wave signal is a broadband narrow pulse ultrasonic wave signal. The beam of this acoustic wave signal is relatively narrow, and the energy is mainly focused in a cylindrical area with a radius of 7 mm and a distance from the transducer surface of 10 mm to 60 mm. The sound field distribution diagram can be referred to Figure 5 as shown. Due to the relatively narrow acoustic wave beam, the processing device has a relatively high imaging resolution during processing.

[0093] The acoustic wave signal is excited by the ultrasonic transducer and propagates forward in different media in the wellbore. When passing through the interface with different acoustic impedances, it will reflect and generate an echo signal in the reverse direction.

[0094] Specifically, since there is a large amount of noise in the echo signal, and the contour of this echo signal is basically the same as that of the detection signal but the amplitude is much lower. The later the echo signal appears, the lower its amplitude, and it is more likely to be submerged in the noise. The difference between the transmission time corresponding to a certain position and the echo time is the echo time difference corresponding to that position, where the echo time is the echo time corresponding to the preprocessed echo signal.

[0095] Refer to Figure 6 , in the embodiments of this article, the preprocessing of the echo signals at each position to obtain the echo amplitude at each position further includes:

[0096] S401: Filter the noise in the echo signals at each position;

[0097] S402: Compare the similarity between the denoised echo signals at each position and their corresponding detection signals, and screen out the echo signal segments with the highest similarity at each position;

[0098] S403: Adjust the amplitude of the screened echo signal segments at the corresponding positions according to the well diameter measurement values at each position in the wellbore to obtain the echo amplitudes at each position.

[0099] Specifically, steps S401 to S403 are carried out in sequence. The method for filtering noise can be a filtering method in the prior art, such as a smoothing filtering method, an arithmetic mean filtering method, etc. The specific method of filtering is not limited in this article.

[0100] The echo signal can be divided into several segments, and the segment with the highest similarity to the detection signal is determined as the echo signal segment. Since the contour of the echo signal is basically the same as that of the detection signal but the amplitude is much lower, the similarity here refers to the overall contour similarity.

[0101] After obtaining the echo signal segment with the highest similarity, it is necessary to adjust the amplitude of this segment. The amplitude is the maximum absolute value of the echo signal segment. After adjusting the amplitude, the echo amplitude at the corresponding position can be obtained.

[0102] Refer to Figure 7 , in the embodiment of this article, the comparison of the similarity between the denoised echo signals at each position and their corresponding detection signals, and screening out the echo signal segments with the highest similarity at each position further includes:

[0103] S501: Based on the signal length of the detection signal, divide the denoised echo signal into several segments;

[0104] S502: Amplify each segment of the echo signal so that the amplitude of each amplified echo signal is the same as the amplitude of the detection signal;

[0105] S503: Determine the cumulative amplitude deviation value between the detection signal and each amplified echo signal segment;

[0106] S504: Determine the segment of the echo signal with the smallest cumulative amplitude deviation value as the echo signal segment with the highest similarity.

[0107] In the embodiment of this article, taking the signal length of the detection signal as the basic unit, sliding division is carried out on the signal length of the detection signal with this basic unit to obtain several segments of echo signals. Since the contour of the echo signal is basically the same as that of the detection signal but the amplitude is much lower, each segment of the echo signal needs to be amplified. Taking one segment of the echo signal as an example, refer toFigure 8 , the magnification method can be as follows:

[0108] S601: Determine the amplitude of this segment of echo signal and the amplitude of the detection signal;

[0109] S602: Divide the amplitude of the detection signal by the amplitude of this segment of echo signal to obtain a multiple relationship;

[0110] S603: Multiply the whole of this segment of echo signal by the multiple relationship to obtain the amplified echo signal, where the amplitude of the amplified echo signal is consistent with the amplitude of the detection signal.

[0111] After amplifying each segment of echo signal, it is necessary to further determine the segment of echo signal with the highest similarity among them. When making the determination, taking a segment of echo signal as an example, referring to Figure 9 , the determination method can be as follows:

[0112] S701: Determine the amplitude deviation value between this segment of amplified echo signal and the detection signal at each time point;

[0113] S702: Sum all the amplitude deviation values to obtain the cumulative amplitude deviation value.

