复杂碳酸盐岩储层酸压沟通模式识别新方法与应用

A NEW METHOD RECOGNIZING FRACTURE COMMUNICATION MODES DURING ACID FRAC IN COMPLICATED CARBONATE RESERVOIRS AND ITS APPLICATION

酸压是缝洞型碳酸盐岩储层建产的关键技术手段之一,酸压沟通储集模式对酸压效果影响显著。文章基于单井酸压改造效果,对塔里木台盆区近年来160余井次施工曲线进行了分类评价,创建了酸压施工过程压降和停泵压降组合识别碳酸盐岩储层酸压沟通储集模式新方法,形成了能快速识别酸压沟通模式的"双压降法"分析图版。文章运用新方法将塔里木台盆区酸压沟通模式细分为中大型溶洞、小型或充填型溶洞、微裂缝小孔洞发育型以及孔洞型储层。该方法具有较强的实用性和较高的可靠性,能够有效识别酸压沟通模式,为后期措施和注水方案设计提供指导。

Acid frac is one of the key stimulation methods for fractured-vuggy carbonate reservoirs,how the fractures be communicated during the acid frac affects the stimulation results remarkably. Described here in this paper,an evaluation was made regards enhancements in individual wells by studying the acid frac curves of over 160 wells in in recent years atT aipen region in Tarim. A new method was set up to recognize the fracture communication modes in carbonate reservoirs during acid frac based on the acidizing pressure drop data and pump-out pressure drop data. An analytic double-pressure-drop chart was developed for fast recognition. With this new method,the fracture communication modes at Taipen can be classified into largescale cavern type,medium cavern type,filling cavern type,microfrac-vug type and vug type. The application shows that this method is highly practical and reliable,able to effectively determine the fracture communication modes during acid frac,providing guidance for later operation and water-flooding program planning.