Analysis & Experiment
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Special Core Analysis (SCAL)
Our team provides oil and gas, exploration and production customers with Total Quality Assurance SCAL Core Evaluation services. We support our upstream clients, the laboratory tests cores for geological and reservoir properties, along with petrographic studies, providing a more detailed understanding and evaluation of reservoir formations.
Our special core analysis (SCAL) measurement capabilities are Wettability Determination, Relative Permeability Effects, Fluid Compatibility, NMR Core Analysis, Capillary Pressure, Pore Volume Compressibility and more.
DOSAS’ Laboratory Support
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The study of simulation program and laboratory includes the following steps:
- In-vitro Gel Stability Tests
- Core analysis and preparation
- Core-flood experiments
- Subsurface model building and calibration
- Simulations with integration of laboratory outputs
- Production forecasting to evaluate effect of treatment
Laboratory Experiments
To fully describe the behaviour of products the minimum set of tests depends on the solution type and consists of following steps:
| — | Gel Kinetics
Gel kinetics tests provides times of hydration, gelation and viscosity development. These parameters are important for designing the treatment volume, desirable injection rate and time limitations, as well as prove gel performance under test conditions. |
— | Grade Selection and In-Vitro Microgel Tests
Montagel grade selection is made from reservoir data (temperature, salinity), To check stability, Montagel is prepared and aged in an oven at reservoir temperature and salinity. At given intervals of time each tube is analyzed by visual observation and viscosity measurements. |
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| — | Core-flood Experiments
Coreflood experiments aim to measure the polymer data set as injectivity, dynamic adsorption, mobility and permeability reductions, RPM behaviour and gel strength. Coreflood tests have to be performed to evaluate microgel behaviour in reservoir rock and at reservoir conditions, in main producing intervals surrounding the wellbore. |
— | Stability Tests
Stability tests look into gels prepared in the laboratory and aged at elevated temperatures using evacuated oxygen free, flame-sealed glass ampoules for the recommended concentrations. This type of test is usually done at the development stage of the product and not routinely for each field. |
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| — | New Simulation Runs
Laboratory outcome data (adsorption, Mobility and permeability Reduction) are used as input data for new reservoir simulations, to evaluate treatment efficiency with actual Montagel behaviour in reservoir conditions. These simulation runs are expected to provide a more reliable estimate of treatment performances. |
— | Gel Strength
Gel strength determines the viscosity of gel solution, rheological characteristics and penetration depth. |
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| — | Brine compatibility
Brine compatibility performed to test how brine salinity (concentration and type of ions present) affects polymer hydration, crosslinking etc. Some PAM are sensitive to Ca2+ and Mg2+ present in brine. In the presence of divalent cations, particularly those defining water hardness (Ca2+ and Mg2+), polyacrylamides will degrade at temperatures greater than 160 oF (71 oC). The nature of the degradation is a reaction of the divalent cations with the acrylate groups, rendering the polymer less soluble, and precipitating it from the gel. |
Reservoir Fluids Testing and Evaluation
- Black Oil studies
- Condensate studies
- High pressure and temperature analysis up to 20,000 psi and 400F
- Compositional analyses to C-36+ (extended range to C-70 is available)
- Constant composition expansion with relative volumes
- Viscosity measurements using capillary viscometers
- Differential liberation (black oil) or constant volume depletion (condensates)
- Swelling studies and mixing studies, used primarily for gas injection or improved oil recovery (IOR) operation