注入化学剂缓解非常规井结蜡效果评价

Rafael M. D. Rosa, Arthur B. Soprana, V. Girardi, Fernando M. Villagra
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引用次数: 0

摘要

本文介绍了在非常规井中注入化学抑制剂以减少蜡沉积的数值评估。本研究的目的是通过两种不同类型的数值模拟,模拟几种操作条件下蜡的沉积,然后优化化学抑制剂的注入位置。采用瞬态一维多相流模拟器ALFAsim,并建立了专用的蜡模型,用于预测流体条件,如压力、温度、含率和流型分布,以及蜡积聚的位置和速率。1D模拟的结果随后被用作3D CFD模拟器的边界条件,目的是评估需要多长时间才能使抑制剂与流体达到满意的均匀化,以及应该安装注入器的最小深度是多少。在这项工作中,使用带有蜡沉积模型的1D多相流模拟器来识别非常规井在何种操作条件下(流速和环境温度)会开始在油管壁上出现蜡沉积。在确定了石蜡可能沉积的敏感区域后,重要的是要验证抑制剂在到达该区域时是否与流体均匀。为此,利用直接从一维模拟器获取的信息作为边界条件,进行了三维CFD仿真。CFD模型能够显示缓蚀剂与流体的混合演变,并且可以确定为保证这种均匀性,应该放置注入器的最小距离。为了验证模型的假设和准确性,研究人员选择了一口真实的井,将现场观测数据与模拟数据进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of Chemical Injection to Mitigate Wax Deposition in Unconventional Wells
This work presents a numerical assessment of chemical inhibitor injection to mitigate wax deposition in unconventional wells. The goal of this study is to simulate the deposition of wax under several operational conditions and later optimize the chemical inhibitor injection position, using two different types of numerical simulations. A transient one-dimensional multiphase flow simulator - ALFAsim, with a dedicated wax model, was used to predict flow conditions such pressure, temperature, holdup and flow pattern profiles, as well the position and rates that wax accumulates. The results from the 1D simulation were then used as boundary conditions in a 3D CFD simulator, which aimed to assess how long it would take to a satisfactory homogenization of the inhibitor with the flow and what would be the minimum depth for the injector should be installed. In this work, a 1D multiphase flow simulator with wax deposition model was used to identify on which operational conditions (flow rates and environmental temperatures) an unconventional well would start to present wax deposition on its tubing walls. After defining the susceptible region where the paraffin could deposit, it was important to verify if the inhibitor would be well homogenized with the stream when reaching this region. For that, a 3D CFD simulation was performed, using information obtained directly from the 1D simulator as boundary conditions. The CFD model was capable to show the mixing evolution of the inhibitor with the stream and it was possible to determine the minimum distance where the injector should be placed to guarantee such homogeneity. A real well was selected to provide comparisons between field observations and simulated data, in order to validate the model assumptions and accuracy.
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