Automatic power-up method and system based on logging system

Abstract

The invention discloses an automatic power-up method and system based on a logging system, and the method comprises the steps: comparing a smaller value in a first cable voltage drop and a second cable voltage drop as a cable voltage drop value, enabling a computer to be unable to obtain a voltage measurement value of an underground cable head when the voltage of the underground cable head does not reach the minimum working voltage of an underground instrument, and enabling the value to be 0, the voltage drop value of the cable is estimated according to the first cable voltage drop; when the voltage of the underground cable head reaches the minimum working voltage of the instrument, the voltage value of the underground cable head can be obtained, the voltage drop value of the cable is obtained mainly through the voltage drop of the second cable, and the voltage drop of the first cable needs to be used for auxiliary judgment in consideration that the voltage of the underground cable head is low at the moment and underground communication and measurement are likely to be unstable. And an instrument is prevented from being damaged by too high output voltage of the power supply caused by a wrong Uch value. And when the voltage value of the underground cable head is close to the output voltage of the power supply, power-up is completed. Therefore, the method provided by the invention can solve the problems in the prior art.

Description

Technical Field

[0001] The present invention belongs to the field of geophysical logging, and relates to an automatic power-on method and system based on a logging system. Background Art

[0002] Generally, a logging system consists of a surface system, a cable, and downhole instruments. The surface system mainly consists of functional modules such as a power supply, surface telemetry communication, and a logging computer. At the start of logging, the power supply of the surface system needs to supply power to the downhole instruments through the cable. Since the logging cable is very long, there will be a large voltage drop on the cable, resulting in the supply voltage reaching the downhole instruments (becoming the downhole cable head voltage) being inconsistent with the output voltage of the surface power supply, and the voltage difference value changes with the cable transmission mode and the change of the instrument current. For a long time, most logging systems have used the manual power-on method, and the logging operator makes a manual judgment for power-on according to the output voltage, current value of the power supply and the empirical value of the cable head voltage, with a slow speed and high requirements for the operator. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of slow speed and high requirements for operators in the existing power-on method, and to provide an automatic power-on method and system based on a logging system.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An automatic power-on method based on a logging system proposed by the present invention includes the following steps:

[0006] Raise the output voltage of the power supply of the logging system from 0 to U, and obtain the output voltage value and output current value of the power supply of the logging system;

[0007] Obtain the first cable voltage drop and the second cable voltage drop according to the output voltage value and output current value of the power supply of the logging system;

[0008] The smaller value of the first cable voltage drop and the second cable voltage drop is the cable voltage drop value. Combine the cable voltage drop value and the input voltage to obtain the power supply output value of the logging system, then the automatic power-on of the logging system is realized.

[0009] Preferably, the method for obtaining the first cable voltage drop Uc1 is as follows:

[0010] Uc1 = m * I * Rc

[0011] Wherein, Rc is the equivalent resistance of the cable, I is the output current value, and m is a safety factor.

[0012] Preferably, the method for obtaining the second cable voltage drop Uc2 is as follows:

[0013] Uc2 = Uo - Uch

[0014] Among them, Uo is the power supply output voltage, and Uch is the downhole cable head voltage.

[0015] Preferably, the method for the power supply output voltage Uo is as follows:

[0016] Uo = Uch + I * Rc

[0017] Among them, Rc is the equivalent resistance of the cable.

[0018] Preferably, after obtaining the power supply output current value, compare the power supply output current value with the maximum allowable output current. If the power supply output current value is greater than or equal to the maximum allowable output current, the power-on fails.

[0019] Preferably, after obtaining the cable voltage drop value, compare the power supply output current value with the maximum allowable output current. If the power supply output current value is greater than or equal to the maximum allowable output current, the power-on fails.

[0020] Preferably, the sum of the cable voltage drop value and the input voltage is the power supply output value of the logging system. At this time, the downhole cable head voltage differs from the power supply output voltage value of the logging system by ±5%, that is, the automatic power-on of the logging system is realized.

[0021] An automatic power-on system based on a logging system proposed by the present invention includes:

[0022] An initial value acquisition module, which is used to raise the power supply output voltage of the logging system from 0 to U, and obtain the power supply output voltage value and output current value of the logging system;

[0023] A cable voltage drop acquisition module, which is used to obtain the first cable voltage drop and the second cable voltage drop according to the power supply output voltage value and output current value of the logging system;

[0024] A power supply output value acquisition module, which is used to take the smaller value of the first cable voltage drop and the second cable voltage drop as the cable voltage drop value, and combine the cable voltage drop value and the input voltage to obtain the power supply output value of the logging system, thereby realizing the automatic power-on of the logging system.

