Processos de deslocar um primeiro líquido através de um tubo com um segundo líquido ao mesmo tempo em que se impede que os primeiro e segundo líquidos se misturem, e de cimentar um tubo suspenso em um furo de sondagem subterrâneo cheio com lama de perfuração

摘要

Improved method of cementing a pipe suspended in a subterranean well bore filled with drilling fluid comprises (a) forming the first liq. sepg. plug in-situ in the pipe by injecting a first self-thickening liq. and permitting the liq. to thicken into a first liq.-sepg. plug in the pipe prior to pumping the cement slurry; (b) pumping the cement slurry into the pipe and the drilling fluid into the annulus; (c) forming a second liq.-sepg. plug in-situ in the pipe by injecting a second self-thickening liq. and permitting the liq. to thicken into a second liq.-sepg. plug in the pipe prior to pumping the displacement liq. ; and (d) pumping the displacement liq. into the pipe and displacing the second plug to the bottom of the pipe, displacing the first plug into the annulus and displacing the cement slurry into the annulus.