供给型大尺度溶洞弹性开采实验

 大尺度溶洞是塔河油田缝洞型油藏的重要油气储集空间，是相对较简单的油藏类型之一，并普遍存在供给能量。对有供给能量的大尺度溶洞油藏弹性开采情况进行实验模拟，建立了存在两种能量供给形式的物理模型：充填溶洞模型、基岩窜流供给模型。通过改变实验中溶洞充填程度、基质渗流能力、采油速度的大小分析各影响因素对模型的压力、能量补给的影响。结果表明，对于存在充填的溶洞模型，采油速度主要影响了充填物底部与溶洞内压力差，充填物渗透率主要影响了溶洞内的能量补给速度；对于存在基质供给的溶洞模型，单对数坐标下压力变化前期呈直线递减，后期表现出不同的递减幅度，基质的渗流能力直接影响其窜流供液能力，累积产量与累积压降关系曲线前期呈直线，后期存在明显的上翘段，表明存在明显的基质窜流供给段。

Experimental Study of Elastic Production in Supply-type Large-scale Cavity Reservoir

The large-scale vug is a kind of important oil and gas reservoir space in the Tahe oilfield, of relatively simple reservoir types and with abundant energy supply. In this paper, experimental simulations are carried out for the large-scale cave elastic reservoir. Physical models of two different energy supply forms are established, that is, the filled cave model and the matrix supply and flowing model. Experiments for different degrees of cave filling, different matrix permeability and different oil production rates are carried out. The results show that for the filled cavity model, the oil production rate mainly affects the pressure difference between the bottom of filling and the inside of caves. The permeability of filling mainly affects the speed of energy supplies. For the cavity model with substrate supply, the pressure assumes a linear variation in a single logarithmic coordinate in the early period, and then decreases with different rates in the later period, and the permeability of the substrate directly affects its liquid flow channeling ability. The relation curves of the cumulative production and the cumulative pressure drop are linear in the early period, and then assume an obvious upturned segment in the later period, which apparently shows that the substrate channeling supply section exists.