CN210888912U - Eccentric wall-attached electrode in well - Google Patents
Eccentric wall-attached electrode in well Download PDFInfo
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- CN210888912U CN210888912U CN201922022960.9U CN201922022960U CN210888912U CN 210888912 U CN210888912 U CN 210888912U CN 201922022960 U CN201922022960 U CN 201922022960U CN 210888912 U CN210888912 U CN 210888912U
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Abstract
The utility model provides an eccentric adherence electrode in well, the electrode includes: the vertical weight bar, the electrode column, the hook, the m.n insulation tow groups and the p.q mixed conductive tow groups; the top end of the electrode column is provided with a round hole for penetrating through the insulated armored cable; the hook is arranged at the bottom end of the electrode column at a set distance from the central point and is used for being hung in the circular hole of the vertical bar through an insulating rope; m layers are arranged between the first distance and the second distance, each layer is provided with n first matrix holes, and the first matrix holes are used for penetrating through the insulation tow groups; p layers are arranged between the third distance and the fourth distance, and each layer is provided with q second matrix holes which are used for penetrating through the mixed conductive tow groups. The utility model discloses a technical scheme can charge and can survey the seam thickness again, still ensures that the electrode can effectively contact with the pore wall all the time, prevents that the downthehole falling rocks of small-diameter block electrode etc..
Description
Technical Field
The utility model relates to a metal mine geophysical exploration technical field especially relates to an eccentric adherence electrode in well.
Background
The national metal mineral resources such as gold, silver, copper, lead and zinc ores are not guaranteed sufficiently, the external dependence is large, and the national high importance is placed on the technical research of metal mineral resource exploration and ore finding methods. The metal deposit types are many, the thickness of the ore body changes greatly, and the ore body has a huge thick ore deposit with the thickness of more than one hundred meters and also has a thin ore deposit with the thickness of less than 5 meters. Many metal ore bodies are produced in a layered or vein shape, the ore layer is thin, the metal ore value is high, the thickness of the mineable layer is small, and the mineable layer is 1m in the general industrial index of gold, silver, copper, lead and zinc ores. And the drilling verification is easy to leak ores. The conditions of leaking ore layers and insufficient mining heart rate frequently occur, the position of the drilled leaking ore layers needs to be searched by a geophysical prospecting well logging method, the thickness of the ore layers is determined, the attitude of the ore layers is judged, and even blind ore bodies around wells and at the bottoms of the wells need to be searched. The application of in-well charging methods, charging logging methods, mobile charging current measurement methods and the like requires the use of in-well charging electrodes.
At present, the charging method in the well mainly tracks the spatial distribution condition of blind ore bodies, does not search the tasks of drilling and drilling a leaked ore layer and detecting the thickness of the ore layer, and has no special requirement on the manufacture of a charging electrode, so that the charging electrode and the manufacturing method are not recorded in the related standard well.
In addition, the in-well charging method usually uses a copper bar with the length of about 1m to replace an electrode (called a tubular metal electrode), and the electrode is difficult to cling to the hole wall and has poor power supply effect; or a copper bar and a penetrating steel wire are used as electrodes (called brush electrodes), although the copper bar and the penetrating steel wire can be tightly attached to the hole wall, the power supply effect is good, but the copper bar and the penetrating steel wire are inconvenient to move up and down and are easy to clamp in a drill hole. Furthermore, neither tubular metal electrodes nor brush electrodes take into account the need to detect the thickness of the seam.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an off-centre adherence electrode in well.
In order to achieve the above object, the utility model provides an eccentric adherence electrode in well, the electrode includes:
the device comprises a vertical weight bar, an electrode column, a hook, m.n insulating tow groups and p.q mixed conducting tow groups, wherein m, n, p and q are positive integers more than 1;
the top end of the electrode column is provided with a round hole for penetrating through the insulated armored cable; the hook is arranged at the bottom end of the electrode column at a set distance from the central point and is used for being hung in the circular hole of the vertical bar through an insulating rope; setting a first distance from the top end of the electrode column, setting a second distance from the top end of the electrode column, wherein m layers are arranged between the first distance and the second distance, each layer is provided with n first matrix holes, and the first matrix holes are used for penetrating through the insulating tow group; and setting a third distance from the bottom end of the electrode column, setting a fourth distance from the bottom end of the electrode column, wherein p layers are arranged between the third distance and the fourth distance, and each layer is provided with q second matrix holes which are used for penetrating through the mixed conductive tow group.
