高盐条件下剩余油和润湿性对磺化聚合物在碳酸盐中的保留影响的研究

IF 3.2 3区 工程技术 Q1 ENGINEERING, PETROLEUM SPE Journal Pub Date : 2023-11-01 DOI:10.2118/207892-pa
Umar Alfazazi, Nithin Chacko Thomas, Emad Walid Al-Shalabi, Waleed AlAmeri
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引用次数: 0

摘要

碳酸盐岩储层的聚合物驱受聚合物滞留的影响很大,而聚合物滞留主要是由于聚合物与岩石表面相互作用的吸附作用。因此,这会导致聚合物前缘扩展和相关采收率响应的延迟。本文研究了在高盐度和中等温度条件下,残油(Sor)和润湿性对磺化基(ATBS)聚合物保留率的影响。在50°C的温度下,在24.3万ppm的高盐度盐水存在下,对露头碳酸盐岩岩心进行了聚合物单相和两相动态吸附试验以及整体和原位流变试验。对具有相似岩石物理性质的印第安纳石灰岩岩心样品进行了四次驱心试验。总的来说,聚合物的吸附性很低,在没有或存在Sor的情况下,聚合物的吸附性在可以接受的范围内。此外,聚合物吸附和原位流变学测试强调了岩心样品中石油存在的重要性,在没有和在Sor时,保留率分别为40-50µg/g-岩石和25-30µg/g-岩石。在油湿性更强的老化岩心样品上,保留率又降低了50%。采用双段塞和质量平衡技术测量聚合物的保留/吸附,两种方法的结果一致,差异小于7%。基于双段塞法计算的不可达孔隙体积(IPV)在23% ~ 28%之间,通过x射线计算机断层扫描(CT)扫描仪获得的原位饱和度监测结果定性支持了这一结果。基于atbs的聚合物在碳酸盐中表现出优异的应用效果,没有明显的聚合物漏失或堵塞。在CT原位饱和度监测的支持下,本文对残余油和润湿性对聚合物吸附的影响提供了有价值的见解,这对于避免油藏中不具代表性和膨胀的聚合物滞留是必要的。
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Investigation of the Effect of Residual Oil and Wettability on Sulfonated Polymer Retention in Carbonate under High-Salinity Conditions
Summary Polymer flooding in carbonate reservoirs is greatly affected by polymer retention, which is mainly due to adsorption by polymer-rock surface interactions. Consequently, this leads to a delay in polymer front propagation and related oil recovery response. This work investigates the effects of residual oil (Sor) and wettability on sulfonated-based (ATBS) polymer retention under the conditions of high salinity and moderate temperature. Polymer single- and two-phase dynamic adsorption tests as well as bulk and in-situ rheological experiments were conducted on outcrop carbonate cores in the presence of a high-salinity brine of 243,000 ppm at a temperature of 50°C. A total of four corefloods were conducted on Indiana limestone core samples with similar petrophysical properties. Overall, polymer adsorption was found to be low and within the acceptable range for application in carbonate reservoirs in the absence and presence of Sor. Furthermore, the polymer adsorption and in-situ rheology tests highlighted the significance of oil presence in the core samples, where retention was found to be around 40–50 µg/g-rock and 25–30 µg/g-rock in the absence and at Sor, respectively. An additional 50% reduction in retention was observed on the aged core sample that is more oil-wet. Polymer retention/adsorption was measured by double slug and mass balance techniques, and the results from both methods were in agreement with less than 7% difference. Inaccessible pore volume (IPV) was also calculated based on the double slug method and was found to be in the range of 23% to 28%, which was qualitatively supported by in-situ saturation monitoring obtained from an X-ray computed tomography (CT) scanner. The ATBS-based polymer showed excellent results for applications in carbonate without considerable polymer loss or plugging. This paper provides valuable insights into the impacts of residual oil and wettability on polymer adsorption, supported by CT in-situ saturation monitoring, which is necessary to avoid unrepresentative and inflated polymer retentions in oil reservoirs.
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来源期刊
SPE Journal
SPE Journal 工程技术-工程:石油
CiteScore
7.20
自引率
11.10%
发文量
229
审稿时长
4.5 months
期刊介绍: Covers theories and emerging concepts spanning all aspects of engineering for oil and gas exploration and production, including reservoir characterization, multiphase flow, drilling dynamics, well architecture, gas well deliverability, numerical simulation, enhanced oil recovery, CO2 sequestration, and benchmarking and performance indicators.
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