裂缝性灰岩储层酸液动滤失实验规律研究

Dynamic filtration experimental research of acid in fractured limestone

碳酸盐岩储层天然裂缝比较发育,有天然裂缝存在时,酸液沿天然裂缝流动,进入到油藏深处,同时通过扩散和对流的方式运动到裂缝表面与岩石反应,增加裂缝宽度,反过来增加滤失到天然裂缝里的酸量。因此,为了获得更好的裂缝性碳酸盐岩储层的酸压效果,必须分析酸液滤失的各影响因素。本文建立了一套完整的滤失实验装置及实验方法,通过室内实验,得出了裂缝导流能力、酸液滤失速率和酸岩反应速率直接的关系,对研究酸液在裂缝中的滤失过程具有重要的指导意义。

Carbonate reservoir is relatively fracture-developed.When natural fractures exist,acids flow into the reservoir through fracture surfaces and react with the rock on the surfaces because of diffusion and convection,resulting in wider fracture width,so increasing acid volumes leaking into natural fracture in turn. In order to obtain better acid-fracturing effect in fractured carbonate reservoir,it is necessary to understand and analyze the influences on acid filtration.This paper uses a set of dynamic filtration experimental apparatus and methods to get the relationship between fracture conductivity,acid filtration rate and acid-rock reaction rate. It plays a guided role to study acid filtrating process in fracture.