A study of methane emissions from orphan wells in Louisiana

  • 0Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA.

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Summary

This summary is machine-generated.

Methane emissions from Louisiana

Area Of Science

  • Environmental Science
  • Geoscience
  • Petroleum Engineering

Background

  • Orphan oil and gas wells pose environmental risks, including methane emissions.
  • The Louisiana Department of Energy and Natural Resources (LA DENR) implements well plugging and abandonment (P&A) programs.
  • Quantifying methane emissions from these wells is crucial for environmental management.

Purpose Of The Study

  • To analyze methane emissions from orphan oil and gas wells in Louisiana.
  • To assess the impact of various well and reservoir attributes on methane emission occurrence and magnitude.
  • To identify key factors influencing methane leakage from plugged wells.

Main Methods

  • Analysis of 600 well measurements from well-heads.
  • Statistical analysis including trend analysis, Chi-Square tests, Kruskal-Wallis tests, and analysis of covariance.
  • Compilation and analysis of well attributes: field, fluid type, age, depth, density, uncemented interval, reservoir pressure, production history, and borehole characteristics.

Main Results

  • Identified uncemented interval length, well age, time since production shut-down, borehole size, and perforation interval length as associated with methane emission occurrence and leak rate intensity.
  • Found that newer wells exhibit higher emission occurrence and greater magnitudes.
  • Analysis of covariance indicated an interaction between location and well density, supporting the significance of well age.

Conclusions

  • Specific well attributes significantly influence methane emissions from orphan wells.
  • Well age is a critical factor, with newer wells showing increased emissions.
  • Further research with larger datasets is recommended for more definitive conclusions on methane emissions from P&A wells.