不同表面活性劑的弱堿三元驅(qū)驅(qū)油效果實(shí)驗(yàn)研究
發(fā)布時(shí)間：2018-07-25 10:05
【摘要】：目前,三元復(fù)合驅(qū)逐漸成為大慶油田的主導(dǎo)開采技術(shù)。三元復(fù)合驅(qū)包括強(qiáng)堿三元復(fù)合驅(qū)和弱堿三元復(fù)合驅(qū)。鑒于強(qiáng)堿三元驅(qū)造成的結(jié)垢現(xiàn)象嚴(yán)重阻礙了正常生產(chǎn),弱堿三元復(fù)合驅(qū)的研究越來(lái)越受到人們的重視。因此,研究弱堿三元體系性能及對(duì)采收率的影響,對(duì)油田進(jìn)一步開采具有重要的指導(dǎo)意義。本文選擇了三種表面活性劑,分別是石油磺酸鹽、可控變量烷基苯和脂肽,其中選擇石油磺酸鹽和脂肽搭配使用形成復(fù)配體系,我們借助儀器從研究三元復(fù)合體系的性能為起點(diǎn),研究了三元復(fù)合體系的流變性、粘彈性、界面張力及其影響因素,并通過測(cè)定阻力系數(shù)和殘余阻力系數(shù)分析了不同的表面活性劑造成了弱堿三元體系的流動(dòng)性差異;通過玻璃刻蝕可視化驅(qū)油實(shí)驗(yàn)研究了弱堿三元體系對(duì)殘余油的啟動(dòng)運(yùn)移機(jī)理;在均質(zhì)巖心巖心中分別進(jìn)行驅(qū)油實(shí)驗(yàn)來(lái)研究表活劑類型、組分濃度及主段塞大小對(duì)采收率的影響。實(shí)驗(yàn)結(jié)果表明:三元復(fù)合體系粘度與堿濃度成反比關(guān)系,同時(shí)堿的加入會(huì)降低其粘彈性;表面活性劑使三元復(fù)合體系粘度先下降然后上升,以表面活性劑的臨界膠束濃度為分界點(diǎn);溫度和存放時(shí)間對(duì)三元復(fù)合體系粘度存在不利影響,溫度越高粘性越差;存放時(shí)間越長(zhǎng),三元體系粘度損失越大,脂肽復(fù)配體系粘度穩(wěn)定性最差。三種表活劑的三元復(fù)合體系油水界面張力都能達(dá)到超低界面張力級(jí)別,在界面張力活性圖中,脂肽復(fù)配體系保持超低界面張力濃度范圍最廣。加入表面活性劑以后三元復(fù)合體系的阻力系數(shù)和殘余阻力系數(shù)都會(huì)發(fā)生不同程度的上升;通過微觀可視化模型發(fā)現(xiàn),乳化油滴作用是三元復(fù)合體系采出殘余油過程中最重要的方式;在室內(nèi)巖心驅(qū)油試驗(yàn)中發(fā)現(xiàn),脂肽復(fù)配體系驅(qū)油效果最好;提高石油磺酸鹽和弱堿濃度、增加主段塞注入量,能夠有效提高采收率。
[Abstract]:At present, ASP flooding has gradually become the dominant production technology in Daqing Oilfield. ASP flooding includes strong alkali ASP flooding and weak base ASP flooding. In view of the scaling phenomenon caused by strong alkali ternary flooding seriously hinders normal production, the study of weak alkali ternary flooding has been paid more and more attention. Therefore, it is important to study the properties of weak alkali ternary system and its influence on oil recovery. In this paper, three kinds of surfactants, petroleum sulfonate, controllable variable alkylbenzene and lipopeptide, were selected, among which petroleum sulfonate and lipopeptide were used together to form a compound system. We have studied the rheology, viscoelasticity, interfacial tension and its influencing factors of ternary composite system from the point of view of studying the properties of ternary composite system by means of instruments. By measuring resistance coefficient and residual resistance coefficient, the fluidity difference of weak base ternary system caused by different surfactants was analyzed, and the starting migration mechanism of weak base ternary system to residual oil was studied by glass etching visual flooding experiment. Oil displacement experiments were carried out in homogeneous cores to study the effects of the types of apparent active agents, the concentration of components and the size of the main slug on the oil recovery. The experimental results show that the viscosity of the ternary composite system is inversely proportional to the concentration of alkali, and the viscosity of the ternary composite system is reduced by the addition of alkali, while the viscosity of the ternary composite system decreases first and then increases with the addition of the base. With the critical micelle concentration of surfactant as the boundary point, the viscosity of the ternary system is adversely affected by temperature and storage time, the higher the temperature is, the worse the viscosity is, and the longer the storage time is, the greater the viscosity loss of the ternary system is. The viscosity stability of lipopeptide compound system was the worst. The oil-water interfacial tension of the three kinds of surfactants can reach the ultra-low interfacial tension level. In the interfacial tension activity diagram, the lipopeptide compound system maintains the widest range of ultra-low interfacial tension concentration. The resistance coefficient and residual resistance coefficient of the ternary composite system increase in varying degrees after the addition of surfactant, and it is found by the microscopic visualization model that the resistance coefficient and residual resistance coefficient of the ternary composite system will increase in varying degrees. The emulsified oil droplet is the most important way in the recovery of residual oil in the ternary composite system, and it is found in the laboratory core flooding test that the lipopeptide compound system has the best oil displacement effect, the concentration of petroleum sulfonate and weak base is increased, and the injection amount of the main slug is increased. It can effectively improve the recovery efficiency.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357.46
