The present invention provides a surface-active two-tailed hydrophobic associated polymer and a preparation method thereof. The surface-active two-tailed hydrophobic associated polymer is prepared using a micellar free radical copolymerization method including: adding a surfactant sodium lauryl sulfate and a hydrophobic monomer N-phenethyl-N-alkyl (methyl) acrylamide or N-benzyl-N-alkyl (methyl) acrylamide into an aqueous solution containing acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and surface-active macromonomer polyoxyethylene lauryl ether (methyl) acrylate, wherein the surfactant is used to solubilize the hydrophobic monomer in the formed micelle; adjusting pH to 6-8 with sodium hydroxide, and copolymerizing the hydrophobic monomer and a water-soluble monomer by means of photoinitiation. The properties, such as viscosifying property, temperature resistance, salt resistance and hydrolysis resistance, of the hydrophobic associated polymer can be effectively improved. The preparation method is reliable in principle and simple in operation and has a wide market prospect.

An ultra-high temperature fracturing fluid, including the following components in mass percentages: 0.4 wt %-0.8 wt % of a polymer thickener, 0.015 wt %-0.02 wt % of a non-metallic crosslinking agent, 0.04 wt %-0.06 wt % of a gel breaker and the rest is water. The polymer thickener is obtained by a polymerization of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, rigid monomer and cationic hydrophobic monomer in a weight ratio of 55-70:15-20:15-20:0.5-3:0.1-1.0, the polymerization temperature is 30-40 C. and the polymerization time is 8-10 hours. The fracturing fluid of the present invention can effectively solve the technical problems that traditional fracturing fluids are easily decomposed at high temperatures and affect performance.

The present disclosure relates to material for use in oil and gas well completion activities. More particularly, the present disclosure relates to diversion particles, along with methods for making and using the diversion particles. In an embodiment, a composite diversion material includes a non-degradable component comprising two or more non-degradable particulates, wherein the non-degradable particulates have a long term permeability at 7,500 psi of at least about 20 D. The composite diversion material includes a degradable component surrounding at least a portion of the non-degradable component. In another embodiment, a method of making a composite diversion material includes mixing non-degradable proppant particles with an aqueous solution containing a first degradable material to provide a mixture having a proppant concentration of at least about 20 volume percent. The method includes drying the mixture at a temperature of from about 25 C. to about 200 C. to provide the composite diversion material.

The present invention provides a surface-active two-tailed hydrophobic associated polymer and a preparation method thereof. The surface-active two-tailed hydrophobic associated polymer is prepared using a micellar free radical copolymerization method including: adding a surfactant sodium lauryl sulfate and a hydrophobic monomer N-phenethyl-N-alkyl (methyl) acrylamide or N-benzyl-N-alkyl (methyl) acrylamide into an aqueous solution containing acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and surface-active macromonomer polyoxyethylene lauryl ether (methyl) acrylate, wherein the surfactant is used to solubilize the hydrophobic monomer in the formed micelle; adjusting pH to 6-8 with sodium hydroxide, and copolymerizing the hydrophobic monomer and a water-soluble monomer by means of photoinitiation. The properties, such as viscosifying property, temperature resistance, salt resistance and hydrolysis resistance, of the hydrophobic associated polymer can be effectively improved. The preparation method is reliable in principle and simple in operation and has a wide market prospect.

Systems and methods having friction reducer compositions for use in subterranean treatment fluids are provided. An embodiment of the present disclosure is a method comprising: (A) forming a treatment fluid comprising: an aqueous base fluid, a friction reducer, and an alkaline buffering agent, wherein the treatment fluid has a pH in the range of about 7 to about 10; and (B) injecting the treatment fluid into a wellbore penetrating at least a portion of a subterranean formation at a pressure sufficient to create or enhance one or more fractures within the subterranean formation.

Provided are methods and systems for treating a subterranean formation. An example method comprises adding proppant particulates to a fluidized bed granulator; spraying a binding agent on the proppant particulates to at least partially coat the proppant particulates with the binding agent, wherein the coated proppant particulates form proto-aggregates; adding the proto-aggregates to a treatment fluid; and introducing the treatment fluid into a fracture within the subterranean formation.

The invention relates to aviscosifier useful for oilfield fluids, especially high TDS fluids and heavy brines, comprising: at least a zwitterionic polymer, prepared by inverse emulsion polymerization of: monomers A comprising a betaine group; nonionic monomers B monomers C including a metal ion crosslinkable group with a molar ratio of the monomers A to the monomers B between 4/96 and 40/60; and at least a metal ion compound leading to the crosslinking of the groups carried by monomers C.

Embodiments for a high temperature fracturing fluid comprise an aqueous fluid, carboxyl-containing synthetic polymer, metal oxide nanoparticles having a particle size of 0.1 to 500 nanometers, and a metal crosslinker which crosslinks the carboxyl-containing synthetic polymers to form a crosslinked gel, wherein the metal oxide nanoparticles are dispersed within the crosslinked gel.

Copolymers and compositions containing copolymers having advantageous viscosity, friction reduction, dissolution, pH-stability, and temperature-stability are provided. These copolymers can be used as rheology modifiers for oil field applications.

Compounds, compositions and methods of use thereof are provided, the compounds comprising a hydrophobically modified polyelectrolyte comprising a nonionic monomer, an ionic monomer, a monomer having the structure of Formula 1, and a monomer having the structure of Formula 2,

##STR00001##

wherein R.sub.1, R.sub.2, R.sub.3, R.sub.5, R.sub.6, and R.sub.7 are independently hydrogen, unsubstituted alkyl, substituted alkyl, carbonyl, carboxyl, aryl, or alkaryl; R.sub.4 is linear C.sub.3 to C.sub.30 alkyl; R.sub.8 is branched C.sub.3 to C.sub.30 alkyl; X.sub.1 and X.sub.2 are
independently C(O)O, C(O)NR.sub.9, O, C(R.sub.9).sub.2O, -arylene-, -arylene-C(R.sub.9).sub.2O, -arylene-C(R.sub.9).sub.2N(R.sub.10) or -arylene-C(R.sub.9).sub.2N.sup.+(R.sub.10).sub.2; R.sub.9 and R.sub.10 is independently hydrogen or a C.sub.1 to C.sub.4 alkyl; and wherein a molar ratio of the monomer of Formula 1 to the monomer of Formula 2 is from about 1.5:1 to about 15:1. The compounds are useful as viscosifying agents in oil and gas applications.