FIELD: oil and gas production.
SUBSTANCE: object of invention is thawing borehole during operation or repair work in gas and gas-condensate wells associated with presence of hydrate-ice blocks in boreholes, especially under abnormally low formation pressures. Lightened salt solution suitable for these purposes is composed of 8-10% potassium chloride electrolyte, 0.2-0.5% nonionic surfactant, and water (to 100%).
EFFECT: increased reliability of thawing borehole and efficiency of removing destroyed hydrate-ice block.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| LIGHT-WEIGHT ALCOHOL-SALT SOLUTION FOR THAWING OF GAS WELLS IN PERMANENTLY FROZEN HIGH-ICY ROCKS ZONE | 2012 |
|
RU2560739C2 |
| GAS WELL THAWING METHOD | 2004 |
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| METHOD OF WELL ABANDONMENT WITH COLLAPSED PRODUCTION STRING | 2009 |
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| DEPRESERVATION METHOD OF OIL AND GAS WELL WITH NON-TIGHT PRODUCTION CASING WHEN PERMAFROST FORMATIONS ARE AVAILABLE IN SECTION | 2008 |
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| METHOD OF KILLING LOW-TEMPERATURE GAS CONDENSATE WELL | 2006 |
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| METHOD FOR FLUSHING OF PROPPANT PLUG IN GAS OR GAS-CONDENSATE WELL ON COMPLETION OF HYDRAULIC RUPTURE OF BED | 2008 |
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| METHOD OF FILTER CAKE REMOVAL OF BOTTOM HOLE AREA OF LOW-PERMEABLE LOW-TEMPERATURE TERRIGENOUS RESERVOIR | 2014 |
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| METHOD FOR SAND PLUG WASHING OUT FROM WELL | 2006 |
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RU2339789C1 |