[0025] A computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the automatic power-on method based on the logging system are realized.

[0026] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the automatic power-on method based on the logging system are realized.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] An automatic power-on method based on a logging system proposed by the present invention obtains a first cable voltage drop and a second cable voltage drop. The smaller value of the first cable voltage drop and the second cable voltage drop is the cable voltage drop value. When the downhole cable head voltage does not reach the minimum operating voltage of the downhole instrument, the computer cannot obtain the measured value of the downhole cable head voltage, and this value is 0. At this time, the voltage drop value on the cable is estimated by the first cable voltage drop. When the downhole cable head voltage reaches the minimum operating voltage of the instrument, the downhole cable head voltage value can be obtained. At this time, the voltage drop value on the cable is mainly obtained by the second cable voltage drop. Considering that the downhole cable head voltage is relatively low at this time and downhole communication and measurement may be unstable, the first cable voltage drop is needed to assist in the determination to avoid damage to the instrument caused by an excessive power supply output voltage due to an incorrect Uch value. When the downhole cable head voltage value is near the power supply output voltage, it is considered that the power-on is completed. The logging operator does not need to manually determine the power-on based on the empirical values of the power supply output voltage, current value, and cable head voltage, and the automatic power-on speed can be faster than that of the prior art, reducing the dependence on the experience of logging engineers, safely protecting the logging power supply system, and improving the on-site oil logging efficiency. Therefore, the method proposed by the present invention can automatically calculate and control the ground power supply to quickly and automatically power on the downhole instrument according to the measured values and cable configuration parameters.

[0029] An automatic power-on system based on a logging system proposed by the present invention realizes the automatic power-on of the logging system by dividing the system into an initial value acquisition module, a cable voltage drop acquisition module, and a power supply output value acquisition module. The modular idea is adopted to make each module independent of each other, which is convenient for unified management of each module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a flowchart of the automatic power-on method based on the logging system of the present invention.

[0032] Figure 2 It is a flowchart of the power-on control of the present invention.

[0033] Figure 3 It is a schematic diagram of the automatic power-on principle of the present invention.

[0034] Figure 4 It is a system diagram of the automatic power-on system based on the logging system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0038] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the inventive product is customarily placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0039] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0040] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected to" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The following further describes the present invention in detail with reference to the accompanying drawings:

[0042] A general logging system consists of a surface system, a long-distance cable, and downhole logging instruments. The surface system mainly consists of a programmable power supply, a computer, and a surface telemetry circuit. The downhole instruments mainly consist of a downhole telemetry instrument and downhole logging instruments with different functions, including radioactive nuclear logging instruments, electrical logging instruments, acoustic logging instruments, induction logging instruments, etc.

[0043] An automatic power-on method based on a logging system proposed by the present invention, as Figure 1 shown, includes the following steps:

[0044] S1. Raise the power output voltage of the logging system from 0 to U, and obtain the power output voltage value and output current value of the logging system;

[0045] After obtaining the power output current value, compare the power output current value with the maximum allowable output current. If the power output current value is greater than or equal to the maximum allowable output current, the power-on fails.

[0046] S2. Obtain the first cable voltage drop and the second cable voltage drop according to the power output voltage value and output current value of the logging system;

[0047] The method for obtaining the first cable voltage drop Uc1 is as follows:

[0048] Uc1 = m * I * Rc

[0049] where Rc is the equivalent resistance of the cable, I is the output current value, and m is a safety factor. Since Rc is an estimated value and not accurate enough, the m factor is required to ensure safety. The default value is 1, which is related to the estimation accuracy of Rc, and generally takes 1 - 1.2.

[0050] The method for obtaining the second cable voltage drop Uc2 is as follows:

[0051] Uc2 = Uo - Uch

[0052] where Uo is the power output voltage and Uch is the downhole cable head voltage.

[0053] The method for the power output voltage Uo is as follows:

[0054] Uo = Uch + I * Rc

[0055] Among them, Uo is the power supply output voltage, which is measured by the power supply; I is the power supply output current, which is measured by the power supply; Uch is the downhole cable head voltage, which is measured downhole and uploaded to the ground computer through telemetry communication, and can only be obtained after the downhole instrument is powered on and the telemetry communication is successful; Rc is the equivalent resistance of the cable, which is estimated from the cable characteristic parameters and the power supply mode. Uo and I can be considered accurate and reliable, while the Uch value can only be considered accurate and reliable after it reaches a certain range of the standard value and the downhole instrument starts to work. Rc is an estimated value and can only be used as a reference.

