Petroleum logging instrument imaging pole plate

Abstract

The utility model belongs to the technical field of petroleum logging instrument equipment, and discloses a petroleum logging instrument imaging polar plate which comprises a polar plate base body, a plurality of T-shaped holes penetrating through the upper end face and the lower end face are formed in the polar plate base body, a T-shaped electrode block is arranged in each T-shaped hole in a matched mode, the horizontal section of each T-shaped electrode block is matched with the large-diameter hole of the corresponding T-shaped hole, and the horizontal section of each T-shaped electrode block is matched with the large-diameter hole of the corresponding T-shaped hole. The vertical section of the T-shaped electrode block is in clearance fit with the small-diameter hole of the T-shaped hole, a sealing ring is arranged between the vertical section of the T-shaped electrode block and the small-diameter hole of the T-shaped hole, and the vertical section of the T-shaped electrode block extends out of the small-diameter hole of the T-shaped hole and then is detachably connected with the lower end face of the polar plate base body. The utility model aims to solve the problem that the damaged electrode block cannot be replaced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil logging instrument equipment, and particularly relates to an imaging electrode plate of an oil logging tool. Background Art

[0002] In the field of oil exploration and development, with the continuous improvement of the requirements for the complexity of underground geological structures and the accuracy of oil and gas resource distribution, the electrical imaging logging technology, as an advanced non-invasive detection method, has become increasingly important. By accurately measuring the resistivity distribution in the formation, this technology can construct a three-dimensional image of the underground geological structure, and it plays an irreplaceable role, especially in the identification and positioning of key areas such as geothermal wells and oil and gas reservoirs. With its characteristics of high resolution and high precision, the electrical imaging logging technology has greatly promoted the in-depth study of geological structures and the efficiency of oil and gas exploration and development.

[0003] In an electrical imaging logging system, the imaging electrode plate of the logging tool, as one of the core components, is directly responsible for collecting underground resistivity data and converting it into visual image information. For the imaging electrode plates of logging tools widely used in the current market, whether they are imported products or domestic devices, a forced interference fit injection molding assembly process is generally adopted to fix the electrode block and the substrate body. Although this assembly method ensures the structural stability to a certain extent, it also has limitations. Specifically, when some electrode blocks in the imaging electrode plate of the logging tool fail due to long-term use or environmental factors, due to the tight interference fit between the electrode block and the substrate body, it is extremely difficult or even impossible to replace the faulty electrode block individually. In this case, users often have to choose to scrap the imaging electrode plate as a whole, which not only results in high maintenance costs but also causes waste of resources. In addition, this non-maintainable design also increases the risk of logging operations, because once the imaging electrode plate fails, it will directly affect the progress and data quality of the entire logging task. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the utility model provides an imaging electrode plate of an oil logging tool, aiming to solve the problem that the electrode block cannot be replaced when it is damaged.

[0005] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] An imaging plate of a petroleum logging tool, comprising a plate substrate. A number of T-shaped holes penetrating the upper and lower end faces are provided on the plate substrate. A T-shaped electrode block is disposed in each T-shaped hole in a matching manner. The horizontal section of the T-shaped electrode block matches the large-diameter hole of the T-shaped hole, and the vertical section of the T-shaped electrode block has a clearance fit with the small-diameter hole of the T-shaped hole. A sealing ring is provided between the vertical section of the T-shaped electrode block and the small-diameter hole of the T-shaped hole. The vertical section of the T-shaped electrode block extends out of the small-diameter hole of the T-shaped hole and is detachably connected to the lower end face of the plate substrate.

[0007] Further, an external thread is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block near the end, and a nut is fitted on the external thread. The nut abuts against the lower end face of the plate substrate.

[0008] Further, an electrical connector is connected to the lower end face of the plate substrate. A wire groove is provided on the lower end face of the plate substrate, and a wire for connecting the T-shaped electrode block and the electrical connector is arranged in the wire groove.

