Title

Factors that Influence Gas Desorption in Unconventional Reservoirs

Presenter Information

Kewei Shi

Department

Geosciences and Geological and Petroleum Engineering

Major

Petroleum Engineering

Research Advisor

Wei, Mingzhen

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Funding Source

Opportunities for Undergraduate Experience Program (OURE)

Abstract

Unconventional gas reservoirs, which refer to coal bed methane and shale gas, are playing an increasingly important role in the energy supply in recent years. Gas in the unconventional reservoirs presents as free gas within the fractures and pores or as adsorbed gas in the rock matrix. During the production process, gas would be desorbed with the pressure depletion. This process has an obviously impact on the late time of gas production. Langmuir models are used in this report to simulate single component in the reservoir and 2D-EOS model is used to simulate high-pressure CO2 excess adsorption. There are several factors that influence gas desorption, such as permeability of fractures, components of the gas, reservoir pressures, etc. Although adsorbed gas makes up of a considerably amount of the gas-in-place, it is difficult to produce due to the ultra-tight rock matrix and relatively high bottom hole pressure. With the development technique so far, the economic values of desorption gas in moderate to deep shale gas plays may not be significant.

Biography

Kewei Shi is a senior of Petroleum Engineering and also a SPE member.

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hall

Presentation Date

16 Apr 2014, 1:00 pm - 3:00 pm

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Apr 16th, 1:00 PM Apr 16th, 3:00 PM

Factors that Influence Gas Desorption in Unconventional Reservoirs

Upper Atrium/Hall

Unconventional gas reservoirs, which refer to coal bed methane and shale gas, are playing an increasingly important role in the energy supply in recent years. Gas in the unconventional reservoirs presents as free gas within the fractures and pores or as adsorbed gas in the rock matrix. During the production process, gas would be desorbed with the pressure depletion. This process has an obviously impact on the late time of gas production. Langmuir models are used in this report to simulate single component in the reservoir and 2D-EOS model is used to simulate high-pressure CO2 excess adsorption. There are several factors that influence gas desorption, such as permeability of fractures, components of the gas, reservoir pressures, etc. Although adsorbed gas makes up of a considerably amount of the gas-in-place, it is difficult to produce due to the ultra-tight rock matrix and relatively high bottom hole pressure. With the development technique so far, the economic values of desorption gas in moderate to deep shale gas plays may not be significant.