石油科学通报2025，Vol.10Issue(4)：747-761,15.DOI:10.3969/j.issn.2096-1693.2025.03.016
碳酸盐岩水平井连续油管酸化多尺度数值模拟与工艺优化
Multiscale modeling and optimization of coiled tubing acidizing in carbonate horizontal wells
卢盼盼 1牟建业 1成一 2罗扬 2吕骁义 3谌李楚珩1
作者信息
- 1. 中国石油大学(北京)石油工程学院,北京 102249
- 2. 振华石油控股有限公司,北京 100031
- 3. 南华大学资源与安全工程学院,衡阳 421001
- 折叠
摘要
Abstract
Coiled tubing drag acidizing is a commonly used diversion technique in carbonate reservoir horizontal wells.How-ever,due to challenges such as long wellbore length,strong formation heterogeneity,and uneven damage distribution,predicting acidizing effectiveness remains uncertain.To address this,a radial dual-scale wormhole propagation model and a numerical model of coiled tubing drag acidizing were developed to simulate the evolution of acid etching patterns and the mechanism of damage removal under varying injection parameters.Field data from the X oilfield in Iraq were integrated for process optimi-zation.Simulation results show that as the acid injection rate increases,acid etching morphologies evolve from conical pores to dominant wormholes,branched wormholes,and eventually uniform dissolution.Dominant wormholes require the least acid vol-ume and exhibit the highest propagation efficiency.Wormhole length increases significantly with acid volume intensity,extending from 0.55 m to 1.42 m as intensity increases from 0.2 to 0.8 m³/m.Greater damage depth and lower permeability contrast lead to poorer acidizing outcomes.Based on the analysis,when the damage depth is less than 0.5 m,an injection rate of 0.5 m³/min and an acid intensity of 0.3～0.4 m³/m are recommended.For damage depths around 1 m,the recommended rate is 1 m³/min with an acid intensity of 0.4～0.7 m³/m.Field results confirm that combining coiled tubing drag acidizing with near-heel pinpoint injection can enhance well productivity by 2～5 times,outperforming other acid placement strategies.This study provides theoretical and practical guidance for optimizing acidizing parameters and operational design in carbonate long horizontal wells.关键词
连续油管酸化/蚓孔形态/用酸强度/点状注酸/工艺优选Key words
coiled tubing drag acidizing/wormhole morphology/acid volume per meter/pinpoint acid injection/process optimization分类
能源科技引用本文复制引用
卢盼盼,牟建业,成一,罗扬,吕骁义,谌李楚珩..碳酸盐岩水平井连续油管酸化多尺度数值模拟与工艺优化[J].石油科学通报,2025,10(4):747-761,15.
