CN111364967A - Electric imaging measurement method and electric imaging logging instrument - Google Patents
Electric imaging measurement method and electric imaging logging instrument Download PDFInfo
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- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
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- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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Abstract
The embodiment of the invention discloses an electrical imaging measurement method and an electrical imaging logging instrument; the electrical imaging measurement method comprises the following steps: attaching a plurality of array button electrodes to a well wall to be detected; inputting a current with a preset magnitude to the metal polar plate and each button electrode; keeping the power of the button electrode constant, and adjusting the current of the metal polar plate to ensure that the potential of the metal polar plate is equal to that of the button electrode; measuring the voltage and current of the button electrode; and calculating corresponding impedance information according to the measured voltage and current so as to image the borehole wall. By adopting the scheme of the invention, borehole wall imaging can be carried out in a button electrode constant power mode.
Description
Technical Field
The invention relates to the field of well logging, in particular to an electrical imaging measurement method and an electrical imaging logging instrument.
Background
The development of electrical imaging logging technology was in the 80's of the 20 th century. The first generation of microresistivity scanning imagers were used for imaging in water-based mud wells. The water-based imager, with its high density array of button electrodes, is capable of providing high resolution and high borehole coverage imaging of the borehole wall. The imaging interpretation of the well wall imaging graph reveals new chapters of oil-gas interpretation, and geological information such as lithology, stratum sedimentary structure, crack characteristics and the like can be intuitively acquired from the imaging graph, so that the method is favorable for solving three geological problems faced by the current logging technology: the method comprises the following steps of influence division of a sand shale thin interbed, fracture and storage performance analysis of a fractured reservoir and formation parameter evaluation of a complex lithologic reservoir.
At present, the water-based electrical imaging logging instrument which is mainstream internationally adopts button electrodes to perform array scanning measurement, a great deal of stratum information is acquired along the longitudinal direction, the circumferential direction and the radial direction of a well, the current information acquired by the button electrodes is used for describing the electrical information of the stratum near the well wall, after the electrical information is transmitted to the well, a two-dimensional image of the well wall or a three-dimensional image within a certain detection depth around the well wall is obtained through an image processing technology, and geological analysis and reservoir evaluation are performed by using an imaging graph.
In the instrument working mode, most of the existing electric imaging logging instruments adopt constant voltage to realize the electric information acquisition near the well wall, and when the constant voltage is adopted, the surface potential of a main electrode is constant, and only main current is measured. When the resistivity of the stratum to be measured is lower, the current signal required to be measured is larger, the corresponding measurement error is smaller, the constant pressure type measurement mode is suitable for measurement of low-resistance stratum, and the measurement dynamic range is small. Therefore, in practical application, the measurement method of the electric imaging logging instrument aims at the limitation of measurement in special stratum environments such as high-resistance stratum and the like, and influences the imaging quality.
In view of the above problems in the prior art, it is urgently needed to provide a measurement method to solve the problems of the prior art that the dynamic measurement range is small, and the adaptability in the special formation environment such as a high-resistance formation is low.
Disclosure of Invention
In order to solve the technical problem, the invention provides a constant-power electrical imaging measurement method which can obtain a larger measurement dynamic range.
The invention provides an electrical imaging measurement method, which is applied to an electrical imaging logging instrument, wherein the electrical imaging logging instrument comprises a pushing support arm, a metal polar plate is arranged on the pushing support arm, and a plurality of array button electrodes are arranged on the metal polar plate, and the electrical imaging logging instrument comprises the following components:
attaching a plurality of array button electrodes to a well wall to be detected;
inputting a current with a preset magnitude to the metal polar plate and each button electrode;
keeping the power of the button electrode constant, and adjusting the current of the metal polar plate to ensure that the potential of the metal polar plate is equal to that of the button electrode;
measuring the voltage and current of the button electrode;
and calculating corresponding impedance information according to the measured voltage and current so as to perform borehole wall imaging.
