Establishment and Application of Type Ⅱ Generalized Gas-Water Miscible Flooding Characteristic Curve

doi:10.7657/XJPG20240106

Abstract

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

CLC Number:

TE341

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.

Figures/Tables 7

Table 1.

Table 2.

Fig. 1.

Table 3.

Fig. 2.

Table 4.

Fig. 3.

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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