Aiming at the problem that the measurement value of the nozzle flow standard device of the natural gas verification station is too large due to the wall fouling, the influence law of the wall roughness on the nozzle outflow coefficient is studied from the two aspects of theoretical deduction and CFD simulation. The influence law is consistent with reality, and the data monitoring and nozzle cleaning scheme to ensure the accurate measurement of the nozzle flow standard device is proposed, which has a certain guiding effect on the natural gas verification station with the nozzle flow standard device.

This paper is intended to conduct a preliminary exploration of the application of Venturi + Exemption Source three-phase metering in the multiphase flow conditions of oil wells. Firstly, the commonly used measurement methods for multiphase flow in oil wells, the current status of three-phase flow measurement, and the current status of production calculation based on the dynamometer card are introduced. Then, the difficulties in multiphase flow measurement are discussed, and the principle of three-phase metering, including its application in the multiphase flow conditions of oil wells, is elaborated in detail. In the data analysis part, the data of three-phase metering in a certain pipeline area is processed and interpreted, and the 24-hour three-phase metering data is used to verify the regularity summary. Finally, the conclusion is summarized based on the research results.

The calorific value of natural gas is one of the important gas quality parameters that need to be strictly controlled during trade handover. According the standard, the A-level station is equipped with a gas chromatograph for indirect calculation of the calorific value, and the problem of calorific value measurement of natural in other stations needs to be further studied. This paper is based on simulation technology, firstly the pipeline network topology is modeled; then the characteristic parameters of the compressor are, and the fitting results are brought into the pipeline network simulation model; finally the calorific value assignment is completed by using the simulation model. The following conclusions are obtained ① The pipeline network simulation can be used for calorific value assignment, and the calorific value assignment error within a single day is -0.11%;② After using the actual head H-flow Q curve of the compressor as the input boundary condition, the hydraulic calculation error is only 0.45%; ③ smaller the fluctuation of the calorific value in the region, the higher the accuracy of the assignment. In summary, simulation technology can be applied to the assignment of gas calorific value.

Oil and gas measurement has always been a key contentt of oil and gas development projects. Crude oil field measurement continuously strives for refined management in oilfield development and production. In crucial production processes such as well measurement, water content of crude oil measurement, and refined oil measurement, efforts are made to continuously improve automated measurement methods for crude oil fields. Research and development focus on verifying intelligent instruments suitable for different physical properties and operating conditions across various oilfields. Additionally, there is an emphasis on strengthening the construction and technological enhancement of the measurement instrument traceability system to ensure the accuracy and reliability of production measurement . This provides technical support for driving the digital and intelligent transformation of oilfields.

The multi-arm caliper has a high measuring accuracy (±1mm), which plays an important role in the detection of downhole pipe string damage. There are many factors that affect the accuracy of multi-arm borehole diameter measurement, such as scale formation,high viscosityfluid,casing deformation structure,temperature correction, human operation,etc. From the analysis of many influencing factors, temperature,measuring arm wear,field calibration situation or the instrument and temperature file inconsistency are the main reasons affecting the measurement accuracy. This paper analyzes the accuracy calculation method of the multi-arm instrument, deeply analyzes the relationship between temperature supplement and field scale on the multi-arm measurement accuracy, carries out the analysis of the influence of low temperature and scale on the measured value, and finally puts forward the field test guidance to guide the field construction and improve the quality control of the field multi-arm test data.

The caliper curve is an important engineering quality curve in petroleum logging, and the calibration accuracy of the caliper gauge, as an important tool for calibrating the caliper instrument, directly affects the accuracy of logging data. The traditional calibration method for wellbore calipers has low accuracy and slow efficiency, so,a calibration method for wellbore calipers based on blue light ranging technology has been proposed. By designing a dedicated calibration device, automatic measurement and batch detection of wellbore calipers can be achieved, and calibration certificates that meet industry standards can be issued, ultimately achieving the goal of accurate calibration of wellbore calipers. This article elaborates on the design principle, implementation steps, and experimental verification results of the new calibration method, and looks forward to the application prospects of this technology in the petroleum logging industry.

Abstract: As a green energy, LNG is imported and used in power generation and gas in China. With the continuous construction of domestic LNG terminal stations, the demand for LNG import is increasing. Domestic LNG importers sign trade contracts with global different gas sources, and the measurement clause used by worldwide gas sources or domestic importers are also different. Since LNG imports are based on energy measurement as the basis of trade handover, there are many quoted data and variables in the measurement, even small changes will lead to different measurement results. The author works for Guangdong Dapeng LNG Co., LTD., the first LNG import company in China, which is also the LNG unloading station with the highest turnover rate at present. The author contacts with LNG from various gas sources and different measurement contracts. In order to explore the scientific method of LNG trade handover measurement. This paper aims to explore the scientific measurement method of LNG trade transfer measurement by studying different measurement clauses and the calculation of returned BOG.

