Iterated foam process and composition for well treatment

Details Iterated foam process and composition for well treatment Iterated foam process and composition for well treatment

1993-01-21

1995-01-31

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166309, 166312, 175 66, 175 69, E21B 2114, E21B 3700, E21B 4340

Patent

active

053852060

ABSTRACT:
In the removal of particulates from a wellbore, such as in air drilling for hydrocarbon recovery, a mixture of an amphoteric foaming agent and, typically, an anionic surfactant is employed. An aqueous solution thereof having a pH of at least 9.5 is used to generate a foam for removing the particulates; then the foam is collapsed by the introduction of acid to reduce the pH below about 4, the particles are removed mechanically, the pH is restored to greater than 9.5, and the foaming solution is returned to the wellbore. The solution may be used several times; partial losses of foaming agent in the process may be easily replenished with each cycle. Cationic surfactants may be used instead of anionic, with foaming and foam collapse being controlled at opposite pH's. Savings are realized in water, drilling chemicals, and settling pits and the like for removing particulates from the foam.

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