Houston, TX 77005
3:00 p.m. Monday, Nov. 26, 2012
On Campus | Alumni
With increased attention on rising carbon dioxide levels, carbon capture and sequestration (CCS) has become a commonly proposed solution. Injection of acid gas has been studied for several decades for oil field applications, such as enhanced oil recovery (EOR), but is now being studied as a solution to climate change. This research aims to simulate underground conditions at injection sites, such as the pilot scale injection site located near the site of a coal fired power facility in the Black Warrior Basin of Alabama. This proposed CCS location will inject CO2, in a liquid into a carbonaceous saline aquifer. The objective of this study is to investigate carbonate surface treatments that alter the kinetics and mechanism of mineral dissolution resulting from the injection of an acid gas (CO2) into a geologic formation. A variety of mineral coatings are tested in an attempt to preserve mineral integrity under acidic conditions. Surface active chemicals were first tested, followed by a novel acid induced surface treatment that precipitates an inorganic layer on the calcite to preserve the acid soluble mineral. These experiments are the first to investigate the use of scale inhibitors for mineral preservation although found ultimately to have no impact on dissolution kinetics. Acid induced surface coatings were determined to be successful. Additionally, a novel flow through experimental apparatus was developed to simulate pressure and temperature conditions relevant to injection sites. Similar mineralogical studies in the literature studies have used pressurized, unstirred, batch systems simulate mineral interactions.