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2 117 150

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C1

(51)

IPC

(21) (22)

Application

95105805/03, 1995-04-14

(22)

Actual filing date

1995-04-14

(45)

Published

1998-08-10

(72)

Inventor

Sultanov R.R.Ramazanov R.G.Shelepov V.V.

(73)

Holder

Nauchno-Proizvodstvennaja Firma

COMPOSITION FOR ACID TREATMENT OF BOTTOM ZONE OF FORMATION Russian patent published in 1998 - IPC

Abstract RU 2117150 C1

FIELD: oil and gas production. SUBSTANCE: invention consists in consecutively pumping in, into oil formation, edge of solvent for removing asphalt-tar and paraffin deposits (for particular oil field) and acid solution containing hydrofluoric acid and/or hydrochloric acid (95-99.5 wt % in sum) and a special reagent (0.5-5 wt %), weight ratio of solvent edge to acid solution ranging from 2: 1 to 0.5:1. EFFECT: enhanced efficiency. 3 cl, 3 tbl

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RU 2 117 150 C1

Authors

Sultanov R.R.

Ramazanov R.G.

Shelepov V.V.

Dates

1998-08-10—Published

1995-04-14—Filed

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