一种基于STM32的嵌入式无线射孔控制系统

目前油井下页岩气勘测仍依靠传统磁性定位仪,绞车电缆连接方式作业,所采集到的井下CCL信号较不稳定,具有识别接箍信号困难的问题。为解决这一难题,设计开发一套应用于油井页岩气勘测的无线射孔系统,该套系统基于ARM Cortex M架构的微处理器STM32H735IGT6,搭建外围硬件电路实现指定功能,模拟前端板采集井下CCL信号后分别经过两级放大器,实现信号衰减和平级放大的功能,并将信号输出至无线射孔控制系统。主时钟频率为400 MHz,通用定时器每毫秒驱动16位ADC采样模拟前端信号,结合“乒乓缓存”、DMA+SPI高速缓存的方式将采样数据存储到外设FLASH芯片,并基于python设计一套上位机串口控制程序,实现对无线射孔系统的控制,包括数据处理、控制采样、射孔参数导入等功能。实际模拟测试结果表明,采样接箍信号并控制存储满足设计要求。

At present,the shale gas exploration under the oil well still relies on the traditional magnetic locator and the winch cable connection.The CCL signal collected is unstable,and it is difficult to identify the collar signal.In order to solve this problem,a wireless perforating system applied to shale gas exploration in oil Wells is designed and developed.Based on the microprocessor STM32H735IGT6 of ARM Cortex M architecture,the system builds peripheral hardware circuit to realize the specified function.After collecting downhole CCL signals from the analog front board,the system passes through two amplifiers.Realize the function of signal attenuation and amplification,and output the signal to the wireless perforating control system.The master clock frequency is 400 MHz,the universal timer drives 16-bit ADC every millisecsecond to sample analog front-end signals,and stores the sampled data to the peripheral FLASH chip by means of"Ping pong cache"and DMA+SPI cache.A set of host computer serial port control program based on python is designed to realize the control of wireless perforating system.Including data processing,control sampling,perforation parameter import and other functions.The simulation results show that sampling collar signal and control storage meet the design requirements.