，
本文編號(hào)：2143463
[Abstract]:At present, ASP flooding has gradually become the dominant production technology in Daqing Oilfield. ASP flooding includes strong alkali ASP flooding and weak base ASP flooding. In view of the scaling phenomenon caused by strong alkali ternary flooding seriously hinders normal production, the study of weak alkali ternary flooding has been paid more and more attention. Therefore, it is important to study the properties of weak alkali ternary system and its influence on oil recovery. In this paper, three kinds of surfactants, petroleum sulfonate, controllable variable alkylbenzene and lipopeptide, were selected, among which petroleum sulfonate and lipopeptide were used together to form a compound system. We have studied the rheology, viscoelasticity, interfacial tension and its influencing factors of ternary composite system from the point of view of studying the properties of ternary composite system by means of instruments. By measuring resistance coefficient and residual resistance coefficient, the fluidity difference of weak base ternary system caused by different surfactants was analyzed, and the starting migration mechanism of weak base ternary system to residual oil was studied by glass etching visual flooding experiment. Oil displacement experiments were carried out in homogeneous cores to study the effects of the types of apparent active agents, the concentration of components and the size of the main slug on the oil recovery. The experimental results show that the viscosity of the ternary composite system is inversely proportional to the concentration of alkali, and the viscosity of the ternary composite system is reduced by the addition of alkali, while the viscosity of the ternary composite system decreases first and then increases with the addition of the base. With the critical micelle concentration of surfactant as the boundary point, the viscosity of the ternary system is adversely affected by temperature and storage time, the higher the temperature is, the worse the viscosity is, and the longer the storage time is, the greater the viscosity loss of the ternary system is. The viscosity stability of lipopeptide compound system was the worst. The oil-water interfacial tension of the three kinds of surfactants can reach the ultra-low interfacial tension level. In the interfacial tension activity diagram, the lipopeptide compound system maintains the widest range of ultra-low interfacial tension concentration. The resistance coefficient and residual resistance coefficient of the ternary composite system increase in varying degrees after the addition of surfactant, and it is found by the microscopic visualization model that the resistance coefficient and residual resistance coefficient of the ternary composite system will increase in varying degrees. The emulsified oil droplet is the most important way in the recovery of residual oil in the ternary composite system, and it is found in the laboratory core flooding test that the lipopeptide compound system has the best oil displacement effect, the concentration of petroleum sulfonate and weak base is increased, and the injection amount of the main slug is increased. It can effectively improve the recovery efficiency.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357.46
，
本文編號(hào)：2143463
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