高温非均质油藏聚合物凝胶调驱实验研究

doi:10.3969/j.issn.1001-1803.2023.04.002

摘要/Abstract

摘要：

华北油田高温非均质油藏经过长期开采后，含水率高且非均质性进一步增强，而常规化学驱油措施控水增油效果较差。针对这一问题，通过室内体系筛选、物理模拟与理论分析相结合，研究了聚合物凝胶的抗高温性能、调剖效果以及控水增油能力。结果表明：筛选出的凝胶体系具有优异的抗高温性能与黏弹性模量，完全成胶后黏度最高可达4 371.2 mPa·s，经30天高温老化后，黏度保留率为90.5%，弹性模量和黏性模量分别为10.4和1.3 Pa。同时该体系具有较强的封堵能力，在一定渗透率级差范围内，该体系的剖面改善能力与控水增油能力随着渗透率级差的增大而增大。当渗透率级差从2.13增加到8.16时，调剖后剖面改善率从58%增加到92.8%；当渗透率级差从2.06增加到8.08时，调驱后采收率增幅从10.2%增加到19.5%。

关键词: 高温非均质油藏, 聚合物凝胶, 交联机理, 调驱能力, 采收率

Abstract:

After long-term exploitation of the high-temperature heterogeneous reservoirs in North China Oilfield, the water content becomes high and the heterogeneity is further enhanced, while conventional chemical flooding measures have poor effects in water control and enhancement of oil production. To solve this problem, the high-temperature resistance and the effects in profile control, water control and oil increase for polymer gels were studied through the combination of indoor screening, physical simulation, and theoretical analysis. The results showed that, the selected gel system had excellent high-temperature resistance and viscoelasticity, and the maximum viscosity was 4 371.2 mPa·s after complete gelation. After 30 days of high temperature aging, the viscosity retention rate was 90.5%, and the elastic modulus and viscous modulus were 10.4 and 1.3 Pa, respectively. The system had strong plugging ability. In a certain range of permeability contrast, the abilities of profile improvement, water control and enhancement of oil production of the system were increased with the increase of permeability contrast. When the permeability contrast was increased from 2.13 to 8.16, the profile improvement rate after profile control was increased from 58% to 92.8%; when the permeability contrast was increased from 2.06 to 8.08, the recovery rate after profile control and flooding was increased from 10.2% to 19.5%.

Key words: high-temperature heterogeneous reservoir, polymer gel, cross-linking mechanism, profile control and flooding, recovery rate

中图分类号:

TE357

廖建军, 李华斌, 邓金玭, 何刚, 刘思思, 张肖. 高温非均质油藏聚合物凝胶调驱实验研究[J]. 日用化学工业（中英文）, 2023, 53(4): 373-381.

Liao Jianjun, Li Huabin, Deng Jinpin, He Gang, Liu Sisi, Zhang Xiao. Experimental study on polymer gel profile control and flooding in high-temperature heterogeneous reservoirs[J]. China Surfactant Detergent & Cosmetics, 2023, 53(4): 373-381.

图/表 8

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Gel system	Polymer type	Polymer/（mg/L）	Cross-linking agent A/（mg/L）	Cross-linking agent B/（mg/L）
a	FP3640（1 900×10⁴ Dalton）	1 000	900	600
b		2 000	2 500	1 500
c		3 000	3 500	2 000
d	FP6030（2 500×10⁴ Dalton）	1 000	900	600
e		2 000	2 500	1 500
f		3 000	3 500	2 000

System	Viscosity retention rate/%	Dehydration rate/%
a	68.5	3.8
b	40.3	8.2
c	84.4	1.1
d	61.7	4.5
e	41.6	9.6
f	90.5	0.8

Permeability contrast	Core permeability/（×10^-3 μm²）	Core diversion rate/%			Profile improvement rate/%
Permeability contrast	Core permeability/（×10^-3 μm²）	Initial state	After 7 days	After 30 days	After 7 days	After 30 days
2.13	41.6	37.3	58.6	52.9	58	47
2.13	88.7	62.7	41.4	47.1	58	47
4.03	43.8	28.4	61.7	54.7	75.4	67.2
4.03	176.4	71.6	38.3	45.3	75.4	67.2
6.11	42.3	19.6	64.5	56.3	86.6	81.1
6.11	258.5	80.4	35.5	43.7	86.6	81.1
8.16	40.5	12.5	66.4	57.8	92.8	89.6
8.16	330.5	87.5	33.6	42.2	92.8	89.6