含液水平井间歇气举系统设计与运行机理模型

Daniel Croce, L. Zerpa
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引用次数: 0

摘要

在高负荷水平气井中清除滞留液仍然是一个未解决的挑战。目前水平井液化技术的可靠性和连续性有限,导致运营成本和资本支出增加,停工时间延长,设备安装增加。对水平井液化人工举升方法的实验评价表明,平均去除停滞液体积的效率为75%。实验设备包括一个实验流环,复制了含液水平井的条件,水平段为40英尺,垂直段为40英尺。该方法基于室内举升原理,在高压和低体积流量下向井的水平段间歇注入气体。通过使用糖添加剂和氯化钠来增加注入气体(压缩空气)和液体(水)之间的表面张力,去除效率提高了12%。这项工作提出了人工举升方法的机理模型,该模型基于沿系统水平和垂直段流动的气液段塞的动量平衡,包括预测液体混合物表面张力和粘度随温度和测试添加剂浓度的函数的数值回归。该模型用于确定地面所需的可用注射压力和阀芯的位置,以及估计地面设施中液体段塞的移液量、排出体积率和排出压力。根据实验流环得到的实验数据对模型进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanistic Model for the Design and Operation of an Intermittent Gas Lift System for Liquid Loaded Horizontal Gas Wells
Removing stagnant liquid in a loaded horizontal gas well remains an unsolved challenge. Current practices for horizontal well deliquification are limited in terms of reliability and continuity, resulting on increased OPEX and CAPEX, behind down time and additional equipment installation. Experimental evaluation of a proposed artificial lift method for horizontal well deliquification, showed average removal efficiencies of 75% of the stagnant liquid volume. The experimental facility consisted of an experimental flow loop, that replicates conditions of liquid-loaded horizontal wells, with a horizontal section of 40 feet and a vertical section of 40 feet. The method is based on the chamber lift principles, using intermittent injection of gas at high pressure and low volumetric flow rates to the horizontal section of the well. Removal efficiency increased by 12% by using saccharidic additives and sodium chloride, to increase the surface tension between the injected gas (compressed air) and the liquid (water). This work presents a mechanistic model of the proposed artificial lift method, based on the momentum balance of the gas and the liquid slug flowing along the horizontal and vertical sections of the system, including numerical regressions for the prediction of the surface tension and viscosity of the liquid mixture as a function of temperature and the concentration of the tested additives. The model is used to determine the required available injection pressure at surface, and the location of the valve mandrel, as same as to estimate the removed liquid volume, discharge volumetric rate, and discharge pressure of the liquid slug at the surface facilities. The model is validated against experimental data obtained from the experimental flow loop.
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