Simulation Experiments on Characteristics of Ground Gas Gathering Pipe Flow for Foam-Drainage Gas Recovery Technology
Foam-drainage gas recovery technology is widely used in various large gas fields at home and abroad due to its advantages of high economic benefits and convenient construction,and plays a major role in many drainage gas recovery technologies.An experimental simulation device for the characteristics of gas gathering pipe flow of foam-drainage gas recovery technology was designed and processed in order to accurately reveal the flow pattern,pressure drop law and foam stability of gas gathering pipe in foam drainage wells.The reli-ability of the device was verified by using the formation water of gas wells containing polymer as the medium.Using foaming agent UT-5 D in the experiments,the influences of seven factors such as foaming agent concentration,initial temperature,pipe diameter,etc.on flow pattern,resistance characteristics and foam stability of gas-liquid-foam multiphase pipe flow were studied in the range of gas-liquid ratio of 0.55～137.42.The internal relationships between foam height,pressure gradient and various factors were revealed based on the correlation and multiple regression analysis.The results show that with the increase of gas-liquid ratio,there are four flow patterns in the tube:liquid-foam stratified flow,gas-foam slug flow,gas-foam fluctuating flow and gas-foam stratified flow.Gas-liquid ratio,foaming a-gent concentration and tube length have significant effects on pressure gradient and foam height,while other factors have little effect.The influence of various factors on foam height from strong to weak is gas-liquid ratio,foaming agent concentration,pipe length,temperature,elbow,polymer,pipe wall roughness,pipe diameter,and the influence on pressure drop from strong to weak is gas-liquid ratio,foaming a-gent concentration,pipe length,pipe diameter,pipe wall roughness,temperature,elbow,polymer.The foam height and pressure gradient are strongly negatively correlated with gas-liquid ratio.The research results can provide guidance for the parameter optimization of foam drainage gas recovery technology.
foam-drainage gas recoverymultiphase flowflow patternresistance characteristicfoam stability
孙杰、崔淑云、冯永振、张家伟、邓家岳、阎晓雨、KARIMOV Rinat M
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西南石油大学 石油与天然气工程学院,四川 成都 610500
油气消防四川省重点实验室,四川 成都 611731
四川页岩气勘探开发有限责任公司,四川 成都 610056
Department of Transport and Storage of Oil and Gas,Ufa State Petroleum Technological University
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