In an exemplary embodiment, each button electrode is separated from the metal plate by an insulating material;
the electric imaging logging instrument further comprises a metal core rod and an insulating short section;
a return electrode is arranged at the upper part of the metal core rod, and the upper part of the metal core rod is connected with the lower part of the metal core rod through the insulating short section; the lower part of the metal core rod is connected with the pushing support arm.
In an exemplary embodiment, the button electrode has a constant power of 1.0W.
In an exemplary embodiment, said maintaining said button electrode power constant and adjusting said metal plate current to equalize said metal plate potential to said button electrode potential comprises:
keeping the power of the button electrode constant, and adjusting the magnitude of the input current of the metal polar plate;
and when the potential of the metal electrode plate is equal to that of the button electrode, determining the input current value of the metal electrode plate, and keeping the input current value.
In an exemplary embodiment, after the current of the preset magnitude is input to the metal plate and each button electrode, the method further includes:
the current flows out from the metal polar plate and the button electrode which are arranged on the pushing support arm and connected with the lower part of the metal core rod, and the current returns to the return electrode on the upper part of the metal core rod through the stratum.
In order to solve the above problems, the present invention also provides an electrical imaging logging tool, comprising: the metal core rod and the pushing support arm;
a return electrode is arranged at the upper part of the metal core rod; the lower part of the metal core rod is connected with the pushing support arm, the metal polar plate is arranged on the pushing support arm, and a plurality of array button electrodes are arranged on the metal polar plate; the array button electrodes are arranged to be attached to a borehole wall to be measured when borehole wall imaging measurement is carried out, and power is kept constant during the measurement period; the metal polar plate is set as the input current when the borehole wall imaging measurement is carried out, and the electric potentials of the metal polar plate and the button electrode are the same by adjusting the current.
In an exemplary embodiment, the electrical imaging tool further comprises: an insulating short section;
and the insulating short joint is used for connecting the upper part of the metal core rod and the lower part of the metal core rod.
In an exemplary embodiment, each button electrode is separated from the metal plate by an insulating material.
In an exemplary embodiment, the button electrode has a constant power of 1.0W.
In an exemplary embodiment, the metal core rod is configured to flow current from the metal plate and button electrodes on the lower portion of the metal core rod when performing borehole wall imaging measurements, the current returning to the return electrode on the upper portion of the metal core rod through the formation.
Compared with the prior art, the invention provides an electrical imaging measurement method, which is applied to an electrical imaging logging instrument and comprises the following steps: attaching a plurality of array button electrodes to a well wall to be detected; inputting a current with a preset magnitude to the metal polar plate and each button electrode; keeping the power of the button electrode constant, and adjusting the current of the metal polar plate to ensure that the potential of the metal polar plate is equal to that of the button electrode; measuring the voltage and current of the button electrode; and calculating corresponding impedance information according to the measured voltage and current so as to perform borehole wall imaging. Through the scheme of the invention, the problem in the prior art is solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a prior art electrical imaging tool;
FIG. 2 is a schematic diagram of a prior art electrical imaging tool metal plate and button electrode configuration;
FIG. 3 is a flowchart of an electrical imaging measurement method according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of the working principle of an electrical imaging logging tool according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for calculating the measured response of button electrode B12 in accordance with one embodiment of the present invention;
FIG. 6 is a schematic diagram of a finite element mesh subdivision in the measurement response calculation of button electrode B12 according to an embodiment of the present invention;
FIG. 7 is a schematic view of a button electrode B12 response to a formation model in accordance with an embodiment of the present invention;
FIG. 8a is a schematic impedance response of button measure electrode B12 according to one embodiment of the present invention;
FIG. 8B is a schematic diagram of the current response of button measure electrode B12 according to one embodiment of the present invention;
FIG. 8c is a schematic diagram of the voltage response of button measure electrode B12 according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 3 is a flowchart of an electrical imaging measurement method according to the present application, which is applied to an electrical imaging logging tool, where the electrical imaging logging tool includes a backup support arm, the metal plate is disposed on the backup support arm, and a plurality of array-type button electrodes are mounted on the metal plate.