This paper proposes a new method for the deviation calibration of petroleum thread gauges based on 3D measurement point clouds, aiming to address the issue that traditional calibration methods cannot comprehensively reflect the deviations that may occur during the use of the gauges. The new method employs high-precision 3D scanning equipment to capture the geometric information of the thread gauges comprehensively, and optimizes the point cloud data quality through specific data processing techniques. After accurately extracting key feature parameters, deviation analysis is conducted, and the gauges are calibrated precisely based on the analysis results. This method effectively improves the calibration accuracy of petroleum thread gauges and is of great significance for enhancing the quality and safety of threaded connection components in the petroleum industry.

Based on the requirement of the national standard GB/T32065“Environmental test methods for oceanographic instruments—Part 1: General”, this paper analyses the test items should be carried out during subsea electric module(SEM) testing, sets the test conditions,designs the test procedure and carries out testing aiming at the key test items, and obtains the test results. And the application recommendations are put forward according to the test results, which lays a technical foundation for the SEM test procedures development.

The popularization and application of wet gas non-separation measurement technology is of great significance to reduce the investment and operation cost of oil and gas fields, improve the production efficiency and scientific management level of oil and gas fields. Compared with the traditional separation metering technology, the wet gas non-separation metering technology can greatly simplify the natural gas wellhead process , and it is estimated that the overall wellhead construction cost can be reduced by 10% to 30%, which has significant advantages in technical economy and operation management. With the development of unconventional natural gas such as shale gas and tight gas in recent years, the demand for wet gas measurement technology has been greatly developed in recent years. A variety of wet gas flowmeters with different measurement principles have appeared, and small-scale industrial applications have begun in oil and gas field production site. In this paper, more than 40 sets of wet gas flowmeters used in a gas field block are statistically analyzed, and the application of existing wet gas flowmeters in the field is studied, which provides a reference for the optimization of wet gas measurement scheme and the development of measurement technology.

The primary standard device for high-pressure piston prover at Wuhan substation can directly reproduce the volume flow rate of natural gas by measuring the time of piston movement in the prover and the volume of the prover. However, long-term use can cause the piston seal to gradually fail, resulting in natural gas leakage during piston movement and prolonged movement time that affects measurement results. This article analyzes the working principle of the primary standard device for high-pressure piston prover, and conducts experiments on measuring the leakage of the prover using Venturi nozzles. The calculation method for selecting nozzles for the experiment is also provided. Finally, on-site experiments were conducted using negative pressure air drive and positive pressure natural gas drive to verify the feasibility of the experimental methods.

Under the macro background of global energy market integration, although energy measurement methods are widely adopted internationally, domestic trade still relies on volumetric measurement, highlighting the urgent need to shift the measurement approach. An online heat value tracking technology combining deep learning neural networks and mechanism model has been proposed. A self-developed and compiled online heat value tracking system for natural gas has been established, which accurately detects real-time pipeline data and outputs key parameters such as natural gas composition and heat value through the integration of mechanistic models and big data models. The system has been deployed at long-distance pipeline metering stations, where, based on the system's online calculation results, real-time verification using online gas chromatographs is possible at stations equipped with such instruments. For stations without online gas chromatographs, the system enables parameter assignment. This provides strong support for the promotion and implementation of energy measurement in complex long-distance natural gas pipeline networks.

The inclinometer calibration device is a critical piece of specialized testing equipment used in petroleum drilling, well logging, as well as scientific research and production. Its metrological performance directly impacts the accuracy of inclination and azimuth measurements. This paper examines the limitations of existing calibration methods for inclinometer calibration devices in the petroleum industry and introduces a high-precision optical calibration method to improve the calibration of inclination and azimuth measurements. The calibration principles and methodology are detailed, and a mathematical model is established to support the approach. Furthermore, an uncertainty analysis is conducted to evaluate and validate the calibration results. The proposed high-precision optical calibration method enables comprehensive measurement across the entire circumferential angle range. Results demonstrate that this method significantly reduces measurement errors and enhances overall measurement accuracy.

In order to reduce personnel and environmental exposure caused by the presence of radioactive sources in the calibrator during the transmission of natural gamma values, avoid complex processes during the use of natural gamma calibrator, reduce the weight of natural gamma calibrator, and increase their adaptability, a kind of lightweight and environmentally friendly natural gamma calibrator has been developed by replacing the traditional natural gamma calibrator， it has a unique packaging shape. This kind of calibrator has the characteristics of material exemption, lightweight and easy to carry, convenient operation, and strong adaptability, which is conducive to the standardization of natural gamma calibration.

