CN112287570B - Cased well channel electromagnetic simulation analysis method and device and readable storage medium - Google Patents
Cased well channel electromagnetic simulation analysis method and device and readable storage medium Download PDFInfo
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Abstract
The invention discloses a cased well channel electromagnetic simulation analysis method, a cased well channel electromagnetic simulation analysis device and a readable storage medium. Wherein the method when executed comprises the steps of: dividing cased well channels with mismatched aspect ratios into a near field model and a far field model based on signal transmission characteristics; establishing excitation and load relations of a near field model and a far field model based on the road characteristics; carrying out simulation analysis on the near-field model based on the excitation and load relation to obtain an equivalent excitation source of the near-field model, and the equivalent internal resistance and voltage ratio of the equivalent excitation source; carrying out simulation analysis on the far-field model based on the excitation and load relation to obtain the equivalent load and the signal attenuation ratio of the far-field model; based on excitation and load relation analysis, equivalent internal resistance and the voltage division ratio of the equivalent load; and acquiring the signal attenuation relation of the cased well channel based on the excitation and load relation, the voltage ratio, the signal attenuation ratio and the voltage division ratio. The invention realizes the simulation analysis of the channel with the misadjusted aspect ratio and can more accurately reflect the actual electromagnetic signal transmission rule.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a cased well channel electromagnetic simulation analysis method and device and a readable storage medium.
Background
In the traditional engineering, the sensing data monitored under the oil well is remotely and wired transmitted through a cable, so that the cost is high, the operation is complicated, and the real-time performance is not realized.
The current mainstream direction of the related art is the engineering exploration based on wireless transmission. The wireless signals mainly comprise three signals of mud pulse, electromagnetic wave and sound wave, the transmission rate of the electromagnetic wave is high, the wireless signals are not influenced by a mud medium, and the development prospect is wide.
The transmission of electromagnetic signals in cased hole channels has wider application occasions compared with open holes, but the difficulty is promoted for the research of signal transmission due to the complex pipeline structure and the leakage current influence of interpipe bottom liquid, so that the transmission rule of electromagnetic signals along cased hole communication channels formed by structures such as mineshafts, oil pipes, soil layers and the like is more challenging and significant.
Disclosure of Invention
The embodiment of the invention at least discloses a cased well channel electromagnetic simulation analysis method. In the embodiment, the simulation analysis of the channel with the maladjustment aspect ratio is realized by using the thought of field integration; in addition, the far-field simulation and the near-field simulation are simplified, and the finite element calculation amount is effectively reduced in simulation analysis; meanwhile, the electromagnetic signal transmission rule in practice can be reflected more accurately.
Specifically, the method comprises the following steps when executed: dividing cased well channels with mismatched aspect ratios into a near field model and a far field model based on signal transmission characteristics; establishing excitation and load relations of the near field model and the far field model based on the road characteristics; carrying out simulation analysis on the near field model based on the excitation and load relation to obtain an equivalent excitation source of the near field model and the equivalent internal resistance and voltage ratio of the equivalent excitation source; carrying out simulation analysis on the far-field model based on the excitation and load relation to obtain the equivalent load and the signal attenuation ratio of the far-field model; based on the excitation and load relation analysis, the equivalent internal resistance and the voltage division ratio of the equivalent load; and acquiring a signal attenuation relation of the cased hole channel based on the excitation and load relation, the voltage ratio, the signal attenuation ratio and the voltage division ratio.
The embodiment of the invention discloses at least one computer readable storage medium. The readable storage medium has stored thereon a computer program for executing the cased hole channel electromagnetic simulation analysis method.
The embodiment of the invention at least discloses a cased well channel electromagnetic simulation analysis device.
