Multilevel hybrid filtering circuit and method for under-well engineering parameter measurement signals

Abstract

The invention discloses a multilevel hybrid filtering circuit and method for under-well engineering parameter measurement signals. The circuit comprises an under-well measurement unit, a hybrid filtering unit, a post-processing unit and a power management unit. The under-well measurement unit is connected with the post-processing unit through the hybrid filtering unit. The power management unit is connected with the under-well measurement unit, the hybrid filtering unit and the post-processing unit. According to the multilevel hybrid filtering circuit and method for the under-well engineering parameter measurement signals provided by the invention, high frequencies and strong noises existing in weak small signals are filtered in a passive filtering mode; the signals are amplified according to certain multiples; precise band filtering is carried out through adoption of a second-order active filtering network; the signals are denoised in a passive-amplification-active hybrid filtering mode. The later signal processing, analysis and decision are carried out successfully. Compared with a general filtering mode, the circuit and the method have the advantage of improving the precision, accuracy and interference resistance of the under-well measurement data.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas drilling, and in particular relates to a multi-stage hybrid filter circuit and method for downhole engineering parameter measurement signals. Background technique [0002] In the field of petroleum drilling, intelligent drilling tools measure and process engineering parameters such as bottomhole pressure, annular pressure, drilling pressure, temperature, and torque in real time through downhole measurement units, and are used for downhole working condition analysis, tool failure analysis, and optimized drilling. tool combination to guide normal drilling. Due to the impact vibration between the drill bit and the bottom of the well, the collision between the drill string and the well wall, the existence of various drilling fluid systems and high temperature and high pressure environments during the drilling process, the collected signal amplitude is small and contains relatively la...

AI Technical Summary

Problems solved by technology

Due to the impact vibration between the drill bit and the bottom of the well, the collision between the drill string and the well wall, the existence of various drilling fluid systems and high temperature and high pressure environments during the drilling process, the collected signal amplitude is small and contains relatively large noise. And distortion, there are frame loss and unreadable problems in severe cases. Conventional passive or active filtering methods cannot guarantee better filtering effects, which brings difficulties to later signal processing, analysis and decision-making.

Images