Least Ability of Lifting by Sand-carrying in Gudong Oilfield

With the help of an experiment of sand particle settling in fluid (water and oil), the law of sand particle moving in flow fluid is studied,a correlated relational expression between the particle settling velocity and mean velocity of wellbore fluid is established,a design method is proposed for optimizing operational parameters in sucker rod pumping well under sand carrying production condition and a corollary application software is developed Field application of the technique is carried out in 50 wells, with 81 0% of accuracy and 7 3% increase of average pumping efficiency; optimal sand carrying ability increases evidently A better prediction for the particle settling rate and height of sand column is conducted with the technique during the production,which provides the bases for tubing string designing, parameter optimizing,safety shut in and determining the period of pump inspection in Gudong oilfield