近废弃油藏延长生命周期开发调整技术

doi:10.13809/j.cnki.cn32-1825/te.2024.01.017

Abstract

Abstract:

Facing the challenges of extremely high water cut, developed preferential channels, highly dispersed remaining oil, and strong heterogeneity in nearly abandoned reservoirs, the study focuses on the 4-5 layer series of the North Block II（Oil Group No. 2） in the Shuanghe Oilfield. By employing detailed reservoir geological modeling, numerical simulation methods, and microscopic displacement experiments, the distribution characteristics of remaining oil after polymer flooding were characterized. Post-polymer flooding, the remaining oil saturation is higher in areas away from the main streamlines on the macro scale, including non-mainstream areas, weak zones along main streamlines, and peripheral areas with larger injector-producer distances. Vertically, remaining oil tends to accumulate at the top of positive rhythm sequences. Microscopically, the remaining oil is primarily in the form of semi-bound state. Based on the characteristics of remaining oil distribution, a technical concept of heterogeneous composite driving and streamline well pattern densification adjustment was proposed. By adjusting the well pattern to alter streamlines, creating a staggered row and column well pattern with a change in streamline direction of over 30° and a streamline deflection rate of 80%, the effective mobilization of remaining oil is promoted. Numerical simulation predicts that this technique could increase the recovery factor by 10.96%, add 706.1 thousand tons of recoverable reserves, and extend the life cycle by 15 years. This offers a new technical approach for significantly enhancing the recovery factor of reservoirs after polymer flooding.

Key words: reservoir after polymer flooding, numerical simulation, remaining oil, encryption adjustment, heterogeneous composite flooding, enhanced oil recovery

CLC Number:

TE319

Lianfeng ZHANG,Yilin ZHANG,Huanhuan GUO, et al. Development adjustment technology of extending life cycle for nearly-abandoned reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 124-132.

Figures/Tables 9

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Table 1

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Table 2

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Table 5

References 21

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层位	地质储量/10⁴t	剩余储量/10⁴t	占总剩余储量比例/%	采出程度/%	剩余储量丰度/（10⁴t/km²）
Ⅱ4²	88.55	44.60	8.93	49.63	12.20
Ⅱ4³	122.40	82.84	16.59	32.32	16.40
Ⅱ4⁴	95.84	61.19	12.26	36.15	31.50
Ⅱ5¹	158.42	75.90	15.20	52.09	36.80
Ⅱ5²	157.79	78.25	15.67	50.41	39.70
Ⅱ5³	184.01	100.44	20.12	45.42	34.10
Ⅱ4¹	43.54	26.19	5.25	39.85	5.67
Ⅱ4⁵	10.47	7.29	1.46	30.37	3.12
Ⅱ5⁴	25.56	14.03	2.81	45.11	3.45
Ⅱ5^5-6	3.39	3.25	0.65	4.16	2.34
Ⅱ5^7-8	5.42	5.31	1.06	2.14	2.67
共计	895.40	499.30	100.00

层位	自由态		半束缚态			束缚态
层位	簇状	粒间吸附状	角隅状	喉道状	膜状	孔隙沉淀状	颗粒吸附状	狭缝状
Ⅱ4^2-3	7.2	15.3	12.6	2.8	34.5	7.2	19.1	1.4
Ⅱ4⁴	3.4	10.0	14.3	2.5	40.0	6.0	22.6	1.2
Ⅱ5¹	3.9	9.0	13.0	2.5	42.4	6.2	21.7	1.4
Ⅱ5²	2.7	11.0	12.8	2.5	35.9	6.7	27.0	1.3
Ⅱ5³	2.5	12.0	12.9	2.4	39.4	7.5	22.1	1.2
Ⅱ5⁴	5.7	10.8	13.3	2.5	37.4	7.0	22.0	1.3
平均值	4.2	11.4	13.1	2.5	38.3	6.8	22.4	1.3

驱替类型	采收率	剩余油含量	不同形态剩余油绝对含量
驱替类型	采收率	剩余油含量	簇状	粒间吸附状	膜状	喉道状	角隅状
水驱	47.96	51.23	24.84	18.20	8.37	1.38	3.44
聚合物驱	54.96	35.23	13.71	10.95	6.64	1.01	2.92
聚合物驱后二元复合驱	64.67	12.05	3.32	3.57	3.66	0.32	1.18
聚合物驱后非均相复合驱	78.32	5.60	1.76	1.21	1.64	0.30	0.69

切取机理模型	新钻油井/口	新钻水井/口	累增油/10⁴t	提高采收率/%
交错300 m×300 m			1.55	3.49
交错240 m×240 m	4		2.51	5.65
交错180 m×180 m	4	4	2.96	6.65
交错120 m×120 m	9	10	3.56	8.01
正对240 m×240 m	2	2	2.39	5.37
正对180 m×180 m	6	2	2.98	6.69
正对240 m×120 m	6	4	3.48	7.83
正对120 m×120 m	10	10	3.86	8.68

方案	控制储量/10⁴t	平均井距/m	新井/口	油转注/口	油井/口	注入井/口	控制程度/%	流线转向率/%
方案1	564.4	210	21	3	41	27	64.6	69.2
方案2	615.2	230	15	5	39	29	68.7	63.7
方案3	623.1	230	10	6	41	28	69.6	48.8
方案4	580.5	270	9	8	28	18	64.9	73.6
方案5	540.0	200×280	26	7	28	24	60.3	70.9
方案6	545.3	200×140	34	9	40	32	60.9	71.8
方案7	556.4	200×140	37	10	42	35	62.2	76.1
方案8	564.4	160×160	40	5	55	35	63.1	65.8
方案9	612.5	200×180	29	16	38	35	70.1	76.9
方案10	568.0	200×180	25	12	33	28	63.5	78.4
方案11	644.3	200×220	23	20	47	38	73.6	80.2

Development adjustment technology of extending life cycle for nearly-abandoned reservoirs

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