Analysis of schemes of perforation of bedded deposits on the basis of mathematical modeling
Limited hydrocarbon reserves force putting into development of new non-commercial multi-bedded oil fields where high permeability beds inter-stratify with low permeability beds. Well casing perforation is usually used for connecting a well with an oil bed. There arises some problem of efficient opening of multi-bedded oil fields by means of perforation. In case you want to increase a well flow-rate it is cost-efficient to develop all productive beds at once. However, sometimes perforating of thin low-permeable interstratified beds is inexpedient for providing of a well stable operation and for reducing the costs. To evaluate efficiency of stratified beds perforating the article suggests numerical algorithm based on the method of control volume, which envisages realization of perforation channels like linear singular flows. Various variants of beds perforating are analyzed by means of the developed algorithm and with the example of real stratified bed. Some formula for preliminary evaluation of an inflow share out of each bed in a summarized flow-rate of an oil field in case of complete perforation is proposed. Analysis of inter-flows' effect between neighboring beds on oil recovery is carried out.