新型可循环泡沫钻井液用发泡剂性能研究

摘要

可循环泡沫钻井液可以通过稳定泡沫来实现,但需要占用较大的土地来消泡.为此,研制出一种新型pH敏感的可循环泡沫剂,并对其在泡沫钻井液中的应用效果进行了室内研究.结果表明:SDAA(长链烷基氨基二乙酸钠)和SDAP(长链烷基氨基二丙酸钠)两体系在pH反复从酸性到碱性的循环后,基液仍然能保持良好的起泡能力；在相同的气速下,SDAP、Betaine(甜菜碱)+聚合醇、泡沫剂(十二烷基苯磺酸钠)+稳泡剂(PVA)、SDAA+稳泡剂体系都具有较强的携液能力；SDAP体系的抗油能力强,泡沫可控循环次数在10次以上,且发泡能力仍然维持在较高水平.研究结果为泡沫钻井液可循环性提供了一个可能的方向.%Currently, the circulative foam drilling fluid can be obtained by stabilizing foam, but it need wide area to be defoamed. A novel pH sensitive circulative foaming agent is developed, and its application effect in foam drilling fluid is tested indoor. The results show that, two kinds of amphoteric ionic surfactants of SDAA ( sodium-N-dod-ecylaminoacetate ) and SDAP ( sodium-N-dod-propilaminoacetate ) have good foaming performance even after many circles of acid to alkaline and back to acid. The four systems have good liquid carrying capacity in the same gas velocity, including SDAP, Betaine + polyglycol, common frother + PVA, and SDAA + PVA. The SDAP system is a pH tunable system, which can be used at high oil contained conditions, and can realize the controllable circulation with the circulating time of higher than 10, maintaining higher foaming ability. This has provided a direction for adjustable circulative foam drilling fluids.