An electric imaging pole plate for petroleum logging

Abstract

The application discloses a petroleum logging electric imaging polar plate, and belongs to the technical field of electric imaging polar plates. The electric imaging polar plate comprises an upper shell and a lower shell. The lower shell comprises a mounting shell, an outer cover and an inner cover. The outer cover is used for plugging the lower shell. The mounting shell is arranged in the lower shell. The inner cover is used for plugging the mounting shell. An accommodation space is formed in the mounting shell. A polar plate main body is arranged in the accommodation space. A first heat insulation plate is arranged between the mounting shell and the inner wall of the lower shell. A second heat insulation plate is arranged between the inner wall of the mounting shell and the polar plate main body. The upper shell and the lower shell are detachably connected. A support frame, a driving mechanism and at least two guide arms are arranged on the top of the upper shell. The guide arms are movably connected with the support frame. One end of the guide arms is connected with the driving mechanism. A roller is arranged on the other end of the guide arms. The roller can abut against the inner wall of a wellbore. The driving mechanism can drive the other end of the guide arms to move in the direction away from or close to the inner wall of the wellbore.

Description

Technical Field

[0001] This invention relates to the field of electrical imaging electrode technology, and more particularly to an electrical imaging electrode for oil well logging. Background Technology

[0002] In the field of oil exploration and development, electrical imaging logging technology has become an important geophysical exploration tool due to its ability to provide intuitive and rich formation information. The principle of an electrical imaging plate in oil logging is to use an electrode array on the plate to emit current into the formation, and then measure the distribution of the current in different directions to obtain the resistivity information of the formation. By processing and analyzing this resistivity information, an electrical imaging image of the formation can be obtained, thus intuitively displaying the structure and characteristics of the formation. As the core component of the electrical imaging logging instrument in this technology, the performance of the electrical imaging plate plays a decisive role in the quality of the logging data and the subsequent accuracy of analysis.

[0003] However, the sealing structure of traditional electrical imaging plates is not perfect, making it easy for liquids, gases, and other substances in the well to seep into the instrument, affecting the normal operation of the circuit and thus reducing the quality of logging data. Furthermore, in the complex electromagnetic environment downhole, traditional electrical imaging plates have weak anti-interference capabilities, leading to significant errors in the acquired data. In addition, the operation of traditional electrical imaging plates inside logging instruments is complex and unstable, increasing the time and cost of logging operations and potentially causing malfunctions due to improper installation, seriously affecting the smooth progress of logging work. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical imaging electrode plate for oil well logging, so as to solve the technical problems of weak anti-interference ability and poor stability of traditional electrical imaging electrodes in the prior art.

[0005] Based on the above concept, the technical solution adopted by this invention is as follows:

[0006] An electrical imaging electrode for oil well logging, comprising:

[0007] The lower housing includes a mounting shell, an outer cover, and an inner cover. The outer cover is used to seal the lower housing. The mounting shell is disposed inside the lower housing. The inner cover is used to seal the mounting shell. An accommodating space is formed inside the mounting shell. The electrode plate body is disposed in the accommodating space. A first heat insulation plate is disposed between the mounting shell and the inner wall of the lower housing. A second heat insulation plate is disposed between the inner wall of the mounting shell and the electrode plate body.

[0008] The upper housing is detachably connected to the lower housing. The top of the upper housing is provided with a support frame, a drive mechanism, and at least two guide arms. The support frame is fixedly connected to the top of the upper housing. The guide arms are movably connected to the support frame. One end of the guide arm is connected to the drive mechanism. The other end of the guide arm is provided with a roller. The roller can abut against the inner wall of the wellbore. The drive mechanism can drive the other end of the guide arm to move in a direction away from or close to the inner wall of the wellbore.

[0009] Preferably, a movable plate and a shock-absorbing spring are provided in the accommodating space. One end of the shock-absorbing spring is connected to the bottom of the mounting shell, and the other end of the shock-absorbing spring is connected to the bottom of the movable plate. The side wall of the movable plate is slidably connected to the second heat insulation plate, and the electrode plate body is disposed on the movable plate.

[0010] Preferably, a first cavity is formed between the first heat insulation plate and the inner wall of the lower housing, and a second cavity is formed between the second heat insulation plate and the inner wall of the mounting housing, wherein the first cavity and / or the second cavity are filled with coolant.

[0011] Preferably, the bottom of the outer cover is provided with an edge, a protrusion and a cover body from the outside to the inside. The edge is threaded to the lower housing. The top of the lower housing is provided with a slot. The protrusion is engaged with the slot. The cover body is used to seal the lower housing.

