Universal logging cable artificial magnetic mark accurate discrimination and detection device

Abstract

The utility model discloses a using type logging cable artificial magnetic mark accurate discrimination detection device comprising a Hall sensor, a signal operation amplification unit, an indicating lamp, a multimeter display unit, and a power supply for supplying power to the Hall sensor and the signal operation amplification unit. The signal output end of the Hall sensor is connected with the input end of the signal operational amplification unit, and the output end of the operational amplification unit is connected with the universal meter display unit. The manual magnetic injection point on the cable to be detected is detected through the Hall sensor, the operation is simple, and the judgment is accurate.

Description

Technical Field

[0001] This utility model belongs to the field of logging cable testing technology, specifically relating to a general-purpose logging cable artificial magnetic mark accurate identification and testing device. Background Technology

[0002] Logging cables are used for logging, perforation, and coring operations in various oil and gas wells. They can also be used for water conservancy and hydrological surveying, coalfield geological exploration, and geothermal logging. They serve as connecting cables between surface systems and underground instruments for load-bearing connections and for transmitting measurement data.

[0003] Load-bearing logging cables are electrical equipment cables whose main functions are to withstand tensile force, provide power to the system, transmit signals, and control depth. They are used in logging, perforation, and coring operations in various oil and gas wells. The purpose of logging cables is to detect various downhole parameters. A crucial function of logging cables is to transmit various downhole instruments, relay signals between the surface control system and downhole instruments, and obtain depth and location information from the well.

[0004] Because cables are magnetized by external magnetic fields in a geomagnetic environment, this affects the magnetic marks obtained through pre-measurement and manual magnetization. Furthermore, when recutting cables to make cable bridles, the zero length of the cable must be pre-set. To address common operational problems and technological innovations, such as multiple suspected magnetic mark points on cables, inaccurate positioning of magnetic mark points using geological compasses, difficulty for beginners to master traditional methods of identifying magnetic mark points using geological compasses, and a high probability of misjudgment even among experienced workers, the detection device described in this paper has been developed, providing important reference for cable maintenance. Traditional magnetic mark detection uses a geological compass. When the geological compass moves along the cable direction and encounters a magnetic mark, the compass needle deflects, thus identifying the magnetic mark. However, due to limitations in both the accuracy of the geological compass itself and the operator's experience, problems arise such as difficulty in identifying multiple suspected magnetic mark points and a high misjudgment rate due to insufficient experience among beginners.

[0005] Chinese utility model patent (application number 912148306) discloses a magnetic mark calibrator for marking the depth of logging cables in mines. It mainly consists of a magnetization circuit, a midpoint detection circuit, a computer circuit, a magnetization coil, and a receiving coil. It can automatically mark the depth of the cable, but it cannot accurately judge the marked magnetic mark. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems and provide a general-purpose device for accurately identifying and detecting artificial magnetic marks on well logging cables that is simple to operate and accurate in judgment.

[0007] To achieve the above objectives, this utility model provides a general-purpose device for accurately identifying and detecting artificial magnetic marks on well logging cables, including a Hall sensor, a signal processing and amplification unit, an indicator light and a multimeter display unit, and a power supply for powering the Hall sensor and the signal processing and amplification unit. The signal output terminal of the Hall sensor is connected to the input terminal of the signal processing and amplification unit, and the output terminal of the signal processing and amplification unit is connected to the multimeter display unit.

[0008] Furthermore, the signal amplification unit includes amplifiers U1A, U1B, and U1C. The signal output terminal of the Hall sensor is connected to the non-inverting input terminal of amplifier U1A via potentiometer RP3. The inverting input terminal and output terminal of amplifier U1A are both connected to the inverting input terminal of amplifier U1C via resistor R6, and the other is connected to the output terminal of amplifier U1C via gain potentiometer RP1. The output terminal of the power supply is connected to the inverting input terminal of amplifier U1B via resistor R2, zero-adjustment potentiometer RP2, and resistor R3, and the other is connected to the output terminal of amplifier U1B via resistor R4 and then to the inverting input terminal of amplifier U1C via resistor R7. The output terminal of amplifier U1C is connected to the multimeter display unit.

[0009] Furthermore, the non-inverting input terminal of amplifier U1B is grounded via resistor R5, and the non-inverting input terminal of amplifier U1C is grounded via resistor R8.

[0010] Furthermore, the Hall sensor is arranged on the housing of the multimeter display unit.

[0011] Furthermore, it also includes indicator lights embedded in the housing of the multimeter display unit, with the power supply providing power to the indicator lights.

[0012] Furthermore, the signal processing and amplification unit and the power supply are built into the multimeter display unit.

[0013] Compared with the prior art, the advantages of this utility model are: this utility model detects artificial magnetization points on the cable under test using a Hall sensor, which is simple to operate and accurate in judgment. Attached Figure Description

[0014] Figure 1 This is a structural block diagram of the general-purpose well logging cable artificial magnetic mark accurate identification and detection device of this utility model;

[0015] Figure 2 for Figure 1 Circuit diagram of the signal operational amplifier unit. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific examples.

[0017] like Figure 1The universal logging cable artificial magnetic mark accurate identification and detection device shown includes a Hall sensor 1, a signal processing and amplification unit 2, an indicator light 5, and a multimeter display unit 3, as well as a power supply 4 that supplies power to the Hall sensor 1 (model SS49E), the signal processing and amplification unit 2, and the indicator light 5. The Hall sensor 1 is arranged on the housing of the multimeter display unit 3, the indicator light 5 is embedded in the housing of the multimeter display unit 3, and the signal processing and amplification unit 2 and the power supply 4 are built into the multimeter display unit 3. The Hall sensor outputs the detected magnetic signal to the signal processing and amplification unit and then displays it on the multimeter display unit.

