Numerical simulation research and development practice of oil-gas transition zone in large overseas oilfields:Take the K OilField in Kazakhstan as an example
By discussing the mechanism of enhancing the development effect of barrier water injection in gas-cap reservoirs,this study analyzes the migration patterns of barrier water injection in the gas-top reservoirs,the realization of oil and gas separation,and the pressure matching factors.It is demonstrated by numerical simulation technology that establishing a water injection barrier at the oil-gas interface in gas-cap reservoirs can prevent mutual channeling of oil and gas.The simulation results show that in the early stages of water injection barrier formation,the injected water flows into the gas cap and the oil ring,respectively,replenishing the formation energy in the oil and gas areas.This not only effectively restrains the expansion of the gas cap but also slows down the migration velocity of the oil-gas interface,and reduces the gas-oil ratio in oil well production.When the water injection barrier is established,the injected water blocks the pathways between the oil and gas areas,thereby maintaining pressure balance ensuring production stability between the oil and gas areas,and enhancing the stability of the oil-gas transition zone and the overall recovery rate of the oil field.By optimizing the water injection parameters for the gas-cap oil ring barrier and integrating this with the development practice in the K Oilfield of Kazakhstan,the water injection barrier scheme with 150 m from the oil-gas boundary,400 m injection well spacing,and 200 m production well spacing,has been optimized.Not only does it ensure the reasonable exploitation of the oil and gas buffer zone,but also it makes full use of the gas cap energy,yielding positive application outcomes in the field practice.
gas cap reservoirhydrodynamic barriernumerical simulationoil-gas transition zone
NETL
NSTL
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