稠油屯途径选择性堵水酸化技术研究

发布时间：2018-01-15 21:40

本文关键词：稠油屯途径选择性堵水酸化技术研究　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：针对目前辽河油田锦州采油厂稠油区块常规酸化效果不理想问题,本文研究出了适合于稠油吞吐井使用的新型选择性堵水酸化技术,有效封堵高含水大孔道,同时解除低渗透层堵塞污染,恢复或增加低渗透层渗透率,解放低渗透层产能。首先根据油田原油物性、油藏特性,通过岩心粉末溶蚀实验优选酸液种类和配比,通过挂片腐蚀实验、铁离子稳定剂筛选、粘土稳定剂筛选等实验优选添加剂,从而确定了酸液配方。在此基础上,研制了一种具有良好耐酸性的乳化油型选择性暂堵剂,在含水率为60%时,堵水后采收率提高了16.22%。然后,对常用的油溶性物质(如石蜡、沥青、油溶性树脂等)进行改性,制备出可以与储层孔喉匹配的粒径可调的凝胶型堵剂,改善了油溶性,增大了强度,提高了耐酸性。分别使用两种堵水剂和所研制的酸化液,开展选择性堵水酸化物理模拟实验研究,通过单岩心和平行并联岩心堵水酸化实验,测定压力变化、采收率变化,研究抗酸性能、封堵率、有效期、配伍性等,确定合理的注入参数,评价其选择性堵水酸化能力。实验表明,不同渗透率岩心并联驱替注入凝胶型堵水剂和混合酸液后,解堵率和封堵率不同,岩心渗透率越高,油层解堵效果越好,而水层封堵效果越差,平均解堵率为53.46-72.67%,平均封堵率64.1-80.7%;不同渗透率岩心并联驱替注入乳化油型耐酸性堵水剂后,平均解堵率为35.99-50.47%,平均封堵率25.1-52.73%。凝胶型堵剂的选择性酸化效果比乳化油型堵水剂效果更好。
[Abstract]:Aiming at the unsatisfactory effect of conventional acidizing in heavy oil block of Jinzhou oil production plant in Liaohe Oilfield, a new type of selective water plugging and acidizing technology suitable for heavy oil huff and puff well is studied in this paper, which can effectively block high water cut large pore path. At the same time, remove the low permeability layer plugging pollution, restore or increase the permeability of the low permeability layer, liberate the low permeability layer productivity. Firstly, according to the oil field crude oil physical properties, reservoir characteristics. The formula of acid solution was determined by selecting the kind and proportion of acid solution through core powder dissolution experiment, selecting additives by hanging sheet corrosion experiment, iron ion stabilizer screening, clay stabilizer screening and so on. A selective temporary plugging agent of emulsified oil with good acid resistance was developed. When the water content was 60%, the recovery factor was increased by 16.22 when the water content was 60%. Then, the oil soluble substances (such as paraffin wax and asphalt) were used. Oil soluble resin was modified to prepare the gel plugging agent which can match the pore throat of reservoir, which can improve the oil solubility and increase the strength. Two kinds of water shutoff agents and acidizing solution were used to carry out the physical simulation study of selective water shutoff acidification. The pressure change was measured by single core and parallel parallel core water shutoff acidification experiment. The change of oil recovery, acid resistance, plugging efficiency, validity period, compatibility, etc., determine reasonable injection parameters, evaluate its selective water plugging and acidification ability. When different permeability cores are injected with gel water shutoff agent and mixed acid in parallel, the removal rate and plugging rate are different. The higher the core permeability is, the better the plugging removal effect of reservoir is, and the worse the plugging effect of water layer is. The average plugging removal rate was 53.46-72.67, the average plugging rate was 64.1-80.7; The average plugging removal rate is 35.99-50.47% after the injection of emulsified oil-resistant acid plugging agent by parallel displacement with different permeability cores. The average plugging rate was 25.1-52.73. The selective acidification effect of gel plugging agent was better than that of emulsified oil water plugging agent.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.2

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