Fully Coupled Thermal-Hydraulic-Mechanical Analysis of Hydraulic Fracture in Offshore Cuttings Re-Injection

Shuai Zhang, Yongcun Feng, Bin Li
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Abstract

Cuttings reinjection is an effective way to treat oilfield waste. There is still a risk of slurry leakage during the field operations although cuttings re-injection technology has been widely used. The study of fracture initiation and propagation during cuttings re-injection is important for operational design. Fracturing is a complex physical process that combines fluid seepage, temperature diffusion, stress change, and rock damage. In offshore cuttings re-injection projects, the temperature difference between the injection slurry and the formation has a significant impact on the fracture behaviors, especially in high-temperature-high-pressure (HTHP) formations. In this paper, a fully coupled thermal-hydraulic-mechanical (THM) model was developed by the cohesive element method for modeling cuttings re-injection. The multi-physical field evolution in cuttings re-injection process in HTHP offshore formation was studied. The simulation results show that the cooling effect of the injection fluid causes the contraction of the formation which leads to an increase in the tensile stress of the rock and a decrease in the formation fracture pressure. The cooling effect results in a wider and shorter fracture than the case without the consideration of the cooling effect. Therefore, it allows more slurry to be injected in a limited near-wellbore zone, reducing the risk of slurry leakage during the injection process. The cooling effect is positively correlated with the temperature difference between the injection slurry and the formation.
海上岩屑回注水力破裂的热-液-力全耦合分析
岩屑回注是处理油田废弃物的有效途径。尽管岩屑回注技术已被广泛应用,但在现场作业中仍存在泥浆泄漏的风险。研究岩屑回注过程中裂缝的起裂和扩展对作业设计具有重要意义。压裂是一个复杂的物理过程,涉及流体渗流、温度扩散、应力变化和岩石损伤。在海上岩屑回注项目中,注入泥浆与地层之间的温差对裂缝行为有显著影响,特别是在高温高压地层中。本文采用内聚元法建立了岩屑回注的热-液-力全耦合模型。研究了海上高温高压地层岩屑回注过程中多物场演化规律。模拟结果表明,注入液的冷却作用导致地层收缩,导致岩石拉应力增大,地层破裂压力降低。与不考虑冷却效应的情况相比,考虑冷却效应后的断口更宽、更短。因此,它允许在有限的近井区域注入更多的泥浆,降低了注入过程中泥浆泄漏的风险。冷却效果与注入液与地层之间的温度差呈正相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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