Emulsfiying agent, reverse emulsions produced using this emulsifying agent and use of these emulsions in drilling wells
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United States of America Patent
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Sep 7, 1993
Issued Date -
N/A
app pub date -
Jan 27, 1992
filing date -
Sep 5, 1989
priority date (Note) -
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Abstract
An emulsifying agent according to formula (I) having a molecular weight of between 3000 and 10000: ##STR1## where A represents a terminal group for polyacrylates R.sub.1 represents an oleyl group containing up to 20 mol % stearyl groups: R.sub.2 is a residue with the formula --(CH.sub.2 H.sub.4 O).sub.x (C.sub.3 H.sub.16 0).sub.y --CH.sub.3, where x is between 8 and 24 and y is between 0.75 and 2.25; l is between 1 and 3 is between 0.85 and 3.5; and n is between 0.12 and 0.5. A method of forming a reverse emulsion using this emulsifying agent. A heavy reverse emulsion, without solids comprising: 10 to 70% by volume of a dispersed brine phase having a density of between 1.20 and 2.77; 90 to 30% by volume of a continuous oil phase, and 15 to 60 g/liter of this emulsifying agent.
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