低浸透性炭層におけるガス抽出のためのCO₂相変化破砕のメカニズムと現場適用
Mechanism and field application of CO₂ phase‑change fracturing for gas extraction in low‑permeability coal seams (原題)
Chuan Deng, Peng Li, Changsheng Zheng, Mengtang Xu
🤖 gxceed AI 要約
日本語
貴州省の高ガス・低浸透性炭層を対象に、液体CO₂相変化破砕による浸透性改善メカニズムと現場性能を検証した研究。1.4kgの液体CO₂がTNT243g相当の相転移エネルギーを放出し、破砕後10〜30日で有効ガス drainage半径が1.9〜2.5倍に拡大した。瀝青炭は無煙炭より圧力解放・浸透性改善効果が高く、石炭ランク依存の差異メカニズムを明らかにした。
English
This study examines liquid CO2 phase-change fracturing to enhance permeability and gas extraction in high-gas, low-permeability coal seams in Guizhou. 1.4 kg of liquid CO2 releases energy equivalent to 243 g TNT, and the effective drainage radius expands 1.9-2.5x within 10-30 days. Bituminous coal outperforms anthracite, revealing a coal-rank-dependent response mechanism.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
石炭由来メタン回収は日本のGX文脈では限定的だが、CO₂の産業利用（CCU）と炭鉱ガス制御の工学的知見として、資源開発・炭素利用技術に関心のある読者に参考となる。
In the global GX context
While coalbed methane extraction sits at the margins of global decarbonization disclosure, the paper contributes to the CCUS/CCU engineering literature by demonstrating CO2 utilization for enhanced gas recovery, relevant to transition-technology assessments in coal-dependent economies.
👥 読者別の含意
🔬研究者:CO2相変化破砕の石炭ランク依存メカニズムと現場データを提供する。
🏢実務担当者:低浸透性炭層でのガス回収効率改善の施工パラメータ検討に資する。
🏛政策担当者:炭鉱ガス安全対策とCO2利用技術の政策設計に参考情報を提供する。
📄 Abstract（原文）
To address the inefficient gas extraction problem of high‑gas low‑permeability coal seams in Guizhou Province, this study investigates the permeability‑enhancing mechanism and field performance of liquid CO₂ phase‑change fracturing, taking local anthracite and bituminous coal as research objects. Relying on the special thermophysical properties of liquid CO₂, phase‑change shock loading creates multi‑zone fracturing in coal mass; meanwhile, CO₂ can displace adsorbed methane to improve seam permeability. Energy equivalence calculation indicates that 1.4 kg liquid CO₂ releases phase‑transition energy equivalent to 243 g TNT, proving good safety and controllability of this technology. Field tests show that gas production of fractured boreholes follows negative‑exponential attenuation with fitting R² of 0.85‑0.99. The effective gas drainage radius expands rapidly within 10‑30 days after fracturing and finally increases by 1.9‑2.5 times compared with original coal seams. Under consistent fracturing construction parameters, despite inherent disparities in baseline geological properties between the two test coal seams, bituminous coal achieves better pressure‑relief and permeability‑enhancement performance than anthracite. Further analysis reveals the coal‑rank‑dependent differential response mechanism: dense‑matrix anthracite dissipates most impact energy near boreholes and limits fracture propagation, whereas well‑cleated bituminous coal develops long‑range connected fracture networks for efficient gas seepage. This study clarifies the lithology‑controlled differential mechanism of liquid CO₂ phase‑change fracturing and forms targeted gas‑control technology for Guizhou coal mines. The findings provide theoretical support and engineering references for efficient coalbed methane exploitation in high‑gas low‑permeability coal seams of Southwest China.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1038/s41598-026-76228-yfirst seen 2026-10-16 05:10:37
🔔 こうした論文の新着を逃したくない方は キーワードアラート に登録（無料・3キーワードまで）。
gxceed は公開メタデータに基づく研究支援データセットです。要約・翻訳・解説は AI 支援で生成されています。 最終的な解釈・検証は利用者が原典資料に基づいて行うことを前提とします。