鄂尔多斯盆地大吉区块深层煤岩气前置CO2泡沫压裂技术

王梓麟; 朱卫平; 徐栋; 王玉斌; 陈萌琦; 焦晗; 刘川庆; 何朋勃

doi:10.3969/j.issn.1006-6535.2025.06.019

特种油气藏 >

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

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

钻采工程

鄂尔多斯盆地大吉区块深层煤岩气前置CO₂泡沫压裂技术

王梓麟 ,
朱卫平 ,
徐栋 ,
王玉斌 ,
陈萌琦 ,
焦晗 ,
刘川庆 ,
何朋勃

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1.中联煤层气国家工程研究中心有限责任公司,北京 100095;
2.中国石油煤层气有限责任公司,北京 100028

王梓麟(1997—),男,工程师,2019年毕业于西南石油大学环境工程专业,2022年毕业于中国石油大学(华东)环境科学与工程专业,获硕士学位,现从事非常规油气储层改造技术研究工作。

收稿日期: 2024-11-28

修回日期: 2025-09-18

网络出版日期: 2025-12-31

基金资助

中国石油科技项目“煤岩气经济高效压裂技术与试验研究”(2023ZZ2806)

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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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摘要

鄂尔多斯盆地大吉区块深层煤岩气开发过程中存在水资源消耗巨大、产量递减率高、裂缝扩展不充分等问题。为此,开展煤岩气前置CO₂泡沫压裂工艺技术攻关,通过流变学分析、泡沫稳定性评价、压裂液配方优选等实验,构建了胍胶冻胶CO₂泡沫压裂液体系。实验表明:该压裂液体系在模拟地层温度压力下泡沫质量分数为82%～85%,半衰期超过250 min,具备高稳泡、低伤害和强携砂性能。基于CO₂具备增能促缝、置换解吸的特点,提出前置CO₂泡沫增能+胍胶冻胶高砂比减水压裂复合工艺,采用混合转向砂阶梯加砂模式,在吉深X7井完成大吉区块首次深层煤岩气前置CO₂泡沫压裂施工,实现最高砂比38%(平均为28%)的施工参数突破。试验结果表明:该工艺井较胍胶压裂井日产量提升75%,较大规模滑溜水压裂井压裂耗水量降低34%,缝网复杂度提升8%,控压稳产期日均产气量达7×10⁴ m³,稳定套压增长至1.2倍以上,提产减水降本成效显著。大吉区块前置CO₂泡沫压裂工艺技术的成功试验,为深层煤岩气绿色经济高效开发提供了新的技术思路。

关键词： 储层改造; 泡沫压裂; 前置CO₂压裂; 胍胶压裂; 深层煤岩气

本文引用格式

王梓麟 , 朱卫平 , 徐栋 , 王玉斌 , 陈萌琦 , 焦晗 , 刘川庆 , 何朋勃 . 鄂尔多斯盆地大吉区块深层煤岩气前置CO₂泡沫压裂技术[J]. 特种油气藏, 2025 , 32(6) : 158 -164 . DOI: 10.3969/j.issn.1006-6535.2025.06.019

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

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