A borehole resistivity microscanner and microresistivity scanning borehole imaging tool

Abstract

This utility model discloses a downhole resistivity micro-scanner and a micro-resistivity scanning wellbore imaging logging tool. The downhole resistivity micro-scanner includes at least one signal processing board and multiple micro-scanning plates; the signal processing board is electrically connected to at least two micro-scanning plates; the signal processing board includes multiple signal input ports and multiple signal output ports, and the micro-scanning plates include detection input ports and detection output ports. The detection input ports are in contact with the downhole surface to be measured, and the detection output ports are electrically connected to the signal input ports. The technical solution provided by this utility model can reduce the overall power consumption of the downhole resistivity micro-scanner, reduce the operating temperature of the downhole resistivity micro-scanner, and extend the service life of the downhole resistivity micro-scanner.

Description

Technical Field

[0001] This utility model relates to the field of logging instrument technology, and in particular to a downhole resistivity micro-scanner and a micro-resistivity scanning wellbore imaging logging instrument. Background Technology

[0002] As oil and gas exploration progresses faster and becomes more sophisticated, the exploration targets are becoming increasingly complex and hidden, making exploration more difficult. Conventional logging can no longer meet the requirements of reservoir description in terms of reservoir characterization and rapid discovery of oil and gas layers.

[0003] Micro-resistivity logging tools can measure formation information downhole, and then determine the presence of oil or other resources based on this information. In existing micro-resistivity logging tools, each micro-scanning plate integrates a data acquisition chip and a processing chip. When one micro-scanning plate malfunctions and needs replacement, it can be easily removed and replaced with a new one. However, because micro-resistivity logging tools operate downhole in high-temperature environments, the presence of processing chips in each micro-scanning plate results in high operating temperatures, increasing power consumption and reducing the tool's lifespan. Therefore, reducing the power consumption of micro-resistivity logging tools is a pressing technical problem that needs to be addressed. Utility Model Content

[0004] This invention provides a downhole resistivity micro-scanner and a micro-resistivity scanning wellbore imaging logging tool, which can reduce the overall power consumption of the downhole resistivity micro-scanner, reduce the operating temperature of the downhole resistivity micro-scanner, and extend the service life of the downhole resistivity micro-scanner.

[0005] In a first aspect, this utility model provides a downhole resistivity micro-scanner, comprising: at least one signal processing board and multiple micro-scanning plates;

[0006] The signal processing board is electrically connected to at least two of the micro-scanning plates; the signal processing board includes multiple signal input ports and multiple signal output ports, the micro-scanning plate includes a detection input port and a detection output port, the detection input port is in contact with the surface to be measured downhole, and the detection output port is electrically connected to the signal input port.

[0007] Optionally, the signal processing board is integrally disposed with one of the micro-scanning plates.

[0008] Optionally, the signal processing board is electrically connected to each of the three micro-scanned plates.

[0009] Optionally, the signal processing board includes: an electrical signal conversion unit;

[0010] The electrical signal conversion unit includes an electrical signal input terminal and an electrical signal output terminal, and the electrical signal input terminal is electrically connected to the detection output port.

[0011] Optionally, the signal processing board further includes: an analog-to-digital conversion unit;

[0012] The analog-to-digital conversion unit includes an analog signal input terminal and a digital signal output terminal; the analog signal input terminal is electrically connected to the digital signal output terminal.

[0013] Optionally, the downhole resistivity micro-scanner may also include: a storage unit;

[0014] The storage unit includes a storage port, which is electrically connected to the digital signal output terminal.

[0015] Optionally, the downhole resistivity micro-scanner includes: a first micro-scanning electrode group and a second micro-scanning electrode group, and the signal processing board includes a first signal processing board and a second signal processing board;

[0016] The first micro-scan electrode group includes three micro-scan electrodes, and the first signal processing board is electrically connected to each of the micro-scan electrodes in the first micro-scan electrode group;

[0017] The second micro-scan electrode group includes three micro-scan electrodes, and the second signal processing board is electrically connected to each of the micro-scan electrodes in the second micro-scan electrode group.

