Wells – Processes – Cementing – plugging or consolidating
Patent
1983-12-15
1985-04-23
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
166300, E21B 33138
Patent
active
045124078
ABSTRACT:
Methods are provided for selectively consolidating sand grains within a subterranean formation. First an acidic zirconium salt catalyst, such as ZrOCl.sub.2, Zr(SO.sub.4).sub.2, or ZrCl.sub.4, 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 introduced into the well formation. Polymerization of the resin occurs upon exposure to the elevated well temperatures and contact with the acid salt catalyst adsorbed to the sand grains. The polymerized resin serves to consolidate 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.
REFERENCES:
patent: 2604172 (1952-07-01), Wrightsman
patent: 3373813 (1968-03-01), Jennings et al.
patent: 3544530 (1970-12-01), Shaffer
patent: 3548944 (1970-12-01), Hess
patent: 3612181 (1971-10-01), Brooks, Jr.
patent: 3630285 (1971-12-01), Claytor, Jr. et al.
Modern Plastics Encyclopedia, p. 124, (1970-1971).
Getty Oil Company
Suchfield George A.
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