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EORI Library

EORI Library

The Enhanced Oil Recovery Institute (EORI) was created and is financially supported by the Wyoming State Legislature to work with Wyoming oil producers to increase oil production, and as result, increase tax revenues of the state.

EORI works to help the State of Wyoming and its energy producers to recover a large resource of stranded oil in depleted oil reservoirs as rapidly, responsibly, and economically as possible. 

As a part of our implementing our mission we have conducted and facilitated studies, presentations and other documents on the topic of Enhanced Oil Recovery (EOR). These documents are broken into subcategories to help you find the information pertinent to each topic. 




Enhanced Oil Recovery Institute of Wyoming documents, studies & presentations relating to the topic of economics.


Enhanced Oil Recovery Institute of Wyoming documents, studies & presentations relating to the topic of geology.


Enhanced Oil Recovery Institute of Wyoming documents, studies & presentations relating to the topic of engineering.


Enhanced Oil Recovery Institute of Wyoming documents, studies & presentations relating to the topic of regulations.


Enhanced Oil Recovery Institute of Wyoming documents, studies & presentations relating to the topic of data.


The purpose of this study was to report on the effectiveness of the Hyperscratcher tool in improving production or injection by cleaning out boreholes that have reported problems with scale, paraffin, or asphaltene build-up.

The Hyperscratcher tool was initially designed and used in California in the 1980s for workovers; as yet it has not been widely used in Wyoming.

Test results show use of the Hyperscratcher Tool significantly improved production in 7 of the 8 wells tested with production improvement varying from 20% to 120%.

Polymer-augmented waterflooding of the Minnelusa in Wyoming has proven to be a successful method for improving production in most cases compared to normal waterfloods. Polymer is a lowcost, low-risk option when considering a method for enhancing production of a particular field. Its primary function is to improve the mobility ratio of the injected water by increasing its viscosity, thereby improving the volumetric sweep and conformance within the reservoir.

Advantages of using polymer include: (1) low cost, (2) preventing early water breakthrough, (3) improving volumetric sweep and conformance, (4) increasing oilwater ratios, (5) mobilizing oil that would likely have been bypassed under normal waterflood conditions, (6) mitigating heterogeneous permeabilities within the reservoir, and (7) other enhanced oil recovery injection technologies can still be applied after the polymer flood. Most, but not all, Minnelusa fields examined exhibited improved recoveries using polymer compared to fields under conventional waterfloods. Uneconomical polymer floods can be caused by a variety of factors, chief of which is the failure to properly understand the internal architecture of the reservoir prior to initiating the flood.

Understanding the distribution of flow units within a field, designing an efficient well pattern that fits the geometry of the flow units, identifying the problems that a polymer needs to address, and selecting the proper polymer to address those problems are all key factors for optimizing any type of polymer-augmented flood.

The purpose of this survey is to provide a comprehensive status report of active CO2 EOR projects in the U.S., as of end-of-year 2019. This survey provides the first update of CO2 EOR project data since the final publication of the Oil & Gas Journal (OGJ) EOR Survey in 2014.

The 2019 U.S CO2 EOR survey shows that incremental oil recovery from CO2 EOR in the U.S. has held steady at approximately 300,000 barrels of oil per day. A total of 3.0 Bcf per day of CO2 is purchased for CO2 EOR, including 1.0 Bcf per day from “industrial” sources, which represents an increase of 30% over the last seven years.

Carbon management, in the form of CO2 capture and storage, is the most viable pathway to meeting significant carbon emission reduction targets over the next several decades. This survey demonstrates the value and potential of CO2 EOR to the overall carbon management strategy in the U.S.

Periodic updates will be made to this survey to include the latest CO2 EOR project data available. This publication is intended as a public resource for petroleum and energy industry stakeholders, and is offered free of charge by ARI. The next survey update is anticipated for Fall 2021.

Recent studies have shown that methane leak rates from abandoned oil and gas (AOG) wells may constitute a significant portion of a state’s emissions inventory. These emissions were shown to vary by region which introduces large uncertainty in the US national emissions inventory. In Wyoming, there are currently around 1900 wells identified as “orphaned” which indicates that they are both abandoned and unplugged. In this study, ten orphaned coalbed methane wells were sampled to characterize AOG emission rates in the Powder River Basin in Wyoming. The mean methane emission rate measured at these wells was 645 mg CH4/hr with the majority of these wells emitting in the 100-1000 mg CH4/hr range.

WPA Update
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Presentation October 2010 by Brian Jeffries.  Topics include Wyoming natural gas price compared to Louisiana gas price and more.

Niobrara Shales in Wyoming
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Presentation October 2010 by Andy Finley.  Topics include Niobrara Overview and more.

Presentation October 2010 by Bob Cornelius.  Topics include Transferring Gulf Coast CO 2 Success to the Rockies and more.

Presentation October 2010 by Tad True.  Topics include Logistical Constraints for Rockies’ Production, Getting Barrels out of the Rockies and more.

Questar Pipeline Company Update
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Presentation October 2010 by Gaylen Haag.  Topics include Questar Pipeline Updates, Expansion Projects and more.

Presentation 2010, Topics include WPA background, Corporate history of pipeline ownership and more.

Ruby Pipeline Update
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Presentation 2010, Topics include Ruby Pipeline Milestones, Certificate Highlights, Construction Highlights and more.

Presentation 2010, A trip through the history of pipeline expansion in the Rockies.

Crude Oil Update
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Presentation April 2010, Topics Include Crude Oil Prices for Select Hubs, Basis Cycles for Crude Oil, What is on the horizon and more.

Presentation at the 2011 Wyoming Oil and Gas Fair by Brian Jeffries, Wyoming Pipeline Authority.  Topics include Sources of State Revenues, Mineral Revenue Sources,  Mineral Revenue over the years and more.

Presentation at the 2012 Wyoming Oil and Gas Fair by Mick Urban, ONEOK Partners.  Topics include ONEOK’s current activities in the Rockies.