Abstract: Compositions and methods for increasing recovery, or flowback, of hydrocarbon compounds from hydrocarbon-containing subterranean oil formations. Concentrates include a sulfonated and/or a sulfated surfactant, an alkoxylated alcohol surfactant, a coupling agent, a hydrotrope, an additional surfactant, and water. Injectate compositions for oil recovery include the concentrate and a water source such as a produced water and/or seawater. Inclusion of particular hydrotropes such as sodium xylene sulfonate and/or potassium toluene phosphate in the compositions provides higher yields of hydrocarbons recovered. Larger amounts of hydrotrope result in an increase in injectate interfacial tension, but also result, as judged by decreased turbidity, in improved compatibility of the surfactant system in injectates made with water sources comprising salts.

Abstract: Disclosed in the present invention are a novel green lithium iron phosphate precursor, a preparation method therefor and an application thereof. The preparation method comprises the following steps: S1, reacting a mixture of an iron source and a phosphoric acid solution, and grinding after the reaction is completed to obtain a product A; reacting a mixture of an organic acid solution, a lithium source, and a carbon source, and obtaining a product B after the reaction is completed, the preparation order of the product A and the product B being not limited; and S2, grinding the mixture of the product A and the product B to obtain a lithium iron phosphate precursor. In the preparation process of the lithium iron phosphate precursor, the solid content can be greatly improved, the energy consumption of the subsequent process is low, the preparation method is simple, and the cost is low.

Abstract: Provided is a composition including fluid carbon dioxide and a polyolefin thickener, wherein the polyolefin thickener includes a polymer of one or more olefin monomers having 8 or more carbon atoms, wherein at least 5 mol percent of the olefin monomers have 12 or more carbon atoms. Associated methods are also provided.

Abstract: The invention relates to a composition for preparing injection fluid in oil and gas recovery comprising an inverse emulsion of an associative water-soluble polymer A comprising at least one hydrophobic monomer or hydrophobic macromonomer, and solid particles of a water-soluble polymer B, said polymer B being preferably associative. The invention also relates to a method of treating a portion of subterranean formation comprising providing the composition, preparing an injection fluid with at least the composition, introducing the injection fluid into portion of the subterranean formation. The composition is particularly useful to prepare fracturing fluid in fracturing operations.

Abstract: A method for isolating a lithium precursor according to an embodiment of the present disclosure includes preparing a preliminary precursor mixture including a preliminary lithium precursor and a preliminary transition metal precursor, mixing the preliminary precursor mixture and a precipitation liquid in a reactor to form a precursor mixture, and injecting a non-reactive gas into the precursor mixture. Accordingly, the lithium precursor can be isolated with high yield and high efficiency.

Abstract: Disclosed is a method for reducing pressure and increasing injection by continuous operation system of biological acid acidification and nano coating, specifically including composition and preparation method of biological acidizing agent and nano coating agent. The method for reducing pressure and increasing injection by continuous operation system of biological acid acidification and nano coating of the present disclosure is able to effectively dredge the stratum water flow channel, reduce the water flow resistance, and achieve the effect of high-efficiency pressure reduction and injection increase of the water injection well.

Abstract: The present disclosure provides a method of biocementation comprising contacting a granular, cohesionless soil with a solution, wherein the solution comprises urea, urease, a source of calcium ions, and a source of non-urease proteins, wherein the urea, urease, source of calcium ions, and source of non-urease proteins are provided in effective amounts suitable to cause crystallization of calcium carbonate.

Abstract: A polymer composition has been developed that comprising an oil-in-water emulsion comprising an aqueous phase comprising water and an emulsifying surfactant having a cloud point of less than 80° C. and a hydrophilic-lipophilic balance (HLB) of greater than or equal to 8, and an oil phase comprising a high molecular weight oil-soluble polymer, wherein the oil-soluble polymer comprises a copolymer derived from reaction of a hydrophobic monomer and an ionizable monomer in a weight ratio from about 999:1 to about 80:20. Methods of using the compositions for drag reduction and corrosion inhibition are also disclosed.

Abstract: A drilling fluid composition includes an aqueous base fluid, 0.01 to 5 wt. % of polyamine-functionalized activated carbon (AC-PAD), 0.1 to 10 wt. % of a shale material, 0.01 to 2 wt. % of a thickener, 0.1 to 10 wt. % of a fluid loss control additive, 0.01 to 5 wt. % of an adsorbent, and 1 to 20 wt. % of a borehole stabilizer. Each wt. % is based on a total weight of the drilling fluid composition. The AC-PAD is uniformly disposed on surfaces of the shale material. The shale material has an average pore size of 5 to 400 nanometers (nm). A method of preparing the AC-PAD and a method of drilling a subterranean geological formation.

Abstract: The present disclosure provides methods and compositions for controlling asphaltenes in a subterranean formation. The compositions may include a halloysite nanotube. The nanotube has a lumen and a polymer, along with a charged surfactant, may be disposed in the lumen. A wax may be disposed on the nanotube. The wax may be disposed at either or both ends of the nanotube, thereby temporarily preventing the polymer and charged surfactant from leaving the lumen.

Abstract: The subject invention provides compositions comprising solvents and surfactants, as well as their use in improving oil and/or gas production. In some embodiments, the compositions comprise chemical or synthetic solvents and/or surfactants. In other embodiments, the compositions comprise biological components, such as microorganisms and/or their growth by-products. The subject invention can be used to dissolve, disperse and/or emulsify paraffin precipitates and/or deposits; prevent and/or inhibit paraffin deposition; remove rust deposits and prevent corrosion associated therewith; inhibit bacterial growth and/or biofilm formation; and to enhance oil recovery.

