Hydraulic Fracturing Assisted Oil Displacement Productivity Prediction for Low-Permeability Reservoirs Considering the Combination of Soaking Imbibition and Displacement

doi:10.12422/j.issn.1006-396X.2026.04.007

Abstract

Abstract:

Through the combination of imbibition and displacement,the impact of the combined action of imbibition and displacement on reservoir pressure and fluid flow during the soaking process after reverse hydraulic fracturing assisted oil displacement in low-permeability reservoirs was explored.A semi-analytical mathematical model for productivity prediction of reverse hydraulic fracturing assisted oil displacement is established,considering interlayer heterogeneity.An analysis was conducted on the changes in the flow field before and after soaking.Parametric studies are conducted to reveal the effects of permeability ratio, total injection volume,injection rate and soaking time on the pressure swept range,saturation swept range and cumulative oil production of each layer after soaking.The research results indicate that soaking well after hydraulic fracturing assisted oil displacement can enhance the energy enhancement effect of reverse hydraulic fracturing assisted oil displacement,further expand the affected area,and thus utilize more geological reserves.To achieve efficient development through hydraulic fracturing assisted oil displacement,it is recommended to consider layered mining when the permeability ratio is greater than 25.Meanwhile,the soaking time should be controlled within 10~15 days,with a properly reduced injection rate and increased total injection volume.

Key words: Low-permeability reservoirs, Reverse hydraulic fracturing assisted oil displacement, Imbibition and displacement, Model, Productivity prediction

摘要：

通过“渗驱结合”的方式，探究了低渗储层反向压驱后焖井过程中渗吸和驱替共同作用对储层压力和流体流动产生的影响，建立了考虑层间非均质的反向压驱产能预测半解析解数学模型；分析了焖井前后流场变化，并探究了渗透率级差、注液量、注液速率和焖井时间等参数对焖井后各层压力波及范围、饱和度波及范围和累计产油量的影响。结果表明，压驱后焖井可以强化压驱增能效果，进一步扩大上述波及范围，从而动用更多的地质储量。为实现压驱高效开发，当渗透率级差大于25时，建议优先采用分层开采工艺，同时将焖井时间控制在10~15 d，并适当降低注液速率，增大注液量。

关键词: 低渗储层, 反向压驱, 渗吸和驱替, 模型, 产能预测

CLC Number:

TE348

Qi WU, Honghui QUAN, Chengfeng YIN, Yikun LIU. Hydraulic Fracturing Assisted Oil Displacement Productivity Prediction for Low-Permeability Reservoirs Considering the Combination of Soaking Imbibition and Displacement[J]. Journal of Petrochemical Universities, 2026, 39(4): 62-73.

吴奇, 全洪慧, 尹成峰, 刘义坤. 考虑焖井渗驱结合的低渗储层压驱产能预测[J]. 石油化工高等学校学报, 2026, 39(4): 62-73.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2026.04.007

https://journal.lnpu.edu.cn/syhg/EN/Y2026/V39/I4/62

Figures/Tables 17

Fig.1 Schematic diagram of physical model of hydraulic fracturing assisted oil displacement

Fig.2 Schematic diagram of pressure distribution during the processes of soaking well imbibition and displacement

Fig.3 Solution process of productivity prediction model

Table 1 Basic data table for W and Q wells in Block X

参数	W井数值					Q井数值
参数	低渗层	中渗层		高渗层		低渗层	高渗层
孔隙度/%	17.1	16.7		18.4		15.6	17.5
渗透率/mD	5.3	20.2		55.4		4.6	33.7
储层厚度/m	18.7	16.2		17.6		23.4	20.9
地层压力/MPa	12.5	12.6		12.8		16.5	16.7
埋藏深度/m	2 644.7	2 667.3		2 685.5		2 713.2	2 738.6
原油黏度/（mPa∙s）	0.7		0.7		0.7	0.7	0.7
水相黏度/（mPa∙s）	0.5		0.5		0.5	0.5	0.5
原油密度/（kg·m^-3）	680		680		680	680	680
参数	W井数值					Q井数值
参数	低渗层		中渗层		高渗层	低渗层	高渗层
水相密度/（kg·m^-3）	1 000		1 000		1 000	1 000	1 000
原油体积系数	1.6		1.6		1.6	1.6	1.6
水相体积系数	1.0		1.0		1.0	1.0	1.0
岩石泊松比	0.3		0.3		0.3	0.3	0.3
岩石剪切模量/GPa	10.8		10.8		10.8	10.8	10.8
综合压缩系数/MPa^-1	1×10^-5		1×10^-5		1×10^-5	1×10^-5	1×10^-5
地层破裂压力梯度 /（kg·m^-3）	1 130		1 130		1 130	1 130	1 130
注液量/m³	12 000		12 000		12 000	12 000	12 000
注液速率/（m³·min^-1）	6		6		6	6	6
焖井时间/d	10		10		10	10	10

Fig.4 Daily and cumulative production curves of W and Q wells over production time

Fig.5 Cloud map of pressure ripple range in medium permeability layer under different soaking times

Fig.6 Cloud map of saturation ripple range in medium permeability layer under different soaking times

Fig.7 Variation of pressure and saturation ripple range in medium permeability layer during the soaking stage over soaking time

Table 2 Permeability parameter settings for each layer at different permeability ratios

渗透率级差	渗透率/mD			平均渗透率/mD
渗透率级差	低渗层	中渗层	高渗层	平均渗透率/mD
1	30.00	30.00	30.00	30.00
25	2.31	30.00	57.69	30.00
50	1.18	30.00	58.82	30.00
100	0.59	30.00	59.41	30.00
200	0.30	30.00	59.70	30.00

Fig.8 Pressure and saturation ripple range in each layer after soaking under different permeability ratios

Fig.9 Variation of cumulative oil production in each layer with production time after soaking under different permeability ratios

Fig.10 Pressure and saturation ripple range in each layer after soaking under different cumulative injection volumes

Fig.11 Variation of cumulative oil production in each layer with production time after soaking under different cumulative injection volumes

Fig.12 Pressure and saturation ripple range in each layer after soaking under different injection rates

Fig.13 Variation of cumulative oil production in each layer with production time after soaking under different injection rates

Fig.14 Pressure and saturation ripple range in each layer after soaking under different soaking times

Fig.15 Variation of cumulative oil production in each layer with production time after soaking under different soaking times

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