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Influence of residual water saturation in near wellbore zone on productivity of production wells

UDK: 622.276.3
DOI: 10.24887/0028-2448-2017-9-90-94
Key words: formation damage, residual water saturation, wells production
Authors: M.V. Zaitsev (Oil and Gas Research Institute of RAS, RF, Moscow), N.N. Mikhailov (Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow), K.A. Sarbaev (Caspian State University of Technologies and Engineering named after S. Yessenov, the Republic of Kazakhstan, Aktau)

The influence of technological fluids filtrates on well productivity decrease is considered. There was established that natural residual water saturation of a layer changing due to filtrate penetration. It is determined that the technogenically modified residual water saturation consists of strongly bound (adsorbed) water saturation and conditionally mobile (capillary-jammed) water saturation. Such a structure of residual water saturation leads to changes in its values during well operation.

There suggested the models of residual water saturation changing under the action of a pressure gradient. The effects of a complex impact of jammed residual oil saturation and blocking of near wellbore part of formation as a result of colmatation on the values of the relative phase permeability are analyzed. The models taking into account the effect of these changes on the values of the relative phase permeability are proposed. There was developed a design model for taking into account the influence of a complex formation damage mechanism in near well-bore zones on well productivity. Analytic expressions for wells productivity in layers with an altered near wellbore zone are obtained.

The analysis of the obtained analytical solutions indicates a significant influence of considered factors on well productivity. The proposed solutions will make it possible to choose the way of action on near-wellbore zone adequately to its structure, to evaluate its efficiency, and to choose the optimal radius and intensity of the impact. The obtained results of the influence of jammed fluids will allow to estimate the productivity losses of the wells after putting them into operation after stopping.

References

1. Mikhaylov N.N., Physico-geological problems of additional recovery of residue oil in water-flooded reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1997, no. 11, pp. 14.

2. Mikhaylov N.N., New lines of the raising of an informativity of geological and hydrodynamic deposit simulation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 3, pp. 69–73.

3. Kochina I.N., Mikhailov N.N., Filinov M.V., Groundwater mound damping, International Journal of Engineering Sciences, 1983, V. 21, no, 4, pp. 413–421.

4. Mikhaylov N.N., Chumikov R.I., Efficiency analyses of development of small fields with hard to recover reserves in Tatarstan (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2010, no. 2, pp. 74–76.

5. Mikhaylov N.N., Chumikov R.I., The effect of capillary-pinched phases on the permeability of reservoirs in the continuous phase (In Russ.), Burenie i Neft', 2009, no. 7–8, pp. 27–28.

6. Mikhaylov N.N., Chumikov R.I., Experimental research of the capillary-pinched phases mobility (In Russ.), Vestnik TsKR Rosnedra, 2009, no. 5, pp. 42–48.

7. Zaytsev M.V., Mikhaylov N.N., Borehole zone effect on well deliverability (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2004, no. 1, pp. 64–66.

8. Melekhin S.V., Mikhaylov N.N., Experimental study of the residual oilmobilization at carbonate reservoirs flooding (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 8, pp. 72–76.

9. Mikhaylov N.N., Polishchuk V.I., Khazigaleeva Z.R., Modeling of residual oil distribution in flooded heterogeneous formations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 8, pp. 36–39.

10. Zaytsev M.V., Mikhaylov N.N., Effect of residual oil saturation on the flow through a porous medium in the neighborhood of an injection well (In Russ.), Izvestiya RAN. Mekhanika zhidkosti i gaza = Fluid dynamics, 2006, no. 4, pp. 93–99.

11. Dgemesuk A.V., Mikhailov N.N., Hydrodynamic models of the residual oil distribution in water-frood reservoirs (In Russ.), Izvestiya RAN. Mekhanika zhidkosti i gaza = Fluid dynamics, 2000, no. 3, pp. 98–104.

The influence of technological fluids filtrates on well productivity decrease is considered. There was established that natural residual water saturation of a layer changing due to filtrate penetration. It is determined that the technogenically modified residual water saturation consists of strongly bound (adsorbed) water saturation and conditionally mobile (capillary-jammed) water saturation. Such a structure of residual water saturation leads to changes in its values during well operation.

There suggested the models of residual water saturation changing under the action of a pressure gradient. The effects of a complex impact of jammed residual oil saturation and blocking of near wellbore part of formation as a result of colmatation on the values of the relative phase permeability are analyzed. The models taking into account the effect of these changes on the values of the relative phase permeability are proposed. There was developed a design model for taking into account the influence of a complex formation damage mechanism in near well-bore zones on well productivity. Analytic expressions for wells productivity in layers with an altered near wellbore zone are obtained.

The analysis of the obtained analytical solutions indicates a significant influence of considered factors on well productivity. The proposed solutions will make it possible to choose the way of action on near-wellbore zone adequately to its structure, to evaluate its efficiency, and to choose the optimal radius and intensity of the impact. The obtained results of the influence of jammed fluids will allow to estimate the productivity losses of the wells after putting them into operation after stopping.

References

1. Mikhaylov N.N., Physico-geological problems of additional recovery of residue oil in water-flooded reservoirs (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1997, no. 11, pp. 14.

2. Mikhaylov N.N., New lines of the raising of an informativity of geological and hydrodynamic deposit simulation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 3, pp. 69–73.

3. Kochina I.N., Mikhailov N.N., Filinov M.V., Groundwater mound damping, International Journal of Engineering Sciences, 1983, V. 21, no, 4, pp. 413–421.

4. Mikhaylov N.N., Chumikov R.I., Efficiency analyses of development of small fields with hard to recover reserves in Tatarstan (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2010, no. 2, pp. 74–76.

5. Mikhaylov N.N., Chumikov R.I., The effect of capillary-pinched phases on the permeability of reservoirs in the continuous phase (In Russ.), Burenie i Neft', 2009, no. 7–8, pp. 27–28.

6. Mikhaylov N.N., Chumikov R.I., Experimental research of the capillary-pinched phases mobility (In Russ.), Vestnik TsKR Rosnedra, 2009, no. 5, pp. 42–48.

7. Zaytsev M.V., Mikhaylov N.N., Borehole zone effect on well deliverability (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2004, no. 1, pp. 64–66.

8. Melekhin S.V., Mikhaylov N.N., Experimental study of the residual oilmobilization at carbonate reservoirs flooding (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 8, pp. 72–76.

9. Mikhaylov N.N., Polishchuk V.I., Khazigaleeva Z.R., Modeling of residual oil distribution in flooded heterogeneous formations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 8, pp. 36–39.

10. Zaytsev M.V., Mikhaylov N.N., Effect of residual oil saturation on the flow through a porous medium in the neighborhood of an injection well (In Russ.), Izvestiya RAN. Mekhanika zhidkosti i gaza = Fluid dynamics, 2006, no. 4, pp. 93–99.

11. Dgemesuk A.V., Mikhailov N.N., Hydrodynamic models of the residual oil distribution in water-frood reservoirs (In Russ.), Izvestiya RAN. Mekhanika zhidkosti i gaza = Fluid dynamics, 2000, no. 3, pp. 98–104.


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