The device comprises a model configuration module, a relation configuration module, a near-field model analysis module, a far-field model analysis module and an equivalent processing module; the model configuration module divides cased well channels with misadjusted aspect ratios into a near field model and a far field model based on signal transmission characteristics; the relationship configuration module establishes excitation and load relationships of the near field model and the far field model based on path characteristics; the near-field model analysis module simulates and analyzes the near-field model based on the excitation and load relation to obtain an equivalent excitation source of the near-field model and the equivalent internal resistance and voltage ratio of the equivalent excitation source; the far-field model analysis module simulates and analyzes the far-field model based on the excitation and load relation to obtain the equivalent load and the signal attenuation ratio of the far-field model; the equivalent processing module obtains a signal attenuation relation of the cased well channel based on the excitation and load relation analysis, the equivalent internal resistance and the voltage division ratio of the equivalent load, and the excitation and load relation, the voltage ratio, the signal attenuation ratio and the voltage division ratio.
In view of the above, other features and advantages of the disclosed exemplary embodiments will become apparent from the following detailed description of the disclosed exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram of a cased hole channel according to an embodiment;
FIG. 2 is a flow chart of a simulation analysis method in an embodiment;
FIG. 3 is an equivalent circuit diagram of a cased hole channel based on path characteristics;
FIG. 4 is a flowchart of an embodiment simulation analysis method S300;
FIG. 5 is a flow chart of an embodiment simulation analysis method S400;
FIG. 6 is a diagram illustrating a 1/4 structure of a near-field model in the three-dimensional analysis of an embodiment;
FIG. 7 is a cross-sectional view of 1/4 near-field model during three-dimensional analysis in the example;
FIG. 8 is a partial longitudinal sectional view of 1/2 far field model for two-dimensional analysis in an embodiment;
FIG. 9 is a block diagram of a simulation analysis apparatus according to an embodiment.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of various described embodiments. It will be apparent, however, to one skilled in the art that the various described embodiments may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail as not to unnecessarily obscure aspects of the embodiments.
It will also be understood that, although the terms first, second, etc. may be used herein to describe various elements in some cases, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first contact can be termed a second contact, and, similarly, a second contact can be termed a first contact, without departing from the scope of the various described embodiments. The first contact and the second contact are both contacts, but they are not the same contact.
The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used herein, the term "if" is optionally to be interpreted to mean "when … …" ("where" or "upon") or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined … …" or "if [ stated condition or event ] is detected" is optionally to be construed to mean "upon determination … …" or "in response to determination … …" or "upon detection of [ stated condition or event ] or" in response to detection of [ stated condition or event ] ", depending on the context.
The embodiment discloses a cased well channel electromagnetic simulation analysis method. The equipment forming the cased hole channel in this embodiment comprises a downhole transmitter 1, two centralizers 2, an oil pipe 3, a casing 4, a surface receiver 7 and a bottom fluid 5.
Referring to fig. 1, the cased well in the present embodiment is a double-layer coaxial tubular structure, and specifically, is composed of a casing 4 and an oil pipe 3. The casing 4 is installed below the soil layer in a drilling mode, the oil pipe 3 is in clearance fit in the casing 4, and bottom liquid 5 is filled between the oil pipe 3 and the casing 4. The underground launcher 1 is arranged on the surface of an oil pipe 3, and the two centralizers 2 are respectively arranged between the oil pipe 3 and the casing 4 and are respectively arranged at the upper end and the lower end of the underground launcher 1; the surface receiver 7 is deployed at the surface. Meanwhile, the longitudinal length of the cased well with the disordered aspect ratio is generally 1 km-4 km, and the transverse length is generally 0.15 m-0.2 m.
Then, in the present embodiment, the downhole transmitter 1 can generate an electromagnetic signal, and the electromagnetic signal carries out short-distance backflow through the short-distance backflow channel 11 constructed by the two centralizers 2, a part of the casing 4, the oil pipe 3 and a part of the bottom fluid 5 in fig. 1; or short-distance backflow is carried out through a short-distance backflow channel 11 constructed by the two centralizers 2, a part of the oil pipe 3, a part of the bottom liquid 5 and a part of the soil layer 6. Meanwhile, the electromagnetic signals are subjected to remote backflow through a remote backflow channel 10 which is constructed by a casing 4, an oil pipe 3, a soil layer 6 and bottom liquid 5 outside the short-distance signal channel. According to the short-distance backflow and/or long-distance backflow shown in fig. 2, during the short-distance backflow and/or long-distance backflow process, a small part of the electromagnetic signals transversely leak through the soil layer 6 between the casing 4 and the oil pipe 3 or outside the casing 4, and a plurality of parts can longitudinally propagate and be detected by the surface receiver 7.
