Riley Ridge Gas Plant
Capture, Transport and Storage: Denbury Resources
LOCATION: Wyoming, United States
CO2 capture source: Riley Ridge gas treating facility, Big Piney, Wyoming
CO2 storage site: CO2 would be distributed to a number of depleted oil fields in Wyoming
INDUSTRY (FEEDSTOCK): Natural gas processing (natural gas)
OVERALL PROJECT LIFECYCLE STAGE: Early development
CO2 CAPTURE CAPACITY VOLUME: 2.5 million tonnes per annum (Mtpa)
CAPTURE TYPE: Industrial separation
CAPTURE METHOD: Absorption chemical solvent-based process (Amine)
NEW BUILD OR RETROFIT: Retrofit (to an existing plant)
CO2 CAPTURE START DATE: 2020
PRIMARY STORAGE OPTION: Enhanced oil recovery
STORAGE FORMATION AND DEPTH: N/A
TRANSPORTATION TYPE: Pipeline (onshore to onshore)
TRANSPORTATION DISTANCE TO STORAGE SITE (LENGTH OF PIPELINE): N/A
Denbury Resources holds a 100 per cent working interest in the Riley Ridge Federal Unit in southwestern Wyoming and produces gas from the LaBarge field, the same field from which natural gas, helium and CO2 are produced at the Shute Creek Gas Processing Facility owned by ExxonMobil (see Shute Creek Gas Processing Facility description). In a series of two acquisitions in 2010 and 2011, Denbury acquired 100% of the operating interests in Riley Ridge. These purchases included a gas processing facility that was under construction at the purchase dates. The gas processing facility at Riley Ridge came into service in the fourth quarter of 2013 but has encountered a number of operational issues that have kept the facility from running at optimum levels.
Initially, the gas processing facility at Riley Ridge was designed to separate for sale the natural gas and helium from the full well stream, with the remaining gases, principally CO2, re-injected into the producing formation or a deeper formation. However, the main driver for Denbury acquiring Riley Ridge was to gain a source of CO2 for use in Denbury assets with high CO2-EOR potential in the Rocky Mountain region in Wyoming (with a new CO2 pipeline connecting Riley Ridge to Denbury's existing Greencore Pipeline).
Early development studies indicated initial CO2 capture capacity of up to 2.5 Mtpa and envisaged a 2015-17 start-up date though more recent plans are suggestive of a ~2020 development time-line. Denbury has indicated that the timing of project development is largely dependent upon future oil prices.