[0114] Specifically, since the signal lengths of each segment of amplified echo signal and the detection signal are the same, the signal length can be divided according to time points, starting from zero and divided into several time points. The interval between any two time points is equal and the specific interval can be set according to the actual working conditions. Summing the amplitude deviation values corresponding to all time points of the amplified echo signal and the detection signal can obtain the cumulative amplitude deviation value. In an ideal state, the signal segment with a cumulative amplitude deviation value of zero is the echo signal segment, and when the cumulative amplitude deviation value is zero, it means that the echo signal segment is exactly the same as the detection signal.

[0115] Referring to Figure 10 , in the embodiments of this article, the determination method for the wellbore diameter measurement values at each position in the wellbore includes:

[0116] S801: Determine the signal propagation speed at each position according to the correspondence between the environmental parameters and the signal propagation speed, and the environmental parameters at each position;

[0117] S802: Obtain the wellbore diameter measurement values at each position according to the signal propagation speed at each position and the echo time difference at the corresponding position.

[0118] In the embodiments of the present invention, the environmental parameters may be the density of the mud, the pressure of the mud, and the temperature of the mud. Specifically, during the drilling process, mud is distributed around the drill collar, and the mud is introduced into the well as drilling fluid. Therefore, when ultrasonic waves are transmitted, they are bound to pass through the mud medium. The propagation speed of ultrasonic waves is affected by the density, pressure, and temperature of the mud. Therefore, it is necessary to consider these environmental factors, namely, the density, pressure, and temperature of the mud. Therefore, it is necessary to determine the corresponding relationships between the mud density and the ultrasonic wave propagation speed, the mud pressure and the ultrasonic wave propagation speed, and the mud temperature and the ultrasonic wave propagation speed. The specific determination method can be obtained through experimental measurements under laboratory conditions. After determining the corresponding relationships between the environmental parameters (the density, pressure, and temperature of the mud) and the ultrasonic wave propagation speed, and determining the density, pressure, and temperature of the mud at the corresponding positions, the signal propagation speed at the corresponding positions can be determined.

[0119] The measured well diameter is equal to the ultrasonic wave propagation speed at the corresponding position multiplied by the echo time difference at the corresponding position.

[0120] Refer to Figure 11 , further, the adjusting the amplitude of the filtered echo signal segment at the corresponding position according to the measured well diameter values at each position in the wellbore to obtain the echo amplitude at each position further includes:

[0121] S901: Compare the measured well diameter value at each position with the theoretical well diameter value at that position;

[0122] S902: If the measured well diameter value at that position is greater than the theoretical well diameter value at that position, then increase a preset value on the basis of the current amplitude of the echo signal segment to obtain the echo amplitude at that position, where the preset value is the amplitude difference between the measured well diameter value and the theoretical well diameter value at that position;

[0123] S903: If the measured well diameter value at that position is less than the theoretical well diameter value at that position, then decrease a preset value on the basis of the current amplitude of the echo signal segment to obtain the echo amplitude at that position.

[0124] Specifically, the theoretical well diameter value can be measured and calculated by a professional logging tool. For the corresponding position, compare the measured well diameter value with the theoretical well diameter value. If the measured well diameter value is greater than the theoretical well diameter value, it indicates that the ultrasonic transducer at that position has shifted, resulting in the echo signal segment being smaller than the actual value. Therefore, it is necessary to increase the preset value on the basis of the current amplitude. If the measured well diameter value is less than the theoretical well diameter value, it indicates that the ultrasonic transducer at that position has shifted, resulting in the echo signal segment being larger than the actual value. Therefore, it is necessary to decrease the preset value on the basis of the current amplitude. If the measured well diameter value is equal to the theoretical well diameter value, it indicates that the ultrasonic transducer at that position has not shifted, and there is no need to adjust the amplitude of the echo signal segment.

[0125] Refer toFigure 12 , wherein the method for determining the preset value is as follows:

[0126] S1001: Determine the attenuation curve of the ultrasonic amplitude with distance;

[0127] S1002: According to the attenuation curve, determine the amplitude difference between the measured well diameter value and the theoretical well diameter value at the corresponding position;

[0128] S1003: Determine the amplitude difference as the preset value.

