Miniaturized logging equipment system

Abstract

The invention discloses a miniaturized logging equipment system which comprises a power amplification module, a driving module, a cylindrical electrode module, a first digital-to-analog conversion module, a second digital-to-analog conversion module, a first processor, a second processor and a communication module. The first processor is sequentially connected with the first digital-to-analog conversion module, the driving module and the cylindrical electrode module; the cylindrical electrode module is connected with the power amplification module; the cylindrical electrode module is connected with the second digital-to-analog conversion module, and the second digital-to-analog conversion module is sequentially connected with the second processor and the communication module; the miniaturized logging equipment system has the advantages of high measurement precision, high stability, reliable measurement data, portability, easiness in operation and the like, and compared with conventional field measurement equipment, the size is reduced by one tenth, and the adaptability is high; the method can be applied to scenes of scientific research, actual teaching and the like, and has wide significance in characterization and evaluation of complex cracks and research of oil and gas characteristics in domestic carbonate rocks.

Description

Technical Field

[0001] The invention belongs to the technical field of control systems, and in particular relates to a miniaturized well logging equipment system. Background Art

[0002] Fractures and caves are important storage spaces and seepage channels for oil and gas reservoirs such as carbonate rocks and volcanic rocks. In particular, the existence and development degree of caves determine the storage properties of reservoirs. The identification and evaluation of caves are of great significance to oil exploration and development.

[0003] Existing logging methods have some problems in identifying fractures, such as: the measurement results of different systems at different fracture angles vary greatly, and it is difficult to accurately quantify parameters such as the direction, inclination and opening of the fracture. Geologists do not recognize these measurement curves very well. Therefore, there is an urgent need to build an experimental model in the laboratory to supplement the analysis of logging data. In order to improve the quality and recognition of the evaluation. If you want to build a formation model in the laboratory for physical simulation, then miniaturized logging equipment is essential. If normal-sized logging equipment is used for laboratory verification, since the detection radius is basically more than one meter, the formation model built in the laboratory will be very large, and the whole process will be very inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide a miniaturized logging equipment system. When encountering a formation environment that is difficult to interpret and evaluate, a model can be built in the laboratory to restore the field response. The formation response built in the laboratory is compared with the actual response to improve the accuracy of the interpretation and evaluation of the real formation.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A miniaturized well logging equipment system includes a power amplifier module, a drive module, a cylindrical electrode module, a first digital-to-analog conversion module, a second digital-to-analog conversion module, a first processor, a second processor and a communication module;

[0007] The first processor is connected to the first digital-to-analog conversion module, the driving module and the cylindrical electrode module in sequence; the cylindrical electrode module is connected to the power amplification module; the cylindrical electrode module is also connected to the second digital-to-analog conversion module, and the second digital-to-analog conversion module is connected to the second processor and the communication module in sequence;

[0008] The power amplification module is used to amplify the power of the cylindrical electrode module;

[0009] The driving module is used to superimpose the signal with the potential of the cylindrical electrode module to ensure that the potentials of the two points between the driving electrodes are equal;

[0010] The first digital-to-analog conversion module is used to convert the digital signal sent by the first processor into an analog signal;

[0011] The first processor is used to send a digital signal;

[0012] The second digital-to-analog conversion module is used to convert the voltage value at the electrode into a digital signal;

[0013] The second processor is used to process the digital signal converted from the electrode voltage;

[0014] The communication module is used to send information of the second processor.

[0015] Preferably, the cylindrical electrode module is a centrally symmetrical structure, with a main electrode at the center, and eight secondary electrodes symmetrically arranged on the upper and lower sides of the main electrode, with four secondary electrodes on each side;

[0016] Four monitoring electrodes are symmetrically arranged on the upper and lower sides of the main electrode; two monitoring electrodes on each side of the upper and lower sides;

[0017] The supervisory electrode is located between the main electrode and the secondary electrode closest to the main electrode.

[0018] Preferably, the two adjacent secondary electrodes are connected to the same driving module and the secondary electrode is feedback-connected to the driving module, and the main electrode, the monitoring electrode and the secondary electrode close to the main electrode are connected to the power amplification module on the one hand and to the second digital-to-analog conversion module on the other hand.

[0019] Preferably, the first digital-to-analog conversion module is a high-precision DAC.

[0020] Preferably, the second digital-to-analog conversion module is an AD converter,

[0021] Preferably, the first processor is STM32.

[0022] Preferably, the second processor is a FPAG.

[0023] Preferably, the communication module is ESP8226.

[0024] Preferably, the power amplification module includes a power amplifier, a first inductor and a second inductor, the main electrode is connected to the secondary electrode close to the main electrode through the second inductor, the supervisory electrode close to the main electrode is connected to the output end of the power amplifier, the supervisory electrode far from the main electrode is connected to the input end of the power amplifier, and the power amplifier is grounded through the first inductor.