The electric imaging logging instrument also comprises a metal core rod and an insulating short section;
a return electrode is arranged at the upper part of the metal core rod, and the upper part of the metal core rod is connected with the lower part of the metal core rod through the insulating short section; the lower part of the metal core rod is connected with the pushing support arm.
As shown in fig. 1, the electrical imaging logging instrument consists of a metal core rod, an insulating short section and a pushing arm; the upper part of the metal core rod is provided with a return electrode, and the upper part of the metal core rod is connected with the lower part of the metal core rod through the insulating short section; the lower part of the metal core rod is connected with a pushing support arm; the metal pole plate is arranged on the pushing support arm, a plurality of measuring electrodes are mounted on the metal pole plate, and the metal pole plate and each measuring electrode are separated through an insulating ring. In the electrical imaging tool, as shown in FIG. 2, the measuring electrode can be provided with 24 button measuring electrodes B1-B24 in two rows, one on top of the other, on the metal plate, and the button electrodes are separated from the metal plate by an insulating material.
As shown in fig. 3, the electrographic measurement method comprises:
and 300, attaching a plurality of array button electrodes to the well wall to be detected.
In this embodiment, when the imaging logging tool is used for performing electrical imaging measurement, the plurality of array button electrodes can be attached to the borehole wall to be measured, so as to perform high-resolution or high-borehole-coverage scanning measurement and other related measurements.
And 301, inputting a current with a preset magnitude to the metal pole plate and each button electrode.
In this embodiment, a low-frequency ac power can be applied to the metal plate and the button electrode at the lower part of the imaging logging tool to generate a potential difference, so as to drive the metal plate and the button electrode to flow out a current with a preset magnitude, such as: the current of the preset magnitude is 1A.
In an exemplary embodiment, after the preset magnitude of current is input to the metal pole plate and each button electrode, the current flows out from the metal pole plate and the button electrode arranged on the lower part of the metal core rod and connected with the pushing support arm, and the current returns to the return electrode on the upper part of the metal core rod through the stratum.
And 302, keeping the power of the button electrode constant, and adjusting the current of the metal polar plate to ensure that the potential of the metal polar plate is equal to that of the button electrode.
In the embodiment, the button electrode power is kept constant, and in the working mode that the button electrode power is constant, the metal plate potential is kept equal to the button electrode potential, and the imaging measurement is carried out under the condition. The button electrode power may be set in advance according to actual conditions, and may be 1W, 10W, or 5W.
In an exemplary embodiment, the button electrode constant power may be 1.0W.
In an exemplary embodiment, said maintaining said button electrode power constant and adjusting said metal plate current to equalize said metal plate potential to said button electrode potential comprises: keeping the power of the button electrode constant, and adjusting the magnitude of the input current of the metal polar plate; and when the potential of the metal electrode plate is equal to that of the button electrode, determining the input current value of the metal electrode plate, and keeping the input current value.
And 303, measuring the voltage and the current of the button electrode.
In this embodiment, the voltage and current of each button electrode were measured separately.
And 304, calculating corresponding impedance information according to the measured voltage and current so as to image the borehole wall.
In this embodiment, according to the button electrode potential and current information measured in step 303, impedance information corresponding to each button electrode can be obtained according to ohm's law, and borehole wall imaging is performed by using the button electrode impedance information.
The present invention also provides an electrical imaging logging tool, as shown in fig. 1, comprising: the metal core rod and the pushing support arm; a return electrode is arranged at the upper part of the metal core rod; the lower part of the metal core rod is connected with the pushing support arm, the metal polar plate is arranged on the pushing support arm, and a plurality of array button electrodes are arranged on the metal polar plate; the array button electrodes are arranged to be attached to a borehole wall to be measured when borehole wall imaging measurement is carried out, and power is kept constant during the measurement period; the metal polar plate is set as the input current when the borehole wall imaging measurement is carried out, and the electric potentials of the metal polar plate and the button electrode are the same by adjusting the current.
