Method for modifying gelation time of organically crosslinked, a

Details Method for modifying gelation time of organically crosslinked, a Method for modifying gelation time of organically crosslinked, a

1994-12-21

1997-04-08

Lovering, Richard D.

Wells

Processes

Cementing, plugging or consolidating

166300, 2523151, 405270, 507222, 507903, 523130, 524916, 588255, F21B 3313, B01J 1300

Patent

active

056179200

ABSTRACT:
Enhanced gel properties (e.g., faster gel time, higher attainable gel strengths) are achieved by reducing the pH and/or increasing the salt of a monovalent and/or divalent cation concentration of an aqueous reaction medium in which a polymer is reacted with an organic crosslinking agent. In addition, the gelation time of an aqueous composition comprising a polymer and an organic crosslinking agent is reduced by heating the composition above about 48.9.degree. C. (120.degree. F.) prior to injecting the composition into a subterranean formation. Alternatively, the gelation time of the aqueous composition is increased by incorporating a pH increasing agent into the composition.

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