Laboratory Tests and Well Rate Models of Crushed Micro-Proppants to Improve Conductivity of Hydraulic Microfractures

Ya Tian, Fu-jian Zhou, M. Aljawad, R. Weijermars, Mingjiang Wu, Ben Li
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引用次数: 2

Abstract

This study proposes an innovative crushing rate evaluation method for micro-proppants by analyzing hydraulic crushing and steel crushing rates. The effectiveness of using micro-proppants to increase the drainage area of the micro-fractures network was also proved. Our results show that for micro-proppants, there occur two types of crushing evolution during the fracturing process. Under a load of 70 MPa, the hydraulic crushing rate is about 20%, while the steel crushing rate is more than 60%. The critical closure stress of micro-proppants is 50 MPa, which can be used to depths up to 4,200 m. Numerical simulation results showed that due to the presence of micro-proppants, the effectively propped area of the fracture network would sharply increase, accompanied by an over 40% increase in the initial hydrocarbon production rate. The later, steady production period will show a sustained increase of more than 20%.
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破碎微支撑剂提高水力微裂缝导流能力的实验室试验和井速模型
通过分析水力破碎速率和钢材破碎速率,提出了一种新型的微支撑剂破碎速率评价方法。实验还证明了微支撑剂增加微裂缝网络排水面积的有效性。研究结果表明,对于微支撑剂,在压裂过程中会发生两种类型的破碎演化。在70 MPa载荷下,液压破碎率约为20%,而钢材破碎率在60%以上。微支撑剂的临界闭合应力为50 MPa,可应用深度达4200 m。数值模拟结果表明,由于微支撑剂的存在,裂缝网络的有效支撑面积急剧增加,初始油气产量提高40%以上。后期稳产期将呈现持续增长20%以上的态势。
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