Li Shuai,Ding Yunhong,Liu Guangfeng,et al.Enhancing oil recovery by wettability alteration during fracturing in tight reservoirs[J].Journal of Shenzhen University Science and Engineering,2017,34(1):98-104.[doi:10.3724/SP.J.1249.2017.01098]





Enhancing oil recovery by wettability alteration during fracturing in tight reservoirs
1) 中国石油勘探开发研究院,北京 100083
2) 中国石油勘探开发研究院廊坊分院,河北廊坊 065007
3) 国家能源致密油气研发中心,北京 100083
4) 中国石油大学(北京)石油工程教育部重点实验室,北京102249
Li Shuai12 Ding Yunhong23 Liu Guangfeng4 Gu Daihong4 and Cai Bo2
1) Research Institute of Petroleum Exploration & Development, Beijing 100083, P.R.China
2) Research Institute of Petroleum Exploration & Development-Langfang, Langfang 65007, Hebei Province, P.R.China
3) National Energy Tight Oil R&D Center, Beijing 100083, P.R.China
4) EOM Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, P.R.China
tight oil formation volume fracturing wettability alteration surfactant imbibition enhanced oil recovery
TE 355
以致密油气体积改造注入的压裂液为切入口,将表面活性剂复配至压裂液中,探索在压裂过程中改变储层基质润湿性,提高采收率的方法.基于接触角和界面张力测量,在压裂液中分别添加阳离子表面活性剂、阴离子表面活性剂和非离子表面活性剂,在不同润湿状态下对致密岩心进行渗吸物模实验.通过改变润湿反转前后的相渗曲线和毛管压力曲线,对该过程进行模拟研究.结果显示:仅依靠压裂液不能引起润湿反转,渗吸采收率仅为4.95%.添加表面活性剂后润湿性发生变化,渗吸采收率有大幅提高,其中阳离子表面活性剂改变润湿性的能力要好于非离子表面活性剂和阴离子表面活性剂;考虑润湿反转的模型可对表面活性剂润湿反转过程进行较好描述,模拟结果与实验数据拟合较好;现场一平台井压裂液中加入润湿反转剂DL-15后,体积压裂形成复杂裂缝,产量比邻井提高2~4 t/d.建议体积改造形成复杂缝网的前提下,在压裂液中添加表面活性剂,延长焖井时间,依靠停泵后的压差驱替和渗吸置换作用,提高开井后产量.
In view of the comparison of contact angle and interfacial tension, we study the performance of the method of enhanced oil recovery (EOR) by altering the wettability of reservoir rock surfaces through adding different types of surfactant into the fracturing fluids during hydraulic fracturing. Firstly, the cationic surfactant, anionic surfactant and nonionic surfactant, respectively, were added into fracturing fluids. Afterwards, the imbibition experiments for tight cores after treated with different surfactants were performed. Lastly, a numerical simulation was carried to model the effects of wettability alteration by changing relative permeability curves and capillary curves. The main conclusions have been summarized as follows: (i) Only fracturing fluids cannot bring wettability alteration with a recovery as just of 4.95%. However, fracturing fluids added with surfactants can bring the changes of contact angle, and the recovery can be increased to be 21.29% (anionic surfactant), 15.84% (nonionic surfactant) and 9.91% (cationic surfactant). (ii) The simulation results with different relative permeability and capillary curves can achieve excellent agreement with the experimental data, hence this numerical simulation can be an effective method to describe wettability alteration in this study. (iii) As for field application, the oil production rate of a multi-stage fractured horizontal well with added surfactants (DL-15) into the fracturing fluids can have about 2~4 t/d more than that of other wells. (iv) The practices to add appropriate surfactants into the fracturing fluids during hydraulic fracturing and extend the shut-in period after fracturing are recommended in order to improve oil production performance.


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Foundation:National Science and Technoogy Major Progect (2016ZX05023)
Corresponding author:Professor Ding Yunhong. E-mail: dingyh@petrochina.com.cn
Citation:Li Shuai, Ding Yunhong, Liu Guangfeng, et al.Enhancing oil recovery by wettability alteration during fracturing in tight reservoirs[J]. Journal of Shenzhen University Science and Engineering, 2017, 34(1): 98-104.(in Chinese)
作者简介:李帅(1987—),男,中国石油勘探开发研究院博士研究生.研究方向:储层改造与油藏数值模拟.E-mail: ls_cupb@163.com
引文:李帅,丁云宏,刘广峰,等.致密储层体积改造润湿反转提高采收率的研究[J]. 深圳大学学报理工版,2017,34(1):98-104.
更新日期/Last Update: 2016-12-30