A New Approach to Simulate Low Salinity Water Flooding in Carbonate Reservoir

Abdulla Aljaberi, M. Sohrabi
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引用次数: 1

Abstract

Low salinity water flooding (LSWF) as an enhanced oil recovery method (EOR) has attracted increased attention from oil companies due to its numerous benefits and advantages. It has been confirmed in several studies and laboratory experiments that LSWF has improved oil recovery. However, the underlying mechanism responsible for such an impact is still debatable. All previous studies focused on a geochemical process where fluid-fluid interaction has been overlooked. Recently, some studies have indicated that brine-crude oil (micro-dispersion) interactions play dominant roles in improved oil recovery in carbonate rocks. Nevertheless, at the moment, no commercial simulator can mimic this mechanism from the perspective of fluid interactions. In this work, we investigated whether micro-dispersion is applicable in commercial reservoir simulators through the history matching of two carbonate coreflood experiments. In this part of the investigation, three aspects will be addressed. (i) Develop a correlation of the link between the mechanism (micro-dispersion) in the lab and numerical simulation. (ii) Predict the low salinity relative permeability curves. (iii) History match the experimental data. This paper presents an integrated method of simulating low salinity water floods in carbonate rocks. Two different approaches have been applied to the history matching of unsteady state coreflood experiments. First, numerical simulation was performed to extract the high salinity relative permeability curves (KrHS) of the secondary mode for both experiments. Then, the findings from the first approach and the experimental results were used to develop a new approach for predicting the low salinity relative permeability (KrLS) curves. The new approach was not only used to predict KrLs curves through micro-dispersion but also used as input to history match the tertiary low salinity water floods. An excellent match was obtained using both the numerical simulation model and the new approach for the oil recovery and pressure drop profile, where two different relative permeability sets were generated in this study for each coreflood. The first observation promotes the premise that a history match of a coreflood can be obtained using different sets of relative permeability curves. In contrast, the Corey exponents, residual oil saturations and endpoints are essential parameters in the history matching of LSWF. The results obtained in this study will help to understand the modelling process involved during oil recovery by LSWF and introduce a new approach to model the effect of LSWF.
碳酸盐岩油藏低矿化度水驱模拟新方法
低矿化度水驱(LSWF)作为一种提高采收率(EOR)的方法,由于其众多的优点和优势,越来越受到石油公司的关注。一些研究和实验室实验已经证实,LSWF提高了原油采收率。然而,造成这种影响的潜在机制仍存在争议。以前所有的研究都集中在地球化学过程上,流体-流体相互作用被忽视了。近年来,一些研究表明,盐水-原油(微分散)相互作用在提高碳酸盐岩采收率中起主导作用。然而,目前还没有商业模拟器可以从流体相互作用的角度模拟这种机制。在这项工作中,我们通过两次碳酸盐岩岩心驱油实验的历史匹配,研究了微分散是否适用于商业油藏模拟器。在这一部分的调查中,将涉及三个方面。(i)将实验室的机制(微分散)与数值模拟之间的联系联系起来。预测低矿化度相对渗透率曲线。(iii)历史与实验数据吻合。提出了一种综合模拟碳酸盐岩低矿化度水驱的方法。两种不同的方法被应用于非稳态岩心驱油实验的历史拟合。首先,通过数值模拟提取两种实验的二次模式高盐度相对渗透率曲线(KrHS);然后,将第一种方法的发现与实验结果相结合,建立了预测低矿化度相对渗透率(KrLS)曲线的新方法。该方法不仅可以通过微分散预测KrLs曲线,还可以作为第三系低矿化度水驱历史拟合的输入。利用数值模拟模型和新方法对采收率和压降剖面进行了很好的拟合,在该研究中,每次岩心注水都生成了两个不同的相对渗透率集。第一次观测提出了一个前提,即可以使用不同的相对渗透率曲线集来获得岩心注水的历史匹配。相比之下,Corey指数、剩余油饱和度和端点是LSWF历史拟合的重要参数。本研究的结果将有助于理解LSWF采油过程中涉及的建模过程,并引入一种新的方法来模拟LSWF的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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