LIQUID FOR OIL AND GAS WELLS CONTROL AND CLEANOUT Russian patent published in 2017 - IPC C09K8/42 C09K8/48 C09K8/487 

FIELD: oil and gas industry.

SUBSTANCE: liquid for oil and gas wells control and cleanout, including biopolymer based on xanthan gum bioxane, filtration reducing agent, biocide and water, contains Polycell CMC, biocide - Remacid and additionally sodium formate, sodium hydroxide, diethanolamine, siderite as filtering reducer at the following proportions of components, mass %: Bioxane 0.3-0.8, Polycelle CMC 0.5-3.0, Remacid 0.1-0.2, sodium formate 10-40.0, sodium hydroxide 0.1-0.2, diethanolamine 2.0-20.0, siderite 5.0-20.0, water is the rest. The invention has been developed in dependent claim.

EFFECT: increasing scope of liquid for oil and gas wells control and cleanout at the fields in conditions of hydrogen sulfide, corrosive aggression and high temperatures with density control and improved structural and rheological properties.

2 cl, 1 ex, 1 tbl