Investigation of Rock Wettability Alteration by Carbonated Water through Contact Angle Measurements
Investigation of Rock Wettability Alteration by Carbonated Water through Contact Angle Measurements
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DOI：
10.1021/acs.energyfuels.5b01069
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发表时间：
2015-08
期刊：
影响因子：
5.3
通讯作者：
M. Seyyedi;M. Sohrabi;A. Farzaneh
中科院分区：
文献类型：
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作者：
M. Seyyedi;M. Sohrabi;A. Farzaneh
与常规水驱相比，碳酸化（富含二氧化碳）注水已被证明可以改善水驱性能。碳酸水可以故意注入到油藏中，但在常规的CO2驱油或CO2水交替气（WAG）注入过程中，碳酸水也会自发形成。因此，当碳酸水与油和储层岩石接触时，了解油藏中发生的岩石-流体和流体-流体相互作用非常重要。由于CO2在盐水中的溶解，在碳酸水注入过程中，注入水的pH值降低。盐水pH值的降低可能会影响水岩界面上的电荷，因此可能会改变表面的润湿特性。这种润湿性变化将直接影响注水后的原油采收率和剩余油量。为了评估和量化由于水的碳酸化而可能导致的润湿性改变的程度，进行了一系列接触角测量。
Carbonated (CO2-enriched) water injection has been shown to improve waterflood performance over conventional water flooding. Carbonated water can be purposely injected in an oil reservoir, but it also forms spontaneously during conventional CO2 floods or CO2 water alternating gas (WAG) injection. It is therefore important to understand the rock–fluid and fluid–fluid interactions that take place in an oil reservoir when carbonated water contacts the oil and the reservoir rock. Because of dissolution of CO2 in brine, the pH of injection water is reduced during carbonated water injection. This reduction in brine pH may affect the electric charges on water–rock interfaces and, hence, may alter the wetting characteristics of the surface. This wettability alteration will have a direct effect on oil recovery and the amount of oil remaining after waterflood. To assess and quantify the extent of possible wettability alteration as a result of carbonation of water, a series of contact angle measurements have been pe...