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Field-Scale Numerical Simulation of SAGD Process With Top-Water Thief Zone

机译：顶水小偷带SAGD过程的现场规模数值模拟

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摘要

There is a major concern that the existence of thief zones suchrnas top water and/or gas cap overlying the oil sand deposit hasrna detrimental effect on the oil recovery in the application ofrnthe steam-assisted gravity drainage (SAGD) process Thernobjective of this numerical study is to investigate the SAGDrnperformance in the Athabasca oil sands in the presence of arntop water zone.rnThe reservoir model, STARS, developed by the ComputerrnModelling Group (CMG) Ltd. Has been previously validatedrnbased on a 3-D SAGD laboratory experiment with top waterrnthat was conducted at the Alberta Research Council (ARC). Itrnis believed that the numerical simulation captured the majorrnmechanism of oil movement from the pay zone into the toprnwater zone as observed in the experiment.rnIn the field-scale simulation, SAGD performance in thernpresence of confined and non-confined top water zones wasrninvestigated. The operating strategies under the conditions ofrnnon-depleted top wateron-depleted pay zones and depletedrntop wateron–depleted pay zones were considered. Numericalrnfindings indicated that: (1) there is detrimental effect of toprnwater zone on SAGD performance, (2) plugging of top waterrnzone with oil was not observed in this study for a top waterrnthickness of 8 meters, and (3) operating conditions that lead tornhigher pressure difference between the steam chamber and therntop water, either by depletion of the top water zone pressure orrna higher steam injection pressure, results in more detrimentalrneffect on the SAGD performance.
机译：值得关注的是，在蒸汽辅助重力排水（SAGD）工艺的应用中，覆盖油砂沉积物的贼层顶水和/或气顶对油的采收有不利影响。该数值研究的目的是在arntop水层存在的情况下研究阿萨巴斯卡油砂中SAGD的性能。在艾伯塔省研究理事会（ARC）。 Itrnis认为，该数值模拟捕获了实验中观察到的从产油区到顶水区的石油运移的主要机理。在田间规模模拟中，研究了在受限和非受限顶水区存在下的SAGD性能。考虑了在不枯竭的顶水/不枯竭的产油区和枯竭的顶水/非枯竭的产油区的条件下的经营策略。数值结果表明：（1）顶水带对SAGD性能有不利影响；（2）在顶水厚度为8米的情况下，本研究未观察到顶水带被油堵漏；（3）导致拉高的工作条件。蒸汽室与顶水之间的压力差，无论是通过顶水区压力的耗竭还是更高的蒸汽注入压力，都会对SAGD性能产生更大的不利影响。

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