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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >New Injection Strategies at Blue Mountain, Nevada Through Tracer Test Analysis, Injection-Production Correlation, and an Improved Conceptual Model
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New Injection Strategies at Blue Mountain, Nevada Through Tracer Test Analysis, Injection-Production Correlation, and an Improved Conceptual Model

机译：蓝山，内华达州的新注射策略通过示踪试验分析，注射生产相关性和改进的概念模型

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The Blue Mountain geothermal field, a fault-controlled geothermal system in the Basin and Range, has been in operation since November 2009. The resource experienced significant temperature decline from an initial operational strategy that focused injection into wells down dip of the production zone. To mitigate the temperature decline, production rate in the fastest cooling well was reduced, which slowed the rate of cooling and decreased power output. This paper describes the strategy started in 2013 of mitigating temperature decline field-wide by adopting an injection management strategy based on the results of tracer testing, a new resource model, and well-to-well correlation of injections rates to production cooling. The resource model is based on fluid conduits and compartments created by the intersection of three west-dipping low angle faults. The fault geometries were fit to lost circulation zones identified during drilling, fluid exit/entry points in wells, and geophysical data - seismic reflection profiles, micro-seismicity, horizontal gravity gradient lineaments, and aeromagnetic data. The intersection between two faults formed a damage zone that creates a high permeability conduit defining the primary up-flow zone fed at depth by a piedmont fault delineated by gravity and seismic reflection on the west edge of the field. A fourth fault that bounds the range to the SW, trends NW and is considered to be a relatively impermeable structure due to its orientation in the current tectonic regime. The conceptual fault model was combined with tracer data to map potential flow patterns at depth, characterize reservoir geometry, and model the thermal behavior of the reservoir. This analysis was used to develop the permeability structure for a reservoir simulator that showed a much better history match than previous models. The new model and tracer analysis also provided the insight to design and implement an injection strategy using existing wells that has slowed temperature decline. Further plans to mitigate temperature decline evaluated by reservoir simulations, include producing some of the initial western injectors and stimulating idle wells further to the north and south.
机译：蓝山地热场地是一个在盆地和范围内的故障控制的地热系统，自2009年11月以来一直在运行。资源从初始运营策略中经历了显着的温度下降，将注射注射到生产区的井下井下。为了减轻温度下降，降低了最快的冷却井的生产率，减慢了冷却速率和降低的功率输出。本文介绍了2013年开始的策略，通过基于示踪测试，新资源模型和注射率的井井与生产冷却的井井相关性采用注射管理策略，通过采用注射管理策略。资源模型基于由三个西浸低角度故障的交叉产生的流体导管和隔室。故障几何形状适合钻井，流体出口/入口点识别的循环区，以及地球物理数据 - 地震反射曲线，微地震，水平重力梯度谱系和航空磁性数据。两个断层之间的交叉形成了一种损伤区域，该损伤区域产生高渗透性导管，该损伤导管在磁场的西部边缘的重力和地震反射中描绘的皮埃蒙特故障，归因于深度的初级上流区。将趋势的第四个故障绑定到SW的范围，趋势NW，并且被认为是由于其在当前构造方案中的方向而具有相对不可渗透的结构。概念性故障模型与示踪数据组合到映射深度的电位流动模式，表征储层几何形状，以及模型储存器的热行为。该分析用于开发储层模拟器的渗透结构，该模拟器显示出比以前的模型更好的历史匹配。新模型和跟踪分析还提供了使用速度下降的现有井设计和实施注射策略的洞察力。进一步计划减轻储层模拟评估的温度下降，包括生产一些初始的西部喷射器，并进一步刺激北部和南方的闲置井。

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