摘要：Coalbed methane (CBM) is an important global energy resource. However, reservoir damage and wellbore collapse caused by water and chemical additives invasion are major obstacles that restrict the economic exploitation of CBM. Abrasive liquid nitrogen (LN2) jet assisted-drilling, a non-aqueous technique, is expected to improve drilling efficiency and simultaneously protect formations. To determine its feasibility and the effects of critical parameters, a series of laboratory experiments considering various jetting schemes were conducted. The coal-breakage mechanism was highlighted based on macro and micro analysis. Subsequently, we proposed an innovative CBM stimulation approach referred to as Radial Abrasive LN2 Jet drilling (ALN-RJD) that uses abrasive LN2 jet to drill multiple laterals radiating out from a main borehole. Then, the potential application of this method for CBM recovery enhancement in an economic feasible way was discussed using the numerical simulation and Net Present Value (NPV) method. The results show that the abrasive LN2 jet has superior coal-breakage performance attributed to four coupled effects: high-velocity jet impact, thermal shock, abrasive erosion, and gasification cracking. Moreover, the ALN-RJD can significantly increases the gas production by creating conductive pathways for gas transport in complex lateral-fracture networks. Besides, the economic analysis indicated that ALN-RJD can achieve higher NPV than those of conventional CBM development methods. The key findings of this study are expected to provide a viable alternative for the sustainable development of CBM resources in a profitable and environmentally acceptable manner.
© 2019 Elsevier Ltd

ISSN号：0306-2619

发表日期：2019-01-01

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Applied Energy

通讯作者：洪纯阳,张世昆,温海涛

第一作者：杨睿月,黄中伟,宋先知

论文类型：期刊论文

论文概要：杨睿月,洪纯阳,黄中伟,宋先知,张世昆,温海涛，Coal breakage using abrasive liquid nitrogen jet and its implications for coalbed methane recovery，Applied Energy，2019，

论文题目：Coal breakage using abrasive liquid nitrogen jet and its implications for coalbed methane recovery