| There are some problems in C2 block of K1g3 reservoir at present as follow.Well pattern density is small,Well pattern is not perfect,production rate is low,and reservoir development effect is poor.In order to solve these problems,a scheme for water injection development of reservoir,based on the optimization of the water injection technical system,is worked out in this paper by comprehensive application of reservoir engineering and numerical simulation methods.According to the static and dynamic data in the K1g3 reservoir C2 block,the technical policy of water injection development has been systematically optimized by using reservoir engineering method,such as development layer,injection and production Well pattern,oil recovery rate and injection pressure system.A reservoir numerical simulation model has been established and the production history has been fitted by utilizing the data from threedimensional geological model,core experiments,fluid experiments and production dynamics.According to the policy demonstration results of reservoir waterflooding,a scheme of reservoir waterflooding development is worked out.The production rate and injection production ratio have been optimized by using numerical simulation technology,and the best scheme is put forward.According to the prediction result of the best scheme,the economic benefit of the scheme is evaluated.The results show that: K1g3 reservoir is suitable for a set of layers and developed by using inverted seven-spot Well pattern.The reasonable Well spacing of the reservoir is 8.03 Wells/ km2,and the best scheme is that the production rate is 22 %,the injection-production ratio is 1.1,and the reservoir water recovery rate is 24.81%.The total design Well number is 59?39 oil Wells and 20 water Wells?,Among them,36 Wells were used and 23 new Wells were drilled and 23 new wells have been added.The final recovery percent can be increased by 8.11% and the financial internal rate of return is 22.2%. |
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