Resistivity imaging device
By employing an adjustable electrode structure in the resistivity imaging device, the problem of electrode separation from the wellbore was solved, thereby improving the accuracy and adaptability of resistivity imaging measurements and ensuring the accuracy of the current field distribution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-03
AI Technical Summary
The electrodes of existing resistivity imaging measuring instruments cannot be adjusted according to the wellbore size, causing the electrodes to separate from the well wall, which affects the accuracy and adaptability of the detection results.
A resistivity imaging device was designed, in which electrodes are mounted on an adjustable mounting plate. The electrodes are tightly fitted to the well wall through a slip ring and an adjustable rotating plate structure. The position of the electrodes is adjusted by the slip ring and a limiting device to adapt to wellbore with different diameters.
This improves the accuracy and adaptability of resistivity imaging measurements, ensures close contact between the electrode and the well wall during measurement, avoids distortion of the current field distribution, and enhances the reliability of the detection results.
Smart Images
Figure CN224079130U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mine geological measurement technology, and specifically relates to a resistivity imaging device. Background Technology
[0002] Resistivity measurement within wells is one of the primary methods currently used to determine formation conditions. Resistivity imaging instruments are available to measure formation resistivity and image the formation environment accordingly. Their working principle is based on the differences in conductivity between different materials. When an external electric field is applied to the surface of an object, a certain current field distribution is formed inside the object. This current field distribution is closely related to the object's conductivity. By placing electrodes at different locations on the object's surface, the voltage values at these locations can be measured. These voltage values reflect the distribution of the current field inside the object. When performing resistivity measurement imaging within wells, to ensure measurement accuracy and improve image resolution, the electrode array of the resistivity imaging scanner must be tightly fitted to the well wall. Gaps may exist, potentially distorting the current field distribution and affecting the accurate identification of fracture dip angles, orientations, and dissolution cavities.
[0003] The electrodes of existing resistivity imaging measuring instruments are generally distributed in a ring around their perimeter. The position of the electrodes cannot be adjusted according to the size of the wellbore, which not only results in poor adaptability, but also may cause them to slide and separate from the well wall during the measurement process, affecting the accuracy of the test results. Utility Model Content
[0004] The purpose of this invention is to provide a resistivity imaging device with a simple structure and reasonable design in order to solve the above problems.
[0005] This utility model achieves the above objectives through the following technical solutions:
[0006] A resistivity imaging device includes a resistivity imaging measuring instrument. Multiple mounting plates are arranged in a ring around the middle section of the resistivity imaging measuring instrument. Electrodes electrically connected to the resistivity imaging measuring instrument are fixedly mounted on each of the mounting plates. Two symmetrically arranged slip rings are slidably sleeved on the middle section of the resistivity imaging measuring instrument. First connecting structures are installed on the outer walls of the slip rings and the ends of the mounting plates. Multiple adjusting rotating plates are correspondingly arranged between the ends of the mounting plates and the slip rings. Second connecting structures are provided at both ends of each adjusting rotating plate. The two ends of the adjusting rotating plates are rotatably connected to the slip rings and the ends of the mounting plates respectively through the cooperation of the first and second connecting structures. A limiting device is also provided on the slip rings.
[0007] As a further optimization of this utility model, a connecting seat is fixedly connected to the top of the resistivity imaging measuring instrument. The connecting seat is hollow inside, and an internal thread is formed on the inner wall of the connecting seat.
[0008] As a further optimization of this utility model, a circular hole is provided in the middle section of the mounting plate, and a power line with a spiral structure is passed through the circular hole. One end of the power line is electrically connected to the electrode, and the other end of the power line is electrically connected to the resistivity imaging measuring instrument.
[0009] As a further optimization of this utility model, the mounting plate has a receiving groove for accommodating the power line on the side opposite to the electrode along the length direction of the mounting plate.
[0010] As a further optimization of this utility model, the outer wall of the middle section of the resistivity imaging measuring instrument is provided with a plurality of guide grooves along the length direction of the resistivity imaging measuring instrument, and a guide slider is integrally formed on the inner wall of the slip ring. The end of the guide slider away from the slip ring extends into the guide groove and is slidably connected to the outer wall of the resistivity imaging measuring instrument through the guide groove.
[0011] As a further optimization of this utility model, the first connection structure includes a connecting frame fixedly installed on the end of the mounting plate and the outer wall of the slip ring. The connecting frame has a U-shaped structure, and a pin is fixedly inserted between the two ends of the connecting frame.
[0012] As a further optimization of this utility model, the second connection structure includes a connector fixedly connected to the end of the adjusting plate. A circular hole is provided on the free end of the connector, and the free end of the connector is sleeved on the pin through the circular hole and rotatably connected to the pin.
[0013] As a further optimization of this utility model, the limiting device includes a limiting plate fixedly connected to the slip ring, the slip ring is provided with a bolt threadedly connected to the limiting plate, and one end of the bolt located on the inner side of the limiting plate abuts against the outer wall of the resistivity imaging measuring instrument.
