Development of a measurement system for determining the axial impact pulse of a drill bit in the process of well drilling

RELEVANCE. The actual load on the drill bit consists of dynamic and static loads. The high degree of heterogeneity of the rock, as well as the insufficient objectivity in assessing the stress-strain state of the drilling tool, leads to the inability to determine the actual load on the bit and, consequently, to a decrease in the efficiency of well drilling. In practice, a three-axis accelerometer is installed in the telemetry system to measure the frequency of vibrations of the drill bit. However, measuring devices capable of determining the objective impact pulse are currently lacking. THE PURPOSE of this work is to develop a measurement system for determining the pulse of axial vibrations during well drilling based on the dynamics of weakly compressible fluids METHODS. This work analyzes the shortcomings of existing measurement systems used in rotary drilling of wells. A calculation formula has been obtained that correlates the pressure of the fluid in a sealed hydraulic system with the dynamics of external axial forces acting on the system. A prototype of the measurement system has been developed based on theoretically derived mathematical patterns. A program has been created for the measurement system, which implements a low-frequency filter to enhance the quality of output data, as well as a method of mutual correlation to isolate individual impacts. RESULTS. A methodology for measuring the pulse of axial impacts has been proposed based on a hydraulic cylinder installed in close proximity to the bit, along with a set of sensors to measure the state of the fluid inside the cylinder. A model of the measurement system has been developed.

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