Optionally, the number of the first matrix holes is the same as the number of the second matrix holes, and the number of the first matrix holes arranged in each layer is the same as the number of the second matrix holes arranged in each layer.
Optionally, a distance between two adjacent layers of the first matrix holes is a fifth distance, a distance between two adjacent layers of the second matrix holes is a sixth distance, and the fifth distance is equal to the sixth distance.
Optionally, the length of the insulating tow group is the same as the length of the mixed conductive tow group, and the diameter of the insulating tow group is equal to the diameter of the mixed conductive tow group.
Optionally, the mixed conductive tow group includes: 3 first copper wires of setting for length, 4 first steel wires of setting for length, 3 copper wires of setting for length of second, 3 steel wires of setting for length of second, 3 copper wires of setting for length of third and 3 steel wires of setting for length of third.
Optionally, the insulation tow group includes: c nylon wires with a third set length, wherein the diameter of the insulation silk bundle group formed by the c nylon wires is equal to that of the first matrix hole, and c is a positive integer larger than 1.
Optionally, the electrode column is a rod-shaped rigid material.
Optionally, k threaded holes are arranged at a set distance from the bottom end of the electrode column to the central point, wherein k is a positive integer greater than 1; the threaded hole is used for placing a hook.
Optionally, an included angle formed by two adjacent threaded holes from the central position is
Optionally, the diameter of the nylon wire, the diameter of the copper wire and the diameter of the steel wire are all 1 mm.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides an eccentric adherence electrode in well, the electrode includes: the vertical weight bar, the electrode column, the hook, the m.n insulation tow groups and the p.q mixed conductive tow groups; the top end of the electrode column is provided with a round hole for penetrating through the insulated armored cable; the hook is arranged at the bottom end of the electrode column at a set distance from the central point and is used for being hung in the circular hole of the vertical bar through an insulating rope; m layers are arranged between the first distance and the second distance, each layer is provided with n first matrix holes, and the first matrix holes are used for penetrating through the insulation tow groups; p layers are arranged between the third distance and the fourth distance, and each layer is provided with q second matrix holes which are used for penetrating through the mixed conductive tow groups. The utility model discloses a technical scheme can charge and can survey the seam thickness again, still ensures that the electrode can effectively contact with the pore wall all the time, prevents that the downthehole falling rocks of small-diameter block electrode etc..
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of an off-center wall-attached electrode in a well according to an embodiment of the present invention;
fig. 2 is a front view of an eccentric wall-attached electrode in a well designed by taking a 76mm diamond bit as an example according to an embodiment of the present invention;
FIG. 3 is a distribution diagram of the brush holes on the surface of the wall-attached electrode according to the embodiment of the present invention;
fig. 4 is a bottom end view of an adherent electrode according to an embodiment of the present invention;
FIG. 5 is a chart comparing the ZK2002 hole charging logging method and resistivity logging effect in a certain exploration area according to the embodiment of the present invention;
the cable comprises a vertical weight rod 1, an electrode column 2, a hook 3, an insulating tow group 4, a mixed conducting tow group 5, an insulating rope 6, a central point 7, a set distance 8 and an insulating armored cable 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, all belong to the protection scope of the present invention.
