METHOD OF SEALING THE CASING STRING-BOREHOLE ANNULUS

repair and sealing operations on wells of oil and gas deposits, particularly, methods of recovery of seal of casing-string-borehole annulus. SUBSTANCE: method consists in treatment of casing string in interval of securing of casing string-borehole annulus with variable polarity of electric current w...

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Main Authors DZHAFAROV I.S, SHATSKIJ A.V, BREKHUNTSOV A.M, GORBUNOV M.P, KHISMETOV T.V, BARANOV V.B, SHARIFULLIN F.A
Format Patent
LanguageEnglish
Published 10.04.2001
Edition7
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:repair and sealing operations on wells of oil and gas deposits, particularly, methods of recovery of seal of casing-string-borehole annulus. SUBSTANCE: method consists in treatment of casing string in interval of securing of casing string-borehole annulus with variable polarity of electric current with its density of 20-40 A/sq.m. Simultaneously, treatment is additionally carried out with variable polarity electric current and its periodically varying density from 1 to 20 A/sq.m. In doing so, time for treatment with current of positive polarity exceeds that for treatment with current of negative polarity. EFFECT: higher efficiency of sealing of casing string-borehole annulus and elimination of flows-over in casing string-borehole annulus. 2 dwg, 1 ex
Bibliography:Application Number: RU20000124576