The cased hole channel electromagnetic simulation analysis method in the present embodiment is executed in the server in fig. 2.
The server generally includes a memory and a processor. The memory mainly comprises a program storage area and a data storage area; the storage program area may store an operating system, an application program required for at least one function, a program related to the present embodiment, and the like. And the storage data area may store data created according to the use of the first client. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, and other volatile solid state storage devices. The processor provides high speed computing capability and is capable of calling and executing programs stored in the memory. In the embodiment, the server is configured in a machine room and configured and overhauled by professional operation and maintenance personnel.
The server implements the steps in the cased hole channel electromagnetic simulation analysis method based on the above configured hardware is shown in fig. 2.
And S100, dividing the cased well channel with the misadjusted aspect ratio into a near-field model and a far-field model based on the signal transmission characteristics.
Fig. 1 shows a near field model 8, which is a combination of a downhole transmitter, two centralizers, a tubing and casing including portions of the downhole transmitter and the centralizers, a bottom fluid between the tubing and the casing, and a portion of a soil layer between the tubing and the casing in a vertical direction, i.e., a first near return channel and a second near return channel. The longitudinal length of the oil pipe and the sleeve in the near-field model 8 is 20-50 m.
Meanwhile, in fig. 1, it is shown that the oil pipe and casing not including the downhole transmitter and the centralizer, the well bottom fluid outside the oil pipe and casing, and a part of the soil mass layer outside the oil pipe and casing in the vertical direction constitute a far field model 9, that is, the far distance return channel is the far field model 9. The longitudinal length of the oil pipe and the sleeve in the far-field model 9 is 1 km-4 km. The oil pipe, the casing pipe, the bottom liquid and the soil layer of the far-field model 9 and the near-field model 8 are mutually connected.
S200, establishing excitation and load relations of the near field model and the far field model based on the road characteristics.
Specifically, the near field model and the far field model are analyzed based on the path characteristics, the near field model and the far field model shown in fig. 3 are equivalent to a series circuit load network, and the downhole transmitter is equivalent to an external excitation source of the circuit load network
. In the figure, a far-field model is equivalent to an equivalent load R in near-field domain analysis; in far-field domain analysis, the near-field model is equivalent to an equivalent excitation source containing equivalent internal resistance r
. The excitation and load relationship is that an equivalent excitation source including equivalent internal resistance equivalent to the near field model and the far field model is connected in series to an equivalent load.
S300, simulating and analyzing the near field model based on the excitation and load relation to obtain an equivalent excitation source of the near field model
Equivalent excitation source
Equivalent internal resistance r and voltage ratio of
。
Specifically, in this embodiment, when the S300 is executed, the server executes the steps in fig. 4.
S310, analyzing the near field model based on finite element simulation software, and performing simulation analysis to obtain a near field end surface potential value of the near field model, wherein the near field end surface potential value is equivalent to an equivalent excitation source
Excitation value of, voltage ratio of
=
。
S320, establishing near-field short-circuit channels at two ends of the near-field model, wherein the near-field model and the near-field short-circuit channels form a near-field backflow model; analyzing the near-field reflux model based on finite element simulation software, and performing simulation analysis to obtain the near-field reflux current of the near-field reflux model
Equivalent internal resistance r =
。
S400, simulating and analyzing the far-field model based on the excitation and load relation, and obtaining the equivalent load R and the signal attenuation ratio of the far-field model
。
Specifically, in this embodiment, when the S400 is executed, the server executes the steps in fig. 5.
