聚驱抽油杆下行滞后井解堵配方及工艺研究

发布时间：2018-04-15 03:16

本文选题：聚驱采出井 + 解堵剂配方　；参考：《东北石油大学》2015年硕士论文

【摘要】：聚合物驱油技术已在大庆油田广泛应用,并取得了显著效果,但在提高采收率、为油田增产增效的同时,也带来了许多问题。其中,较为突出的问题是与水驱相比,聚驱采出液中聚合物浓度明显升高,采出液性质发生变化,由于含聚采出液具有非牛顿流体特性的粘弹性,使抽油杆在下行运动中受阻力增加,导致抽油杆下行滞后甚至偏磨,严重时会产生断杆,从而缩短检泵周期,影响聚驱正常生产。而关于采出井解堵这一现实问题却较少有人研究,现多数油田针对该问题多采用热洗、刮削、超声波等物理来方法维持生产,而未从化学解堵的角度考虑。本文针对这一问题首先分析了大庆油田第六采油厂高浓度聚驱采出井井壁垢样组成及采出液性质和成分,并研究了采出液流变性及粘弹性对抽油杆受力影响,在此基础上,室内研制出符合现场实际要求的解堵剂配方,配方包括主剂(氧化剂、复配酸)及添加剂(铁离子稳定剂、阳离子共聚物及缓蚀剂),其中当氧化剂浓度为3%,氨基磺酸与盐酸复配质量浓度比为4:1时,降解除垢效果最佳,且对抽油杆等金属腐蚀性较小;筛选并研制出了解堵剂添加剂:铁离子稳定剂(1%乙酸)、低聚阳离子共聚物(0.4%)及缓蚀剂(0.1%)对聚合物凝胶降粘率可达80%,除垢率可达55%以上,解堵剂各药剂间具有配伍性,且对铁挂片腐蚀速率小于1mm"a,并具有相对稳定的性质。在岩心流动试验中对岩心渗透率恢复率在75%以上。室内研制出的解堵剂对现场进行了应用,抽油杆下行滞后现象消失。
[Abstract]:Polymer flooding technology has been widely used in Daqing Oilfield, and has achieved remarkable results. However, while increasing oil recovery, increasing production and increasing efficiency, it also brings many problems.The more prominent problem is that the polymer concentration in the produced solution of polymer flooding is obviously higher than that of water flooding, and the properties of the produced liquid are changed, due to the viscoelasticity of non-Newtonian fluid characteristics of the polymer produced liquid.The resistance of the sucker rod in the downward movement is increased, which leads to the downlink lag or even partial wear of the sucker rod, which will lead to the breaking of the rod when it is serious, thus shortening the period of pump inspection and affecting the normal production of polymer flooding.However, there are few researches on the practical problem of plugging removal in production wells. Most oilfields use physical methods such as heat washing, scraping and ultrasonic wave to maintain production, but not from the angle of chemical plugging removal.In order to solve this problem, this paper first analyzes the scale sample composition and the property and composition of the produced fluid in the well wall of high concentration polymer flooding production well in Daqing Oilfield, and studies the effect of rheology and viscoelasticity of the produced fluid on the force of the sucker rod, and on the basis of the analysis,The formula of plugging agent was developed in laboratory, which includes main agent (oxidant, compound acid) and additive (iron ion stabilizer).When the concentration of oxidant is 3 and the mass ratio of aminosulfonic acid to hydrochloric acid is 4:1, the scale removal effect is the best, and the corrosion to sucker rod and other metals is less.Selecting and developing additives for plugging agent: iron ion stabilizer 1% acetic acid, oligomeric cationic copolymers 0.4%) and corrosion inhibitor 0. 1) the viscosity reduction rate and scale removal rate of polymer gel can reach 80% and 55%, respectively.The corrosion rate of iron hanging sheet is less than that of 1mm ", and it has relatively stable property.In the core flow test, the recovery rate of core permeability is more than 75%.The deplugging agent developed in the laboratory was applied in the field, and the downlink lag of sucker rod disappeared.
【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】：TE358.5

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