Method for servicing subterranean wells

摘要

Methods for sealing voids and cracks in subterranean-formation rock that contains carbonate minerals, thereby minimizing or stopping fluid flow between the formation rock and the wellbore of a subterranean well, comprise pumping a solution of one or more lattices that contains at least one carboxylated monomer down a well during drilling and allowing it to enter voids (e.g., pores, fractures, vugs and caverns) in the carbonate-containing formation. The solution reacts with divalent cations liberated by the carbonates and forms a plug.

主权项

1. A method of treating a subterranean well, comprising the following steps:
i. pumping a treatment fluid comprising from 5 wt % to 60 wt % of at least one polymer containing at least one carboxylate functional group down the well during drilling; ii. allowing the treatment fluid to enter voids in a subterranean formation containing carbonate minerals; and iii. reacting the treatment fluid with the carbonate minerals and associated divalent cations, thereby forming a plug, characterized in that the reaction to form the plug does not require the presence of a crosslinking agent.