CLAY-FREE DRILLING FLUID FOR EXPOSING PRODUCTIVE FORMATIONS

CLAY-FREE DRILLING FLUID FOR EXPOSING PRODUCTIVE FORMATIONS

oil and gas production. SUBSTANCE: clay-free drilling fluid used as washing fluid when exposing productive formations contains 0.3-1.8 % of xanthane series biopolymer, 0.3-3.0% of associative binary product, in particular polyalkylene glycol component, and water. Polyalkylene glycol component more p...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BELENKO E.V, KUKSOV V.A, RASTEGAEV B.A, PEN'KOV A.I, KOSHELEV V.N, VAKHRUSHEV L.P
Format: Patent
Sprache:eng ; rus
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Beschreibung
Zusammenfassung:oil and gas production. SUBSTANCE: clay-free drilling fluid used as washing fluid when exposing productive formations contains 0.3-1.8 % of xanthane series biopolymer, 0.3-3.0% of associative binary product, in particular polyalkylene glycol component, and water. Polyalkylene glycol component more particularly consists of water-soluble ethylene oxide/propylene oxide copolymer with at least 85 mol % ethylene oxide and oil-soluble ethylene oxide/propylene oxide copolymer with no more than 15 mol % ethylene oxide at their ratio from 1:1 to 1:3. Fluid may also contain filtration reducer, clay swelling inhibitor, biocyde, mudding agent, and weightening agent. EFFECT: reduced filtration characteristics, increased clay rock inhibition efficiency, and improved surfactant and waterproofing properties. 6 cl, 5 tbl, 4 ex