本文選題：強(qiáng)堿三元體系　切入點(diǎn)：孔隙結(jié)構(gòu)　出處：《東北石油大學(xué)》2017年碩士論文

【摘要】：我國絕大多數(shù)油田已進(jìn)入高含水開發(fā)后期,隨著主力油層注聚潛力的減小,尤其是高含水開采階段,無論是經(jīng)濟(jì)指標(biāo),還是技術(shù)指標(biāo),都將變差。主力油層產(chǎn)量在逐年下降,各油田在做好提高主力油層采油技術(shù)的同時(shí),加大了對孔滲性差的二類油層的開發(fā)力度,力保油田的可持續(xù)性發(fā)展。因此,研究三元復(fù)合體系在二類油層中的驅(qū)油效果對油田進(jìn)一步開采具有重要的指導(dǎo)意義。本文以強(qiáng)堿三元復(fù)合體系和薩中二類油層為研究對象,通過靜態(tài)浸泡實(shí)驗(yàn)及常規(guī)壓汞實(shí)驗(yàn)研究了強(qiáng)堿三元復(fù)合體系對儲(chǔ)層巖石的溶蝕作用其對孔隙結(jié)構(gòu)的影響;利用掃描電鏡法研究了強(qiáng)堿三元復(fù)合體系中聚合物分子形態(tài)的影響因素;通過流動(dòng)性實(shí)驗(yàn)研究了強(qiáng)堿三元復(fù)合體系在二類油層中的注入能力;通過微觀可視化驅(qū)油實(shí)驗(yàn)研究了強(qiáng)堿三元復(fù)合體系的微觀驅(qū)油機(jī)理;通過雙管并聯(lián)實(shí)驗(yàn)研究了副段塞粘度對驅(qū)油效果的影響及不同滲透率級差下強(qiáng)堿三元復(fù)合體系的驅(qū)油效果。結(jié)果表明:隨著堿濃度的增大,強(qiáng)堿三元復(fù)合體系對儲(chǔ)層的溶蝕作用增強(qiáng);剪切作用對聚合物分子線團(tuán)尺寸有影響,剪切后聚合物分子鏈之間的相互纏繞作用減弱,空間網(wǎng)狀結(jié)構(gòu)被破壞;強(qiáng)堿三元復(fù)合體系主要是通過降低界面張力來提高殘余油啟動(dòng)能力,通過乳化作用使殘余油以油滴或油絲的形式運(yùn)移;在非均質(zhì)雙管并聯(lián)巖心中,通過適當(dāng)降低副段塞粘度可提高驅(qū)油效果,滲透率級差越大,驅(qū)油效果越差。
[Abstract]:Most oil fields in China have entered the late stage of high water cut development. With the decrease of the potential of polymer injection in the main reservoirs, especially in the stage of high water cut production, both economic and technical indicators will become worse.The production of the main reservoir is decreasing year by year. While improving the oil production technology of the main reservoir, the development of the second class reservoir with poor porosity and permeability has been increased, and the sustainable development of the oil field has been guaranteed.Therefore, it is of great significance to study the flooding effect of ASP system in the second class reservoir.In this paper, the influence of the dissolution of strong alkali ternary system on the pore structure of reservoir rock was studied by static immersion test and conventional mercury injection experiment, taking the strong alkali ternary composite system and the second class oil layer of Sazhong as the research objects.The influencing factors of polymer molecular morphology in strong alkali ternary system were studied by scanning electron microscope, and the injection ability of strong alkali ternary composite system in the second class oil layer was studied by fluidity experiment.The microcosmic oil displacement mechanism of strong alkali ternary composite system was studied by microscopic visualization oil displacement experiment, and the effect of the viscosity of secondary slug on oil displacement effect and the oil displacement effect of strong alkali ternary compound system under different permeability levels were studied by double pipe parallel experiment.The results show that with the increase of alkali concentration, the dissolution of the reservoir is enhanced by the strong alkali ternary composite system, the size of polymer molecular coils is affected by shearing, and the intertwining of polymer molecular chains is weakened after shearing.The space network structure was destroyed, the strong alkali ternary composite system mainly improved the starting ability of residual oil by reducing the interfacial tension, and the residual oil was transported in the form of oil droplets or oil wires through emulsification.The oil displacement effect can be improved by properly reducing the viscosity of the secondary slug, and the greater the permeability difference, the worse the displacement effect.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357.46

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