气体示踪剂在原油中扩散机理实验研究

发布时间：2018-06-14 06:59

  本文选题：原油 + 气体示踪剂　； 参考：《西南石油大学》2017年硕士论文

【摘要】：我国绝大多数油藏具有复杂的油藏储集体和流体性质,并且油藏开发后期大都采用注气驱油提高采收率,但是由于对注入气的运动规律缺乏认识,需要进行井间注气示踪监测,不仅能够为后期注气措施提供及时有效的支撑,还能降低开发风险和难度。然而,目前国内外对气体示踪剂的研究都倾向于现场应用,缺少相应的室内评价方法,因此,建立一套气体示踪剂室内评价方法尤为重要。本文以建立一套油藏注气示踪剂室内评价方法为目的,采用室内实验和软件模拟等多种手段对气体示踪剂的性质进行了研究,建立了气体示踪剂的气相色谱-质谱仪检测方法,通过对气体示踪剂的筛选、稳定性评价实验、在油水中的溶解实验以及扩散实验对气体示踪剂检测技术进行了认识研究,得到了以下认识:对17种常用气体示踪剂的四种筛选参数进行调研汇总,经过筛选参数的规范化处理后,运用动态综合评价模型,编制程序并且成功进行了气体示踪剂的筛选,不同于以往通过室内实验对示踪剂进行筛选的方法,本次筛选方法更加简单有效。最终优选出了四种适用于本次评价实验的气体示踪剂,分别为:六氟化硫、八氟环丁烷、三氟乙烷、七氟丙烷。在对气体示踪剂的稳定性进行研究时,提出了一种新的思路,即运用气相色谱-质谱仪进行检测时,采用全扫描模式,对比实验前后曲线图,在排除杂质干扰的情况下,若产生了新的峰,即可认为该物质不稳定。实验表明六氟化硫、八氟环丁烷、三氟乙烷和七氟丙烷四种气体示踪剂在地层条件下的稳定性较强。运用室内实验与Hysys软件验证相结合的方法对气体示踪剂在123℃和41.37MPa下,在地层水和地层原油中的溶解进行了研究,结果表明六氟化硫、八氟环丁烷、三氟乙烷和七氟丙烷这四种气体示踪剂在实验条件下难溶于水,但溶于油,且水气分配系数和油气分配系数都较小。在气体示踪剂扩散实验设计阶段,针对以往扩散系数测定中对扩散管参数的不确定性,通过Fluent软件对扩散管尺寸进行了优化,模拟结果表明,扩散管直径越小,从不稳定流动发生的时间越短,实验所测结果越精确。在气体示踪剂扩散系数测定实验中,利用压力降落法,通过对扩散管中的压力进行监测,再利用目前已有的数学模型进行求解,最终得到了地层条件下四种示踪剂在油样中的扩散系数。
[Abstract]:Most of the reservoirs in China have complex reservoir storage and fluid properties, and most of them use gas injection to improve oil recovery in the later stage of reservoir development. However, due to the lack of understanding of the movement of injected gas, it is necessary to carry out cross-well gas injection tracer monitoring. It can not only provide timely and effective support for later gas injection measures, but also reduce the risk and difficulty of development. However, the research on gas tracers at home and abroad tends to be applied in the field and lacks the corresponding indoor evaluation methods. Therefore, it is very important to establish a set of indoor evaluation methods for gas tracers. In order to establish a set of indoor evaluation method of gas tracer for reservoir, the properties of gas tracer are studied by laboratory experiment and software simulation, and the gas chromatography-mass spectrometer detection method of gas tracer is established. Through the screening of gas tracer, the stability evaluation experiment, the dissolution experiment in oil and water and the diffusion experiment, the detection technology of gas tracer was studied. The following conclusions are obtained: the four screening parameters of 17 kinds of commonly used gas tracers are investigated and summarized. After the standardization of the screening parameters, the dynamic comprehensive evaluation model is used to compile the program and the gas tracer screening is successfully carried out. This screening method is more simple and effective than the previous method of screening tracers through laboratory experiments. Finally, four kinds of gas tracers suitable for this evaluation experiment were selected: sulfur hexafluoride, octafluorocyclobutane, trifluoroethane and heptafluoropropane. In the study of the stability of gas tracer, a new way of thinking is put forward, that is, when gas chromatography-mass spectrometer is used to detect the gas tracer, the full scanning mode is used to compare the curves before and after the experiment, and the impurity interference is eliminated. If a new peak is created, the substance can be considered unstable. The results show that four gas tracers, sulfur hexafluoride, octafluorocyclobutane, trifluoroethane and heptafluoropropane, are stable under stratigraphic conditions. The dissolution of gas tracer in formation water and formation crude oil at 123 鈩，

本文编号：2016564