【摘要】：聚合物驅(qū)后產(chǎn)液能力通常會(huì)出現(xiàn)一定幅度的下降,與陸上油田相比,海上油田具有層系多、非均質(zhì)性嚴(yán)重、儲(chǔ)層膠結(jié)疏松易出砂、井距大、排量大等特點(diǎn),其注聚后產(chǎn)液能力下降幅度更大,以錦州9-3油田為例,該油田2007年開始注聚,截至2015年8月,平均月產(chǎn)液量與注聚前相比整體下降48%左右,平均單井月產(chǎn)液量最大降幅達(dá)82%,對聚合物驅(qū)開發(fā)效果產(chǎn)生了較大影響。因此,有必要結(jié)合海上油田油藏特征及開發(fā)特點(diǎn),開展海上油田聚合物驅(qū)產(chǎn)液變化規(guī)律及影響因素研究,從而指導(dǎo)聚合物驅(qū)過程中改善產(chǎn)液能力調(diào)整方案的制定。本論文以錦州9-3油田作為研究對象,在調(diào)研國內(nèi)外產(chǎn)液變化研究基礎(chǔ)上,采用油藏工程、數(shù)值模擬與室內(nèi)物理模擬相結(jié)合的方法,研究了含水率、聚合物黏度、滲透率、滲透率級(jí)差4個(gè)因素對產(chǎn)液指數(shù)變化的影響。結(jié)果表明:空白水驅(qū)至聚合物驅(qū)含水95%過程中產(chǎn)液指數(shù)變化曲線分成三段,即上升段、下降段和上翹段。其中,轉(zhuǎn)聚時(shí)機(jī)越早,產(chǎn)液指數(shù)最大降幅越小,反之,產(chǎn)液指數(shù)最大降幅越大,不同轉(zhuǎn)聚時(shí)機(jī)下產(chǎn)液指數(shù)最大降幅在60%~73%之間;滲透率越高,極值距離越小,極值距離變化范圍在0.27~0.83PV間;聚合物黏度越高,產(chǎn)液指數(shù)最大降幅和極值距離越大,產(chǎn)液指數(shù)最大降幅在11%~75%間,極值距離在0.22~0.55PV間;滲透率級(jí)差越大,產(chǎn)液指數(shù)最大降幅和極值距離越小,產(chǎn)液指數(shù)最大降幅在53%~63%間,極值距離在0.19~0.59PV間。在錦州9-3油田歷史擬合基礎(chǔ)上,研究了34口油井產(chǎn)液指數(shù)變化規(guī)律,結(jié)果表明,產(chǎn)液指數(shù)最大降幅在35%~45%范圍,極值距離在0.1~0.3PV范圍。
[Abstract]:Compared with onshore oil fields, offshore oilfields are characterized by many layers, serious heterogeneity, loose cementation, easy sand production, large well spacing and large displacement. For example, Jinzhou 9-3 oilfield began to inject polymer in 2007. By August 2015, the average monthly liquid production decreased by about 48% compared with that before polymer injection. The maximum drop of monthly liquid production in single well is 82%, which has a great influence on polymer flooding. Therefore, it is necessary to combine the characteristics of offshore oil field reservoir and development characteristics, to carry out research on the variation law and influencing factors of polymer flooding in offshore oil field, so as to guide the formulation of the adjustment scheme for improving the production capacity of polymer flooding. This paper takes Jinzhou 9-3 oilfield as the research object, on the basis of investigation and research on the variation of liquid production at home and abroad, adopts the method of reservoir engineering, numerical simulation and indoor physical simulation to study water cut, polymer viscosity and permeability. The influence of four factors of permeability difference on the change of liquid production index. The results show that the change curve of liquid production index is divided into three sections, namely, rising stage, descending section and upwarping section during the process of water flooding from blank water to 95% water cut in polymer flooding. Among them, the earlier the polymerization time, the smaller the biggest drop of liquid production index, whereas, the bigger the biggest drop of liquid production index, the biggest drop of liquid production index is between 60% and 73% under different polymerization time. The higher the permeability is, the smaller the extreme distance is, and the range of extreme distance is between 0.27~0.83PV; The higher the viscosity of polymer, the greater the distance between the maximum drop of liquid yield index and the extreme value. The maximum drop of liquid production index is between 11% and 75%, and the distance of extreme value is between 0.22~0.55PV. The greater the permeability difference, the smaller the maximum drop of liquid production index and the distance between extreme value. The maximum drop of liquid production index is between 53% and 63%, and the distance of extreme value is between 0.19~0.59PV. On the basis of historical fitting of Jinzhou 9-3 oilfield, the variation law of liquid production index in 34 wells is studied. The results show that the maximum drop of liquid production index is in the range of 35 ~ 45% and the distance of extreme value is in the range of 0.1~0.3PV.
【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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