WEIGHTED DRILLING MUD Russian patent published in 2004 - IPC

FIELD: oil and gas production.

SUBSTANCE: invention relates to drilling fluids used under complicated boring conditions, for instance when boring exploratory and productive holes under abnormally high pressure and temperature conditions. For these cases, weighted drilling mud contains, wt %: clay 5-10, stabilizing carboxymethylcellulose reagent 0.2-0.3, potassium chloride 3-5, potassium hydroxide 0.2-0.3. plasticizer 0.2-0.3, barite 30-65, lubricating additive 0.3-0.5. flocculant (unifloc or praestol) 0.001-0.004, and water - the balance.

EFFECT: improved quality due to lower filtration and improved rheological and structurally-mechanical properties of drilling mud.

2 tbl, 3 ex