CONTROL OF EQUIVALENT CIRCULATING DENSITY (ECD) AT DEEP WATER DRILLING

摘要

FIELD: oil and gas industry.;SUBSTANCE: invention is related to oil well drilling. The method for provision of substantially permanent mud flow characteristics within the temperature range from about 120°F (49°C) up to about 40°F (4°C) includes addition to drilling mud of an additive that contains the product of carboxylic acid reaction having at least two carboxyl fragments and polyamine with at least two functional amine groups provided that the additive does not contain alkoxylated alkylamides and/or amides of fatty acids. The composition consists of the product of carboxylic acid reaction having at least two carboxyl fragments and polyamine with at least two functional amine groups provided that the additive does not contain alkoxylated alkylamides and/or amides of fatty acids. The oil-based drilling mud contains the above composition.;EFFECT: improving efficiency of rheology regulation within the wide temperature range for horizontal drilling and deep water areas.;47 cl, 4 ex, 5 tbl