Application of Electromagnetic Flow Meter in Production Logging

Abstract: The application information of electromagnetic flow meter in production logging is provided by excellent flow meter and flow meter manufacturers. 1 The working principle of electromagnetic flowmeter The electromagnetic flowmeter works based on Faraday's electromagnetic induction principle [1], Fig. 1 is the basic working principle diagram of electromagnetic flowmeter. When the conductive fluid flowing through the measuring conduit moves at the flow velocity v to cut the magnetic field line with the magnetic flux density B, as shown in the figure. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the application of electromagnetic flowmeters in production logging. 1 The working principle of electromagnetic flowmeter The electromagnetic flowmeter works based on the principle of Faraday's electromagnetic induction [1]. Figure 1 shows the basic working principle of the electromagnetic flowmeter. When the conductive fluid flowing through the measuring conduit moves with the flow velocity v as the magnetic field line of cutting magnetic flux density B, as shown in Figure 1, the voltage U generated by the induced electromotive force E detected between a pair of detection electrodes can be obtained by the following formula Representation: U=K·B·D·v (1) In the formula, U is the signal voltage between the two detection electrodes, V; B is the magnetic flux density, T; D is the inner diameter of the measuring catheter, m; v is the average flow velocity, m/s; K is the proportionality constant. The instantaneous volume flow Q (m3/h) through the measuring conduit is: Q=(π·D)/(4·K·b)·U (2) Since the inner diameter of the measuring conduit is fixed, when the excitation current is constant, the magnetic flux density B is also constant, so U and Q have a linear relationship, so the volume flow is proportional to the signal voltage between the electrodes, this value is measured and passed through the circuit The conversion yields the volume flow Q. 2 Characteristics of electromagnetic flowmeters Electromagnetic flowmeters are high-precision downhole flow measurement instruments. The flow rate is calculated by measuring the speed of the conductive liquid flow in the pipeline of the instrument probe through internal or external magnetic methods. It has no mechanical moving parts and no throttling parts. , so there is almost no pressure loss in the measurement, with simple operation, good reliability, high measurement accuracy (the measurement accuracy can reach 0.5% relative measurement error, and the accuracy can be higher after special calibration or special manufacturing), small zero drift, It has the characteristics of wide range, small starting displacement and no sand sticking. The measurement results are not affected by the temperature, viscosity, density, pressure and liquid-solid composition ratio of the fluid, and the measurement results will not be affected when the conductivity changes within a large range. . 3 Interpretation method of electromagnetic flowmeter logging data In view of the above characteristics, electromagnetic flowmeter is widely used in oil field oil and water well injection profile measurement or well body leakage, such as a series of logging projects such as water absorption profile, water search, and leak detection measurement [2]. Electromagnetic flowmeter is an instrument that directly measures fluid flow, so the measured flow can be read directly. However, when using the turbine flowmeter to obtain the flow rate, a large number of linear regression and formula calculations are first required, which is cumbersome and has low precision, which brings great difficulty to the interpretation of the data. Calculate the standard deviation by the formula: Δf=fi-fo where Δf is the standard deviation; fi is the measured frequency value; fo is zero frequency. Then the surface flow value can be obtained by looking up the table to obtain the number of words per square: Q=Δf/k In the formula, Q is the surface flow value; Δf is the standard deviation; k is the number of words per square. It can be seen that the electromagnetic flowmeter is used to calculate the fluid flow, the method is simple and the precision is high. Because the electromagnetic flowmeter is measured by full cross-section sampling, that is, each fluid particle passes through the working magnetic field and cuts the magnetic field line to generate an induced current electromotive force, rather than only measuring the flow velocity of a local cross-section, so the accuracy of logging data is greatly improved. It provides a reliable basis for dynamic monitoring of oil and water wells in oil fields. The processing and interpretation of logging data adopts the developed microcomputer version software, which has high reading accuracy, simple operation, accurate calculation and reliable interpretation conclusion. 4 Application example of electromagnetic flowmeter in production logging 4.1 Application in water absorption profile logging The amount of water absorbed can be quantitatively identified“large pore formation”and leakage layer, thus greatly improving the interpretation accuracy of water absorption profile logging data[3]. For example: Figure 2 is the logging diagram of the five-parameter water absorption profile of Well Wen 33-XX. The logging encountered resistance at 2690m, and the 10th, 11th, and 12th layers were not detected, but the electromagnetic flowmeter logging curve showed that these three The barrier layer absorbs water, the absolute water absorption is 74.6m3/d, and the relative water absorption is 41.2%. 4.2 Application in engineering water and leakage detection logging The engineering water-seeking logging series composed of electromagnetic flowmeters has a small start-up displacement and is not affected by well conditions such as well deviation and sand production in the well, and can accurately identify all Primary and secondary water-producing layers, and the quantitative interpretation accuracy of logging data is high. The engineering leak detection logging series composed of electromagnetic flowmeters has high quantitative calculation accuracy of logging data, especially in oil well engineering leak detection logging, which is not affected by the quality of injected water. Multiple leak points, the location of the leak points found is accurate and reliable. 5 Conclusion The electromagnetic flow downhole logging tool not only eliminates the influence of factors such as well deviation, well dirt, and formation pollution in actual logging, but also solves the quantitative interpretation problem of small displacement water absorption and leakage water loss, and also makes The problem of quantitative interpretation of water absorption and spitting in the lower layer of the plug surface and the plug surface is easily solved. The instrument has high measurement accuracy, and the data interpretation method is simple and practical. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Electromagnetic Flow Meter in Production Logging'
To be the best worldwide provider of higher-value level gauge and the center for quality employment opportunities.
During Guangdong Kaidi Energy Technology Co., Ltd.’s existence in a market we didn’t receive any negative feedback from our customers.
level gauge are raising the stakes of social marketing, but they also ease the sales process by providing ways for customized level indicator to effectively interact with customers.
Increasing consumer awareness and rising concern about improving customized level indicator are driving the market of products.
Guangdong Kaidi Energy Technology Co., Ltd. provides a way for you to understand your customers, to learn what makes them unique and what motivates their behavior. We can then leverage that wealth of information to personalize our interactions and demonstrate that level gauge is valuable to our customers.