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

摘要/Abstract

摘要：

针对近废弃油藏特高含水、优势通道发育、剩余油高度分散、非均质性强等主要矛盾，以双河油田北块Ⅱ（2油组）4—5层系为例，采用油藏精细地质建模、数值模拟方法和微观驱替实验方法，表征了聚合物驱后油藏剩余油分布特征。聚合物驱后宏观剩余油平面上注采非主流线、主流线弱势区及注采井距较大的边部区域剩余油饱和度较高，纵向上正韵律顶部剩余油富集；微观剩余油以半束缚态为主，依据剩余油分布特征提出了非均相复合驱变流线井网加密调整技术思路。通过井网变流线加密调整，形成交错式行列井网模式，流线方向转变30°以上，流线转向率达80%，促使剩余油有效动用。数值模拟预测该技术可提高采收率10.96%，新增可采储量70.61×10⁴t，延长生命周期15 a，为聚合物驱后油藏大幅度提高采收率提供新的技术方法。

关键词: 聚合物驱后油藏, 数值模拟, 剩余油, 加密调整, 非均相复合驱, 提高采收率

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

中图分类号:

TE319

张连锋,张伊琳,郭欢欢,李洪生,李俊杰,梁丽梅,李文静,胡书奎. 近废弃油藏延长生命周期开发调整技术[J]. 油气藏评价与开发, 2024, 14(1): 124-132.

ZHANG Lianfeng,ZHANG Yilin,GUO Huanhuan,LI Hongsheng,LI Junjie,LIANG Limei,LI Wenjing,HU Shukui. Development adjustment technology of extending life cycle for nearly-abandoned reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 124-132.

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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