Establishment of the characteristic chart for CO<sub>2</sub> near-miscible flooding of peripheral oilfields in Daqing

WANG Xin; LI Min

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Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing
Vol. 10, Issue 3, Pages: 45-50(2020)
Published：2020
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DOI：

WANG Xin, LI Min. Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(3): 45-50. DOI：

摘要

针对目前大庆外围油田CO

驱油区块采收率主要通过数值模拟方法进行预测、缺乏适合的经验公式等问题

建立了基于大庆外围油田基础物性和流体PVT参数的混相、近混相、非混相驱非均质理想模型

定义了含碳率-累产油、A型、B型三种CO

驱特征曲线

利用特征曲线预测模型中的采收率

优选出适合CO

近混相驱的特征曲线计算方法。在此基础上

建立了适合S区块的含碳率和采出程度图版

并与S区块实际动态相比较

选取A型气驱特征曲线进一步建立了CO

近混相驱特征图版

应用改进后的图版预测了S区块CO

驱采收率。结果表明:运用CO

近混相驱特征图版预测的采收率与S区块现场预测的采收率比较接近

此方法可以简单快捷预测CO

驱采收率

同时为S区块以及类似区块下一步的开发及评价提供参考。

Abstract

At present

the oil recovery in the CO

oil displacement area of the peripheral oilfields in Daqing is mainly predicted by numerical simulation with no empirical formulas. In order to solve this problem

firstly

an heterogeneous ideal model of miscible

near-miscible and immiscible by CO

flooding based on the basic physical properties and PVT parameters of the peripheral oil field in Daqing oilfield is established. Secondly

three kinds of characteristic curves of CO

flooding are defined

including carbon content-accumulation of oil

type A and type B. The feature curve is used to predict the r

ecovery rate in the model

and the calculation method of characteristic curve suitable for CO

near-miscible flooding modes is optimized. On this basis

the carbon content and recovery degree chart suitable for S block is established

and compared with the actual performance of S block. A-type gas drive characteristic curve is selected for the further establishment of the CO

near-miscible drive chart

and this improved chart is applied to predict the recovery rate of S block. The results show that the recovery rate predicted by the CO

near-miscible flooding chart is close to that predicted by the field test of S block. This method can predict the recovery rate of CO

flooding simply and quickly

and has guiding significance for the next development and evaluation of S block and similar blocks.

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Establishment of the characteristic chart for CO2 near-miscible flooding of peripheral oilfields in Daqing

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摘要

Abstract

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Keywords

references

Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing