超高温钻孔轨迹数据记录仪研制

为了能描述钻井井眼的轨迹,使用光纤陀螺仪来测量井眼的深度、井斜角、方位角等参数。但由于光纤陀螺仪功耗高、数据实时输出,导致电池供电时续航时间不够、数据不便于传输等问题,设计了专门用于超高温钻孔轨迹测量仪的数据记录仪,该记录仪能在不超过125℃温度范围内将陀螺仪发来的轨迹数据经CRC校验后,写入到FLASH存储器中,并加上RTC时间戳,杜瓦瓶外环境温度等信息。在测量完成后,接上计算机,即可读出轨迹数据,并通过软件拟合,得到井眼的轨迹。本设计已用于青海某干热岩钻探项目,经试验证明了该设计的耐高温可靠性和数据记录的正确性。

In order to describe the trajectory of the drilling hole, the optical fiber gyroscope is used to measure the wellbore depth, well deviation angle, azimuth angle and so on. However, due to the high power consumption and real-time data output of fiber optic gyroscope, the battery power supply is not enough and the data is not easy to transmit. A data recorder specially used for ultra-high temperature drilling trajectory measuring instrument is designed. The recorder can write the track data sent by the gyroscope into the FLASH memory after being verified by CRC in the temperature range not exceeding 125℃, and add the information such as RTC time stamp, environment temperature outside the Dewar bottle and so on. After the measurement is completed, the trajectory data can be read out by connecting with the computer, and the trajectory of the wellbore can be obtained by software fitting. This design has been used in a dry hot rock drilling project in Qinghai. The high temperature reliability of the design and the correctness of data recording are proved by experiments.