3D simulation and control effect evaluation of gas extraction drilling in coal mine

To address the issure of lacking tools for three-dimensional visualization and control effect evaluation after the completion of gas extration drilling, the lack of a three-dimensional visualization and evaluation tool for the dilling effects makes it difficult to accurately identify drill blank zones accurately, thereby leaving hidden safety hazards.To address this issue, a three-dimensional simulation and evaluation technique for gas extration drilling was proposed.This technique involves importing mining engineering plans and drilling construction data to extract basic information such as roadway, drilling site, drilling, and measurement point were obtained.By interpolating the elevation values of roadway floors along guide points were interpolated and converting the two-dimensional coordinates of roadway elements into three-dimensional coordinates, a three-dimensional model reflecting the characteristics of coal seam, roadway, and drilling was constructed.The evaluation method of drilling control effect based on volumetric method was proposed.The coal seam was divided into several control volumes with side lengths equal to the effective extraction radius.The control effect of drilling was quantitatively evaluated by calculating the ratio of the sum of drilling lengths passing through the control volumes to the effective extraction radius.The drilling control effect was then displayed in three dimensions using different colors, facilitating the analysis of drilling density and the location of drilling blank zones, thus providing a basis for decision-making in accurately supplementing drillings.Based on this technology, a three-dimensional simulation and control effect evaluation system for gas extration drilling was developed and applied in 16215 working face of Jinhe Coal Mine of Yaojie Coal Power.It processed 3 786 pieces of drilling data and drew the three-dimensional models of roadway, drilling site, drilling and coal seam.The drilling three-dimensional simulation matched the field conditions.Through control effect analysis, supplementary drilling was carried out in drilling blank zones, effectively eliminating potential safety hazards.