【摘要】：針對壓裂液返排液液量大、處理難度大、處理費用高及污染環(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的基礎上,構建了一種可用于驅油的VES清潔壓裂液破膠液驅油體系,實現(xiàn)了對清潔壓裂液返排液的重復再利用。室內構建了基于VES清潔壓裂液破膠液的驅油體系,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數量級,能夠達到三次采油的標準。對構建的VES清潔壓裂液破膠液驅油體系性能進行了系統(tǒng)評價,研究結果表明: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,動態(tài)飽和吸附量為靜態(tài)的1/3,且水驅后動態(tài)滯留量僅相當于動態(tài)飽和吸附量的1/4~1/3。通過室內物理模擬實驗顯示,最優(yōu)注入方案條件下實現(xiàn)采收率增值為12.5%,表明該體系在水驅后能夠進一步提高采收率。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和運移方式,直觀地探究了表面活性劑的驅油機理。
[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