Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 6: 158 - 164

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.06.019

Drilling & Production Engineering

Pre-injected CO2 foam fracturing technology for deep coalbed methane in the Daji Block of the Ordos Basin

  • WANG Zilin ,
  • ZHU Weiping ,
  • XU Dong ,
  • WANG Yubin ,
  • CHEN Mengqi ,
  • JIAO Han ,
  • LIU Chunaqing ,
  • HE Pengbo
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  • 1. National Engineering Research Center of Coalbed Methane Development & Utilization,Beijing 100095,China;
    2. PetroChina Coalbed Methane Company Limited,Beijing 100028,China

Received date: 2024-11-28

  Revised date: 2025-09-18

  Online published: 2025-12-31

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Abstract

To address the issues of excessive water consumption,high production decline and insufficient fracture extension during deep coalbed methane(CBM)development in the Daji Block of the Ordos Basin,a pre-CO2 foam fracturing process for CBM was developed.Through rheological analysis,foam stability evaluation fracturing fluid formulation tests,a guar-gum/polymer gel CO2 foam fracturing fluid system was established.Experiments showed that under simulated reservoir temperature and pressure,foam quality between 82% and 85% and half-life greater than 250 min achieved,which providing high foam stability,low formation damage,and strong sand-carrying capacity.Based on CO2 abilities to enhance energy and promote fracturing and to displace and desorb methane,a combined process of pre-CO2 foam energy enhancement plus high-proppant fracturing with a high sand volume guar gum/polymer system was innovatively proposed.Using a co-injected diverting sand and staged sand ramping mode,the first deep CBM pre-CO2 foam fracturing was implemented in the Jishen X-7 well in the Daji Block,which achieved a maximum sand ratio of 38%(average 28%)-a record.The results showed that this process increased daily production by 75% compared to guar-gum fracturing wells,reduced fracturing water use by 34% versus conventional wells,increased fracture network complexity by 8%,and which resulted in a stabilized post-fracturing production period with daily gas output of 7×104 m3 and stabilized casing pressure rising to over 1.2 times initial.The successes in increasing production and reducing water indicate that the pre-CO2 foam fracturing technology is a new approach for green,efficient development of deep CBM.

Key words： reservoir stimulation; foam fracturing; pre-CO2 fracturing; guar-gum fracturing; deep coalbed methane

Cite this article

WANG Zilin , ZHU Weiping , XU Dong , WANG Yubin , CHEN Mengqi , JIAO Han , LIU Chunaqing , HE Pengbo . Pre-injected CO2 foam fracturing technology for deep coalbed methane in the Daji Block of the Ordos Basin[J]. Special Oil & Gas Reservoirs, 2025 , 32(6) : 158 -164 . DOI: 10.3969/j.issn.1006-6535.2025.06.019

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