本文選題：稠油油藏　切入點：氮氣泡沫調(diào)驅(qū)　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)城油田稠油油藏在經(jīng)歷熱力試采、蒸汽吞吐規(guī)模開發(fā)、蒸汽驅(qū)等試驗階段之后,由于稠油黏度大,蒸汽與原油的流度比高,蒸汽超覆、指進現(xiàn)象嚴重,易造成油井間汽竄。并且較低的蒸汽波及系數(shù),導(dǎo)致油井含水升高,周期產(chǎn)油、油汽比、熱利用率下降,自然遞減率升高,開采效果變差。 氮氣泡沫具有“堵大不堵小、堵水不堵油”的特性,可以選擇性地控制注入流體的流度,降低其在高滲地層中的滲流速度,封堵竄流通道,從而提高波及體積,達到提高采收率的目的。 本文根據(jù)新疆風(fēng)城油田重32井區(qū)稠油油藏特征,在調(diào)研國內(nèi)外泡沫調(diào)驅(qū)理論的基礎(chǔ)上,開展了相關(guān)室內(nèi)實驗研究,取得了以下成果： (1)優(yōu)選出耐高溫的起泡劑,并篩選出性能良好的穩(wěn)泡劑與助劑,最終結(jié)合綜合系數(shù)法與不穩(wěn)定系數(shù)法確定出泡沫配方的最佳組成：0.3%F4+0.3%F2+0.05%W1+0.05%Z1,體系起泡體積865m1,半衰期185min； (2)對泡沫體系進行了性能評價：耐溫性、耐鹽性較好,在少量原油存在時較穩(wěn)定,對集輸系統(tǒng)破乳效果影響不大； (3)巖心流動實驗結(jié)果表明：泡沫驅(qū)氣液比為1：1時,阻力因子為47.4,封堵效果較好；氣液同時注入產(chǎn)生的泡沫阻力系數(shù)較大；該泡沫體系在含油飽和度25%左右時,阻力因子變化較大；并聯(lián)填砂模型表明泡沫的調(diào)剖能力較好；水驅(qū)后采用氮氣泡沫驅(qū)采收率提高7.54%,總采收率達到82.51%； (4)氮氣泡沫的微觀結(jié)構(gòu)與微觀滲流驅(qū)油機理表明：該泡沫能夠穩(wěn)定存在,同時泡沫對非均質(zhì)油藏的開發(fā)是有利的； (5)對典型的注汽井進行泡沫調(diào)驅(qū)施工方案設(shè)計及配注工藝技術(shù)研究。 本文的研究成果對于風(fēng)城油田稠油油藏的開采有一定的借鑒意義。
[Abstract]:Heavy oil reservoirs in Fengcheng Oilfield experienced the test stage of thermal test production, scale development of steam huff and puff, steam drive and so on. Due to the high viscosity of heavy oil, the high mobility ratio of steam to crude oil, the overcovering of steam, the phenomenon of fingering was serious. It is easy to cause steam channeling between wells and lower steam sweep coefficient, which leads to the increase of water cut, the periodic oil production, the ratio of oil to gas, the decrease of heat utilization ratio, the increase of natural decline rate and the deterioration of recovery effect. Nitrogen foam has the characteristics of "blocking large and small, plugging water and not plugging oil." nitrogen foam can selectively control the mobility of injected fluid, reduce its percolation velocity in high permeability strata, and block channeling channels, thus increasing the sweep volume. The purpose of increasing oil recovery is achieved. According to the characteristics of heavy oil reservoir in Zhong32 well area of Fengcheng Oilfield, Xinjiang, based on the investigation of foam flooding theory at home and abroad, the related laboratory experiments are carried out, and the following results are obtained:. (1) the foaming agent with high temperature resistance was selected, and the foaming stabilizers and additives with good properties were screened out. Finally, the optimum composition of foaming formula was determined by the method of comprehensive coefficient and instability coefficient. The optimum composition of foaming formula was determined as follows:: 0.3 0.3 0.05wt% W1 0.05Z1, foaming volume 865 ml, half-life 1855 min; 2) the foam system was evaluated: high temperature tolerance and salt tolerance, stable in the presence of a small amount of crude oil, little influence on the demulsification effect of gathering and transportation system; The results of core flow experiments show that the resistance factor is 47.4 when the gas-liquid ratio of foam drive is 1: 1, and the foam resistance coefficient produced by gas-liquid injection at the same time is larger. When the oil saturation is about 25%, the foam system has a good plugging effect. The parallel sand filling model shows that the profile control ability of foam is better, the recovery factor of nitrogen foam flooding is increased 7.54 and the total recovery is 82.51% after water flooding. 4) the microstructure of nitrogen foam and the mechanism of microcosmic percolation oil displacement show that the foam can exist stably, and the foam is beneficial to the development of heterogeneous reservoir; The design of the typical steam injection wells by foam control flooding and the technology of injection allocation are studied. The research results in this paper can be used for reference in the production of heavy oil reservoirs in Fengcheng Oilfield.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.46

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