Use of dicarbonyl compounds for increasing the thermal...

Details Use of dicarbonyl compounds for increasing the thermal... Use of dicarbonyl compounds for increasing the thermal...

C - Chemistry, Metallurgy

09

K

C09K 8/08 (2006.01) C09K 8/40 (2006.01) C09K 8/60 (2006.01)

Patent

CA 2655837

The invention relates to the use of dicarbonyl compounds to increase the temperature stability of biopolymers in watery, liquid phases during crude oil and natural gas exploration. The biopolymer component should preferably consist of polysaccharides produced by fermentation, such as, e.g., scleroglucane or welan gum. The watery, liquid phase typically constitutes a drilling rinse, which can also contain high salt concentrations ("brines"). Glyoxal is a particularly suitable form of dicarbonyl. Glyoxal can either be added to the liquid phase or, preferably, has already been integrated during the production phase of the biopolymer. The invention is particularly advantageous when used at rock formation temperatures of more than 250° Fahrenheit.

L'invention concerne l'utilisation de composés dicarbonyle pour augmenter la stabilité à la température de biopolymères dans des phases liquides aqueuses dans l'exploration de pétrole brut et de gaz naturel. Les composants biopolymères sont de préférence des polysaccharides produits par fermentation comme par exemple le scléroglucane ou la gomme welan. La phase liquide aqueuse constitue habituellement une boue de forage qui peut contenir également des concentrations élevées de sels (= solutions salines =). Comme représentant particulièrement approprié des dicarbonyles, on peut citer le glyoxal. Celui-ci peut être mélangé à la phase liquide ou de préférence être intégré également en cours de production du biopolymère. L'utilisation selon l'invention présente ses avantages en particulier à des températures dans la formation de roche qui sont supérieures à 250° Fahrenheit.

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