Process for treating an underground formation

Details Process for treating an underground formation Process for treating an underground formation

E - Fixed Constructions

21

B

E21B 43/02 (2006.01) C09K 8/56 (2006.01)

Patent

CA 2624791

A process for consolidating an underground formation is described, which process comprises: (a) incorporating into a treatment fluid (i) at least one chemical substance which is capable of undergoing a chemical change that alters the physico-chemical environment of the treatment fluid and which is a bicarbonate or a compound that generates a phosphate, phosphoric acid, sulphate, sulphuric acid, hydrogen sulphide, S2-,carbon dioxide, bicarbonate, base or acid; and, optionally, (ii) at least one additional chemical substance selected from salts and complexes of metals in which the metal has a valency of (2) or higher; (b) introducing the treatment fluid into the formation; and (c) allowing the chemical substance (i), alone or in combination with the optional chemical substance (ii), to undergo a chemical change that alters the physico-chemical environment of the treatment fluid such that a consolidating mineral is deposited in the underground formation. When the process is conducted during drilling, the additional chemical substance (ii) may alternatively be a silicate.

Cette invention concerne un procédé permettant la consolidation d'une formation souterraine, comprenant les étapes consistant à : (a) incorporer, dans un fluide de traitement, (i) au moins une substance chimique capable de subir une modification chimique qui modifie l'environnement physico-chimique du fluide de traitement et étant soit un bicarbonate soit un composé générant un phosphate, acide phosphorique, sulfate, acide sulfurique, sulfure d'hydrogène, S2-, dioxyde de carbone, bicarbonate, base ou acide ; et, de façon optionnelle, (ii) au moins une substance chimique supplémentaire sélectionnée parmi les sels et complexes de métaux dans lesquels le métal a une valence de (2) ou plus ; (b) introduire le fluide de traitement dans la formation ; et (c) permettre à la substance chimique (i), seule ou en combinaison avec la substance chimique optionnelle (ii), de subir une modification chimique qui transforme l'environnement physico-chimique du fluide de traitement de telle manière qu'un minéral consolidant est déposé dans la formation souterraine. Lorsque le procédé est mis en oeuvre pendant le forage, la substance chimique supplémentaire (ii) peut aussi être un silicate.

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