AN IMPROVEMENT IN PLACING CEMENT SLURRY IN WELLS IN THE PRESENCE OF GEOLOGICAL ZONES CONTAINING SWELLING CLAYS OR MUD RESIDUES CONTAINING CLAYS

AN IMPROVEMENT IN PLACING CEMENT SLURRY IN WELLS IN THE PRESENCE OF GEOLOGICAL ZONES CONTAINING SWELLING CLAYS OR MUD RESIDUES CONTAINING CLAYS

Methods of treating wells for cementing operations and for improving placement of cement in wells containing water swelling clays include treatment of the well with a fluid containing clay precipitating agents capable of coagulating clays in the well. The coagulating fluid can contain quaternary amm...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: MAROY, PIERRE
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
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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Beschreibung
Zusammenfassung:Methods of treating wells for cementing operations and for improving placement of cement in wells containing water swelling clays include treatment of the well with a fluid containing clay precipitating agents capable of coagulating clays in the well. The coagulating fluid can contain quaternary ammonium salts, aqueous salts of potassium or cesium, or silicates as the clay coagulating agent. The coagulating fluids can be applied to convert soft mud cake into hard mud cake prior to placement of cement.