In an exemplary embodiment, the electrical imaging tool further comprises: an insulating short section;
and the insulating short joint is used for connecting the upper part of the metal core rod and the lower part of the metal core rod.
In an exemplary embodiment, each button electrode is separated from the metal plate by an insulating material.
In an exemplary embodiment, the button electrode has a constant power of 1.0W.
In an exemplary embodiment, the metal core rod is configured to flow current from the metal plate and button electrode on the lower portion of the metal core rod when performing borehole wall imaging measurements, the current returning to the return electrode on the upper portion of the metal core rod through the formation.
The working principle of the imaging logging instrument is shown in figure 4, when the imaging logging instrument is used for measurement, a low-frequency alternating-current power supply is applied to a lower metal pole plate and a button electrode, the transmitting power of the button electrode is kept constant, the current of the metal pole plate is adjusted, the potential of the metal pole plate is equal to that of the button electrode, a return electrode is arranged on the upper portion of a metal core rod, the current flows out of the button electrode from a lower transmitting area under the driving of potential difference, returns to the return electrode on the upper portion through a stratum, the potential and current information of the button electrode are measured, the impedance information of the button electrode can be obtained through ohm law, and well wall imaging is carried out through.
This is explained below using an example.
This example is applied in an electrical imaging tool as shown in fig. 1. The implementation process of the electrical imaging measurement method is shown by taking any one of a plurality of button measurement electrodes (B12) as an example, and the implementation principle and implementation process of the other button electrodes are the same as those of the B12 electrode, and the embodiment is not limited herein.
The button electrode B12 measured response calculation method is shown in fig. 5.
And step 501, constructing a steady flow field response equation of the electric imaging logging.
According to the potential of a research area, an electric imaging logging instrument and a stratum construction electric imaging logging steady flow field response equation is included:
and (3) expressing the potential of the area to be tested by u (x, y, z), wherein the potential comprises the potential of an electric imaging logging instrument and a stratum, sigma represents the conductivity, under a rectangular coordinate system (x, y, z), the steady-flow field response equation of the electric imaging logging is expressed, and the electric field problem of the electric imaging logging can be described by a differential equation as follows: the potential of the region to be measured is represented by u (x, y, z), the potential comprises the potential of the electric imaging logging instrument and the stratum, sigma represents the conductivity, and under a rectangular coordinate system (x, y, z), a steady-flow field response equation of the electric imaging logging instrument can be described by the following differential equation:
for the above equation 1, corresponding boundary conditions are set, which are part of known quantities and constraints in the equation solving process, and include constant-voltage and constant-current conditions in this embodiment. The specific boundary conditions are as follows:
first type boundary conditions:
firstly, on a constant voltage electrode, for example, on a metal shielding plate of a logging instrument, the voltage values of all nodes are equal, wherein the constant voltage electrode is an equipotential surface; on an infinite boundary, for example, a stratum to be measured, it may be assumed that a range to be measured of the stratum is 10 meters, a voltage of the stratum is a known fixed constant value, and the fixed known constant value is generally set to zero; secondly, on the constant current electrode, u is an unknown constant.
Second type boundary conditions:
on the surface of a constant current electrode
In formula 2, IARepresenting constant electrode current, σmThe conductivity of the slurry is shown, S represents the surface area of the constant current electrode, and n represents the normal direction of the boundary surface; on the insulating boundary surface, there is provided,
the general function constructed from the above solution problem is:
wherein,
Φ2＝-∑IEuEequation 5
Omega is the entire space enclosed by the instrument surface and the infinite boundary, IEDenotes the electrode current uEIndicating the electrode potential.
And 502, setting structural parameters of the instrument and formation model parameters.
