Experimental study on the interaction mechanism between fracturing fluid and continental shale oil reservoir

IF 1.5 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geosystem Engineering Pub Date : 2023-03-29 DOI:10.1080/12269328.2023.2194884
Yi-Hang Wang, Xiaoping Li, Li Yin, Kun Wang, Jing Xie, Zhi-Li Li
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Abstract

ABSTRACT Onshore shale oil is difficult to develop due to its special pore structure and low permeability characteristics. Artificial fracturing causes a large amount of fracturing fluid to intrude into the reservoir, resulting in a complex reservoir seepage pattern. Therefore, this paper aims to explore the changes in the reservoir at the macro and micro levels due to the interaction between fracturing fluids and shale oil reservoirs. For this, four rock samples from shale oil reservoirs and two fracturing fluids commonly used in the mine were used. Then, core repulsion, scanning electron microscopy, X-ray diffraction and CT scanning experiments were carried out successively. The following results were derived from our analyses. (1) Permeability of the rock samples was reduced by an average of 24.47% after replacement by fracturing fluid, while the experimental groups with larger fluid-grain sizes and well-developed fracture networks suffered more significant solid-phase damage and fluid-phase trapping. (2) Fracturing fluids have different effects on fractures at different scales; large fractures (>7.71 μm) were widened, while small fractures (<3.47 μm) were shrunk or even plugged. (3) Based on the water-sensitive effect, fracturing fluids can disperse and transport clay minerals, resulting in fluid-phase damage and an average decrease of 14.33% in clay content in the reservoir. (4) Analysis of the digital core model shows that fracturing fluid intrusion and retention can cause solid-phase damage to the reservoir matrix, with 38.14% and 60% damage to the pore and throat channels, respectively. This paper uses a combination of physical experiments and numerical analysis to investigate the interaction mechanism between fracturing fluids and shale oil reservoirs from both microscopic and macroscopic perspectives. Overall, the results of this study provide experimental support for future studies on the seepage characteristics of this type of reservoir and the design of fracturing construction schemes.
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压裂液与陆相页岩油储层相互作用机理实验研究
陆上页岩油由于其特殊的孔隙结构和低渗透特性,开发难度较大。人工压裂导致大量压裂液侵入储层,形成复杂的储层渗流模式。因此,本文旨在从宏观和微观两个层面探讨压裂液与页岩油储层相互作用对储层的影响。为此,使用了从页岩油藏中提取的4个岩石样本和矿井中常用的两种压裂液。然后,依次进行磁芯斥力、扫描电镜、x射线衍射和CT扫描实验。以下是我们分析得出的结果。(1)压裂液替代后,岩样渗透率平均降低24.47%,而液粒尺寸较大、裂缝网络发育较好的实验组固相损伤和液相圈闭更为明显。(2)压裂液对不同尺度裂缝的作用效果不同;大裂缝(>7.71 μm)加宽,小裂缝(<3.47 μm)缩小甚至堵塞。(3)基于水敏效应,压裂液可以分散和输送粘土矿物,造成相损害,使储层黏土矿物含量平均降低14.33%。(4)数字岩心模型分析表明,压裂液侵入和滞留会对储层基质造成固相损害,对孔隙通道和喉道的损害分别为38.14%和60%。本文采用物理实验与数值分析相结合的方法,从微观和宏观两个角度研究压裂液与页岩储层的相互作用机理。综上所述,本研究结果为进一步研究该类储层渗流特征及压裂施工方案设计提供了实验支持。
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来源期刊
Geosystem Engineering
Geosystem Engineering GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
2.70
自引率
0.00%
发文量
11
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