[0009] Further, an insulating rubber layer is also provided on the lower end face of the plate substrate.

[0010] Further, the electrical connector and the lower end face of the plate substrate are connected by bolts.

[0011] Further, an annular groove is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block, and the sealing ring is sleeved in the annular groove.

[0012] Further, a number of the T-shaped holes are arranged in a uniformly distributed array on the plate substrate.

[0013] Further, the electrical connector is a four-core electrical connector.

[0014] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0015] For the imaging plate of a petroleum logging tool provided by the present utility model, the horizontal section of the T-shaped electrode block is fitted and installed in the large-diameter hole of the T-shaped hole, the vertical section of the T-shaped electrode block has a clearance fit with the small-diameter hole of the T-shaped hole, and the vertical section of the T-shaped electrode block extends out of the small-diameter hole of the T-shaped hole and is detachably connected to the lower end face of the plate substrate. At the same time, a sealing ring is provided between the vertical section of the T-shaped electrode block and the small-diameter hole of the T-shaped hole. This design ensures sealing and allows for the replacement of a faulty T-shaped electrode block. Specifically, when a certain T-shaped electrode block fails and needs to be replaced, only the detachable connection part between the T-shaped electrode block and the plate substrate needs to be released, then the T-shaped electrode block is taken out of the T-shaped hole, and a fault-free T-shaped electrode block is inserted into the T-shaped hole. There is no need to scrap the entire imaging plate, reducing the maintenance cost, avoiding waste of resources, and ensuring the progress of the logging task and the data quality.

[0016] In order to make the above - mentioned objects, features and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, detailed descriptions are as follows. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is the front view of an imaging plate of an oil logging tool of the present utility model;

[0019] Figure 2 is Figure 1 the sectional view taken along A - A in

[0020] Figure 3 It is the axonometric view of an imaging plate of an oil logging tool of the present utility model;

[0021] Figure 4 It is the top view of an imaging plate of an oil logging tool of the present utility model;

[0022] Figure 5 It is the bottom view of an imaging plate of an oil logging tool of the present utility model.

[0023] In the figure: 1 - plate substrate; 2 - T - shaped electrode block; 3 - sealing ring; 4 - nut; 5 - wire groove; 6 - electrical connector; 7 - wire; 8 - insulating glue layer; 9 - annular groove. Specific Embodiments

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0025] Combined with Figures 1 to 5As shown in the figure, the present utility model provides an imaging electrode plate for a petroleum logging tool, which includes an electrode plate base body 1. A number of T-shaped holes penetrating the upper and lower end faces are provided on the electrode plate base body 1. A T-shaped electrode block 2 is arranged in each T-shaped hole in a matching manner. The horizontal section of the T-shaped electrode block 2 matches the large-diameter hole of the T-shaped hole, and the vertical section of the T-shaped electrode block 2 is in clearance fit with the small-diameter hole of the T-shaped hole. A sealing ring 3 is arranged between the vertical section of the T-shaped electrode block 2 and the small-diameter hole of the T-shaped hole. After the vertical section of the T-shaped electrode block 2 extends out of the small-diameter hole of the T-shaped hole, it is detachably connected to the lower end face of the electrode plate base body 1.

[0026] Specifically, a number of uniformly distributed T-shaped holes are provided on the electrode plate base body 1. The T-shaped hole consists of a large-diameter hole and a small-diameter hole connected together to form a T-shaped structure. The large-diameter hole is used to accommodate the horizontal section of the T-shaped electrode block 2 to ensure a firm connection; the small-diameter hole is used for clearance fit with the vertical section of the T-shaped electrode block 2. The sealing ring 3 is installed between the vertical section of the T-shaped electrode block 2 and the small-diameter hole to effectively prevent downhole fluid from seeping between the electrode and the base body, ensuring the accuracy of logging data and the long-term reliability of the equipment. The structure of the T-shaped electrode block 2 matches the T-shaped hole. The width of its horizontal section is slightly smaller than the diameter of the large-diameter hole for easy insertion and tight fitting; the vertical section is designed as an elongated shape matching the small-diameter hole to ensure stability under clearance fit. After the vertical section of the T-shaped electrode block 2 extends out of the small-diameter hole, the T-shaped electrode block 2 is firmly fixed to the lower end face of the electrode plate base body 1 by means of threaded connection, snap connection or other detachable connection methods. This design not only ensures the stability of the electrode block but also facilitates subsequent maintenance and replacement.

