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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Determination of Residual Oil Saturation in A Carbonate Reservoir
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Determination of Residual Oil Saturation in A Carbonate Reservoir

机译：碳酸盐岩储层中剩余油饱和度的测定

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Single-well tracer testing has been widely accepted as arnstandard method for measuring residual oil saturation tornwaterflood. Residual oil saturation is an importantrnparameter in the evaluation of tertiary oil recoveryrnpotential for depleted reservoirs. At an advanced stage ofrndepletion, Leduc, a Canadian carbonate reservoir, hasrnbeen considered as a candidate for enhanced oilrnrecovery. As part of the evaluation process, single-wellrntracer tests were conducted at two watered-out producersrnto determine residual oil saturation to waterflood. Therntracer production profiles were found to be highlyrnskewed with long tails and early arrival times, which arerntypical for carbonate reservoirs. Two different models,rnnamely a double-porosity model where tracer couldrndistribute between the flowing and non-flowing poresrnthrough mass transfer and a single-porosity model whererna fictitious water drift rate was assumed in the test zone,rnwere used to interpret the data. It was found that eitherrnmodel could match the data to the same degree ofrnaccuracy regardless of the flow mechanisms assumedrnand the residual oil saturation derived from these twornmodels were 35% and 38% respectively. Thisrndemonstrates the robust nature of the test that the nonuniquenessrnof the match does not affect residual oilrnsaturation determination. The residual oil saturationrndetermined by simple analytical models including massrnbalance method, peak method and mean retentionrnvolume method were all in the range of 34% to 38%, inrnexcellent agreement with the simulation results. Asrnwell, the Sorw obtained by the SWTT method comparedrnfavorably with those determined by interwell tracingrn(35%) and sponge coring (33%).
机译：单井示踪剂测试已被广泛用作测量残油饱和度的标准方法。剩余油饱和度是评价枯竭油层三次采油潜力的重要参数。在枯竭的晚期，加拿大碳酸盐岩储层Leduc被认为是提高石油采收率的候选者。作为评估过程的一部分，在两个断水的生产商进行了单井示踪剂测试，以确定注水的残余油饱和度。示踪剂的生产剖面高度偏斜，尾部较长，到达时间较早，这对于碳酸盐岩储层来说是典型的。两种不同的模型，分别是示踪剂可以通过传质在流动的和非流动的孔隙之间分布的双重孔隙模型，以及在测试区域中假设虚拟水漂移率的单孔隙模型，用来解释数据。结果发现，无论采用哪种流动机理，任何一个模型都可以将数据匹配到相同程度的精度，并且从这两个模型得出的剩余油饱和度分别为35％和38％。这证明了匹配的非唯一性不会影响残留油饱和度确定的测试的鲁棒性。通过简单的分析模型确定的剩余油饱和度，包括质量平衡法，峰值法和平均保留体积法都在34％到38％的范围内，与模拟结果非常吻合。用SWTT法测得的Sorw与用井间示踪法（35％）和海绵取芯法（33％）测得的Sorw比较好。

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