Wang, Jianwei (2008-12). Integrated Reservoir Characterization and Simulation Studies in Stripper Oil and Gas Fields. Doctoral Dissertation. Thesis uri icon

abstract

  • The demand for oil and gas is increasing yearly, whereas proven oil and gas reserves are being depleted. The potential of stripper oil and gas fields to supplement the national energy supply is large. In 2006, stripper wells accounted for 15% and 8% of US oil and gas production, respectively. With increasing energy demand and current high oil and gas prices, integrated reservoir studies, secondary and tertiary recovery methods, and infill drilling are becoming more common as operators strive to increase recovery from stripper oil and gas fields. The primary objective of this research was to support optimized production of oil and gas from stripper well fields by evaluating one stripper gas field and one stripper oil field. For the stripper gas field, I integrated geologic and engineering data to build a detailed reservoir characterization model of the Second White Specks (SSPK) reservoir in Garden Plains field, Alberta, Canada. The objectives of this model were to provide insights to controls on gas production and to validate a simulation-based method of infill drilling assessment. SSPK was subdivided into Units A ? D using well-log facies. Units A and B are the main producing units. Unit A has better reservoir quality and lateral continuity than Unit B. Gas production is related primarily to porosity-netthickness product and permeability and secondarily to structural position, minor structural features, and initial reservoir pressure. For the stripper oil field, I evaluated the Green River formation in the Wells Draw area of Monument Butte field, Utah, to determine interwell connectivity and to assess optimal recovery strategies. A 3D geostatistical model was built, and geological realizations were ranked using production history matching with streamline simulation. Interwell connectivity was demonstrated for only major sands and it increases as well spacing decreases. Overall connectivity is low for the 22 reservoir zones in the study area. A water-flood-only strategy provides more oil recovery than a primary-then-waterflood strategy over the life of the field. For new development areas, water flooding or converting producers to injectors should start within 6 months of initial production. Infill drilling may effectively produce unswept oil and double oil recovery. CO2 injection is much more efficient than N2 and CH4 injection. Water-alternating-CO2 injection is superior to continuous CO2 injection in oil recovery. The results of this study can be used to optimize production from Garden Plains and Monument Butte fields. Moreover, these results should be applicable to similar stripper gas and oil field fields. Together, the two studies demonstrate the utility of integrated reservoir studies (from geology to engineering) for improving oil and gas recovery.
  • The demand for oil and gas is increasing yearly, whereas proven oil and gas
    reserves are being depleted. The potential of stripper oil and gas fields to supplement the
    national energy supply is large. In 2006, stripper wells accounted for 15% and 8% of US
    oil and gas production, respectively. With increasing energy demand and current high oil
    and gas prices, integrated reservoir studies, secondary and tertiary recovery methods,
    and infill drilling are becoming more common as operators strive to increase recovery
    from stripper oil and gas fields. The primary objective of this research was to support
    optimized production of oil and gas from stripper well fields by evaluating one stripper
    gas field and one stripper oil field.
    For the stripper gas field, I integrated geologic and engineering data to build a
    detailed reservoir characterization model of the Second White Specks (SSPK) reservoir
    in Garden Plains field, Alberta, Canada. The objectives of this model were to provide
    insights to controls on gas production and to validate a simulation-based method of infill
    drilling assessment. SSPK was subdivided into Units A ? D using well-log facies. Units A and B are the main producing units. Unit A has better reservoir quality and
    lateral continuity than Unit B. Gas production is related primarily to porosity-netthickness
    product and permeability and secondarily to structural position, minor
    structural features, and initial reservoir pressure.
    For the stripper oil field, I evaluated the Green River formation in the Wells
    Draw area of Monument Butte field, Utah, to determine interwell connectivity and to
    assess optimal recovery strategies. A 3D geostatistical model was built, and geological
    realizations were ranked using production history matching with streamline simulation.
    Interwell connectivity was demonstrated for only major sands and it increases as well
    spacing decreases. Overall connectivity is low for the 22 reservoir zones in the study
    area. A water-flood-only strategy provides more oil recovery than a primary-then-waterflood
    strategy over the life of the field. For new development areas, water flooding or
    converting producers to injectors should start within 6 months of initial production. Infill
    drilling may effectively produce unswept oil and double oil recovery. CO2 injection is
    much more efficient than N2 and CH4 injection. Water-alternating-CO2 injection is
    superior to continuous CO2 injection in oil recovery.
    The results of this study can be used to optimize production from Garden Plains
    and Monument Butte fields. Moreover, these results should be applicable to similar
    stripper gas and oil field fields. Together, the two studies demonstrate the utility of
    integrated reservoir studies (from geology to engineering) for improving oil and gas
    recovery.

ETD Chair

publication date

  • December 2008