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Study of Alternate Injection of Foam and AS System in EOR after Polymer Flooding

Author: WangMaoSheng
Tutor: WuWenXiang；WuXiaoLin
School: Daqing Petroleum Institute
Course: Oil and Gas Field Development Project
Keywords: Foam AS system Alternating injection Interfacial tension Enhanced oil recovery
CLC: TE357.46
Type: Master's thesis
Year: 2006
Downloads: 454
Quote: 3
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Abstract


Polymer flooding technology in China has been rapid development. For example, the Daqing Oilfield polymer drive industrialized promotion applications to obtain significant economic effect the EOR than water more than 10% , the current annual oil production has exceeded 000 million tons, oilfield sustainable development of major technological measures . Nevertheless, after polymer flooding reservoir still remaining about 40-50% of the crude oil was not taken up , and further improve recovery after polymer flooding is the research focus . Characteristics of the distribution of the remaining oil after polymer flooding , as well as laboratory experiments and field test results , further enhancing oil recovery after polymer flooding method microbial flooding , ASP flooding , microgel flooding, foam flooding . Based on experimental studies , the ASP flooding was 10% higher than the polymer flooding recovery . Foam flooding is developed on the basis of ASP flooding , generally higher than that of polymer flooding to improve oil recovery of about 20% . Microbial enhanced oil recovery technology can be microbial sources are divided into two categories of microbial enhanced oil recovery of exogenous and endogenous microbial enhanced oil recovery , physical simulation experimental results show that the enhanced oil recovery after polymer flooding around 5% . ASP flooding the foam drive better , but the cost is higher , promote the use is restricted . Microbial flooding due to more complex technology , process is not mature enough , being difficult to promote the use of . For the above, the AS system with foam injected alternately , physical modeling studies . AS system and foam system using the type of surfactant to enhance the function of each of the two systems . AS system , the active agent is mainly used for the formation of ultra-low interfacial tension , improve the oil displacement efficiency , while the active agent in the foam is mainly due to the formation of a the FCI value higher foam , used in the closure of hypertonic bore and the mobility control . Through the screening of the surfactant formulation optimization , as well as physical simulation experiments of flooding to start work , a comparative analysis of the experimental results , deepening the understanding of the nature of the enhanced oil recovery , the further development of enhanced oil recovery techniques useful Discussion .

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Production Engineering > Enhanced oil recovery and maintain reservoir pressure (secondary and tertiary oil recovery ) > Thermal, miscible , Chemical Oil Recovery (EOR EOR ) > Chemical flooding
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