风城油田稠油油藏氮气泡沫调驱技术研究

发布时间：2018-03-09 15:51

本文选题：稠油油藏　切入点：氮气泡沫调驱　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：风城油田稠油油藏在经历热力试采、蒸汽吞吐规模开发、蒸汽驱等试验阶段之后,由于稠油黏度大,蒸汽与原油的流度比高,蒸汽超覆、指进现象严重,易造成油井间汽窜。并且较低的蒸汽波及系数,导致油井含水升高,周期产油、油汽比、热利用率下降,自然递减率升高,开采效果变差。氮气泡沫具有“堵大不堵小、堵水不堵油”的特性,可以选择性地控制注入流体的流度,降低其在高渗地层中的渗流速度,封堵窜流通道,从而提高波及体积,达到提高采收率的目的。本文根据新疆风城油田重32井区稠油油藏特征,在调研国内外泡沫调驱理论的基础上,开展了相关室内实验研究,取得了以下成果： (1)优选出耐高温的起泡剂,并筛选出性能良好的稳泡剂与助剂,最终结合综合系数法与不稳定系数法确定出泡沫配方的最佳组成：0.3%F4+0.3%F2+0.05%W1+0.05%Z1,体系起泡体积865m1,半衰期185min； (2)对泡沫体系进行了性能评价：耐温性、耐盐性较好,在少量原油存在时较稳定,对集输系统破乳效果影响不大； (3)岩心流动实验结果表明：泡沫驱气液比为1：1时,阻力因子为47.4,封堵效果较好；气液同时注入产生的泡沫阻力系数较大；该泡沫体系在含油饱和度25%左右时,阻力因子变化较大；并联填砂模型表明泡沫的调剖能力较好；水驱后采用氮气泡沫驱采收率提高7.54%,总采收率达到82.51%； (4)氮气泡沫的微观结构与微观渗流驱油机理表明：该泡沫能够稳定存在,同时泡沫对非均质油藏的开发是有利的； (5)对典型的注汽井进行泡沫调驱施工方案设计及配注工艺技术研究。本文的研究成果对于风城油田稠油油藏的开采有一定的借鉴意义。
[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.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

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