Process and device for pre-grouting rubber matrix to seal soft coal seam gas drainage borehole

Abstract

The invention relates to a process and device for pre-grouting rubber matrix to seal a soft coal seam gas drainage borehole. The device comprises a front section capsule, a middle section capsule and a rear section capsule which are connected in sequence. The front section capsule and the rear section capsule are communicated by a liquid filling rubber tube, and the rear section capsule is connected to a liquid filling pump by a liquid filling rubber tube. A liquid filling rubber tube is arranged on the middle section capsule, and the liquid filling rubber tube axially penetrates through the rear section capsule to be connected with the liquid filling pump. A grouting rubber tube further axially penetrates through the rear section capsule, and the liquid inlet end of the rear section capsule is connected with a grouting pump. The device is further provided with an extraction tube which sequentially and axially penetrates through the front section capsule, the middle section capsule and the rear section capsule, and the outer end of the extraction tube is connected with an extraction pipeline. The extraction tube is in sealing connection with all the capsules through sliding sealing connectors. According to the process and device, compact filling is conducted in the whole extraction process, the gas leakage phenomenon is avoided, and the sealing effect of the gas drainage borehole is effectively improved. The process and device are suitable for sealing rock drill holes and hard coal seam holes, and particularly suitable for sealing the soft coal seam gas drainage borehole, and has the advantage of being wide in application range.

Description

technical field [0001] The invention relates to a technique and a device for sealing a coal seam extraction borehole, in particular to a technique and a device for pre-injecting colloid to seal a soft coal seam extraction borehole. Background technique [0002] At present, the commonly used gas prevention and control measures mainly include ventilation and drainage, among which drainage is a fundamental measure to prevent and control gas disasters. "Coal Mine Safety Regulations" (Revised Edition in 2011), "Regulations on the Prevention and Control of Coal and Gas Outbursts", "Interim Regulations on Reaching Standards of Coal Mine Gas Drainage" and "Code for Design of Coal Mine Gas Drainage Engineering" Clearly defined. [0003] Compared with rock formations and hard coal, the poor sealing of boreholes leads to abnormally low concentration of gas extraction. Taking the Zhengzhou mining area as an example, the mining area 1 The current mining area of ​​the coal seam is exac...

AI Technical Summary

Problems solved by technology

Although high-water materials can be injected into the coal fissures around the borehole, they are prone to drying and cracking; the size of solid phase particles in the secondary sealing method is difficult to completely match the size of the fissures

Images