Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 4: 149 - 157

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.04.018

Drilling & Production Engineering

Numerical simulation of acidizing in fractured carbonate rocks considering temperature effects

  • YANG Junchao ,
  • CHENG Yuanfang ,
  • HAN Zhongying ,
  • HAN Songcai ,
  • YAN Chuanliang ,
  • ZHAO Zhuyu ,
  • SUN Bo
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  • 1. China University of Petroleum (East China), Qingdao, Shandong 266580, China;
    2. Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
    3. Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received date: 2024-03-11

  Revised date: 2025-05-19

  Online published: 2025-09-03

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Abstract

To address the unclear mechanism of wormhole propagation during acidizing in deep fractured carbonate rocks,an MFCAC mathematical model coupling seepage field,chemical field,and temperature field for multi-mineral component acidizing was established based on a dual-scale continuum model and discrete fracture treatment method.The mechanism of wormhole propagation and acid-etching characteristics in fractured reservoirs considering temperature effects were analyzed,and the influences of the initial content ratio of CaMg(CO3)2 to CaCO3,acid temperature,and reaction exotherm on wormhole propagation were studied.The study shows that the propagation direction of the main wormhole is mainly dominated by the control domain of nearby fractures;temperature effects increase the acid-rock reaction rate but decrease the H+ mass transfer rate,resulting in fewer natural fractures connected by the main wormhole;the increased H+ diffusion rate caused by temperature effects makes acid easier to diffuse into pores in all directions,leading to more complex wormhole morphology;the pore volume to breakthrough (PVBT) first decreases and then increases with increasing initial CaMg(CO3)2 content;when the initial content ratio of CaMg(CO3)2 to CaCO3 is 1.5,the corresponding PVBT is the smallest;PVBT increases with increasing acid temperature;compared to ignoring reaction exotherm,considering reaction exotherm results in a smaller PVBT.This research provides a theoretical basis for the precise control of dynamic wormhole propagation and optimization of operational parameters during acidizing operations in deep fractured carbonate reservoirs.

Key words： wormhole propagation; content ratio; pore volume to breakthrough (PVBT); acid temperature; reaction exotherm

Cite this article

YANG Junchao , CHENG Yuanfang , HAN Zhongying , HAN Songcai , YAN Chuanliang , ZHAO Zhuyu , SUN Bo . Numerical simulation of acidizing in fractured carbonate rocks considering temperature effects[J]. Special Oil & Gas Reservoirs, 2025 , 32(4) : 149 -157 . DOI: 10.3969/j.issn.1006-6535.2025.04.018

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