The utility model aims at providing an off-centre adherence electrode in well.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The prior electrode has to face two problems during the manufacturing, one is that the electrode must always contact with the hole wall during the charging in the well, and the electrode cannot have obvious resistance during the movement in the hole; and secondly, the device can supply power with large current on the wall and meet the requirement of detecting the thickness of the thin-layer ore body. To address the above issues, the present application discloses an off-center wall-attached electrode in a well, as shown in fig. 1, the electrode comprising:
the vertical weight rod 1, the electrode column 2, the hook 3, m.n insulating tow groups 4 and p.q mixed conducting tow groups 5, wherein m, n, p and q are positive integers more than 1;
a round hole is formed in the top end of the electrode column 2 and used for penetrating through the insulated armored cable 9; the hook 3 is arranged at the bottom end of the electrode column 2 and a set distance 8 from a central point 7, and is hung in a circular hole of the vertical bar 1 through an insulating rope 6; setting a first distance from the top end of the electrode column 2, setting a second distance from the top end of the electrode column 2, wherein m layers are arranged between the first distance and the second distance, each layer is provided with n first matrix holes, and the first matrix holes are used for penetrating through the insulation tow group 4; and a third distance is set from the bottom end of the electrode column 2, a fourth distance is set from the bottom end of the electrode column 2, p layers are arranged between the third distance and the fourth distance, q second matrix holes are formed in each layer, and the second matrix holes are used for penetrating through the mixed conductive tow group 5.
As an embodiment, the number of piles of first matrix hole with the number of piles of second matrix hole is the same, and every layer sets up the number of first matrix hole is with setting up the number of second matrix hole is the same, and m is equal to p, and n is equal to q, adjacent two in each layer first matrix hole with arc length between the second matrix hole is greater than and sets for length, adjacent two in each layer arc length between the second matrix hole is greater than and sets for length, it is 2cm to set for length.
As an embodiment, the distance between two adjacent layers of the first matrix holes is a fifth distance, the distance between two adjacent layers of the second matrix holes is a sixth distance, the fifth distance is equal to the sixth distance, wherein,
as an embodiment, the length of the insulating tow group 4 is the same as the length of the mixed conductive tow group 5, and the diameter of the insulating tow group 4 is equal to the diameter of the mixed conductive tow group 5.
As an embodiment, the mixed conductive tow group 5 of the present invention includes: 3 copper wires with a first set length, 4 steel wires with a first set length, 3 copper wires with a second set length, 3 steel wires with a second set length, 3 copper wires with a third set length and 3 steel wires with a third set length; the first set length is 0.7cm, the second set length is 1.2cm, and the third set length is 1.7 cm.
As an embodiment, the insulation tow group 4 of the present invention includes: c nylon wires with a third set length, wherein the diameter of the insulating tow group 4 formed by the c nylon wires is equal to that of the first matrix hole, and c is a positive integer greater than 1; the diameter of the nylon yarn is 1 mm.
As an embodiment, the electrode column 2 of the present invention is a rod-shaped rigid material, specifically a copper rod.
As an implementation mode, the top end of the electrode column 2 of the present invention is a cambered surface, the bottom end of the electrode column 2 is a plane, k threaded holes are arranged at a set distance of 8 from the bottom end of the electrode column 2 to a central point 7, wherein k is a positive integer greater than 1; the threaded hole is used for placing a hook 3; the included angle formed from the adjacent two threaded holes to the central position is
As an implementation mode, the utility model discloses all spray insulating paint on the surface of electrode post 2 and the surface of heavy stick 1 hangs down.
Specific examples are:
the diameter of the eccentrically attached electrodes in the well is related to the bore hole diameter. The diameter of the electrode column 2, the length of the group of hybrid conductive tows 5 and the length of the group of insulating tows 4 can be designed according to the above-mentioned principles. To better illustrate the above embodiments, the present invention takes the metal ore drilling small-bore diamond bit as an example for analysis, the bore diameter of the small-bore diamond bit is generally 76-80mm, as shown in fig. 2, the electrode column 2 is a copper rod, the diameter of the electrode column 2 is 4cm, the circumference of the electrode column is 12.56cm, the length of the electrode column 2 is 110cm, and the weight of the electrode column is about 12.3 kg. The top end of the electrode column 2 is processed into an arc surface, the distance between the top ends of the electrode column 2 is 5cm, namely the first distance is 5cm, and a round hole with the diameter of 1cm is formed in the center of the top end of the electrode column 2 and used for penetrating through the insulated armored cable 9.
