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Associative polymer-based fluids for enhanced oil recovery using produced saline water

用于使用采出盐水提高石油采收率的缔合聚合物液体

基本信息

批准号：
RGPIN-2020-05951
负责人：
Trivedi, Japan
金额：
$ 3.35万
依托单位：
University of Alberta
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2022
资助国家：
加拿大
起止时间：
2022-01-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749116
关键词：
Associative polymer based fluids enhanced

项目摘要

In Canada, chemical flooding is currently being applied to increase recovery from a number of medium and heavy oil pools in the Lloydminster region of eastern Alberta and western Saskatchewan. According to the Government of Alberta's Innovative Energy Technologies Program, chemical-enhanced oil recovery (cEOR) could potentially add 80 million m3 of oil to Alberta and Saskatchewan's reserves in the next 20 years. While in the U.S.A. alone approximately 1 billion pounds of polymers were used for cEOR, the potential of chemical flooding in unconventional tight oil remain largely unexplored. In cEOR operations, various chemicals such as polymers, surfactants, alkali or combinations thereof are injected into wells to increase oil recovery. However, different reservoir operating conditions (e.g. pH, temperature, salinity, dissolved iron and oxygen, and presence of alkali and/or surfactant) affect polymer structure and size. Water-soluble polymers with a small amount of hydrophobic character (referred to as Associative Polymers) have huge potential for EOR efficiency even with produced or saline water. Despite selective success in laboratory research in recent years, a comprehensive and predictive knowledge to answer key questions remains elusive. This proposal focuses on understanding mechanisms during associative polymer flooding for applications in conventional and tight oil reservoirs and creating a predictive model. Saline water and smart water can have a positive effect on associative polymer injectivity and transport properties due to polymer coil expansion. Synergistic effects between associative polymer, surfactants, and ionic interactions can lead to increased EOR efficiency even for carbonate reservoirs. The mechanism due to associative polymeric flooding and the salinity effect haven't been clearly distinguished; therefore, optimal design cannot be achieved. Moreover, the conventional capillary number calculated using the shear viscosity and apparent viscosity does not explain the various residual oil recovery shown by these associative viscoelastic polymer solutions at different salinity. Also, rapid oil mobilization for viscoelastic polymers begins to occur at a capillary number lower than the critical capillary number. Therefore, there is a strong need to re-establish capillary concept by modifying the conventional definition of capillary number and developing a capillary desaturation curve for viscoelastic associative polymer--based fluids. In summary, the synergistic effects between ionic solution, hydrophobic group contents and surfactants have huge potential influences viscosity and extensional properties and/or wettability, besides other mechanisms, and thereby EOR and fracking efficiency. The proposed research program will address key technological gaps in EOR using associative polymer based fluids.

在加拿大，化学驱油目前正用于提高阿尔伯塔东部和萨斯喀彻温省西部阿尔伯塔地区一些中型和重型油藏的采收率。根据阿尔伯塔政府的创新能源技术计划，化学强化采油（cEOR）可能会在未来20年内为阿尔伯塔和萨斯喀彻温省增加8000万立方米的石油储量。虽然仅在美国就有大约10亿磅聚合物用于cEOR，但在非常规致密油中化学驱的潜力仍在很大程度上未被开发。在cEOR操作中，将各种化学品如聚合物、表面活性剂、碱或其组合注入威尔斯井中以提高油采收率。然而，不同的储层操作条件（例如pH、温度、盐度、溶解的铁和氧以及碱和/或表面活性剂的存在）影响聚合物结构和尺寸。具有少量疏水特性的水溶性聚合物（称为缔合聚合物）即使在采出水或盐水的情况下也具有EOR效率的巨大潜力。尽管近年来在实验室研究中取得了选择性的成功，但回答关键问题的全面和预测性知识仍然难以捉摸。该建议的重点是了解缔合聚合物驱在常规和致密油藏中应用的机理，并建立预测模型。由于聚合物线团膨胀，盐水和智能水可以对缔合聚合物的注入性和输送性质具有积极影响。缔合聚合物、表面活性剂和离子相互作用之间的协同效应可以导致甚至对于碳酸盐岩储层提高的EOR效率。缔合聚合物驱油机理和矿化度效应尚未明确区分，因此无法进行优化设计。此外，用剪切粘度和表观粘度计算的常规毛细管数不能解释这些缔合粘弹性聚合物溶液在不同矿化度下显示的不同的残余油采收率。此外，粘弹性聚合物的快速油动员开始发生在低于临界毛细管数的毛细管数。因此，有一个强烈的需要，重新建立毛细管的概念，通过修改毛细管数的传统定义和开发的粘弹性缔合聚合物基流体的毛细管去饱和曲线。总之，离子溶液、疏水基团含量和表面活性剂之间的协同效应具有巨大的潜在影响粘度和延伸性质和/或润湿性，以及其他机制，从而影响EOR和压裂效率。拟议的研究计划将解决使用缔合聚合物基流体提高采收率的关键技术差距。