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Cable drill pipe-directional drilling-beneficial mining technology.
Release time:
2021-05-14
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Directional Drilling Technology Introduction Directional drilling is a drilling method that uses the natural bending law of the borehole or uses artificial whipping tools to extend the borehole to the intended target according to the design requirements. It can also be explained by the technology and science of drilling to reach a predetermined subsurface target and deflect the borehole in a specific direction. Directional drilling technology is one of the most advanced drilling methods in the world at present. It has GDS guiding system, which can drill to the designated position according to the pre-designed drilling trajectory through the computer monitoring outside the hole. This has an unparalleled impact on gas drainage, gas layer development, emergency rescue, detection and discharge of goaf water and geological structure.
Introduction to Directional Drilling TechnologyThe central cable drill pipe and directional drilling rig are widely used in drilling engineering, such as drilling deviation correction; Supplementary rock core; Bypass the accident hole section or complex hole section; Avoid ground obstacles; One hole has many branches; Exploration of steep ore bodies; Coal seam gas drainage or coalbed methane mining; Hydrogeology and engineering geology exploration in specific locations of mine shafts; Excavation and laying of underground pipelines, etc. But in terms of coal mine, the application in the field of gas prevention and development is also multifaceted, such as regional coal seam gas pre-drainage, tunneling pre-drainage, drainage of goaf gas, non-mining layer gas pre-drainage, not only can greatly reduce the investment cost of gas prevention and development, but also improve the drainage concentration, to provide quality assurance for the use of gas.
The central cable drill pipe is also called measuring drill pipe while drilling, which is mainly used for deep hole drilling with kilometer directional drilling machine.
The central cable drill pipe is the signal transmission device between the hole bottom inclinometer unit and the hole inclinometer equipment, and is an important supporting drilling tool to ensure the smooth implementation of directional drilling, mainly used in coal mine underground directional drilling, coal mine underground rotary drilling and other geological controlled directional drilling conditions.
The signal transmission mode of the MWD system is divided into wired (cable) and wireless. As a wired (cable) transmission mode, the central through-cable drill pipe can directly supply power to the hole bottom sensor to realize two-way communication between the hole bottom and the orifice equipment, with good real-time performance and high data transmission rate. At the same time, the central cable drill pipe solves the installation problem of the connection between the cable and the drill pipe and the connection between the cables in the past, which can effectively ensure the signal transmission of the wired (cable) measurement while drilling system.
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