Adaptation of Capillary String for the Surfactants Delivery into a Gas Condensate Well and Optimization of its Operation Using Dynamic Multiphase Flow Simulator

Daniil Yurievich Solovev, Anton Epryntsev, P. I. Eliseev, A. G. Yamov, Yamov Grigorievich Nerodenko, Elkin Bakirovich Guseynov, V. Bobrov
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Abstract

The studied productive formation of gas condensate field is at the stage of declining production. The inflow of bottom water due to the rise of the GWC and the design features of horizontal wells (large tubing and liner diameters) create the prerequisites for the development of a liquid loading of wells. This necessitate the optimization of the existing method of liquid unloading by dosing surfactants into the annulus. In order to increase the efficiency of well treatment with a foaming agent, the use of a surfactant injection system through a capillary string suspended inside a tubing is considered. The use of this system allows to increase the speed and depth of surfactant delivery, use the potential of the well by simultaneous work in tubing and annulus during significant watering period (water flow rate: 50 and more m3 / day), reduce reagent losses associated with retention on the casing walls, and reduce the required consumption of surfactant. The capillary string for the pumping surfactant is applicated to ensuring the stable operation of gas condensate wells during liquid loading. But today there are not ready-made applied solutions for correctly accounting surfactant action in unsteady flows conditions in the well. The paper presents the substantiation and analysis of the capillary string introduction into the well for the pumping surfactant using specialized software. In the course of work, the main analysis tool is the dynamic modeling of multiphase flows in the conditions of steady and unsteady processes in wells. This approach use is aimed at determining the optimal depth and diameter of capillary, the required consumption and concentration of surfactant, the rate of its delivery to the bottomhole, and the liquid removal efficiency from the horizontal wellbore.
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基于动态多相流模拟器的凝析气井表面活性剂输送毛细管管柱适配及操作优化
研究的凝析气田生产层正处于产量递减阶段。GWC升高引起的井底水流入以及水平井的设计特点(大油管和尾管直径)为井的液体负荷发展创造了先决条件。这就需要对现有的通过在环空中添加表面活性剂来卸液的方法进行优化。为了提高发泡剂的井处理效率,可以考虑通过悬挂在油管内的毛细管柱使用表面活性剂注入系统。使用该系统可以提高表面活性剂的输送速度和深度,在大量浇水期间(水流量:50 m3 /天以上),通过在油管和环空同时工作,利用井的潜力,减少与套管壁上滞留相关的试剂损失,并减少表面活性剂的消耗。用于泵送表面活性剂的毛细管管柱用于保证凝析气井在充液过程中的稳定运行。但目前还没有现成的实用方法来正确计算井内非稳定流动条件下表面活性剂的作用。本文利用专用软件对注入表面活性剂的毛细管管柱进行了实证分析。在工作过程中,主要的分析工具是对井中稳定和非稳定过程条件下的多相流进行动态建模。该方法的目的是确定毛管的最佳深度和直径、表面活性剂的消耗量和浓度、表面活性剂进入井底的速度以及水平井筒的液体清除效率。
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