Method to modify the water permeability of a Subterranean formation that includes injecting a Composition of the injected microparticles and composition

摘要

We have discovered New Expandable Polymer microparticles comprising a Hydrophobic Polymer Main chain with outstanding labile groups. The particles have an average particle diameter of not Expanded Volume with size ranging from about 0.05 to about 5 microns.The initial formation of the micropartu00edcula and size are not Expanded, initially determined by the outstanding labile groups. Once formed the Hydrophobic Polymer, the microparticles size have not Expanded until a desired Event Activator induces the hydrolysis of labile pendant groups.Then the Polymers are highly Hydrophilic and thus the micropartu00edcula also becomes Hydrophilic, Absorbing Fluid expand its size.The micropartu00edcula Hydrophobic Properties, such as particle size Distribution and average density, enable the effective spread through the Pore structure of the Reservoir Rock of the parent Hydrocarbon, such as Sandstone.The Hydrophobic microparticles when exposed to a triggering Event such as a change in temperature and / or a Predetermined pH sufficient to Hydrolyze the outstanding labile groups, entrecruzantes labile internal reversible, or units of labile Nuclei in Polymers Structured begin to degrade.Allowing the micropartu00edcula expands Absorbing injection Fluid (usually Water).