Polymerizing and anchoring a water-soluble polymer to an in-place mineral surface of a well

摘要

Methods using an anchoring agent for a water-soluble polymer that is in-place polymerized in a subterranean formation. The anchoring agent comprises a hydrolyzable silyl group that reacts with one or more dangling hydroxyl groups of a mineral surface in the subterranean formation to form “hard” bonds, “anchoring” to the mineral surface. The anchoring agent is selected to have another functional group for covalent attachment to the water-soluble polymer. This can help a water-soluble polymer be anchored to a mineral surface in a subterranean formation. Accordingly, it is believed that monomolecular layers of water-soluble polymer will be formed and anchored to the mineral surface, which will provide excellent elastic properties to the matrix. The monomolecular layers are not expected to interfere with the permeability of the matrix.

主权项

1. A method of treating a portion of a well, the method comprising the steps of:
(a) introducing a water-soluble monomer into the portion of the well,
wherein the water-soluble monomer comprises a first polymerizable group, andwherein the water-soluble monomer is polymerizable to form a water-soluble polymer; (b) introducing an anchoring agent into the portion of the well,
wherein the anchoring agent comprises a hydrolyzable silyl group and a second polymerizable group, andwherein the first polymerizable group and the second polymerizable group are the same or different and are copolymerizable; (c) allowing or causing a first condition in the portion of the well that is at least sufficient for the hydrolyzable silyl group to at least partially silylate a surface of a mineral having dangling hydroxyl groups, wherein the mineral is in-place in the portion of the well prior to the step of introducing the anchoring agent; (d) allowing or causing a second condition in the portion of the well that is at least sufficient for the first polymerizable group and the second polymerizable group to copolymerize; and (e) allowing or causing a third condition in the portion of the well that is at least sufficient for the first polymerizable group to polymerize; wherein any two of the first condition, the second condition, and the third condition can be the same or different;
wherein the step of introducing the water-soluble monomer comprises introducing the water-soluble monomer in a non-aqueous fluid in which the water-soluble monomer is soluble.