As shown in fig. 3, 11 layers are disposed between the third distance 5cm and the fourth distance 15cm of the electrode column 2, the arc length between two adjacent first matrix holes and two adjacent second matrix holes in each layer is 2.1cm, the arc length between two adjacent second matrix holes in each layer is 2.1cm, the distance between two adjacent layers is 1cm, each layer is provided with 6 second matrix holes, an included angle formed by two adjacent second matrix holes to the center position of each layer is 60 °, and 66 second matrix holes are totally disposed, and the second matrix holes are used for penetrating through the mixed conductive tow group 5; the mixed conductive wire bundle group 5 comprises 19 steel-copper mixed wire bundles, 3 copper wires of 0.7cm, 4 steel wires of 0.7cm, 3 copper wires of 1.2cm, 3 steel wires of 1.2cm, 3 copper wires of 1.7cm and 3 steel wires of 1.7cm, wherein the diameters of the copper wires and the copper wires are both 1 mm.
11 layers are arranged between the first distance 5cm and the second distance 15cm of the electrode column 2, the distance between two adjacent layers is 1cm, each layer is provided with 6 first matrix holes, and the total number of the first matrix holes is 66, and the first matrix holes are used for penetrating through the insulation tow group 4; the arrangement mode of the first matrix holes is the same as that of the second matrix holes, and the description is omitted here; the insulating tow group 4 includes: 19 nylon wires with the diameter of 1mm and the length of 1.7cm are firmly installed and play the roles of insulation and righting.
As shown in FIG. 4, the bottom end of the electrode column 2 is a plane, and the bottom is 5cm long. And 6 threaded holes are formed in the position, which is 81.25cm away from the central point 7, of the bottom end of the electrode column 2, the diameter of each threaded hole is 5mm, and when the electrode column is used for logging, a screw hook 3 is installed in one threaded hole every time for hanging the vertical rod 1.
The bottom end of the electrode column 2 is hung in a circular hole of the vertical weight rod 1 through an insulating rope 6, the vertical weight rod 1 is made of a copper rod, the vertical weight rod 1 is 4cm in diameter and 100cm long and weighs about 11.2kg, the upper end of the vertical weight rod 1 is an arc surface, the lower end of the vertical weight rod 1 is a plane, attractiveness is achieved, resistance is reduced, a circular hole with the diameter of 1cm is formed in the upper end of the vertical weight rod 1 and is used for tying the insulating rope 6, when the effective length of the insulating rope 6 is 100 cm. well logging, the vertical weight rod 1 is hung on a hook 3 at the bottom of the electrode column 2 through the insulating rope 6 with the diameter of 100cm, when the hook 3 deviates from a central point of 71.25cm, the lateral pressure provided by the vertical weight rod 1 is approximately 11.2kg × 1.25.25% -0. 0.14 kg., and not only can be guaranteed that a brush electrode can be always effectively contacted with a hole wall, but.
Application test
The eccentric adherent electrode in the well is subjected to an application test in a certain gold ore integral investigation area by ZK 2002.
Fig. 5 is a graph comparing the charging logging method for the ZK2002 holes and the resistivity logging effect in a certain exploration area according to an embodiment of the present invention, wherein (a) in fig. 5 is the logging data determined by the charging logging method, and (b) in fig. 5 is the logging data determined by the resistivity method, as shown in (a) and (b) in fig. 5, ZK2002, the bore diameter of the drilling construction is 76mm, and the hole depth is 650.15 m. 0-98.65 m is the fourth system, the resistivity is 20-50 omega.m, the bedrock is below 98.65 m to the bottom of the hole, the main lithology is the metamorphic rock of the former frigid system, and the resistivity is 2000-6000 omega.m. A gold-containing mineralized altered rock stratum with the thickness of 10.77m, the resistivity of 10-50 omega-m and good conductivity is arranged at the position of the hole depth of 378.18-388.95 m.
The charge logging method application test is carried out between the hole depth of 360-500m, and the eccentric adherence electrode in the well is used for supplying power. In order to compare the test effect, the resistivity logging method is also carried out.
