Design and Development of Multi-Parameter Long-Term Monitoring Cable Tube Structure in Underground
In order to solve the problem that only distributed optical fiber temperature sensing technology (DTS)parameter monitoring can be carried out in the current ultra-high temperature fiber optic long-term monitoring technology for offshore heavy oil thermal recovery wells, and the underground temperature and pressure data cannot be obtained at the same time, the cable tube with temperature and pressure measurement is designed. The cable tube has a three-layer pipe structure. The data of DTS and distributed acoustic sensing technology (DAS) can be collected and transmitted simultaneously in the high-temperature wellbore environment. Through mathematical simulation analysis, it is deduced that the optical cable tube can accurately measure downhole pressure data, and combined with optical fiber temperature monitoring, it can make multiple parameters centralized transmission, and the acquisition channel does not interfere with each other, so as to ensure the real-time and independent data transmission. Through the ground nitrogen transmission experiment test, the difference value of the temperature and pressure cable tube under different nitrogen flow rates is less than 0.01 MPa, which verifies that the temperature and flow rate have little influence on the pressure difference, which can ensure the overall accuracy of the test and meet the accuracy requirements of pressure measurement. The research shows that the same temperature and pressure measurement cable tube can realize the same measurement process of wellbore multiple parameters during the long-term monitoring of optical fiber in thermal production wells, and provide technical support for the long-term monitoring of wellbore multiple parameters in thermal injection wells in offshore oil fields.
万方数据
维普