[0014] The beneficial effects of this utility model are as follows:
[0015] 1. When the wellbore diameter is large and there is a gap between the electrode and the well wall when it extends into the wellbore, the user should first loosen the bolts screwed on the phase plate, and then slide the two slip rings in opposite directions along the length of the resistivity imaging measuring instrument. This will cause the two ends of the adjusting plate to rotate around the two pin shafts until the electrode fixed on the mounting plate can fit against the well wall. At this point, the user can tighten the bolts in the opposite direction to carry out the measurement work. This will minimize the problem of the electrode separating from the well wall due to sliding during the measurement process, which would affect the accuracy of the test results.
[0016] 2. Since users can rotate the adjusting plate by sliding the slip ring to adjust the distance between the electrode and the central axis of the resistivity imaging measuring instrument, it is possible to measure wells of different diameters within a certain range, which greatly improves the adaptability of the resistivity imaging device. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the first connection structure of the mounting plate, adjusting plate and slip ring of this utility model;
[0019] Figure 3 This is a schematic diagram of the second connection structure of the mounting plate, adjusting plate and slip ring of this utility model;
[0020] Figure 4 This is a utility model Figure 3 Enlarged view of a close-up detail at point A in the middle;
[0021] Figure 5 This is a utility model Figure 3 Enlarged view of a detail at point B in the middle.
[0022] In the diagram: 1. Resistivity imaging meter; 2. Connecting seat; 3. Mounting plate; 4. Electrode; 5. Power cord; 6. Guide groove; 7. Slip ring; 8. Guide slider; 9. Limiting plate; 10. Bolt; 11. Pin; 12. Connecting frame; 13. Adjusting plate; 14. Connector; 15. Receiving groove. Detailed Implementation
[0023] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0024] Example
[0025] like Figure 1 - Figure 5 As shown, a resistivity imaging device includes a resistivity imaging measuring instrument 1. A connecting seat 2 is fixedly connected to the top of the resistivity imaging measuring instrument 1. The connecting seat 2 is hollow inside and has an internal thread on its inner wall. When installed, the connecting seat 2 can be connected to an external device through the internal thread on the connecting seat 2, and the resistivity imaging measuring instrument 1 can be extended into the wellbore for detection through the external device.
[0026] Multiple mounting plates 3 are arranged in a ring around the middle section of the resistivity imaging measuring instrument 1. Electrodes 4, which are electrically connected to the resistivity imaging measuring instrument 1, are fixedly mounted on each mounting plate 3. A circular hole is opened in the middle section of the mounting plate 3, and a power line 5 with a spiral structure is passed through the circular hole. One end of the power line 5 is electrically connected to the electrode 4, and the other end of the power line 5 is electrically connected to the resistivity imaging measuring instrument 1, so that the resistivity imaging measuring instrument 1 can energize the electrode 4 through the power line 5. The electrode 4 emits current to the bottom of the well wall. Due to the different rock composition, structure and fluid contained in the contact of the electrode 4, the current changes. The change of current reflects the change of rock resistivity at various parts of the well wall. Based on this, the resistivity imaging measuring instrument 1 can display the resistivity image of the well wall.
[0027] The mounting plate 3 has a receiving groove 15 for accommodating the power line 5 along the length of the mounting plate 3 on the side opposite to the electrode 4. When the mounting plate 3 is adjusted to be close to the outer wall of the resistivity imaging measuring instrument 1, the power line 5 can be accommodated in the receiving groove 15 to cover the power line 5 and achieve the purpose of protecting the power line 5.
[0028] Multiple guide grooves 6 are provided on the outer wall of the middle section of the resistivity imaging measuring instrument 1 along the length of the resistivity imaging measuring instrument 1. Two symmetrically arranged slip rings 7 are slidably sleeved on the middle section of the resistivity imaging measuring instrument 1. A guide slider 8 is integrally formed on the inner wall of the slip ring 7. The end of the guide slider 8 away from the slip ring 7 extends into the guide groove 6 and is slidably connected to the outer wall of the resistivity imaging measuring instrument 1 through the guide groove 6. It is used to guide the sliding path of the slip ring 7 through the guide groove 6 and the guide slider 8, so as to avoid the slip ring 7 from rotating relative to the resistivity imaging measuring instrument 1 during the sliding process.
[0029] A first connecting structure is installed on the outer wall of the slip ring 7 and the end of the mounting plate 3. The first connecting structure includes a connecting frame 12 fixedly installed on the end of the mounting plate 3 and the outer wall of the slip ring 7. The connecting frame 12 has a U-shaped structure. A pin 11 is fixedly passed between the two ends of the connecting frame 12. A plurality of adjusting rotating plates 13 are correspondingly provided between the end of the mounting plate 3 and the slip ring 7. A second connecting structure is provided at both ends of the adjusting rotating plate 13. The second connecting structure includes a connector 14 fixedly connected to the end of the adjusting rotating plate 13. A round hole is opened on the free end of the connector 14. The free end of the connector 14 is sleeved on the pin 11 through the round hole and rotatably connected to the pin 11, so that the two ends of the adjusting rotating plate 13 can rotate relative to the end of the slip ring 7 and the end of the mounting plate 3 through the cooperation of the pin 11 and the connector 14.