The charging logging method is used for testing, the power supply electrodes are respectively arranged at an infinite position (a pole) and a well (an pole A), the pole A is moved and charged in the well, the potential change condition is simultaneously observed in four directions of the earth surface, and the eccentric wall-attached electrodes in the well can be used for simultaneously finding a drilled and leaked ore layer, detecting the thickness of the ore layer and judging the occurrence of the ore layer. Resistivity logging is a well-established method of finding a drilled and drilled out formation using an instrumentation plant electrode probe.
The test result of the charging logging method shows that the charging logging method has an obvious potential rise abnormality at a hole depth of 378-.
The utility model discloses an electrode can be downthehole smooth and easy removal and charge, and the electrode diameter both need be less than the drill bit bore, can contact with the pore wall again, for this reason the electrode form design is the clavate, uses the bar copper as electrode post 2, at bar copper electrode post 2 the third distance with implant mixed conductive tow group 5 between the fourth distance, make electrically conductive brush to hang heavy stick 1 at the skew central point 7 in electrode below, force electrode deviation wall of a well one side and contact with it, and can keep having pressure to the pore wall, reach the adherence effect.
The utility model discloses a survey thin layer ore body thickness, design short contact surface electrode, will on bar copper electrode post 2 the third distance with distance (electrically conductive brush face length promptly) design is 0.1m between the fourth distance, and survey ore bed thickness resolution can reach 0.2 m.
The utility model discloses incite somebody to action mix conductive tow group 5 and set 3 first copper wires of setting for length to, 4 first steel wires of setting for length, 3 copper wires of setting for length of second, 3 steel wires of setting for length of second, 3 copper wires of setting for length of third, 3 steel wires of setting for length of third, the diameter of copper wire and copper wire is 1mm, fixes with the soldering tin in the second matrix hole, the realization utilizes the conductive brush hair of the mixed tow preparation of steel copper, and existing elasticity has good electric conductivity again, be convenient for with pore wall contact electric conduction and slide in the hole.
The utility model discloses in the above concrete example, first matrix hole with the number of piles in second matrix hole all is relevant with the drilling aperture, and is adjacent two-layer distance between the second matrix hole sets up to 1cm, sets up 11 layers altogether. Due to the eccentric vertical weight adherence design, at least 132 long steel copper wires of 22 bundles of 2 rows of bristles can be ensured to be contacted with the hole wall, and the total cross section of 103.6 square millimeters can completely meet the current requirement of more than 20A; first matrix hole with second matrix hole is the vertical arrangement sparse distribution design, adjacent two in each layer promptly first matrix hole with arc length between the second matrix hole is greater than 2cm, adjacent two in each layer arc length between the second matrix hole is greater than 2cm, remain the clearance 2cm at least between the surface of electrode post 2 and the pore wall, the resistance is little when the downthehole motion of brush electrode, and the downthehole falling stone of small-diameter also can not block.
The utility model has the advantages that the total weight of the electrode design exceeds 20kg, the downward tension is provided, and the cable in the hole can be kept straight; the electrode is made of a rod-shaped rigid material and has guidance performance; the insulating tow group 4 installed at the upper end of the electrode column 2 and the mixed conductive tow group 5 have the same specification and size, and the diameters of the upper end and the lower end of the electrode column 2 are kept the same, so that the electrode column 2 can play a role of righting, the electrode column 2 can not be contacted with the hole wall to cause electric leakage, the electrode can be basically parallel to the hole wall under the condition of inclined drilling, and the eccentric weight adherence design can continuously play a role.