[0018] Optionally, the first signal processing board is integrally disposed with one of the micro-scanning plates in the first micro-scanning plate group; and / or,

[0019] The second signal processing board is integrally configured with one of the micro-scanning plates in the second micro-scanning plate group.

[0020] Optionally, the resistivity micro-scanner may also include:

[0021] The signal processing board and the micro-scanning electrode plate are placed in the heat insulation structure.

[0022] Secondly, this utility model also provides a micro resistivity scanning wellbore imaging logging tool, including the downhole resistivity micro scanner described in the first aspect.

[0023] The technical solution of this utility model involves setting at least one signal processing board and multiple micro-scanning plates. The signal processing board is electrically connected to at least two micro-scanning plates, enabling the signal processing board to receive signals detected by at least two micro-scanning plates. The signal processing board can process the signals detected by at least two micro-scanning plates, thereby reducing the number of signal processing boards required, reducing the overall power consumption of the downhole resistivity micro-scanner, reducing the operating temperature of the downhole resistivity micro-scanner, and extending the service life of the downhole resistivity micro-scanner. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, although the drawings described below are some specific embodiments of this utility model, those skilled in the art can extend and extend to other structures and drawings based on the basic concepts of the device structure, driving method and manufacturing method disclosed and indicated by the various embodiments of this utility model. Undoubtedly, these should all be within the scope of the claims of this utility model.

[0025] Figure 1 A schematic diagram of the structure of a downhole resistivity micro-scanner provided for an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of another downhole resistivity micro-scanner provided in this embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of another downhole resistivity micro-scanner provided for an embodiment of this utility model;

[0028] Figure 4 A schematic diagram of another downhole resistivity micro-scanner provided for an embodiment of this utility model;

[0029] Figure 5 A schematic diagram of the structure of a downhole resistivity micro-scanner provided for an embodiment of this utility model;

[0030] Figure 6 A schematic diagram of another downhole resistivity micro-scanner provided for an embodiment of this utility model. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the basic concepts disclosed and indicated in the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0032] Figure 1 A schematic diagram of a downhole resistivity micro-scanner provided for an embodiment of this utility model is shown below. Figure 1As shown, the downhole resistivity micro-scanner 100 includes at least one signal processing board 10 and multiple micro-scanning plates 20; the signal processing board 10 is electrically connected to at least two micro-scanning plates 20; the signal processing board 10 includes multiple signal input ports IN and multiple signal output ports OUT, and the micro-scanning plates 20 include a detection input port in and a detection output port out, the detection input port in is in contact with the downhole surface to be measured, and the detection output port out is electrically connected to the signal input port IN.

[0033] The signal processing board 10 includes chips such as a microcontroller, and the micro-scanning plate 20 includes structures such as a driving circuit. These can be configured according to actual needs, and no specific limitations are made here.

[0034] Specifically, the detection input port in of the micro-scanning electrode 20 is in contact with the downhole surface to be measured. The micro-scanning electrode 20 can provide a current signal to the downhole surface through the detection input port in, and then receive the returned current signal through the detection input port in. This current signal is then transmitted to the signal processing board 10 through the detection output port out. The signal processing board 10 can filter and convert the current signal before transmitting it to other devices through the signal output port out. The number of micro-scanning electrodes 20 can be set according to parameters such as the size of the downhole surface to be measured, and is not specifically limited here. In an optional embodiment, the downhole resistivity micro-scanner 100 includes n micro-scanning electrodes 20, where n is 2, 3, or 6. The number of micro-scanning electrodes 20 can also be other values, and is not specifically limited here. In this way, by setting the detection output port out of each micro-scanning plate 20 to be electrically connected to the signal processing board 10, the number of signal processing boards 10 in the downhole resistivity micro-scanner 100 is reduced, the power consumption and heat generated due to the large number of signal processing boards 10 are reduced, the operating temperature of the downhole resistivity micro-scanner 100 is reduced, and the service life of the downhole resistivity micro-scanner 100 is extended.

