Ⅱ类广义气水混驱特征曲线的建立及应用

doi:10.7657/XJPG20240106

摘要/Abstract

摘要：

在Ⅱ类广义水驱特征曲线的基础上，引入了地下含气水率概念，类比建立了Ⅱ类广义气水混驱特征曲线。此类曲线对应的含气水变化规律数学模型在n、m取不同数值时，不仅可以转化为S型含气水变化规律，而且也可以转化为描述凸型、S-凸型、S-凹型、凹型等不同形态的含气水变化规律，丰富了气水混驱油藏开发效果评价方法。给出了Ⅱ类广义气水混驱特征曲线通式及其对应的含气水变化规律数学模型的求解方法，并分别评价了葡北油田三间房组油藏气水交替混相驱和锦州油田S31油藏气顶+边水混驱的开发效果，拟合精度较高，可供其他油藏开发借鉴。

关键词: 葡北油田, 锦州油田, 气水混驱油藏, Ⅱ类广义气水混驱特征曲线, 地下含气水率, 变化规律, 数学模型

Abstract:

Based on the Type Ⅱ generalized water drive characteristic curve，the concept of underground gas-water cut was introduced，and the Type Ⅱ generalized gas-water miscible flooding characteristic curve was established on the basis of analogy. The mathematical model of gas-water cut corresponding to the Type Ⅱ generalized gas-water miscible flooding characteristic curve can be transformed to describe the S-shaped gas-water cut variation and also the convex，S-convex，S-concave，concave，and other shapes of gas-water cut variations，when the characteristic values n and m take different values. This provides additional methods for evaluating development effects of gas-water miscible flooding. The paper put forward a general formula for the Type Ⅱ gas-water miscible flooding characteristic curve and corresponding methods for solving the mathematical model of gas-water cut，and evaluated the development effects of the water-alternating-gas miscible flooding in the reservoir of Sanjianfang formation in Pubei oilfield and the gas cap + edge water miscible flooding in S31 reservoir in Jinzhou oilfield，respectively，showing a high fitting accuracy. This work provides a valuable reference for developing other oil reservoirs.

Key words: Pubei oilfield, Jinzhou oilfield, gas-water miscible flooding reservoir, Type Ⅱ generalized gas-water miscible flooding characteristic curve, underground gas-water cut, variation, mathematical model

中图分类号:

TE341

褚夫建, 苟拓彬, 韩跃涛, 高文君. Ⅱ类广义气水混驱特征曲线的建立及应用[J]. 新疆石油地质, 2024, 45(1): 47-52.

CHU Fujian, GOU Tuobin, HAN Yuetao, GAO Wenjun. Establishment and Application of Type Ⅱ Generalized Gas-Water Miscible Flooding Characteristic Curve[J]. Xinjiang Petroleum Geology, 2024, 45(1): 47-52.

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类型	a	b	m	n
凸型	0.019 5	0.097 3	0	1.000 0
S-凸型	0.156 4	0.062 6	0	0.125 0
S型	0.253 5	0.037 6	0	0
S-凹型	0.310 0	0.046 7	0.125 0	0
凹型	0.401 2	0.061 4	1.000 0	0

类型	a	b	m	n	采收率/%	拟合相关系数
凸型	9.484 9	9.450 1	0.009 8	0.808 0	38.70	0.999 5
S-凸型	5.295 8	5.146 5	0.013 3	0.195 2	40.60	0.999 5
S型	1.588 2	1.333 7	0.029 1	0.002 1	39.33	0.999 8
S-凹型	0.548 5	0.244 7	0.193 9	0.016 6	41.85	0.999 5
凹型	0.420 6	0.064 6	0.867 5	0.008 9	41.00	0.999 3

含气水变化规律	m	n	a	b	拟合相关系数
直接法	0.861 2	0.022 3	0.403 9	0.050 4	0.999 3
间接法	0.851 8	0.024 9	0.401 8	0.049 5	0.999 9

含气水变化规律	m	n	a	b	拟合相关系数
直接法	0.114 8	0.955 3	1.306 5	1.218 9	0.990 0
间接法	0.133 2	1.395 4	1.366 5	1.332 7	0.999 0