The development of abandoned coal mine gas has multiple advantages in terms of safety, economy, environment, and society. Due to previous excavations, the gas distribution is heterogeneous, thereby hindering well location optimization. In this study, considering the Shenbei abandoned coal mine as an example, the authors developed a workflow for well location optimization through simulation. The workflow includes: (1) the setup of an initial reservoir simulation model with the preliminary well location designed by experience; (2) the optimization of the well location based on the flowline distribution, and it is preferred that the well connect a large number of flowlines; (3) the simulation based on the optimized well location, and (4) repetition of the steps until the optimized well locations are determined. Moreover, the role of fracturing is also examined through simulation scenarios. The simulation results show that the locations of the two originally designed wells (1# and 4#) should be optimized due to the relatively low gas production without fracturing. The two wells are optimized according to the flow streamlines, demonstrating performance improvement. Moreover, the simulation results also show that there is no need to optimize the well 4# location if the fracturing technology is applied. An additional well is suggested based on the flow streamline analysis and gas production performance simulation. The main conclusions drawn from this study are as follows. (1) Five optimized well locations are determined for the Shenbei abandoned coal mine, and they should be located within the “O” ring, a high permeability region nearby the previous excavation zone; (2) Fracturing is an effective method for stimulating gas production; however, the extent of fracturing varies from well to well; (3) The workflow applied in this study is effective for the well location optimization in abandoned coal mines.

开发废弃煤矿瓦斯在安全、经济、环境、社会等方面具有多重优势。由于前期开挖，气体分布不均，阻碍井位优化。在本研究中，以沉北废弃煤矿为例，作者开发了一个通过模拟优化井位的工作流程。工作流程包括：（1）根据经验设计初步井位，建立初始油藏模拟模型；(2)基于流线分布的井位优化，优先连接大量流线；(3) 基于优化井位的模拟，以及 (4) 重复步骤直到确定优化井位。而且，压裂的作用也通过模拟场景进行了检查。模拟结果表明，原设计的两口井（1#和4#）在不压裂的情况下产气量相对较低，应优化位置。两口井根据流动流线进行了优化，表现出性能改进。此外，模拟结果还表明，应用压裂技术无需优化4#井位置。根据流动流线分析和产气性能模拟，建议增加一口井。本研究得出的主要结论如下。(1) 神北废弃煤矿确定了5个优化井位，应位于前一开挖区附近的高渗透区“O”形圈内；（2）压裂是一种有效的增产措施；然而，压裂的程度因井而异；(3) 本研究采用的工作流程对废弃煤矿井位优化有效。