[0035] It should be noted that the detection input port in the micro-scanning electrode 20 may include a probe. Current is emitted into the formation along the wellbore through the probe, and the current signal emitted by each micro-scanning electrode 20 is then acquired. Due to differences in the rock composition, structure, and contained fluids encountered by the probe, variations in current occur. These current variations reflect changes in rock resistivity at different locations along the wellbore. After high-density sampling and high-resolution imaging processing, a wellbore image displaying resistivity can be generated. Its longitudinal resolution can reach several millimeters. The image provides intuitive visual functionality, allowing for accurate analysis of fracture distribution characteristics and types, formation bedding, the division of thin sand-mud interlayers, effective reservoir thickness, variations in sedimentary sequence, and gravel particle size.

[0036] The technical solution provided by this utility model embodiment sets up at least one signal processing board and multiple micro-scanning plates. The signal processing board is electrically connected to at least two micro-scanning plates, so that the signal processing board can receive signals detected by at least two micro-scanning plates and process the signals detected by at least two micro-scanning plates. This reduces the number of signal processing boards, lowers the overall power consumption of the downhole resistivity micro-scanner, lowers the operating temperature of the downhole resistivity micro-scanner, and extends the service life of the downhole resistivity micro-scanner.

[0037] Optional, Figure 2 A schematic diagram of another downhole resistivity micro-scanner provided in this embodiment of the present invention is shown below. Figure 2 As shown, the signal processing board 10 is integrated with one of the micro-scanning plates 20.

[0038] Specifically, both the signal processing board 100 and the micro-scanning electrode plate 20 can be circuit boards, and they can be fabricated on the same circuit board. In this way, the signal processing board 100 and the micro-scanning electrode plate 20 can be integrated, improving the space utilization of the downhole resistivity micro-scanner 100.

[0039] Optional, Figure 3 A schematic diagram of another downhole resistivity micro-scanner provided for an embodiment of this utility model is shown below. Figure 3 As shown, the signal processing board 10 includes an electrical signal conversion unit 11; the electrical signal conversion unit 11 includes an electrical signal input terminal, which is electrically connected to the detection output port out.

[0040] The electrical signal conversion unit 10 includes a circuit structure composed of electrical components such as resistors or capacitors, which can be configured according to actual needs, and no specific limitation is made here.

[0041] Specifically, the electrical signal conversion unit 11 may include a current-to-voltage conversion circuit. The electrical signal conversion unit 11 can convert the current signal provided by the detection output port out into a voltage signal, which is convenient for the signal processing board 10 to perform subsequent processing.

[0042] Optional, continue to refer to Figure 3 The signal processing board 10 also includes an analog-to-digital conversion unit 12; the analog-to-digital conversion unit 12 includes an analog signal input terminal and a digital signal output terminal; the analog signal input terminal is electrically connected to the digital signal output terminal.

[0043] The analog-to-digital conversion unit 12 includes an analog-to-digital converter.

[0044] Specifically, by setting up the analog-to-digital conversion unit 12, the analog electrical signal provided by the electrical signal conversion unit 11 can be converted into a digital electrical signal, which is convenient for subsequent storage or processing.

[0045] Optional, Figure 4 A schematic diagram of another downhole resistivity micro-scanner provided for an embodiment of this utility model is shown below. Figure 4 As shown, the downhole resistivity micro-scanner 100 also includes a storage unit 13; the storage unit 13 includes a storage port, which is electrically connected to the digital signal output terminal.

[0046] Storage unit 13 includes a digital memory.

