Laboratory studies on the selection and testing of chemical compositions
Laboratory research
An integrated approach
Individual selection
Accurate results
Selection of chemical compositions
Each field (implementation target) has distinct reservoir and fluid compositions and properties, requiring a customized approach to selecting a chemical composition. Pre-selection of chemical composition samples is performed based on reservoir characteristics (temperature, permeability, mineralization, etc.).
To clarify and select the optimal composition in terms of technological efficiency and cost, it is necessary to conduct a series of laboratory studies.
Polymer flooding
Research in free volumes
Incoming inspection and characteristics
• Incoming inspection of polymers, determination of the main substance, characteristic viscosity, degree of hydrolysis, molecular weight of samples
• Determination of the dissolution time and the amount of undissolved sediment when dissolving the polymer in water from the PPD system
• Construction of rheological curves (determination of the dependence of the viscosity of a polymer solution on concentration and shear rate)
Stability and adsorption
• Evaluation of thermal and mechanical destruction of polymer solutions
• Determination of static adsorption of polymer samples
Filtration studies
Dynamic characteristics
• Evaluation of dynamic adsorption of polymer samples
• Determination of displacement coefficient, drag factor and residual drag factor
• Evaluation of the mechanical destruction of the polymer solution when passing through the pore space of the reservoir model
Surfactant-polymer flooding
When selecting a chemical composition for surfactant-polymer flooding, the following types of research are additionally carried out:
Research in free volumes
Surfactant Control and Compatibility
• Incoming inspection of surfactants, assessment of appearance, pour point, density, mass fraction of the main substance
• Assessment of the solubility and compatibility of surfactants with formation water and water from the reservoir pressure maintenance system
• Evaluation of compatibility with polymer
Interfacial characteristics
• Determination of the dependence of interfacial tension on surfactant concentration
• Assessment of phase behavior (determination of microemulsion types)
• Determination of thermal stability of surfactant-polymer composition
Filtration studies
Composition efficiency
• Determination of the displacement coefficient of a surfactant-polymer composition
• Determination of the OFP after injection of the composition
• Determination of dynamic adsorption of surfactant-polymer composition
* The above list is typical (it may be adjusted depending on the site conditions and project design)