在高温高压和高含水率井中提高阻垢剂的挤压保留率——实验室到现场的案例研究

L. Sutherland, M. Jordan
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引用次数: 0

摘要

在油气井中进行挤压处理以防止无机结垢形成的实践已经应用了30多年,在此期间,人们对保留抑制剂化学物质的不同机制进行了评估。多年来,通过相互溶剂的增强吸附和活性抑制剂在储层矿物表面的完全沉淀,补充了抑制剂保留、吸附/解吸的简单机制。先前发表的研究表明,可以通过添加“挤压寿命增强剂”来增强磷酸盐类阻垢剂在砂岩储层中的保留率。该化学品通常是一种高电荷、低分子量的聚合物,可应用于水垢挤压处理的预冲洗或过冲洗阶段。迄今为止,这些研究都是使用低温(85°C)沙包测试进行的。本文详细介绍了在高温(146°C)现场条件下进行的实验室工作,以确定挤压寿命增强剂在现场应用中的使用资格。介绍了使用MEA膦酸盐(EABMPA、乙醇胺双(亚甲基膦酸))和聚合物挤压寿命增强剂添加剂进行地层损害/抑制剂回流岩心驱油的结果。岩心驱油结果表明,在挤压方案的溢流阶段添加添加剂可使抑制剂的使用寿命延长19%。延长挤压处理的能力意味着减少了注入的挤压液处理量,因为注入的液体量是被处理井的一个问题,因此降低了相关的延油成本。本文还将介绍在北海油田进行的最初两次现场试验处理所获得的现场数据。该试验井先前已使用与增强剂试验相同的MEA膦酸盐处理了十多次,从而可以直接比较处理效果。应用于井的处理方案没有改变处理井的清理速度,在井回流过程中也没有出现工艺中断。现场试验处理的初始阻垢剂回报显示了岩心驱油研究所建议的预期改善。该研究为在具有挑战性的高温结垢环境中验证和试验新技术提供了遵循的流程,并为精心设计的化学品选择和评估程序提供了支持,从而为行业带来了价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing Scale Inhibitor Squeeze Retention in HT/HP & High Water Rate Wells - Laboratory to Field Case Study
The practice of squeeze treatments to oil/gas production wells to prevent inorganic scale formation has been applied for over 30 years and during that period different mechanisms to retain the inhibitor chemical have been evaluated. The simple mechanism of inhibitor retention, adsorption/desorption has been complemented over the years by enhanced adsorption via mutual solvent and full precipitation of the active inhibitor onto the mineral surface of the reservoir. Previously published studies have shown that the retention of phosphonate scale inhibitors in sandstone reservoirs can be enhanced through the addition of a ‘squeeze life enhancer’. This chemical, typically, a highly charged, low molecular weight polymer can be applied in either the preflush or overflush stage of the scale squeeze treatment. To date these studies have been conducted using low temperature (85°C) sandpack testing. This paper details the laboratory work carried out under high temperature (146°C) field conditions to qualify the use of the squeeze life enhancer for field application. The results of the formation damage/inhibitor return corefloods using an MEA phosphonate (EABMPA, Ethanolaminebis(Methylene Phosphonic Acid)) and polymeric squeeze life enhancer additive are presented. The coreflood results indicated that the addition of the additive within the overflush stage of the squeeze program resulted in a 19% extension of the inhibitor lifetime. The ability to extend the squeeze treatment was translated into reduced injected squeeze fluid treatment volume as injected fluid volumes was an issue for the wells being treated and therefore reduced associated oil deferment costs. The paper will also present field data obtained from the initial two field trial treatments which were carried out in a North Sea field. The trial well had been treated more than ten times previously with the same MEA phosphonate as applied in the enhancer trial making direct comparison of the treatment performance possible. The treatment program applied to the wells resulted in no change to the clean-up rates of the treated well and no process upset during well reflow. The initial scale inhibitor returns from the field trial treatments showed the expected improvement suggested from the coreflood study. The study brings value to the industry by providing the process to follow for qualifying and trialling a new technology in a challenging high temperature scaling environment with the results from the field supporting the carefully designed chemical selection and evaluation program.
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