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Microgels Technology


Innovative Microgel as Relative Permeability Modifier

Our Innovative Solution
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Lower Permeability to Water
Maintaining Permeability to Oil

Relative Polymer Modifiers are polymers or weak polymers gel that adsorbs onto the surface of pore spaces. RPMs are capable of selectively reducing relative permeability to water with little or no effect on oil flow.

In the presence of water in the pore space, a microgel could swell and adsorb onto the rock surface, while it collapses under capillary pressure with the water entrapped, resulting in reduced relative permeability to water and allowing oil to flow. RPM has the possibility to alter the wettability to a more water-wet situation as well as having some lubrication effects.

To Segregate Flow Pathways
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Our microgel size is larger than usual polymers, and have a narrow size distribution. It is a self-repulsive water-soluble material, which adsorbs onto rock surface with thickness equal to their diameter, to reduce permeability of water as a function of initial permeability in each layer. The developed viscosity of the crosslinked structure is low, thus increasing penetration into reservoir. Due to their size, the penetration in low perm layers is minimized.

 

Benefit

  • Can increase production due to decreasing weight of hydrostatic column, from less water production
  • Microgel is not sensitive to pH or variations in formation water salinity
  • Particle has long term stability in the formation
  • Can have a secondary effect of sand consolidation or diversion (in the right candidate)
 Application

  • Can be used in sandstone and carbonate reservoirs
  • Applicable in reservoirs with permeabilities up to 2 Darcy
  • Can be used in Enhanced Oil Recovery chemical flooding operations
  • Relative permeability modification or conformance control in the near wellbore region of oil or gas producing wells, and gas storage wells, of any configuration (most trajectories, and most completion types, such as open hole, cased hole, gravel packed etc)

Self Repulsive Water Soluble Material

Relative permeability modifier (RPM) is proven to be effective to control water production, increased hydrocarbon production, therefore prolonging the useful life of the reservoir.

Product Name Description
WaterCurb™ RPM WaterCurb™ RPM is a large and crosslinked microgel technology for water shut-off treatments and other conformance operations that reduces permeability of water and thus reduce water production.

Improve Production During the Effective Period of a Treatment

DOSAS presents an engineered approach to find appropriate chemical and/or mechanical solutions, formulation recommendations and treatment placement programs, can be designed to achieve the best results. The RPM process is a typical single well operation, usually involving four steps, including:

1. Preflush chemicals
2. Injecting RPM Polymers
3. Post-treatment fluid
4. Producing the oil