层状页岩油藏多集束压裂的裂缝相互作用与传播机理

IF 6 1区 工程技术 Q2 ENERGY & FUELS Petroleum Science Pub Date : 2024-08-01 DOI:10.1016/j.petsci.2024.02.007
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引用次数: 0

摘要

四川盆地侏罗系两高山地层大陆页岩储层含薄层,具有塑性强、纵壳灰岩夹层发育等特点。要通过多簇压裂提高储层的生产效率,必须考虑水力裂缝的不平衡传播和裂缝的渗透效应。本文基于有限元耦合粘聚区方法,构建了多压裂传播与渗透数值模型;考虑施工簇间距、泵速、层状强度等参数,研究了多簇压裂交互传播的影响因素;结合AE能量数据和断裂模式重构方法,定量表征了薄层间岩石界面强度对穿层裂缝发生和传播的综合影响,准确预测了水力裂缝在层状页岩油藏中的传播规律。模拟结果表明,在多簇压裂过程中,剪切破坏比例较低,主要发生在由外层裂缝激活的层理裂缝中。减小簇间距可提高压裂体系的穿透能力,但会降低层理的激活效率。石灰岩夹层的高塑性可能会影响主断裂的垂直传播距离。提高界面强度有利于断裂高度的重建,但界面沟通效果有限。合理选择层间强度适中的地层进行压裂激励,提高压裂过程中的泵速,合理设置簇间距,有利于提高储层激励效果。
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Fractures interaction and propagation mechanism of multi-cluster fracturing on laminated shale oil reservoir

The continental shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin contain thin lamina, which is characterized by strong plasticity and developed longitudinal shell limestone interlayer. To improve the production efficiency of reservoirs by multi-cluster fracturing, it is necessary to consider the unbalanced propagation of hydraulic fractures and the penetration effect of fractures. This paper constructed a numerical model of multi-fracture propagation and penetration based on the finite element coupling cohesive zone method; considering the construction cluster spacing, pump rate, lamina strength and other parameters studied the influencing factors of multi-cluster fracture interaction propagation; combined with AE energy data and fracture mode reconstruction method, quantitatively characterized the comprehensive impact of the strength of thin interlayer rock interfaces on the initiation and propagation of fractures that penetrate layers, and accurately predicted the propagation pattern of hydraulic fractures through laminated shale oil reservoirs. Simulation results revealed that in the process of multi-cluster fracturing, the proportion of shear damage is low, and mainly occurs in bedding fractures activated by outer fractures. Reducing the cluster spacing enhances the fracture system's penetration ability, though it lowers the activation efficiency of lamina. The high plasticity of the limestone interlayer may impact the vertical propagation distance of the main fracture. Improving the interface strength is beneficial to the reconstruction of the fracture height, but the interface communication effect is limited. Reasonable selection of layers with moderate lamina strength for fracturing stimulation, increasing the pump rate during fracturing and setting the cluster spacing reasonably are beneficial to improve the effect of reservoir stimulation.

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来源期刊
Petroleum Science
Petroleum Science 地学-地球化学与地球物理
CiteScore
7.70
自引率
16.10%
发文量
311
审稿时长
63 days
期刊介绍: Petroleum Science is the only English journal in China on petroleum science and technology that is intended for professionals engaged in petroleum science research and technical applications all over the world, as well as the managerial personnel of oil companies. It covers petroleum geology, petroleum geophysics, petroleum engineering, petrochemistry & chemical engineering, petroleum mechanics, and economic management. It aims to introduce the latest results in oil industry research in China, promote cooperation in petroleum science research between China and the rest of the world, and build a bridge for scientific communication between China and the world.
期刊最新文献
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