Factors that Influence Gas Desorption in Unconventional Reservoirs
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
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.
