PJSC TATNEFT's TatNIPIneft experts developed EOR technology using integrated formation stimulation by means of the compositions based on microdispersed silica gels.

The technology has been designed for the oil fields at the late stage of development, having heterogeneous permeability reservoirs. The reservoir stimulation is carried out using the composition made up of two stepwise slugs. Firstly, microdispersed silica gel is injected (silica gel particles size is less than 5 µM). Silica gel microdispersion is derived from the sodıum silicate water solutions and HCl providing the blocking of water saturated intervals at the reservoir depth zones. Then the composition is injected to enhance oil recovery at the less permeable oil saturated interlayers.

The technology is covered by the Russian Federation patent No. 2483202 (the patent holder is PJSC TATNEFT n.a. V.D. Shashin).

The advantages of this technology include usage of inexpensive and easily available domestic chemicals; high efficiency; opportunity to stimulate reservoir depth zones by the microdispersed compositions; usage of the water with any level of mineralization; ecological safety for the environment and for the human.

PJSC TATNEFT has been introducing the technology in its oil fields on an industrial scale since 2014. The technical efficiency duration is equal to 1.5-3 years.

The technology was awarded the competition Grand Prix of the 'Oil and Gas. Petrochemicals - 2015' international specialized exhibition in the 'Enhanced Oil Recovery' nomination.

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