In this step, the parameters can be set according to the related parameters of the actually adopted instrument structure of the logging instrument, wherein the related parameters of the structure include the number, the size, the pole plate backflow distance and the like of the button electrodes. As shown in fig. 7, a schematic diagram of a button measure electrode B12 responding to a formation model, taking a calculation button measure electrode B12 as an example, is shown, and the formation model is built, wherein model parameters include: the diameter of a borehole is 8.0 inches, the resistivity of slurry is 0.1 omega.m, the resistivity range of the formation is 0.1-10000.0 omega.m in an infinite-thickness homogeneous formation, and the output power of the button electrode is constant and is 1.0W.
And 503, carrying out finite element numerical value dispersion to form a finite element equation set.
As shown in fig. 6, which is a schematic diagram of finite element mesh division, in the process of solving formula 3, by studying regional mesh division, finite element numerical discretization is realized and a finite element equation set is formed, where the finite element numerical discretization is to discretize a space to be solved to form discrete subspaces, and finally, interpolation is performed in the subspaces.
The tetrahedral mesh subdivision based on the cylindrical coordinate system can be adopted for the three-dimensional solving space, so that various complex conditions of a space area can be subdivided better. Firstly, considering the electric imaging logging instrument and the stratum structure, a concentric circle grid taking a well axis as a center is divided in the radial direction, and the position of a stratum interface is divided in the longitudinal direction according to the structure of the electric imaging logging instrument. The positions of the electric imaging logging instrument, the polar plate, the button electrode, the well hole and the like need to be considered in the radial direction, and the position of the interface of the polar plate and the button electrode of the electric imaging logging instrument needs to be considered in the longitudinal direction, so that the simulation model can be accurately gridded and divided by the gridding method. And finally, dividing the hexahedral unit obtained by the first step again to obtain the tetrahedral unit grid.
In each small tetrahedral unit, the potential u representing a certain position of the investigation region is approximated by an interpolation function:
wherein u isiFor the voltage at the apex of each tetrahedral element, /)iFor the interpolation coefficient corresponding to each vertex, it is used to discretize equation 3, and can obtain:
{u}T{G}{u}＝{u}T{ I } equation 9
Wherein { G } is the total conductance array, interpolation coefficient liComprises the following steps:
in the formula:
Vefor the volume of the tetrahedral element, the calculation formula is as follows:
the two sides of formula 9 are derived from the potential u to obtain a finite element equation set:
{ G } { u } - { I } equation 13
And solving the equation system to obtain the potential u of each point of the research area.
And step 504, setting constraint conditions such as constant power output of the button electrode, equal potential of the metal polar plate and the button electrode and the like.
In this step, in the process of solving formula 3, taking button electrode B12 as an example, a constraint condition is set, that is, button electrode B12 output power is constant, and the power is constant so as to keep the product of button electrode voltage and current as a fixed value:
PB12＝UB12*IB12equation 6
In the formula: pB12Indicating button electrode B12 power, UB12Indicates the button electrode B12 potential, IB12Representing button electrode B12 current.
And 505, solving the equation system to obtain the voltage and current response of the button electrode.
In this step, the button electrode potential response U can be obtained by solving the formula 3 by using a finite element numerical simulation methodB12And current response IB12And the current information can reflect the electrical parameter information of the stratum near the well wall.
And step 506, solving impedance response of the button electrode according to the potential and the current of the button electrode, and performing borehole wall imaging by using the impedance information of the button electrode.
In this step, taking button electrode B12 as an example, button electrode impedance response ZKB12The impedance calculation formula is as follows:
in the formula: ZKB12Representing the button electrode B12 impedance response.
