Patent ID: 7971659
Filing Date: 2011-07-05
Classification: C09K,Y02P

Abstract:
1. A method for supply a foaming composition to a downhole fluid comprising the steps of: inserting at least one capillary coiled tubing into a well borehole to a desired depth below a fluid level in the borehole and injecting an effective amount of a foaming composition to the fluid to produce a foam, where the foaming composition comprises from about 20 wt. % to about 80 wt. % at least one surfactant and from about 80 wt. % to about 20 wt. % at least one sulfur scavenging agent and optionally an additive, where the additive is selected from the group consisting of a carbon dioxide control agent, a corrosion inhibitor, a scale inhibitor, an oxygen control agent, a hydrocarbon dispersing agent and mixtures or combinations thereof, where the sulfur scavenging agent or the sulfur scavenging agent and the optional additive concentrate in bubble walls in bubbles in the foam, where the sulfur scavenger or the sulfur scavenger and the additive improve foam characteristics including foam stability and foam height, while simultaneously the resulting foam improves the activity of the sulfur scavenger or the activity of the sulfur scavenger and the additive, and where the effective amount is sufficient to decrease a fluid column weight increasing well fluids flow out of the well.