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Depressurizing oil reservoirs for SAGD

机译:SAGD减压储油罐

摘要

A proposed methodology to startup wells with electrical downhole heating as a preconditioning method for a steam injection process. The downhole electrical heating recovers oil which results in a reduction in the reservoir pressure. Once oil has been recovered for a period of time and the operating pressure and temperature has been reduced, SAGD well pairs are provided between the downhole heater wells, and SAGD or a SAGD-like method used to produce oil. The method reduces heat losses due to steam injection at lower pressure and temperature and therefore, improves efficiency and lowers operating costs. Operating at lower pressure and temperature will also reduce the risk of melting the permafrost and consequent well failure issues. When oil production drops below an economical level, remaining oil can be collected at the DHH wells using the SAGD wellpair for gas or solvent or steam sweeps, or combinations thereof.
机译:一种提议的方法,通过井下电加热来启动井,作为注蒸汽过程的预处理方法。井下电加热可回收油,从而降低储层压力。一旦在一段时间内回收了石油并且降低了工作压力和温度,就在井下加热器井之间提供了SAGD井对,并使用SAGD或类似SAGD的方法生产石油。该方法减少了由于在较低压力和温度下注入蒸汽而产生的热损失,因此提高了效率并降低了运行成本。在较低的压力和温度下操作还将减少融化永冻土的风险以及随之而来的油井故障问题。当采油量降至经济水平以下时,可以使用SAGD井对在DHH井中收集剩余的油,以进行气体或溶剂或蒸汽吹扫,或其组合。

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