[0129] Specifically, during the propagation of ultrasonic waves, the amplitude of ultrasonic waves will attenuate with the increase of the propagation distance. The attenuation curve can be determined by laboratory measurement. The ultrasonic amplitudes corresponding to the measured well diameter value and the theoretical well diameter value are respectively determined on the attenuation curve, and the difference between the two is obtained to get the amplitude difference, which is the preset value.

[0130] Specifically, time difference imaging and amplitude imaging can be performed through a two-dimensional Cartesian coordinate system or a three-dimensional cylindrical coordinate system. Taking the time difference imaging of echo in the Cartesian coordinate system as an example: in the Cartesian coordinate system, the abscissa and ordinate respectively represent the azimuth and depth, and the brightness value of the pixel points in the coordinate system reflects the time difference of the echo. It can be that the brighter the brightness value, the longer the time difference of the echo, or the brighter the brightness value, the shorter the time difference of the echo. The principle of amplitude imaging is the same as that of time difference imaging, and will not be elaborated here.

[0131] Taking the time difference imaging of echo in the cylindrical coordinate system as an example: in the cylindrical coordinate system, the azimuth angle, height, and radial distance respectively correspond to the azimuth, depth, and measured well diameter value. The brightness value of the pixel points in the coordinate system reflects the time difference of the echo. It can be that the brighter the brightness value, the longer the time difference of the echo, or the brighter the brightness value, the shorter the time difference of the echo. The principle of amplitude imaging is the same as that of time difference imaging, and will not be elaborated here.

[0132] Through borehole endoscopic scanning, high-resolution borehole information can be imaged, providing technical support and decision-making basis for key issues such as real-time analysis of wellbore stability, real-time adjustment of horizontal wellbore trajectory, well pattern deployment of horizontal well drilling, and reservoir fracturing reconstruction during the drilling and development of oil and gas resources.

[0133] Based on the above-mentioned method for borehole endoscopic scanning imaging, an embodiment of the present invention also provides a device for borehole endoscopic scanning imaging. The device may include a system (including a distributed system), software (application), modules, components, servers, clients, etc. that use the method described in the embodiments of the present invention, and a device that combines necessary implementation hardware. Based on the same innovative concept, the devices in one or more embodiments provided by the embodiments of the present invention are as described in the following embodiments. Since the implementation solutions for the device to solve problems are similar to the method, the implementation of the specific device in the embodiments of the present invention can refer to the implementation of the foregoing method, and the repeated parts will not be described again. As used hereinafter, the term "unit" or "module" may be a combination of software and / or hardware that can implement a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0134] Specifically, Figure 13 is a schematic diagram of the module structure of an embodiment of a device for borehole endoscopic scanning imaging provided by an embodiment of the present invention. Refer to Figure 13 As shown, a device for borehole endoscopic scanning imaging provided by an embodiment of the present invention includes: a signal transmitting device 100, a signal receiving device 200, and a processing device 300.

[0135] The signal transmitting device 100 is used to transmit detection signals to the wellbore wall at different positions in the borehole;

[0136] The signal receiving device 200 is used to receive echo signals at corresponding positions in the borehole;

[0137] The processing device 300 is used to obtain the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position; and perform imaging of the inner wall of the borehole according to the emission position of each detection signal and the echo time difference and echo amplitude corresponding to the emission position.

[0138] Specifically, both the signal transmitting device 100 and the signal receiving device 200 are ultrasonic transducers. A total of four ultrasonic transducers are provided. The four ultrasonic transducers are all electrically connected to the processing device 300. The four ultrasonic transducers are equally spaced on the side wall of the drill collar and are on the same horizontal plane.

[0139] Each ultrasonic transducer can receive instructions from the processing device 300 and transmit ultrasonic signals at different positions in the borehole during the drilling process of the drill collar. Different positions represent different depths and azimuths; each ultrasonic transducer sends the echo signals of the ultrasonic waves at the corresponding positions to the processing device 300; the processing device 300 obtains the echo time difference and echo amplitude of the ultrasonic waves at the corresponding positions according to the emission signals and echo signals at different positions; and performs imaging of the inner wall of the borehole in the coordinate system according to the emission position of the ultrasonic waves, the echo time difference corresponding to the emission position, and the echo amplitude.

