Abstract
Development and utilization of deep geothermal resources, especially a hot dry rock (HDR) geothermal resource, is beneficial for both economic and environmental consideration in oilfields. This study used data from multiple sources to assess the geothermal energy resource in the Daqing Oilfield. The temperature logs in boreholes (both shallow water wells and deep boreholes) and the drilling stem test temperature were used to create isothermal maps in depths. Upon the temperature field and thermophysical parameters of strata, the heat content was calculated by 1 km × 1 km × 0.1 km cells. The result shows that in the southeastern part of Daqing Oilfield, the temperature can reach 150 °C at a depth of 3 km. The heat content within 3–5 km is 24.28 × 1021 J, wherein 68.2% exceeded 150 °C. If the recovery factor was given by 2% and the lower limit of temperature was set to be 150 °C, the most conservative estimate for recoverable HDR geothermal resource was 0.33 × 1021 J. The uncertainties of the estimation are mainly contributed to by the temperature extrapolation and the physical parameter selections.
Highlights
Geothermal energy coexisting with oil and gas started to be utilized, initially for house warming and vegetable greenhouse, in the early 1970s in the Huabei Oilfield [1,2,3]
The development of enhanced geothermal system (EGS) technology has extended to the realm of geothermal resources, e.g., hot dry rock (HDR) geothermal resource
The geothermal resource base is the heat content of the targeted medium calculated by Equation (6) [40,41]: Q = $ × Cp × V × (T − Tc) where $ represents rock density, Cp represents rock specific heat, V is rock volume, T is rock temperature at a specific depth, and Tc refers to the average surface temperature or specific reference temperature
Summary
Geothermal energy coexisting with oil and gas started to be utilized, initially for house warming and vegetable greenhouse, in the early 1970s in the Huabei Oilfield [1,2,3]. Since 2000, oilfields of Daqing, Shengli, and Liaohe have put efforts into geothermal energy utilization, and even further, attempted to produce electricity by low–medium temperature fluids (with the temperature lower than 150 ◦ C) [4,5]. The main benefits to developing HDR in oilfields are that utilization of HDR is already largely in place and little additional investment is required [6,7,8,9]. Because of this reduced exploration and drilling cost, development of HDR geothermal energy in oilfields can become cost competitive.
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