Abstract: The presently claimed invention is directed a solid particles-stabilized emulsion containing a continuous phase and a dispersed phase comprising a) water, b) crude oil having a viscosity in the range of 1 to 10000 mPa·s at a temperature of 20° C. according to DIN 53019 and c) at least one layered double hydroxide of general formula (I), wherein water is the continuous phase and crude oil is the dispersed phase, and a process for preparing the same.

Abstract: A two-stage process for mineral oil production from mineral oil deposits with a deposit temperature of more than 70° C. and a salinity of 20 000 ppm to 350 000 ppm, in which an aqueous formulation comprising at least one glucan with a ?-1,3-glycosidically linked main chain, and side groups ?-1,6-glycosidically bonded thereto and having a weight-average molecular weight Mw of 1.5*106 to 25*106 g/mol, are injected into a mineral oil deposit through at least one injection borehole and crude oil is withdrawn from the deposit through at least one production borehole. The aqueous formulation is prepared in two stages, by first preparing an aqueous concentrate of the glucan, and diluting the concentrate on site with water to the use concentration.

Abstract: The invention relates to a heat generator for well stimulation, comprising a tubular fuel vessel (22) with two or more mutually separated, closed segments (23) arranged in longitudinal succession and each at least partly filled with fuel (30), and at least one igniter (40) for ignition of the fuel in at least one of the segments (23), wherein the ends of the segments are connected such that the fuel in a subsequent segment is ignitable owing to the evolution of heat in the course of burnoff of the fuel in a preceding segment. The invention further relates to a process for well stimulation using an inventive heat generator.

Abstract: The invention relates to a device for cleaning a liquid-filled well (10) comprising a tubular vessel (21), the interior of which contains at least one combustion chamber (30) and at least one hollow chamber (25) arranged in longitudinal succession, the combustion chamber (30) being at least partly filled with a fuel (31) and having an igniter (32), and the vessel (21) having at least one inflow orifice through which well fluid can flow from the outside into the vessel (21), wherein the at least one inflow orifice is provided with a closure device (42) comprising at least one closure element which loses its integrity on exceedance of a given temperature, such that the closure device (42) opens. The invention further relates to a process for stimulating and cleaning a liquid-filled well using an inventive device.

Abstract: The present invention relates to free-flowing aqueous compositions and to a process for enhancing the production rate of mineral oil and/or natural gas from an underground deposit which comprises mineral oil and/or natural gas, and into which at least one well has been sunk, the latter being in contact with the underground deposit through at least one perforation region.

Abstract: A process for producing natural gas and/or natural gas condensate from an underground gas condensate deposit comprising a gas mixture having retrograde condensation characteristics, comprising at least the process steps of: a) sinking at least one production well into the underground gas condensate deposit and producing natural gas and/or natural gas condensate from the underground production well through the at least one production well, b) injecting a solution (S) comprising a solvent and urea through the at least one production well into the underground gas condensate deposit, c) waiting for a rest phase in which the urea present in the solution (S) is hydrolyzed, d) producing natural gas and/or natural gas condensate from the underground gas condensate deposit through the at least one production well.

Abstract: A device for well stimulation comprising a carrying element (22) with a first delimiting element (23) and a second delimiting element (25), also at least one charge pack (30), which comprises one or more charge units (31) of a solid fuel, and also at least one detonator (40) for detonating the at least one charge pack (31), the charge pack or the charge packs being arranged on the carrying element (22) between the delimiting elements (23, 25), wherein the charge units (31) are configured as cylinders with a continuous axial clearance, and the carrying element (22) is formed as a rod or cable and is led through the axial clearances.

Abstract: A process for dissolving deposits comprising alkaline earth metal sulfates in underground installations or installation parts for production of mineral oil, natural gas and/or water, by treating the deposits with an aqueous formulation comprising methanesulfonic acid.

Abstract: A multistage process for producing mineral oil from mineral oil deposits by injecting aqueous flooding media into a mineral oil formation through injection boreholes and withdrawing the mineral oil through production boreholes, in which the mineral oil yield is increased by the use of microorganisms in combination with measures for blocking highly permeable zones of the mineral oil formation.

Abstract: The present invention is directed to a method for coating a sheet-like cellulose containing material by applying a composition comprising at least one glucan (G), which has a ?(beta)-1,3-glycosidically linked main chain and at least one side group having a ?(beta)-1,6-glycosidic bond to the main chain, particularly Schizophyllan, and at least one solvent (S), particularly a ionic liquid, on the surface of the sheet-like material.

Abstract: A process for producing mineral oil from mineral oil deposits by injecting aqueous flooding media into a mineral oil formation through injection boreholes and withdrawing the mineral oil through production boreholes, wherein the process comprises several cycles of process steps in which oil-mobilizing microorganisms and flooding water are injected alternately into the deposit. Processes in which highly permeable regions of the mineral oil formation are additionally blocked.

