The Dynamic Optimization And Vibration Testing Of Sonic Drilling

In the process of oil and gas exploration, people rely mainly on indirect geophysical methods to understand the geological structure and rock properties, to search for the oil and gas resources. Due to the complex geological conditions and numerous restrictive factors, Loess Plateau Region has always been one of the emphasises and difficulties for the oil and gas exploration in China. In order to overcome these difficulties, in the process of engineering construction, people put forward higher requirements for the adaptability, reliability, portability and economy of the rig. Sonic drilling has many advantages such as high efficiency, low energy consumption, high drilling speed and adapting to a wide range of formations and so on, so it can better meet the demand of practical engineering.In this paper, by the methods of simulation and vibration testing, the author studies deeply the characteristics of the sonic drilling, there are the following several aspects:1) In this paper, the author analyzes the dynamic law of loess under the effect of sonic drilling by LS-DYNA Software. When the sonic drilling can produce the vibration frequency of 150 Hz and 110 k N load, the author finds that the drill can damage and drill into the loess.2) In this paper, the author analyzes the kinematic characteristics of the single eccentric wheel system and the crankshaft connecting rod piston system by ADAMS Simulation Software, it is concluded that the results of both simulation analysis and theoretical analysis on their kinematic characteristics are basically the same, and it is found that the crankshaft connecting rod piston system can provide much greater vibration force than the single eccentric wheel system.3) In this paper, the author analyzes and compares the design schemes of single eccentric vibrator and crankshaft piston vibrator by Axiomatic Design Theory. Finally, the author knows that the crankshaft piston vibrator is a more optimized design scheme.4) In this paper, the author acquires, processes and analyses the acceleration signal of sonic drilling by the DEWE 43-A Data Acquisition and Analysis Instruments. The author finds that the maximum acceleration of vibrator increases with the increase of rotational speed, when the vibration frequency is 150 Hz, the drill can drill into the loess.