Experimental and Simulation Studies of Sequestration of Supercritical Carbon Dioxide in Depleted Gas Reservoirs

摘要

This paper presents experimental and simulation studies toevaluate the feasibility of sequestering supercriticalCO_2 indepleted gas reservoirs. Experimental results were simulatedto obtain gas-liquid relative permeability curves used in thefield simulation study.A 3D simulation model of one eighth of a 5-spot patternwas constructed to evaluate injection of supercritical CO_2under typical field conditions. Simulation results indicate thefollowing. First, a large amount of CO_2 in sequestered: about1.2 million tons in 29 years (40-acre pattern), and 4.8 milliontons in 56 years (80-acre pattern). Second, a significantamount of natural gas is also produced: about 1.3 BSCF or74% OGIP (40-acre pattern), and 4.9 BSCF or 68% OGIP (80-acre pattern). Third, at $2.00/MSCF, produced gas revenueamounts to about $2.6 million to $9.8 million, which couldhelp defray the cost ofCO_2 sequestration. In short,CO_2sequestration in depleted gas reservoirs appears to be a winwintechnology.