The critical flow Venturi nozzle gas flow standard device is a crucial apparatus for ensuring the calibration accuracy of flow meters. Improving its uncertainty level is essential for enhancing the precision of the entire metering system. This study focuses on optimizing the pressure measurement method within the critical flow Venturi nozzle gas flow standard device. Specifically, the traditional single absolute pressure measurement method is replaced with a combined "absolute pressure + differential pressure" measurement approach, effectively reducing the uncertainty component introduced by pressure factors. The research results demonstrate that this optimization significantly improves the overall uncertainty level of the device, providing more accurate and reliable technical support for natural gas metering.

Flowmeter is the key metering equipment of hydrogen dispenser, generally using Coriolis mass flowmeter. After investigation, it is found that the flowmeter used in hydrogen refueling station has some problems such as low mass flow measurement accuracy, single function, no density measurement, or low density measurement accuracy. To solve the above problems, a Coriolis mass flowmeter is developed, which is mainly used in 35MPa hydrogen dispenser. By improving the sensor structure, optimizing the digital transmitter algorithm, adding self-diagnosis, self-calibration functions, adding high-precision density measurement functions, improving the metering accuracy, stability and intelligent level of the flow meter. After calibration by legal measurement technical institutions and field test, the measurement accuracy in hydrogen environment can reach ±0.35%, which is ahead of most similar products on the market. Key words: Coriolis mass flowmeter; Hydrogenator; High precision; intelligentize

Closed loop technique does not rely on upstream and downstream pipeline conditions, whose calibration pressure can be switched flexibly, has become the trend of development in flow measurement field. The equipment lectotype and design specifications of steady-state system of natural gas closed loop are discussed, the data model is built and the temperature and pressure changes during the verification process are simulated. The results show that the pressure deviation is within 0.2% at the pressure of 5.0 MPa and flow rate of 3200 m3/h during the verification. When the calibration pressure is 5.0 MPa, during the process of reaching a flow rate of 3200 m3/h in the closed loop, the temperature tended to stabilize within 16 minutes, and the temperature change can be controlled within the range of ±0.2℃ during the calibration. Magnetic coupling blower with external motor has significant advantages, which is the development direction of future close loop verification technology.

： Many refining and chemical enterprises have established dynamic automatic rail scales for daily trade settlement and measurement comparison, with a calibration cycle of generally one year. During period between two calibrations, in order to ensure the accuracy of the daily measurements of the dynamic rail scale, we can use the method of online calibration of automatic rail scale to verify the accuracy of the dynamic rail scale. This helps to avoid the instability of the scale's measurement performance due to fluctuations in sensors, signal failures, etc., which can affect the accuracy of the measurement results. This ensures that the scale is used normally within its life cycle and that its values are accurate reliable.

In order to achieve online measurement of the inner diameter of large aspect ratio holes, a high-precision diameter measurement system has been developed. The system employs a self-calibration comparative measurement method. Two displacement sensors on the rotating arm rotate once at a certain step angle, and the resulting displacement data is fitted to a circle using the least squares method to obtain the measured diameter. Using the developed diameter measurement system, field measurement experiments were conducted on a volume tube with an inner diameter of 250mm and length of 6m. The diameter distribution along the axis of the volume tube was obtained, and its integral average value was taken as the diameter measurement result. Experimental results and uncertainty analysis indicate that the diameter measurement uncertainty is 6μm.

In 2024, Tianjin Petrochemical successfully carried out the development and application of domestic intelligent data acquisition system, and realized the intelligent improvement of data acquisition, measurement statistics, instrument operation and other measurement work. The instrument bus and network architecture are optimized, and the problem of poor stability of original data acquisition is solved. The new generation of intelligent data acquisition system platform is constructed through Internet technology, and the all-round, whole process and three-dimensional control and application of measurement business are strengthened, which greatly shortens the working cycle, improves the efficiency of production information transmission and work efficiency, effectively reduces the operating cost, and has a good application prospect.

"Digital China" is a strategic emerging industrial development direction supported by our country, and China will focus on the development of industrial Internet during the 14th Five-Year Plan. For many years, in the aspects of measurement work, one refinery enterprise has been combining with practice and insisting on the new measurement control mode based on the united statistic caliber, the same reported data, the integration of data and equipment and the integration of management and operations. Through continuous efforts, the enterprise has built an integrated intelligent measurement data system, which has realized automatically collecting various energy, materials and trade measurement data in production, monitoring in real time the operation trends of measurement equipment, and automatically producing reports of various measurement data. By means of the System, we have basically achieved the goals of saving costs, strengthening operational security, making integrated development easy and significantly improving economic returns. This paper elaborates the System creation plan and framework.