[0047] Specifically, by setting up storage unit 13, the digital electrical signal output by analog-to-digital conversion unit 12 can be stored in storage unit 13. After the downhole resistivity micro-scanner 100 has completed the detection of the downhole surface to be tested, the downhole resistivity micro-scanner 100 is moved from downhole to surface. The storage unit 13 can then be electrically connected to an external reading device, so that the external reading device can read the digital electrical signal stored in storage unit 13. The digital electrical signal can then be further processed to generate image information that is easy to view, so that the testing personnel can determine the resistivity or oil content of the current downhole formation based on the image information.

[0048] Optional, Figure 5 A schematic diagram of a downhole resistivity micro-scanner provided for an embodiment of this utility model is shown below. Figure 5 As shown, the downhole resistivity micro-scanner 100 includes a first micro-scanning electrode group 201 and a second micro-scanning electrode group 202, and the signal processing board 10 includes a first signal processing board 101 and a second signal processing board 102; the first micro-scanning electrode group 201 includes three micro-scanning electrodes, and the first signal processing board 101 is electrically connected to each micro-scanning electrode in the first micro-scanning electrode group 201; the second micro-scanning electrode group 202 includes three micro-scanning electrodes, and the second signal processing board 102 is electrically connected to each micro-scanning electrode in the second micro-scanning electrode group 202.

[0049] Specifically, the three micro-scanning plates in the first micro-scanning plate group 201 are micro-scanning plate 211, micro-scanning plate 212, and micro-scanning plate 213. The three micro-scanning plates in the second micro-scanning plate group 202 are micro-scanning plate 221, micro-scanning plate 222, and micro-scanning plate 223. Thus, when the downhole resistivity micro-scanner 100 includes six micro-scanning plates, the micro-scanning plates can be set up in two groups, with each group corresponding to one signal processing board 10. This reduces the number of micro-scanning plates electrically connected to the signal processing board 10, thereby reducing the power consumption and temperature generated by the signal processing board 10 during operation, balancing the temperature of the two signal processing boards 10, and preventing a larger temperature rise in one signal processing board 10 due to different numbers of micro-scanning substrates electrically connected to the two signal processing boards 10, thus improving the service life of the two signal processing boards 10.

[0050] Optional, see reference Figure 5The first signal processing board 101 is integrally disposed with one of the micro-scanning plates 20 in the first micro-scanning plate group 201; and / or, the second signal processing board 102 is integrally disposed with one of the micro-scanning plates 20 in the second micro-scanning plate group 202. In this way, the overall size of the downhole resistivity micro-scanner 100 can be reduced and the integration of the downhole resistivity micro-scanner 100 can be improved.

[0051] It should be noted that, Figure 5 The diagram only shows the first signal processing board 101 integrated with one micro-scanning electrode 20 of the first micro-scanning electrode group 201; and the second signal processing board 102 integrated with one micro-scanning electrode 20 of the second micro-scanning electrode group 202. In other optional embodiments, the first signal processing board 101 may be integrated with one micro-scanning electrode 20 of the first micro-scanning electrode group 201, or the second signal processing board 102 may be integrated with one micro-scanning electrode 20 of the second micro-scanning electrode group 202, which can be configured according to actual needs.

[0052] Optional, Figure 6 A schematic diagram of another downhole resistivity micro-scanner provided in this embodiment of the present invention is shown below. Figure 6 As shown, the resistivity microscanner 100 also includes a heat insulation structure 30, in which the signal processing board 10 and the microscanning electrode 20 are placed.

[0053] The material of the insulation structure 30 includes glass or stainless steel, and the shape of the insulation structure 30 can be a cuboid or a cylinder, which can be set according to actual needs, and no specific limitation is made here.

