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首页> 外文会议>Stanford Geothermal Program, Workshop on Geothermal Reservoir Engineering >MINERAL CHARACTERIZATION OF SCALE DEPOSITS IN INJECTION WELLS; COSO AND SALTON SEA GEOTHERMAL FIELDS, CA
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MINERAL CHARACTERIZATION OF SCALE DEPOSITS IN INJECTION WELLS; COSO AND SALTON SEA GEOTHERMAL FIELDS, CA

机译：注射孔中矿沉积物的矿物特征; Coso和Salton海地热领域，加州

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The geochemical effects of injecting fluids into geothermal reservoirs are poorly understood and may be significantly underestimated. Decreased performance of injection wells after 5 to 7 years of injection has been documented in several geothermal fields. In this study, the effects of injecting flashed geothermal fluids into the Coso and Salton Sea geothermal fields, California are investigated by comparing drill cuttings from the original injection wells with samples from wells drilled on the same pads after injectivities in the original wells had declined. At Coso the fluids injected into 68-20 had silica contents up to 940 ppm and are grossly supersaturated in silica with respect to quartz, the stable silica phase in the reservoir. X-ray diffraction and scanning electron microscope analyses of the reservoir rock penetrated by redrilled injection well 68-20RD indicate that loss of injectivity in 68-20 was caused by the deposition of silica as opal-A accompanied by trace amounts of calcite near the well bore. As the scale deposits mature, the original 2 (mu)m spheres coalesce into larger spheres, up to 10 (mu)m in diameter and plate-like sheets. At the Salton Sea the fluids injected into Elmore IW3 RD are hypersaline and metal-rich but relatively silica poor. Scale deposits in the reservoir rocks near the injection well consist of layered barite and fluorite, accompanied by minor anhydrite, copper arsenic sulfides, and traces of amorphous silica.
机译：流体注入热储的地球化学效应知之甚少且可显著低估。后5〜7年注入注水井的性能下降已被记录在多个地热田。在这项研究中，注射闪过地热流体进入科索和索尔顿湖地热田的影响，加利福尼亚州通过从原来的注水井比较钻屑的样品从水井在原有井injectivities后的相同垫钻有所下降的影响。在科索流体注入到68-20具有二氧化硅含量高达940 ppm的和在二氧化硅过饱和严重相对于石英，在容器中的稳定二氧化硅相。通过redrilled注射穿透储层岩石的X射线衍射和扫描电子显微镜分析以及68-20RD指示注入的在68-20的损失是由二氧化硅作为沉积引起蛋白石-A伴有微量方解石的近井孔。作为水垢沉积成熟，原来的2（亩）米球体合并成较大的球，高达10（亩）米直径和板状片材。在索尔顿湖注入埃尔莫尔IW3 RD流体是高盐度和丰富的金属，但相对较差的二氧化硅。在注射附近的储集岩的水垢沉积以及由层状重晶石和萤石，伴有轻微硬石膏，铜砷硫化物，和无定形二氧化硅的迹线。

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