Table of Content

20 January 2022, Volume 58 Issue 1

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Instrument and Meter

Difference of Temperature-Pressure Compensation Formula to Gas Flowrate

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Research and application of digital water cut analysis device for wellhead crude oil

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In view of the fact that the traditional manual determination is still used for crude oil content analysis in the wellhead sampling of Changqing Oilfield. This method takes a long time for sampling and testing, has high labor intensity, consumes a lot of manpower and material resources, and is easy to cause liquid splashing at the sampling port, resulting in wellhead environmental pollution, the digital water cut analysis device of wellhead raw oil is studied, The composition and method of digital water cut analysis device for wellhead crude oil are introduced. More than 30 sets have been applied at the wellhead. The water content analysis of wellhead crude oil is 100 times faster than the traditional test method, which greatly saves human resources, gasoline and other test consumables. It can digitally and real-time monitor the water content of wellhead crude oil, simplify the complexity, facilitate the rapid management of oil production and prevent environmental pollution, and has achieved obvious social and economic benefits.

Application of intelligent multipoint thermometer in reservoir area security

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The intelligent multi-point average thermometer is different from the traditional mean thermometer. The multi-point average thermometer must measure the average value measured at multiple positions or positions at the same time, but the intelligent multi-point average thermometer can judge the liquid position more automatically, and output the average value of the temperature probe in the liquid, and measure the average value measured at multiple positions or positions, The liquid position is automatically determined and the average value of the temperature probe in the liquid is output, which is not affected by the temperature difference between the liquid and the air in the tank. Thus, the probability of false alarm is greatly reduced

Innovation and Practice

Technology Analysis of Photovoltaic Power Generation in High Speed Green Highway

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Discussion on Transmission Distance of Vibration Signal of Eddy Current Sensor

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Compressor is widely used in the field of petrochemical engineering. The on-line monitoring of shaft vibration relies on eddy current sensor. When vibration signals are transmitted over long distances, their reliability is limited by cable length. However, there is no clear theoretical basis for the relationship between cable length and sensor reliability at present, which leads to many problems in the field. Based on the above engineering practice, this paper discusses the two main factors affecting the cable length, signal attenuation and explosion-proof requirements, from the working principle of eddy current sensor, and proves the influence of the target cable length on the reliability of the sensor through the intrinsically safe circuit verification. The conclusion of this paper provides theoretical basis and practical reference for the judgment of vibration signal transmission distance.

Passive fire protection design and implementation of emergency shutdown valve for offshore oil and gas production facilities

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as an important guarantee to prevent and avoid major safety accidents of offshore oil and gas production facilities, passive fire protection design has been paid more and more attention in the design of safety protection of facilities. In view of the important role of emergency shutdown valve in offshore oil and gas production process, this paper discusses the passive fire protection design and implementation scheme of emergency shutdown valve, including the purpose of passive fire protection, realization method, basic functional requirements, standard system, etc., and summarizes the technical points of functional design, and implementation stages of the fire jacket of emergency shutdown valve.

In-depth Optimization Method for Light Source of H2S Online Analyzer

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Abstract: The light source of Ametek Model 933 H2S analyzer has a short lifespan and needs to be replaced frequently for its low efficiency, which leads to unstable operation of the analyzer and thus a plant shutdown or ineffective production. In order to overcome these shortcomings and ensure a stable operation of the analyzer, the Paper introduces the principle of light source system and an in-depth optimization method for it so as to achieve smooth production and higher economic performance of the plant.

Process and Technology

Application of VMD-MPE-WT combined denoising algorithm in oil and gas pipeline leakage acoustic signal

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Abstract: In order to solve the problem that the leakage sound signal will be mixed with noise during the propagation process of oil and gas pipeline leakage, the variational mode decomposition (VMD) in the pipeline leakage denoising application, proposed a multi-scale permutation entropy (MPE) and wavelet threshold denoising (WT) combined VMD-MPE-WT denoising algorithm. The Matlab software is used to simulate and analyze the signal processing results. The results show that compared with wavelet denoising, VMD denoising and VMD-WT denoising, this joint denoising algorithm can get higher signal-to-noise ratio and smaller mean square error in the leaked sound signal under strong noise, and the denoising effect is better.

Path optimization model and simulation in gasoline refining process

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Clean gasoline is of great significance to energy conservation and emission reduction in the transportation sector. Therefore, it is urgent for China to study gasoline cleaning technology to cope with the environmental burden brought by the increasing number of motor vehicles. The key to clean gasoline is to reduce the sulfur and olefin content in gasoline while keeping its octane number as much as possible. Based on the measured data of industrial production of gasoline products, this paper explores the improvement path of gasoline cleaner process from multiple perspectives such as data mining and operation optimization. First of all, this paper preprocesses the original data and sample data to ensure the quality of subsequent models. Secondly, in order to reduce the complexity of the model, the main variables of the prediction model are screened out through the gradient descent regression tree. Thirdly, considering the highly nonlinear and strongly coupled relationship between operating variables, BP neural network is used to establish the prediction models of main variables on octane loss and product sulfur content respectively. Finally, a two-stage optimization model of operation optimization of major variables is established, and the effect of gradual adjustment of operation variables is visualized to provide reference for industrial production.

