Study On Mechanism Of Gas-liquid-solid Flow And Liquid-carrying Capacity And Sand-carrying Capacity Of Gas Well

Parts of the gas wells at home and abroad have the phenomenon of sanding. Conventionalsandcontrol method is not completely effective to avoid sanding, there is always some sandcoming into the wellbore with the gas. If the gas is not able to carry the formation sand to thewellhead, the formation sand may accumulate in the bottom of the well, eventually leading tothe sandblock. Parts of the gas wells at the same time have the phenomenon of producingwater, if the situation is not handled with properly,it will lead to water logging,so the thesisfocuses on the gas-water-sand three-phase flow and liquid-carrying capacity sand-carryingcapacity of the wellbore.The wellbore gas-water-sand three-phase flow pattern and pressure drop was analyzed, andthe pressure vibration energy and gas slurry flow rate is considered as the division of the flowpattern：bubble flow、slug flow、transition flow、annular flow.The actual situation of the Sebei gas field is taken into account, water encroachment andsanding exists at the same time and a new sand-carrying model is established on the basisof the available model, and analysis on the influence of the elements such as the size of thesand and the gas-liquid ratio is also done.A new liquid-carrying model is established on the basis of the existing models, the lowestenergy theoretical model and calculate thecritical liquid carrying flow rate of gas wells on thebasis of MinLi model in order to predict when the gas wells will produce effusion, when theeffusion exsists,a method is used to calculate the depth of the effusion.Experiment is done in order to study on the influencing factors of gas-liquid and gas-sandtwo-phase flow, the phenomenon of the sand suspension and gas-water two-phase flowpatterns will more intuitively reflects different factors on the process of liquid-carrying andsand-carrying.The experiments of gas-water-sand three-phase flow are also done, during theexperiment,the research is done on the interact influence of the liquid-carrying and sand-carryying...