1394results about "Dewatering/demulsification with chemical means" patented technology

This invention relates to a novel process for treating and removing undesirable impurities from oil and gas well fracturing fluid. A method for treating fracturing water comprising: (a) passing contaminated fracturing water containing solids and liquid through a mechanical separator to remove solids from the liquid; (b) treating the fracturing water liquid with an alkaline agent to increase the pH of the liquid to a level of above 9; (c)) adding a coagulant to the fracturing water to form an agglomerate and separating the agglomerate from the fracturing water; (d) reducing the pH of the fracturing water of step (c)) to a level of less than about 5.5; and (e) adding an oxidizing agent to the fracturing water of step (d) to oxidize oxidizable impurities in the fracturing water.

A mobile apparatus and method for recycling an invert emulsion based drilling fluid, in which the invert emulsion based drilling fluid includes an oleaginous component and an aqueous component. The apparatus includes an emulsion breaking tank, a water treatment tank, a filter press, and hydrocarbon filters. The method includes: mixing said invert emulsion drilling fluid with a emulsion breaker, wherein the emulsion breaker is a mixture of an alkyl glucoside and an alkane sulfonate; and separating the oleaginous component of the invert emulsion drilling fluid from the aqueous component of the invert emulsion drilling fluid. The method preferably utilizes an emulsion breaker that is a combination of an anionic surfactant, a nonionic surfactant and an alkyl polyglycoside surfactant.

Improved performance in the phase separation of aqueous brines from hydrocarbons within an electrostatic desalter operation is obtained by the addition to the crude oil emulsions entering the desalter of an effective asphaltene dispersing amount of an alkyl phenol-formaldehyde liquid resin polymer, optionally in the presence of a lipophilic/hydrophilic vinylic polymer. The preferred resin is a nonyl phenol-formaldehyde resin having a molecular weight of from 1,000-20,000, and the preferred vinylic polymer is a copolymer of lauryl (meth)acrylate and hydroxyethyl (meth)acrylate. Best results from the electrostatic desalter are obtained when also using a demulsifier chemical treatment along with the asphaltene dispersing treatments. Desalter efficiency is increased and desalter brine effluent quality is greatly increased.

The invention relates to a preparation method of an efficient deemulsifier for naphthenic extra heavy oil and a product thereof, belonging to the technical field of petroleum processing. The efficient deemulsifier is prepared by polymerizing alkylphenol, polyethylene polyamine and formaldehyde to obtain thermoplastic phenol-amine resin as an initiator, polymerizing the initiator with oxirane and epoxypropane to generate polyether blocked copolymer, and then esterifying the polyether blocked copolymer with acrylic acid and other unsaturated acids to generate a modified polyether product by grafting olefine acid. The product prepared by the method has the characteristics of quick dehydration and low dosage. The efficient deemulsifier of the invention is suitable for dehydrating the naphthenic extra heavy oil of Karamay oil fields, meeting the requirements of proper temperature, quick dehydration, high dehydration rate, clear water color, and tidy oil-water interface, and has high efficiency demulsification and dehydration performance.

The invention relates to a preparation method for a chitosan natural polymer modified crude oil desalting demulsifier. The method comprises the following steps: 1) modifying polyethylene glycol monomethyl ether by halogenating; 2) preparing glycidyl dimethyl alkyl ammonium chloride; 3) preparing quaternized carboxy alkyl chitosan; 4) causing the modified polyethylene glycol monomethyl ether to react with the quaternized carboxy alkyl chitosan, thereby obtaining a target product, polyethylene glycol monomethyl ether grafted quaternized carboxy alkyl chitosan. According to the invention, the chitosan natural high-molecular compound is taken as the raw material and has the advantages of wide resource, naturality, non-toxicity, sustainability, excellent biological compatibility of products, degradability, and the like. The demulsifier prepared according to the invention has excellent demulsification dewatering effect; the molecule of the demulsifier contains a large amount of carboxy alkyl groups and quaternary ammonium salt groups and the electronegative ions, including metal cation, naphthene acid radicals, and surfaces are electronegative grains and have strong combining capacity, so that the demulsifier has the capacities of demulsifying while removing oil-soluble salt.

