A method of making a proppant-gel matrix comprising: a) hydrating a gelling agent to form a hydrated gelling agent; b) adding a basic compound to the hydrated gelling agent to form a basic hydrated gelling agent having a pH in the range of 11.5 to 14.0; c) mixing the basic hydrated gelling agent and a proppant to form a basic hydrated gelling system; and d) adding a crosslinking agent to the basic hydrated gelling system to form the proppant-gel matrix, is disclosed. The proppant-gel matrix can then be used as a fracturing fluid in a hydraulic fracturing process.

A polymerizable chemical system for consolidating particulates in a subterranean formation including a liquid resin, a curing agent, and a permeability enhancing additive. The chemical system is a homogenous composition that polymerizes to forms a solid upon heating at a temperature greater than 60 C. Consolidating particulates in a subterranean formation includes providing a polymerizable chemical system comprising a liquid resin, a curing agent, and a permeability enhancing additive to a subterranean formation, and polymerizing the polymerizable chemical system to consolidate particulates in the formation to yield a porous consolidated particulates pack.

A polymerizable chemical system for consolidating particulates in a subterranean formation including a liquid resin, a curing agent, and a permeability enhancing additive. The chemical system is a homogenous composition that polymerizes to forms a solid upon heating at a temperature greater than 60 C. Consolidating particulates in a subterranean formation includes providing a polymerizable chemical system comprising a liquid resin, a curing agent, and a permeability enhancing additive to a subterranean formation, and polymerizing the polymerizable chemical system to consolidate particulates in the formation to yield a porous consolidated particulates pack.

A method of controlling sand production in a sandstone reservoir comprising providing (i) an aminosilane and (ii) a polymeric linking agent comprising monomeric units having pendent functional groups selected from the group consisting of carboxylic acids, carboxylic acid esters and amides, wherein a plurality of the pendent functional groups are reacted with the amino group of the aminosilane by a process selected from the group consisting of aminolysis of carboxylic acid ester groups, Mannich reaction between the amino group of the aminosilane and a plurality of at least one of carboxylic acid and amide pendent groups in the presence of an aldehyde activating agent or combination thereof, contacting the aminosilane and polymeric linking agent with the sandstone reservoir to bond the silane group of the aminosilane with particles of sand and provide agglomeration as a result of covalent bonding of the linking agent with a plurality of aminosilanes.

A wellbore fluid comprising an aqueous base fluid and a plurality of particles of a polyhydroxyalkanoate latex polymer having the formula: [OCHR(CH.sub.2).sub.mCO].sub.n, wherein m is a value ranging from 1 to 10 and n is a value equal to or less than 20000.

A method for plugging and sealing subsurface formations using alkaline nanosilica dispersion and a delayed activation chemistry includes introducing a mixture with a first pH into the subsurface formation. The mixture comprises an aqueous solution, an alkaline nanosilica dispersion and a water-insoluble hydrolyzable compound. The method further includes allowing the water-insoluble hydrolyzable compound to hydrolyze in the subsurface formation to form an acid at 70 C. or greater, thereby acidizing the mixture to a reduced second pH and causing the alkaline nanosilica dispersion to gel into a solid and seal the subsurface formation. A composition for sealing a subsurface formation includes an aqueous mixture including water, an alkaline nanosilica dispersion, and a water-insoluble hydrolyzable compound.

Methods and materials for sand control in water injection sites are disclosed. Proppant particles may be coated with some particles coated with a solid epoxy and other proppant particles coated with a solid epoxy curative (such as amine, hydroxyl, carboxyl, anhydride) that would bind the particles through an epoxy reaction. The invention may be advantageous for forming underground structures useful in the extraction of hydrocarbons.

In some examples a method of well treatment may comprise: providing a treatment fluid comprising a microemulsified resin additive, wherein the microemulsified resin additive comprises a continuous phase and a discontinuous phase, wherein the continuous phase comprises an aqueous liquid, wherein the discontinuous phase is in form of micelles of about 200 nm or less in diameter and comprises a resin; introducing the treatment fluid into a subterranean formation penetrated by a wellbore; and allowing the treatment fluid to set in the subterranean formation.

Compositions and a process for consolidating sand, proppant and other suspended particles present in a subterranean reservoir using an aqueous emulsion particle consolidation system. Surfactants with cloud points below the reservoir temperature are used to make a low viscosity aqueous external emulsion system with resin and curing agent as the internal phase. As the surfactant reaches its cloud point, it loses its emulsification ability and release the resin and curing agent to consolidate the sand. The aqueous phase of the system then functions as spacer to maintain the permeability needed for oil and gas production without additional post flush needed.

A method for creating an expandable polymer grout plug within or through a wellbore includes providing an expandable polymer grout system to a target location within or through the wellbore, wherein the expandable polymer grout system comprises: (i) an isocyanate component comprising one or more isocyanate compounds; and (ii) an organic polyol component comprising one or more organic polyol compounds; in the presence of (iii) one or more blowing agents; combining the foregoing components of the expandable polymer grout system to facilitate the polymerization reaction to form the expandable polymer grout plug at the target location; and allowing the expandable polymer grout plug to cure at the target location.