CO2驅油中的滲流力學理論最終報告

岳湘安

摘 要：該報告嚴格按照計劃進度完成了前三年的研究任務。完成調研報告工作進一步明確了研究思路與方法。建立了模擬實際油藏礦物膠結的儲層模型（可以模擬天然礦物膠結物）；改進了耐腐蝕的高壓CO2驅模擬裝置（耐CO2腐蝕和高壓，可模擬巖石所受的徑向及軸向壓力）；改進了高壓油水氣計量—回壓控制系統（實現高壓條件下氣體分區計量）；完成高壓條件下CO2指進模擬裝置的設計，拓展其可視化功能（可視化，減小實驗用氣量，降低了實驗操作的難度）；建立了CO2長期驅替實驗平臺（可真實反映儲層中CO2與巖石/水/原油的緩慢反應）。以吉林油田黑47井為研究對象，完成了儲層巖石的物性參數（通過實驗得到儲層礦物組成、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，并分析了其變化規律及特點（得到不同壓力、溫度下的CO2溶解性），確定了CO2驅替過程中儲層物性參數變化規律（得到不同驅替壓力和溫度下巖石孔隙度、滲透率的變化）。 綜合評價了現有的多相多組分LBM模型，并建立了細觀多相多組分LBM模型和邊界條件（得到能夠真實體現CO2混相機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，研究了單孔內兩相流動的滲流問題，研究了微孔中液態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）。進行了CO2/H2O/巖心相互作用對巖石的表面結構、化學元素、礦物組成的實驗研究，分析了在高溫高壓下CO2對儲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、巖石表面化學元素以及親水性的變化）；結合數值模擬，分析CO2驅過程中反應對儲層物性及開發效果的影響（得到考慮瀝青質沉淀對儲層物性及產能的影響）。 完成了部分CO2竄流的影響因素實驗，其中包括滲透率、裂縫、壓力等參數對CO2指進氣竄影響的實驗（得到不同滲透率、裂縫開度及壓力下，CO2的竄流程度）。

關鍵詞：CO2驅 滲流力學理論 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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