EORI Library

The North Cross (Devonian) Unit, currently operated by Occidental Oil and Gas, was discovered in 1944. The field was developed using regular 40 acre spacing and produced under primary recovery until 1964. Subsequently, a partial pressure maintenance program was constituted to inject residue gas in an updip location in the field. Large-scale continuous CO2 injection began in April 1972 and was expanded over time to provide CO 2 support throughout the field. The field has been under continuous CO 2 flood for over four decades. Currently, over 200% hydrocarbon pore volume (HCPV) of CO2 has been injected, and over 60% of the latest estimate of its target original-oil-in-place (OOIP) has been recovered. The field continues to perform well with a gross utilization (MCF CO2 injected/bbl oil recovered) of approximately 30 MCF/BO (20 MCF/BOE). North Cross is an excellent example of a successful mature continuous CO2 flood.

• CO2 Foam Stabilization using nanoparticles
• Numerical simulation of tight fractured gas reservoirs
• Process based models guided by seismic data
• Data-driven flood modeling/ management

• Data Driven Reservoir Management
• Development of a Fully Compositional Model for Timber Creek
• Impact of Primary Strata on Recovery Factors in Aeolian
• Systems
• Wertz Tensleep

This study will seek a methodology to improve (a) accuracy in estimates of oil recovery factors and (b) planning field development including well spacing and arrangement. Further, we will create and apply laboratory measurements to understand movement of petroleum fluids at small scales in order to better evaluate upscaling techniques and verify the underlying assumptions of previous works. The proposed study has the potential to impact reserves estimates and production in Wyoming, because it addresses phenomena that constitute bulk properties of all eolian reservoirs in Wyoming and their remaining reserves along with new fields that may be discovered in eolian system rocks such as the Tensleep, Minnelusa, Leo, and Navajo Sandstones.

During 2004-2010 the authors studied the sand dunes of Oman using trenches, OSL age dating and modern wind data. This work was supported by Petroleum Development Oman to define modern analogs for ancient dune reservoirs that produce oil and gas in the Sultanate. An unintended consequence of our work was the recognition of a band of high wind energy along the East Coast of Oman that might be suitable for commercial wind power extraction, especially during the peak wind season of the Indian Monsoon. Our geological work indicates that this basic wind regime has been in place for at least 200K years, and is thus not a fluke of modern times.

There are two main themes of this poster. The first theme is to provide an update on the stratigraphy and sedimentology of the Tensleep/Casper Formation of Southeast Wyoming (and parts of Northern Colorado), and oil production from these rocks. We incorporate new measured sections, stratigraphic analysis and petrographic work undertaken by the authors. To this end we created a new database in ArcGis (geographic information software) of tops and other information that updates the historical well database of the Wyoming Oil and Gas Commission archived in Casper. This new database has been used to create Common Risk Segment (CRS) maps of the Upper Tensleep oil play in Southeast Wyoming. These CRS maps indicate trends in Tensleep reservoir, charge and trap that are useful in planning further exploration. It is possible that use of advanced seismic techniques applied over the complex structural terrains in the identified high potential areas of SE Wyoming will produce new leads and ultimately, new discoveries.

A summary and quantification of the impact of EORI's contributions to the oil and gas industry in Wyoming.