Immiscible CO2-Assisted Gravity Drainage Process for Enhancing Oil Recovery in Bottom Water Drive reservoir
Immiscible CO2-Assisted Gravity Drainage Process for Enhancing Oil Recovery in Bottom Water Drive reservoir
复制标题
非混相二氧化碳辅助重力排水工艺提高底水驱油藏采收率
DOI：
10.33261/jaaru.2020.27.2.007
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
M. Al
中科院分区：
文献类型：
--
作者：
Dahlia A. Al;M. Al
二氧化碳辅助重力驱油技术（GAGD）已成为通过非混相和混相模式提高二次和三次采收率（EOR）的最具影响力的方法之一。其优势在于该工艺能够提供重力稳定的驱油，从而提高石油采收率。在产层顶部放置了二氧化碳气体垂直注入器，形成气顶，将石油排放到位于油水接触面上方的水平生产油井。水平井的优势是由于钻进时间长，排水面积大，压降小。许多CO2-AGD过程的模拟和物理模型已经在油藏和环境条件下实现，以研究该方法提高石油采收率的效果，并检查控制CO2-AGD过程的大多数参数。为了提高底水驱和强水进趋势油藏的采收率，CO2-AGD工艺已被开发并进行了试验。本研究采用带底水驱动的比例原型三维模拟模型进行co2辅助重力排水。研究了CO2-AGD工艺性能。研究了底水驱对非混相CO2辅助重力驱油性能（提高采收率和含水率）的影响。通过CO2-AGD工艺实现了四种不同的语句场景。结果表明：采用CO2-AGD工艺后，最终采收率显著提高（从13.5%提高到84.3%）。采收率随着底水驱活度的增加而增加（从77.5%增加到84.3%）。此外，如果含水层活动，GAGD工艺可以提供更好的储层压力维持，将含水率保持在0%左右，直到气驱前缘到达生产井，并且在有限水驱的所有预测期内都保持在0%左右。关键词：CO2-AGD，重力排水，EOR。
The CO2-Assisted Gravity Drainage process (GAGD) has been introduced to become one of the most influential process to enhance oil recovery (EOR) methods in both secondary and tertiary recovery through immiscible and miscible mode. Its advantages came from the ability of this process to provide gravity-stable oil displacement for enhancing oil recovery. Vertical injectors for CO2 gas have been placed at the crest of the pay zone to form a gas cap which drain the oil towards the horizontal producing oil wells located above the oil-water-contact. The advantage of horizontal well is to provide big drainage area and small pressure drawdown due to the long penetration. Many simulation and physical models of CO2-AGD process have been implemented at reservoir and ambient conditions to study the effect of this method to improve oil recovery and to examine the most parameters that control the CO2-AGD process. The CO2-AGD process has been developed and tested to increase oil recovery in reservoirs with bottom water drive and strong water coning tendencies. In this study, a scaled prototype 3D simulation model with bottom water drive was used for CO2-assisted gravity drainage. The CO2-AGD process performance was studied. Also the effects of bottom water drive on the performance of immiscible CO2 assisted gravity drainage (enhanced oil recovery and water cut) was investigated. Four different statements scenarios through CO2-AGD process were implemented. Results revealed that: ultimate oil recovery factor increases considerably when implemented CO2-AGD process (from 13.5% to 84.3%). Recovery factor rises with increasing the activity of bottom water drive (from 77.5% to 84.3%). Also, GAGD process provides better reservoir pressure maintenance to keep water cut near 0% limit until gas flood front reaches the production well if the aquifer is active, and stays near 0% limit at all prediction period for limited water drive. Keywords— CO2-AGD, Gravity Drainage, EOR.