Optimal Control of Backwashing Process in 1.2 Mt/a Diesel Hydro-upgrading Unit

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Aiming at the problem that the fluctuation of raw material buffer column level in the back-flushing process of 1.2 Mt/a diesel hydro-upgrading unit of a company affects the whole loop, this paper uses linear active disturbance rejection controller (LADRC) to make the fluctuation of raw material buffer column level smaller, and has faster tracking ability and stronger disturbance rejection ability. The application of LADRC improves the control performance of the back-flushing process, and makes the whole device work more smoothly.

Optimization of Production Process Parameters Based on The Digital Twin Principle

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With the in-depth development of the digital transformation of traditional enterprises, the concept of digital twin has emerged and is widely applied in the field of intelligent manufacturing. This paper aims to exploit the digital twin principle to optimize production process parameters, i.e., to reduce the exhaust gas emissions from direct-fired thermal oxidizer in a refining & chemical plant. First, based on the historical production data, a digital twin model of physical equipment is established through stepwise regression, multiple linear regression, and monotonicity analysis algorithms. Second, according to the real-time production data, the above-mentioned model is used to calculate the optimal parameters. Finally, the calculated parameters are returned to the equipment in real time through the system interfaces. The results show that the exhausts can be effectively reduced by this method while the energy consumption of the equipment is basically unchanged, with the purpose of production optimization achieved.

Research on Obstacle Surmounting Performance of Crawler Robot Based on ADAMS and MATLAB

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In order to improve the ability of the tracked oil storage tank cleaning robot to pass through the obstacle, an active damping suspension device is designed between the robot body and the wheel body. The influence of active damping control on the obstacle performance of the robot is studied, and the related theoretical analysis is carried out. Finally, taking the active damping as the control object, the robot is simulated and analyzed by MATLAB and ADAMS. It is verified by simulation analysis that the active adjustment system damping can improve the stability of obstacles such as anode blocks, which further shows that the application of control theory has broad application prospects for improving the obstacles of robot climbing.

Discussion on interlock circuit setting of natural gas purification plant

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Safety and Environment Protection

Discussion on Security Protection Technology for Oil and Gas Stations

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With the rapid development of long-distance pipelines in China, the state attaches great importance to the security protection of oil and gas stations. The current standards require oil and gas stations to set up security protection technology, but no specific selection principle is given. The paper introduces the development trend of security protection technology in oil and gas stations at home and abroad, including the practice of preventing large animals from entering oil and gas stations in Russia. Vibration optical fiber, vibration cable, infrared radiation, laser radiation and microwave radiation technology are mainly used in China pipeline industry. The safety, monitoring range, sensitivity and reliability of various security protection technologies are expounded. The selection principle of security protection technology for new oil and gas stations is proposed, according to the environmental characteristics and protection requirements of the stations, considering the performance index, economic cost and maintainability factors, the intrinsic safety protection technology is preferred, and the reliability of climate environment and intelligent identification ability are further improved.

Common problems in SIL verification of in-service factory

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Analyze the reasons for the slow progress of SIL verification project; Introduces the determination methods of SIL verification in several special cases; Introduces the drawing of two voting structures: deviation oriented and subsequent result oriented; The practical problems and solutions encountered in collecting equipment failure data are introduced; Several situations in PFDavg calculation are introduced; Summarize the common safety management problems found in the chemical industry through SIL verification.

Engineering Design and Standards

PFDAVG calculation and key parameters setting in SIL Verification Technology

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Through the concept of SIL, the key parameters of PFDAVG calculation of safety instrumented system are explained; At the same time, the methods and procedure of proof test are described. It is hoped to improve the accuracy and effectiveness of SIL verification, so as to improve the safe operation of the process.

A Markov Degenerate Modeling and Simplified Calculation Method for KooN Structure

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In the chemical industry, the reliability and availability of safety instrumented systems (SIS) are the focus of attention. Several methods for calculating the average probability of failure on demand（PFDavg）of SIS are proposed in functional safety standards like IEC61508. Among these methods, Markov method covers many safety-related factors, such as failure mode, proof test, restorations, and common cause. The analysis model is more flexible and the calculation results are more accurate. However, for KooN, a complex system with redundant configuration, with the increase in the number of components, the number of intermediate states of the system increases rapidly, so it is difficult for users to build Markov models. Even with the help of computers, modeling and operation are time-consuming. In this paper, a Markov modeling method of degenerate state is proposed. Firstly, the degraded state is judged, and the intermediate state that meets the conditions is merged. And then, the state transition probability marked as dangerous failure is calculated. The example shows that the degenerate state method can simplify the Markov modeling without loss of accuracy.

Intelligentization and Information Technology

Diagnosis Method of Indicator Diagram Based on Transfer Learning

2022, 58(1):  0-0. 

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The indicator diagram is important for digital analysis of the operating conditions of the pumping unit. Different shapes of indicator diagrams represent different operating conditions. Traditional analysis programs analyze indicator diagrams based on expert systems or statistical learning methods, which require a large amount of expert knowledge and are less robust. From the perspective of deep learning, this paper proposes an indicator diagram detection method based on deep convolutional neural networks, and the number of samples required for model convergence is greatly reduced through transfer learning,. Experiments show that this method can effectively improve the accuracy of the indicator diagram classification and meet the needs of industrial scenes.

Design and implementation of fracturing engineering information system

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Focusing on efficient exploration and development and intelligent oil and gas field construction, the fracturing engineering information system construction will be carried out, data fusion and connection will be promoted, and the current fracturing production management and technical innovation mode will be improved. Starting with the key construction points of platform sharing, data quality and security management, the solutions, innovative achievements and promotion and application are mainly introduced. Provide reference for digital application of fracturing production.