[0025] The present invention uses the joint control of an STM32 processor and an FPGA processor to force the electrode current to penetrate into the formation through a soft and hard dual focusing method. A negative feedback loop is completed through a power amplifier, the potential difference between the monitoring electrodes is continuously reduced, and the output current is adjusted in real time to complete the hard focusing of the circuit. At the same time, the detected data is automatically calculated using FPGA to complete the soft focusing of the system. The combination of soft and hard focusing ensures the correct response of the miniaturized logging equipment circuit system. After hard focusing, the potential difference between A0 and the monitoring electrode cannot be absolutely equal to 0, and it will fluctuate around 0. Through an AD converter, the voltage at each electrode is converted from an analog signal to a digital signal, and read into the FPGA. The specific process of the soft focusing is: reading the electrode voltage value, judging the voltage difference between the electrodes, comparing with the preset resistivity value, if the difference is less than 0.001, then calculating the resistivity, outputting the resistivity value, and ending; if the difference is greater than 0.001, fitting the average voltage value, comparing with the preset resistivity value, calculating the fitting resistivity, outputting the resistivity value, and ending.

[0026] The miniaturized logging equipment system of the present invention adopts quasi-steady-state electromagnetic field theory, electric field focusing method and electronic information technology, and the obtained detection curve can be compared with the actual curve of the oil and gas detection site; the present invention has the advantages of high measurement accuracy, strong stability, reliable measurement data, light and easy operation, etc. Compared with conventional field measurement equipment, the size is reduced by one tenth and the adaptability is strong; it can accurately describe the response changes caused by the fracture opening, fracture inclination, fracture direction, etc. in the reservoir, and compare and analyze with the actual field system measurement model, obtain a large amount of laboratory data, and establish a database between underground fracture characteristics and measurement curves to achieve the purpose of evaluating oil and gas reservoirs; it can also be used for quantitative analysis of tunnel freezing construction water-stopping integrity evaluation; at the same time, it can be applied to scientific research, actual teaching and other scenarios, and the characterization and evaluation of complex fractures have broad significance for studying the oil and gas characteristics in domestic carbonate rocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the cylindrical electrode structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the power amplifier module of the present invention;

[0030] Figure 4 It is a soft focusing procedure diagram of the present invention. DETAILED DESCRIPTION

[0031] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0032] Unless otherwise defined, the up, down, left, right, front, back, inside and outside directions involved in this document are based on the up, down, left, right, front, back, inside and outside directions in the figures shown in the present invention, and are explained here together.

[0033] like Figure 1-3 A miniaturized well logging equipment system is shown, comprising a power amplifier module 1, a drive module 2, a cylindrical electrode module 3, a first digital-to-analog conversion module 4, a second digital-to-analog conversion module 5, a first processor 6, a second processor 7 and a communication module 8;

[0034] The first processor 6 is connected to the first digital-to-analog conversion module 4, the driving module 2 and the cylindrical electrode module 3 in sequence; the cylindrical electrode module 3 is connected to the power amplification module 1; the cylindrical electrode module 3 is also connected to the second digital-to-analog conversion module 5, and the second digital-to-analog conversion module 5 is connected to the second processor 7 and the communication module 8 in sequence;

[0035] The power amplification module 1 is used to amplify the power of the cylindrical electrode module 3;

[0036] The driving module 2 is used to superimpose the signal with the potential of the cylindrical electrode module 3 to ensure that the potentials of the two points between the driving electrodes are equal;

[0037] The first digital-to-analog conversion module 4 is used to convert the digital signal sent by the first processor 6 into an analog signal;

[0038] The first processor 6 is used to send a digital signal;

[0039] The second digital-to-analog conversion module 5 is used to convert the voltage value at the electrode into a digital signal;

[0040] The second processor 7 is used to process the digital signal converted from the electrode voltage;

[0041] The communication module 8 is used to send the information of the second processor.

[0042] Figure 1 and 2As shown, the cylindrical electrode module 3 is a centrally symmetrical structure, with a main electrode 30 at the center, and eight secondary electrodes are symmetrically arranged on the upper and lower sides of the main electrode 30, with four secondary electrodes on each side; the secondary electrodes are secondary electrode 31, secondary electrode 32, secondary electrode 33, secondary electrode 34 ( Figure 1 Only the lower working part of the middle cylindrical electrode is drawn, and the structure of the upper working part is the same); in the figure 2, the blue part is the main electrode 30, the auxiliary electrode 31, the auxiliary electrode 32, the auxiliary electrode 33, and the auxiliary electrode 34 from the center to both sides, the green part is the insulator used for isolation between the electrodes, and the purple part is the monitoring electrode.

[0043] Four supervisory electrodes are symmetrically arranged on the upper and lower sides of the main electrode 30 ; two supervisory electrodes are arranged on each side of the upper and lower sides; the supervisory electrodes are supervisory electrode 301 and supervisory electrode 302 in order from near to far from the main electrode 30 .

