Compositions and methods for removal of asphaltenes from a...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/524 (2006.01) E21B 37/06 (2006.01)

Patent

CA 2650336

Compositions are provided for removing an organic material, especially asphaltenes, from a portion of a wellbore or a subterranean formation. The composition comprises: (A) water; (B) an organic solvent blend further comprising: (i) a non-polar organic solvent; and (ii) at least two polar organic solvents; and (C) a surfactant adapted for forming an emulsion of the organic solvent blend and the water. According to another aspect of the invention, the compositions comprise: (A) water, wherein the water is greater than 25% by volume of the composition; (B) an organic solvent blend further comprising: (i) a non-polar organic solvent; and (ii) a polar organic solvent; and (C) a surfactant adapted for forming an emulsion of the organic solvent blend and the water. Methods are provided for removing an organic material from a portion of a wellbore or a subterranean formation. The method comprises the steps of: (A) forming a composition according to the invention; and (B) introducing the composition to the portion from which the organic material is to be removed.

La présente invention concerne des formules destinées à l'élimination d'un matériau organique, spécialement d'asphaltènes, d'une partie de forage ou de formation souterraine. Ladite formule comprend : (A) de l'eau ; (B) un mélange de solvants organiques comprenant en outre : (i) un solvant organique non polaire ; et (ii) au moins deux solvants organiques polaires ; et (C) un tensioactif adapté à la formation d'une émulsion à partir du mélange de solvants organiques et de l'eau. Selon un autre aspect de l'invention, les formules comprennent : (A) de l'eau, en proportion supérieure à 25 % en volume de la formule ; (B) un mélange de solvants organiques comprenant en outre : (i) un solvant organique non polaire ; et (ii) un solvant organique polaire ; et (C) un tensioactif adapté à la formation d'une émulsion à partir du mélange de solvants organiques et de l'eau. La présente invention concerne également des méthodes d'élimination d'un matériau organique d'une partie de forage ou de formation souterraine. La méthode comprend les étapes consistant à : (A) former une formule selon l'invention ; et (B) introduire la formule dans la partie où le matériau organique doit être éliminé.

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