Integrated perimeter scanning acoustic sensor structure

Abstract

This invention discloses an integrated wellbore scanning acoustic sensor structure for geophysical acoustic logging. The structure includes a housing, with several upper sensors fixedly connected circumferentially to the upper part of the housing and several lower sensors fixedly connected circumferentially to the lower part. An adjustment block is fixedly connected to the bottom of the housing, and a controller, power supply, and gyroscope are fixedly connected within the adjustment block. A water storage chamber is formed within the adjustment block, and a "well"-shaped partition divides the water storage chamber into a front chamber, a rear chamber, a middle chamber, a left chamber, and a right chamber. Pump bodies are fixedly connected to the four side walls of the middle chamber, communicating with the front, rear, left, and right chambers respectively. The pump bodies, upper sensors, lower sensors, and gyroscope are all electrically connected to the controller. Using the technical solution of this invention, the sensor can adjust its rotation angle and maintain verticality.

Description

Technical Field

[0001] This invention belongs to the field of geophysical acoustic logging, specifically an integrated wellbore scanning acoustic sensor structure. Background Technology

[0002] Scientists in the field of oil well logging have been exploring methods for scanning and measuring the entire wellbore. The usual method is to use a motion rotation control system to drive the sensor to rotate and scan. However, this method is prone to motion control system failure and low positioning accuracy in high temperature and high pressure environments.

[0003] Patent publication number CN1841090A discloses a method for scanning and radiating a three-dimensional sound field into the formation outside the well. The method involves arranging three or more circular arc array acoustic wave radiators into a combined circular arc array along the well axis in the well. The array elements of the circular arc array acoustic wave radiators are excited along the well axis and the well circumference direction, respectively. The delay time of the excitation signal of each array element is adjusted so that the synthesized main beam is deflected vertically and horizontally. By continuously changing the combination of different array elements of the combined circular arc array and increasing or decreasing the delay time of the excitation signal of the adjacent circular arc array acoustic wave radiators, a three-dimensional sound field can be radiated into the formation outside the well in all directions.

[0004] The above-mentioned method of scanning and radiating a three-dimensional acoustic field into the formation outside the well can generate a synthetic main beam with arbitrary directional angle by arranging them into a combined arc array along the well axis and controlling the delay of the excitation time of each acoustic radiator. However, it is necessary to keep the arc array acoustic radiators on the same vertical axis. When digging a exploratory well, the drill bit is in contact with the soil and will be subjected to lateral torque, which will cause a slight deviation in the digging direction rather than absolute verticality. Therefore, it is difficult to ensure that the arc array acoustic radiators are on the same vertical axis along the well axis. Summary of the Invention

[0005] To address the problem in existing technologies that make it difficult to ensure that circular arc array acoustic radiators are on the same vertical axis, the purpose of this invention is to provide an integrated well-circumferential scanning acoustic sensor structure that can adjust its own rotation angle to maintain verticality.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: An integrated well-circumferential scanning acoustic sensor structure includes a housing, with several upper sensors fixedly connected to the upper part of the housing and several lower sensors fixedly connected to the lower part of the housing. An adjustment block is fixedly connected to the bottom of the housing, and a controller, a power supply, and a gyroscope are fixedly connected inside the adjustment block. A water storage chamber is opened inside the adjustment block, and a "well"-shaped partition is provided inside the water storage chamber. The partition divides the water storage chamber into a front chamber, a rear chamber, a middle chamber, a left chamber, and a right chamber. Pump bodies are fixedly connected to the four side walls of the middle chamber, and the pump bodies are respectively connected to the front chamber, the rear chamber, the left chamber, and the right chamber. The pump bodies, the upper sensors, the lower sensors, and the gyroscope are all electrically connected to the controller.

[0007] The above scheme achieves the following beneficial effects: Users can lower the casing into the exploration well using ropes; the controller can control the upper or lower sensor to generate acoustic signals; different sensors are excited through different combinations of timing sequences, causing the generated sound waves to be synthesized into a main beam at a specified angle; the propagation of the sound waves satisfies the classical wave equation; and the timing sequence can control the lateral quantities within the wave equation, causing them to coincide at a specified angle, thus completing multi-angle scanning. The upper and lower sensors allow for adjustment of the scanning angle in the vertical plane, while sensors in the same layer can adjust the angle laterally, resulting in a larger scanning range.

