本文關(guān)鍵詞： 膠質(zhì) 瀝青質(zhì) 二氧化碳 高壓顯微固相沉淀實(shí)驗(yàn) 可視化 提高采收率　出處：《特種油氣藏》2017年02期 　論文類型：期刊論文

【摘要】：為明確CO_2驅(qū)油過程中膠質(zhì)瀝青質(zhì)沉淀原因,從原油中分離出膠質(zhì)和瀝青質(zhì)分別與正庚烷和甲苯配置成膠質(zhì)模擬液和瀝青質(zhì)模擬液,并用2種模擬液分別與CO_2組成不同摩爾分?jǐn)?shù)的二元體系,通過高壓顯微固相沉淀實(shí)驗(yàn),觀察2個(gè)體系中固相顆粒的變化規(guī)律,探究CO_2對(duì)膠質(zhì)瀝青質(zhì)的作用機(jī)理。實(shí)驗(yàn)表明:膠質(zhì)模擬液-CO_2體系中CO_2的摩爾分?jǐn)?shù)達(dá)到12.50%時(shí),膠質(zhì)顆粒發(fā)生沉淀,隨CO_2含量增加沉淀半徑增大;當(dāng)CO_2摩爾分?jǐn)?shù)增至35.00%時(shí),膠質(zhì)沉淀開始沉積,發(fā)生聚集;當(dāng)CO_2的摩爾分?jǐn)?shù)大于50.00%時(shí),降低體系壓力至泡點(diǎn)壓力以下,CO_2先從正庚烷液相中析出,后從液狀膠質(zhì)聚集體中析出。瀝青質(zhì)模擬液-CO_2體系在泡點(diǎn)壓力處顆粒半徑最大;隨CO_2含量增加,瀝青質(zhì)顆粒沉淀半徑增大;當(dāng)CO_2摩爾分?jǐn)?shù)增至60.00%時(shí),瀝青質(zhì)顆粒發(fā)生聚集形成沉積。該項(xiàng)研究對(duì)于分析CO_2驅(qū)過程中膠質(zhì)瀝青質(zhì)對(duì)沉淀的貢獻(xiàn)情況、沉淀生成的主要原因以及如何減小沉淀對(duì)生產(chǎn)造成的傷害具有重要指導(dǎo)作用,對(duì)于增強(qiáng)原油的運(yùn)移能力進(jìn)而提高儲(chǔ)層原油采收率具有理論指導(dǎo)意義。
[Abstract]:In order to clarify the cause of glial asphaltene precipitation during CO_2 flooding, colloid and asphaltene were separated from crude oil with n-heptane and toluene to form colloidal and asphaltene simulant, respectively. Two kinds of simulated solution and CO_2 were used to form binary system with different mole fraction, and the changes of solid particles in the two systems were observed by high-pressure micro-solid precipitation experiment. The experimental results show that the colloidal particles precipitate when the mole fraction of CO_2 reaches 12.50%. The precipitation radius increases with the increase of CO_2 content. When the molar fraction of CO_2 increased to 35.00, the colloid precipitation began to deposit and aggregation occurred. When the molar fraction of CO_2 is greater than 50.00g, the lower the pressure of the system to the bubble point pressure, the COS-2 precipitates from the n-heptane liquid phase. Then precipitated from the liquid colloid aggregates. The asphaltene simulative liquid-COSP _ 2 system has the largest particle radius at the bubble point pressure. With the increase of CO_2 content, the precipitation radius of asphaltene particles increases. When the mole fraction of CO_2 is increased to 60.00g, the asphaltene particles aggregate and form deposition. This study contributes to the analysis of the contribution of glial asphaltene to precipitation in the process of CO_2 flooding. The main reasons of precipitation formation and how to reduce the damage caused by precipitation have important guiding significance for enhancing the migration capacity of crude oil and improving oil recovery of reservoir oil.
【作者單位】： 中國(guó)科學(xué)院滲流流體力學(xué)研究所;中國(guó)石油勘探開發(fā)研究院;提高石油采收率國(guó)家重點(diǎn)實(shí)驗(yàn)室;國(guó)家能源二氧化碳驅(qū)油與埋存技術(shù)研發(fā)(實(shí)驗(yàn))中心;中國(guó)石油長(zhǎng)慶油田分公司;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃“973”項(xiàng)目“孔隙介質(zhì)中相態(tài)實(shí)驗(yàn)與理論研究”(2011CB707304) 國(guó)家油氣重大專項(xiàng)“CO_2驅(qū)油與埋存油藏工程技術(shù)及應(yīng)用”(2016ZX05016-001) 中國(guó)石油天然氣股份有限公司專項(xiàng)“長(zhǎng)慶油田低滲透油藏CO_2驅(qū)油與埋存關(guān)鍵技術(shù)研究應(yīng)用”(2014E3606)
【分類號(hào)】：TE357.7
【正文快照】： 5.中國(guó)石油長(zhǎng)慶油田分公司,陜西靖邊718500)0引言CO2驅(qū)油過程中會(huì)伴隨膠質(zhì)瀝青質(zhì)產(chǎn)生沉淀,在地層、井筒附近和生產(chǎn)管線沉積,影響驅(qū)油效率和生產(chǎn)過程[1-6]。已有研究發(fā)現(xiàn)原油中膠質(zhì)對(duì)瀝青質(zhì)起膠溶分散作用[7-10],以維持石油的膠質(zhì)穩(wěn)定性,而CO2驅(qū)油過程打破了原油中各組分的平衡

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