A new well pattern of cluster-layout for deep geothermal reservoirs: Case study from the Dezhou geothermal field, China

地温梯度 磁导率 石油工程 各向异性 环境科学 地热能 热的 地质学 岩石学 地球物理学 气象学 地理 化学 量子力学 生物化学 物理
作者
Guihong Liu,Guiling Wang,Zhihong Zhao,Feng Ma
出处
期刊:Renewable Energy [Elsevier]
卷期号:155: 484-499 被引量:32
标识
DOI:10.1016/j.renene.2020.03.156
摘要

A well pattern of cluster-layout is proposed to reduce the risk of thermal breakthrough at production wells, as well as to improve the convenience of surface management. Its performance in the heterogeneous porous geothermal reservoir models based on the Dezhou geothermal field, China is systematically examined using the coupled thermal-hydraulic numerical modeling. In order to compare the performance of different well patterns, three assessment parameters including thermal breakthrough time and water table of production wells and recovery efficiency of geothermal energy in the licensed region are defined. The results showed that the well pattern of cluster-layout has the higher recovery efficiency of geothermal energy compared with other well patterns of tramrail-layout and checkers-board-layout for most simulations. Effects of anisotropy and correlation length of reservoir permeability on the performance of different well patterns are examined. Flow channeling appears along the direction of high permeability, and thus the injection-production direction should avoid to be parallel with that direction. With increasing correlation length, the possibility of flow channels appearing in the licensed region increases and the fate of production wells declines. When the difference of correlation lengths between different directions increases, the induced anisotropy of reservoir permeability increases but the recovery efficiency decreases.
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