S400 equivalent load R and signal attenuation ratio
Configured to:
s410, analyzing the far-field model based on finite element simulation software, and carrying out simulation analysis to obtain the far-field and near-ground end surface potential value of the far-field model
And configuring the far fieldRemote excitation source of far-field remote end face of model
Signal attenuation ratio
=
。
S420, establishing far-field short-circuit channels at two ends of the far-field model, wherein the far-field model and the far-field short-circuit channels form a far-field backflow model; analyzing the far-field backflow model based on finite element simulation software, and simulating and analyzing the far-field backflow current of the far-field backflow model
Equivalent load R =
。
S500, obtaining the equivalent internal resistance R and the voltage division ratio of the equivalent load R based on excitation and load relation analysis
=
。
S600, obtaining a signal attenuation relation based on the excitation and load relation, and configuring the signal attenuation relation into a voltage ratio
Partial pressure ratio of
And signal attenuation ratio
The product of (d) is the signal attenuation relationship. Then the stimulus value is when the downhole transmitter is acting as an external stimulus source
The signal strength received by the ground receiver
=
。
Through the technical scheme, the cased well channel is reasonably divided based on the signal transmission characteristics, the excitation-load relation is established by utilizing a near-field model and a far-field model divided by the channel characteristics, the field problem is converted into an equivalent circuit to be analyzed, the numerical value relation of each part in the equivalent circuit is obtained by utilizing field simulation, and then the signal attenuation relational expression of the electromagnetic signal transmitted to the ground receiver by the underground transmitter is obtained, the attenuation rule of the electromagnetic signal along the cased well channel is described, and reference is provided for modulation and demodulation of the electromagnetic signal in practice.
Further, for a more clear description, the simulation analysis of the near-field model is performed in S310 and S320 in this embodiment. In the embodiment, a cased well with a longitudinal length of 1 km-4 km and a transverse length of 0.15 m-0.2 m is taken as an example, and the near-field model is analyzed based on finite element simulation software for exemplary explanation.
In the embodiment, an ANSYS Maxwell is exemplarily selected to perform simulation analysis on the near-field model.
ANSYS Maxwell is used for three-dimensional simulation of the near-field model. Then the solver configured in ANSYS Maxwell is the eddy current field, the length dimension unit is chosen to be mm, and the 1/4 near field model in fig. 6 is built.
Referring to fig. 6 and 7, in the three-dimensional simulation, the oil pipe of the present embodiment is a cylindrical structure, and the permeability of the material of the oil pipe is set to
Resistivity of
. Meanwhile, the three-dimensional simulation middle casing adopts a cylindrical structure with equal length and same axis with the oil pipe, and the material magnetic conductivity of the casing is configured as
Resistivity of
(ii) a And the magnetic permeability of the well bottom fluid between the casing and the oil pipe is
Has a resistivity of
. In this embodiment, the joint of the centralizer is of an annular gasket structure, and the magnetic permeability of the joint material is
Having an electrical conductivity of
。
The structure of the soil layer in the three-dimensional simulation is a cylindrical model coaxial with the oil pipe or the casing pipe, and the resistivity of the soil layer material is
。
In the three-dimensional simulation, a solving domain region of ANSYS Maxwell is configured into a cuboid containing a geological layer, and then master-slave boundary conditions and an external excitation source are configured
And mesh generation. Wherein the external excitation source
And the mesh division is carried out at the 1/2 cross section of the near-field model in the graph.
In the three-dimensional simulation, ANSYS Maxwell is finally solved, configured and solved,obtaining the near-field end surface potential value of the near-field model after simulation analysis
I.e. the open circuit voltage, is also the excitation value of the equivalent excitation source in the near field model.
Preferably, the sizes of the structures in the near-field model are configured to be 20m long, 70mm inner diameter and 5mm thick oil pipe cylinder, 20m long, 139mm inner diameter and 10mm thick casing pipe cylinder, the parameters of the two joint annular gaskets are respectively 80mm inner diameter, 139mm outer diameter and 1.5mm thick, the distance between each joint annular gasket and the head end and the tail end is 0.5m, and the length of the soil layer cylinder is 20m, 159mm inner diameter and 900mm outer diameter.
