Purpose of Use of Self-diverting Acidic Composition
The technology of oil and gas production stimulation with self-deviating acidic compound FLUXOCORE® 210 grade C with gelling agent SURFOGEL® grade A is designed for the treatment of wells in carbonate fractured and porous fractured reservoirs with high heterogeneity of layers. The treatment can be held at the formation temperature up to 60 °C.
The process of oil production stimulation in carbonate porous fractured reservoirs with high-permeability zones in the producing formation is complicated with the fact that acidic compounds tend to acidize mainly the zones with high-permeability.
The most effective way to increase the acid treatment coverage is to divert the fluids with temporarily blocking compound based on gelling agent SURFOGEL® grade A. Blocking gel is formed directly in-place conditions while the process of acidic composition turning spent with the reaction of acid with formation. This allows to divert selectively the treating fluid to a less permeable area where the net of wormholes is formed. The wormholes are formed not only due to the heterogeneity of the reservoir but also due to redirecting the vector of effect on the rock by increasing the resistance of the gel.
In the presence of oil the gels are destroyed.
Application Area of Self-diverting Acidic Composition
Customer Benefits of Application of Self-diverting Acidic Composition
- Self-deviating acidic compound does not cause formation damage with colmatationg comparing with visco-elastic diverting fluids on polymer base.
Possibility of creating wide network of wormholes in the matrix not only due to the heterogeneity of the reservoir but also due to redirecting the vector of effect on the rock by increasing the resistance of the gel.
Enhancing the efficiency of usage of hydrochloric acid for the acid is not spent on cavity creation.
No need in keeping rapid speed of injection of self-deviating acidic compound, and thus no need in expensive specialized equipment.
It is possible to use self-deviating acidic compound when the coiltubing technologies are used. The viscosity of acidic compound FLUXOCORE® 210 grade C with diverting agent SURFOGEL®
grade A in its original state is about 20-30 mPa·s at the temperature of 20°C.
The possibility of regulating the ultimate viscosity of self-diverting acidic compsition containing diverting agent SURFOGEL®
grade A by changing its concentration depending on the geological conditions and objectives.
Process Technique for Self-diverting Acidic Composition
Well treatment technology implying gelling agent SURFOGEL® grade A supposes combined application of self-diverting acidic composition and FLUXOCORE® 210 grade C.
To select the optimal design of application of self-diverting acidic composition it is recommended to contact the specialists of Sales and Service Department of Polyex company.
The chemicals are certified for the application in oil and gas industry.