Wintershall Holding Gmbh

Bernd Leonhardt

Stephan Freyer

Tobias Käppler

Rajan Hollmann

Andrea Herold

Thomas Letzelter

Benjamin Wenzke

Julia Kristiane Schmidt

Jörg Therre

Christian Fleck

Florian Lehr

Sascha Rollie

Tillmann Faust

Carsten Schwalb

Foppe Visser

Andrea Hlubek

Hansjörg Rettenmaier

Sebastian Briechle

Tobias Kappler

The presently claimed invention is directed to a method for the preparation of an aqueous solution comprising at least one beta-glucan comprising at least the steps of a) fermentation of at least one fungal strain in an a fermentation broth, b) addition of at least one acid to the fermentation broth to adjust the pH to a value in the range of &#x2265;2.0 to &#x2264;4.0 and c) filtration of the fermentation broth to obtain an aqueous solution comprising the at least one beta-glucan and at least one beta-glucan that is obtained by this method.

Method for preparing an aqueous solution of beta-glucan

A two-stage process for mineral oil production from mineral oil deposits with a deposit temperature of more than 70&#xb0; C. and a salinity of 20 000 ppm to 350 000 ppm, in which an aqueous formulation comprising at least one glucan with a &#x3b2;-1,3-glycosidically linked main chain, and side groups &#x3b2;-1,6-glycosidically bonded thereto and having a weight-average molecular weight Mof 1.5*10to 25*10g/mol, are injected into a mineral oil deposit through at least one injection borehole and crude oil is withdrawn from the deposit through at least one production borehole.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.

Process for mineral oil production from mineral oil deposits with high deposit temperature

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Bobenheim-Roxheim, Germany

Bernd Leonhardt