【摘要】 基于连续油管的随钻测量系统采用7芯电缆作为传输媒介。井下仪器数据稳定、快速、有效传输对于随钻测量传输系统有着重要的作用。提出基于冗余结构的井下仪器互连传输总线协议。该总线协议基于CAN2.0总线协议,根据测井工程实际需要,利用FPGA实现了总线控制器,并对操作模式、错误机制和仲裁机制进行改进。该方案利用Quartus II 8.1进行仿真,通过MATLAB将该方案与CAN总线的响应时间进行比较。该系统有较好稳定性和容错性能,符合仪器的高温高压环境和长时间稳定运行性能要求,能够建立高速稳定的数据传输系统。更多还原

【Abstract】 The application of CTD(Coiled Tubing Drilling)technology uses 7-core cable as the transmission medium during drilling procedure.For ensuring the accuracy and real-time of data transmission,downhole communication system should have good stability and accuracy.A downhole component interconnect communication system with redundant structure is provided,it chooses the modified CAN protocol as the bus protocol.The system implements the bus controller based on FPGA,and improves the operation mode,error mechanism and arbitration mechanism of bus protocol.And for each module we carry on the simulation with the software Quartus II 8.1and compare the response time of CAN bus and downhole bus with software MATLAB.The system has better stability and fault tolerance performance,high temperature and high pressure environment and long time stable running performance of symbol instrument can establish a high speed and stable data transmission system.更多还原