Recoverable direct current method electrode installation device and segment monitoring method in long boreholes

Abstract

The invention discloses a recyclable direct current method electrode installation device in a long borehole and a segmented monitoring method. The device includes a push tube, a pole-carrying module and a multi-core cable, and the pole-carrying module includes a single-way tube, an expansion capsule, an electrode Plates, elastic centralizers, and multi-core cables are arranged in a single-way tube, and the electrode plate and multi-core cables are connected by double-core wires, and the tube is inflated to expand the capsule to achieve good coupling with the hole wall. During monitoring, the number of segments, the number of monitoring segments, and the electrode distance are determined according to the length of the borehole, and multiple electrode-carrying modules are connected to the push tube one by one, and the drilling rig is continuously pushed into the hole to push the electrodes to the target measuring point. The core cable is connected to the main unit of the electrical method, inflates the tube, turns on the electrical instrument, and collects the data of the measuring point of the target segment; then removes the air pressure in the tube, pushes the device to the position of the next measuring point, and integrates the data of each measuring point to realize Electrical monitoring of the entire section of a long borehole. The device is simple to operate and can be reused.

Description

technical field [0001] The invention relates to a direct current method integrated electrode cable installation device and a direct current method monitoring method, in particular to a recyclable direct current method electrode installation device in a long borehole and a segmented monitoring method, belonging to the technical field of engineering geophysical exploration. Background technique [0002] In recent years, with the rapid development of directional drilling technology and equipment in coal mines, long-distance long-distance drilling has achieved great success in the monitoring of water-bearing structures and gas anomalies in my country's coal mines, as well as in the prevention and control of dynamic disasters such as water inrush, rock burst, and coal and gas outbursts. widely used. The maximum distance of long-distance drilling in coal mines has reached more than 2,000 meters, and the length of long-distance drilling in mines is still increasing, providing an imp...

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Problems solved by technology

Due to the limitation of the number of electrodes and the difficulty of manual push, this type of method is difficult to apply to the DC method monitoring in long boreholes. When the borehole length exceeds 100 meters, it is difficult to push the electrodes into the borehole only by manpower; in addition , this type of method requires grouting after the electrode enters the designated position of the borehole, and the electrode cable can only be used once, resulting in a large loss of electrode cable and poor flexibility; If it is used for other purposes, one hole cannot be used for multiple purposes, and the efficiency of drilling is low.

[0006] In recent years, scholars at home and abroad have carried out research on the installation of electrodes in holes and the monitoring of direct current in holes. For example, Chinese patent CN2015861914U discloses a power supply electrode in holes for direct current in wells. The plate is retracted by overcoming the elastic force of the supporting spring, so as to realize the lifting and moving of the electrode in drilling; however, the structure of the device is complicated, and it needs to be electrified to make the electromagnet work. Good contact, more importantly, the device cannot be used in the special working environment with high explosion-proof requirements in underground coal mines; in addition, when the device is used for long-distance monitoring, the existence of the electromagnet will increase the quality of the device, which is not convenient for manual operation

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