[0012] Preferably, a sealing groove is formed between the inner wall of the lower housing and the first heat insulation plate, and a sealing flange is formed by the bottom side of the cover protruding downward, which can be engaged in the sealing groove.

[0013] Preferably, a first sealing ring is provided between the protrusion and the slot.

[0014] Preferably, the inner cover is snapped onto the top of the mounting shell, and a sealing gasket is provided between the mounting shell and the inner cover.

[0015] Preferably, the driving mechanism includes a drive motor, a threaded rod, and a threaded block. The motor shaft of the drive motor is coaxially connected to the threaded rod, and the drive motor can drive the threaded rod to rotate along its own axis. The threaded block is threadedly connected to the threaded rod, and the guide arm is hinged to the threaded hole.

[0016] Preferably, there are two guide arms, which are symmetrically arranged on both sides of the threaded rod.

[0017] Preferably, the guide arm has a guide groove that extends along the length of the guide arm, and the support frame has a positioning post that is slidably connected to the guide groove.

[0018] The beneficial effects of this invention are:

[0019] The oil well logging electro-imaging electrode plate proposed in this invention, through the cooperation of a first heat insulation plate, a second heat insulation plate, an outer cover, and an inner cover, forms a double seal, effectively preventing liquids and gases from entering the containment space, thus improving the stability and reliability of the electrode plate. Furthermore, the double-layer heat insulation plate enhances the electrode plate's heat insulation performance, effectively reducing the impact of high downhole temperatures on the electrode plate body and ensuring stable operation in high-temperature environments, thereby improving the accuracy and reliability of logging data. Secondly, the support frame fixed to the top of the upper shell provides stable support for the guide arm. The drive mechanism can drive the other end of the guide arm to move away from or towards the wellbore inner wall, cooperating with rollers to abut against the wellbore inner wall, making the movement of the electrode plate within the wellbore more smooth and precise. This adjustable guiding structure can adapt to wellbores of different diameters, improving the electrode plate's versatility and adaptability, reducing collisions and friction between the electrode plate and the wellbore inner wall, and extending the electrode plate's service life. In summary, the oil well logging electrical imaging electrode plate of the present invention has improved in terms of heat insulation performance, sealing performance, ease of installation and maintenance, wellbore adaptability and operational stability. It can effectively solve the shortcomings of existing electrical imaging electrode plates in terms of sealing, heat insulation and environmental adaptability, and provide more accurate, reliable and efficient support for oil well logging work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the oil well logging electrical imaging electrode plate provided in an embodiment of the present invention;

[0021] Figure 2 This is an exploded structural diagram of the oil well logging electrical imaging electrode plate provided in an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the oil well logging electrical imaging electrode plate provided in an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 A magnified view of point A;

[0024] Figure 5 yes Figure 3 Enlarged view of point B.

[0025] In the picture:

[0026] 1. Lower housing; 10. Accommodation space; 11. Mounting shell; 12. Outer cover; 121. Edge; 122. Protrusion; 123. Cover body; 124. Sealing flange; 13. Inner cover; 131. Sealing gasket; 14. First heat insulation plate; 15. Second heat insulation plate; 16. Movable plate; 17. Shock-absorbing spring; 18. Slot; 19. Sealing groove; 101. First sealing ring; 102. Second sealing ring; 103. First cavity; 104. Second cavity;

[0027] 2. Upper housing; 21. Support frame; 211. Positioning post; 22. Drive mechanism; 221. Drive motor; 222. Threaded rod; 223. Threaded block; 23. Guide arm; 231. Guide groove; 232. Roller;

[0028] 3. Electrode body. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] See Figures 1 to 5The oil well logging electro-imaging electrode plate provided in this embodiment of the invention includes an upper shell 2 and a lower shell 1. The lower shell 1 includes a mounting shell 11, an outer cover 12, and an inner cover 13. The outer cover 12 is used to seal the lower shell 1. The mounting shell 11 is disposed inside the lower shell 1. The inner cover 13 is used to seal the mounting shell 11. An accommodating space 10 is formed inside the mounting shell 11. The electrode plate body 3 is disposed within the accommodating space 10. A first heat insulation plate 14 is disposed between the mounting shell 11 and the inner wall of the lower shell 1. A second heat insulation plate 15 is disposed between the inner wall of the mounting shell 11 and the electrode plate body 3. The upper shell 2 and the lower shell... 1. Detachable connection: The top of the upper housing 2 is provided with a support frame 21, a drive mechanism 22 and at least two guide arms 23. The support frame 21 is fixedly connected to the top of the upper housing 2. The guide arms 23 are movably connected to the support frame 21. One end of the guide arm 23 is connected to the drive mechanism 22. The other end of the guide arm 23 is provided with a roller 232. The roller 232 can abut against the inner wall of the well. The drive mechanism 22 can drive the other end of the guide arm 23 to move away from or close to the inner wall of the well.

