Prediction method for coal and gas outburst based on comparing borehole gas flow curves

US11674381B2 · kind B2 · utility

Assignee

• CHINA COAL TECHNOLOGY & ENGINEERING GROUP SHENYANG ENGINEERING COMPANY · CN

Inventors

• Rui Zhou · 东风镇, CN
• Kaijia Zhang · 东风镇, CN
• Haisheng Qiu · 东风镇, CN
• Hongzhen Zhang · Southborough, US
• Xing Ni · 东风镇, CN
• Zhongyu Zheng · 东风镇, CN
• Zhigang Fan · Webster, US
• Shipeng Xue · 东风镇, CN
• Peng Li · Beijing, CN

Key dates

• Filing date: Mar 1, 2022
• Grant date: Jun 13, 2023
• Expiry date: Mar 1, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V99/00
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A prediction method for coal and gas outburst based on comparing borehole gas flow curves includes the following steps: constructing a seam-crossing borehole in the coal seam, measuring or calculating gas flow corresponding to critical gas pressure P, which is a reference gas flow Q(t)reference; performing linear regression on the reference gas flow Q(t)reference to form a reference flow curve; constructing a predicted seam-crossing borehole in a predicted area, and directly testing a gas flow at each time t in a delayed manner, which is a predicted gas flow Q(t)prediction; performing linear regression on the predicted gas flow Q(t)prediction to form a predicted flow curve; and judging whether the predicted flow curve is above the reference flow curve or whether the predicted flow curve intersects with the reference flow curve, and judging whether the coal seam in the predicted area has a risk of coal and gas outburst.