通过实验室和现场验证的方法,开发一种去除和抑制沥青质的综合解决方案

Hussain A. Almajid, Alaa S. Shawly, Abdullah Al-Qasim
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引用次数: 0

摘要

沥青质沉积物被认为是油田面临的最常见的问题之一,其颗粒稳定性低,可能导致油井潜力丧失,危及井筒可达性,并导致电潜泵(ESP)过早失效。传统上,这些沉积物是用碳氢化合物溶剂处理的,这种溶剂闪点低,既危险又昂贵。本文的目的是提供一种全面的解决方案,有效地去除近井区域形成的沥青质和填砂堆积。本文还将提供准确预测生产阶段沥青质沉淀的计算分析,以优化抑制工艺。采用实验室方法测试了不同水基溶剂类型的有效性,包括芳香族、脂肪族和杂原子溶剂,而不是常用的碳氢化合物溶剂,如二甲苯,来溶解从现场收集的沥青质样品,并将其置于厌氧条件下。全面评估沥青质的基本性质,包括饱和烃、芳烃、树脂和起始压力,并将其纳入计算模型,以了解和准确预测沥青质的沉淀行为。与传统系统相比,新开发的系统在处理效果、部署成本以及健康、安全和环境(HSE)方面具有显著优势,因为它的闪点相对较高。新系统使用一种水基溶剂,使地层处于水湿状态,而不是油湿状态,从而形成一个屏障层,可以延缓沥青质的积累,减少处理频率。将讨论使用这种新开发的水基芳香族溶剂的现场实施和作业后效果,包括溶解井下沥青质堆积的处理效果。根据该模型获得的结果,已经实施了沥青质抑制方案,并进行了频繁的检查,发现在延长的生产周期内没有沥青质沉积。本文介绍了一种经过实验室验证和现场测试的水基芳香溶剂,它可以有效地溶解沥青质积聚,从而提高油井潜力,同时减少所需处理的频率,从而最大限度地提高生产率。该系统的独特之处在于,它提供了一种高闪点水/溶剂混合物,其溶解能力通常大于二甲苯,另外还有一个好处,即使地层保持强烈的水湿性。开发的计算模型有助于减少处理频率,从而降低费用并保持产量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Developing an Integrated Solution to Remove and Inhibit Asphaltene Deposits Through a Laboratory and Field Proven Approach
Asphaltene deposits are considered one of the most common issues facing oil fields with low particle stability that can result in loss of well potential, jeopardize wellbore accessibility and cause premature electrical submersible pump (ESP) failures. Traditionally, these deposits are treated with hydrocarbon based solvents, which have low flashpoints, making them hazardous and expensive. The objective of this paper is to provide a comprehensive solution to effectively remove asphaltene and sand fill accumulation that forms in the near wellbore region. This paper will also provide a computational analysis to accurately predict asphaltene precipitation during the production phase for optimized inhibition process. A laboratory approach was implemented to test the effectiveness of different water based solvent types, including aromatic, aliphatic and heteroatom instead of the commonly used hydrocarbon solvents such as xylene to dissolve asphaltene samples collected from the field and placed under anaerobic conditions. A thorough evaluation of fundamental asphaltene properties, including saturates, aromatics, resins and onset pressure, is incorporated into a computational model to understand and accurately predict asphaltene precipitation behavior. The newly developed system offers significant advantages compared to the traditional system in terms of treatment effectiveness, deployment cost and health, safety, and environment (HSE) due to its relatively high flashpoint. The new system utilizes a water based solvent that leaves the formation in a water wet state instead of oil wet, thus creating a barrier layer that will delay asphaltene accumulation and reduce treatment frequency. Field implementation and post-job results utilizing this newly developed water based aromatic solvent will be discussed, including treatment effectiveness to dissolve downhole asphaltene accumulations. Asphaltene inhibition programs have been implemented based on the results acquired from this model and frequent inspection conducted showed no asphaltene deposition over extended production periods. This paper provides a laboratory proven and field tested water based aromatic solvent that is effective in dissolving asphaltene accumulations resulting in improved well potential while reducing the frequency of required treatments thus maximizing productivity. This system is unique as it provides a high flashpoint water/solvent mixture with solvency power often greater than xylene with the additional benefit of leaving the formation strongly water-wet. The developed computational model helped to reduce the treatment frequency resulting in reduced expenses and sustained production.
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