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为了研究未固结流砂储集层在采油过程中的出砂情况和影响出砂的主要因素,进行了不同条件下的出砂过程模拟实验。使用水洗白砂、黏土(高岭土)和蒸馏水制成未固结流砂地层模型,利用新开发的出砂模拟装置进行了模拟实验,并分析了作用于地层的拖曳力和地层胶结特征对出砂的影响。研究表明,随着拖曳力的增加,出砂速度和产油速度都加快;随着胶结物含量的增加,出砂量和产油量明显降低,甚至在胶结物含量较高的情况下出砂量几乎为零。地层压力大的油藏在开采期间由于产生了较大的拖曳力更可能出砂,而拖曳力和有效地层应力共同影响油藏的总体产油量。可以根据地层黏土含量估计出砂情况,从而通过采取适当的防砂措施尽可能减少出砂量。某些情况下油藏比气藏更容易出砂。
In order to study the situation of sand production in unconsolidated sand reservoirs and the main factors affecting the sand production, simulations of sand production under different conditions were carried out. Unconsolidated sands stratum model was made by using washed white sand, clay (kaolin) and distilled water. The simulation experiment was carried out by newly developed sanding simulation device. The influence of drag force and formation cementation on sand production was analyzed . The results show that with the increase of the drag force, both the sand production rate and the oil production rate are accelerated. With the increase of the cement content, the amount of sand production and oil yield are significantly reduced, even in the case of high cement content sand The amount is almost zero. Reservoirs with high formation pressure are more likely to sands during the mining period due to greater drag force, and drag force and effective formation stress jointly affect the overall reservoir oil production. Sand production can be estimated from the clay content of the formation to minimize sand production by taking appropriate sand control measures. In some cases, reservoirs are more likely to sands than gas reservoirs.