Further, for a more clear description, the simulation analysis of the far-field model is performed in S410 and S420 in this embodiment. In the embodiment, a cased well with the longitudinal length of 1 km-4 km and the transverse length of 0.15 m-0.2 m is taken as an example, and the far-field model is analyzed based on finite element simulation software for exemplary explanation.
The present embodiment also exemplarily selects ANSYS Maxwell to perform simulation analysis on the far-field model.
ANSYS Maxwell is used for two-dimensional simulation of near-field models. Then the solver configured in ANSYS Maxwell selects m for the ac field, the length scale unit, and builds with 1/2 far field model in fig. 8.
Referring to fig. 8, in the two-dimensional simulation, the oil pipe, the casing, the centralizer joint and the geological layer are simplified into equal-length rectangles, and the longitudinal length of the geological layer is 2000 m. Meanwhile, the magnetic permeability and the resistivity of the materials of the structures such as the oil pipe, the casing pipe, the centralizer, the well bottom liquid, the soil layer and the like in the two-dimensional simulation are consistent with the magnetic permeability and the resistivity of the materials of the corresponding structures of the ANSYS Maxwell for carrying out the three-dimensional simulation on the near-field model.
Then, in the two-dimensional simulation, the solution domain is configured into equal-length rectangles, master-slave boundary conditions, far-field far-ground end surface potential values and grid subdivision are configured; and the potential value of the far-field far-ground end face is configured on the far-ground end face of the far-field model, and the grid division is carried out large-scale division.
In the two-dimensional simulation, ANSYS Maxwell is finally solved, configured and solved, and the near-ground end surface potential value of the far-field model is obtained after simulation analysis
Signal attenuation ratio
=
。
Further, the present embodiment discloses a computer-readable storage medium. The readable storage medium of this embodiment temporarily or permanently stores a computer program for executing the method for electromagnetic simulation analysis of cased hole channel, and the computer program implements the steps of the method when executed by a server or a terminal.
Meanwhile, the embodiment discloses a cased well channel electromagnetic simulation analysis device.
Referring to fig. 9, the apparatus includes a model configuration module, a relationship configuration module, a near-field model analysis module, a far-field model analysis module, and an equivalent processing module.
The model configuration module divides the cased well channel with the misadjusted aspect ratio into a near-field model and a far-field model based on the signal transmission characteristics; the relation configuration module establishes excitation and load relations of the near field model and the far field model based on the road characteristics; the near-field model analysis module simulates and analyzes the near-field model based on the excitation and load relation to obtain an equivalent excitation source of the near-field model, and the equivalent internal resistance and voltage ratio of the equivalent excitation source; the far-field model analysis module simulates and analyzes the far-field model based on the excitation and load relation to obtain the equivalent load and the signal attenuation ratio of the far-field model; the equivalent processing module is used for analyzing the excitation and load relationship, equivalent internal resistance and the voltage division ratio of the equivalent load, and acquiring the signal attenuation relationship of the cased well channel based on the excitation and load relationship, the voltage ratio, the signal attenuation ratio and the voltage division ratio.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A cased hole channel electromagnetic simulation analysis method, wherein the method when executed comprises:
s100, dividing cased well channels with misadjusted aspect ratios into a near field model and a far field model based on signal transmission characteristics;
s200, establishing excitation and load relations of the near field model and the far field model based on the road characteristics;
s300, carrying out simulation analysis on the near field model based on the excitation and load relation, and obtaining an equivalent excitation source of the near field model, and the equivalent internal resistance and voltage ratio of the equivalent excitation source;
s400, carrying out simulation analysis on the far-field model based on the excitation and load relation to obtain an equivalent load and a signal attenuation ratio of the far-field model;
s500, analyzing the relation between the excitation and the load, and comparing the equivalent internal resistance with the voltage division ratio of the equivalent load;
s600, acquiring a signal attenuation relation of the cased well channel based on the excitation and load relation, the voltage ratio, the signal attenuation ratio and the voltage division ratio;
the equipment for forming the cased well channel comprises an underground transmitter, two centralizers, an oil pipe, a casing and a ground receiver;
the casing pipe is drilled into a soil layer, the oil pipe is in clearance fit in the casing pipe, a well bottom liquid is filled between the oil pipe and the casing pipe, the underground transmitter is installed on the oil pipe, the two centralizers are installed on the oil pipe, and the centralizers are respectively deployed at two ends of the underground transmitter; the ground receiver is deployed on the ground;
establishing the near-field model and the far-field model in S100, and configuring to:
the downhole transmitter, the two centralizers, the tubing and casing covering at least the downhole transmitter, the centralizer portions, the bottom-hole fluid, and a portion of the earthen formation comprise the near-field model; the far field model is composed of the tubing, the casing, and a portion of the earthen formation not covered by the downhole launcher, the centralizer portion.
