Wells – Processes – Distinct – separate injection and producing wells
Patent
1987-12-28
1989-03-21
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166273, 166274, 166294, 166300, E21B 33138, E21B 4322
Patent
active
048134848
ABSTRACT:
A process for generating gas in-situ where a decomposable chemical blowing agent is utilized in combination with an aqueous medium. When a slug of the aqueous medium containing said blowing agent is injected into the formation, heat from the formation, coinjected activators, reservoir fluids, or formation mineralogy causes said blowing agent to decompose thereby generating a gas. This gas forms bubbles which close pores in a more permeable zone of a formation which causes a drive fluid to be diverted into a less permeable zone for removal of hydrocarbonaceous fluids therefrom. Bubbles can also be formed by incorporating a water thickening amount of a water soluble polymer or gel into an aqueous medium containing a decomposable chemical blowing agent. A foam can be made in-situ by placing into an aqueous medium, a surfactant and a decomposable chemical blowing agent. In-situ generated bubbles or foam can be used to divert a drive fluid into a formation's less permeable zone.
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Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Suchfield George A.
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