[0034] The oil well logging electro-imaging electrode plate proposed in this invention, through the cooperation of a first heat insulation plate 14, a second heat insulation plate 15, an outer cover 12, and an inner cover 13, forms a double seal, effectively preventing liquids and gases from entering the containment space 10, thus improving the stability and reliability of the electrode plate. Furthermore, the double-layer heat insulation plate enhances the electrode plate's heat insulation performance, effectively reducing the impact of downhole high temperatures on the electrode plate body 3, ensuring stable operation of the electrode plate in high-temperature environments, thereby improving the accuracy and reliability of logging data. Secondly, the support frame 21, fixed to the top of the upper housing 2, provides stable support for the guide arm 23. The drive mechanism 22 can drive the other end of the guide arm 23 to move away from or towards the inner wall of the wellbore, cooperating with the roller 232 to abut against the inner wall of the wellbore, making the movement of the electrode plate within the wellbore more smooth and precise. This adjustable guiding structure can adapt to wellbores of different diameters, improving the versatility and adaptability of the electrode plate, reducing collisions and friction between the electrode plate and the inner wall of the wellbore, and extending the service life of the electrode plate. In summary, the oil well logging electrical imaging electrode plate of the present invention has improved in terms of heat insulation performance, sealing performance, ease of installation and maintenance, wellbore adaptability and operational stability. It can effectively solve the shortcomings of existing electrical imaging electrode plates in terms of sealing, heat insulation and environmental adaptability, and provide more accurate, reliable and efficient support for oil well logging work.

[0035] To prevent damage to the electrode body 3 when the oil well logging electro-imaging electrode plate is subjected to vibration or impact, a movable plate 16 and a shock-absorbing spring 17 are provided in the accommodating space 10. One end of the shock-absorbing spring 17 is connected to the bottom of the mounting shell 11, and the other end of the shock-absorbing spring 17 is connected to the bottom of the movable plate 16. The side wall of the movable plate 16 is slidably connected to the second heat insulation plate 15, and the electrode body 3 is mounted on the movable plate 16. Therefore, when the oil well logging electro-imaging electrode plate is subjected to vibration or impact during operation, the shock-absorbing spring 17 can effectively absorb and buffer these impact forces, reducing the possibility of the impact force being directly transmitted to the electrode body 3, thereby reducing the risk of damage to the electrode body 3 due to vibration or impact, ensuring the structural integrity and normal function of the electrode body 3, and extending the service life of the electrode plate. The slidable connection between the side wall of the movable plate 16 and the second heat insulation plate 15 ensures that the movement direction of the movable plate 16 is stable and controllable during shock absorption, further enhancing the stability and reliability of the shock absorption effect. The electrode body 3 is mounted on the movable plate 16, which allows the damping effect of the shock-absorbing spring 17 to be directly and evenly transmitted to the electrode body 3, providing all-round protection for the electrode body 3 and ensuring its stable operation in complex downhole environments.

[0036] To further improve the heat insulation performance of the heat insulation plates, a first cavity 103 is formed between the first heat insulation plate 14 and the inner wall of the lower shell 1, and a second cavity 104 is formed between the second heat insulation plate 15 and the inner wall of the mounting shell 11. The first cavity 103 and / or the second cavity 104 are filled with coolant, thereby enhancing the heat insulation performance of the heat insulation plates. The coolant can absorb and carry away heat, further preventing the transfer of high external temperatures to the electrode body 3, effectively reducing the temperature of the environment in which the electrode body 3 is located, creating favorable conditions for its stable operation, and improving the accuracy and reliability of logging data. Secondly, the cavity design filled with coolant increases the path length and resistance of heat transfer, making it more difficult for heat to penetrate and reach the electrode body 3, thus enhancing the overall heat insulation effect.

