Determination of Limit Water Cut of Technically Recoverable Reserves Calibrated by Water Drive Curve

doi:10.7657/XJPG20240607

Abstract

Abstract:

Water drive curve method is one of the important methods in dynamically calibrating recoverable reserves. This is a forward estimation method for water flooding reservoir without major adjustment measures and changing development modes, and with basically steady water flooding status. Setting the limit water cut at 0.98 lacks a solid scientific basis. Since the water drive characteristics vary significantly among different reservoirs, it is essential to select a water drive curve that best aligns with the reservoir’s actual behavior from the four water drive characteristic curves, rather than choosing the one with the lowest technically recoverable reserves, which will lead to weak reliability of calibration. Therefore, the four water drive characteristic curves and the production decline method were inverted and optimized for joint elimination, and a new relationship between water/liquid-oil ratio and production decline was established. This can determine the limit water cut and also ensure the uniqueness of the recoverable reserves calibrated by dynamic methods.

Key words: water drive characteristic curve, recoverable reserves calibration, limit water cut, production decline equation, water-oil ratio

CLC Number:

TE341

LIAN Jianwen, WANG Yaozong, YANG Jiguang. Determination of Limit Water Cut of Technically Recoverable Reserves Calibrated by Water Drive Curve[J]. Xinjiang Petroleum Geology, 2024, 45(6): 687-695.

Figures/Tables 12

Table 1.

Fig. 1.

Table 2.

Fig. 2.

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Fig. 3.

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Table 6.

Fig. 6.

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曲线类型	a	10^-3b	相关系数	按标准预测可采储量/10⁴ t	N_p与N_pfit相关系数
甲型	-0.685 7	3.906 4	0.976 1	1 131.931 0	0.451 0
乙型	2.242 2	1.284 6	0.975 9	1 545.824 0	0.176 3
丙型	0.437 4	0.836 3	0.996 9	1 083.899 5	0.433 2
丁型	1.067 1	1.005 5	1.000 0	957.687 4	0.955 1

递减类型	初始递减产量/10⁴ t	初始递减率	递减指数	按标准预测可采储量/10⁴ t	相关系数
指数递减	39.743 0	0.173 5	0	937.874 0	0.990 0
双曲递减	50.673 4	0.261 7	0.202 6	943.192 5	0.993 1
调和递减	-8.526 5	-0.309 7	1.000 0	959.158 9	0.909 4

曲线类型	a	10^-3b	相关系数	按标准预测可采储量/10⁴ t	N_p与N_pfit相关系数
甲型	-0.289 4	4.335 8	0.990 6	917.976 7	0.984 9
乙型	1.059 9	3.030 2	0.980 5	922.504 8	0.986 3
丙型	0.660 3	0.967 3	1.000 0	915.044 1	0.997 4
丁型	1.418 6	0.990 1	1.000 0	916.690 2	0.996 6

递减类型	初始递减产量/10⁴ t	初始递减率	递减指数	按标准预测可采储量/10⁴ t	相关系数
指数递减	65.079 9	0.260 3	0	1 012.602 5	0.983 3
双曲递减	90.742 3	0.457 5	0.265 1	1 021.500 6	0.993 6
调和递减	-20.705 5	-0.612 8	1.000 0	1 047.539 4	0.970 5

曲线模型	a	10^-2b	相关系数	按标准预测可采储量/10⁴ t	N_p与N_pfit相关系数
甲型	0.211 4	2.932 6	0.998 9	90.338 2	0.985 8
乙型	1.348 2	1.656 8	0.998 4	106.780 7	0.979 7
丙型	1.026 5	0.935 9	0.992 5	91.542 6	0.984 5
丁型	1.223 6	1.544 6	0.999 3	60.369 1	0.971 7