[1]苏玉亮,韩秀虹,王文东,等.致密油体积压裂耦合渗吸产能预测模型[J].深圳大学学报理工版,2018,35(4):345-352.[doi:10.3724/SP.J.1249.2018.04345]
 SU Yuliang,HAN Xiuhong,WANG Wendong,et al.A semi-analytical model for multi-stage fractured horizontal well coupled with imbibition in tight oil reservoir[J].Journal of Shenzhen University Science and Engineering,2018,35(4):345-352.[doi:10.3724/SP.J.1249.2018.04345]
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致密油体积压裂耦合渗吸产能预测模型()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第35卷
期数:
2018年第4期
页码:
345-352
栏目:
环境与能源
出版日期:
2018-07-10

文章信息/Info

Title:
A semi-analytical model for multi-stage fractured horizontal well coupled with imbibition in tight oil reservoir
作者:
苏玉亮1韩秀虹1王文东1盛广龙1杨正明2何英2王志远2
1)中国石油大学(华东)石油工程学院,山东青岛 266580;2)中国石油勘探开发研究院廊坊分院,山东廊坊 065007
Author(s):
SU Yuliang1 HAN Xiuhong1 WANG Wendong1 SHENG Guanglong1 YANG Zhengming2 HE Ying2 and WANG Zhiyuan2
1)School of Petroleum Engineering, China University of Petroleum (East), Qingdao 266580, Shandong Province, P.R.China 2) PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, Shandong Province, P.R.China
关键词:
致密油渗吸压裂水平井产能计算窜流复合模型
Keywords:
tight oil imbibition fractured horizontal well productivity calculation cross flow composite model
分类号:
TE 33+1
DOI:
10.3724/SP.J.1249.2018.04345
文献标志码:
A
摘要:
致密/页岩油储层在进行大型水力压裂时,注入压裂液返排率平均仅为10%,压裂液滞留在地层中通过渗吸作用置换储层中的原油,从而达到提高单井产能的目的.为了表征压裂液滞留与渗吸采油在压裂水平井中的复杂作用,从渗吸机理出发,建立了水平井体积压裂耦合渗吸产能预测模型,模型中通过引入基质与裂缝间的毛管力来修正窜流项,表征渗吸作用,同时考虑启动压力梯度来描述基质的低渗特性.通过Laplace变换和Stehfest数值反演方法对模型进行求解并完成模型验证,研究了致密油压裂过程中压裂液滞留量、储层岩石润湿性以及启动压力梯度对体积压裂水平井产能的影响机制.研究结果表明,较高的压裂液滞留量和较小的启动压力梯度有利于提高生产井产能;油湿性储层应减弱毛管力作用,而水湿性储层应增强渗吸的作用,以提高油井生产能力.致密油压裂水平井渗吸产能计算模型为渗吸采油以及致密储层的开发提供了理论依据.
Abstract:
In the procedure of large scale hydraulic fracturing in tight and shale oil formation, the back-flow efficiency is only up to 10%. Oil was replaced by fracturing fluid retained in formation via imbibition process, leading to the increase of single well productivity. In order to research the effect of fracturing fluid retention and imbibition on fractured horizontal well in tight reservoir, a mathematical model considering imbibition is developed on the basis of Darcy’s law, in which imbibition is represented by capillary pressure between matrix and fracture and the low permeability property is characterized by threshold pressure gradient. A semi-analytical solution is given by Laplace transform and Stehfest numerical inversion. The results of productivity model is validated by numerical solution calculated by Eclipse software. Influence rules and patterns of fracturing fluid retention, formation wettability and threshold pressure gradient on fractured horizontal well in tight oil is analyzed by using the productivity model. Results shows that higher fracturing fluid retention and lower threshold pressure gradient lead to high production. In order to increase the production, capillary pressure should be weaken in oil-wet reservoir and be strengthen in water-wet formation. The production calculation model for fractured horizontal well in tight oil provides a theoretical basis for imbibition oil recovery and the development of tight oil formation.

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更新日期/Last Update: 2018-06-20