CO2驅(qū)油中的滲流力學(xué)理論最終報(bào)告

岳湘安

摘 要：該報(bào)告嚴(yán)格按照計(jì)劃進(jìn)度完成了前三年的研究任務(wù)。完成調(diào)研報(bào)告工作進(jìn)一步明確了研究思路與方法。建立了模擬實(shí)際油藏礦物膠結(jié)的儲(chǔ)層模型（可以模擬天然礦物膠結(jié)物）；改進(jìn)了耐腐蝕的高壓CO2驅(qū)模擬裝置（耐CO2腐蝕和高壓，可模擬巖石所受的徑向及軸向壓力）；改進(jìn)了高壓油水氣計(jì)量—回壓控制系統(tǒng)（實(shí)現(xiàn)高壓條件下氣體分區(qū)計(jì)量）；完成高壓條件下CO2指進(jìn)模擬裝置的設(shè)計(jì)，拓展其可視化功能（可視化，減小實(shí)驗(yàn)用氣量，降低了實(shí)驗(yàn)操作的難度）；建立了CO2長期驅(qū)替實(shí)驗(yàn)平臺(tái)（可真實(shí)反映儲(chǔ)層中CO2與巖石/水/原油的緩慢反應(yīng)）。以吉林油田黑47井為研究對象，完成了儲(chǔ)層巖石的物性參數(shù)（通過實(shí)驗(yàn)得到儲(chǔ)層礦物組成、表面元素、地層水組成等）、CO2在地層水與原油中的溶解度的檢測，并分析了其變化規(guī)律及特點(diǎn)（得到不同壓力、溫度下的CO2溶解性），確定了CO2驅(qū)替過程中儲(chǔ)層物性參數(shù)變化規(guī)律（得到不同驅(qū)替壓力和溫度下巖石孔隙度、滲透率的變化）。 綜合評價(jià)了現(xiàn)有的多相多組分LBM模型，并建立了細(xì)觀多相多組分LBM模型和邊界條件（得到能夠真實(shí)體現(xiàn)CO2混相機(jī)理并消除非物理虛假速度的微觀LBM模型）；利用建立的多相多組分LBM模型，研究了單孔內(nèi)兩相流動(dòng)的滲流問題，研究了微孔中液態(tài)CO2在不同潤濕性條件下對滲流的影響（得到不同粘度比、潤濕性下的微觀滲流特征）。進(jìn)行了CO2/H2O/巖心相互作用對巖石的表面結(jié)構(gòu)、化學(xué)元素、礦物組成的實(shí)驗(yàn)研究，分析了在高溫高壓下CO2對儲(chǔ)層表面潤濕性的影響（得到不同溫度壓力下，巖石表面元素組成的變化、地層水離子變化、巖石表面化學(xué)元素以及親水性的變化）；結(jié)合數(shù)值模擬，分析CO2驅(qū)過程中反應(yīng)對儲(chǔ)層物性及開發(fā)效果的影響（得到考慮瀝青質(zhì)沉淀對儲(chǔ)層物性及產(chǎn)能的影響）。 完成了部分CO2竄流的影響因素實(shí)驗(yàn)，其中包括滲透率、裂縫、壓力等參數(shù)對CO2指進(jìn)氣竄影響的實(shí)驗(yàn)（得到不同滲透率、裂縫開度及壓力下，CO2的竄流程度）。

關(guān)鍵詞：CO2驅(qū) 滲流力學(xué)理論 模型 模擬

The Research on Percolation Mechanics Theory in CO2 Flooding

Yue Xiangan

（China University of Petroleum-Beijing）

Abstract：The study task of the first three years was completed in strict accordance with the project schedule to. The idea and method of project research was further defined after literature research work. A reservoir simulation model which can truly simulate the actual reservoir mineral cementation was set up. The corrosion resistance of high pressure CO2 flooding simulator and high pressure oil and gas metering-back pressure control system were improved. The design of the simulator for simulating fingering under high pressure CO2 was completed， and its visual function was expanded， long-core displacement platform for CO2 flooding was established. The detection of physical parameters of reservoir rock， CO2 solubility in formation water and crude oil and its change rule and characteristics， determination of reservoir physical parameters change rule in CO2 flooding was completed by using black 47 Well in Jilin oilfield as the research object. The mesoscopic multiphase multicomponent LBM model and boundary conditions were established after comprehensive evaluation of the existing multiphase multicomponent LBM model， and it was used to study the seepage flow problem in single pore and the influence of liquid CO2 on seepage is studied under different wettability in microporous. The experimental study on the influence of CO2/H2O/core interaction on the surface of the rock structure， chemical element and mineral composition， analysis of the influence of CO2 on reservoir wettability under the high temperature and high pressure were completed. The influence of CO2 flooding on reservoir physical properties and exploitation effect were analyzed by combining with numerical simulation. Factors such as permeability， fracture， pressure of CO2 which affect the interporosity flow of CO2 were studied.

Key Words：CO2 flooding；Percolation mechanics theory；Model；Simulation

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