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US 7,115,546 B2Granted
Acid diverting system containing quaternary amine
AssigneeBJ Services Company
InventorsQi Qu, David Alleman
Life of this patent
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Abstract
A process for stimulating a formation is disclosed wherein a diverting fluid is used to divert an acid treatment package from a high permeability or damaged portion of a formation to a low permeability or undamaged portion of a formation. The fluid, which preferably forms vesicles, comprises at least one surfactant, at least one quaternary amine polyelectrolyte, water, and a non-aqueous solvent.
Claims47
A viscoelastic fluid having a vesicle structure and comprising:
- (1) at least one amphoteric surfactant comprising lecithin, wherein the lecithin comprises phosphatidylcholine, phosphatidylethanolamine and phosphatidyllinositol, or mixtures thereof;
- (2) at least one quaternary amine polyelectrolyte;
- (3) water;
- and
- (4) a non-aqueous solvent.
2 more elements
A method for injecting a diverting fluid into a formation, comprising:
- (a.) providing a diverting fluid comprising vesicles;
- and
- (b.) injecting the diverting fluid into the formation;
- and further wherein the diverting fluid comprises:
- (1) at least one surfactant;
- (2) at least one quaternary amine polyelectrolyte;
- (3) water;
- and
- (4) a non-aqueous solvent.
6 more elements
A viscoelastic fluid having a vesicle structure and comprising:
- (1) at least one amphoteric surfactant which comprises a chemically or enzymatically modified lecithin;
- (2) at least one quaternary amine polyelectrolyte;
- (3) water;
- and
- (4) a non-aqueous solvent.
2 more elements
Dependencies are inferred from the claim text.