大庆某区块东部过渡带弱碱三元驱油技术研究

发布时间：2018-05-31 03:53

本文选题：弱碱三元体系 + 注入能力　；参考：《东北石油大学》2017年硕士论文

【摘要】：三元复合驱可以提高驱替体系的驱油效率和波及体积,同时具有较低的界面张力、较好的粘稳性和乳化性能而已经成为大庆油田的主导开采技术。大量的实验表明,强碱三元驱油体系对地层以及驱油设备伤害较大,已是一种不建议应用的驱油方式,但三元体系对水后采收率的提高作用较为明显,所以本文针对大庆某区块东部过渡带渗透率和原油特性筛选出弱碱三元复合体系最优体系驱油配方。本文在对三元驱油机理进行了一定分析的基础上,对弱碱三元复合体系的各项性能,主要包括弱碱三元体系界面特性、粘稳性、乳化特性、吸附特性等方面进行了研究评价,并在实验中通过研究不同碱、表活剂浓度对三元体系各项性能的影响,进行了初步优选,实验结果表明了弱碱三元体系可在碱浓度为1.0%～1.2%,活性剂浓度大于0.2%之后,可以达到10-3mN/m的超低界面张力。随后开展了聚合物分子量、浓度和岩心渗透率匹配关系的室内实验研究,计算了弱碱三元体系的阻力系数、残余阻力系数等参数,给出了弱碱三元体系与东部过渡带油层渗透率的适应性关系。通过室内物理模拟驱油实验,对比分析了三元复合驱不同主段塞、副段塞、前置段塞、后续保护段塞驱油效果,最终优选出弱碱三元复合驱最优体系配方:前置段塞:0.03PV×[1500mg/L 1600×10~4HPAM];三元主段塞:0.35PV× [0.2%WPS+1.2%Na_2CO_3+2000mg/L 1600×10~4HPAM];三元副段塞:0.15PV× [0.1%WPS+1.0%Na_2CO_3+2000mg/L 1600×10~4HPAM];后续保护段塞:0.2PV×[1500mg/L 1600×10~4HPAM]。
[Abstract]:ASP flooding can improve the displacement efficiency and sweep volume of the flooding system, and has low interfacial tension, better viscosity and stability and emulsification performance, which has become the dominant production technology in Daqing Oilfield. A large number of experiments show that the ternary flooding system of strong alkali has great damage to formation and oil displacement equipment, and it is a kind of oil displacement mode which is not recommended to be applied, but the effect of ternary system on the enhancement of water recovery is obvious. In this paper, based on the permeability and crude oil characteristics of the transition zone in the eastern part of Daqing block, the optimum flooding formula of the weak alkali ternary system is selected. Based on the analysis of ternary flooding mechanism, the properties of weak base ternary composite system, including interface property, viscosity stability, emulsification property and adsorption property of weak base ternary system are studied and evaluated in this paper. In the experiment, the effects of different alkali and active agent concentration on the properties of the ternary system were studied. The experimental results show that the weak base ternary system can be obtained when the alkali concentration is 1.0% and the active agent concentration is more than 0.2%. The ultra-low interfacial tension of 10-3mN/m can be achieved. Subsequently, laboratory experiments were carried out on the matching relationship between polymer molecular weight, concentration and core permeability. The resistance coefficient, residual resistance coefficient and other parameters of weak alkali ternary system were calculated. The adaptability relationship between the weak alkali ternary system and the permeability of the eastern transitional zone is given. Through the laboratory physical simulation of oil displacement experiments, the flooding effects of different main slug, secondary slug, front slug and follow-up protection slug of ASP flooding are compared and analyzed. Finally, the optimal formulation of weak base ASP flooding system is selected as follows: preposition slug 0.03PV 脳 [1500mg/L 1600 脳 10~4HPAM]; ternary main slug: 0.35PV 脳 [0.2%WPS 1.2%Na_2CO_3 2000mg/L 1600 脳 10~4HPAM]; ternary secondary slug: 0.15PV 脳 [0.1%WPS 1.0%Na_2CO_3 2000mg/L 1600 脳 10~4HPAM]; follow-up protection slug: 0.2PV 脳 [1500mg/L 1600 脳 10~4HPAM].
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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