[0140] Referring to Figure 14 As shown, based on the method of borehole endoscopic scanning imaging described above, in an embodiment of the present invention, a computer device 1402 is further provided, where the above method runs on the computer device 1402. The computer device 1402 may include one or more processors 1404, such as one or more central processing units (CPUs) or graphics processing units (GPUs), and each processing unit may implement one or more hardware threads. The computer device 1402 may also include any memory 1406 for storing any kind of information such as code, settings, data, etc. In a specific embodiment, a computer program stored on the memory 1406 and executable on the processor 1404, when run by the processor 1404, may execute instructions according to the above method. Non-limiting examples include that the memory 1406 may include any one or a combination of the following: any type of RAM, any type of ROM, flash memory devices, hard disks, optical discs, etc. More generally, any memory may use any technology to store information. Further, any memory may provide volatile or non-volatile retention of information. Further, any memory may represent a fixed or removable component of the computer device 1402. In one case, when the processor 1404 executes associated instructions stored in any memory or combination of memories, the computer device 1402 may perform any operation of the associated instructions. The computer device 1402 further includes one or more drive mechanisms 1408 for interacting with any memory, such as a hard disk drive mechanism, an optical disc drive mechanism, etc.

[0141] The computer device 1402 may also include an input / output module 1410 (I / O) for receiving various inputs (via an input device 1412) and for providing various outputs (via an output device 1414). A specific output mechanism may include a presentation device 1416 and an associated graphical user interface 1418 (GUI). In other embodiments, the input / output module 1410 (I / O), the input device 1412, and the output device 1414 may not be included, and it may only be a computer device in a network. The computer device 1402 may also include one or more network interfaces 1420 for exchanging data with other devices via one or more communication links 1422. One or more communication buses 1424 couple the components described above together.

[0142] The communication link 1422 may be implemented in any way, for example, through a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 1422 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc. governed by any protocol or combination of protocols.

[0143] corresponding to Figure 1 、 Figure 2 、 Figure 4 、 Figures 6 to 12 In the method of [ID=], the embodiments of the present disclosure also provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is run by a processor, the steps of the above method are executed.

[0144] The embodiments of the present disclosure also provide a computer-readable instruction, when the processor executes the instruction, the program therein causes the processor to execute as Figure 1 、 Figure 2 、 Figure 4 、 Figures 6 to 12 shown in the method.

[0145] It should be understood that in the various embodiments of the present disclosure, the magnitude of the sequence numbers of the above processes does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present disclosure.

[0146] It should also be understood that in the embodiments of the present disclosure, the term "and / or" is only a relationship describing the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present disclosure generally represents an "or" relationship between the associated objects before and after.

[0147] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in the present disclosure can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been generally described according to their functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present disclosure.

[0148] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0149] In several embodiments provided in this document, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be indirect couplings or communication connections through some interfaces, devices, or units, and can also be electrical, mechanical, or other forms of connection.

[0150] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments in this document.

[0151] In addition, in each embodiment of this document, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0152] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution in this document, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this document. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0153] Specific embodiments are used in this document to elaborate on the principles and implementation manners of this document. The description of the above embodiments is only used to help understand the method and its core idea in this document; at the same time, for those of ordinary skill in the art, according to the idea in this document, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this document.