[0037] Specifically, the bottom of the outer cover 12 has an edge 121, a protrusion 122, and a cover body 123 arranged from the outside to the inside. The edge 121 is threadedly connected to the lower housing 1, and the top of the lower housing 1 has a slot 18, into which the protrusion 122 engages. The cover body 123 is used to seal the lower housing 1. First, the edge 121 and the lower housing 1 are connected by a thread, providing a stable and detachable connection. The threaded connection is not only easy to operate but also provides strong connection force, ensuring that the outer cover 12 will not easily loosen or fall off under normal working conditions, thus enhancing the stability and reliability of the overall structure. The slot 18 on the top of the lower housing 1 engages with the protrusion 122 of the outer cover 12, and the engaging structure adds an additional fixing point and positioning function to the connection between the outer cover 12 and the lower housing 1. It can effectively prevent the outer cover 12 from rotating or shifting after installation, further improving the tightness and stability of the connection and reducing the risk of seal failure due to loosening. The design of the cover 123 can effectively seal the lower shell 1, forming a complete closed space, thereby effectively protecting the internal electrode body 3 from the influence of the external environment, such as the intrusion of dust and moisture, and ensuring the normal operation and service life of the electrode body 3.

[0038] Specifically, a first sealing ring 101 is provided between the protrusion 122 and the slot 18. The first sealing ring 101 can enhance the sealing performance at the connection between the protrusion 122 and the slot 18, effectively preventing external substances such as liquids, gases and tiny particles from entering the interior through the connection, thus avoiding damage to the internal structure of the accommodating space 10 and the electrode plate body 3 caused by these impurities.

[0039] More specifically, a sealing groove 19 is formed between the inner wall of the lower housing 1 and the first heat insulation plate 14, and a sealing flange 124 is formed by the downward protrusion of the bottom side of the cover 123, which can be engaged in the sealing groove 19. This engagement structure further enhances the sealing performance between the outer cover 12 and the lower housing 1. The tight fit between the sealing flange 124 and the sealing groove 19 effectively blocks the intrusion path of external substances, making it difficult for impurities such as dust, moisture, and oil to enter the interior of the electrode plate.

[0040] More specifically, in order to further improve the sealing performance, a second sealing ring 102 is provided between the sealing flange 124 and the sealing groove 19, thereby enhancing the sealing performance at the connection between the sealing flange 124 and the sealing groove 19.

[0041] Specifically, the inner cover 13 is snapped onto the top of the mounting housing 11, and a sealing gasket 131 is provided between the mounting housing 11 and the inner cover 13. This snap-fit ​​connection is simple and secure, ensuring the inner cover 13 remains stable on the top of the mounting housing 11 and is not easily dislodged or loosened. This effectively prevents the inner cover 13 from shifting due to vibration or impact, ensuring reliable sealing. The sealing gasket 131 enhances the sealing performance between the mounting housing 11 and the inner cover 13, filling the tiny gaps between them and preventing external dust, moisture, liquids, and other impurities from entering the interior of the mounting housing 11.

[0042] Regarding the drive mechanism 22, it includes a drive motor 221, a threaded rod 222, and a threaded block 223. The motor shaft of the drive motor 221 is coaxially connected to the threaded rod 222, enabling the drive motor 221 to drive the threaded rod 222 to rotate along its own axis. The threaded block 223 is threadedly connected to the threaded rod 222, and the guide arm 23 is hinged to the threaded hole. The drive motor 221 provides a stable and controllable power source for the movement of the guide arm 23. The drive motor 221 can precisely control the speed and direction of rotation, thereby achieving precise drive of the rotation of the threaded rod 222 and ensuring the accuracy and stability of the movement of the guide arm 23. The threaded connection between the threaded rod 222 and the threaded block 223 has a self-locking function. After the drive motor 221 stops working, the threaded block 223 can remain stable in its current position and will not move unexpectedly due to vibration of the electrode plate or external interference, thus ensuring the stability of the guide arm 23's position and improving the reliability of the electrode plate's operation within the wellbore. This transmission method can convert the rotational motion of the drive motor 221 into the linear motion of the threaded block 223, thereby precisely controlling the extension and retraction of the guide arm 23. This allows the electrode plate to better adapt to wellbore of different diameters, improving the versatility and adaptability of the electrode plate in complex wellbore environments.

[0043] Specifically, two guide arms 23 are provided, symmetrically arranged on both sides of the threaded rod 222, providing a more balanced and stable support force. This allows the pressure and friction from the wellbore wall to be evenly distributed when the electrode plate moves within the wellbore, effectively preventing tilting or offset during movement and ensuring the smoothness and straightness of the electrode plate's operation. The symmetrical distribution design ensures that the forces generated by the guide arms 23 during operation are balanced, reducing the torsional and deformation effects on the drive mechanism 22 and the entire electrode plate structure.

[0044] It is understood that in other embodiments, three or four guide arms 23 may also be provided, arranged in a circumferential array around the threaded rod 222 at intervals, and this is not limited here.

