UNSTRUCTURED WASHING BUFFER FLUID FOR POLYCATIONIC DRILLING FLUIDS Russian patent published in 2024 - IPC C09K8/40 C09K8/52 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to spacer fluids used for separation of grouting and drilling muds, dispersion and removal of polycationic clay crust of drilling mud from rock and film of polycationic drilling mud from casing during well cementing. Unstructured detergent buffer liquid for polycationic drilling mud contains water, soda ash, triethanolamine and sodium percarbonate in the following ratio of components, wt.%: sodium percarbonate 3.00-4.50; soda ash 0.08-0.11; triethanolamine 0.30-0.45; water – 94.94-96.62.

EFFECT: improving efficiency of washing of filtration clay cake of drilling mud from walls of wells and film of drilling mud from casing pipes.

1 cl, 1 tbl, 7 ex