As shown in fig. 8a, 8B and 8c, which are schematic diagrams of impedance response, current response and voltage response of the button measuring electrode B12 corresponding to different formation resistivities, respectively, the mud resistivity is 0.1 Ω · m, the formation resistivity ranges from 0.1 to 10000.0 Ω · m, the contrast ratio of the resistivity of the formation and the mud is 1-100000, taking the button electrode to keep constant power output of 1W as an example, the impedance response range of the button electrode B12 is 527.75-5.87 e8 omega, the corresponding voltage response range is 22.97-24222.95V, the current response range is 0.0435-4.13 e-5A, and the calculation result shows that the impedance response dynamic range is 1.1123e6, the voltage response dynamic range is 1.0545e3, the current response dynamic range is 1.0533e3, the dynamic range represents the ratio of the maximum value to the minimum value of the response, the voltage and current response dynamic ranges are almost consistent, and the impedance response dynamic range is 1000 times of the voltage and current response dynamic range. Therefore, the simulation test results show that the button electrode adopts a constant-power measurement mode, a large button impedance response range can be obtained in a small voltage dynamic direction and a small current dynamic range, the measurement dynamic range and the measurement precision of the button electrode are improved, and the high-precision signal acquisition of the electrical imaging logging instrument in the measurement environments of high-contrast stratum, high-resistivity stratum and the like is realized.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. An electrical imaging measurement method is applied to an electrical imaging logging instrument, the electrical imaging logging instrument comprises a pushing support arm, a metal polar plate is arranged on the pushing support arm, and a plurality of array button electrodes are arranged on the metal polar plate, and the electrical imaging logging instrument is characterized by comprising the following steps:
attaching a plurality of array button electrodes to a well wall to be detected;
inputting a current with a preset magnitude to the metal polar plate and each button electrode;
keeping the power of the button electrode constant, and adjusting the current of the metal polar plate to ensure that the potential of the metal polar plate is equal to that of the button electrode;
measuring the voltage and current of the button electrode;
and calculating corresponding impedance information according to the measured voltage and current so as to perform borehole wall imaging.
2. The electrical imaging measurement method of claim 1,
each button electrode is separated from the metal polar plate by an insulating material;
the electric imaging logging instrument further comprises a metal core rod and an insulating short section;
a return electrode is arranged at the upper part of the metal core rod, and the upper part of the metal core rod is connected with the lower part of the metal core rod through the insulating short section; the lower part of the metal core rod is connected with the pushing support arm.
3. The method of claim 1 wherein said button electrode is of constant power of 1.0W.
4. The method of claim 1, wherein said maintaining said button electrode power constant and adjusting said metal plate current to equalize said metal plate potential to said button electrode potential comprises:
keeping the power of the button electrode constant, and adjusting the magnitude of the input current of the metal polar plate;
and when the potential of the metal electrode plate is equal to that of the button electrode, determining the input current value of the metal electrode plate, and keeping the input current value.
5. The electrical imaging measurement method of claim 2, wherein the step of inputting a preset amount of current to the metal plate and each button electrode further comprises:
the current flows out from the metal polar plate and the button electrode which are arranged on the pushing support arm and connected with the lower part of the metal core rod, and the current returns to the return electrode on the upper part of the metal core rod through the stratum.
6. An electrical imaging logging tool, comprising: the metal core rod and the pushing support arm;
a return electrode is arranged at the upper part of the metal core rod; the lower part of the metal core rod is connected with the pushing support arm, the metal polar plate is arranged on the pushing support arm, and a plurality of array button electrodes are arranged on the metal polar plate; the array button electrodes are arranged to be attached to a borehole wall to be measured when borehole wall imaging measurement is carried out, and power is kept constant during the measurement period; the metal polar plate is set as the input current when the borehole wall imaging measurement is carried out, and the electric potentials of the metal polar plate and the button electrode are the same by adjusting the current.
7. The electrical imaging tool of claim 6, further comprising: an insulating short section;
and the insulating short joint is used for connecting the upper part of the metal core rod and the lower part of the metal core rod.
8. The electrical imaging tool of claim 6, wherein each button electrode is separated from the metal plate by an insulating material.
9. The electrical imaging tool of claim 6 wherein the button electrode constant power is 1.0W.
10. The electrical imaging tool of claim 6, wherein the metal core rod is configured to draw current from a metal plate and button electrode on a lower portion of the metal core rod when performing borehole wall imaging measurements, the current returning to the return electrode on an upper portion of the metal core rod through the formation.
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