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1. WO2009078745 - RÉGULATION DU REFLUX DES AGENTS DE SOUTÈNEMENT À L'AIDE DE MATÉRIAUX ADHÉSIFS ENCAPSULÉS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

We claim:

1. A method for creating a fracture in a subterranean formation comprising injecting a mixture of a proppant with an encapsulated tackifying compound, and allowing said tackifying compound to be released during or after fracture closure.

2. The method of claim 1 further wherein the tackifying compound release process is enhanced with pressure pulses.

3. The method of a claim 1 or 2 wherein the amount of encapsulated tackifying compound varies from 0.01 to 20 weight per cent relative to the proppant.

4. A capsule comprising a protective shell containing a tackifying compound.

5. The capsule of claim 4 wherein the tackifying compound comprises a material selected from at least one of polyamides; quaternized polyamides; polyesters; polycarbonates; polycarbamates; natural resins; acrylates; silylated polyamides; and mixtures thereof.

6. The capsule of claim 4 wherein the tackifying compound is non-hardening.

7. The capsule of claim 4 wherein the capsule size ranges from 0.25 mm to 3.36 mm, and the protective shell has a thickness in the range of 0.01 to 1 mm.

8. The capsule of claim 4 wherein the protective shell comprises a water-soluble polymer.

9. The capsule of claim 8 wherein the protective shell comprises a water-soluble polymer selected from at least one of a polysaccharide; a polylactide; a polyglycolide; a polyorthoester; a polyaminoacid, a polyactoacid, a polyglycolacid, a polyacrylamide, poly(ε-caprolactone); a chitosan; and mixtures thereof.

10. The capsule of claim 4 wherein the protective shell comprises an oil-soluble polymer.

11. The capsule of claim 10 wherein the protective shell comprises an oil-soluble polymer selected from at least one of a polyester; a polyolefins; a low density polyethylene; a high density polyethylene; a polypropylene; and mixtures thereof.

12. The capsule of claim 4 wherein the protective shell comprises an insoluble polymer compound selected from at least one of polyesters; polyacrylates; polyimides; phenol-aldehyde resins; fluoroplasts; polymethacrylates; polyvinylidene chlorides; polyvinylchlorides; and mixtures thereof.

13. The capsule of claim 4 further comprising at least one of a deformable material; a surfactant; a multifunctional material; a degradable material; a filler material; an inert filler material; and mixtures thereof.