摘要
目前海上稠油热采井超高温光纤长效监测技术中,光缆管结构设计单一化,仅能开展分布式光纤温度传感技术(DTS)参数监测,而无法同时获取井下温度、压力数据.为解决此问题,设计了一种温压同测光缆管,该光缆管为3层管结构,可实现高温井筒环境内对DTS、分布式光纤声波震动传感技术(DAS)数据同时采集与传输.通过数学模拟分析,推演该光缆管可精准测取井下压力数据,并结合光纤温度监测,可使多元参数集中传输,且采集通道互不干扰,保障数据传递的实时性和独立性.通过地面氮气传输实验测试,该温压同测光缆管在不同氮气流速下,压差值均小于0.01 MPa,验证了温度、流量对压差影响较小,可以保证测试整体的精确程度,满足压力测取精度要求.研究表明,在热采井进行光纤长效监测时,温压同测光缆管可以实现井筒多元参数同测,为海上油田注热井完成井筒多元参数长效监测提供技术保障.
Abstract
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.
基金项目
中海油能源发展股份有限公司科技专项海上稠油热采提质增效技术研究课题(第一期)(十四五)(HFKJ-ZX-GJ-2023-03-02)
维普
万方数据