Simulation of development the oil parts of Urengoy field with impact on layer by various agents

Now the main methods of increase in oil recovery on fields of Russia and foreign countries are physical methods, such as layer hydraulic fracturing, construction of lateral horizontal trunks, radial opening oflayer. However these ways are directed to layer coverage increase by drainage, the oil replacement indicator in this case practically doesn't change; however has also defining value ofoil recovery. In this regard, studying of processes of replacement of oil by various agents is the actual direction of research of instruments of increase of a production of oil-gas condensate deposits.Features of modeling of development with application of gas agents of impact on layer with use of digital filtrational model and comparisonof results to a traditional method of maintenance of reservoir pressure and replacement of oil by pumping water are given in this work.
Materials and methods
For the solution of problems ofthe real work results of research of a geological structure of oil rims, properties of formation fluids have been used. Results of laboratory pilot studies of a core on definition of relative phase permeability with the subsequent use in the full-scale geological and hydrodynamic model of object providing the numerical solution of processes of a filtration at influence by various agents in system of maintenance of reservoir pressure are processed.
Results
On the basis of systematization of results of laboratory pilot studies on a core have been received relative phase permeability at realization of process of replacement by various agents who are used for performance of computing experiments on full-scale geological and hydrodynamic model of BU112 layer of the Urengoy field. What has provided increase of accuracy of forecasting of technological indicators of development with realization of gas methods of increase in oil recovery.
Сonclusions
As a result of performance of computing experiments it is established that the smallest gain is noted for option with reservoir pressure maintenance (RPM) inpumping water where final oil recovery factor has increased by 56,1%. Development with RPM in pumping nitrogen allows to increase final oilrecovery factor by 5,1% in comparison with options with pumping water, and RPM with pumping gas of separation to 3,7%. Increase of oil recovery factor is noted also in options with the organization of water gas influence which increase, concerning optionwith RPM water, has made 4,1, 6,0 and 9,7%, respectively, at various ratios of volumes of the downloaded agents of gas of separation and water 1:2, 1:1 and 2:1. Following the results of calculations the reservoir pressure by all options was established at the level of the current pressure, at the same time volumes of annual downloading the gas agent, in view of his big mobility, it is 3-4 times more than the volumes of water brought to sheeted conditions. At the same time, the gain of the taken stocks in options with RPM varied in the range of 55-75% in comparison with options on exhaustion. When comparing options with RPM the smallest gain has been received at pumping water.