摘要:
New compositions of matter are disclosed which are the products resulting from reacting an alkyl substituted aromatic heterocyclic nitrogen-containing compound such as 2,4,6-trimethylpyridine or 2,3,5,6-tetramethylpyrazine with a dicarboxylic acid monoanhydride such as 2-dodecen-1-yl succinic anhydride. These compositions are useful in preventing corrosion of metallic articles in corrosive environments. They are particularly useful in down hole oil and gas well applications.
摘要:
A method of removing SO.sub.2 from a gas stream containing the same by absorbing the SO.sub.2 in an aqueous solution containing a 4-(2-hydroxyalkyl)-2-piperazinone compound or an alkyl or aryl substituted derivative thereof. These compounds provide an absorbent solution which is less subject to loss during the regeneration step and yet effectively remove the SO.sub.2 from the gas stream without interference from other associated gases.
摘要:
The reaction between a hydroxyl-containing material and an isocyanate-containing material is catalyzed by a pyrazino pyrazine compound such as 1,4,5,8-tetramethyldecahydropyrazino(2,3-b)pyrazine.
摘要:
Colloid and/or micelle nano-sizing compositions including a nano-sizing solvent system comprising one or more sesquiterpene solvents, and a nano-sizing activator system comprising one or more dibasic esters, surfactant systems containing colloid and/or micelle nano-sizing compositions, treating/fracturing/completion fluids containing the colloid and/or micelle nano-sizing compositions and methods for making and using same.
摘要:
This invention is a method of preparing a quaternized amidoamine surfactant comprising reacting an amidotertiaryamine of formula with methyl halide and alkylene oxide, an aqueous quaternized amidoamine surfactant composition, a gelled aqueous composition comprising the quaternized amidoamine surfactant composition and one or more salts or alcohols and use of the gelled aqueous composition for fracturing subterranean formations.
摘要:
A method of reducing friction resulting from turbulent flow in an aqueous fracturing fluid in an oil field fracturing process comprising adding to the aqueous fracturing fluid an effective friction-reducing amount of one or more dispersion polymers, wherein the dispersion polymer is composed of from about 5 to about 95 mole percent of one or more nonionic monomers and from about 95 to about 5 mole percent of one or more cationic or anionic monomers and has a molecular weight of at least 100,000.
摘要:
Novel compositions are prepared from (1) amino substituted pyrazine compounds such as pyrazinamine and (2) at least one of (a) a carboxylic acid, (b) carboxylic acid anhydride, (c) carboxylic acid ester or (d) combination thereof, such as tall oil fatty acid, and (3) optionally in the presence of sodium hydride. These novel compositions are useful as oil and gas well corrosion inhibitors.
摘要:
The reaction product of an .alpha.,.beta.-ethylenically unsaturated aldehyde with an organic amine further reacted with a carboxylic acid, organic halide or an epoxide containing compound is employed as corrosion inhibitors in a process for preventing corrosion of ferrous metals in contact with corrosive brine, oil and gas well fluids.
摘要:
The 4-(2-hydroxyalkyl)-2-piperazinones and their substituted derivatives are prepared by reacting a decahydropyrazino[2,3-b]pyrazine or its substituted derivative having at least one active amine hydrogen, with an alkylene oxide having 2 to 4 carbon atoms.
摘要:
Thermosettable prepolymers or polymers are prepared by reacting (A) the reaction product of (1) a heterocyclic material having one or more rings, at least one nitrogen atom and at least two substituent groups which have at least one reactive hydrogen atom attached to a carbon atom which is attached to a heterocyclic ring such as 2,3,5,6-tetramethylpyrazine; (2) a cycloaliphatic or aromatic carboxylic acid mono- or dianhydride such as pyromellitic dianhydride; and (3) a material containing a polymerizable ethylenically unsaturated group and at least one group selected from (a) a heterocyclic material having one or more rings, at least one nitrogen atom and at least one substituent group which has at least one reactive hydrogen atom attached to a carbon atom which is attached to a heterocyclic ring such as 2-methyl-5-vinyl pyridine or (b) a cycloaliphatic or aromatic carboxylic acid mono- or dianhydride group such as cis-5-norbornene-endo-2,3-dicarboxylic anhydride; with (B) an aqueous or alcoholic solution of a hydroxide, carbonate or bicarbonate of a metal of Groups I-A or II-A, such as sodium hydroxide.These polymers or prepolymers when subjected to a thermoset condition by heat and pressure or by homopolymerization in the presence of or copolymerization with an N,N'-bis-imide exhibit good char forming properties when subjected to a temperature of 700.degree. C.