【摘要】：三元復(fù)合驅(qū)是油田開采后期為提高原油采收率而提出的一種三次采油技術(shù),三元復(fù)合驅(qū)包括強(qiáng)堿三元復(fù)合驅(qū)和弱堿三元復(fù)合驅(qū)。由于三元復(fù)合驅(qū)存在對(duì)地層傷害較大、結(jié)垢嚴(yán)重等現(xiàn)象,因此,研究三元復(fù)合驅(qū)體系對(duì)采收率的影響,對(duì)油田進(jìn)一步開采具有重要的指導(dǎo)意義。本文以大慶杏樹崗油田為實(shí)驗(yàn)平臺(tái),采用黏度測(cè)試驗(yàn)方法研究了聚合物、聚表二元體系、三元復(fù)合體系、聚合物凝膠的黏度變化規(guī)律;在三管并聯(lián)均質(zhì)巖心條件下開展了強(qiáng)堿三元復(fù)合驅(qū)后弱堿三元復(fù)合驅(qū)、無堿二元復(fù)合驅(qū)、高濃度聚合物驅(qū)、“凝膠1+弱堿三元復(fù)合體系”、“凝膠2+體膨顆粒+弱堿三元復(fù)合體系”、“凝膠1+無堿二元復(fù)合體系”和“凝膠2+體膨顆粒+無堿二元復(fù)合體系”驅(qū)提高采收率方法增油效果實(shí)驗(yàn)研究,在“五點(diǎn)法”仿真物理模型條件下開展了強(qiáng)堿三元復(fù)合驅(qū)后高濃聚合物和“調(diào)剖劑+弱堿三元復(fù)合驅(qū)”提高采收率方法增油效果實(shí)驗(yàn)研究。結(jié)果表明:強(qiáng)堿三元復(fù)合驅(qū)過程中,調(diào)驅(qū)劑注入初期和中期高滲透層分流率降低,中低滲透層分流率升高。當(dāng)注入到中后期時(shí),中低滲透層分流率降低,高滲透層分流率升高,即出現(xiàn)所謂“剖面反轉(zhuǎn)”現(xiàn)象;與調(diào)驅(qū)劑洗油能力相比較,其擴(kuò)大波及體積能力對(duì)采收率貢獻(xiàn)率較大。因此,強(qiáng)堿三元復(fù)合驅(qū)后注入調(diào)驅(qū)劑必須具有更強(qiáng)流度控制和洗油能力,只有這樣才能較大幅度提高采收率;在五點(diǎn)仿真模型上,強(qiáng)堿三元復(fù)合體系后采用“恒壓實(shí)驗(yàn)”方法注入高濃聚合物溶液和“凝膠2+體膨顆粒+弱堿三元體系”都能夠進(jìn)一步提高采收率,采收率增幅分別為11.5%和12.9%;在五點(diǎn)仿真模型上,強(qiáng)堿三元復(fù)合驅(qū)后剩余油主要在中滲層遠(yuǎn)離注入端地帶和整個(gè)低滲層,高濃聚合物驅(qū)和“凝膠2+體膨顆粒+弱堿三元”驅(qū)驅(qū)替對(duì)象主要就是這部分剩余油;從經(jīng)濟(jì)效果方面考慮,強(qiáng)堿三元復(fù)合驅(qū)后推薦注入0.7 PV高濃聚合物溶液。從技術(shù)效果方面考慮,強(qiáng)堿三元復(fù)合驅(qū)后推薦注入“0.1 PV(凝膠2+體膨顆粒)+0.35 PV弱堿主段塞+0.15 PV弱堿副段塞+0.1 PV后續(xù)聚合物”組合。
[Abstract]:ASP flooding is a kind of tertiary oil recovery technology proposed to improve oil recovery in the later stage of oilfield production. ASP flooding includes strong alkali ASP flooding and weak alkali ASP flooding. Because the formation damage and scaling are serious in ASP flooding, it is very important to study the effect of ASP flooding system on oil recovery. On the platform of Daqing Xingshugang Oilfield, the viscosity change of polymer, ternary system and polymer gel was studied by viscosity test method in this paper. Under the condition of three parallel homogeneous cores, weak alkali ternary flooding, alkali free binary composite flooding, high concentration polymer flooding, "gel 1 weak alkali ternary compound system" were carried out after strong alkali ternary flooding. Experimental study on enhanced oil recovery effect of "weak alkali ternary compound system of gel 2 bulking particles", "gel 1 alkali-free binary composite system" and "gel 2 expansion particle no alkali binary composite system". Under the condition of "five-point method" simulation physical model, the experimental study on enhancing oil recovery effect of high concentration polymer and "profile control agent weak alkali ternary flooding" after strong alkali ternary flooding was carried out. The results show that in the process of strong alkali ASP flooding, the distributary rate of high permeability layer decreases in the early and middle period of the injection of adjusting flooding agent, and the distribution rate of low and middle permeability layer increases. At the middle and late stage of injection, the distributary rate of middle and low permeability layers decreases, and the distribution rate of high permeability layer increases, that is, the phenomenon of "profile inversion" occurs, and compared with the oil washing ability of flooding adjuster, its expanded sweep volume capacity contributes more to oil recovery. Therefore, the injection adjuster must have stronger mobility control and oil washing ability after strong alkali ASP flooding, only in this way can oil recovery be greatly improved. After the strong alkali ternary system was injected into the high concentration polymer solution and the gel two-body dilatation particle weak alkali ternary system by "constant pressure experiment", the recovery factor was further improved by 11.5% and 12.9% respectively, and in the five-point simulation model, the oil recovery was increased by 12.5% and 12.9%, respectively. The remaining oil after strong alkali ASP flooding is mainly located far away from the injection end zone and the whole low permeability zone in the middle permeable layer, and the remaining oil is the main displacement object of high concentration polymer flooding and weak alkali ternary flooding. Considering the economic effect, it is recommended that 0.7 PV high concentration polymer solution should be injected after strong alkali ASP flooding. Considering the technical effect, it is recommended to inject "0.1 PV (gel 2 bulking particle) 0.35 PV weak base slug 0.15 PV weak base secondary slug 0.1 PV follow-up polymer" after strong alkali ASP 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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本文編號(hào)：2194090