天然气井连续携液液滴曳力系数研究

Research on The Liquid Droplet’s Drag Coefficient for Continuous Removal of Liquid from Gas Well

我国大多数气井均属于产水气井,地层产出的液体在井筒中主要以小液滴的形态存在,其主要受力为曳力、浮力和重力。曳力的大小用液滴曳力系数表示,因而该系数是代表天然气井连续携液能力的关键参数。如何定量计算每口井的液滴曳力系数关系到对气井临界携液量的准确计算,而学术界对于该系数的确定和计算有着不同的认识。文章对液滴曳力系数的计算公式进行了对比优选,并以实际气井作为研究对象计算其在不同条件下的液滴曳力系数值,从而得到有关的规律性认识。

The great number of natural gas well produces water in China, the conformation of liquid produced in the reservoirs is mainly droplet in the wellhore, the force of those droplets are drag and buoyancy as well as gravity. The number of drag can be expressed by droplet drag coefficient, so the coefficient is the key parameters which represent continuous throughput liquid capacity of natural gas well. How to calculate that coefficient is very important for calculating exactly the capacity of the critical throughput liquid of natural gas well. Different researchers had the different ideas calculating that coefficient. By comparing and optimizing some formulas calculating that coefficient and aiming at one real gas well , this paper calculates the coefficient of different conditions of that gas well, and gets some concerned regular information.