非均相驱油体系与低中渗油藏适应性评价研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.003

摘要/Abstract

摘要：

王集油田王17块是国内首个在低中渗油藏开展的多级非均相调驱段塞聚合物驱提高采收率试验,目的是形成小断块、低中渗油藏化学驱配套技术,引领示范动用河南油田剩余的3 512×10⁴tⅠ类、Ⅱ类化学驱储量,油藏技术关键是驱剂与油藏的适应性、有效封堵极端耗水层、井网调整技术。从聚合物、黏弹颗粒驱油剂（PPG）与油藏相适应入手,重点研究了黏弹颗粒驱油剂的粒径分布,分析了影响黏弹颗粒吸水溶胀的因素,表征了抗盐性、抗剪切性、热稳定性,同时对形成的非均相体系颗粒数与浓度关系、注入性、驱油效率及分流率进行评价,优选的非均相驱油体系与低中渗油藏适应性较好,矿场应用取得了增油降水效果,为低中渗油藏提高采收率提供了技术支撑,具有借鉴意义。

关键词: 低中渗油藏, 聚合物驱, 黏弹颗粒, 非均相驱, 适应性

Abstract:

Wang-17 Block of Wangji Oilfield is the first zone in China to carry out polymer flooding EOR test with multi-stage heterogeneous profile control slug in oil reservoirs with low-medium permeability. The objective is to form the matching technology of chemical flooding in small fault block and low-medium permeability reservoirs, and to lead, demonstrate and use the remaining Class I and Class II chemical flooding reserves of 3 512×10⁴ t in Henan Oilfield. The keys of the technology are adaptability of flooding agent to reservoir, effective plugging of extreme water-consuming layers and well pattern adjustment. Therefore, starting with the adaptability of polymer and preformed particle gel（PPG） to reservoir, the grain size distribution of PPG and the factors affecting water absorption and swelling of viscoelastic particulate have been studied and the salt resistance, shear resistance and thermal stability have been characterized. Meanwhile, the relation between particle number and concentration, the possibility of injection, the oil displacement efficiency and the diversion rate of heterogeneous system have been evaluated. The results show that the optimized heterogeneous flooding system has better adaptability to low-medium permeability reservoirs. Field application has achieved the effect of increasing oil production and reducing water, which provides technical support and significant reference to EOR in the similar oil reservoirs.

Key words: low-medium permeability reservoir, polymer flooding, preformed particle gel, heterogeneous flooding, adaptability

中图分类号:

TE357

卢军,张卓,杨力生,郭琳琳,张小静. 非均相驱油体系与低中渗油藏适应性评价研究[J]. 油气藏评价与开发, 2020, 10(6): 17-23.

LU Jun,ZHANG Zhuo,YANG Lisheng,GUO Linlin,ZHANG Xiaojing. Adaptability of heterogeneous flooding system to low-medium permeability reservoirs[J]. Reservoir Evaluation and Development, 2020, 10(6): 17-23.

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聚合物/ （mg·L^-1）	HNPPG-1/ （mg·L^-1）	沉降临界时间/h	聚合物/ （mg·L^-1）	HNPPG-1/ （mg·L^-1）	沉降临界时间/h
800	400	>24	800	750	>24
1 000	500	>24	1 000	750	>24
1 200	600	>24	1 200	750	>24
1 500	750	>24	1 500	750	>24
3 000	1 500	>24	3 000	750	>24
5 000	2 500	>24	5 000	750	>24

样品	浓度/ （mg·L^-1）	粒径/ μm	颗粒重量/g	黏度/ （mPa·s）	时间/ d	30 d保留率/%
样品	浓度/ （mg·L^-1）	粒径/ μm	颗粒重量/g	黏度/ （mPa·s）	时间/ d	粒径	颗粒重量	黏度
HNPPG -1	5 000	94	16.6	202.7	0	70.82	78.91	143.57
		394	16.7	236.4	6
		368	14.8	254.2	10
		330	14.2	268.1	20
		279	13.1	291.6	30

浓度/ （mg·L^-1）	搅拌速度/ rpm	黏度/（mPa·s）		过网重量/g		剪切时间/ min	10 min保留率/%
		初始	剪切	60目	100目		黏度	颗粒
		初始	剪切	60目	100目		黏度	过60目	过100目
3 000	12 000	170.1	170.1	3.74	4.43	0	84.3	92.2	71.3
		168.6	161.3	3.12	4.39	3
		170.7	153.4	3.69	3.41	6
		168.9	141.4	3.45	3.16	10
	300	170.9	165.8	3.72	4.37	0	97.6	96.5	94.3
		169.2	165.2	3.68	4.31	3
		170.2	165.6	3.64	4.26	6
		170.1	166.1	3.59	4.12	10

聚合物（P）∶PPG	聚合物/ （mg·L^-1）	PPG/ （mg·L^-1）	体系黏度/ （mPa·s）	弹性模量/mPa
5∶1	1 500	300	70.4	298
4∶1	1 500	375	72.3	376
3∶1	1 500	500	75.2	462
2∶1	1 500	750	110.0	591
3∶2	1 500	1 000	132.8	771
1∶1	1 500	1 500	184.3	1 090

注入体系配方	注入压力/MPa	渗透率/ μm²	孔隙度/ %	注入端阻力系数	残余阻力系数	封堵效率/ %
1 200 mg/L（P）+ 800 mg/L（HNPPG-1）	3.5	0.395	26.90	185.27	14.86	85.1
1 200 mg/L（P）+ 800 mg/L（HNPPG-1）	6.0	0.309	12.51	290.50	12.40	91.9
1 200 mg/L（P）+ 800 mg/L（HNPPG-1）	17.0	0.190	20.15	365.33	64.53	99.8
1 000 mg/L（P）+ 200 mg/L（HNPPG-1）	7.5	0.198	20.91	203.57	40.77	97.6