CLAYLESS DRILLING MUD FOR CONTROLLED DIRECTIONAL AND HORIZONTAL HOLES AND FOR EXPOSING PRODUCTIVE FORMATIONS (VERSIONS) Russian patent published in 2002 - IPC

Abstract RU 2186820 C1

FIELD: oil and gas production and drilling fluids. SUBSTANCE: water-based drilling mud contains, wt. %: starch, 0.5-2.5; sodium hydroxide, 0.04-0.2; water-soluble boron compound, 0.4-1.5; and can additionally contain water-soluble silicic acid salt, 0.1-0.6; and carbonate weighing agent, 10-15. According to another embodiment of invention, drilling mud contains, wt. %: starch, 0.5-2.5; multianionic cellulose, 0.1-0.3; sodium hydroxide, 0.04-0.2; surfactant, 0.3-1.0; water-soluble boron compound, 0.4-1.5; and can additionally contain water-soluble silicic acid salt, 0.1-0.6; and carbonate weighing agent, 5-25. EFFECT: lowered consistence values and raised values of rigidity and encapsulation property with no loss in lubricating ability, heat and biological resistance, and reservoir properties. 6 cl, 2 tbl, 2 ex

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RU 2 186 820 C1

Authors

Natsepinskaja A.M.

Garshina O.V.

Tataurov V.G.

Fefelov Ju.V.

Grebneva F.N.

Karasev D.V.

Serebrjakov V.A.

Dates

2002-08-10Published

2001-05-23Filed