Double-parameter measurement method of wet gas in phase-isolation state
Natural gas,a green,low-carbon and environmentally friendly energy source,is experiencing rapid growth and high-quality development due to energy transformation.At present,the system structure of natural gas industry is continuously evolving.However,traditional natural gas flowmeters struggle to meet the current requirements for measurement accuracy and real-time performance.The presence of liquid phase components in wet natural gas can distort measurement results,significantly increasing the complexity and cost of wet gas measurement.Therefore,there is an urgent need for an accurate,convenient and efficient online measurement method.This study aims to explore a dual-parameter method for measuring wet gas flow.A vane cyclone was employed to convert hard to measure liquid droplets or stratified manifold into a phase-isolation state of gas column and liquid ring.This process mitigates the influence of flow pattern on experiment error.By using a Venturi tube to measure two parameters:axial pressure difference and radial pressure difference,leading to the development of a dual-parameter wet gas measurement method.Taking into account factors such as phase distribution,pressure field,velocity field and other conditions related to high pressure closed gas transportation,a multi-factor correlation measurement model with strong applicability was established.This model was tested and calibrated in the field using the wet gas experimental platform at TH Oilfield.The results were good,with error margins of±5%and±9%for gas phase and liquid phase mass flow.
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