The Design Of Logging Instrument Hardware And Communication Methods

In drilling industry,the wide application of PDC(Polycrystalline Diamond Compact Bit) bit makes rocks broken seriously,which results in the decline of correct rate of the geological logging profile and the loss of oil and gas layer.For solving the problems that application of PDC drill bits brought about,optical photonics research and development laboratory of China Ocean University designed logging prototype with the rock lithology identification rate of 95%.In this thesis,"The design of logging instrument hardware and communication methods" is the core control part of the prototype's the hardware.This thesis mainly includes two major parts:the first section describes the current status of logging technology at home and abroad,and the cutting logging instrument sets built by the project team;the second section includes the design of logging instrument and prototype testing.The prototype is composed of the camera subsystem, sample transmission subsystem and control subsystem.The second part is the author's main work,including the following:1) The sample transmission subsystem creatively uses the conveyor belt,solves the problem between the conveyor speed and CCD exposure time,coordinates with the camera sub-system,the prototype easily describes a large number of debris at the scene.2) The control subsystem with a high degree of automation accepts commands from the host computer,and coordinates the sample transmission subsystem and the camera subsystem to work.3) The system has two modes of communication:RS232,USB.In the host computer interface,we can set parameters,such as the positioning of the camera,the speed of conveyor belt,vacuum cleaner blower switch,the camera exposure,gain and so on.System communication uses multi-threaded programming techniques,CRC checksum to ensure the accuracy and real-time communication of the system.Finally,the author summarizes and analyses the tests of the logging instrument prototype,and describes the prospects in accordance with the inadequacy of the current system.