To sum up, the utility model has the advantages of it is following:
1. the eccentric vertical weight adherence design ensures that the electrode can always effectively contact with the hole wall;
2. the design of a short contact surface can not only charge but also detect the thickness of a mineral seam;
3. the mixed steel copper wire bundles with different lengths are designed, so that the mixed steel copper wire bundles can be conveniently contacted with the hole wall for conducting electricity and can slide in the hole;
4. the brush holes are vertically arranged and sparsely distributed, namely the arc length between two adjacent first matrix holes and two adjacent second matrix holes in each layer is greater than 2cm, the arc length between two adjacent second matrix holes in each layer is greater than 2cm, and the gap between the surface of the electrode column 2 and the hole wall is at least 2cm, so that the electrodes are prevented from being stuck by falling rocks in the holes with small particle sizes;
5. the design of straightening and righting can prevent the contact leakage of the copper bar electrode column 2 and the hole wall and ensure that the electrode can also play a normal role under the condition of inclined drilling;
6. the wall-attached electrode is designed totally, and the blank of the high-resolution eccentric wall-attached charging electrode is filled.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. An eccentrically attached wall electrode in a well, the electrode comprising:
the device comprises a vertical weight bar, an electrode column, a hook, m.n insulating tow groups and p.q mixed conducting tow groups, wherein m, n, p and q are positive integers more than 1;
the top end of the electrode column is provided with a round hole for penetrating through the insulated armored cable; the hook is arranged at the bottom end of the electrode column at a set distance from the central point and is used for being hung in the circular hole of the vertical bar through an insulating rope; setting a first distance from the top end of the electrode column, setting a second distance from the top end of the electrode column, wherein m layers are arranged between the first distance and the second distance, each layer is provided with n first matrix holes, and the first matrix holes are used for penetrating through the insulating tow group; and setting a third distance from the bottom end of the electrode column, setting a fourth distance from the bottom end of the electrode column, wherein p layers are arranged between the third distance and the fourth distance, and each layer is provided with q second matrix holes which are used for penetrating through the mixed conductive tow group.
2. The off-center in-well adherent electrode of claim 1, wherein the number of layers of the first matrix holes is the same as the number of layers of the second matrix holes, and wherein the number of the first matrix holes per layer is the same as the number of the second matrix holes per layer.
3. The eccentrically attached well electrode of claim 2, wherein the distance between two adjacent layers of the first matrix holes is a fifth distance and the distance between two adjacent layers of the second matrix holes is a sixth distance, and wherein the fifth distance is equal to the sixth distance.
4. The eccentrically attached wall electrode in a well of claim 2, wherein the length of the set of insulating tows is the same as the length of the set of mixed conducting tows, and the diameter of the set of insulating tows is the same as the diameter of the set of mixed conducting tows.
5. The eccentrically attached well electrode of claim 1, wherein the set of mixed conducting tows comprises: 3 first copper wires of setting for length, 4 first steel wires of setting for length, 3 copper wires of setting for length of second, 3 steel wires of setting for length of second, 3 copper wires of setting for length of third and 3 steel wires of setting for length of third.
6. The eccentrically attached electrode in a well of claim 5, wherein the set of insulating tows comprises: c nylon wires with a third set length, wherein the diameter of the insulation silk bundle group formed by the c nylon wires is equal to that of the first matrix hole, and c is a positive integer larger than 1.
7. The eccentrically attached electrode in a well of claim 1, wherein the electrode column is a rod-shaped rigid material.
8. The off-center wall-attached electrode in a well according to claim 1, wherein k threaded holes are provided at a set distance from the bottom end of the electrode column to the center point, wherein k is a positive integer greater than 1; the threaded hole is used for placing a hook.
9. The eccentrically attached wall electrode in a well according to claim 8, wherein the angle formed by the adjacent two threaded holes to the central position is
10. The off-center wall electrode in a well of claim 6, wherein the diameter of the nylon wire, the diameter of the copper wire and the diameter of the steel wire are all 1 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994775A (en) * | 2022-08-08 | 2022-09-02 | 山东大学 | Double-line detection device, system and array acquisition method for cross-well induced polarization measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994775A (en) * | 2022-08-08 | 2022-09-02 | 山东大学 | Double-line detection device, system and array acquisition method for cross-well induced polarization measurement |
| CN114994775B (en) * | 2022-08-08 | 2022-11-15 | 山东大学 | Double-line detection device, system and array acquisition method for cross-well induced polarization measurement |
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