[0027] It should be understood that the electrode plate base body 1 itself is an insulator. Exemplarily, the T-shaped electrode block 2 is made of a metal material with good electrical conductivity and corrosion resistance, such as copper alloy or silver-plated material. The sealing ring 3 is made of an elastic material with high temperature resistance, oil resistance and chemical corrosion resistance, such as fluororubber or silicone rubber.

[0028] The imaging electrode plate for a petroleum logging tool provided by the present invention not only has the advantages of compact structure and good sealing performance, but also is convenient for replacing the electrode block, greatly improving the efficiency and reliability of logging operations.

[0029] In an implementable manner, as Figure 2 shown, an external thread is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block 2 near the end position. A nut 4 is fitted on the external thread, and the nut 4 abuts against the lower end face of the electrode plate base body 1. The detachable connection between the vertical section of the T-shaped electrode block 2 and the lower end face of the electrode plate base body 1 is realized by using the nut 4 fitted with the external thread.

[0030] That is to say, on the outer cylindrical surface of the vertical section of the T-shaped electrode block 2, near its end position, a section of external thread is designed. The specification of this external thread needs to be determined according to the actual application requirements to ensure a tight and reliable connection with the subsequent mating nut 4. The nut 4 is made of a metal that is compatible with the material of the T-shaped electrode block 2, corrosion-resistant, and has sufficient strength, such as stainless steel or copper alloy. The internal thread of the nut matches the external thread to ensure the tightness and sealing of the connection. After the vertical section of the T-shaped electrode block 2 passes through the small-diameter hole of the T-shaped hole and extends a certain length, the nut 4 is screwed tightly onto the external thread until its bottom surface abuts against the lower end surface of the electrode plate base 1. At this time, the T-shaped electrode block 2 is firmly fixed on the electrode plate base 1.

[0031] When the T-shaped electrode block 2 needs to be replaced, simply use an appropriate tool (such as a wrench or a screwdriver) to rotate the nut 4 counterclockwise to loosen it, and then the T-shaped electrode block 2 can be easily removed from the electrode plate base 1. This detachable connection method not only simplifies the replacement process but also reduces the maintenance cost and time. In summary, by mating the nut 4 on the external thread to achieve the detachable connection between the T-shaped electrode block 2 and the lower end surface of the electrode plate base 1, not only improves the overall performance and reliability of the logging tool imaging electrode plate but also facilitates subsequent maintenance and replacement work.

[0032] In an implementable manner, as Figure 2 and Figure 5 shown, in order to more effectively realize the connection between the T-shaped electrode block 2 and the external circuit, an electrical connector 6 is connected to the lower end surface of the electrode plate base 1. A wire groove 5 is opened on the lower end surface of the electrode plate base 1, and a wire 7 for connecting the T-shaped electrode block 2 and the electrical connector 6 is arranged in the wire groove 5.

