水驱曲线标定技术可采储量的极限含水率

doi:10.7657/XJPG20240607

摘要/Abstract

摘要：

在动态法标定可采储量中，水驱曲线法是一种重要的方法。该方法是注水油藏不采取重大调整措施、不改变开发方式、水驱状况基本保持稳定时的向前预测，其将极限含水率标准定为0.98，缺乏科学依据。不同油藏的水驱规律存在很大差异，应在4种水驱特征曲线中选择最接近油藏实际的水驱规律，而不是以技术可采储量最低去选择，造成标定的技术可采储量可靠性不强。为此，将4种水驱特征曲线和产量递减法进行反演优选和联合消元，形成新的水（液）油比与递减产量关系式，不仅可以确定极限含水率，也实现了动态法标定技术可采储量结果的唯一性。

关键词: 水驱特征曲线, 可采储量标定, 极限含水率, 产量递减方程, 水油比

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

中图分类号:

TE341

连建文, 汪耀宗, 杨继光. 水驱曲线标定技术可采储量的极限含水率[J]. 新疆石油地质, 2024, 45(6): 687-695.

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.

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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