The invention provides a foam control formulation in the form of a microemulsion, the formulation comprising: (a) from S to 70% w/w of primary surfactant, this surfactant having an HLB of from 1 to 12 and/or a cloud point of from 20 to 70° C.; (b) from 2 to 40% w/w of water-insoluble organic carrier liquid; and (c) water. Also provided is the use of this formulation to prevent and/or reduce foam in a fluid system, or as a processing aid to control foam production in a fluid system. The formulation may be used in an aqueous fluid system, such as an oilfield.

The invention relates to a preparation method of a polyether-grafted chitosan derivative crude oil desalting demulsifier. The preparation method comprises the following specific steps: firstly, performing formylation modification on polyethylene glycol monoethylether; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternarization carboxyalkyl chitosan; fourthly, enabling formylation modified polyethylene glycol monoethylether to react with carboxy alkyl chitosan to obtain the polyether-grafted chitosan derivative crude oil desalting demulsifier. The polyether-grafted chitosan derivative crude oil desalting demulsifier disclosed by the invention is prepared by taking chitosannatural polymeric compounds as raw materials, and has the advantages of wide sources, naturalness, no toxicity, sustainability, good biocompatibility of a product, degradability and the like. The prepared demulsifier is good in demulsifying and dehydrating effect; meanwhile, a demulsifying molecule contains a large amount of carboxyalkyl groups and quaternary ammonium salt groups which have strong combining capacity to metal cation, ions with negative electricity such as naphthenic acid radicals as well as particles of which the surfaces are electronegative, so the polyether-grafted chitosan derivative crude oil desalting demulsifier has capacity of removing oil-soluble salts while demulsifying.

A process for dewatering oil sand fine tailings is provided and comprises a dispersion and floc build-up stage comprising in-line addition of a flocculent solution comprising an effective amount of flocculation reagent into a flow of the oil sand fine tailings; a gel stage wherein flocculated oil sand fine tailings is transported in-line and subjected to shear conditioning; a floc breakdown and water release stage wherein the flocculated oil sand fine tailings releases water and decreases in yield shear stress, while avoiding an oversheared zone; depositing the flocculated oil sand fine tailings onto a deposition area to form a deposit and to enable the release water to flow away from the deposit, preferably done in a pipeline reactor and managing shear according to yield stress and CST information and achieves enhanced dewatering.

The invention relates to a synthesis method of a crude oil desalting demulsifying agent. The method specifically includes the steps of firstly, conducting p-nitrophenyl ester modification on methoxypolyethylene glycol; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternized carboxy alkyl chitosan; fourthly, making the modified methoxypolyethylene glycol react with quaternized carboxy alkyl chitosan to obtain a product, namely polyethylene glycol questin grafted quaternized carboxy alkyl chitosan. A chitosan type natural high-molecular compound serves as the raw material and has the advantages of being wide in resource, natural, free of toxin, sustainable, good in product biocompatibility, degradable and the like; The prepared demulsifying agent is good in demulsifying dewatering effect; meanwhile, due to the fact that lots of carboxy alkyl groups and quaternary ammonium salt groups are contained in demulsifying agent molecules and have strong binding capacity with metal cations, naphthenic acid radicals and other ions with negative charges and particles with surface electronegativity, the oil-soluble salt removing capacity is achieved during demulsifying.

The invention relates to a method for preparing comb-shaped polymer crude oil desalting demulsifier. The method comprises the following steps: (1) performing acrylatioed modification on methoxy polyethylene glycol; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) reacting modified methoxy polyethylene glycol with quaternized carboxyalkyl chitosan to obtain the target product demulsifier. The demulsifier is prepared by using chitosan naturalpolymer compounds as raw materials, and has the advantages of wide source, nature, no toxicity, sustainability, good product biocompatibility, degradability and the like. The prepared demulsifier has good demulsification and dehydration effect since the molecular structure is a comb-shaped polymer formed by simultaneously grafting a plurality of linear branched chains on a main chain, and has a strong binding capability on metal cations, naphthenate radicals and other negatively charged ions and particles which are electronegative on surfaces since a great amount of carboxyalkyl groups and quaternary ammonium salt groups on the molecules. Therefore, the demulsifier has capabilities of demulsifying and removing oil-soluble salt.