[0044] The supervisory electrode is located between the main electrode 30 and the secondary electrode 31 closest to the main electrode 30 .

[0045] The two adjacent secondary electrodes are connected to the same driving module 2 and the secondary electrode is feedback-connected to the driving module 2 . The main electrode 30 , the monitoring electrode and the secondary electrode 31 are connected to the power amplification module 1 on one hand and to the second digital-to-analog conversion module 5 on the other hand.

[0046] The first digital-to-analog conversion module 4 is a high-precision DAC; the second digital-to-analog conversion module 5 is an AD converter; the first processor 6 is STM32; the second processor 7 is FPAG; and the communication module 8 is ESP8226.

[0047] The power amplification module 1 includes a power amplifier 9, a first inductor 10 and a second inductor 11. The main electrode 30 is connected to the secondary electrode 31 through the second inductor 11. The supervisory electrode 301 is connected to the output end of the power amplifier 9. The supervisory electrode 302 is connected to the input end of the power amplifier 9. The power amplifier 9 is grounded through the first inductor 10.

[0048] When the system of the present invention is working, it is divided into a soft and hard dual focusing method. The hard focusing is mainly based on the structure of the present invention, specifically: the first processor 6 sends a digital signal, which is converted into an analog signal through the first data conversion module 4. The analog signal is superimposed on the potential of the cylindrical electrode module 3 of the driving module 2 to ensure that the two-point pole potential between the driving electrodes is equal. After passing through the power amplification module 1, the signal is transmitted to the second digital-to-analog conversion module 5, and the voltage value at the electrode is converted into a digital signal, which is then transmitted to the second processor 7 to realize soft focusing, and finally the data is sent and transmitted through the communication module.

[0049] like Figure 4As shown, the specific process of soft focusing is: reading the electrode voltage value, determining the voltage difference between the electrodes, and comparing it with the preset resistivity value. If the difference is less than 0.001, the resistivity is calculated, the resistivity value is output, and the process ends; if the difference is greater than 0.001, the average voltage value is fitted, and the voltage difference between the electrodes is compared with the preset resistivity value, the fitting resistivity is calculated, the resistivity value is output, and the process ends.

[0050] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized well logging equipment system, characterized in that: It includes a power amplification module, a driving module, a cylindrical electrode module, a first digital-to-analog conversion module, a second digital-to-analog conversion module, a first processor, a second processor and a communication module; The first processor is connected to the first digital-to-analog conversion module, the driving module and the cylindrical electrode module in sequence; the cylindrical electrode module is connected to the power amplification module; the cylindrical electrode module is also connected to the second digital-to-analog conversion module, and the second digital-to-analog conversion module is connected to the second processor and the communication module in sequence; The power amplification module is used to amplify the power of the cylindrical electrode module; The driving module is used to superimpose the signal with the potential of the cylindrical electrode module to ensure that the potentials of the two points between the driving electrodes are equal; The first digital-to-analog conversion module is used to convert the digital signal sent by the first processor into an analog signal; The first processor is used to send a digital signal; The second digital-to-analog conversion module is used to convert the voltage value at the electrode into a digital signal; The second processor is used to process the digital signal converted from the electrode voltage; The communication module is used to send information of the second processor.

2. A miniaturized well logging equipment system according to claim 1, characterized in that: The cylindrical electrode module is a centrally symmetrical structure, with a main electrode at the center, eight secondary electrodes symmetrically arranged on the upper and lower sides of the main electrode, and four supervisory electrodes symmetrically arranged on the upper and lower sides of the main electrode; the supervisory electrode is located between the main electrode and the electrode closest to the main electrode.

3. A miniaturized well logging equipment system according to claim 2, characterized in that: The two adjacent secondary electrodes are connected to a driving module and the secondary electrodes are feedback-connected to the driving module. The main electrode, the monitoring electrode and the secondary electrode close to the main electrode are connected to the power amplification module on one hand and to the second digital-to-analog conversion module on the other hand.

4. A miniaturized well logging equipment system according to claim 1, characterized in that: The first digital-to-analog conversion module is a high-precision DAC.

5. A miniaturized well logging equipment system according to claim 1, characterized in that: The second digital-to-analog conversion module is an AD converter.

6. A miniaturized well logging equipment system according to claim 1, characterized in that: The first processor is STM32.

7. A miniaturized well logging equipment system according to claim 1, characterized in that: The second processor is FPAG.

8. A miniaturized well logging equipment system according to claim 1, characterized in that: The communication module is ESP8226.

9. A miniaturized well logging equipment system according to claim 2, characterized in that: The power amplifier module includes a power amplifier, a first inductor and a second inductor. The main electrode is connected to the secondary electrode close to the main electrode through the second inductor. The supervisory electrode close to the main electrode is connected to the output end of the power amplifier. The supervisory electrode far from the main electrode is connected to the input end of the power amplifier. The power amplifier is grounded through the first inductor.

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