[0056] S3. The smaller value of the first cable voltage drop and the second cable voltage drop is the cable voltage drop value. Combining the cable voltage drop value and the input voltage to obtain the power supply output value of the logging system, then the automatic power-on of the logging system is realized.

[0057] After obtaining the cable voltage drop value, compare the power supply output current value with the maximum allowable output current. If the power supply output current value is greater than or equal to the maximum allowable output current, it is determined as an open circuit fault and the power-on fails.

[0058] The sum of the cable voltage drop value and the input voltage is the power supply output value Uo' of the logging system, Uo' = U + Uc. At this time, the difference between the downhole cable head voltage and the power supply output voltage of the logging system is ±5%, that is, the automatic power-on of the logging system is realized.

[0059] The power-on control process is as Figure 2 shown, including the following two stages:

[0060] The first stage: The automatic power-on starts, and the power supply output Uo is controlled to increase from 0 to U. This process can be long or short, which is determined by the instrument adaptability.

[0061] The second stage: Obtain the values of Uo and I, calculate the cable voltage drop Uc. The first cable voltage drop Uc1 = m * I * Rc, the second cable voltage drop Uc2 = Uo - Uch. The smaller value of the first cable voltage drop Uc1 and the second cable voltage drop Uc2 is used as the cable voltage drop value Uc, and the power supply output value Uo' = U + Uc. When the downhole cable head voltage does not reach the minimum working voltage of the downhole instrument, the computer cannot obtain the Uch measurement value, and this value is 0. At this time, the voltage drop value Uc on the cable is estimated by the first cable voltage drop Uc1; when the downhole cable head voltage reaches the minimum working voltage of the instrument, the computer can obtain the Uch value. At this time, the voltage drop value Uc on the cable is mainly obtained by the second cable voltage drop Uc2.

[0062] Considering that the downhole cable head voltage is low at this time, the downhole communication and measurement may be unstable. It is necessary to use the first cable voltage drop Uc1 for auxiliary determination to avoid damage to the instrument caused by too high Uo output due to incorrect Uch value. When the Uch value reaches near the standard value U (the determination range can be set according to the actual situation of the system, the default is ±5%), it is considered that the power-on is completed. AsFigure 3 This is the schematic diagram of the automatic power-on for the logging system. Through the software program control of the power supply part of the surface system, the automatic power-on control of the logging system is realized.

[0063] The following is a description in combination with an example:

[0064] This embodiment is only used to illustrate rather than limit the technical solution of the present invention. When the iWAS logging system uses the LEAP instrument for logging, this automatic power-on method is adopted. The parameters and processes are as follows:

[0065] Voltage standard value U: The voltage standard value U at the cable head of the LEAP instrument is 250V;

[0066] Equivalent cable resistance Rc and safety factor m: The cable length is 7000 meters, and the standard resistance value of each cable core is 200 - 220 ohms. The main AC power supply loop is composed of cable cores (2#+6#) and (3#+5#), which is equivalent to the parallel connection of cable cores 2, 3, 5, and 6 in pairs and then in series. The equivalent cable resistance is exactly equal to the resistance of a single cable core, that is, Rc is 200 - 220 ohms. The selected value of Rc is 220 ohms, and the safety factor m = 1;

[0067] Maximum allowable current Imax: According to different instrument connection schemes, the maximum supply current of the instrument string will vary from 0.4 - 0.8A. Therefore, the default Imax is set to 1A. This value has a wide adaptability, which can not only allow abnormal instrument currents within a certain range but also stably ensure short-circuit determination.

[0068] When using this automatic power-on method for operation, the operator only needs to click the automatic power-on button on the logging software. The logging software will automatically control the output of the programmable power supply. When the voltage at the downhole cable head stabilizes near 250V, the power-on and the establishment of the communication connection are automatically completed. Since this method was put into use, it has been very popular and has received favorable feedback from various grass-roots operation teams.

[0069] An automatic power-on system based on the logging system proposed by the present invention, as Figure 4 shown, includes an initial value acquisition module, a cable voltage drop acquisition module, and a power supply output value acquisition module;

[0070] The initial value acquisition module is used to increase the power supply output voltage of the logging system from 0 to U, and acquire the power supply output voltage value and output current value of the logging system;

[0071] The cable voltage drop acquisition module is used to acquire the first cable voltage drop and the second cable voltage drop according to the power supply output voltage value and output current value of the logging system;

[0072] The power output value acquisition module is used to take the smaller value of the first cable voltage drop and the second cable voltage drop as the cable voltage drop value, and combine the cable voltage drop value and the input voltage to obtain the power output value of the logging system, thereby realizing the automatic power-on of the logging system.

