Colloid and surface interaction understanding in warm lime softening of SAGD produced water treatment

SAGD 采出水处理中温石灰软化中胶体和表面相互作用的理解

• 批准号: 522295-2017
• 负责人: Lu, Qingye
• 金额: $ 1.82万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640578
• 关键词: Colloid; surface; interaction; understanding; warm

Suncor uses both surface mining and steam-assisted gravity drainage (SAGD) to recover bitumen. In SAGDoperations, almost all the steam injected is recovered as produced water at the surface. It is highly desirable torecycle the maximum possible amount of water of SAGD process to reduce operational costs and overall waterconsumption. The percentage of produced water recycled depends on the performance of the chemicaltreatment process consisting of a warm lime softening unit, an After Filter, and a weak acid cation exchangeunit. The chemical treatment of SAGD produced water is a complicated process with a lot of factorsinfluencing its performance. A wide range of colloid and interface science related phenomena are involved inSAGD produced water chemical treatment and need to be fundamentally understood. The basic understandingof these phenomena will lead to improved practice of SAGD produced water treatment. A series of jar testswill be carried out in synthetic waters to evaluate the impact of chemicals including type and dosage on thecoagulation of CaCO3 and Mg(OH)2 particles as well as total suspended solids (TSS) and total organic carbon(TOC) removal. By comparing the water characterization data of the synthetic waters before and aftertreatment, correlations will be constructed to correlate the performance of CaCO3 and Mg(OH)2 coagulationand TSS/TOC removal to chemicals species and dosage. The information obtained will be used to elucidate thecoagulation and removal mechanisms. Basic questions like how coagulant interacts with the feed TSS/TOC ofthe synthetic waters as well as formed CaCO3 and Mg(OH)2 particles will be answered.

森科尔使用露天采矿和蒸汽辅助重力排水(SAGD)来回收沥青。在SAGD作业中，几乎所有注入的蒸汽都在地表作为采出水回收。为了降低运行成本和总用水量，应尽可能地回收SAGD工艺的水。产出水的回收率取决于化学处理过程的性能，化学处理过程由温石灰软化单元、后过滤器和弱酸性阳离子交换单元组成。SAGD废水的化学处理是一个复杂的过程，影响其处理效果的因素很多。SAGD采出水化学处理涉及广泛的胶体和界面科学现象，需要从根本上加以理解。对这些现象的基本认识将有助于改进SAGD采出水的处理实践。将在合成水中进行一系列的烧杯试验，以评估化学剂的类型和投加量对CaCO3和Mg(OH)2颗粒的混凝以及总悬浮固体(TSS)和总有机碳(TOC)去除的影响。通过比较处理前后合成水的水质特性数据，建立了CaCO3和Mg(OH)2的混凝性能和TSS/TOC去除与药剂种类和投加量之间的关联式。所获得的信息将被用来阐明混凝和去除机理。基本问题，如混凝剂如何与合成水的进水TSS/TOC相互作用，以及形成CaCO3和Mg(OH)2颗粒等。