新型表面活性剂基金属对金属减摩擦剂的评价

Mohammad Farouk, Z. Al-jalal, Islam M. Hassan, Hope C. Marine, Saleem Al-Hameli, Ridha Al-Abdrabalnabi
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引用次数: 0

摘要

水平井和斜井结构现在非常普遍,因为它们以一种经济有效的方式促进了油藏的排液,但由于连续油管与套管或储层岩石之间的摩擦,这种结构给后续完井和通过连续油管(CT)进行的井底作业带来了挑战。为了解决这个问题,多年来已经使用了各种技术来减少金属表面之间的摩擦,并将连续油管的伸入范围延长到所需的深度。这些技术包括(但不限于)使用专门设计的连续油管管柱(锥形连续油管管柱、管柱表面平滑处理)、使用机械辅助工具(井下连续油管牵引器、连续油管搅拌器或振动器),以及通过使用润滑剂来增加环空流体的润滑,在许多情况下,同时使用多种技术来进一步延长连续油管的深度使用润滑油一直是最简单的技术,因为它不需要投资设备,除了成本之外,还会增加操作的复杂性。在这项研究中,我们正在评估一种基于表面活性剂的环保型金属减摩擦剂的减摩擦性能,该减摩擦剂将被称为润滑剂A,润滑剂A的化学成分以前曾在油田应用中使用过,但作者认为这是首次将这种化学成分用于增强润滑。我们将评估润滑剂A在室温和170°F下的性能,以研究其热稳定性,我们将评估其与CT操作中使用的普通盐水的相容性,特别是在高浓度盐的情况下。我们还将比较润滑剂A与基于共聚物的润滑剂(将标记为润滑剂B)在室温和170°F下的摩擦系数(CoF)降低的性能。还进行了岩心注水试验,以研究含润滑剂A的盐水对储层岩石渗透率的影响。根据我们的实验室测试,润滑剂A在大多数情况下可以将摩擦系数(CoF)降低60-70%,并且在不同盐浓度下与不同的盐水表现出相对较高的相容性,在大多数情况下优于润滑剂B。在岩心注水测试中,润滑剂A的渗透率也没有明显降低,这增加了其在可能会对地层造成损害的作业中的应用潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of Novel Surfactant Based Metal to Metal Friction Reducer
Horizontal and deviated well architectures are now quite common as they facilitate drainage of reservoir in a cost-effective manner, such architectures introduce a challenging environment for subsequent completions and bottom hole operations performed through Coiled Tubing (CT) mainly due to friction between the coiled tubing string and well casing or reservoir formation rocks. To address this, a variety of techniques have been used over the years to reduce the friction between the metallic surfaces and extend the reach of the coiled tubing string to desired depths. Several Such techniques included-but were not limited to- using a specifically designed CT string (tapered CT strings, Pipe surface smoothing treatments), using mechanical aids (downhole coiled tubing tractors, coiled tubing agitators or vibrators) and increasing lubricity of the annulus fluid through the use of lubricants, there has also been many cases in which multiple techniques have been used at the same time to further extend the CT reach.4 The use of lubricants has always been the easiest technique as it does not require investment into equipment which would increase the complexity of the operation in addition to their cost. In this study, we are evaluating the friction reduction performance of an environmentally friendly surfactant-based metal friction reducer which will be called Lubricant A, the chemistry of Lubricant A has been used before in oilfield applications, but the authors believe this is the first time this chemistry is used for lubricity enhancement. We will be assessing Lubricant A performance at room temperature and 170°F to investigate its thermal stability and we will be evaluating its compatibility with common brines used during CT operations, especially at high concentrations of salt. We will also be comparing the performance of Lubricant A to that of a Co-polymer based Lubricant -which will be labeled Lubricanr B- in terms of Coefficient of Friction (CoF) reduction at room temperature and at 170°F. A core flood test has also been performed to investigate the impact of brines containing Lubricant A on reservoir rocks permeability. Based on our lab testing, Lubricant A manages to drop the coefficient of friction (CoF) by 60-70% in most cases and shows relatively high compatibility with different brines at different salt concentrations, outperforming Lubricant B in most cases. Lubricant A has also shown insignificant reduction in permeability during core flood tests, increasing the potential for its use in operations where formation damage might be a concern.
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