Generating acid downhole in acid fracturing

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 8/74 (2006.01) C09K 8/80 (2006.01)

Patent

CA 2502159

An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid- containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid- precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.

L'invention concerne un procédé de fracturation à l'acide dans lequel l'acide est produit dans la fracture par hydrolyse d'un précurseur solide d'acide choisi parmi un groupe de précurseurs comprenant un ou plusieurs lactide, glycolide, acide polylactique, acide polyglycolique, un copolymère d'acide polylactique et d'acide polyglycolique, un copolymère d'acide glycolique avec d'autres hydroxyacides, acides hydroxycarboxyliques, ou des entités contenant des acides hydroxycarboxyliques, et un copolymère d'acide lactique avec d'autres hydroxyacides, acides carboxyliques ou des entités contenant des acides hydroxycarboxyliques. Le précurseur solide d'acide peut être mélangé avec un matériau solide réactif à l'acide afin d'accélérer l'hydrolyse et/ou revêtu afin de retarder l'hydrolyse. On donne aussi des composés liquides hydrosolubles qui accélèrent l'hydrolyse. Le procédé assure que l'acide contacte des faces de fracture loin du trou de forage.

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