Geothermal Resources and Utilization in Oilfields
WANG Shejiao, YAN Jiahong, WANG Kaihong, REN Hengtai, HU Junwen
China’s oil companies have long attached importance to the development and utilization of geothermal energy in oilfields. In order to exploit and utilize geothermal energy effectively, it is very important to know about the potential and distribution of geothermal resources in oilfields. In this paper, the authors systematically evaluated the hydrothermal geothermal resources up to a depth of 4,000m in China’s main oil-gas basins based on a large number of well drilling and rock thermo physical properties testing data. The results showed that the geothermal resources in China's oilfields are large, and medium-low temperature hydrothermal geothermal resources are equivalent to 1084.5 billion tons of standard coal, with an annual production capacity of 1.617 billion tons of standard coal. High-quality geothermal resources are mainly concentrated in Bohai Bay, Songliao and Subei basins in eastern China. Huabei, Dagang, Jidong and Liaohe oilfields in Bohai Bay basin, Daqing and Jilin oilfields in Songliao basin and Zhejiang oilfield in Subei basin enjoy the best economic efficiency of development and utilization with high geothermal gradient, abundant geothermal resources and shallow burial (mostly shallower than 3000 m). Oilfields in western China, such as Tarim, Xinjiang, Tuha and Southwest, have low degree of economy of exploitation and utilization due to their low geothermal gradient, although the amount of geothermal resources in oilfields is relatively large, but the abundance of resources is small, the burial depth is large (deeper than 3000 m). Direct utilization of geothermal resources runs firstly for oil -water separation, heavy oil production, oil -gas gathering and transportation, oil pipeline cleaning, building heating, hot spring bathing, agricultural breeding, etc. The second is geothermal power generation, geothermal water over 100 oC can be used for power generation for the production and life in oilfields. In the current period of China's vigorous development of clean low-carbon energy industry and the promotion of clean geothermal energy heating, the exploitation and utilization of geothermal resources in oilfields, especially the development of high-quality geothermal resources in oilfields in eastern China in line with the heat market, to meet the demand for clean heating in northern China, will promote the realization of energy conservation, emission reduction and clean energy development of oilfields, and accelerate the development of China's geothermal industry.
|        Topic: Heat from Oil/Gas/Coal Fields||Paper Number: 41003|