M.Khozyainov, D.Chernokozhev Dubna University Simulation of tracer filtration for investigation and production control at oil reservoirs

The oil all over the world is spent faster, than its stocks are increased during prospecting jobs. Thus new deposits of petroleum - basically small and average, large not it is a lot of, and giants absolutely no. The small and average deposits are characterized by high geological heterogeneity, that essentially complicates production of petroleum and reduces factor oil recovery. Due to the high price for petroleum on such deposits is profitable to apply special technologies of increase oil recovery. For effective application of methods of increase oil recovery it is necessary to investigate filtration flows on a maintained deposit of petroleum.

Optimum method of study filtration of flows is tracer method. The tracer method consists in addition of a label in water, pump to oil collector, both analysis of time of arrival and concentration of the indicator in a liquid, extracted from a petroleum layer. The indicator pump in one injection well, and is extracted from several production wells. Simultaneously in different injection wells can pump different indicators. It allows to receive distribution filtration of flows on the area of a petroleum deposit in some tens sq. kilometers. To receive such result it is possible with the help of the special software.

Thus this special software should be compatible to the standard software used for modeling of exploration of petroleum deposits on the geological data, received prior to the beginning exploration of oil deposit. The standard programs use for construction of geological-hydrodynamical model of a layer given, received prior to the beginning development. The tracer method allows to add geological-hydrodynamical model of a layer by results of researches received directly while in exploration of petroleum layer, i.e. when petroleum both water are in movement. Is the essentially new important information, which allows also to establish presence and productivity is extra penetration ways of a filtration. Let's consider some examples showing basic opportunities of a method.

Example 1. Let's consider a case of two zones located along a direction of a filtration of forced water. Injection is conducted in a point located on border of two zones. The curves " concentration of the indicator - time " for these cases are given which show, that the presence of two zones with various penetration located in a layer in parallel to a direction of a filtration, is determined, since distinction in penetration of these zones in 15 %. Researched site of a layerMagnitude of concentration of the indicator in extracted water Zone 1: permeability 1 mkm2, Zone 2: permeability 1,15 mkm2 The area of one zone 50 % of the common area of a site Zone 1: permeability 1 mkm2, Zone 2: permeability 1,4 mkm2, The zones have identical hydro conductivity

Example 2. Modeling replacement of petroleum by water with labeled substance on a site having local heterogeneity at the centre of a site was carried out (spent). As base of comparison the site, homogeneous on permeability is used. The results of modeling show, that the presence at the centre of a site completely of impenetrable zone results in later occurrence of the indicator in an production well, as water should be approached to her on longer ways, and to increase of the maximal concentration of the indicator, as разбавление occurs in smaller volume of a layer. These results show a basic opportunity of an estimation of size of scope of a layer influence by water on the tracer data and opportunity of revealing of the zones which have been not covered with exploration. Permeability 1 mkm 2 Zone 1: permeability 1 mkm 2, Zone 2: permeability 0 mkm 2, The area 1/9 from the common area of a site

Influence injection wells on share of water in production wells. forecastlive data

It is less – 70 more 70 Speed, meters / day Share of unproductively forced water filtered with various speeds

Influence of all injection wells on share of water in production wells

Distribution of permeability

Simulation of tracer filtration for investigation and production control at oil reservoirs University for Nature, Society and Man «Dubna» Russian Federation, Moscow region, Dubna, Universitetskaya street 19 Russian Federation, Moscow region, Dubna, Universitetskaya street 19 THANK YOU doctor of science, professor M. Khozyainov graduate student D. Chernokozhev