[0045] Specifically, a guide groove 231 is provided on the guide arm 23, extending along the length of the guide arm 23. A positioning post 211 is provided on the support frame 21, and the positioning post 211 is slidably connected to the guide groove 231. The cooperation between the guide groove 231 and the positioning post 211 provides precise guidance for the movement of the guide arm 23. This ensures that the guide arm 23 can move stably along a predetermined straight direction under the action of the drive mechanism 22, avoiding deviation or swaying of the guide arm 23 during movement, thereby improving the accuracy and stability of the electrode plate movement in the wellbore and ensuring the quality of logging data. This guiding structure effectively restricts the degrees of freedom of the guide arm 23, preventing unnecessary displacement or rotation in directions other than the predetermined direction. It enhances the reliability and predictability of the guide arm 23 during operation and reduces potential failures and errors caused by the unstable movement of the guide arm 23.

[0046] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrical imaging electrode plate for oil well logging, characterized in that, include: The lower housing (1) includes a mounting shell (11), an outer cover (12), and an inner cover (13). The outer cover (12) is used to seal the lower housing (1). The mounting shell (11) is disposed inside the lower housing (1). The inner cover (13) is used to seal the mounting shell (11). An accommodating space (10) is formed inside the mounting shell (11). The electrode plate body (3) is disposed in the accommodating space (10). The mounting shell (11) and the inner cover of the lower housing (1) are connected. A first heat insulation plate (14) is provided between the walls, and a second heat insulation plate (15) is provided between the inner wall of the mounting shell (11) and the electrode body (3). A first cavity (103) is formed between the first heat insulation plate (14) and the inner wall of the lower shell (1), and a second cavity (104) is formed between the second heat insulation plate (15) and the inner wall of the mounting shell (11). The first cavity (103) and / or the second cavity (104) are filled with coolant. The upper housing (2) is detachably connected to the lower housing (1). The top of the upper housing (2) is provided with a support frame (21), a drive mechanism (22), and at least two guide arms (23). The support frame (21) is fixedly connected to the top of the upper housing (2). The guide arms (23) are movably connected to the support frame (21). One end of the guide arm (23) is connected to the drive mechanism (22). The other end of the guide arm (23) is provided with a roller (232). The roller (232) can abut against the inner wall of the well. The drive mechanism (22) can drive the other end of the guide arm (23) to move in a direction away from or close to the inner wall of the well. The guide arm (23) is provided with a guide groove (231). The guide groove (231) extends along the length direction of the guide arm (23). The support frame (21) is provided with a positioning post (211). The positioning post (211) is slidably connected to the guide groove (231). The bottom of the outer cover (12) is provided with an edge (121), a protrusion (122) and a cover body (123) from the outside to the inside. The edge (121) is threaded to the lower housing (1). The top of the lower housing (1) is provided with a slot (18). The protrusion (122) is engaged in the slot (18). The cover body (123) is used to seal the lower housing (1). A sealing groove (19) is formed between the inner wall of the lower housing (1) and the first heat insulation plate (14), and a sealing flange (124) is formed by the bottom side of the cover (123) protruding downwards. The sealing flange (124) can be engaged in the sealing groove (19).

2. The petroleum logging electrical imaging electrode plate according to claim 1, characterized in that, The accommodating space (10) is provided with a movable plate (16) and a shock-absorbing spring (17). One end of the shock-absorbing spring (17) is connected to the bottom of the mounting shell (11), and the other end of the shock-absorbing spring (17) is connected to the bottom of the movable plate (16). The side wall of the movable plate (16) is slidably connected to the second heat insulation plate (15). The electrode plate body (3) is disposed on the movable plate (16).

3. The petroleum logging electrical imaging electrode plate according to claim 1, characterized in that, A first sealing ring (101) is provided between the protrusion (122) and the slot (18).

4. The petroleum logging electrical imaging electrode plate according to claim 1, characterized in that, The inner cover (13) is snapped onto the top of the mounting shell (11), and a sealing gasket (131) is provided between the mounting shell (11) and the inner cover (13).

5. The petroleum logging electrical imaging electrode plate according to any one of claims 1-4, characterized in that, The drive mechanism (22) includes a drive motor (221), a threaded rod (222), and a threaded block (223). The motor shaft of the drive motor (221) is coaxially connected to the threaded rod (222). The drive motor (221) can drive the threaded rod (222) to rotate along its own axis. The threaded block (223) is threadedly connected to the threaded rod (222). The guide arm (23) is hinged to the threaded hole.

6. The petroleum logging electrical imaging electrode plate according to claim 5, characterized in that, Two guide arms (23) are provided, and the two guide arms (23) are symmetrically arranged on both sides of the threaded rod (222).

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