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Research on Surfactant Flooding Technique for Heavy Oil

Author: YinHaiFeng
Tutor: ZhangGuiCai
School: China University of Petroleum
Course: Oil and Gas Field Development Project
Keywords: Emulsion stability Emulsification rate Recovery ratio Sweep efficiency Wash oil efficiency
CLC: TE357.4
Type: Master's thesis
Year: 2007
Downloads: 248
Quote: 2
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Abstract


Enhancing oil displacement efficiency and expand the sweep efficiency is the main way of the chemical method of heavy oil , emulsifying properties of the active agent is a key technology to achieve these two objectives . The emulsifying properties of the active agent contains the emulsion stability and emulsifying ease two aspects, research or blank on the degree of emulsification Difficult , however , emulsification is unclear for the EOR contribution . To solve this problem , two aspects of emulsion stability and emulsification rate , the oil-water emulsion mechanism reveals the contribution of emulsification EOR provide guidance for the screening of high - displacing agent . Emulsification degree of difficulty for the characterization of proposed the emulsification rate the concept , to design the quantitative determination of emulsification rate instrument and to optimize the operating parameters to study the factors of temperature , the concentration of the active agent , water quality , and the viscosity of the aqueous phase of the emulsion stability and emulsion rate the impact of polarity separation method of the heavy oil is divided into saturates , aromatics , resin and asphaltene , heavy crude components emulsification rate , resin and asphaltene can improve emulsification rate ; experimental method studied the relationship between the structure of surfactant molecules with the emulsifying rate , and found that the lipophilic chain length , EO- number emulsified rate exists a certain correspondence relationship , the lipophilic group branched help improve emulsification rate . Study found that the mutual relations of the dynamic interfacial tension , emulsion stability and emulsifying rate can improve emulsion stability and emulsification rate , but due to other factors , dynamic interfacial tension between the emulsion stability , emulsion stability and reduce the interfacial tension the emulsifying rate and there is no the regularity corresponding relationship . Dynamic interfacial tension of the initial value (1 ~ 2min) is a key factor affecting the rate of emulsification . The emulsification rate mainly depends on the hydrophilic-lipophilic balance of the adsorption film formation of the surface active agent in the oil-water interface , the closer to the balance , interfacial energy is lower , the greater the emulsification rate . Indoor flooding experiment found emulsification play a decisive role in the rate of oil displacement efficiency (ED) , emulsion stability sweep efficiency (EV) , due to lower emulsion stability will help improve spread coefficient ( EV ) .

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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 )
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