清洁压裂液对煤微观结构及煤层气吸附的影响

Effects of clean fracturing fluids on coal microstructure and coalbed gas adsorption.

作者信息

Zhang Qian, Cai Feng, Xie Haotian, Fang Yu

机构信息

School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, 232000, China.

State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232001, China.

出版信息

Sci Rep. 2024 Sep 3;14(1):20428. doi: 10.1038/s41598-024-71371-w.

DOI:10.1038/s41598-024-71371-w

PMID:39227670

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11372046/

Abstract

Nowadays, some fracking fluids can enable resourceful extraction of coalbed methane and reduce greenhouse gas emissions. However, their toxicity or corrosiveness will cause harm to downhole workers and pollute groundwater resources. Thus, five kinds of clean composite fracturing fluids were developed in this paper by using starch solution as the matrix and adding various preparations. The change rule of methane adsorption capacity by microstructure changes of coal samples was investigated systematically, and the optimal composite fracturing fluid was determined. The results showed that the new fracturing fluid increased the degree of aromatic ring condensation by 43.3% and the average pore size by 52.1%. Also, the adsorption constants of a value decreased by 11.6% and b value decreased by 23.9%, which can remarkably reduce the methane adsorption. The experimental results provide theoretical support for the clean production of coalbed methane.

摘要

如今，一些压裂液能够实现煤层气的高效开采并减少温室气体排放。然而，它们的毒性或腐蚀性会对井下作业人员造成伤害并污染地下水资源。因此，本文以淀粉溶液为基质，添加多种制剂，研制了五种清洁复合压裂液。系统研究了煤样微观结构变化对甲烷吸附能力的变化规律，确定了最佳复合压裂液。结果表明，新型压裂液使芳香环缩合度提高了43.3%，平均孔径增大了52.1%。同时，吸附常数a值降低了11.6%，b值降低了23.9%，可显著降低甲烷吸附量。实验结果为煤层气的清洁生产提供了理论支持。