發(fā)布時(shí)間：2018-10-24 22:49

【摘要】：大慶油田水井注入壓力統(tǒng)計(jì)資料表現(xiàn),前期三元復(fù)合體系注入壓力接近儲(chǔ)層巖石破裂壓力,這表明后續(xù)進(jìn)一步提高采收率措施預(yù)留壓力上升空間很小。因此,在進(jìn)行進(jìn)一步提高采收率措施增油效果評(píng)價(jià)時(shí),必須考慮實(shí)際可能的壓力升高幅度(聚合物驅(qū)后進(jìn)一步提高采收率方法及其技術(shù)經(jīng)濟(jì)效果評(píng)價(jià)王亮盧祥國)。否則,就會(huì)出現(xiàn)室內(nèi)通過大幅度提高注入壓力實(shí)現(xiàn)了擴(kuò)大波及體積目的、而礦場卻難以達(dá)到壓力升幅要求甚至注入困難的尷尬局面。本文開展強(qiáng)堿三元復(fù)合驅(qū)后多元注入體系提高采收率室內(nèi)實(shí)驗(yàn)研究,通過室內(nèi)實(shí)驗(yàn)研究,篩選了強(qiáng)堿三元復(fù)合驅(qū)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(diào)剖體系,進(jìn)行性能評(píng)價(jià)實(shí)驗(yàn)研究和物理模擬實(shí)驗(yàn),以采收率、含水率和注入壓力為評(píng)價(jià)指標(biāo),以大慶杏樹崗油田為實(shí)驗(yàn)平臺(tái),在恒速和恒壓條件下開展了強(qiáng)堿三元復(fù)合驅(qū)后進(jìn)一步提高采收率方法增油效果實(shí)驗(yàn)研究。結(jié)果表明,在恒速實(shí)驗(yàn)條件下,強(qiáng)堿三元復(fù)合驅(qū)后采用高濃度聚合物溶液、無堿二元復(fù)合體系、弱堿三元復(fù)合體系、“聚合物凝膠+弱堿三元復(fù)合體系”和“聚合物凝膠+無堿二元復(fù)合體系”驅(qū)都可以進(jìn)一步提高采收率,其中“聚合物凝膠+無堿二元復(fù)合體系”驅(qū)技術(shù)經(jīng)濟(jì)效果較好。在恒壓實(shí)驗(yàn)條件下,高濃聚合物采液速度較低,生產(chǎn)持續(xù)時(shí)間較長,相應(yīng)操作費(fèi)較高,技術(shù)經(jīng)濟(jì)效果變差。與其它恒壓驅(qū)油方式相比較,“聚合物凝膠+無堿二元復(fù)合體系”驅(qū)采收率增幅較大,采液速度較高,技術(shù)經(jīng)濟(jì)效果較好。在強(qiáng)堿三元復(fù)合體系和后續(xù)進(jìn)一步提高采收率驅(qū)油劑注入過程中,由于巖心的非均質(zhì)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(dāng)注入進(jìn)入中后期時(shí),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(zhuǎn)”現(xiàn)象,進(jìn)而對化學(xué)驅(qū)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(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357.46

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