Influence of the system of areal placement of production and injection wells during the injection of nitrogen into the depleted gas reservoir on the gas recovery coefficient
The results of experimental and theoretical studies of the displacement of residual natural gas from depleted gas deposits by non-hydrocarbon gases are analyzed, and the use of nitrogen as a displacing agent is substantiated. The results of computer studies of areal injection of nitrogen into a hypothetical depleted gas reservoir are presented at 4, 5, 7 and 9 point well placement systems in the gas-bearing area and the distance from the central injection well to peripheral production wells 500, 750, 1000 and 1250 m.
The significant effect of the well placement system on the gas bearing area and the distance between the injection and production wells on the gas recovery coefficient for residual gas and the duration of the additional development period at the time of nitrogen breakthrough into production wells and the nitrogen content in reservoir production is 5 % vol. A wide range of changes in their values was obtained (for the gas recovery coefficient at the time of nitrogen breakthrough into production wells - from 6.92 to 56.44 %, for the duration of the deposit development process - from 4 to 49 months), which opens up possibilities for optimizing the system injection wells in the area of gas-bearing deposits, taking into account the technological and technical and economic indicators of additional development of the reservoir. The obtained results are recommended to be used when designing the areal injection of nitrogen for the conditions of a real depleted gas reservoir.
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