The Drill Pipe of The Directional Drilling Measuring System While Drilling

  The signal transmission mode of the drilling measurement system is divided into wired (cable) and wireless. Through the study of various signal transmission methods, it is believed that the mud pulse, electromagnetic wave, sound wave and other linear transmission methods can not yet adapt to the construction conditions of coal mines and near-water directional holes: and the wired (cable) method has the advantages of simple structural principle, good real-time and high data transmission rate, and can directly supply power to the sensor at the bottom of the hole through the cable, realize the two-way communication between the bottom of the hole and the orifice equipment, and can meet the conditions for the construction of near-horizontal directional drilling under the coal mine. Early use of cable for drilling parameter measurement, cable is generally set outside the drill pipe, measurement needs to be drilled, through the cable will be the measurement instrument under the hole for drilling parameters side volume, so that the measurement will delay the normal drilling, can not achieve immediate measurement with drilling; Later wired transmission is carried out through the drill pipe "buried cable" method, through the special structure of the drill pipe structure to achieve the connection of the cable when adding the drill pipe, without affecting the normal drilling can achieve instant measurement with the drill. The key technology for signal transmission using the drill pipe "buried cable" method is to solve the problem of sealing and effective conduction of the drill pipe joint.
   The central cable device is composed of a one-piece drill pipe composed of a drill pipe, and the central cable device is composed of a female connector of the cable, an insulated support ring, an insulated joint, an intermediate conductor, a male connector of the cable, a reducer spring, etc.: the external of the intermediate wire is provided with an insulated joint, and its two ends are the female connector of the cable, the male connector of the cable, and the reducer spring is set on the nipple, which is connected with the female connector of the inner cone