Coal mine underground directional drilling while-drilling water level detection device and method

Abstract

The invention discloses a coal mine underground directional drilling while-drilling water level detection device and method. The coal mine underground directional drilling while-drilling water level detection device comprises a detection device and a monitoring module used for monitoring current in a detection device loop. The detection device comprises a through cable water feeder, a through cable drill rod, an upper non-magnetic drill rod, a detection short section, a measurement short section, a lower non-magnetic drill rod, a screw motor and a drill bit which are coaxially connected in sequence; the detection short section comprises a detection short section outer pipe and a detection short section inner core, and the detection short section inner core is arranged in the detection short section outer pipe; a first through hole is formed in the pipe wall of the detection short section outer pipe in the radial direction of the detection short section outer pipe, an insulation sleeve is arranged in the first through hole, one end of the insulation sleeve extends to make contact with the outer wall of the detection short section inner core, and a flange is arranged at the other end of the insulation sleeve and arranged on the outer wall of the detection short section outer pipe, and a contact is arranged on the insulation sleeve in a nested manner. According to the detection device, a coal mine underground directional drilling tool is slightly changed, and when the water level is detected, water level detection can be achieved only by reversely inserting the quick connector of the through cable water feeder.

Description

technical field [0001] The invention belongs to the technical field of directional drilling, and in particular relates to a water level detection device and method for directional drilling in underground coal mines while drilling. Background technique [0002] my country's coal mining has been threatened by water damage for a long time, and water damage has become the second largest killer of coal mines after gas accidents, seriously restricting the safe and efficient mining of coal mines. The State Coal Mine Supervision Bureau attaches great importance to water disasters, and has formulated the sixteen-character principle of preventing and controlling coal mine water disasters: "Forecasting and forecasting, exploring in case of doubt, exploring first and then digging, treating first and then mining". The advanced detection and treatment of water hazards are important measures to prevent water disasters. The advanced exploration of hidden disaster-causing water sources in c...

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Problems solved by technology

The use of underground directional drilling in coal mines to detect water accumulation in gobs, water filling in structural zones, and water levels in aquifers has many advantages, such as high detection accuracy, long detection distance, short detection cycle, and advanced control by directional drilling. There are also some deficiencies in the application, which are mainly manifested in: at this stage, when the directional drilling technology is used to conduct advanced exploration in goafs, structural zones, aquifers and other areas that may have hidden disaster-causing water sources, when the elevation of the directional drilling hole is When the underground water level is high, the underground water will not return from the hole. At this time, to determine whether the area to be explored is water-logged, it is necessary to lift the drill and put a special instrument into the hole to detect the water level in the hole. If the groundwater in the drill hole The surrounding stratum conditions are poor, and hole collapse and shrinkage are prone to occur after the drill is lifted. It is difficult for detection instruments to be lowered into the hole to complete the water level detection, which affects the analysis and treatment effect of hidden disaster-causing water sources.

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