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[CN 202011255244.6] System and method for identifying borehole wall condition by using axial vibration signal of air hammer
[CN 202011255244.6] A System and Method for Identifying Well Wall Condition by Using Air Hammer Axial Vibration Signal Title: A System and Method for Identifying Well Wall Condition by Using Air Hammer Axial Vibration Signal Application Number: CN 202011255244.6 Applicant: Sinopec Petroleum Engineering Technology Service Co., Ltd.; Application Date of Drilling Engineering Research Institute of Sinopec Southwest Petroleum Engineering Co., Ltd.: 2020-11-11 Patent Type: the invention relates to a system and method for identifying the condition of the well wall by using the axial vibration signal of the air hammer, installing a vibration signal collector at the top drive position of the drill string, and transmitting the collected vibration signal to the drilling monitoring room through a wireless transmission module. Firstly, the vibration sample library of the air hammer in the typical rock formation during normal drilling and the vibration sample library under abnormal conditions are established. In the process of gas drilling, the vibration signal of the drill string is collected in real time by the vibration signal collector at the top drive position, and compared with the vibration sample library, the minimum matching distance is selected by dynamic time warping algorithm, and the abnormal condition of the well wall is identified, so as to improve the safety of gas drilling. The invention has simple and reliable principle, simple operation, long-term stable work, continuous real-time monitoring, rapid, intuitive judgment results, and meets the requirements of drilling construction.
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