Claims

1. A method for borehole endoscopic scanning imaging, characterized in that, Comprising: Transmitting detection signals to the wellbore wall at different positions within the wellbore; Receiving echo signals at corresponding positions within the wellbore; Obtaining the echo time differences and echo amplitudes at each position based on the detection signals and echo signals at each position; Performing imaging of the inner wall of the wellbore based on the emission positions of the detection signals and the corresponding echo time differences and echo amplitudes at the emission positions; Wherein, the obtaining of the echo time differences and echo amplitudes at each position based on the detection signals and echo signals at each position further includes: Obtaining the echo time differences at each position based on the difference between the emission time corresponding to the detection signal at each position and the echo time corresponding to the echo signal; Filtering out the noise in the echo signals at each position; Comparing the similarity between the denoised echo signal at each position and its corresponding detection signal, and screening out the echo signal segment with the highest similarity at each position; Comparing the measured wellbore diameter value at each position with the theoretical wellbore diameter value at that position; If the measured wellbore diameter value at that position is greater than the theoretical wellbore diameter value at that position, adding a preset value to the current amplitude value of the echo signal segment to obtain the echo amplitude at that position, where the preset value is the amplitude difference between the measured wellbore diameter value and the theoretical wellbore diameter value at that position; If the measured wellbore diameter value at that position is less than the theoretical wellbore diameter value at that position, subtracting the preset value from the current amplitude value of the echo signal segment to obtain the echo amplitude at that position; Wherein, the method for determining the measured wellbore diameter values at each position within the wellbore includes: Determining the signal propagation speed at each position according to the corresponding relationship between the environmental parameters and the signal propagation speed, and the environmental parameters at each position; Obtaining the measured wellbore diameter values at each position based on the signal propagation speed at each position and the corresponding echo time difference at that position.

2. The method for borehole endoscopic scanning imaging according to claim 1, wherein The transmitting of detection signals to the wellbore wall at different positions within the wellbore further includes: Installing an ultrasonic transducer on the drill collar, and driving the ultrasonic transducer to lower into the wellbore by the drill collar; When the ultrasonic transducer is lowered to different positions within the wellbore, transmitting detection signals.

3. The method for borehole endoscopic scanning imaging according to claim 1, wherein The comparing of the similarity between the denoised echo signal at each position and its corresponding detection signal, and screening out the echo signal segment with the highest similarity at each position further includes: Dividing the denoised echo signal into several segments based on the signal length of the detection signal; Amplifying each segment of the echo signal so that the amplitude value of each amplified echo signal segment is consistent with the amplitude value of the detection signal; Determining the cumulative amplitude deviation value between the detection signal and each amplified echo signal segment; Determining the segment of the echo signal with the smallest cumulative amplitude deviation value as the echo signal segment with the highest similarity.

4. The method according to claim 1, wherein The determination process of the preset value includes: According to the ultrasonic amplitude attenuation curve with distance; Determining the amplitude difference between the measured wellbore diameter value and the theoretical wellbore diameter value at the corresponding position according to the attenuation curve; Determining the amplitude difference as the preset value.

5. A device for endoscopic scanning imaging in a wellbore, characterized in that, The device includes: A signal transmitting device for transmitting detection signals to the wellbore wall at different positions within the wellbore; A signal receiving device for receiving echo signals at corresponding positions within the wellbore; A processing device, configured to obtain the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position; and perform imaging of the inner wall of the wellbore according to the emission positions of the detection signals and the echo time difference and echo amplitude corresponding to the emission positions. Wherein, the obtaining the echo time difference and echo amplitude at each position according to the detection signals and echo signals at each position further includes: Obtaining the echo time difference at each position according to the difference between the emission time corresponding to the detection signal at each position and the echo time corresponding to the echo signal. Filtering out the noise in the echo signals at each position. Comparing the similarity between the denoised echo signals at each position and their corresponding detection signals, and screening out the echo signal segments with the highest similarity at each position. Comparing the measured wellbore diameter value at each position with the theoretical wellbore diameter value at that position. If the measured wellbore diameter value at that position is greater than the theoretical wellbore diameter value at that position, increasing a preset value on the basis of the current amplitude of the echo signal segment to obtain the echo amplitude at that position, where the preset value is the amplitude difference between the measured wellbore diameter value and the theoretical wellbore diameter value at that position. If the measured wellbore diameter value at that position is less than the theoretical wellbore diameter value at that position, decreasing a preset value on the basis of the current amplitude of the echo signal segment to obtain the echo amplitude at that position; wherein, the method for determining the measured wellbore diameter values at each position in the wellbore includes: Determining the signal propagation speed at each position according to the corresponding relationship between the environmental parameters and the signal propagation speed, and the environmental parameters at each position. Obtaining the measured wellbore diameter values at each position according to the signal propagation speed at each position and the echo time difference at the corresponding position.

6. A computer device, comprising a memory, a processor, and a computer program stored on the memory, characterized in that, When the computer program is run by the processor, it executes the instructions of the method according to any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor of the computer device, it executes the instructions of the method according to any one of claims 1-4.

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