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Assesment of of CO2 EOR

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Title: Assesment of of CO2 EOR


1
Assesment of of CO2 EOR Sequestration
Potential in Gulf Coast Reservoirs
Mark H. Holtz, Vanessa Núñez López, and Caroline
L. Breton
2
Objectives
  • To develop a comprehensive data base for the Gulf
    Coast.
  • To apply our screening criteria to determine
    miscible CO2 EOR resource potential and CO2
    sequestration in the Gulf Coast.
  • To determine the geologic distribution of CO2 EOR
    potential in Gulf Coast oil reservoirs.

3
Current and Previous CO2 Pilots and Floods
4
Methodology
  • Sources of Data
  • Texas Atlas of Major Texas Oil Reservoirs,
    Atlas of Major Texas Gas Reservoirs, Railroad
    Commission of Texas, others
  • Louisiana and Mississippi TORIS database,
    others
  • Alabama Alabama Geologic Survey, others

5
Decision Tree for Screening Candidate Reservoirs
QAc4748x
6
Decision Flow Path for Play Determination
7
Recovery Efficiency of Sandstone Reservoirs from
Enhanced Oil Recovery Projects (1980s)
7
Single well huff n puff
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6
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5
14.5 , Paradis, LA, Texaco
4
Frequency
17, Little Creek, MS, Denbury (2004)
Quarantine Bay, LA, Chevron
3
2
1
0
0
6
1
2
1
8
2
4
3
0
3
6
4
2
Q
A
c
4
2
3
7
c
Recovery efficiency (percent)
8
Reservoir Screening for Candidate CO2-EOR Flood
Potential
  • Texas
  • Oil reservoir database developed for Texas total
    of 3,266 reservoirs.
  • Applied screening criteria for 21 Texas Gulf
    Coast counties and 33 North-Central and East
    Texas counties.
  • 360 candidates screened in Texas Gulf Coast 274
    candidates screened in North-Central and East
    Texas counties.
  • Louisiana
  • DOE TORIS database utilized to screen 122
    candidates.
  • Continued work with LA Geological Survey as part
    of DOE SE Regional Partnership.
  • Mississippi
  • DOE TORIS database utilized to screen 11
    candidates.
  • Current floods (Little Creek Mallalieu, West)
    located.
  • Continued work with Mississippi as part of DOE SE
    Regional Partnership.

9
Estimation of Minimum Miscibility Pressure, (MMP)
  • Non-linear regression for the molecular weight of
    the C5
  • Non-linear Multiple Regression for the Minimum
    Miscibility Pressure, (MMP)

Where MW Molecular weight of the C5 fraction
of the oil
T Reservoir temperature (F)
Temperature gradient linear regression used for
the Frio Plays 5, 6, 7, and 10
Temp (0.015)Depth(ft) 77.45
10
Storage Calculations
  • Quick Look (spreadsheet) Storage Potential
  • (Based on Cumulative Production (Np))
  • Gulf Coast Rules of Thumb

Formation Volume factors
50 recovery factor (variable)
15 recovery factor
11
Areas with Miscible CO2 EOR Potential
12
Candidate Reservoir Geologic Plays Distribution
South East Texas
13
Candidate Reservoir Geologic Plays Distribution
South East Texas
14
Miscible CO2 EOR resource potential in the Gulf
Coast
By State
15
CO2 Sequestration capacity in miscible oil
reservoirs along the Gulf Coast
16
Summary
  • Screening process identified all current and
    pilot reservoirs on the Gulf Coast.
  • All sizes of companies are beginning to
    capitalize on CO2 EOR.
  • Oil price and cost incentives are merging to form
    strong market conditions.
  • Pending legislation likely to influence market
    environment.

17
Thanks to Our GCCC Industry Partners

NRG
18
(No Transcript)
19
Technical Advances since the 1980s
  • 3D seismic for delineating fault blocks
  • Directional drilling for placing wells
  • Reservoir characterization for designing flood
  • Improved knowledge of CO2 flooding

20
Outline
  • Objectives
  • Methodology
  • Database
  • Screening Criteria
  • Minimum Miscibility Pressure
  • Storage Calculations
  • Results
  • Summary

21
Methodology
DECISION TREE FOR SCREENING CANDIDATE RESERVOIRS
22
Function for Obtaining Oil C5 Molecular weight

23
Recovery Efficiencies of Gulf Coast Sandstone CO2
EOR Pilots
Company Reservoir Flood type Recovery factor ( of OOIP)
Texaco Paradis Miscible Gravity Stable 15
Gulf/Chevron Quarantine Bay WAG 17
Chevron Timbalier Bay Gravity stable 23
Shell Weeks Island S Reservoir Gravity Stable 15
Denbury Little Creek Miscible CO2 17
24
Screening Criteria
  • Temperature gradient linear regression used for
    the Frio Plays 5, 6, 7, and 10
  • Non-linear regression for the molecular weight of
    the C5

Temp (0.015)Depth(ft) 77.45
25
Estimating CO2 Minimum Miscible Pressure
26
CO2 EOR Resource Potential in Texas
By Depositional System
27
Sequestration Potential in Texas
By Depositional System
28
Usage Potential in the Gulf Coast
By Depositional System
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