Application case of natural gas flow meter in Changqing Oilfield

Abstract: The application case information of natural gas flow meter in Changqing Oilfield is provided by excellent flow meter and flow meter manufacturers. Flow is a very important parameter in the industrial production process. In the process of oil and gas field development, flow measurement runs through the entire production process, and flow measurement is inseparable from any link. Flow measurement is also an important basis for enterprise economic accounting, and flow measurement is accurate. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application case article details of natural gas flowmeters in Changqing Oilfield. Flow is a very important parameter in the industrial production process. In the process of oil and gas field development, flow measurement runs through the entire production process, and flow measurement is inseparable from any link. Flow measurement is also an important basis for the economic accounting of enterprises. Accurate and reliable flow measurement is an important means to ensure the best benefits for enterprises and to ensure normal and efficient production. However, flow measurement is an extremely complex technology, and its measurement accuracy is affected by many factors, such as medium physical properties, installation conditions, operating conditions, flow characteristics, and environmental changes. Therefore, a unified method of verifying the accuracy of flow measuring instruments must be established to ensure that the flow instruments meet the requirements of the production process and ensure trade equality. Changqing Oilfield natural gas flow measurement adopts orifice flowmeter, intelligent precession flowmeter, turbine flowmeter, ultrasonic flowmeter, etc. Among them, the internal measurement is mainly based on orifice flowmeter, and the external trade measurement basically adopts multi-channel gas ultrasonic flow. count. The natural gas metering station of Changqing Oilfield Company is responsible for the verification of gas field flowmeters. The verification of orifice flowmeters has always used the geometric verification (verification) method; intelligent precession flowmeters are mostly verified offline by laboratory flow verification devices, using air and low pressure. Natural gas is used as the medium for negative pressure verification; ultrasonic and turbine flowmeters are verified by offline inspection. With the continuous development of real-flow verification technology, Changqing Oilfield has gradually established a complete natural gas real-flow verification system, which has significantly improved the reliability and credibility of the entire measurement system. In 2004, Changqing Oilfield introduced a mobile online real-flow verification device for the first time. In 2008, a fixed online real-flow calibration system was built, which enabled Changqing Oilfield's natural gas measurement system to realize online real-flow verification and calibration. 1 Application of mobile online real flow verification device 1.1 Application background With the continuous expansion of the production scale of Changqing gas field, the number of flow detection instruments in the production process continues to increase. Due to the scattered gas field stations, a mobile verification device is required. At present, the orifice flowmeters that are widely used are susceptible to various influences such as irregular installation pipelines, actual gas flow characteristics, improper pressure-inducing pipelines, orifice plate contamination, etc., and the measurement accuracy is low. The flow verification device was updated. 1.2 Standard table selection gas turbine flowmeter has the characteristics of high measurement accuracy, stable performance, few influencing factors, and wide range ratio; multi-channel gas ultrasonic flowmeter has high accuracy, wide applicable flow range, no wear, and no movement. components, no pressure loss, and low maintenance. Therefore, the 0.5-level high-precision gas ultrasonic flowmeter is selected as the on-site comparison table, and the 0.2-level gas turbine flowmeter is selected as the standard table. 1.3 Verification process and characteristics (see Figure 1) Figure 1 Verification process The verification method is a double standard meter series method, and the two standard meters should be instruments with different working principles. Design a DN250mm inlet pipeline and install a gas ultrasonic flowmeter; design two gas outlet pipelines. According to the situation of the natural gas flow meter in Changqing Gas Field, one is DN300mm and the other is DN100mm, and each gas turbine flowmeter is installed as Standard meter, electric regulating valve is installed behind the meter. The characteristics of this verification method are: (1) Change the T-connection of the original header pipe to the elbow connection. (2) Install a plate flow regulator at 10 times the diameter in front of the meter; a straight pipe section with a length of 20 times the diameter in front of the ultrasonic flowmeter, and a straight pipe section with a length of 15 times the diameter in front of the turbine flowmeter. (3) A flow regulating valve is installed after the outlet pipe table, and an online full-component analyzer is installed behind the inlet pipe table. (4) Skid-mounted integration and vehicle calibration (CEESI, Colorado Engineering Laboratory, issued a test document for real-flow verification). 1.4 Total Uncertainty of Technical Specifications: When manufacturing is completed without any correction to the entire set of devices≤0.6%, after calibration correction≤0.5%. Working condition flow range: 50～5000m3/h. Design pressure: 6.3MPa; working pressure: 4.0～6.0MPa. The pressure loss of the whole set of devices: not more than 4% of the working pressure. Figure 2 Overall schematic diagram of the verification device 3 Fixed verification process The parallel design specifications of the inspection meter ports in the fixed verification area are DN300, DN250, DN200, DN150mm, and the fixed inspection ultrasonic flowmeter is installed on the DN300mm pipeline. Under normal gas supply conditions, it can realize the serial connection of all the ultrasonic flowmeters for external trade measurement in the purification plant and the DN300mm verification flowmeter, so as to realize the flow verification of the inspected flowmeter. Other tested flowmeters of DN250, DN200, and DN150mm can be installed on the meter inspection port, so as to be connected in series with the mobile online real-flow verification device, so that the real-flow verification of any of the flowmeters can be carried out.

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