油气藏评价与开发 >
2024 , Vol. 14 >Issue 3: 324 - 332
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2024.03.002
深层低渗凝析气藏气驱适应性研究
收稿日期: 2024-03-11
网络出版日期: 2024-07-10
基金资助
中国石化重点科技项目“东濮高压低渗油藏改善气驱效果关键技术”(P17003-4);中国石化重点科技项目“中原油田桥白凝析气藏注气提高采收率技术研究”(P19019-6)
Gas flooding adaptability of deep low permeability condensate gas reservoir
Received date: 2024-03-11
Online published: 2024-07-10
针对深层低渗凝析气藏由衰竭开采转变为气驱开发过程中适应性不明确的问题，综合采用PVT（地层流体高压物性）分析仪、长岩心驱替物理模拟技术和数值模拟计算方法，开展了一系列评价研究。通过对比分析注CO2、天然气（伴生气、CH4）、N2对凝析气体系高压物性影响与提高凝析油采出程度情况，明确了深层低渗凝析气藏气驱的适应性。实验结果表明：CO2在凝析油中的溶解度和溶解气油比最大，具有较强降低凝析气藏饱和压力和露点压力的特点，提高凝析油采出程度的效果最佳。同时，采用长岩心物理模拟技术针对CO2驱进行了注入时机、注入方式、注气速度优化研究，明确了在露点压力以上脉冲式注气效果更好，为注气开发技术政策及现场方案的实施提供数据支撑。
李中超 , 齐桂雪 , 罗波波 , 许寻 , 陈华 . 深层低渗凝析气藏气驱适应性研究[J]. 油气藏评价与开发, 2024 , 14(3) : 324 -332 . DOI: 10.13809/j.cnki.cn32-1825/te.2024.03.002
The transition from depletion mining to gas flooding in deep low permeability condensate gas reservoirs poses significant adaptability challenges. To address these, a series of evaluation studies were conducted using the Pressure-Volume-Temperature（PVT）analyzer, long core displacement physical simulation technology, and numerical simulation calculations. This research specifically examines the impacts of CO2 injection, natural gas（associated gas or pure CH4）, and nitrogen（N2）on the high-pressure physical properties of condensate gas systems and their potential to improve condensate oil recovery. Comparative analyses reveal that CO2, due to its high solubility and favorable gas-oil dissolution ratio in condensate oil, significantly reduces the saturation pressure and dew-point pressure of condensate gas reservoirs, thereby offering the most substantial improvement in oil recovery rates. Further optimization studies using long core physical simulation technology focused on injection timing, modes, and rates for CO2 flooding. It was determined that pulsed gas injection strategies are particularly effective when implemented above the dew-point pressure. These findings provide essential data to support the formulation of technical policies and field plans for gas injection development in such challenging reservoir conditions.
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