[0033] Specifically, according to the electrical requirements and working environment of the logging tool, a suitable waterproof, corrosion-resistant, and highly reliable electrical connector is selected. The electrical connector 6 is installed on the lower end surface of the electrode plate base 1, usually in a position convenient for docking with external devices. During installation, it is necessary to ensure that the electrical connector 6 is firmly fixed and will not loosen or fall off due to vibration during the logging process. On the lower end surface of the electrode plate base 1, according to the layout of the electrical connector 6 and the T-shaped electrode block 2, the wire groove 5 is reasonably opened. The width and depth of the wire groove 5 need to be determined according to the diameter and quantity of the wires to ensure that the wires can be laid neatly and tightly in the wire groove. Exemplarily, a high-temperature-resistant, oil-resistant, and chemically corrosion-resistant insulated wire is selected as the wire 7 for connecting the T-shaped electrode block 2 and the electrical connector 6. One end of the wire 7 is connected to the contact point of the T-shaped electrode block 2 by welding, crimping, or plugging, and the other end is laid along the wire groove 5 to the corresponding pin of the electrical connector 6. During the wiring process, it is necessary to ensure that the wires are not exposed, crossed, or twisted, and are firmly fixed.

[0034] To ensure the sealing and safety during the logging process, after the wire 7 is laid, the installation parts of the wire duct 5 and the electrical connector 6 need to be sealed. Sealant, gaskets or potting materials can be used to fill the gaps in the wire duct and cover the area around the electrical connector to prevent downhole fluids from seeping in and causing short circuits or corrosion.

[0035] Preferably, as Figure 2 shown, to improve the electrical safety and insulation performance of the equipment, an insulating glue layer 8 is added to the lower end face of the plate base 1. The insulating glue layer 8 should be made of insulating materials with high insulation strength, high temperature resistance, oil resistance and chemical corrosion resistance. Exemplarily, the insulating glue layer 8 is made of vulcanized rubber, which not only has good insulation performance but also can maintain stable physical and chemical properties in a complex downhole environment.

[0036] By adding the insulating glue layer 8, the imaging plate of the petroleum logging tool not only improves the electrical safety but also enhances the overall protection ability of the equipment. The insulating glue layer 8 can effectively isolate the direct contact between the downhole fluid and the circuit system, preventing electrical faults such as short circuits and leakage. At the same time, the insulating glue layer 8 can also provide additional protection for key components such as the electrical connector 6 and the wire 7, extending the service life of the equipment.

[0037] In one implementable way, as Figure 5 shown, the electrical connector 6 is bolted to the lower end face of the plate base 1. Specifically, on the lower end face of the plate base 1, several connection holes are opened according to the installation position and size requirements of the electrical connector 6. The number and layout of the connection holes need to ensure that the electrical connector can be stably fixed on the plate base and facilitate subsequent maintenance and replacement. Exemplarily, five connection holes are opened. Bolts and nuts that are compatible with the material of the plate base 1 and have sufficient strength are selected as the connecting parts. The diameter, length and thread specification of the bolts need to match the connection holes to ensure the tightness and sealing of the connection. The nuts are selected with specifications matching the bolts to provide sufficient locking force. When the electrical connector 6 needs to be replaced or maintained, simply loosen the bolts and nuts, and the electrical connector 6 can be easily removed from the plate base 1. This bolt connection method not only improves the stability and reliability of the connection but also facilitates subsequent maintenance and replacement work.

[0038] In one implementable way, as Figure 2As shown, an annular groove 9 is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block 2, and the sealing ring 3 is sleeved in the annular groove 9. The annular groove 9 is designed on the outer cylindrical surface of the vertical section of the T-shaped electrode block 2. The dimensions of the annular groove (including width, depth and shape) need to be determined according to the specifications of the selected sealing ring and the sealing requirements to ensure that the sealing ring can be tightly and stably installed in the groove. The sealing ring 3 is sleeved in the annular groove 9, and the vertical section of the T-shaped electrode block 2 is inserted into the small-diameter hole of the T-shaped hole, so that the sealing ring is in close contact with the wall surface of the small-diameter hole of the T-shaped hole, forming an effective sealing structure.

