COMPLEX TECHNOLOGY OF CLEANING OF BOTTOM-HOLE ZONE

oil and gas producing industry. SUBSTANCE: complex technology includes lowering into well of pipes, injection of reagents into interval of treatment and their holding for reaction, cleaning of formation and lifting of pipes. Cleaning of bottom-hole zone is carried out in several stages during one ro...

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Bibliographische Detailangaben
Hauptverfasser:	PAZIN A.N, KARIMOV F.S, TKACHEV A.E
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MINING MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PAINTS POLISHES
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Beschreibung
Zusammenfassung:	oil and gas producing industry. SUBSTANCE: complex technology includes lowering into well of pipes, injection of reagents into interval of treatment and their holding for reaction, cleaning of formation and lifting of pipes. Cleaning of bottom-hole zone is carried out in several stages during one round-trip operation. At the first stage, injected into well is 10% aqueous solution of sodium carbonate with additions of sodium silicate in amount of 2% of sodium carbonate volume in terms of 0.8 cu.m per running meter of formation effective thickness. Then, formation is cleaned. At the second stage, injected into well is 10% aqueous solution of sodium bisulfate in terms of 0.5 cu.m per running meter of formation effective thickness. At the third stage, pipes are lifted after several cleanings of formation, attaining preset inflow and determination of pressure recovery curve. EFFECT: higher efficiency of cleaning of bottom-hole. 2 dwg