[0008] However, the casing is located below the exploration well, where the conditions are unknown. The casing tilts, causing a deviation in the superposition of acoustic waves and resulting in unpredictable deviations in the scanning angle. A gyroscope can detect this tilt angle. By changing the liquid volume in the front, rear, left, and right chambers through a pump, the center of gravity of the casing shifts. This negative feedback regulation, combining gyroscope detection and pump adjustment, keeps the casing vertical, ensuring the accuracy of the scanning angle.

[0009] Compared with existing technologies, the housing is rigid and the device is an integrated structure. There is no need to detect the position of each sensor. Simply keeping the housing vertical is enough to ensure that the upper and lower sensors are vertically distributed. By changing the liquid distribution in the front, rear, left, and right chambers, the center of gravity of the housing is adjusted, enabling the housing to resist tilting caused by the external environment.

[0010] Furthermore, the number of both the upper and lower sensors is four.

[0011] Beneficial effects: The most basic planar directions are front, back, left, and right. The number of sensors is four in each direction, which allows the scanning angle to be adjusted in these four directions, achieving a larger scanning range at a lower cost.

[0012] Furthermore, both the upper and lower sensors include a front acoustic piezoelectric ceramic sheet and a back acoustic piezoelectric ceramic sheet.

[0013] Beneficial effects: By using the parallel connection method of electrical terminals, the sensor forms a typical Langevin transducer structure, thereby ensuring that the piezoelectric ceramic stack can vibrate in a coordinated manner, and no additional insulation structure is required at the front and rear cover plates of the ceramic sheet.

[0014] Furthermore, the controller is equipped with a high-frequency crystal oscillator.

[0015] Beneficial effects: The device controls the angle by utilizing the trigger delay between sensors, thus requiring a high degree of timing awareness. The crystal oscillator's vibration frequency is the controller's execution cycle; therefore, a high-frequency crystal oscillator can achieve higher execution accuracy.

[0016] Furthermore, it includes a rope fixing buckle, with elastic supports fixedly connected to both sides of the rope fixing buckle. The elastic supports include a first support rod, a second support rod hinged to the first support rod, an elastic element fixedly connected between the first support rod and the second support rod, and a roller rotatably connected to the side of the second support rod away from the first support rod.

[0017] Beneficial effects: As we know from basic mechanics, torque equals force multiplied by length. The longer the rope, the greater the torque it experiences, and the more pronounced the swaying. The rope fixing buckle is used to secure the rope, while the elastic support can use elastic elements to change the opening angle between the first and second support rods, allowing the roller to press against the sidewall of the well. Pressing against the sidewall constrains the rope fixing buckle, reducing rope swaying and improving the stability of the device. The roller allows the elastic support to move along the sidewall of the well.

[0018] Furthermore, a heat dissipation copper pipe is installed inside the casing, and semiconductor cooling chips are fixedly connected to both ends of the casing.

[0019] Beneficial effects: Due to varying geological conditions in different regions, high temperatures may occur during well drilling. The semiconductor cooling chip can cool the heat dissipation copper pipe, which is located inside the housing. This reduces the temperature of the upper and lower sensors, thereby decreasing the probability of aging or damage to the upper and lower sensors due to high temperatures.

[0020] Furthermore, the frequencies of both the front and back acoustic wave piezoelectric ceramic sheets are in the range of 20 kHz to 25 kHz.

[0021] Beneficial effects: The higher the frequency of a sound wave, the shorter its period, making it more difficult to synthesize the main beam. Conversely, if the frequency of a sound wave is too low, it will be perceptible to the human ear, causing noise pollution. A frequency range of 20kHz to 25kHz reduces the difficulty of synthesizing the main beam while ensuring it is imperceptible to the human ear.

[0022] Furthermore, mercury is installed inside the water storage chamber.

[0023] Beneficial effects: By changing the distribution of liquid in the water storage chamber through the pump body, the center of gravity of the device is changed. The greater the percentage of the mass of liquid in the water storage chamber to the total weight of the device, the more obvious the effect of changing the center of gravity of the device. Mercury has a very high density, which can enhance the effect of the water storage chamber in changing the position of the center of gravity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of a grid-shaped partition. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] The reference numerals in the accompanying drawings include: housing 1, upper sensor 2, adjusting block 3, controller 4, power supply 5, gyroscope 6, water storage chamber 7, "well" shaped partition 8, pump body 9, rope fixing buckle 10, heat dissipation copper pipe 11, semiconductor cooling chip 12, first support rod 13, second support rod 14, elastic element 15, roller 16.