[0039] In one embodiment, as Figure 4 shown, a number of T-shaped holes are arranged in a uniform array on the plate base 1. Specifically, the layout of the T-shaped holes on the plate base 1 needs to be designed according to the imaging requirements and data acquisition density of the logging tool. Generally, in order to obtain more detailed logging images and higher data acquisition accuracy, the T-shaped holes are designed in the form of a uniform array, that is, each T-shaped hole is evenly distributed on the plate base, and the distance between them is equal or varies according to a specific rule. The number of T-shaped holes is determined according to actual needs to ensure sufficient sampling points and imaging coverage. Exemplarily, 9 T-shaped holes are arranged.

[0040] In one embodiment, the electrical connector 6 is a four-core electrical connector. In oil logging operations, the imaging plate is connected to external devices through a four-core electrical connector to achieve real-time data transmission and imaging display. Using a four-core electrical connector as the electrical interface of the imaging plate of the oil logging tool not only improves the stability and reliability of data transmission, but also simplifies the wiring design and maintenance work.

[0041] Preferably, the upper end surface of the T-shaped electrode block 2 is flush with the upper end surface of the plate base 1. The design that the upper end surface of the T-shaped electrode block is flush with the upper end surface of the plate base helps to reduce the friction and wear between the electrode block and the surrounding environment during the movement of the logging tool in the well, thereby prolonging the service life of the electrode block.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present utility model, unless otherwise clearly specified and defined, terms such as "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0046] In the present utility model, terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0047] Finally, it should be noted that the above-described embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present utility model can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An imaging plate for a petroleum logging instrument, characterized in that: The invention comprises a plate substrate (1), wherein a plurality of T-shaped holes penetrating the upper and lower end surfaces are provided on the plate substrate (1), a T-shaped electrode block (2) is matched and arranged in each of the T-shaped holes, the horizontal section of the T-shaped electrode block (2) matches the large-diameter hole of the T-shaped hole, the vertical section of the T-shaped electrode block (2) is gap-matched with the small-diameter hole of the T-shaped hole, a sealing ring (3) is arranged between the vertical section of the T-shaped electrode block (2) and the small-diameter hole of the T-shaped hole, and the vertical section of the T-shaped electrode block (2) is detachably connected to the lower end surface of the plate substrate (1) after extending out of the small-diameter hole of the T-shaped hole.

2. The imaging plate of a petroleum logging instrument according to claim 1, characterized in that: An external thread is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block (2) near the end, and a nut (4) is fitted on the external thread, and the nut (4) abuts against the lower end surface of the electrode substrate (1).

3. The imaging plate of a petroleum logging instrument according to claim 1, characterized in that: The lower end surface of the electrode substrate (1) is connected to an electrical connector (6), and a wire groove (5) is provided on the lower end surface of the electrode substrate (1), wherein a wire (7) for connecting the T-shaped electrode block (2) and the electrical connector (6) is arranged in the wire groove (5).

4. The imaging plate of a petroleum logging instrument according to claim 3, characterized in that: The lower end surface of the electrode substrate (1) is also covered with an insulating rubber layer (8).

5. The imaging plate of a petroleum logging instrument according to claim 3, characterized in that: The electrical connector (6) is connected to the lower end surface of the electrode substrate (1) by means of bolts.

6. The imaging plate of a petroleum logging instrument according to claim 1, characterized in that: An annular groove (9) is provided on the outer cylindrical surface of the vertical section of the T-shaped electrode block (2), and the sealing ring (3) is sleeved in the annular groove (9).

7. The imaging plate of a petroleum logging instrument according to claim 1, characterized in that: The upper end surface of the T-shaped electrode block (2) is flush with the upper end surface of the electrode plate substrate (1).

8. The imaging plate of a petroleum logging instrument according to claim 1, characterized in that: A plurality of T-shaped holes are evenly distributed in an array and are arranged on the electrode substrate (1).

9. The imaging plate of a petroleum logging instrument according to claim 3, characterized in that: The electrical connector (6) is a four-core electrical connector.

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