论文部分内容阅读
疏松砂岩地层出砂的危害极大,出砂临界流量的准确确定尤为重要。利用自行研制的出砂模拟试验装置,对青海油田N21储层进行了不同流体和覆压下的小岩心出砂模拟试验。结果表明:由不同压差的流量和渗透率变化、开始出砂的时间和出砂量的多少确定了不同小层的出砂临界流量;不同流体(非极性油和地层水)的出砂临界流量有很大差别,水驱临界流量明显大于油驱临界流量,储层的应力状态对出砂临界流速有很大的影响,试验结果指导了现场生产。
Sand production in unconsolidated sandstones is extremely harmful and the accurate determination of the critical flow rate of sand production is particularly important. Sand simulating experiment of small core under different fluid and overburden was carried out on N21 reservoir of Qinghai Oilfield using the sand production simulation test device developed by ourselves. The results show that the critical flow rate of sand production in different small layers is determined by the change of flow rate and permeability with different pressure difference, the time of starting sand production and the amount of sand production. Sand production with different fluids (nonpolar oil and formation water) The critical flow rate is very different. The critical flow rate of water flooding is obviously larger than the critical flow rate of oil flooding. The stress state of reservoirs has a great influence on the critical flow rate of sand production. The test results guide the on-site production.