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20170606学术报告-What Are We Doing about EOR in Shale and Tight Formations

报告题目:“What Are We Doing about EOR in Shale and Tight Formations”

报 告 人:盛家平 教授

时    间:2017年06月06日(周二)下午15:30-17:30

地    点:国家重点实验室A403

报告人单位:美国德克萨斯州理工大学

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讲座内容:The most commonly used technique to produce shale oil and gas condensate is through primary depletion using horizontal wells with multiple transverse fractures. Utilizing such techniques, the oil recovery factor is only a few percent. There is a big prize to be claimed, in terms of enhanced oil recovery (EOR) and economic returns, if this can be raised significantly. Here I will discuss the main geological factors particularly ultralow-permeability of these materials that have to be overcome to reach this prize, and discuss recent EOR research that indicates that gas injection processes can significantly increase recovery factors from fine grained sedimentary rocks in the laboratory environment.

Because of ultra-low permeability, gas injection is the first choice to maximize recovery as tight rocks are one to two orders of magnitude more permeable to gas than a liquid. With this in mind gas is more likely to impact a greater volume of the pore space. There are two implementations of the gas injection technique: continuous injection and huff-n-puff. The continuous injection mode has two problems: (1) gas breaks through if fractures exist between an injector and a producer, (2) gas cannot reach a producer because of ultra-low matrix permeability. The huff-n-puff mode has the advantage in these issues. Years of our research work both experimental and simulation show that the huff-n-puff is a preferred method.

If water is injected, how does water reacts with shale rock? Will water-rock interactions enhance microfracture generation or reduce rock permeability? Our results show that the interactions behave differently at different conditions, and the water chemicals significantly play their roles. Those chemicals we studied include salinity, acids, alkalis and surfactants. People are more interested in surfactants. What are the EOR mechanisms for surfactants, wettability alteration or reduced interfacial tension? How does water injection perform compared with gas injection? For gas injection, air is free. Can we inject air to enhance oil recovery in shale and tight formations? We will discuss our results for those questions. More importantly, we will discuss the future efforts and possible EOR solutions

盛家平,教授 1983年毕业于华东石油学院,获得加拿大阿尔伯特大学博士。拥有四项美国专利,发表100 多篇论文,著书两本:(1) Chemical Enhanced Oil Recovery, (2) EOR Field Case Studies。现在美国德克萨斯州理工大学任教。在大学任教之前,已在几个石油大公司工作二十多年 (法国道达尔,美国贝壳休斯,荷兰/英国的壳牌,科威特国家石油公司,中石油堪探院)。已在这些领域结累了丰富的经验:页岩油气研发,提高采收率,油藏数值模拟,试井压力分析。曾两次获SPE 地区技术奖(美国西南地区) (2013,2015),获得德州理工大学工程院Whitacre 工程研究奖,被学生选为最有影响的教授 (2015,2017),获美国富布莱特专家奖帮助越南石油大学建设石油工程专业(2013) , (美国)石油工程师协会期刊编委“精英组(A Peer Apart)”成员 (SPE) (2009),曾任 (美国)工程师期刊 (SPEREE) 副主编 (2005-2008), ELSEVIER石油科技期刊副主编(2008—2011),科威特石油协会秘书长(1998—1999)。

 

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                                      石油与天然气工程学院 西南石油大学科研处

                                      2017年6月5日