多级交替注入垫层和酸液的酸压裂模拟

Rencheng Dong, M. Wheeler, Hang Su, K. Ma
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引用次数: 3

摘要

酸压技术在提高碳酸盐岩储层产能方面得到了广泛应用。酸裂导电性是由裂缝表面不均匀的酸蚀产生的。碳酸盐岩储层矿物分布不均会导致酸蚀不均匀。此外,粘性指法可以增强非均匀酸蚀。对于低渗透的碳酸盐岩储层,在酸压裂过程中,通过多级交替注入低粘度酸和高粘度聚合物垫液,酸倾向于形成粘性手指,不均匀地蚀刻裂缝表面。为了准确预测酸裂缝导流能力,建立了三维酸压裂模型,计算了垫块与酸液多级交替注入引起的粗酸裂缝几何形状。基于开发的数值模拟系统,研究了粘性指法、射孔设计和阶段周期对酸蚀过程的影响。与单段注酸相比,多级交替注入垫块和酸液可使酸蚀通道变窄、变长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling Acid Fracturing Treatments with Multi-Stage Alternating Injection of Pad and Acid Fluids
Acid fracturing technique is widely applied to stimulate the productivity of carbonate reservoirs. The acid-fracture conductivity is created by non-uniform acid etching on fracture surfaces. Heterogeneous mineral distribution of carbonate reservoirs can lead to non-uniform acid etching during acid fracturing treatments. In addition, the non-uniform acid etching can be enhanced by the viscous fingering mechanism. For low-perm carbonate reservoirs, by multi-stage alternating injection of a low-viscosity acid and a high-viscosity polymer pad fluid during acid fracturing, the acid tends to form viscous fingers and etch fracture surfaces non-uniformly. To accurately predict the acid-fracture conductivity, this paper developed a 3D acid fracturing model to compute the rough acid fracture geometry induced by multi-stage alternating injection of pad and acid fluids. Based on the developed numerical simulator, we investigated the effects of viscous fingering, perforation design and stage period on the acid etching process. Compared with single-stage acid injection, multi-stage alternating injection of pad and acid fluids leads to narrower and longer acid-etched channels.
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