Producing Patterns and Improvement of Polymer Flooding Profile in Class ⅡB Reservoir, Daqing Oilfield

doi:10.7657/XJPG20240508

Abstract

Abstract:

The application of polymer flooding is expanding in Daqing oilfield, with the target transferring to poor-quality Class ⅡB reservoir. The existing polymers exhibit poor compatibility with the reservoir, the producing patterns of the profile remain unclear, and the effects of polymer flooding development vary greatly in different areas. To address these issues, through the analysis of field profile data statistics and laboratory experiments, the producing patterns and improvement methods for the profiles in Class ⅡB reservoir were investigated. In view of the producing status from water-injected layers, Lamadian area which is characterized by thick channel sandbodies and good reservoir properties exhibits the highest proportion of net pay producing, with the reservoir exploited frequently, multiple polymer breakthrough layers, and relatively high liquid absorption. The Sazhong and Sanan areas, with limited channel sandbodies and multiple thin sand layers with poor properties, show a low net pay producing proportion in the water flooding stage, after polymer flooding which is 12.5% and 15.4% higher than those in the water flooding stage, respectively. Additionally, the reservoirs with permeability ranging from 100 to 300 mD show a significant profile improvement. In view of the producing status of water-unswept layers, the strong vertical heterogeneity of Class ⅡB reservoir results in a high net pay unproducing proportion between layers. In this case, the profile should be improved by achieving balanced interlayer production. The alternating injection of salt-resistant polymer of high and low concentrations can delay the rise of water cut, enhance the liquid absorption in low-permeability layers, and significantly improve the recovery efficiency of polymer flooding. A pilot test on alternating injection of DS1200 salt-resistant polymer of high and low concentrations was conducted in A area of Beibei block in Lamadian, achieving satisfactory water-cut reduction and oil increment. This technology provides a guidance for improving the polymer flooding profiles of Class ⅡB reservoir in Daqing oilfield.

Key words: Daqing oilfield, Class ⅡB reservoir, polymer flooding, water injection profile, oil displacement experiment, salt-resistant polymer

CLC Number:

TE357.431

ZHOU Congcong, CAO Ruibo, SUN Hongguo, FAN Yu, GUO Songlin, LIANG Guoliang. Producing Patterns and Improvement of Polymer Flooding Profile in Class ⅡB Reservoir, Daqing Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(5): 567-573.

Figures/Tables 10

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油层类型	主要判定参数				辅助判定参数
油层类型	沉积相	砂体沉积类型	砂体钻遇率/%	单层碾平有效厚度/m	油层总钻遇率/ %	（表外钻遇率/ 油层总钻遇率/） %	有效渗透率/ mD
二类 A油层	泛滥平原	分流河道砂	≥30	≥1.0	≥80	≤20	≥0.3
	分流平原	厚层席状砂及分流河道砂	≥50		≥80	≤20	≥0.3
	内前缘	水下分流河道砂	≥20		≥80	≤30	≥0.1
		席状砂	≥30
		厚层席状砂及分流河道砂	≥40
二类 B油层	泛滥平原	分流河道砂	≥20	≥0.5	≥60	≤20	0.1~0.3
	分流平原	厚层席状砂及分流河道砂	≥40		≥60	≤20
	内前缘	席状砂及河分流道砂	≥60		≥80	≤30
	内前缘	薄层席状砂	≤25		≥80	≤30

地区	有效厚度动用比例			相对吸液量
地区	水驱	聚驱初期	聚驱平均	水驱	聚驱初期	聚驱平均
喇嘛甸	26.3	29.2	24.6	41.0	53.5	47.6
萨中	17.0	19.8	18.0	41.4	39.6	39.0
萨南	10.5	6.1	5.6	31.5	17.6	18.6

分布位置	地区	有效厚度未动用比例
分布位置	地区	水驱	聚驱第1年	聚驱第2年	聚驱第3年	聚驱第4年
层间	喇嘛甸	9.1	9.7	6.8	12.4	10.8
	萨中	23.3	28.4	32.6	20.0	21.9
	萨南	21.1	26.2	18.6	36.8	31.6
层内	喇嘛甸	14.8	12.1	14.1	16.9	9.7
	萨中	21.6	17.9	12.9	13.9	8.5
	萨南	14.4	10.3	10.6	3.5	1.9

聚合物及注入方式	质量浓度/ （mg·L^-1）	黏度/ （mPa·s）	有效渗透率/mD	含油饱和度/%	水驱采出程度/%	聚驱采出程度/%	采收率/ %
普通聚合物并联笼统注入	1 600	46.9	274	74.7	48.6	13.3	61.9
普通聚合物并联笼统注入	1 600	46.9	118	75.0	45.6	18.0	63.6
DS1200抗盐聚合物并联笼统注入	1 500	47.1	296	75.3	49.1	13.5	62.6
DS1200抗盐聚合物并联笼统注入	1 500	47.1	135	74.7	47.0	23.5	70.5
DS1200抗盐聚合物并联、高低质量浓度注入	1 800	62.2	285	74.5	46.8	14.4	61.2
DS1200抗盐聚合物并联、高低质量浓度注入	1 200	33.9	140	72.6	47.7	27.9	75.6

试验井区	注入井/口	采油井/口	砂岩厚度/m	有效厚度/m	渗透率/mD	试验方案
喇AS井区	8	15	15.8	11.3	459	DS1200抗盐聚合物笼统注入，质量浓度为1 700 mg/L
喇PS井区	6	10	18.1	12.7	467	普通聚合物高、低质量浓度交替注入，质量浓度分别为 2 200 mg/L和1 300 mg/L，交替周期为3个月