2. The cased hole channel electromagnetic simulation analysis method of claim 1,
establishing the excitation and load relationship in S200, configured to:
when a far-field model is analyzed based on road characteristics, the underground transmitter is equivalent to an external excitation source, and the centralizer, the oil pipe and the part of the casing pipe, the well bottom liquid and the soil layer in the near-field model are equivalent to the equivalent excitation source containing the equivalent internal resistance; when the near-field model is analyzed based on the road characteristics, the oil pipe, the sleeve part, the well bottom liquid and the soil texture layer in the far-field model are equivalent to equivalent loads; and establishing the excitation and load relationship according to the equivalent excitation source equivalent to the near field model, the equivalent internal resistance and the equivalent load equivalent to the far field model.
3. The cased-hole channel electromagnetic simulation analysis method of claim 2,
s300, obtaining the equivalent excitation source, the equivalent internal resistance and the voltage ratio, and configuring as follows:
s310, analyzing the near field model based on finite element simulation software, and performing simulation analysis to obtain a near field end surface potential value of the near field model, wherein the near field end surface potential value is equivalent to an excitation value of the equivalent excitation source, and the voltage ratio is a ratio of the equivalent excitation source to the external excitation source;
s320, establishing near-field short-circuit channels at two ends of the near-field model, wherein the near-field model and the near-field short-circuit channels form the near-field reflux model; analyzing the near-field reflux model based on finite element simulation software, and performing simulation analysis to obtain the near-field reflux current of the near-field reflux model, wherein the resistance value of the equivalent internal resistance is the ratio of the near-field end surface potential value to the near-field reflux current.
4. The cased hole channel electromagnetic simulation analysis method of claim 3,
analyzing the near field model based on finite element simulation software configured to:
the finite element simulation software is configured to simulate the near field model in three dimensions;
the finite element simulation software configuration solver is an eddy current field, a cylindrical structure of the oil pipe in the near field model three-dimensional simulation is established 1/4, and the magnetic conductivity and the resistivity of the oil pipe are configured;
in the three-dimensional simulation, the sleeve adopts a cylindrical structure with the same length and the same axis as the oil pipe, and the magnetic conductivity and the resistivity of the sleeve are configured;
configuring the magnetic conductivity and the resistivity of the well bottom liquid in three-dimensional simulation; in the three-dimensional simulation, the centralizer is of an annular gasket structure, and the magnetic conductivity and the electric conductivity of the centralizer are configured;
selecting a cylindrical model coaxial with the oil pipe and configuring the resistivity of the soil layer in the three-dimensional simulation;
in the three-dimensional simulation, a solution domain is configured to be a cuboid containing a soil layer, master-slave boundary conditions, the external excitation source and mesh subdivision are configured;
the external excitation source is configured at the 1/2 cross section of the near field model, and the mesh division is small-scale division;
and performing solving configuration and solving in the three-dimensional simulation.
