致密油藏CO2吞吐驱油和封存注采参数敏感性分析——以鄂尔多斯盆地延长组长7段致密油藏典型储集层为例

doi:10.7657/XJPG20240206

摘要/Abstract

摘要：

致密油藏CO₂吞吐开发具有提高原油采收率和封存CO₂的双重效果。目前，对致密油藏CO₂吞吐驱油和封存研究中，鲜有学者将CO₂封存量相关参数作为评价指标。以鄂尔多斯盆地延长组长7段某致密油藏典型储集层为例，利用数值模拟技术分别选取吞吐时机、注气速度、注气时间、焖井时间、生产时间和吞吐轮次为注采参数，以换油率、CO₂滞留系数及驱油-封存协同综合系数为评价指标，采用单因素控制变量法和多因素正交试验设计，结合极差分析方法，分析了6个注采参数对3个评价指标的敏感性。结果表明：当注重CO₂驱油时，建议注气时间为30~60 d，注气速度为0.001 0~0.003 0 PV/d，吞吐时机小于0.5年；当注重CO₂封存时，建议生产时间为30~230 d，注气速度为0.007 5~0.010 0 PV/d，注气时间为145~180 d；当CO₂驱油和封存协同优化时，建议注气时间为30~65 d，吞吐时机为6个月前，焖井时间为10~20 d。

关键词: 致密油藏, 注采参数, CO₂吞吐, CO₂地质封存, 提高采收率, CO₂驱油, 协同优化, 正交试验

Abstract:

CO₂ huff-n-puff in tight oil reservoirs can enhance oil recovery and store CO₂. The existing researches on CO₂ huff-n-puff flooding and CO₂ storage in tight oil reservoirs rarely take parameters related to CO₂ storage capacity as evaluation indicators. Taking typical tight reservoirs in the seventh member of Yanchang formation (Chang 7 member) in the Ordos basin as an example, through numerical simulation, six injection-production parameters (huff-n-puff timing, injection rate, injection time, soaking time, production time and huff-n-puff cycle) and three evaluation indicators (oil exchange rate, CO₂ retention coefficient, and flooding-storage synthesis coefficient) were selected. Using single-factor control variable method and multi-factor orthogonal experimental design, together with range analysis method, the sensitivities of the six injection-production parameters to three evaluation indicators were analyzed. The results suggest that in the CO₂ flooding-dominant stage, it is recommended to set an injection time of 30-60 d, injection rate of 0.001 0-0.003 0 PV/d, and huff-n-puff timing of less than 0.5 a; in the CO₂ storage-dominant stage, it is recommended to set a production time of 30-230 d, injection rate of 0.007 5-0.010 0 PV/d, and injection time of 145-180 d; and in the synergistic optimization stage of CO₂ flooding and storage, it is recommended to set an injection time of 30-65 d, huff-n-puff timing of 6 months earlier, and soaking time of 10-20 d.

Key words: tight oil reservoir, injection-production parameter, CO₂ huff-n-puff, CO₂ storage, enhanced oil recovery, CO₂ flooding, synergistic optimization, orthogonal experiment

中图分类号:

TE348

丁帅伟, 张蒙, 李远铎, 许川, 周义鹏, 高群, 于红岩. 致密油藏CO₂吞吐驱油和封存注采参数敏感性分析——以鄂尔多斯盆地延长组长7段致密油藏典型储集层为例[J]. 新疆石油地质, 2024, 45(2): 181-188.

DING Shuaiwei, ZHANG Meng, LI Yuanduo, XU Chuan, ZHOU Yipeng, GAO Qun, YU Hongyan. Sensitivity Analysis of Injection-Production Parameters for CO₂ Huff-n-Puff Flooding and Storage in Tight Oil Reservoirs：A Case From Typical Tight Reservoirs of Chang 7 Member，Ordos Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 181-188.

