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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第11期    总第303期    2019年11月

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文章编号:1672-7207(2019)11-2896-10
SAGD循环预热注汽参数影响规律数值模拟
李朋1,张艳玉1,孙晓飞1,刘洋2,谢孟珂1,王朝1,陈会娟3

(1. 中国石油大学(华东) 石油工程学院,山东 青岛,266580;
2. 中国石油勘探开发研究院,北京,100083;
3. 上海大学 上海市应用数学和力学研究所,上海,200072
)

摘 要: 为研究不同注汽参数条件下井筒沿程关键参数分布规律,提高蒸汽辅助重力驱油(SAGD)循环预热效果,考虑割缝筛管完井管柱结构特点,建立SAGD循环预热阶段流体在井筒和地层内的流动与传热模型,并通过全隐式离散耦合方法对模型求解。以蒸汽返回水平段跟端干度大于0为目标,分析不同注汽压力、蒸汽干度和注汽速度对井筒内蒸汽参数分布以及地层预热效果的影响,进而优化注汽参数并对预热效果进行评价。研究结果表明:长油管内蒸汽压力和温度降幅比环空内的显著,环空内蒸汽干度降幅比长油管的明显;随着注汽压力增加,井筒压力降幅减小,环空内蒸汽干度降幅增大,水平段均匀预热效果减弱;随着蒸汽干度和注汽速度增加,井筒压力降幅增大,环空内蒸汽干度降幅减弱,水平段均匀预热效果增强;减小注汽压力、增大蒸汽干度和注汽速度有利于水平段地层均匀预热。

 

关键词: 稠油;SAGD;割缝筛管;注汽参数;蒸汽参数;均匀预热

Numerical simulation of influence law of steam injection parameters in SAGD preheating stage
LI Peng1, ZHANG Yanyu1, SUN Xiaofei1, LIU Yang2, XIE Mengke1, WANG Zhao1, CHEN Huijuan3

1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
2. Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
3. Shanghai Institute of Applied Mathematics and Mechanic, Shanghai University, Shanghai 200072, China

Abstract:To study the distribution characteristics of key parameters along the wellbore under different steam injection parameters, and improve the preheating effect during the preheating stage of steam assisted gravity drainage(SAGD), a numerical model was developed to feature the fluid flow and heat transfer mechanisms in reservoir and wellbore during SAGD cyclic preheating stage in consideration of the structural characteristics of slotted screen completion string. The model was solved by fully implicit discrete coupling method. Under the premise that the steam quality was greater than 0 when the steam returned the heel point of annulus, the influences of different steam injection pressures, steam qualities and steam injection rates on the distribution of key parameters along the wellbore and formation preheating effect were analyzed. Then, the steam injection parameters were optimized and the preheating effect was evaluated. The results show that the steam pressure drop and temperature drop in long tubing are significantly higher than those in annulus, while the steam quality in annulus decreases rapidly than that in long tubing. With the increase of steam injection pressure, pressure drop decreases in wellbore, steam quality drop increases in annulus, and uniform preheating effect weakens along the horizontal wellbore. In addition, with the increase of steam quality and steam injection rate, the wellbore pressure drop increases, the drop of steam quality in annulus decreases, and the uniform preheating effect in horizontal section enhances. Moreover, reducing steam injection pressure and increasing steam quality and steam injection rate are beneficial to uniform preheating along the wellbore.

 

Key words: heavy oil; SAGD; slotted liner; steam injection parameters; steam parameters; uniform preheating

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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