Study on the perfection and optimization of development well pattern of Sha-2 member of C1 unit
In order to solve the problems of thin reservoir,low formation pressure and incomplete well pattern in some areas in Unit C1,this paper established a numerical simulation model to simulate the uncontrolled ar-ea of small formations No.2 and 3 of member C1,which could improve the well pattern in this area and opti-mize the well distribution principle.Then the development effect of the used block could be improved by opti-mizing the way of the next development and the amount of injected components.The numerical simulation re-sults showed that when the well thickness was more than 3.2 m,the side well located in the lower part of the reservoir was the best,while the inner well was located in the upper part of the reservoir was the best.The dis-tance from the side water should be greater than 180 m,the length of the horizontal section should be about 180 m,and the steam injection intensity in the early stage of steam huff and puff should be about 10 t/m.In the late stage of steam huff and puff,the steam injection volume should be increased by 5%cycle by cycle.Under the present situation,pre-nitrogen energy enhancement and anti-channeling+accompanied nitrogen injection had the best effect on expanding steam swept volume,and the optimal dosage was 60 000 m3 of pre-nitrogen+60 000 m3 of accompanied nitrogen injection.According to the field practice results,the daily oil of a single well in the new well pattern was 11.5 t/d,and the daily oil of a single well in the old well pattern was in-creased by 6.59 t/d.So this study has a good experience to subsequent development of other blocks.
heavy oil thermal recoverynumerical simulationwell pattern improvementmining mode opti-mixationparameter optimization
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