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DOI | 10.1029/2019WR025774 |
Partitioning Thresholds in Hybrid Implicit-Explicit Representations of Naturally Fractured Reservoirs | |
Wong, Daniel Lorng Yon1; Doster, Florian1; Geiger, Sebastian1; Kamp, Arjan2 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; U Arab Emirates |
英文摘要 | Fractures can have variable effects on fluid flow in a porous rock. Moderately conductive fractures may enhance the rock's overall effective permeability, while highly conductive fractures may completely dominate fluid transport. Fluid flow modeling is important to quantify the impact of fractures on the performance of a reservoir. However, simulating fluid flow is computationally intensive due to the heterogeneities introduced by the fracture network. In this work, complex fracture patterns are simplified using hybrid implicit-explicit representations to yield a computationally tractable model. Hybrid modeling requires the selection of a partitioning size to group fractures by size. Small fractures are upscaled with the rock matrix; large fractures are explicitly represented. Our study shows that, given a naturally fractured reservoir, an upper limit exists for the partitioning size and that this threshold partitioning size can be determined without trial and error. Using artificial and realistic fracture patterns, we created hybrid models using different partitioning sizes and subjected them to pressure drawdowns. Simulated production rates were compared against reference results obtained from simulations on the original fracture patterns. Beyond a threshold partitioning size unique to each fracture pattern, hybrid model results deviate significantly from reference solutions. The threshold is identified from the relationship between upscaled permeabilities and partitioning sizes and corresponds to the point where the effective permeability of small fractures begins to increase rapidly. The permeability-size relationship is obtained using numerical flow-based upscaling. For uniformly distributed fractures with no abutment relationships, the effective medium theory is shown to generate accurate permeability-size relationships. Plain Language Summary Naturally fractured reservoirs are exploited in several industries as they (1) may contain oil and gas, (2) can also be used to extract heat from underground, (3) form pathways for groundwater to flow, and (4) can be used to store CO 2 and mitigate climate change. As such, it is important to predict how fluids will move through such reservoirs. This is difficult because fractured reservoirs contain fractures that differ greatly in size. One approach that alleviates this problem is to represent the rock and smaller fractures by an equivalent porous medium that has a comparable flow behavior. Our study finds that this approach works, but there is a limit to what can be considered small. When this simplification is applied to fractures that are larger than the limit, the resulting equivalent representation fails to capture the correct flow behavior. We show that the limit can be predetermined by studying how the equivalent rock properties change with the size range of small fractures. We also show that this procedure can be carried out efficiently using a technique based on the effective medium theory. The findings in this study will allow industry practitioners to systematically simplify their fractured reservoir flow modeling problems. |
英文关键词 | upscaling fractures effective medium theory effective permeability percolation flow |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800058 |
WOS关键词 | EFFECTIVE PERMEABILITY ; FLUID-FLOW ; NETWORK ; MEDIA ; SIMULATION ; SYSTEMS ; MODELS ; MATRIX |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280543 |
专题 | 资源环境科学 |
作者单位 | 1.Heriot Watt Univ, Inst Petr Engn, Edinburgh, Midlothian, Scotland; 2.Total SA, Abu Dhabi, U Arab Emirates |
推荐引用方式 GB/T 7714 | Wong, Daniel Lorng Yon,Doster, Florian,Geiger, Sebastian,et al. Partitioning Thresholds in Hybrid Implicit-Explicit Representations of Naturally Fractured Reservoirs[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Wong, Daniel Lorng Yon,Doster, Florian,Geiger, Sebastian,&Kamp, Arjan.(2020).Partitioning Thresholds in Hybrid Implicit-Explicit Representations of Naturally Fractured Reservoirs.WATER RESOURCES RESEARCH,56(2). |
MLA | Wong, Daniel Lorng Yon,et al."Partitioning Thresholds in Hybrid Implicit-Explicit Representations of Naturally Fractured Reservoirs".WATER RESOURCES RESEARCH 56.2(2020). |
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