Sand consolidation methods using adsorbable catalysts

Details Sand consolidation methods using adsorbable catalysts Sand consolidation methods using adsorbable catalysts

E - Fixed Constructions

21

B

31/24

E21B 33/138 (2006.01)

Patent

CA 1229478

IMPROVED SAND CONSOLIDATION METHODS USING ADSORBABLE CATALYSTS ABSTRACT Methods are provided for selectively consolidating sand grains within a subterranean formation. First an acidic zirconium salt catalyst, such as ZrOCl2, Zr(S04)2, or ZrCl4, is injected into the subterranean formation, wherein the acidic salt catalyst is adsorbed to the surface of the sand grains. Next a polymerizable resin composition such as furfuryl alcohol oligomer is intro- duced into the well formation. Polymerization of the resin occurs upon exposure to the elevated well tempera- tures and contact with the acid salt catalyst adsorbed to the sand grains. The polymerized resin serves to consoli- date the surfaces of the sand grains while retaining permeability through the pore spaces. An ester of a weak organic acid is included with the resin compositions to control the extent of a polymerization by consuming the water by-product formed during the polymerization reaction.

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