Two-input control systems as an optimal means for measuring dynamic increments of drilling parameters
Measuring tools that contribute to dynamic increments allocation of drilling parameters, does not either exist or such tools have very limited application when deepening wells. In this regard, the problem of development and study of such tools becomes extremely relevant. The authors of the paper, based on many years of research, propose an analysis of two-input torque control systems. The analysis means the study of the metrological properties of two-input structures, dynamic and frequency properties. The conducted analysis will make it possible to reveal a number of properties of two-input torque control devices, characterizing this device as an optimal measurement tool. Indeed, if the conditions of pairwise equality of time constants of variational structures of channels for measuring power and the angular frequency are observed, then the measurement device as a whole degenerates into a proportional link, while maintaining the differentiation properties of the input signals of the power and angular frequency measurement channels separately. This eliminates dynamic and frequency distortions when measuring torque increments. Besides, due to the cut-off of the input signals constant component in the power and angular frequency measurement channels, the static component of the error, which is most significant in the total error of the measuring instrument, is also cut off, and the division operation at the structure output minimizes random and common-mode errors. Thus, the conducted analysis reveals the unique properties of two-input structures for monitoring and measuring torque and contributes to the recommendations for their widespread use.