Abstract
The speed of drilling has a great relationship with the rock breaking efficiency of the bit. Based on the above background, the purpose of this article is to predict the position of shallow bit based on the vibration signal monitoring of bit broken rock. In this article, first, the mechanical research of drill string is carried out; the basic changes of the main mechanical parameters such as the axial force, torque, and bending moment of drill string are clarified; and the dynamic equilibrium equation theory of drill string system is analyzed. According to the similarity criterion, the corresponding relationship between drilling process parameters and laboratory test conditions is determined. Then, the position monitoring test system of the vibration bit is established. The acoustic emission signal and the drilling force signal of the different positions of the bit in the process of vibration rock breaking are collected synchronously by the acoustic emission sensor and the piezoelectric force sensor. Then, the denoised acoustic emission signal and drilling force signal are analyzed and processed. The mean value, variance, and mean square value of the signal are calculated in the time domain. The power spectrum of the signal is analyzed in the frequency domain. The signal is decomposed by wavelet in the time and frequency domains, and the wavelet energy coefficients of each frequency band are extracted. Through the wavelet energy coefficient calculated by the model, combined with the mean, variance, and mean square error of time-domain signal, the position of shallow buried bit can be analyzed and predicted. Finally, by fitting the results of indoor experiment and simulation experiment, it can be seen that the stress–strain curve of rock failure is basically the same, and the error is about 3.5%, which verifies the accuracy of the model.
Highlights
With the deepening of oil and gas exploration, the well depth extends from the middle shallow layer to the deep layer and ultra deep layer, and the difficulty of rock breaking increases gradually
In the deep and ultra deep well drilling, there will be a variety of deep difficult to drill strata, which put forward a great test to the existing efficient rock breaking technology
The rock breaking technology of modern drilling is developed on the basis of rotary bit and high-pressure water jet
Summary
With the deepening of oil and gas exploration, the well depth extends from the middle shallow layer to the deep layer and ultra deep layer, and the difficulty of rock breaking increases gradually. In deep and ultra deep well formation, the rock hardness is large, the drillability is extremely high, the abrasiveness is strong, the failure of rock breaking tools is fast, and the mechanical drilling speed is slow. In the deep and ultra deep well drilling, there will be a variety of deep difficult to drill strata, which put forward a great test to the existing efficient rock breaking technology. International Journal of Distributed Sensor Networks technology has very excellent drilling effect in shallow to mid deep formation, high mechanical drilling speed, less drilling accidents, and low cost. In view of the current difficulties in deep formation drilling and the actual situation of drilling rock breaking technology, it is urgent to develop new high-efficiency rock breaking technology with independent intellectual property rights
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