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Acid-etched fracture length and conductivity experiments with relayed large-scale rock plates
Journal of Petroleum Science and Engineering ( IF 5.168 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.petrol.2020.107978
Fei Liu , Huiyun Ma , Li Li , Changlin Zhou , Zhifeng Luo , Xinping Gao , Yong Wu

Acid etched fracture length and conductivity affect the carbonate stimulation effect. In this paper, acid-etched experiments with large-scale rock plate (1000 mm × 100 mm × 15 mm) were performed to investigate the acid etched fracture length, pattern, and conductivity. The relayed rock plates were etched with spent acid, collected from the outlet of previous plates, to simulate acid flow and reaction in a long artificial fracture. The rock plates were scanned with laser profilometer before and after acid etching to study etch behavior. The acid-etched fracture conductivity was measured under different closure stresses. The effective acid-etched fracture length is the fracture position with residual acid concentration. The results showed that the effective acid-etched fracture lengths with retarded acid were much higher than conventional acid, and most of the acid is consumed near the fracture heel. The acid-etched fracture pattern of self-diverting acid shows stronger non-uniformity with higher acid concentration, and more uniformly with lower acid concentration. The acid-etched fracture conductivity distribution along the whole artificial fracture is obtained with several relayed large-scale rock plates. And the acid-etched fracture conductivity obtained from large-scale rock plate is much lower than that from an API (American Petroleum Institute) rock plate. This study provided an experimental measure for acid-etched fracture length and global fracture conductivity evaluation.



中文翻译:

中继大型岩石板的酸蚀裂缝长度和电导率实验

酸蚀后的裂缝长度和电导率会影响碳酸盐岩的增产效果。本文采用大型岩石板(1000 mm×100 mm×15 mm)进行酸蚀实验,以研究酸蚀裂缝的长度,图案和电导率。中继的岩石板用废酸蚀刻,从前一块板的出口处收集,以模拟长时人工裂缝中的酸流和反应。在酸蚀刻之前和之后,用激光轮廓仪扫描岩石板以研究蚀刻行为。在不同的闭合应力下测量酸蚀后的断裂电导率。有效酸蚀的断裂长度是具有残余酸浓度的断裂位置。结果表明,使用缓凝酸的有效酸蚀断裂长度远高于常规酸,大部分酸被消耗在骨折后跟附近。自分散酸的酸蚀断裂图案在较高的酸浓度下表现出更强的不均匀性,而在较低的酸浓度下表现出更均匀的不均匀性。用几个中继的大型岩石板获得了沿整个人工裂缝的酸蚀裂缝电导率分布。而且,从大型岩石板获得的酸蚀断裂电导率远低于从API(美国石油学会)岩石板获得的酸蚀断裂电导率。该研究为酸蚀裂缝长度和整体裂缝电导率评估提供了实验方法。酸浓度较低时更均匀。用几个中继的大型岩石板获得了沿整个人工裂缝的酸蚀裂缝电导率分布。而且,从大型岩石板获得的酸蚀断裂电导率远低于从API(美国石油学会)岩石板获得的酸蚀断裂电导率。该研究为酸蚀裂缝长度和整体裂缝电导率评估提供了实验方法。酸浓度较低时更均匀。用几个中继的大型岩石板获得了沿整个人工裂缝的酸蚀裂缝电导率分布。而且,从大型岩石板获得的酸蚀断裂电导率远低于从API(美国石油学会)岩石板获得的酸蚀断裂电导率。该研究为酸蚀裂缝长度和整体裂缝电导率评估提供了实验方法。

更新日期:2020-10-02
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