不同砾石含量砂砾岩酸蚀裂缝导流能力

Flow conductivity of acid etching fracture of the glutenites with various gravel content

九龙山珍珠冲组为一套含灰质砂砾岩的低孔低渗储层,通过酸压手段改善该类储层的导流能力提高气井产能。酸蚀裂缝导流能力是衡量酸压成功与否的关键因素之一,针对含灰质砂砾岩,借助酸蚀裂缝导流能力的实验测试结果,总结了不同酸液类型、不同砾石含量对含灰质砂砾岩酸蚀裂缝导流能力的影响,得出针对不同砾石含量选择不同酸液类型获得的导流能力区间,验证了砾石含量在40%～60%时酸蚀裂缝导流能力值最高,为今后该类储层的酸压工艺提供指导。

Zhenzhuchong formation in Jiulongshan is a series of low-porosity and low-permeability reservoirs with calcareous glutenites, and acid fracturing treatment has been applied to improve the flow conductivity for the purpose of productivity enhancement. Considering that acid etching fracture conductivity is one of the key factors to the success of acid fracturing, this paper aimed at calcareous glutenites, with the help of experimental testing resuhs of acid fracture flow conductivity, aud summarized the effects of different acid types and different gravel contents on acid fracture flow conductivity and further more obtained the conductivity ranges by different acid types selection for different gravel contents, and finally verified that acid fracture conductivity peaked when gravel content varied between 40 % and 60 %, which was of great importance in guiding the future acid fracturing for such reservoirs.