Cooperation

Results on decreasing  the water cut.

Results on increasing the oil production.

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The Goal of the Technological Complex.

Technological Complex “KORNTECH” includes three basic technologies of physicochemical influence on the stratum in order to improve extraction of oil reserves.

Realization of these technologies should preferably be implemented at the areas with stratified structure at consistency of stratums’ components and interconnection between the zones of  extraction and pressurization with permeability equal to 50-100mD and more, at the effective layer width about 5 meters and more.

The Essence of the Technological Complex.

Basic Technologies

Hydrodynamic EOR Methods.

These methods consist in regulation of modes of extraction and injection procedures, including shutting some of the wells and bringing into work the others.   In many cases it’s more efficient to combine hydrodynamic methods with physicochemical ones by means of selective influence on separate layers of the stratum, using small volume fringes of chemical reagents, which change filtrating qualities in critical area of formation and/or cross-borehole area with simultaneous optimization of operating modes extracting and flooding wells, including shutting some of the wells and bringing into work the others.

As a result optimal use of stratum’s energy is provided due to its concentration in the zones of oil deposits with enhanced oil-bearing and involving into development dead spaces, which considerably reduce the risk of non-recoupment of investments.

Technology of Regulation of Filtration by Polymeric Suspensions (PS)

The technology is based on periodic injection into the injection well the suspension of high molecular water soluble particles with cross-linking agent in the inert liquid. Mode of suspension injection, the size and concentration of polymer particles are chosen due to the conditions of crack by polymer particles only available in critical zone of the injection wells.

The technology combines positive qualities of popular ways of regulating injectiviy profiles and polymer flooding. Realization of the technology determines preservation or increase of flooding intensity of low-permeability intervals of the stratum. Periodic treatment of pressure wells allows to continuously adjust the flooding process of heterogeneous stratum and provide non steady state of influence, which helps to enhance oil extraction factor.

Technology Regulating Filtration by Alcaline Polymer-Suspension Compositions

Deep penetrating treatment of critical areas of pressure wells by alkaline polymer-suspension composition allows to essentially increase current oil recovery of the oil wells by regulating profiles of water injection wells, setting filtration barriers on the paths of more intensive water travel injected into the stratum, additional oil wash off from the flooded intervals, seams and zones. The technology is obtained by means of creating structured viscoelastic systems due to addition of loamy, peat or chalky particles into polymer mortars, for instance, polyacrylamide (PAA). 

This technology differs from traditional polymer-dispersed system (PDS) by additional blending into composition of alkaline solution and bactericide. Addition of alkaline gives the following results: first of all, it increases the volume of cementing deposit as compared to PDS and, second of all, endows the system with bigger mobility.

According to the results of  experimental investigations on the models of  heterogeneous stratums, application of this technology provides the increase of the factors of oil extraction for 17-25% as compared to flooding. This increase is achieved as in low flooded, so in high flooded worked out intervals of the stratum.

Sites of Technological Complex Application and Technological Efficiency.

In table 1 the results of implementation of seepage regulating technologies at the oilfields of Nizhnevartovsk region are stated.

Results of Implementation of ÒÊ «KORNTECH» Technologies at the Oilfields of Nizhnevartovsk Region