Abstract
As the core accoutrement of directional drilling construction, the measurement while drilling (MWD) device can be divided into three types due to the different data transmission methods: wired, mud pulse and electromagnetic wave. This paper used the mud pulse method to develop a mud pulse MWD device for mines, and the working principle of the mud pulse signal transmission, the signal encoding method and the structure of the device were described. Experimental research showed that the mud pulse wireless MWD device had the advantages of long transmission distance and strong working stability. At the same time, the device was not restricted by the drill pipe during operation, which could be combined with sliding orientation and rotary feed, and had great promotion and application value.
Highlights
Due to its advantages such as controllable trajectory, rotation of hole bottom, and large drilling depth, measurement while drilling (MWD) directional drilling has been used more and more widely in underground gas extraction, water control, geological structure or abnormal body exploration in domestic and foreign coal mines.As the core accoutrement for measuring while drilling in coal mines, the MWD system for mines is mainly composed of two parts, namely the hole bottom instrument and the orifice instrument
The data transmission technology in the mine MWD system refers to the data sending and receiving technology between the hole bottom instrument and the orifice instrument, which is the application foundation and key technology of the mine MWD system, and directly affects the construction personnel’s ability to timely and accurately obtain the drill bit parameters at the bottom of the hole
At present, limited by the gaps in the underground working conditions of coal mining, supporting drilling tools and technological methods, only the mud pulse MWD system that transmits data by positive pulse is adopted in mining products
Summary
Due to its advantages such as controllable trajectory, rotation of hole bottom, and large drilling depth, MWD directional drilling has been used more and more widely in underground gas extraction, water control, geological structure or abnormal body exploration in domestic and foreign coal mines. As the core accoutrement for measuring while drilling in coal mines, the MWD system for mines is mainly composed of two parts, namely the hole bottom instrument and the orifice instrument. The hole bottom instrument uses a sensor group to measure the inclination, azimuth and tool face angle and transmits the data to the orifice through the data sending module. The data transmission technology in the mine MWD system refers to the data sending and receiving technology between the hole bottom instrument and the orifice instrument, which is the application foundation and key technology of the mine MWD system, and directly affects the construction personnel’s ability to timely and accurately obtain the drill bit parameters at the bottom of the hole
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