A technology has been proposed for the integrated development of low-temperature geothermal resources for using their thermal and water potentials for various purposes. The possibility is substantiated for efficient development of geothermal resources by construction of binary geothermal power plants (GeoPP) using idle oil and gas wells that will significantly reduce capital investments for their building. The East Ciscaucasian artesian basin situated in the South European part of Russia has a number of fields with idle wells that can be converted to thermal water production. Involving the entire fund of idle wells will make it possible to obtain up to 300 MW of summary net capacity at a geothermal power plant. This work proposes a deployment of hybrid technology of geothermal power plant coupled with combined cycle plant of gas turbine type (further GCP) for the effective utilization of medium-temperature thermal waters (80–100 °C). These technologies are shown to be promising for using such water for electricity generating with high efficiency. A comparative analysis was carried out for GeoPP and GCP operating on medium-temperature water, which has shown the advantage of the latter. According to the calculations, the implementation of hybrid technology at the Thernair field in Makhachkala town will make it possible to get a power plant capacity of up to 60 MW. The prospects of integrated processing of high-temperature geothermal brines are shown. The technological diagrams are presented where the electricity generated at a binary GeoPP is used in the unit for the chemical components extraction. The estimated parameters for the Berikey geothermal field are given. The proven reserves of the Berikey field thermal brines are shown to be promising for output more than 2000 tons of lithium carbonate annually. The prospects of integrated processing of high-temperature geothermal brines in the Tarumovka geothermal field have been presented. The thermal energy of the geothermal brine can be converted into electricity in a binary geothermal power plant using a low-boiling working agent. The Rankine thermodynamic cycles have been considered realized in the secondary circuit of the GeoPP at different temperatures of evaporation of the working agent isobutane. The most effective in terms of maximum power generation is a supercritical cycle, close to the so-called “triangular” cycle with an evaporation pressure p_e = 5.0 MPa. The spent brine with a low temperature from the GeoPP will go to a chemical plant, where the main chemical components, namely, lithium carbonate, magnesia, calcium carbonate and sodium chloride will be extracted according to the developed by us technology for the integrated utilization of hydrothermal brines. For the production of valuable inorganic materials, the electricity generated at the GeoPP may be applied. The need is shown in the priority integrated processing the associated highly saline brines of the Yuzhno-Sukhokumsk group of oil and gas wells in Northern Dagestan. At present, the associated brines with a radioactive background exceeding permissible standards are dumped onto surface filtration fields. Technological solutions for their decontamination and development have been proposed.

中文翻译：

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俄罗斯南部地热资源开发技术

已经提出了一种综合开发低温地热资源的技术，该技术可将其热能和水势用于各种目的。通过使用闲置的油气井建造二元地热发电厂（GeoPP），可有效开发地热资源的可能性得到了证实，这将大大减少其建设的资本投资。位于俄罗斯南欧部分的东西高加索自流盆地有许多油田，有闲置的井，可以转化为热水生产。将闲置井的全部资金投入使用，将有可能在地热发电厂获得最高300兆瓦的总净容量。这项工作提出了将地热发电厂的混合技术与燃气轮机类型的联合循环发电厂（进一步的GCP）结合使用的方案，以有效利用中温热水（80–100°C）。这些技术显示出将这种水用于发电的潜力。对在中温水上运行的GeoPP和GCP进行了比较分析，这表明了后者的优势。根据计算，在Makhachkala镇的Thernair场实施混合技术将使发电厂的产能达到60 MW。示出了高温地热盐水的综合处理的前景。给出了技术图，其中在单元中使用了二进制GeoPP产生的电来提取化学成分。给出了Berikey地热场的估计参数。事实证明，Berikey油田热盐水的探明储量有望使年产量超过2000吨碳酸锂。提出了塔鲁莫夫卡地热田高温地热盐水综合处理的前景。可以使用低沸点工作剂在二元地热发电厂中将地热盐水的热能转换为电能。已经考虑在不同的工作剂异丁烷蒸发温度下，在GeoPP的二次回路中实现了兰金热力学循环。_e  ＝ 5.0MPa。GeoPP产生的低温废盐水将进入化工厂，根据我们开发的技术将主要的化学成分碳酸锂，氧化镁，碳酸钙和氯化钠提取出来，以综合利用热液盐水。为了生产有价值的无机材料，可以使用GeoPP产生的电。优先处理在达吉斯坦北部的Yuzhno-Sukhokumsk组油气井的相关高盐盐水中得到了优先处理。目前，放射性本底超过允许标准的相关盐水被倾倒到地面过滤场上。已经提出了对其去污和开发的技术解决方案。