Abstract: The present invention relates to formulations (F) based on crude glycerol (CG), cellulose ether and urea, to a process for producing mineral oil from mineral oil deposits having inhomogeneous permeability and to a process for producing formulations (F) comprising crude glycerol (CG). The rheological properties of the inventive formulations (F) are modifiable within wide ranges, and can be adjusted to the geotechnical parameters, the environmental conditions and the nature of the mineral oil in different mineral oil deposits.

Abstract: The present invention relates to genetically modified microorganisms capable of producing beta-glucans, characterized in that said genetically modified microorganism overexpresses (i) a polynucleotide encoding a polypeptide having 1,3-?-D-glucan synthase-activity, and/or (ii) a polypeptide having 1,3-?-D-glucan synthase-activity, compared to a corresponding non-modified control microorganism of the same strain. The present invention also relates to the use of a polynucleotide encoding a polypeptide having 1,3-?-D-glucan synthase-activity or the use of such a polypeptide for producing ?-glucans. Furthermore, the present invention relates to methods for producing ?-glucans comprising the introduction of a promoter upstream of a polynucleotide encoding a polypeptide having 1,3-?-D-glucan synthase-activity thereby increasing the expression of said polynucleotide, or a polynucleotide encoding a polypeptide having 1,3-?-D-glucan synthase-activity into a microorganism being able to synthesize ?-glucans.

Abstract: The present invention relates to a process for the production of mineral oil from mineral oil deposits with large temperature gradients, in which, for increasing the mineral oil yield, highly permeable regions of the mineral oil formation are blocked by injecting formulations which, after being forced into the deposit, form highly viscous gels under the influence of the deposit temperature. A plurality of portions of the formulation which in each case can form gels at different temperatures and therefore result in very complete blocking of highly permeable regions of the formation are used.

Abstract: The present invention relates to novel methods for precipitating beta-glucan (?-glucan) by using high-molecular polyethylene glycol (PEG) and re-dissolving the precipitated ?-glucan in a suitable medium. The novel method of the present invention may also include drying the precipitated ?-glucan and/or swelling the precipitated b-glucan in a suitable solution before re-dissolving the ?-glucan.

Abstract: A process for the preparation of aqueous solutions of glucans having a ?-1,3-glycosidically-linked main chain and side groups having a ?-1,6-glycosidic bond by fermentation of fungal strains. The fungal strains secrete the glucans into the fermentation broth, in an aqueous culture medium, and the separation of the glucans from the fermentation broth is effected using asymmetrical filter membranes.

Abstract: A process for mineral oil production, in which an aqueous formulation comprising tris(2-hydroxyphenyl)methane of the general formula (I) is injected into a mineral oil deposit through an injection well and the crude oil is withdrawn from the deposit through a production well, where the R1, R2 and R radicals in the formula (I) are each defined as follows: R is independently 1 to 2 hydrocarbyl radicals per phenyl ring, R1 is preferably H or OH, R2 are independently radicals of the general formula (III), —(R5—O—)n—R6—X??(III) where n is a number from 1-50, and where the R5 radicals are R7 groups R6 is a single bond or an alkylene group having 1 to 10 carbon atoms, X is H or an acidic end group, R10 is, for example, C1-C6-hydrocarbyl radical, enables improved mineral oil production.

Abstract: A process for producing mineral oil, in which an aqueous flooding medium comprising water, a glucan, urea and optionally surfactants is injected into the mineral oil formation and mineral oil is withdrawn from the formation through at least one production well, wherein the formation has a temperature of at least 60° C. The formulation forms in situ foams in the formation under the influence of the formation temperature.

Abstract: A process for producing mineral oil from underground mineral oil deposits. One or more flooding media is injected into an injection well and mineral oil is withdrawn from a production well. Highly permeable zones are blocked in the region between the injection well and the production well by injecting aqueous formulation F1 and aqueous formulation F2 each separately in succession through the injection well into the deposit. F1 and F2 mix with one another in the formation after injection to form viscous gels. F1 comprises water and urotropin and F2 comprises water and urea. F1 and/or F2 comprise(s) at least one further compound M selected from metal compounds and semimetal compounds, which further compound can form gels when admixed with bases, the injection well temperature before process step (2) being not more than 60° C.

Abstract: The present invention relates to a process for producing mineral oil from mineral oil deposits, in which the mineral oil yield is increased by blocking high-permeability regions of the mineral oil formation by injecting at least one formulation into the deposit, the formulation not being brought to a temperature at which the viscosity increases significantly until within the deposit, by injection of steam. The process can be used especially in the final stage of deposit development between water flooding and steam flooding of the deposits.