[0028] Example 1

[0029] The basic implementation examples are as follows: Figure 1 and attached Figure 2 As shown:

[0030] The integrated wellbore scanning acoustic sensor structure includes a housing 1. Several upper sensors 2 are fixed to the upper part of the housing 1 by circumferential screws, and several lower sensors are fixed to the lower part of the housing 1 by circumferential screws. Both the upper and lower sensors are model KTK-D20. An adjusting block 3 is bolted to the bottom of the housing 1. A controller 4, a power supply 5, and a gyroscope 6 are bolted inside the adjusting block 3. The controller 4 is model STM32F103C8T6, the power supply 5 is model LR6-8B, and the gyroscope 6 is model... The TL720D-CAN has a water storage chamber 7 inside the regulating block 3. The water storage chamber 7 has an integrally formed "well"-shaped partition, which divides the water storage chamber 7 into a front chamber, a rear chamber, a middle chamber, a left chamber, and a right chamber. The four side walls of the middle chamber are bolted with pump bodies 9. The pump bodies 9 consist of two water pumps in opposite directions. The model of the water pumps is WB1425-B. The pump bodies 9 are connected to the front chamber, the rear chamber, the left chamber, and the right chamber, respectively. The pump bodies 9, the upper sensor 2, the lower sensor, and the gyroscope 6 are all electrically connected to the controller 4.

[0031] The specific implementation process is as follows: The user can use ropes to lower the casing 1 into the exploration well. The controller 4 can control the upper sensor 2 or the lower sensor to generate acoustic signals. By exciting different sensors through different combinations of timing, the sound waves generated are combined into the main beam at a specified angle. The propagation of the sound waves satisfies the classical wave equation. By controlling the timing, the lateral quantity in the wave equation can be made to coincide at a specified angle, completing multi-angle scanning. The upper sensor 2 and the lower sensor allow the scanning angle to be adjusted in the vertical plane, while the sensors in the same layer can adjust the angle in the lateral direction, making the scanning range larger.

[0032] However, the casing 1 is located below the exploration well, where the conditions are unknown. Dust or debris may adhere to the casing 1, making it prone to tilting. This can cause deviations in the superposition of acoustic waves, resulting in unpredictable deviations in the scanning angle. The gyroscope 6 can detect the tilt angle of the casing 1. By changing the liquid volume in the front, rear, left, and right chambers through the pump body 9, the center of gravity of the casing 1 is shifted. The negative feedback regulation formed by the detection by the gyroscope 6 and the adjustment by the pump body 9 keeps the casing 1 vertical, thus ensuring the accuracy of the scanning angle.

[0033] The housing 1 of the device is rigid and the device is an integral structure. There is no need to detect the position of each sensor. It is only necessary to keep the housing 1 vertical so that the upper sensor 2 and the lower sensor can be vertically distributed. By changing the liquid distribution in the front chamber, rear chamber, left chamber and right chamber, the center of gravity of the housing 1 can be adjusted so that the housing 1 can resist the tilt caused by the external environment.

[0034] Example 2

[0035] The difference from the above embodiment is that the number of upper sensor 2 and lower sensor is four.

[0036] The specific implementation process is as follows: the most basic planar directions are front, back, left, and right. The number of sensors is four in each direction, so that the scanning angle can be adjusted in these four directions, achieving a larger scanning range at a lower cost.

[0037] Example 3

[0038] The difference from the above embodiment is that both the upper sensor 2 and the lower sensor include a front acoustic piezoelectric ceramic sheet and a back acoustic piezoelectric ceramic sheet.

[0039] The specific implementation process is as follows: the electrical terminals are connected in parallel to form a typical Langevin transducer structure, thereby ensuring that the piezoelectric ceramic stack can vibrate in a coordinated manner, and no additional insulation structure is required at the front and rear cover plates of the ceramic sheet.

[0040] Example 4

[0041] The difference from the above embodiment is that the controller 4 is electrically connected to a high-frequency crystal oscillator, the model of which is ABM8-166-114.285MHZ.

[0042] The specific implementation process is as follows: The device controls the angle by utilizing the trigger delay between sensors, thus requiring a high degree of timing awareness. The crystal oscillator's vibration frequency is the execution cycle of controller 4, therefore a high-frequency crystal oscillator can achieve higher execution accuracy.

[0043] Example 5

[0044] The difference from the above embodiment is that: it includes a rope fixing buckle 10, and elastic supports are bolted to both sides of the rope fixing buckle 10. The elastic supports include a first support rod 13, a second support rod 14 is hinged to the first support rod 13, an elastic element 15 is welded and fixed between the first support rod 13 and the second support rod 14, and a roller 16 is rotatably connected to the side of the second support rod 14 away from the first support rod 13.