Abstract: A scale removal agent may effectively be introduced into a well having a formation temperature of 300° F. The scale removal agent is a component of a gelled fluid containing an amine oxide viscoelastic surfactant.

Abstract: According to an embodiment, a process apparatus performs processing on a byproduct generated in a reaction of a raw material including silicon and a halogen element or in a reaction between a raw material including silicon and a raw material including a halogen element. The apparatus includes a process liquid tank, a processing tank, a supplier and an exhauster. A process target member including the byproduct is introduced into the processing tank. The supplier supplies the process liquid from the process liquid tank to the processing tank and performs processing on the byproduct with the supplied process liquid. The exhauster exhausts a gas generated by reaction between the process liquid and the byproduct from the processing tank.

Abstract: Provided in the present invention are a pH-responsive nano-gel plugging material, and a preparation method therefor and the use thereof. The pH-responsive nano-gel plugging material comprises the following raw materials in parts by mass: 50-70 parts of water, 2-3 parts of an emulsifier, 25-35 parts of an acrylic terpolymer, 10-15 parts of a polyalcohol compound, and 10-20 parts of a vinyl pyridine compound. The pH-responsive nano-gel plugging material can be applied to the plugging of Ordovician carbonate rock fractures and micro-karst cave strata, and can automatically identify Ordovician carbonate rock fractures and micro-karst cave leaking layers and realize effective blocking thereof.

Abstract: Disclosed herein is a gas hydrate inhibitor that includes from 1 to 99% by weight of an alcohol, from 1 to 99% by weight of a polyol, from 0.01 to 2.0% by weight of a first organic acid, from 0.01 to 2.0% by weight of a second organic acid and from 1 to 99% by weight of water. The gas hydrate inhibitor is useful in preventing and/or removing hydrates in a fluid to ensure a continuous flow of the fluid.

Abstract: Described herein is a combination of a catalyst and an activator and method of use for causing an exothermic reaction in a low temperature environment. The mixture can include sodium nitrite, an ammonium-based compound, a catalyst that comprises an oxidizer, and an activator and can be injected into a fluid flow path. The fluid flow path can be a pipeline, a flowline, a wellbore, or a subterranean formation. The mixture can cause an exothermic reaction in the fluid flow path and remove, using the exothermic reaction, a damaging material from the fluid flow path.

Abstract: The present invention discloses a CO2 responsive core-shell multi-stage swelling microsphere and a preparation method thereof. The preparation method comprises the following steps: adding a styrene monomer into a sodium dodecyl sulfate solution for emulsion polymerization to obtain a spherical polystyrene solution, taking azobisisobutyronitrile and ethylene glycol for Pinner reaction to obtain an azo compound with hydroxyl functional groups at two ends, taking the azo compound with the hydroxyl functional groups at two ends as a raw material for Schotten-Baumann reaction with methacryloyl chloride to obtain BPAB, adding the BPAB into the spherical polystyrene solution to prepare an active polystyrene core solution, and dissolving the active polystyrene core solution, acrylamide, a CO2 responsive monomer, a CO2 responsive cross-linking agent and a stable cross-linking agent into water to obtain a target product.

Abstract: Provided are an asphalt-like material and a method and use thereof as a plugging agent, and a water-based drilling fluid. The asphalt-like material has a structure shown in formula I, wherein, in the formula I, R1 is selected from the group consisting of —H, —COOH, and —CH2—COOH; R2 is selected from the group consisting of —NH—CH2—CH2—OH, —NH—CH2—CH2—NH2, —N—(CH2—CH2—OH)2, and —NH—CH2—CH2—CH2—OH; R3 is selected from the group consisting of —OH, —NH—CH2—CH2—OH, —NH—CH2—CH2—NH2, —N—(CH2—CH2—OH)2, and —NH—CH2—CH2—CH2—OH; R4 is selected from the group consisting of —NH—CH2—CH2—OH, —NH—CH2—CH2—NH2, —N—(CH2—CH2—OH)2, and —NH—CH2—CH2—CH2—OH; and n is 370 to 400.

Abstract: The disclosure relates to compositions that include a substrate having attached thereto functional molecules capable of interacting with ions, and related methods. Examples of the substrate include graphene, boron nitride and a graphene-boron nitride hybrid. The compositions can reduce (e.g., prevent) scale formation and/or dissolve scale formations in oil and gas production, transportation, storage, and processing systems, such as scales caused by calcium, barium and/or strontium ions.

Abstract: There is provided a fiber-reinforced brittle matrix composite. The fiber-reinforced brittle matrix composite comprises a brittle matrix material (for example, a cementitious or ceramics material) and a coated fiber embedded in the brittle matrix material, wherein the coated fiber comprises a fiber (for example, polyethylene fiber, glass fiber, silicon carbide fiber, alumina fiber, mullite fiber) and a coating material (for example, carbon nanofibers, carbon nanotubes), which is non-covalently disposed on the fiber. A method for producing the fiber-reinforced brittle matrix composite is also provided. The method comprises providing a fiber, disposing a coating material on the fiber to form a coated fiber, wherein the coating material is non-covalently disposed on the fiber, and embedding the coated fiber in a brittle matrix material to obtain the fiber-reinforced brittle matrix composite.