超高温纳米材料稳定泡沫实验研究

Experimental study on foam stabilization of ultra-high temperature nanomaterials

针对泡沫始于热力学不稳定体系、在地层条件下驱油效果不佳的问题,将片层纳米材料作为稳泡剂,应用于泡沫提高采收率中。首先通过测定气泡体积、析液半衰期确定纳米材料与实验室自制表面活性剂Y的最佳质量分数,并对表面活性剂Y的耐温性和耐盐性进行评价,再用电子显微镜观察泡沫液的微观形态,最后用岩心驱替实验评价驱替效果。结果表明,自制表面活性剂Y在350℃条件下老化2 h后仍具有优异的泡沫性能,且纳米材料可大幅度提高表面活性剂的稳泡性,复配体系较单一表面活性剂体系具有更强的稳定性,在350℃下驱替实验中表现出良好的封堵性能。片层纳米材料稳定泡沫的优异性能对提高采收率有重要意义。

Aiming at solving the problem that foam originates from thermodynamically unstable system and thus the inferior oil displacement effect under the formation condition,lamellar nanomaterials was applied as stabilizers to enhance oil recovery by foam.Firstly,the optimum mass fractions of the nanomaterials and the self-made surfactant Y were determined by measuring the bubble volume and the half-life of the solution.What’s more,the temperature and salt resistances of the surfactant Y were evaluated.Then the microscopic morphology of the foam was observed by electron microscope.Finally,the displacement effect was evaluated by core displacement experiment.The results show that the homemade surfactant Y still has excellent foam properties after aging at 350℃for 2 h,and the nanomaterials could greatly improve the foam stability of the surfactant.In addition,the composite system has stronger stability than the single surfactant system,and shows good plugging performance in the displacement experiment at 350℃.The excellent performance of lamellar nanomaterial stabilized foam is of great significance to enhance oil recovery.