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Application

98123236/03, 1998-12-21

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Start date

1998-12-21

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Actual filing date

1998-12-21

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Published

2001-02-27

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Inventor

Pen'Kov A.I.Vakhrushev L.P.Koshelev V.N.Rastegaev B.A.Belenko E.V.

(73)

Holder

Pen'Kov Aleksandr IvanovichVakhrushev Leonid PetrovichKoshelev Vladimir NikolaevichRastegaev Boris AleksandrovichBelenko Evgenij Vladimirovich

DRILLING MUD Russian patent published in 2001 - IPC

Abstract RU 2163614 C2

FIELD: drilling fluids. SUBSTANCE: water-based drilling mud contains, %: polyalkylene glycol, 1-5; clay, 3-15; and stabilization reagent, 0.5-5. The latter can be represented by anionic and nonionic polymers, lignosulfonates and their derivatives. Novelty resides in that polyalkylene glycol is ethylene oxide/propylene oxide copolymer depicted by following structural formula , wherein X is O, N, or CH2; Y is N or CH2; c, a, b =0-2; t, q, g, m, k vary from 0 to 250; d =1-5; R1,R2,R3 are H or methyl; A, B, and G vary from 1 to 120; and 3<(a+b+c)<5; with molecular weight within a range of 370 to 40000 g/mole; or mixtures of such polyalkylene glycols. EFFECT: improved surfactant properties, resistance to alkali-earth metal salts, reduced friction and filtration coefficient values, and also reduced initial rate of moistening of clayey minerals within a vide temperature range. 11 tbl

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RU 2 163 614 C2

Authors

Pen'Kov A.I.

Vakhrushev L.P.

Koshelev V.N.

Rastegaev B.A.

Belenko E.V.

Dates

2001-02-27—Published

1998-12-21—Filed

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