本文選題：壓裂　切入點：油包水乳狀液　出處：《東北石油大學(xué)》2017年碩士論文

【摘要】：壓裂改造作為低滲透油藏最有效的開發(fā)方式,能夠保證其應(yīng)有的采油速度,進(jìn)而提高采收率,推進(jìn)低滲儲量的動用。針對低滲油藏儲層物性差、滲透率低、水敏性強等特點,本文合成了油包水型乳化壓裂液體系,改善了常規(guī)壓裂液對地層損害嚴(yán)重、成本高的缺陷,使其在低滲、強水敏儲層中有較好的適用性。本文以五氧化二磷、磷酸三乙酯、有機醇為原料合成了稠化劑烷基磷酸酯,利用雙指示劑滴定法對其產(chǎn)率進(jìn)行了測定,通過正交試驗法分析了反應(yīng)時間、反應(yīng)溫度、反應(yīng)物投料比對產(chǎn)率的影響,結(jié)合基液配伍性實驗,確定了稠化劑的最佳合成條件為:(1)聚合時間5h、聚合溫度85℃、P2O5與C6H15O4P摩爾投料比1:1.5,(2)酯化時間5.5h、酯化溫度100℃、單烷基磷酸酯中間體與混合醇摩爾投料比為1:1.4,混合醇組合為正丁醇、正辛醇、十六醇,三者摩爾比為1:1:1;對稠化劑DC-1進(jìn)行了紅外光譜表征,結(jié)果顯示合成物中含有磷酸酯構(gòu)架,為預(yù)期產(chǎn)物。確定了復(fù)合交聯(lián)劑DZ-1的配方為:25wt%硫酸鐵+8%wt乙二醇+12wt%檸檬酸三鈉+水。通過實驗分析了乳化劑種類及加量、油水體積比、反應(yīng)溫度對油包水乳化壓裂液穩(wěn)定性的影響,確定了復(fù)配乳化劑的配方為:90%Span80+5%Tween80+5%月桂醇,得到最佳穩(wěn)定條件為:復(fù)配乳化劑加量2%、油水體積比6:4、溫度70℃;采用上述配方合成了油包水乳化壓裂液體系,結(jié)果表明該體系成膠性能較好,在溫度25℃、剪切速率170s-1條件下,表觀黏度可達(dá)329.8m Pa.s。對油包水乳化壓裂液體系進(jìn)行了性能評價,確定了最佳交聯(lián)比與稠化劑使用濃度分別為1:1.25與1.5%;該配方下交聯(lián)后的油包水乳化壓裂液體系在70℃,170s-1下剪切45min以上后,壓裂液黏度仍保持在155m Pa.s左右,具有較好的耐溫耐剪切性能,適用于70℃以下的儲層壓裂改造;應(yīng)變掃描結(jié)果顯示,該壓裂液體系彈性模量1.0Pa,耗能模量0.3Pa,呈膠體特性;經(jīng)實驗測定,該壓裂液體系具有較好的懸砂性能,石英砂在其沉降速率為0.0025mm/s,且當(dāng)破膠劑加量為2%,破乳劑加量為0.8%時,破膠破乳后壓裂液的黏度為4.74m Pa.s,符合壓裂液通用標(biāo)準(zhǔn)中的返排黏度要求。
[Abstract]:As the most effective development method of low permeability reservoir, fracturing can guarantee the oil recovery rate, and then improve the recovery factor, promote the production of low permeability reserves, aiming at the poor physical property, low permeability and strong water sensitivity of low permeability reservoir, etc. In this paper, the oil-in-water emulsion fracturing fluid system is synthesized, which improves the defects of the conventional fracturing fluid which has serious damage to formation and high cost, and makes it suitable for low permeability and strong water sensitive reservoir. The thickener alkyl phosphate was synthesized from organic alcohol and its yield was determined by double indicator titration. The effects of reaction time, reaction temperature and feed ratio of reactants on the yield were analyzed by orthogonal test. In combination with the compatibility experiment of base solution, the optimum conditions for the synthesis of thickener were determined as follows: polymerization time 5 h, polymerization temperature 85 鈩，

本文編號：1659231