摘要:
Methacrylate derivatives are added to salt-containing media to thicken the media, and are particularly useful in the exploration of mineral oil or natural gas deposits. The salt-containing media have a specific density of 1.2 to 2.5 kg/l. The respective methacrylate derivatives, which may be, e.g., mono- and/or difunctional variants, have been found to be particularly suitable, are used in a volume ratio of 100 to 1:1 and an amount of 0.5 to 15% by volume. The thickening of the salt-containing media is effected primarily as gel formation, which can be carried out with the aid of free radical initiators and at elevated temperatures. In particular, completion brines, drilling and drill-in fluids and fracturing fluids and acids having high salt contents are to be regarded as aqueous media. The methacrylate derivatives have a markedly good solubility in heavy brines, as are used primarily in upstream processes of the oil industry. They can also be polymerized subterraneously, and they simultaneously have a high thermal stability.
摘要:
Subject matter of the present invention is a drilling fluid additive based on sulfonated asphalt, which comprises a water soluble and anionic polymer component in quantities of 0.1 to 20 wt. %, with respect to the total additive in addition to the asphalt component. With this additive the water solubility of sulfonated asphalt can be markedly increased. This additive, whose polymer component is thermally highly stable, is utilized primarily in water- and/or oil-based drilling fluids and in particular in the exploration of subterraneous petroleum and natural gas deposits. Typical polymer components to consider are representatives of polycondensation products, such as phenol resins, ketone resins and sulfonated naphthalene, acetone and amino plasticizer resins (for example urea and melamine resins).
摘要:
A novel method for breaking the viscosity of an aqueous phase thickened with preferably hydrophilic polymers in the exploration and production of mineral oil and/or natural gas is proposed. For this purpose, the breaking is carried out via the formation of a low-viscosity emulsion, with water as the continuous phase, this emulsion being formed by the addition of at least one surface-active component to a system which consists of the thickened drilling fluid and an oil phase which is crude oil present in the reservoir and/or oil introduced into the reservoir. Solubilizers between oil phase and water phase and in particular non-ionic surfactants, cationic surfactants and/or amphoteric surfactants are used as a preferred surface-active component. In addition to the surface-active component, it is possible to use further components, which are demulsifiers, non-emulsifiers, co-surfactants or surface tension modifiers. With the aid of this method, with the simultaneous presence of an oil phase, the aqueous phase can be displaced as a low-viscosity system and finally discharged at the surface, extremely effective cleaning of the well being associated therewith. With regard to the cost-efficiency and from an environmental point of view, the use of chemicals can be completely dispensed with.
摘要:
Rheological control of liquid phases is provided with a composition comprising a high-alumina cement component a) for controlling the rheology of liquid phases based on a clay component b). Component a) is preferably a calcium aluminate cement and component b) is preferably a clay of the smectite variety. The compositions comprise at least 20% by weight representative of the calcium aluminate cement and is preferably used for rheology control of water- or oil-based systems.
摘要:
A copolymer based on olefinic sulphonic acids as monomer component a) and an organosilicone-containing compound as reactive component b) is proposed, for which in particular 2-acrylamido-2-methylpropanesulphonic acid (AMPS®) is suitable as component a) and vinyltrimethoxysilane, vinyltriethoxysilane and trichlorosilane as component b). This copolymer, which may have a molecular weight of from 5,000 to 5,000,000 g/mol, may also comprise further reaction components c) and d) in addition to the two main components for which further reaction components (meth)acrylamides or vinyl ethers are suitable. These copolymers, which are obtainable in particular by precipitation or gel polymerizations, are used in particular in applications in construction chemistry and here especially as water retention agents and fluid loss additives in drilling fluids and for well cementing. The novel copolymers are distinguished by pronounced thermal stability, which is displayed especially under difficult pressure conditions and at high salinities.
摘要:
Disclosed is a process for the fractionation of wool wax acid mixtures by dissolving the starting material in a polar organic solvent (mixture). The dissolved wool wax acid mixture is treated at a temperature between -5 and 30.degree. C. and at a pressure between 10 and 70 bar with gaseous carbon dioxide and the hydroxy-fatty acids that accumulate as a solid are separated from the solution.
摘要:
A process for the extraction of carotenoid dyes from pre-dried natural starting materials is described using compressed gases such as propane and/or butane in which organic entraining agents can be additionally added in order to facilitate and complete the extraction process. With the aid of this process highly concentrated carotenoid dyes are obtained in high yield.
摘要:
The invention relates to a method for impregnating a support matrix with solid and/or liquid compounds using a compressed gas or a compressed mixture of gases at densities ranging from 0.15 to 1.3 kg/l and at least two unsymmetrical pressure changes (pulsations). The method is further characterized in that both a multitude of impregnating substances such as biologically active compounds, technical materials or metal-organic compounds, as well as support matrices of biological origin and organic or inorganic substances can be used that have large inner surfaces and/or inner surfaces that are difficult to access.
摘要:
A process for the extraction of fats and oils from natural substances using liquid propane as the solvent is described in which the extraction is carried out at a pressure of 10 to 30 bar and a temperature of 10.degree. to 55.degree. C. and the separation of the extracted fats and oils from the solvent is carried out by means of pressure reduction or/and temperature increase to .ltoreq.80.degree. C. High quality products are isolated in this way in a good yield and under mild conditions.
摘要:
A process is described for obtaining lipid fractions from egg products in powder form with a content of phospholipids in which the egg product is a) firstly extracted with liquid propane at a pressure of.ltoreq.200 bar and a temperature of.ltoreq.70.degree. C. and b) subsequently with a mixture of liquid propane and an entraining agent composed of an aliphatic alcohol with 1 to 4 C atoms. In this way it is possible to produce lipid fractions with good sensory properties whose content of phospholipids is at least 25% by weight and up to 80% by weight.