Surfactant oil recovery process usable in high temperature, high

Details Surfactant oil recovery process usable in high temperature, high Surfactant oil recovery process usable in high temperature, high

1976-12-01

1978-03-07

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166272, 252855D, E21B 4322, E21B 4324

Patent

active

040774716

ABSTRACT:
Many petroleum formations contain water having high salinity and/or high concentrations of divalent ions such as calcium or magnesium dissolved therein, and are additionally at temperature from about 70.degree. F. to about 300.degree. F. Most surfactants suitable for use in oil recovery operations are either ineffective in high salinity or high hardness waters, or cannot tolerate the higher temperatures encountered in many such formations. An aqueous fluid containing a water soluble alkylpolyalkoxyalkyl sulfonate or alkylarylpolyalkoxyalkyl sulfonate and a water-insoluble polyethoxylated aliphatic alcohol or polyethoxylated alkylphenol nonionic surfactant is effective in formations containing water whose salinity is from 70,000 to 220,000 parts per million total dissolved solids and also having temperatures as high as 300.degree. F. The fluid is phase stable over a wide range of formation temperatures and water salinities and hardness values.

REFERENCES:
patent: 3508612 (1970-04-01), Reisberg et al.
patent: 3739848 (1973-06-01), Lawson et al.
patent: 3799264 (1974-03-01), Cardenas et al.
patent: 3811504 (1974-05-01), Flournoy et al.
patent: 3811505 (1974-05-01), Flournoy et al.
patent: 3811507 (1974-05-01), Fluornoy et al.
patent: 3827497 (1974-08-01), Dycus et al.
patent: 3858656 (1975-01-01), Flournoy et al.
patent: 3890239 (1975-06-01), Dycus et al.
patent: 3977471 (1976-08-01), Gale et al.

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