Study on Acid Fracturing Technology for Carbonate Reservoirs in Ordos Basin

Mu Li, Lufeng Zhang, Minghui Li
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Abstract

Acid fracturing, a key stimulation technology, has been widely applied in carbonate formations, which have the complex reservoir space and natural fracture. However, the conventional acid fracturing technology has limitations in target reservoir due to serious acid leakage and rapid acid-rock reaction speed. Therefore, a deep-penetration acid fracturing technology was proposed to enhance the stimulation effect. The reservoir basic physical properties, such as permeability and porosity, microstructure characteristic of pore throats, mineral composition, and rock mechanics characteristics, were systemically investigated by a series of laboratory experiments. The acid system was also optimized by evaluating rheological properties and residual acid damage. Furthermore, the most important two parameters of acid fracturing, conductivity and effective acid-etched fracture length, were obtained by numerical simulation with commercial software Fracpro PT. Based on the laboratory studies, the acid fracturing technology was applied in the field, and the production of well increased by 1.7 times after stimulation.
鄂尔多斯盆地碳酸盐岩储层酸压技术研究
碳酸盐岩储层具有复杂的储层空间和天然裂缝,酸性压裂作为一项关键的增产技术已得到广泛应用。然而,常规酸压技术在目标储层中由于漏酸严重,酸岩反应速度快,存在一定的局限性。为此,提出了深穿透酸性压裂技术,以提高增产效果。通过一系列室内实验,系统研究了储层的渗透率、孔隙度、孔喉微观结构特征、矿物组成、岩石力学特征等基本物性特征。通过评价酸体系的流变性能和残余酸损伤对酸体系进行了优化。利用Fracpro PT商业软件进行数值模拟,获得了酸压最重要的两个参数——导流能力和有效酸蚀裂缝长度。在实验室研究的基础上,将酸压技术应用于现场,增产后的油井产量提高了1.7倍。
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