[0030] The slip ring 7 is also equipped with a limiting device, which includes a limiting plate 9 fixedly connected to the slip ring 7. The slip ring 7 is threaded with a bolt 10 connected to the limiting plate 9. One end of the bolt 10 located inside the limiting plate 9 abuts against the outer wall of the resistivity imaging measuring instrument 1. When it is necessary to adjust the position of the slip ring 7, the bolt 10 can be loosened. At this time, the slip ring 7 can be slid along the length direction of the resistivity imaging measuring instrument 1. After the slip ring 7 is slid to a suitable position, the bolt 10 can be tightened. The slip ring 7 and the resistivity imaging measuring instrument 1 are relatively fixed by the bolt 10 abutting against the outer wall of the resistivity imaging measuring instrument 1.
[0031] It should be noted that in this resistivity imaging device, the electrode 4 is fixedly installed on the mounting plate 3, which is distributed in a ring around the middle section of the resistivity imaging measuring instrument 1, and is electrically connected to the resistivity imaging measuring instrument 1 through a spiral power line 5. When the wellbore diameter is large and there is a gap between the electrode 4 and the well wall when it extends into the wellbore, the user first loosens the bolt 10 screwed on the limiting plate 9, and then slides the two slip rings 7 towards each other along the length direction of the resistivity imaging measuring instrument 1, which drives the two ends of the adjusting plate 13 to rotate around the two pins 11 respectively, until the electrode 4 fixed on the mounting plate 3 can fit against the well wall. At this time, the user can tighten the bolt 10 in the opposite direction so that the two slip rings 7 are fixed relative to the outer wall of the resistivity imaging measuring instrument 1, and the resistivity imaging measuring instrument 1 can be extended into the wellbore for measurement.
[0032] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A resistivity imaging device comprising a resistivity imaging measuring instrument (1), a plurality of mounting plates (3) are annularly distributed on the circumferential side of the middle section of the resistivity imaging measuring instrument (1), and an electrode (4) electrically connected with the resistivity imaging measuring instrument (1) is fixedly installed on each of the plurality of mounting plates (3), characterized in that: Two symmetrical sliding rings (7) are sleeved on the middle section of the resistivity imaging measuring instrument (1), first connecting structures are installed on the outer walls of the sliding rings (7) and the ends of the mounting plates (3), a plurality of adjusting rotating plates (13) are correspondingly arranged between the ends of the mounting plates (3) and the sliding rings (7), second connecting structures are arranged at the two ends of the adjusting rotating plates (13), the two ends of the adjusting rotating plates (13) are rotatably connected with the ends of the mounting plates (3) and the sliding rings (7) through the first connecting structures and the second connecting structures, and a limiting device is further arranged on the sliding rings (7).
2. A resistivity imaging device according to claim 1, characterised in that: The connecting seat (2) is hollow, and an internal thread is formed in the inner wall of the connecting seat (2).
3. A resistivity imaging device according to claim 1, wherein: A circular hole is formed in the middle section of the mounting plate (3), a power line (5) in a spiral structure is arranged in the circular hole, one end of the power line (5) is electrically connected with the electrode (4), and the other end of the power line (5) is electrically connected with the resistivity imaging measuring instrument (1).
4. An electrical resistivity imaging apparatus as claimed in claim 3, wherein: An accommodation groove (15) for accommodating the power line (5) is formed in the length direction of the mounting plate (3) on the side of the mounting plate (3) away from the electrode (4).
5. A resistivity imaging apparatus as claimed in claim 4, characterised in that: A plurality of guide grooves (6) are formed in the length direction of the resistivity imaging measuring instrument (1) on the outer wall of the middle section of the resistivity imaging measuring instrument (1), guide sliding blocks (8) are integrally formed on the inner wall of the sliding ring (7), one end of the guide sliding block (8) away from the sliding ring (7) extends into the guide groove (6) and is slidably connected with the outer wall of the resistivity imaging measuring instrument (1) through the guide groove (6).
6. A resistivity imaging device according to claim 1, characterized in that: The first connecting structure comprises a connecting frame (12) fixedly installed on the end of the mounting plate (3) and the outer wall of the sliding ring (7), the connecting frame (12) is in a U-shaped structure, and a pin shaft (11) is fixedly arranged between the two ends of the connecting frame (12).
7. A resistivity imaging apparatus as claimed in claim 6, characterised in that: The second connecting structure comprises a joint (14) fixedly connected to the end of the adjusting rotating plate (13), a circular hole is formed in the free end of the joint (14), the free end of the joint (14) is sleeved on the pin shaft (11) through the circular hole and is rotatably connected with the pin shaft (11).
8. The resistivity imaging apparatus of claim 1, wherein: The limiting device comprises a limiting plate (9) fixedly connected to the sliding ring (7), a bolt (10) is arranged in the limiting plate (9) and is threadedly connected with the limiting plate (9), and one end of the bolt (10) on the inner side of the limiting plate (9) abuts against the outer wall of the resistivity imaging measuring instrument (1).