Geothermal Energy Production from Oil and Gas Wells
Abstract: This Thesis presents an investigation of geothermal energy production and utilization for electricity generation on the petroleum fields. According to the global energy market in Russia, the leading position takes oil and gas industry. Experts say that most of large petroleum deposits are depleted and the water cut reaches up to 80-90%. To develop such fields and deposits is not economic attractive, that is why wells with high water cut, more than 95%, are turned into abandoned wells. The technology of obtaining geothermal energy from abandoned wells allows reusing already drilled deep wells to generate electricity in an environmentally friendly way. It is especially relevant in oilfields isolated from the grids. In this work the scheme of geothermal energy extraction and utilization is presented. Based on the knowledge of heat exchange in a well and foreign experience a mathematical model describing heat exchange between injected fluid and surrounding rocks in a double pipe was developed. Apart from that the main factors affecting the efficiency of geothermal heat extraction and electricity generation were thoroughly examined. Furthermore, the economic and ecological effect from electricity production by ORC was defined.
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