Anisortopic Modeling of Hydraulic Fractures Height Growth in the Anadarko Basin

IF 12.2 1区 工程技术 Q1 MECHANICS
Ahmed Merzoug, Abdulaziz Ellafi, Vamegh Rasouli, Hadi Jabbari
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引用次数: 2

Abstract

Correct estimation of hydraulic fracture height growth is a critical step in the design of Hydraulic Fracturing (HF) treatment, as it maximizes the reservoir stimulation and returns on investment. The height of the fractures is governed by several in situ conditions, especially stress variation with depth. The common workflow to estimate stress is by building the mechanical earth model (MEM) and calibrating it using the Diagnostic Fracture Injection Test (DFIT). However, DFIT interpretation is a complex task, and depending on the method used, different results may be obtained that will consequently affect the predicted hydraulic fracture height. This work used the tangent and compliance methods for DFIT interpretation, along with isotropic and anisotropic stress profiles, to estimate the HF height growth using numerical modeling in a 3D planar HF simulator. Data from two wells in the Anadarko Basin were used in this study. The predicted height was compared with microseismic data. The results showed that even though the tangent method fits better to the isotropic stress profile, HF did not match with the microseismic data. On the contrary, the anisotropic stress profile showed a good match between the compliance DFIT model and the microseismic events. Based on the discussions presented in this study, the validity of the DFIT interpretation is debatable, and when the formations are anisotropic, the isotropic model fails to correctly estimate the minimum stress profile, which is the main input for the estimation of the fracture height. This is in addition to the fact that some researchers have questioned the use of the tangent method in low-permeability formations.
阿纳达科盆地水力裂缝高度增长的各向异性模拟
正确估计水力裂缝高度增长是水力压裂(HF)处理设计的关键步骤,因为它可以最大限度地提高储层的增产效果和投资回报。裂缝的高度受几种原位条件的影响,特别是应力随深度的变化。估计应力的常用工作流程是通过建立力学地球模型(MEM)并使用诊断裂缝注入测试(DFIT)对其进行校准。然而,DFIT解释是一项复杂的任务,根据使用的方法不同,可能会得到不同的结果,从而影响水力裂缝高度的预测。这项工作使用了DFIT解释的切线和柔度方法,以及各向同性和各向异性应力剖面,通过三维平面HF模拟器的数值模拟来估计HF高度的增长。该研究使用了阿纳达科盆地两口井的数据。将预测高度与微震资料进行了比较。结果表明,尽管切线法较好地拟合了各向同性应力剖面,但HF与微震资料并不匹配。相反,各向异性应力剖面在柔度DFIT模型与微地震事件之间表现出较好的匹配。基于本研究的讨论,DFIT解释的有效性是有争议的,当地层是各向异性时,各向同性模型不能正确估计最小应力剖面,而最小应力剖面是估计裂缝高度的主要输入。此外,一些研究人员还质疑切线法在低渗透地层中的应用。
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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来源期刊
CiteScore
28.20
自引率
0.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: Applied Mechanics Reviews (AMR) is an international review journal that serves as a premier venue for dissemination of material across all subdisciplines of applied mechanics and engineering science, including fluid and solid mechanics, heat transfer, dynamics and vibration, and applications.AMR provides an archival repository for state-of-the-art and retrospective survey articles and reviews of research areas and curricular developments. The journal invites commentary on research and education policy in different countries. The journal also invites original tutorial and educational material in applied mechanics targeting non-specialist audiences, including undergraduate and K-12 students.
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