乾安油田酸化解堵技术研究与应用

发布时间：2018-04-05 09:18

本文选题：乾安油田　切入点：油层堵塞　出处：《吉林大学》2015年硕士论文

【摘要】：乾安油田属于低孔、低渗、低丰度非均质油藏,在开采过程中容易造成地层堵塞,开发难度很大。利用各种酸化体系的解堵技术解除地层堵塞,提高采收率、延缓递减率,是吉林油田稳产的重要手段之一。本文根据对乾安油田地层堵塞机理的研究,通过大量的现场及资料调研,分析乾安油田可能存在的六种堵塞类型:有机堵、无机堵、水堵和乳化堵、粘土微粒运移产生的堵塞、外来固相可能造成的堵塞、润湿反转对地层产生的影响。通过对各种酸化体系的筛选和性能评价,选取了四种增产效果较好、比较常见的、安全的、环保的酸化体系进行现场研究应用,并对现场应用效果进行了评价。针对乾安油田的砂岩地层,堵塞特征明显,使用QCG-T复合土酸体系酸化是最有效的;针对油气显示好而试油效果、井同层位邻井高产而本井低产的层的油井,使用TCAH-1螯合酸体系进行深部酸化;针对渗透率更低的低渗致密砂岩油层堵塞,使用KTAH-1生物螯合酸体系;针对开采层段多、渗透率差异性大的油井采取SRZ泡沫酸体系进行酸化。研究结果表明:QCG-T复合土酸体系对砂岩地层堵塞特征明显的油井解堵是非常有效的;TCAH-1螯合酸体系和KTAH-1生物螯合酸体系能有效解除地层深部堵塞;SRZ泡沫酸体系中产生的泡沫有暂堵作用,对开采层段多、层间渗透率差异性大的油井不仅能对高渗透层进行解堵,也能进入低渗透层,对低渗透层进行解堵。
[Abstract]:Gan'an Oilfield is a heterogeneous reservoir with low porosity, low permeability and low abundance.It is one of the important means of stable production in Jilin Oilfield to use various acidizing systems to remove formation plugging, improve oil recovery and delay decline rate.Based on the study of formation plugging mechanism in Gan'an Oilfield and through a lot of field and data investigation, this paper analyzes six possible plugging types in Gan'an Oilfield: organic plugging, inorganic plugging, water plugging and emulsifying plugging, and plugging caused by clay particle migration.External solids may cause blockage and wetting reversal on the formation.Through the screening and performance evaluation of various acidizing systems, four kinds of acidizing systems, which are relatively common, safe and environmentally friendly, are selected for field research and application, and the field application effects are evaluated.In view of the obvious plugging characteristics of sandstone formation in Gan'an Oilfield, acidizing with QCG-T compound soil acid system is the most effective, and for the wells with good oil and gas performance and oil test effect, the wells with high production and low production are located in the same layer.TCAH-1 chelate acid system is used for deep acidification; KTAH-1 biological chelate acid system is used for plugging low permeability tight sandstone reservoir with lower permeability; SRZ foam acid system is used for oil wells with many production layers and different permeability.The results show that the complex soil acid system of QCG-T is very effective in removing the plugging of oil wells with obvious plugging characteristics in sandstone formation. TCAH-1 chelate acid system and KTAH-1 biological chelate acid system can effectively relieve the formation plugging in the foam acid system.The foam has a temporary plugging effect.The oil wells with many production layers and great differences in interlayer permeability can not only remove the plugging of the high permeability layer, but also enter the low permeability layer and remove the plugging of the low permeability layer.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358.5

【相似文献】