[0045] The specific implementation process is as follows: As we know from basic mechanics, torque equals force multiplied by length. The longer the rope, the greater the torque it experiences, and the more pronounced the swaying. The rope fixing buckle 10 is used to fix the rope, while the elastic support can use the elastic element 15 to change the opening angle between the first support rod 13 and the second support rod 14, allowing the roller 16 to abut against the side wall of the detection well. Abutting against the side wall of the detection well constrains the rope fixing buckle 10, reducing rope swaying and improving the stability of the device. The roller 16 allows the elastic support to move along the side wall of the detection well.

[0046] Example 6

[0047] The difference from the above embodiment is that: a heat dissipation copper pipe 11 is bolted inside the housing 1, and a semiconductor cooling chip 12 is bolted at both ends of the housing 1. The semiconductor cooling chip 12 is model TEC1-12706.

[0048] The specific implementation process is as follows: Due to the different geological conditions in different regions, high temperatures may be generated in the exploration well. The semiconductor cooling chip 12 can cool the heat dissipation copper pipe 11, which is located inside the housing 1. It can reduce the temperature of the upper sensor 2 and the lower sensor, thereby reducing the probability of the upper sensor 2 and the lower sensor aging or being damaged due to high temperature.

[0049] Example 7

[0050] The difference from the above embodiment is that the frequencies of both the front and back acoustic wave piezoelectric ceramic sheets are between 20 kHz and 25 kHz.

[0051] The specific implementation process is as follows: The higher the frequency of the sound wave, the shorter its period, making it more difficult to synthesize the main beam. However, if the frequency of the sound wave is too low, it will be perceived by the human ear, causing noise pollution. A frequency of 20kHz to 25kHz is used to reduce the difficulty of synthesizing the main beam while ensuring it is imperceptible to the human ear.

[0052] Example 8

[0053] The difference from the above embodiment is that the water storage chamber 7 contains mercury.

[0054] The specific implementation process is as follows: The distribution of liquid in the water storage chamber 7 is changed by the pump body 9, thereby changing the center of gravity of the device. The greater the percentage of the mass of the liquid in the water storage chamber 7 to the total weight of the device, the more obvious the effect of changing the center of gravity of the device. Mercury has a very high density, which can enhance the effect of the water storage chamber 7 in changing the position of the center of gravity.

[0055] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An integrated well-circumferential scanning acoustic sensor structure, characterized in that: The device includes a housing. Several upper sensors are fixedly connected to the upper part of the housing, and several lower sensors are fixedly connected to the lower part of the housing. An adjustment block is fixedly connected to the bottom of the housing. A controller, a power supply, and a gyroscope are fixedly connected inside the adjustment block. A water storage chamber is opened inside the adjustment block. A "well"-shaped partition is provided inside the water storage chamber, which divides the water storage chamber into a front chamber, a rear chamber, a middle chamber, a left chamber, and a right chamber. Pump bodies are fixedly connected to the four side walls of the middle chamber. The pump bodies are connected to the front chamber, the rear chamber, the left chamber, and the right chamber, respectively. The pump bodies, the upper sensors, the lower sensors, and the gyroscope are all electrically connected to the controller. It includes a rope fixing buckle, and elastic supports are fixedly connected to both sides of the rope fixing buckle. The elastic supports include a first support rod, a second support rod is hinged to the first support rod, an elastic element is fixedly connected between the first support rod and the second support rod, and a roller is rotatably connected to the side of the second support rod away from the first support rod.

2. The integrated wellbore scanning acoustic sensor structure according to claim 1, characterized in that: The number of upper and lower sensors is four each.

3. The integrated wellbore scanning acoustic sensor structure according to claim 2, characterized in that: Both the upper and lower sensors include a front acoustic piezoelectric ceramic sheet and a back acoustic piezoelectric ceramic sheet.

4. The integrated wellbore scanning acoustic sensor structure according to claim 3, characterized in that: The controller is equipped with a high-frequency crystal oscillator.

5. The integrated wellbore scanning acoustic sensor structure according to claim 4, characterized in that: The housing contains a heat dissipation copper pipe, and semiconductor cooling chips are fixedly connected to both ends of the housing.

6. The integrated wellbore scanning acoustic sensor structure according to claim 5, characterized in that: The rated frequencies of both the front and back acoustic wave piezoelectric ceramic sheets are between 20kHz and 25kHz.

7. The integrated wellbore scanning acoustic sensor structure according to claim 6, characterized in that: The water storage chamber contains mercury.

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