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对于裂缝——孔洞性碳酸盐岩油层,是采用低速开采效果好,还是高速开采效果好,目前存在着不同的认识。为了探讨这一问题,我们在室内应用剖面物理模型,进行了不同注水速度对采收率影响的试验。所谓注水速度,其含义是每分钟的注水量(毫升/分),在见水前等于采油速度,在见水后等于采液速度。通过试验取得了一些初步的认识。一、模型及试验条件模型岩块是采用雾迷山组地面露头制作的,岩性以硅质白云岩为主,缝洞发育,呈蜂窝状。先将岩样加工成4×4×2厘米的单元岩块,然后拼接成50×20厘米的剖面模型。岩块之间的自然拼缝,代表油层岩块之间的大裂缝。
There is a different understanding of fractured-porous carbonate reservoirs because of their low-speed mining effect and high-speed mining effect. In order to explore this issue, we applied the physical model of the profile indoors and conducted experiments on the effect of different water injection rates on oil recovery. The so-called water injection speed, which means that the amount of water per minute injection (ml / min), in the water before the oil production rate is equal to see the water is equal to the speed of liquid production. Some preliminary findings have been obtained through experiments. First, the model and experimental conditions Model rock block is the use of the Wushan Mountain outcrop of production, the lithology of siliceous dolomite-based, the development of fractured holes were honeycomb. The rock samples were first processed into 4 × 4 × 2 cm unit blocks and then spliced into a 50 × 20 cm section model. The natural patchwork between the rock blocks represents a large gap between the rock blocks.