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以流变学原理为基础,提出了控制接触污染的前置液紊流顶替理念。研究出了一种具备强抗钙能力和优良化学兼容性、流变参数可灵活调整、密度调节范围宽、能选择性固化的新型广谱水基前置液体系。冲洗液中含有磷酸盐类的稀释剂和络合剂、丹宁类稀释荆及纤维素类增粘剂,这3种双效主剂以一定比例复配,具有良好协同效能。隔离液采用重质碳酸钙、重晶石为加重剂,通过调节悬浮稳定剂和降滤失剂等外加剂的比例和加量来调控性能,并加有配伍性好的阴离子型抗钙表面活性剂,以抑制水泥中阳离子对隔离液体系的侵污。在隔离液基础上, 将加重材料替换为一种具有潜在水化活性的材料,通过激活剂的优选和采用膨润土预水化配制法,研制了可固化隔离液。提出优质前置液体系设计的关键在于体系化学处理荆的合理选择,它能使不同理化性能的流体相互之间具有良好的相容性,克服了采用传统顶替机理难以解决的流体污染后工程性能恶化引起的不良后果,为提高顶替效率提供了有利条件。该前置液体系对保证固井作业安全和提高层间封隔效果有广阔的应用前景。
On the basis of rheological principles, a concept of turbulence replacement for the control of contact pollution was proposed. A novel broad spectrum water based preflush system with strong resistance to calcium and good chemical compatibility, flexible rheological parameters adjustment, wide range of density adjustment and selective curing has been developed. The rinse solution contains phosphate diluents and complexing agents, tannin diluted Jing and cellulose thickener, the three double effect of the main agent in a certain proportion of compound, has a good synergistic effect. Isolation fluid using heavy calcium carbonate, barite as a weighting agent, by adjusting the suspension stabilizer and fluid loss additives and other additives in the proportion and dosage to regulate the performance, and with good compatibility of anionic anti-calcium surface activity Agent to inhibit the cement in the cation on the isolation fluid system invasion. On the basis of the sequestering liquid, the heavier material was replaced by a kind of material with potential hydration activity. Through the optimization of activator and the preparation method of pre-hydration by bentonite, a curable liquid separator was developed. The key to the design of high-quality preflush system lies in the rational choice of system chemical treatment. It can make the fluids with different physicochemical properties have good compatibility with each other, and overcome the engineering performance of the fluid after being contaminated by the traditional displacement mechanism The adverse consequences caused by the deterioration provide favorable conditions for improving replacement efficiency. The pre-fluid system has a broad application prospect to ensure the cementing operation safety and improve the effect of the interlayer seal.