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参考文献 36

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因素	换油率			CO₂滞留系数			驱油-封存协同综合系数
因素	评价指标值	极差	敏感性排序	评价指标值	极差	敏感性排序	评价指标值	极差	敏感性排序
吞吐时机	0.02~0.71	0.69	3	0.10~0.11	0.01	6	0.06~0.41	0.35	3
注气速度	0.02~2.58	2.56	1	0.01~0.15	0.14	2	0.09~1.30	1.21	1
注气时间	0.02~1.75	1.73	2	0.01~0.14	0.13	3	0.08~0.88	0.80	2
焖井时间	0.27~0.34	0.07	6	0.09~0.11	0.02	5	0.19~0.22	0.03	6
生产时间	0.01~0.62	0.61	4	0.08~0.30	0.22	1	0.10~0.35	0.25	4
吞吐轮次	0.01~0.30	0.29	5	0.09~0.12	0.03	4	0.06~0.21	0.15	5

方案编号	吞吐时机/年	注气速度/ （PV·d^-1）	注气时间/ d	焖井时间/ d	生产时间/ d	吞吐轮次	换油率	CO₂滞留系数	驱油-封存协同综合系数
CO₂_Hp1	0	0.001 0	30	10	30	1	0.01	0.01	0.01
CO₂_Hp2	0	0.003 0	65	20	230	3	2.65	0.03	1.34
CO₂_Hp3	0	0.005 0	105	35	365	5	0.71	0.10	0.41
CO₂_Hp4	0	0.007 5	145	50	500	7	0.20	0.12	0.16
CO₂_Hp5	0	0.010 0	180	60	700	10	0.08	0.11	0.10
CO₂_Hp6	0.5	0.001 0	65	35	500	10	4.31	0.01	2.16
CO₂_Hp7	0.5	0.003 0	105	50	700	1	2.63	0.01	1.32
CO₂_Hp8	0.5	0.005 0	145	60	30	3	1.59	0.39	0.99
CO₂_Hp9	0.5	0.007 5	180	10	230	5	0.01	0.17	0.09
CO₂_Hp10	0.5	0.010 0	30	20	365	7	0.94	0.06	0.50
CO₂_Hp11	1.0	0.001 0	105	60	230	7	1.44	0	0.72
CO₂_Hp12	1.0	0.003 0	145	10	365	10	0.34	0.08	0.21
CO₂_Hp13	1.0	0.005 0	180	20	500	1	0.01	0.14	0.07
CO₂_Hp14	1.0	0.007 5	30	35	700	3	2.16	0.01	1.08
CO₂_Hp15	1.0	0.010 0	65	50	30	5	2.61	0.32	1.46
CO₂_Hp16	1.5	0.001 0	145	20	700	5	2.21	0.01	1.11
CO₂_Hp17	1.5	0.003 0	180	35	30	7	0.01	0.28	0.14
CO₂_Hp18	1.5	0.005 0	30	50	230	10	0.67	0.04	0.36
CO₂_Hp19	1.5	0.007 5	65	60	365	1	0.01	0.13	0.07
CO₂_Hp20	1.5	0.010 0	105	10	500	3	0.04	0.13	0.09
CO₂_Hp21	2.0	0.001 0	180	50	365	3	0.01	0.03	0.02
CO₂_Hp22	2.0	0.003 0	30	60	500	5	1.99	0.01	1.00
CO₂_Hp23	2.0	0.005 0	65	10	700	7	0.64	0.05	0.34
CO₂_Hp24	2.0	0.007 5	105	20	30	10	0.01	0.25	0.13
CO₂_Hp25	2.0	0.010 0	145	35	230	1	0.01	0.28	0.14

因素	换油率			CO₂滞留系数			驱油-封存协同综合系数
因素	评价指标值	极差	敏感性排序	评价指标值	极差	敏感性排序	评价指标值	极差	敏感性排序
吞吐时机	0.526~1.892	1.366	3	0.072~0.124	0.052	4	0.328~1.011	0.683	2
注气速度	0.212~1.590	1.378	2	0.006~0.180	0.174	2	0.306~0.803	0.497	5
注气时间	0.017~1.519	1.502	1	0.022~0.174	0.152	3	0.085~1.075	0.990	1
焖井时间	0.204~1.436	1.232	4	0.086~0.134	0.048	5	0.148~0.788	0.640	3
生产时间	0.317~1.544	1.227	5	0.034~0.248	0.214	1	0.241~0.791	0.550	4
吞吐轮次	0.526~1.598	1.072	6	0.096~0.120	0.024	6	0.323~0.814	0.491	6

致密油藏CO₂吞吐驱油和封存注采参数敏感性分析——以鄂尔多斯盆地延长组长7段致密油藏典型储集层为例

Sensitivity Analysis of Injection-Production Parameters for CO₂ Huff-n-Puff Flooding and Storage in Tight Oil Reservoirs：A Case From Typical Tight Reservoirs of Chang 7 Member，Ordos Basin

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