Class VI Database project: Drill-stem test data from Sweetwater County, Wyoming, USA.

Area of Science:

• Geoscience
• Petroleum Engineering
• Carbon Sequestration

Background:

• Legacy drill-stem test (DST) data are crucial for understanding subsurface reservoir properties.
• Digitizing and analyzing historical DST reports enhances subsurface characterization.
• The Greater Green River Basin holds significant potential for energy resources and carbon storage.

Purpose of the Study:

• To create a comprehensive digital dataset of legacy DST reports.
• To provide digitized raw time-series data and calculated in-situ reservoir pressures.
• To support Class VI carbon storage well applications and broader subsurface evaluations.

Main Methods:

• Collected and digitized 336 legacy DST reports from 192 wells in Sweetwater County, Wyoming.
• Applied Horner's analysis to calculate in-situ reservoir pressures from raw DST time-series data.
• Included well API numbers, locations, formations, depth intervals, and detailed test results.

Main Results:

• A digital dataset containing raw DST time-series data and calculated reservoir pressures.
• Detailed information on flow and shut-in periods, including time and pressure data.
• A valuable resource for regional pressure profiling and reservoir model validation.

Conclusions:

• The created dataset significantly aids the Class VI filing process for carbon storage.
• The dataset has broad applicability for conventional oil and gas, geothermal energy, and subsurface characterization.
• Facilitates enhanced resource evaluation and subsurface understanding in the Greater Green River Basin.