A wet cuttings method test system and test method for coal mine dynamic disasters

Abstract

The invention relates to a wet-type drilling cuttings method test system and test method for coal mine dynamic disasters, and belongs to the field of coal mine dynamic disaster monitoring equipment. The test system is characterized by comprising a drilling device which is used for conducting wet-type drilling on a coal bed and a solid-liquid separation device which conducts solid-liquid separation on a water-coal mixture obtained from drilling through the drilling device, wherein the solid-liquid separation device comprises a power unit and a rotating separation mechanism driven by the power unit. The test method comprises the following steps that 1, a monitoring area is selected; 2, wet-type drilling is conducted; mixture of coal dust and water is collected; 4, solid-liquid separation is conducted; 5, weighing is conducted, and the weight of coal dust is recorded; 6, data analysis is conducted. In the wet-type drilling cuttings method test system for the coal mine dynamic disasters, even if the natural moisture content of the coal bed is high, the dangerous level of the dynamic disasters of the coal bed can be identified through a drilling cuttings method, therefore, potential safety hazards are eliminated, and safety production of a coal mine is facilitated.

Description

Technical field [0001] A wet drill cuttings method testing system and testing method for coal mine dynamic disasters belongs to the field of coal mine dynamic disaster monitoring equipment. Background technique [0002] Due to its simple equipment, intuitive detection results, and easy on-site operation and discrimination, the drill cuttings method has become a more common monitoring method used at home and abroad for monitoring coal mine dynamic disasters. The basic principle of the drill cuttings method is to use a drilling rig to drill holes with a diameter of Φ42-50mm in the coal seam. According to the amount of discharged coal powder and its changing law and related dynamic effects, the identification of the risk of coal mine dynamic disasters is realized. For coal under certain conditions, under normal stress, the stress state of coal at different drilling depths is different, and the amount of pulverized coal drilled at this time is also different. When the stress concent...

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Problems solved by technology

[0003] When the drilling cuttings method is implemented, the method is greatly affected by the underground geological conditions of the coal mine. In the prior art, the drilling cuttings method adopts the dry cuttings method, that is, when the drilling machine is used to drill the coal seam, it needs to be discharged through the drill hole. The amount of dry coal powder is used to identify the risk of dynamic disasters in coal mines according to the conventional identification method. Once a certain degree of water is mixed into the coal powder, the detection of the risk of dynamic disasters in coal mines cannot be achieved by the cuttings method.

However, in reality, the natural moisture content of coal seams in many mines is relatively high. When using drilling rigs to drill holes, the coal dust often appears wet, and even water may flow out of the borehole, resulting in the failure to discharge the coal powder normally. Therefore, the drilling cuttings method cannot proceed

But in fact, there may still be high-stress areas inside the coal body, which will cause safety hazards in coal mines and is not conducive to the safe production of coal mines.

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