Sand consolidation method

Details Sand consolidation method Sand consolidation method

E - Fixed Constructions

21

B

31/32

E21B 43/22 (2006.01) C07D 307/44 (2006.01) C09K 8/575 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2028168

SAND CONSOLIDATION METHOD (D#79,192-F) ABSTRACT This invention relates to a method of treating wells completed in subterranean formations containing unconsolidated sand particles, so as to form a permeable barrier which permits relatively free flow of liquids including petroleum therethrough while restraining the flow of sand particles into the wellbore. The method comprises formulating a treating fluid containing a compound which undergoes acid catalyzed polymerization, preferably an oligomer of furfuryl alcohol, and an anhydride of a strong acid such as phosphorous tribromide mixed in a suitable diluent such as methyl isobutyl ketone. The composition is injected into the formation. The anhydride reacts with trace amounts of water forming an acid which catalyzes the polymer. Polymerization produces more water to react with additional anhydride. The water content of the treating zone must be less than five percent by volume based on the volume of the pore volume of the treating zone, which usually requires a pre-treatment to remove water from the treatment zone, such as a preflush with a non aqueous fluid. AP21:1

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