The Rosetta Resources CO2 Storage Project - A WESTCARB GeologicPilot Test Page: 3 of 4
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interbedded sand lenses. The top of the McCormick sand, a depleted water-drive reservoir at a slightly
greater depth of 1003 to 1021 m, is an alternative location for the gas reservoir test if the Capay sand
stringer is absent at the location of the new wells. The casing will be perforated in the gas zone after
completing the first experiment and cementing the well perforations to shut in the lower saline zone. CO2
will be purchased from a local supplier and trucked to the site for both pilot tests.
ENHANCED GAS RECOVERY
The second experiment consists of injecting CO2 into the depleted gas zone to assess the nature and extent
of reservoir pressurization and displacement of methane by CO2. The Rosetta Resources CO2 Storage
Project will be the first field-scale test used to demonstrate CO2 Storage with Enhanced Gas Recovery
(CSEGR). Depleted petroleum reservoirs are especially promising targets for CO2 storage because of the
potential to use CO2 to extract additional oil or natural gas. The benefit of enhanced oil recovery (EOR)
using injected CO2 to swell and mobilize oil from the reservoir toward a production well is well known.
CSEGR involves a similar CO2 injection process, but relies on sweep and methane displacement and has
received far less attention. Depleted natural gas reservoirs are not entirely devoid of methane, therefore,
CO2 injection may enhance methane production by reservoir repressurization or pressure maintenance.
PRELIMINARY RESULTS IN SUPPORT OF TEST DESIGN
Preliminary computer simulations were conducted using TOUGH2/EOS7C in support of the pilot tests at
the conceptual design level. The questions addressed at the conceptual design level include the following:
1. How much CO2 should be injected and at what rate?
2. What are the expected pressure and temperature changes in the reservoir associated with the injection?
3. What kind of monitoring and sampling should be conducted in the observation well?
Using preliminary estimates of homogeneous formation properties (permeability 10-1 m2 and porosity
35%), and boundary and initial conditions, preliminary simulations showed that breakthrough of
supercritical CO2 will occur during the saline test within 10 days at an observation well located 39 m from
the injector (Figure 4). Approximately 1800 tonnes of CO2 injected at a rate of 2 kg/s into the upper-most
4 m of the McCormick Sand is required to produce this result. In contrast, breakthrough of CO2 gas will
occur in the 2-3 m thick Capay
Time= 1 day X Shale gas interval containing
0. * methane at the same 39 m
E -20 0 e distance within a couple of
a __days (Figure 5) using far less
-40 CO2 (1000 tonnes injected at a
100 150 200 rate of 1.2 kg/s). Pressure
Tm = changes caused by injection are
T e I day0x 9 small in both cases (<0.3 bars)
a ; Iand temperature effects are
-2 a minimal.
5r1(00 1 5 20 0
T ime = 10o days xe
E -20 I II
50 100 150 200
Figure 4. Mass fraction of CO2 in
the gas (XgCO2) at three times
after injection into the upper-most
4 m of the McCormick saline
formation at a rate of 2 kg/s,
assuming radial symmetry.
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Trautz, Robert; Benson, Sally; Myer, Larry; Oldenburg, Curtis; Seeman, Ed; Hadsell, Eric et al. The Rosetta Resources CO2 Storage Project - A WESTCARB GeologicPilot Test, article, January 30, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc902111/m1/3/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.