[0073] The terminal device provided by the embodiment of the present invention includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in the above-mentioned device embodiments are implemented.

[0074] The computer program can be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention.

[0075] The terminal device may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory.

[0076] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0077] The memory can be used to store the computer program and / or module. The processor realizes various functions of the terminal device by running or executing the computer program and / or module stored in the memory, and by calling the data stored in the memory.

[0078] If the modules / units integrated in the terminal device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-described embodiment methods of the present invention, it can also be completed by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0079] An automatic power-on method based on a logging system proposed by the present invention has received unanimous praise from on-site operators after being actually applied in the iWAS ground system, and has the following advantages: 1) The power-on speed is fast and accurate, and the average power-on time is about 5 to 8 seconds. In contrast, the manual power-on generally takes more than 10 seconds, and the output voltage is controlled by a manual knob, which is not accurate enough; 2) The safety is greatly improved. This method uses a total of three protection methods, including dual judgment by two calculation methods plus short-circuit judgment, completely eliminating the occurrence of power-on accidents caused by various factors such as human manual operation errors, cable short circuits, and instrument short circuits; in the past, it was only possible to rely on operators to make manual judgments to avoid accidents caused by these factors; 3) The difficulty for operators is reduced. In the past, manual power-on had to be completed by operators who had received specialized training and had a certain understanding of each instrument string and had certain experience. Now, it can be completed with one key. This not only reduces the personnel cost of the company but also relieves the burden on grass-roots operators, allowing them to shift more attention to other operation matters.

[0080] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic power-on method based on a logging system, characterized in that, It includes the following steps: Raise the power output voltage of the logging system from 0 to U, and obtain the power output voltage value and output current value of the logging system; Obtain the first cable voltage drop and the second cable voltage drop according to the power output voltage value and output current value of the logging system; The smaller value of the first cable voltage drop and the second cable voltage drop is the cable voltage drop value. Combine the cable voltage drop value and the input voltage to obtain the power output value of the logging system, then the automatic power-on of the logging system is realized.

2. The automatic power-on method based on a logging system according to claim 1, characterized in that, The method for obtaining the first cable voltage drop Uc1 is as follows: Uc1 = m * I * Rc Wherein, Rc is the equivalent resistance of the cable, I is the output current value, and m is the safety factor.

3. The automatic power-on method based on a logging system according to claim 1, characterized in that, The method for obtaining the second cable voltage drop Uc2 is as follows: Uc2 = Uo - Uch Wherein, Uo is the power output voltage, and Uch is the downhole cable head voltage.

4. The automatic power-on method based on a logging system according to claim 3, characterized in that, The method for the power output voltage Uo is as follows: Uo = Uch + I * Rc Wherein, Rc is the equivalent resistance of the cable.

5. The automatic power-on method based on a logging system according to claim 1, characterized in that, After obtaining the power output current value, compare the power output current value with the allowable maximum output current. If the power output current value is greater than or equal to the allowable maximum output current, the power-on fails.

6. The automatic power-on method based on a logging system according to claim 1, characterized in that, After obtaining the cable voltage drop value, compare the power output current value with the allowable maximum output current. If the power output current value is greater than or equal to the allowable maximum output current, the power-on fails.

7. The automatic power-on method based on a logging system according to claim 1, characterized in that, The sum of the cable voltage drop value and the input voltage is the power output value of the logging system. At this time, the difference between the downhole cable head voltage and the power output voltage value of the logging system is ±5%, that is, the automatic power-on of the logging system is realized.

8. An automatic power-on system based on a logging system, characterized in that, It includes: An initial value acquisition module, which is used to raise the power output voltage of the logging system from 0 to U, and obtain the power output voltage value and output current value of the logging system; A cable voltage drop acquisition module, which is used to obtain the first cable voltage drop and the second cable voltage drop according to the power output voltage value and output current value of the logging system; A power output value acquisition module, which is used to take the smaller value of the first cable voltage drop and the second cable voltage drop as the cable voltage drop value, and combine the cable voltage drop value and the input voltage to obtain the power output value of the logging system, then the automatic power-on of the logging system is realized.

9. A computer device, including a memory and a processor, the memory stores a computer program, characterized in that, When the processor executes the computer program, it realizes the steps of the automatic power-on method based on the logging system as described in any one of claims 1 to 7.

10. A computer-readable storage medium, the computer-readable storage medium stores a computer program, characterized in that, When the computer program is executed by the processor, it realizes the steps of the automatic power-on method based on the logging system as described in any one of claims 1 to 7.

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