【摘要】：大慶油田水井注入壓力統(tǒng)計資料表現(xiàn),前期三元復合體系注入壓力接近儲層巖石破裂壓力,這表明后續(xù)進一步提高采收率措施預留壓力上升空間很小。因此,在進行進一步提高采收率措施增油效果評價時,必須考慮實際可能的壓力升高幅度(聚合物驅后進一步提高采收率方法及其技術經(jīng)濟效果評價王亮盧祥國)。否則,就會出現(xiàn)室內通過大幅度提高注入壓力實現(xiàn)了擴大波及體積目的、而礦場卻難以達到壓力升幅要求甚至注入困難的尷尬局面。本文開展強堿三元復合驅后多元注入體系提高采收率室內實驗研究,通過室內實驗研究,篩選了強堿三元復合驅后提高采收率的多元注入體系,即高濃聚合物溶液、無堿二元體系、弱堿三元體系、聚表劑體系、陽離子凝膠體系、微球體系、反向調剖體系,進行性能評價實驗研究和物理模擬實驗,以采收率、含水率和注入壓力為評價指標,以大慶杏樹崗油田為實驗平臺,在恒速和恒壓條件下開展了強堿三元復合驅后進一步提高采收率方法增油效果實驗研究。結果表明,在恒速實驗條件下,強堿三元復合驅后采用高濃度聚合物溶液、無堿二元復合體系、弱堿三元復合體系、“聚合物凝膠+弱堿三元復合體系”和“聚合物凝膠+無堿二元復合體系”驅都可以進一步提高采收率,其中“聚合物凝膠+無堿二元復合體系”驅技術經(jīng)濟效果較好。在恒壓實驗條件下,高濃聚合物采液速度較低,生產(chǎn)持續(xù)時間較長,相應操作費較高,技術經(jīng)濟效果變差。與其它恒壓驅油方式相比較,“聚合物凝膠+無堿二元復合體系”驅采收率增幅較大,采液速度較高,技術經(jīng)濟效果較好。在強堿三元復合體系和后續(xù)進一步提高采收率驅油劑注入過程中,由于巖心的非均質性,注入初期和中期高滲透層吸液量減小、分流率降低,中低滲透層吸液量增加、分流率升高。但當注入進入中后期時,中低滲透層吸液量減少、分流率降低,高滲透層吸液量增加、分流率升高,出現(xiàn)“剖面反轉”現(xiàn)象,進而對化學驅增油效果造成不利影響。
[Abstract]:The statistical data of injection pressure in Daqing Oilfield indicate that the injection pressure of the ternary composite system is close to the rock fracture pressure in the early stage, which indicates that there is little room for further increase in the reserve pressure of recovery measures. Therefore, it is necessary to consider the possible range of pressure rise (further improving oil recovery after polymer flooding and evaluating Wang Liang Lu Xiangguo's technical and economic effects) when evaluating the effect of increasing oil production by further improving oil recovery measures. Otherwise, there will be an awkward situation in the room where the volume of sweep is achieved by raising the injection pressure by a large margin, but it is difficult for the mine to meet the requirement of pressure increase or even to inject difficulties. In this paper, laboratory experiments on the enhancement of oil recovery by multicomponent injection system after strong alkali ternary flooding were carried out. Through laboratory experiments, the high concentration polymer solution was selected as the multi-element injection system for enhancing recovery after strong alkali ternary flooding. Alkali-free binary system, weak alkali ternary system, polymer system, cationic gel system, microsphere system, reverse profile control system, performance evaluation experiments and physical simulation experiments were carried out. Oil recovery, water content and injection pressure were taken as the evaluation indexes. On the platform of Daqing Xingshugang Oilfield, an experimental study was carried out to further improve the oil recovery efficiency after the strong alkali ASP flooding under constant speed and constant pressure. The results show that, under the constant rate experimental conditions, high concentration polymer solution, alkali-free binary composite system and weak alkali ternary composite system are used after strong alkali ternary flooding. The flooding of "polymer gel weak alkali ternary composite system" and "polymer gel alkali-free binary composite system" can further improve oil recovery, among which "polymer gel alkali free binary composite system" has better economic effect. Under the condition of constant pressure experiment, the liquid recovery rate of high concentration polymer is lower, the production duration is longer, the corresponding operation cost is higher, and the technical and economic effect becomes worse. Compared with other constant pressure flooding methods, polymer gel alkali-free binary composite system has higher oil recovery rate, higher liquid recovery rate and better technical and economic effect. In the strong alkali ternary composite system and the further improvement of oil recovery flooding agent injection process, due to the heterogeneity of the core, the amount of liquid absorption in the high permeability layer at the initial and middle stages of injection decreases, the distribution rate decreases, and the liquid absorption capacity of the medium and low permeability layer increases. The shunt rate increased. However, when the injection enters the middle and late stage, the amount of liquid absorption in the middle and low permeability layer decreases, the distribution rate decreases, the liquid absorption rate of the high permeability layer increases, the distribution rate increases, and the phenomenon of "profile reversal" occurs, which will have a negative impact on the effect of increasing oil production by chemical flooding.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE357.46

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