5. The cased-hole channel electromagnetic simulation analysis method of claim 2,
s400, configuring the equivalent load and signal attenuation ratio as:
s410, analyzing the far-field model based on finite element simulation software, and carrying out simulation analysis to obtain a far-field near ground end surface potential value of the far-field backflow model and a far ground excitation source for configuring a far-field far ground end surface of the far-field model, wherein the signal attenuation ratio is the ratio of the far-field near ground end surface potential value to the far ground excitation source;
s420, establishing far-field short-circuit channels at two ends of the far-field model, wherein the far-field model and the far-field short-circuit channels form the far-field backflow model; analyzing the far-field backflow model based on finite element simulation software, and performing simulation analysis to obtain the far-field backflow current of the far-field backflow model, wherein the resistance value of the equivalent load is the ratio of the far-field ground-near end surface potential value to the far-field backflow current.
6. The cased-hole channel electromagnetic simulation analysis method of claim 5,
analyzing the far-field model based on finite element simulation software, configured to:
the finite element simulation software is configured to simulate the far field model in two dimensions;
the finite element simulation software configuration solver is an alternating current field, and the far field model is established 1/2; in the two-dimensional simulation, the oil pipe, the casing, the centralizer and the soil layer are rectangles with equal length;
configuring the oil pipe, the casing, the centralizer, and the magnetic permeability and the resistivity of part of the bottom liquid and part of the soil layer in two-dimensional simulation;
in the two-dimensional simulation, a solution domain is configured into an equal-length rectangle, and master-slave boundary conditions, the far-field far-ground end surface potential value and grid subdivision are configured;
the potential value of the far-field far-ground end face is configured on the far-ground end face of the far-field model, and the grid division is carried out large-scale division;
and performing solving configuration and solving in the two-dimensional simulation.
7. The cased-hole channel electromagnetic simulation analysis method of claim 2,
s600, obtaining a signal attenuation relation, wherein the product of the voltage ratio, the voltage division ratio and the signal attenuation ratio is configured as the signal attenuation relation.
8. A computer-readable storage medium, in which a computer program is stored for executing the method for cased hole channel electromagnetic simulation analysis according to any of claims 1 to 7.
9. A cased well channel electromagnetic simulation analysis device is characterized in that,
the device comprises a model configuration module, a relation configuration module, a near-field model analysis module, a far-field model analysis module and an equivalent processing module;
the model configuration module divides cased well channels with misadjusted aspect ratios into a near field model and a far field model based on signal transmission characteristics; the equipment for forming the cased well channel comprises an underground transmitter, two centralizers, an oil pipe, a casing and a ground receiver; the casing pipe is drilled into a soil layer, the oil pipe is in clearance fit in the casing pipe, a well bottom liquid is filled between the oil pipe and the casing pipe, the underground transmitter is installed on the oil pipe, the two centralizers are installed on the oil pipe, and the centralizers are respectively deployed at two ends of the underground transmitter; the ground receiver is deployed on the ground;
the model configuration module establishes the near-field model and the far-field model, and is configured to: the downhole transmitter, the two centralizers, the tubing and casing covering at least the downhole transmitter, the centralizer portions, the bottom-hole fluid, and a portion of the earthen formation comprise the near-field model; the far field model is composed of the tubing, the casing, and a portion of the earthen formation not covered by the downhole launcher, the centralizer portion;
the relationship configuration module establishes excitation and load relationships of the near field model and the far field model based on path characteristics;
the near-field model analysis module simulates and analyzes the near-field model based on the excitation and load relation to obtain an equivalent excitation source of the near-field model and the equivalent internal resistance and voltage ratio of the equivalent excitation source;
the far-field model analysis module simulates and analyzes the far-field model based on the excitation and load relation to obtain the equivalent load and the signal attenuation ratio of the far-field model;
the equivalent processing module obtains a signal attenuation relation of the cased well channel based on the excitation and load relation analysis, the equivalent internal resistance and the voltage division ratio of the equivalent load, and the excitation and load relation, the voltage ratio, the signal attenuation ratio and the voltage division ratio.
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