As part of the Southwest Regional Partnership for Carbon Sequestration (SWP), the Pump Canyon CO2-ECBM/sequestration demonstration in New Mexico has for objectives to prove the effectiveness of CO2 sequestration in deep, unmineable coal seams via a small-scale geologic sequestration demonstration.
At the demonstration site, a new CO2 injection well was drilled mid-2008 into the late-Cretaceous Fruitland coals within an existing pattern of coalbed methane production wells mainly operated by ConocoPhillips. CO2 injection in the three coal seams was initiated late July 2008 and stopped in August 2009. A variety of monitoring, verification and accounting (MVA) methods are being employed to track the movement of the CO2 to prevent any leakage. Some of the MVA methods include continuous measurement of injection volumes, pressures and temperatures within the injection well, coalbed methane production rates, pressures and compositions at the offset producer wells via CO2 sensors, tracers in the injected CO2, time-lapse vertical seismic profiling and surface Tiltmeter arrays amongst others. A detailed study of the overlying Kirtland shale is currently being conducted to investigate the integrity of this caprock. In addition, a detailed geologic characterization and reservoir modeling has been implemented in order to reproduce and understand the behavior of the reservoir.
As of now, the injection has ended and no CO2 breakthrough has occurred, classifying the small scale demonstration pilot as a success. This paper describes the project in details from the well construction to the different monitoring techniques used to prevent CO2 leakage as well as the results of the simulation model.