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New Progress in Gas-Liquid-Solid Multiphase Flow

Author:Admin  Time:2013-9-14 7:34:46

The gas-liquid-solid multi-phase flow in vertical wells was experimentally simulated to study the mechanism and capability of sand-carrying for gas wells with water production, in which the effects of gas/water flow rate, water-gas ratio (WGR) and sand concentration were investigated. Based on experimental results, the critical gas flow rate for sand-carrying and the relationship between the size of sands and gas and water flow rate were obtained. A sand-carrying evaluation model for gas well with and without water production was then developed. The model can be used to predict the critical gas flow rate for sand-carrying with various sand sizes and the maximum sand rate that can be carried by gas at a certain flow rate. A new integrated coordination chart was figured out for the evaluation of sand-carrying capability in gas wells with water and sand production.. The results show that, once the well starts to produce water, it’s sand-carrying capability will be reduced than that when there is no water production. Gas flow rate and WGR are the dominant factors affecting the flow mechanism. As the WGR increases, different flow patterns tends to appear in wellbore in sequence, including mud-gas flow without sand-carrying capability, annular and plug flows with sand–carrying capability, similar to the flow patterns observed in normal gas-liquid two phase flow with the same WGR. The prerequisite for sand-carrying in gas wells with water producing is that high gas flow rate is needed to make or carry water flow at sufficiently high velocity for sands to start moving upward.


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