Research And Implementation Of Key Technologies Of Three-Dimensional Acoustic Near-probe Measurement System

Energy is the lifeblood of the nation and the cornerstone of society.Oil is an important natural resource.Its main exploration and development technology has been monopolized by foreign companies.Research on logging tools with independent intellectual property rights can break the monopoly,protect the national energy security,and promote national economic development.Three-dimensional acoustic near-probe measurement system is a more advanced logging tool,which can simultaneously measure multiple azimuthal acoustic signals in the wellbore,thus providing three-dimensional geological structure information of radial,axial and circumferential formation.Compared with the conventional acoustic logging technology,the three-dimensional acoustic near-probe measurement system can use all the receivers to carry out omni-directional scanning of the underground and use the information detected through the scanning to show the imaging,which is of vital importance for the discovery of concealed reservoirs.This thesis focuses on the design of the underground control circuit and the development of operating system kernel for test equipment.The main control circuit is the core of downhole control and communication.The thesis expatiates the realization of its timing protocol,communication interface and data compression,designs an oversampling recovery module to deal with the complicated transmission environment,and proposes a simple remote download method to avoid frequent demolition of the instrument.The ground test equipment is an important verification platform for the development of the measurement system.The thesis introduces the development of embedded Linux operating system,the development of character device driver,and tracks the kernel serial code to realize the customization of baud rate.What's more,the patch of SPI master controller driver can achieve high-speed data transmission.This thesis concludes with the corresponding test process,which proves that the system can meet the requirements of the indicators.