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2 254 353

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(51)

IPC

(21) (22)

Application

2004102789/03, 2004-01-30

(24)

Start date

2004-01-30

(22)

Actual filing date

2004-01-30

(45)

Published

2005-06-20

(72)

Inventor

Kashkarov N.G.Verkhovskaja N.N.Konovalov E.A.Shumilkina O.V.Grosheva T.A.Usynin A.F.

(73)

Holder

Obshchestvo S Ogranichennoj Otvetstvennost'Ju

DRILLING MUD FOR BORING PERMAFROST Russian patent published in 2005 - IPC

Abstract RU 2254353 C1

FIELD: drilling engineering.

SUBSTANCE: drilling mud is composed of 2-4% bentonite mud powder, 0.02-0.06% water-soluble polymer "Praestol 2530", 0.25-0.4% high-viscosity polyanionic cellulose (Drispac) serving as additive improving resistance of drilling mud against mechanic destruction and salts, and 95.73-97.54% water.

EFFECT: increased stability and ability to reduce permafrost thaw during drilling at positive temperature.

1 dwg, 1 tbl

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RU 2 254 353 C1

Authors

Kashkarov N.G.

Verkhovskaja N.N.

Konovalov E.A.

Shumilkina O.V.

Grosheva T.A.

Usynin A.F.

Dates

2005-06-20—Published

2004-01-30—Filed