BLANDING INNEHOLDENDE EN KAUSTISERT LIGNITT OG SULFONERT ASFALT FOR ANVENDELSE I BORESLAM, BORESLAM INNEHOLDENDE ENSLIK BLANDING, FREMGANGSMAATE TIL FREMSTILLING AV BLANDINGEN OG ANVENDELSE AV BLANDINGEN VED BROENNBORING

摘要

A well-working fluid such as a drilling mud containing a mixture of sulfonated asphalt and a causticized lignite. The use of the mixture gives a less expensive composition than would be the case with pure sulfonated asphalt and at the same time results in a higher quality fluid in that foaming is reduced and on balance the rheological properties are improved. The invention is of particular applicability in drilling muds using conventional ingredients such as clays and polymeric thickening agents such as CMC.