At present, a certain petrochemical enterprise adopts mass flow as the mainstream flow measurement instrument. However, changes in the installation method, process operation, and environmental conditions of the flowmeter will have a certain impact on the accurate measurement and normal operation of the mass flowmeter, and the resulting metering disputes will directly affect the economic and social benefits of the enterprise. Due to the lack of technical support for the operation status and fault remote diagnosis platform of the metering instrument, a large number of personnel are required for daily inspection and maintenance, the workload is large, and the timeliness of fault detection and handling response cannot be guaranteed. In order to solve the above problems, this paper expounds an innovation and development plan for the localization of an online monitoring system for flowmeters based on intelligent monitoring technology.

Under the traditional measurement mode, the enterprise measurement information system has not been developed on a platform, resulting in information silos, insufficient application of intelligent technology, and inability to achieve early warning and analysis of the impact of process operations, environmental conditions, and equipment operation on measurement data. Measurement business cannot be fully integrated, and there are generally problems such as scattered management of measurement data processes, untimely tracking of measurement equipment operation status, weak timeliness of data collection and application, and difficulty in preventing measurement risks. In this context, the use of new generation information technology to develop and build a measurement cloud platform, innovate measurement models, and achieve integrated remote "cloud" control of business cloud operation, equipment cloud inspection, and fault cloud diagnosis is of great significance for strengthening the comprehensive, full process, and three-dimensional control of enterprise measurement business, building green, intelligent, efficient, and harmonious measurement, realizing the digital transformation of measurement management, promoting high-quality development and digital transformation of enterprises.

With the development of digitization and intelligence, the disadvantages of traditional measurement management mode are becoming increasingly prominent, to some extent which affects the production efficiency, operational stability, and production costs of enterprises; This article starts from the problems of traditional measurement management mode, elaborates on the Mathematical-intellectualization transformation of measurement management mode based on Hart, introduces the system architecture, principles and functions, and elaborates on the content of management system construction, selection of solutions and other practical content, as well as the achievements achieved

Starting from the measurement principle,installation,and use of the double-flange liquid level transmitter,this article discusses in detail the on-site installation,commissioning,and precautions of the double-flange liquid level transmitter.It focuses on the precautions for on-site installation of the double-flange liquid level transmitter,as well as how to set internal parameters and conduct on-site commissioning after installation.

Abstract: With the growing global concern over climate change, carbon emissions control on offshore oil platforms has become an important issue. This paper discusses the current carbon measurement technology used in offshore oil platforms. This includes the basic methods and technologies of carbon emission measurement, the operational characteristics and carbon emission sources of offshore oil platforms, and looking forward to the development direction of carbon emission measurement, monitoring, and management technology in offshore oil exploration and production processes.

Daily propane exists in both gas and liquid phases in oil tanks. In order to accurately measure the mass of propane in oil tanks, it is necessary to measure the mass of propane in both gas and liquid phases simultaneously. Due to the lack of clear regulations on the calculation method in relevant national industry standards, a propane gas phase calculation method is proposed based on the liquefied petroleum gas calculation method currently used in the petrochemical product market for everyone to learn and explore together.

Abstract: Accurate calibration of neutron lifetime logging instruments is crucial for reliable data acquisition. This paper focuses on the precise determination of the macroscopic neutron capture cross-section (∑) of standard reference materials used in calibration wells. We provide a detailed analysis of calibration methodologies, including the selection of experimental parameters, appropriate testing methods, statistical processing of calibration data, and the calculation of ∑. This work establishes a robust framework for the calibration, analysis, and traceability of standard calibration wells, ultimately enhancing the accuracy and comparability of neutron lifetime logging measurements across different instruments and facilities.

The comparison check of mass flowmeters is a commonly used technical means in petroleum product measurement management. Its core lies in the horizontal comparison of measurement results between mass flowmeters and other measuring instruments or different flowmeters to ensure accurate measurement of pipeline petroleum products in the same batch. By performing comparison check operations, it is possible to evaluate and ensure the performance of mass flowmeters in terms of measurement accuracy, data consistency, and compliance with measurement requirements.

Reducers play an important role in cementing low-density cement slurry. The quality of these materials has a great influence on cementing quality, and strict quality inspection is one of the important factors to improve cementing quality.density as the main indicator of reducers, it is very important for the detection accuracy,In the current inspection standards, there are some problems with the density measurement method for reducers with a density less than 1.0 g/cm3. The method is difficult to operate and has a low accuracy rate, which is not conducive to the control of product quality. Through research, the method of measuring the density of such products using Lee's density bottle has been improved. Two types of stoppers have been designed, one is a filter mesh stopper and the other is a sponge stopper, which effectively improves the accuracy rate of the density measurement of these reducers and plays an important role in the control of material quality.