Visualization of the interactions between CO2 and Lloydminster Heavy Oil under Non-equilibrium Conditions

非平衡条件下二氧化碳与劳埃德明斯特重油相互作用的可视化

• 批准号: 521820-2018
• 负责人: Dehghanpour, Hassan
• 金额: $ 1.82万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=648924
• 关键词: Visualization; interactions; between; CO2; Lloydminster

Heavy oil represents about 15 percent of world hydrocarbon reserves, and up to 70 percent of total world**hydrocarbon reserve if including extra heavy and bitumen. Majority of the oil production in Canada is from the**Western Basin with the dominant of oil sands/bitumen and heavy oil. Various techniques have been in place to**develop these enormous resources and can broadly be classified in thermal (steam-based flooding and**non-thermal methods (chemical-based flooding).**The production of Lloydminster heavy oil has its long tradition dated back to the early 20th century. The oil**gravities are considerably low, ranging from 10 to 12 deg. API, and in the promising range for non-thermal**Enhanced Oil Recovery (EOR) applications. Carbon dioxide (CO2) gas is present in the atmosphere at a**concentration of 0.03 percent and has been used for decades in the oil and gas industry for EOR. For most of**the petroleum applications, CO2 exists either as a gas or as a supercritical fluid, i.e., a fluid with the density**close to that of a liquid but volume-filling like a gas. Considering the Lloydminster reservoir pressure (500 psi)**and temperatures (15 deg. C), the CO2 likely exists in the gas state where it may undergo dissolution with oil**resulting in oil swelling, oil-viscosity reduction and vaporization of intermediate to heavy components. The**objective of this proposed study is to visualize the CO2/oil interactions at reservoir conditions. A series of**laboratory experiments are to be conducted in a custom-designed cell with oil samples taken from the**Lloydminster formation. The experimental results give more clues on 1) The interactions at the CO2/oil**interface and volume changes at reservoir conditions, and 2) Asphaltene precipitation as a result of CO2**dissolution in oil.**The results of this research will offer the industry an alternative to enhance the oil production in the**Lloydminster formation and ultimately contribute to reducing greenhouse gas emission.

重油约占世界碳氢化合物储量的 15%，如果包括超重质和沥青，则高达世界**碳氢化合物总储量的 70%。加拿大的大部分石油产量来自**西部盆地，以油砂/沥青和重油为主。已经采用了各种技术来**开发这些巨大的资源，大致可分为热法（蒸汽驱）和**非热法（化学驱）。**劳埃德明斯特重油的生产有着悠久的传统，可以追溯到 20 世纪初。石油**比重相当低，API 为 10 至 12 度，处于非热法**提高石油采收率的有希望的范围内 （提高采收率）申请。二氧化碳 (CO2) 气体在大气中的浓度为 0.03%，几十年来一直用于石油和天然气行业的 EOR。对于大多数石油应用来说，二氧化碳要么以气体形式存在，要么以超临界流体的形式存在，即密度接近液体但具有像气体一样充满体积的流体。考虑到 在劳埃德明斯特储层压力 (500 psi)** 和温度 (15 ℃) 下，CO2 可能以气态存在，可能会与油溶解**，导致油膨胀、油粘度降低以及中质组分到重组分的蒸发。这项研究的**目标是可视化油藏条件下二氧化碳/石油的相互作用。一系列**实验室实验 将在定制设计的单元中进行，油样取自**劳埃德明斯特地层。实验结果提供了更多线索：1) CO2/石油**界面的相互作用和油藏条件下的体积变化，以及 2) CO2**溶解在石油中导致的沥青质沉淀。**这项研究的结果将为业界提供一种提高石油产量的替代方案。 **劳埃德明斯特形成并最终有助于减少温室气体排放。