[0054] Specifically, before placing the resistivity micro-scanner 100 downhole, the current temperature of the signal processing board 10 and the micro-scanning electrode 20 can be adjusted to room temperature or a set temperature. The method of temperature adjustment is not specifically limited here. By placing the signal processing board 10 and the micro-scanning electrode 20 in the heat insulation structure 30, the temperature impact of the high temperature downhole on the signal processing board 10 and the micro-scanning electrode 20 can be reduced during the process of placing the resistivity micro-scanner 100 downhole and during long-term exposure to the downhole environment. This reduces the rate of temperature rise of the signal processing board 10 and the micro-scanning electrode 20 and extends their service life.

[0055] It should be noted that the downhole depth can be 1000 meters to 4000 meters, and the signal processing board 10 and the micro-scanning plate 20 can withstand temperatures of about 150°C, so as to improve the applicable depth of the downhole resistivity micro-scanner 100 and improve the utilization rate of the downhole resistivity micro-scanner 100.

[0056] It is understood that the insulation structure 30 may include multiple openings, each corresponding to a detection input port, allowing the detection input port to contact the surface to be measured downhole through the openings. The insulation structure 30 may also include a detachable insertion port, which allows the signal processing board 10 and the micro-scanning electrode plate 20 to be placed within the insulation structure 30, or to be removed from it, facilitating their mobility.

[0057] Based on the same inventive concept, this utility model embodiment also provides a micro resistivity scanning wellbore imaging logging tool, which includes the technical features of the downhole resistivity micro scanner described above. Therefore, the micro resistivity scanning wellbore imaging logging tool has the beneficial effects of the downhole resistivity micro scanner described above, and the similarities can be referred to the above description.

[0058] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A downhole resistivity microscanner characterized by, include: At least one signal processing board and multiple micro-scanning plates; The signal processing board is electrically connected to at least two of the micro-scanning plates; The signal processing board includes multiple signal input ports and multiple signal output ports. The micro-scanning electrode includes a detection input port and a detection output port. The detection input port is in contact with the surface to be measured downhole, and the detection output port is electrically connected to the signal input port.

2. The downhole resistivity microscanner of claim 1, wherein, The signal processing board is integrally formed with one of the micro-scanning plates.

3. The downhole resistivity microscanner of claim 1, wherein, The signal processing board includes: an electrical signal conversion unit; The electrical signal conversion unit includes an electrical signal input terminal and an electrical signal output terminal, and the electrical signal input terminal is electrically connected to the detection output port.

4. The downhole resistivity micro-scanner according to claim 3, characterized in that, The signal processing board further includes: an analog-to-digital conversion unit; The analog-to-digital conversion unit includes an analog signal input terminal and a digital signal output terminal; the analog signal input terminal is electrically connected to the digital signal output terminal.

5. The downhole resistivity micro-scanner according to claim 4, characterized in that, Also includes: Storage unit; The storage unit includes a storage port, which is electrically connected to the digital signal output terminal.

6. The downhole resistivity micro-scanner according to claim 1, characterized in that, include: The first micro-scan electrode group and the second micro-scan electrode group, the signal processing board includes a first signal processing board and a second signal processing board; The first micro-scan electrode group includes three micro-scan electrodes, and the first signal processing board is electrically connected to each of the micro-scan electrodes in the first micro-scan electrode group; The second micro-scan electrode group includes three micro-scan electrodes, and the second signal processing board is electrically connected to each of the micro-scan electrodes in the second micro-scan electrode group.

7. The downhole resistivity micro-scanner according to claim 6, characterized in that, The first signal processing board is integrally disposed with one of the micro-scanning plates in the first micro-scanning plate group; and / or, The second signal processing board is integrally configured with one of the micro-scanning plates in the second micro-scanning plate group.

8. The downhole resistivity micro-scanner according to claim 1, characterized in that, Also includes: The signal processing board and the micro-scanning electrode plate are placed in the heat insulation structure.

9. A micro-resistivity scanning wellbore imaging logging tool, characterized in that, Includes the downhole resistivity micro-scanner as described in any one of claims 1 to 8.

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