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Methodology for determination of low-permeability reservoirs optimal development by wells with multi-stage fracturing

UDK: 622.276.66 СГ
Key words: Low-permeability reservoirs, depletion, techical-and-economical model, criteria for development efficiency, optimum recovery drive
Authors: A.N. Sitnikov, A.A. Pustovskikh, E.V. Belonogov, D.A. Samolovov (Gazpromneft NTC LLC, RF, Saint-Petersburg), N.S. Kubochkin (Tyumen State University, RF, Tyumen)
The purpose of this work is to identify the reservoir parameters at which efficiency of the line development system using horizontal wells with multi-stage hydraulic fracturing with waterflooding is lower that efficiency of the depletion drive development. This is related to drilling out reserves difficult to recover both in the new assets and in the edge areas of the old fields. In the last 10 years, the trend for impairment of reservoir characteristics has resulted in rapid development of horizontal well construction processes with multiple hydraulic fractures and their massive use for building development systems in the fields of Russian Federation. Physical phenomenon providing depletion’s advantages in comparison with waterflooding is time delay of production response to waterflooding increasing when coefficient of pressure conductivity decreasing, decreasing field pressure response per unit injected volume when total compressibility of system increasing. Analytical technical-and-economical model is developed in order to identifying the factors influencing on depletion and waterflooding economic efficiency. As follows from the analysis there are two factors: dimensionless well cost and relation of movable oil saturation to product of total compressibility of system and drawdown. Multivariate calculation data is summarized in the form of chart. Also numerical model which takes into account optimization of flow back duration is constructed. Numerical model is constructed for the purpose of improving permeability threshold value estimation derived from analytical model. As a result of analytical model analysis depletion’s advantages in comparison with waterflooding increase when oil net pay, oil mobility, total compressibility of system, total well cost is increased, net-back oil price is decreased and when abnormally high reservoir pressure is presented.

References

1. Khasanov M.M., Ushmaev O.S., Nekhaev S.A., Karamutdinova D.M., The

optimal parameters for oil field development (In Russ.), SPE 162089, 2012.

2. Belonogov E.V., Pustovskikh A.A., Samolovov D.A., Methodology for determination

of low-permeability reservoirs optimal development plan (In Russ.),

SPE 182041, 2016.

3. Prats M., Camacho-Velazquez R., Rodriguez F., One-dimensional linear flow

with constant terminal pressures, Journal of Canadian Petroleum Technology,

1999, V. 38, no. 13, pp. 1–6.

4. Khasanov M.M., Krasnov V.A., Korotovskikh V.A., Determination of the optimal

period of oil wells operation (In Russ.), Nauchno-tekhnicheskiy vestnik

OAO “NK “Rosneft'”, 2007, no. 5, pp. 19–21.

5. Sitnikov A.N., Pustovskikh A.A., Roshchektaev A.P., Andzhukaev Ts.V.,

Amethod to determine optimal switching time to injection mode for field development

system(In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 3,

pp. 84–87.

The purpose of this work is to identify the reservoir parameters at which efficiency of the line development system using horizontal wells with multi-stage hydraulic fracturing with waterflooding is lower that efficiency of the depletion drive development. This is related to drilling out reserves difficult to recover both in the new assets and in the edge areas of the old fields. In the last 10 years, the trend for impairment of reservoir characteristics has resulted in rapid development of horizontal well construction processes with multiple hydraulic fractures and their massive use for building development systems in the fields of Russian Federation. Physical phenomenon providing depletion’s advantages in comparison with waterflooding is time delay of production response to waterflooding increasing when coefficient of pressure conductivity decreasing, decreasing field pressure response per unit injected volume when total compressibility of system increasing. Analytical technical-and-economical model is developed in order to identifying the factors influencing on depletion and waterflooding economic efficiency. As follows from the analysis there are two factors: dimensionless well cost and relation of movable oil saturation to product of total compressibility of system and drawdown. Multivariate calculation data is summarized in the form of chart. Also numerical model which takes into account optimization of flow back duration is constructed. Numerical model is constructed for the purpose of improving permeability threshold value estimation derived from analytical model. As a result of analytical model analysis depletion’s advantages in comparison with waterflooding increase when oil net pay, oil mobility, total compressibility of system, total well cost is increased, net-back oil price is decreased and when abnormally high reservoir pressure is presented.

References

1. Khasanov M.M., Ushmaev O.S., Nekhaev S.A., Karamutdinova D.M., The

optimal parameters for oil field development (In Russ.), SPE 162089, 2012.

2. Belonogov E.V., Pustovskikh A.A., Samolovov D.A., Methodology for determination

of low-permeability reservoirs optimal development plan (In Russ.),

SPE 182041, 2016.

3. Prats M., Camacho-Velazquez R., Rodriguez F., One-dimensional linear flow

with constant terminal pressures, Journal of Canadian Petroleum Technology,

1999, V. 38, no. 13, pp. 1–6.

4. Khasanov M.M., Krasnov V.A., Korotovskikh V.A., Determination of the optimal

period of oil wells operation (In Russ.), Nauchno-tekhnicheskiy vestnik

OAO “NK “Rosneft'”, 2007, no. 5, pp. 19–21.

5. Sitnikov A.N., Pustovskikh A.A., Roshchektaev A.P., Andzhukaev Ts.V.,

Amethod to determine optimal switching time to injection mode for field development

system(In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 3,

pp. 84–87.



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