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首页> 外文会议>Geothermal Resources Council Annual Meeting >Numerical Simulation of the Large-Scale Geothermal Reservoir With Multiple-Borehole-Circulation System
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Numerical Simulation of the Large-Scale Geothermal Reservoir With Multiple-Borehole-Circulation System

机译：多井孔循环系统大型地热储层的数值模拟

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Design and development of the large-scale geothermal HDR/HWR reservoirs with the multiple-borehole circulation systems can be one of the effective engineering approaches for producing geothermal energy in big amounts, sufficient for further industrial utilization. The major factor that may affect the productivity of this large-scale geothermal reservoir is a proper geometrical arrangement of the multiple-borehole-circulation-system. The numerical simulator FRACSIM-3D is applied for defining the sufficient reservoir size and the relevant multiple-borehole system configurations. Based on the series of computations the efficient location of the production wells is proposed. Within the proposed well arrangement, the number of production wells can be effectively minimized without reduction of the reservoir total thermal output. Assuming a composite multi-unit structure of the reservoir as a hierarchical system, where the whole reservoir consists of a finite number of unites (each local unit has its symmetrically distributed system of injection and production wells), makes possible to reduce the total number of production wells by 55%. The latter was shown on the basis of the large-scale reservoir model with 9 tetragonal overlapped multi-unit systems. Numerical modeling of the composite reservoir constituted by 9 overlapped multiple-borehole units shows that this type of arrangement is more efficient comparing with 9 independent (non-overlapped) units. The flow rate from the production wells located in the overlapped regions of the multi-unit reservoir is higher than in the wells placed within the non-overlapped regions. Since during the stimulation stage the overlapped areas of the multi-unit reservoir are affected by several injection wells, they have higher fracture density than non-overlapped areas. For the multi-unit reservoir system, the total thermal output is almost proportional to the number of the reservoir units. Numerical simulations for the different multi-unit well configurations show that creation of large-scale geothermal reservoirs with effectively arranged multiple-borehole systems is a quite feasible method to enhance thermal performance of the reservoir.
机译：具有多层孔循环系统的大型地热HDR / HDR储存器的设计和开发可以是生产大量地热能量的有效工程方法之一，足以进一步的工业利用。可能影响该大型地热储层生产力的主要因素是多层孔循环系统的适当几何布置。应用数值模拟器FRACSIM-3D用于定义足够的储液尺寸和相关的多钻孔系统配置。基于一系列计算，提出了生产井的有效位置。在所提出的井布置内，可以有效地最小化生产井的数量，而不会降低储层总热输出。假设储存器的复合多单元结构作为分层系统，其中整个水库包括有限数量的单位（每个本地单元具有其对称分布的注射和生产井），可以减少总数生产井55％。基于带有9个四方重叠的多单元系统的大规模储层模型显示后者。由9个重叠的多层孔单元构成的复合储存器的数值建模表明，这种类型的布置与9个独立（非重叠）单位进行比较更有效。来自多单元储存器的重叠区域的生产孔的流速高于放置在非重叠区域内的孔中。由于在刺激阶段期间，多单元储存器的重叠区域受几个注射孔的影响，它们具有比非重叠区域更高的断裂密度。对于多单元储层系统，总热输出几乎与储存器单元的数量成比例。不同多单元井配置的数值模拟表明，具有有效布置的多层孔系统的大型地热储层的创建是增强储层热性能的可行方法。

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