Coupled Thermo-hydro-mechanical Simulation of Hydraulic Fracturing in Deep Reservoirs Using Finite-Discrete Element Method
Coupled Thermo-hydro-mechanical Simulation of Hydraulic Fracturing in Deep Reservoirs Using Finite-Discrete Element Method
复制标题
深层油藏水力压裂有限离散元热-水-力耦合模拟
DOI：
10.1007/s00603-023-03325-z
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发表时间：
2023
影响因子：
6.2
通讯作者：
Akira Sato & Luming Shen
中科院分区：
文献类型：
--
作者：
Mansour Sharafisafa;Zeinab Aliabadian;Akira Sato & Luming Shen
水力压裂是提高储层渗透率最有效的增产技术之一。高频注液的效率取决于先前存在的不连续性或非均质性来源，在高频手术治疗中需要考虑这些特征。此外，深层油气藏通常位于干热岩石(HDR)中。因此，岩石和流体中的热传导以及流体中的对流和对流换热都会影响流体-岩石的相互作用。本研究主要研究高温条件下深层储集层中高频的开发。考虑了两种不同的情况：包含离散裂缝网络(DFN)的储集层和将基质中的区块视为砾岩储集层(所考虑的情景之间没有关系)。这项研究分别讨论了每个储集层，并使用有限元和离散元相结合的方法(FDEM)模拟了它们的热-水-力(THM)行为。首先，根据现有的解析解验证FDEM的能力，然后使用FDEM模拟高频发展。研究了节理油藏流量、流体运动粘度、DFN孔径等控制因素和砾岩油藏流量、流体运动粘度、块体强度等控制因素的影响。结果表明，高裂缝密度DFN对高频传播模式和流体压力升高有很强的影响。此外，DFN的孔径显著改变了HF的治疗行为。观察到控制因素对高频模式有很大的影响，而成功的高频治疗需要仔细考虑所有因素。在砾岩油藏中，块体的强度强烈地主导了高频机制，其中软块破裂，允许均匀的流体压力分布和较长的HFs，而硬块阻止流体在注入周围积累高的流体压力，从而阻止流体在更远的距离上流动。这种机制过度破坏了基质，降低了HF的效率。由于块体、基质和流体之间的热交换，砾岩油藏中裂缝分支频繁发生。
Hydraulic fracturing (HF) is one of the most effective stimulation techniques to enhance reservoir permeability. The efficiency of an HF fluid injection depends on the pre-existing discontinuities or sources of heterogeneities and these features need to be considered in a HF operation treatment. Moreover, deep reservoirs are usually located in hot dry rocks (HDR). Hence, thermal conduction through the rock and fluid and advection and convective heat transfer in the fluid can affect the fluid–rock interaction. This study focuses on HF development in deep reservoirs under a high-temperature field. Two separate scenarios are considered: a reservoir containing discrete fracture networks (DFN) and another considering blocks in a matrix as conglomerate reservoirs (there is no relation between the scenarios considered). The study discusses each reservoir separately and simulates their thermo-hydro-mechanical (THM) behaviour using the combined finite-discrete element method (FDEM). First, the capabilities of the FDEM are verified against the existing analytical solutions, and then the FDEM is employed to model HF development. The effects of controlling factors, including flow rate, fluid kinematic viscosity and DFN aperture for jointed reservoirs and flow rate, fluid kinematic viscosity and block strength in conglomerate ones, are studied. The results show that the high fracture density DFNs strongly affect the HF propagation pattern and fluid pressure rise. Moreover, the DFN’s aperture significantly alters the HF treatment behaviour. The controlling factors are observed to influence the HF pattern strongly, and a successful HF treatment requires careful consideration of all the factors. In the conglomerate reservoirs, the strength of the blocks strongly dominates the HF mechanism, in which soft blocks break and allow for uniform fluid pressure distribution and longer HFs, while hard blocks stop fluid from flowing over longer distances accumulating high fluid pressure around the injection. This mechanism excessively breaks the matrix and reduces HF efficiency. Crack branching frequently occurs in conglomerate reservoirs due to thermal exchange between the blocks, matrix, and fluid.
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DOI：
10.1016/j.ijrmms.2020.104348
发表时间：
2020-08
影响因子：
7.2
作者：
Bin Chen;J. Xiang;J. Latham;R. Bakker
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发表时间：
2021
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