【摘要】：針對壓裂液返排液液量大、處理難度大、處理費(fèi)用高及污染環(huán)境的問題,本文在考察粘彈性表面活性劑(VES)清潔壓裂液破膠液基本性質(zhì)的基礎(chǔ)上,構(gòu)建了一種可用于驅(qū)油的VES清潔壓裂液破膠液驅(qū)油體系,實(shí)現(xiàn)了對清潔壓裂液返排液的重復(fù)再利用。室內(nèi)構(gòu)建了基于VES清潔壓裂液破膠液的驅(qū)油體系,體系配方為:0.1~0.4wt%破膠液+0.004~0.02wt%AOS。該體系在溫度為61℃、礦化度為8.1×104mg/L條件下與安塞長6層脫水原油之間的界面張力為7.0×10-4mN/m,老化30天后界面張力仍能保持在10-3mN/m數(shù)量級,能夠達(dá)到三次采油的標(biāo)準(zhǔn)。對構(gòu)建的VES清潔壓裂液破膠液驅(qū)油體系性能進(jìn)行了系統(tǒng)評價(jià),研究結(jié)果表明:該體系適用溫度范圍為50℃~90℃,適用礦化度范圍為3×104mg/L~21×104mg/L,在溫度為61℃、礦化度為8.1×104mg/L條件下該體系潤濕性能優(yōu)良,乳化性能較好,靜砂表面的靜態(tài)吸附量為30.25mg/g,動(dòng)態(tài)飽和吸附量為靜態(tài)的1/3,且水驅(qū)后動(dòng)態(tài)滯留量僅相當(dāng)于動(dòng)態(tài)飽和吸附量的1/4~1/3。通過室內(nèi)物理模擬實(shí)驗(yàn)顯示,最優(yōu)注入方案條件下實(shí)現(xiàn)采收率增值為12.5%,表明該體系在水驅(qū)后能夠進(jìn)一步提高采收率。采用巖心CT掃描、SEM電鏡及微觀仿真模型研究水驅(qū)后殘余油分布、殘余油的存在形式以及注入表面活性劑后殘余油的啟動(dòng)和運(yùn)移方式,直觀地探究了表面活性劑的驅(qū)油機(jī)理。
[Abstract]:In view of the problems of large amount of fluid flowing back from fracturing fluid, great difficulty in treatment, high cost of treatment and pollution of environment, the basic properties of viscoelastic surfactant (VES) cleaning fracturing fluid are investigated in this paper. An oil displacement system of VES clean fracturing fluid was constructed, which can be used to drive oil. The reutilization of clean fracturing fluid was realized. An oil displacement system based on VES clean fracturing fluid was constructed in laboratory. The formula of the system is: 0.1 ~ 0.4wt% gel-breaking fluid 0.004 ~ 0.02wt AOS. The interfacial tension between the system and Ansai 6 layers of dehydrated crude oil is 7.0 脳 10 ~ (-4) mn / m under the condition of temperature 61 鈩，

本文編號：2423349