[0018] like Figure 2 The signal operational amplifier unit shown includes amplifiers U1A, U1B, and U1C. The signal output terminal of the Hall sensor is connected to the non-inverting input terminal of amplifier U1A via potentiometer RP3. The inverting input and output terminals of amplifier U1A are connected to the inverting input terminal of amplifier U1C via resistor R6, and the other is connected to the output terminal of amplifier U1C via gain potentiometer RP1. The output terminal of the power supply is connected to the inverting input terminal of amplifier U1B via resistor R2, zero-adjustment potentiometer RP2, and resistor R3, and the other is connected to the output terminal of amplifier U1B via resistor R4 and then to the inverting input terminal of amplifier U1C via resistor R7. The output terminal of amplifier U1C is connected to the multimeter display unit. The non-inverting input terminal of amplifier U1B is grounded via resistor R5, and the non-inverting input terminal of amplifier U1C is grounded via resistor R8.

[0019] Amplifier U1A tracks the signal output from the Hall sensor. Amplifier U1B forms an inverting proportional operational amplifier and acts as a zero-adjustment circuit, ensuring that the output signal of amplifier U1B is zero when there is no external magnetic field (the zero-adjustment unit is composed of zero-adjustment potentiometer RP2). Amplifier U1C forms an inverting summer circuit, summing the signals output from amplifiers U1A and U1B, and then inverting and amplifying the summed signal. The amplification factor is determined by the value of gain potentiometer RP1, and the voltage signal output range of the entire device can be changed by adjusting the resistance value of gain potentiometer RP1.

[0020] The principle of this invention is as follows: When the Hall sensor probe approaches the surface of the cable to be tested, if the cable surface is not an artificially magnetized point, the Hall sensor will not have a large voltage fluctuation output. If the Hall sensor probe is approaching an artificially magnetized point, since the artificially magnetized point is a magnetic marker point, although it has a magnetic field value higher than the ambient magnetic field, a compass cannot accurately distinguish between the magnetized point and the geomagnetized magnetic field. Therefore, by adjusting the gain potentiometer RP1, the magnetoelectric conversion signal collected by the Hall sensor is amplified. Because natural magnetization has subtle differences that are difficult to distinguish with a compass needle in the face of artificially magnetized points, achieving a higher voltage amplitude through gain amplification allows for a clear distinction. After the gain adjustment reaches the critical value, the signal is processed by an inverting summator (inverting adder) to obtain the DC voltage value. Since the previous gain potentiometer RP1 amplifies the voltage gain to a high value, the output can clearly distinguish between artificial magnetization points and natural magnetization at the numerical level. By observing suspicious magnetization points and comparing values, the location of the magnetic mark point can be accurately determined. If it is still not accurate, the suspicious point can be marked first, and then a measurement can be taken at 25 meters or 500 meters. If the same obvious abnormal value change is observed, it can be determined that the point is an artificial magnetization point. Using the above method, the magnetization point closest to the cut end of the cable can be found, and then the cable can be cut to obtain the zero point position.

[0021] Traditional magnetic mark detection and identification uses a geological compass. When the geological compass moves along the cable direction and encounters a magnetic mark, the compass pointer deflects, thus identifying the magnetic mark. However, due to limitations in both the detection accuracy of the geological compass itself and the operator's experience, there are problems affecting mark identification, such as difficulty in judging multiple suspected magnetic marks and a high misjudgment rate due to insufficient experience of novices.

[0022] This invention uses a Hall sensor that moves at a constant speed above the cable under test. When the multimeter pointer shows a large deflection, it can be determined that the point is an artificially magnetized point. The operation is simple and the judgment is accurate.

Claims

1. A general-purpose device for accurately identifying and detecting artificial magnetic marks on well logging cables, characterized in that: It includes a Hall sensor, a signal processing and amplification unit, an indicator light and a multimeter display unit, as well as a power supply for the Hall sensor and the signal processing and amplification unit. The signal output terminal of the Hall sensor is connected to the input terminal of the signal processing and amplification unit, and the output terminal of the signal processing and amplification unit is connected to the multimeter display unit.

2. The universal logging cable artificial magnetic mark accurate discrimination and detection device according to claim 1, characterized in that: The signal processing and amplification unit includes amplifiers U1A, U1B, and U1C. The signal output terminal of the Hall sensor is connected to the non-inverting input terminal of amplifier U1A via potentiometer RP3. The inverting input terminal and output terminal of amplifier U1A are connected to the inverting input terminal of amplifier U1C via resistor R6, and the other path is connected to the output terminal of amplifier U1C via gain potentiometer RP1. The output terminal of the power supply is connected to the inverting input terminal of amplifier U1B via resistor R2, zero-adjustment potentiometer RP2, and resistor R3, and the other path is connected to the output terminal of amplifier U1B via resistor R4 and then connected to the inverting input terminal of amplifier U1C via resistor R7. The output terminal of amplifier U1C is connected to the multimeter display unit.

3. The universal logging cable artificial magnetic mark accurate discrimination and detection device according to claim 2, characterized in that: The non-inverting input terminal of amplifier U1B is grounded via resistor R5, and the non-inverting input terminal of amplifier U1C is grounded via resistor R8.

4. The universal logging cable artificial magnetic mark accurate discrimination and detection device according to claim 1, characterized in that: The Hall sensor is mounted on the housing of the multimeter display unit.

5. The universal logging cable artificial magnetic mark accurate discrimination and detection device according to claim 1, characterized in that: It also includes indicator lights embedded in the housing of the multimeter display unit, with the power supply providing power to the indicator lights.

6. The universal logging cable artificial magnetic mark accurate discrimination and detection device according to claim 1, characterized in that: The signal processing and amplification unit and the power supply are built into the multimeter display unit.

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