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湿式电加热技术已获得美国专利(专利号为6631761)。经实验室研究和油田数值模拟技术证明,该技术可以在蒸汽辅助重力泄油及蒸汽萃取工艺的初始阶段使用。它不同于传统的蒸汽循环方法来加热地层,即对注入井进行加热,然后通过热传导将热量传递到注入井和生产井之间的地层,而是通过电阻加热来实现对地层的加热。因为主要是依靠地层的电传导率,所以在加热过程中热能的传递是短时间的。此外,在湿式电加热的过程中要在井内注入盐水,使电阻加热产生的热量能更多地、更均匀地分布到两井间的地层。在实验室进行的研究和使用CMG软件中的STARS模块进行的数值模拟都证实了以上的说法。为了评价该技术的经济效果,对两种类型的油藏进行了初步的经济分析,预测出该技术应用在SAGD中所获得的经济效益情况。这两种类型的油藏分别是Athabasca和冷湖/Lloydminster的重油油藏。分析表明:该技术的经济效益主要取决于油藏的特征以及两井间的垂直距离。
Wet electric heating technology has been the United States patent (Patent No. 6631761). Laboratory research and numerical simulation of oilfields have demonstrated that this technology can be used in the initial stages of steam assisted gravity drainage and steam extraction processes. It differs from the traditional steam cycle method to heat the formation, that is, the injection well is heated, then the heat is transferred to the formation between the injection well and the production well by heat conduction, but the formation is heated by resistance heating. Because it is mainly dependent on the electrical conductivity of the formation, the transfer of thermal energy is short-lived during the heating process. In addition, salt water is injected into the well during wet electric heating so that the heat generated by the resistance heating can be distributed more and more uniformly to the formation between the two wells. The above research was confirmed by research conducted in the laboratory and by numerical simulations using the STARS module in the CMG software. In order to evaluate the economic performance of this technology, a preliminary economic analysis of both types of reservoirs has been carried out to predict the economic benefits that this technology will have in SAGD. These two types of reservoirs are the Athabasca and Lloydminster heavy oil reservoirs, respectively. The analysis shows that the economic benefits of this technology depend mainly on the characteristics of the reservoir and the vertical distance between the two wells.