Sand consolidation methods

Details Sand consolidation methods Sand consolidation methods

E - Fixed Constructions

21

B

E21B 33/138 (2006.01)

Patent

CA 2062395

SAND CONSOLIDATION METHODS (D#91,007-F) ABSTRACT OF THE DISCLOSURE Disclosed are methods for consolidating unconsolidated mineral particles such as sand in a subterranean petroleum formation penetrated by a well. A fluid containing a polymerizable resin such as furfuryl alcohol, a polar organic diluent such as butyl aldehyde and an oil soluble acid catalyst such as toluenesulfonic acid capable of causing polymerization of the resin at formation temperatures is prepared. The acid should have a pK in the range of 0.50 to 1.30 and the acid concentration is carefully selected to cause the polymerization reaction to be essentially complete in from 0.75 to 4.0 hours and preferably 1.0 - 2.0 hours at the formation temperature. Usually the selected acid concentration will be in the range of from 0.2 to 5.0 percent. This fluid is injected into the formation to saturate at least a portion of the formation adjacent to the well. An aqueous fluid comprising water which is from 70 to 100 % saturated inorganic salts including sodium chloride is injected into the same portion of the formation contacted by the resin containing fluid. The injected fluids are allowed to remain in the formations for at least four hours to accomplish at least partial polymerization of the resin, forming a permeable consolidated mass around the wellbore.

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