There is provided herein in one specific embodiment a process for separating a mixture comprising: combining at least one silicone surfactant (a), where silicone of silicone surfactant (a) has the general structure of:

M¹_aM²_bD¹_cD²_dT¹_eT²_fQ_g and

a mixture (b) comprising an aqueous phase, a solid filler phase and optionally an oil phase that is substantially insoluble in said aqueous phase; and providing for separation of any one or more of said aqueous phase, said solid filler phase, and if present, said oil phase from mixture (b) to provide a separated mixture (b).

Disclosed and claimed is a microemulsion-based demulsifier composition and a method of demulsifying an emulsion comprising hydrocarbon and water. The demulsifier composition includes (i) an oil-like phase comprising at least one nonionic surfactant having a hydrophilic-lipophilic balance (HLB) of less than about 9; (ii) a coupling agent capable of stabilizing the demulsifier composition; (iii) at least one water-soluble or dispersible nonionic surfactant that is different from the at least one nonionic surfactant in the oil-like phase; (iv) at least one additional surfactant selected from anionic, cationic, amphoteric, and combinations thereof; (v) at least one nonionic demulsifier; and (vi) water.

The invention discloses an acid-containing crude oil demulsifying agent and a preparation method thereof. The effects of eliminating oil water emulsification, reaching deep desalination and dehydration and reducing oil in drained water are achieved. The demulsifying agent consists of 30 to 60 weight percent of polyvinyl polyamine polyoxyethylene polyoxypropylene ether, 1 to 10 weight percent of emulsifying inhibitor, 1 to 10 weight percent of flocculating agent, 1 to 15 weight percent of dispersion cosolvent and 20 to 50 weight percent of solvent. The demulsifying agent can be used for electric desalination and dehydration processes of acid-containing crude oil and acidified crude oil, the adding amount is 10 to 100mug/g, the salt content of the acid-containing crude oil after electric desalination can be reduced to be less than 3mgNaCl/L, and the water content can be reduced to be less than 0.3 weight percent.

The invention discloses a preparing method of an oil field demulsifier. The preparing method adopts ethyleneamine as a raw material, and the oil field demulsifier is prepared by crosslinking modification of the ethyleneamine, ethylene oxide, and propylene epoxide. The method comprises the following steps of: with the ethyleneamine as an initiator, enabling the ethyleneamine to react with propylene oxide and ethylene oxide to prepare an ethyleneamine type polyether demulsifier under the existence of a basic catalyst; carrying out self-crosslinking reaction on the polyether demulsifier A by adopting polycarboxylic acid under the action of a catalyst to prepare a product B; and finally carrying out self-crosslinking reaction on the polyether demulsifier A and the product B in a solvent by adopting toluene diisocynate to prepare a high performance demulsifier as a final product. The demulsifier prepared by the preparing method has the advantages of higher relative molecular weight, favorable dehydration effect and favorable broad spectrum, and can be used for demulsification and dehydration of the crude oil in the oil field. The dehydrated water is clear, and the dosage of the demulsifier is less.

The invention relates to a demulsifying dehydration method of an oilfield produced liquid. The method comprises a step that emulsifying dehydration is carried out by mixing the oilfield produced liquid with a demulsifying assistant and a demulsifying agent, wherein the oilfield produced liquid contains an emulsified viscosity reducer, the demulsifying assistant comprises one or more of a polymeric aluminum flocculant, a polymeric iron flocculant and a metal-polysilicate flocculant, and the application amount of the demulsifying assistant is 50-10000pm on the basis of the quality of the oilfield produced liquid.