适合于稠油热采实验的新型数字式回压控制系统研制

DEVELOPMENT OF A NEW DIGITAL BACK PRESSURE SYSTEM SUITABLE FOR HEAVY OIL THERMAL RECOVERY EXPERIMENTS

回压系统是稠油热采实验的压力控制模块的核心系统,传统的稠油热采实验回压系统已经不能满足实验需求。研制了单膜片高灵敏度回压阀和回压系统密封材料,增设了自动控温系统。新型数字式回压系统采用随动泵控制回压元件,利用自动冷却系统对回压系统回路进行冷却,增设了人机交互界面和控制模块。设计的新型数字式回压系统能够精确控制回压系统的开启时间和范围,保证了信号采集的稳定进行,对于不同的实验需求能够进行智能控制。系统稳定性和灵敏度测试表明,新型稠油热采实验回压系统能够在450℃和50 MPa的极端环境下正常工作,且系统误差在0.05 MPa范围内,回压系统的响应灵敏度为0.5 s,新型数字式回压系统的指标性能完全满足当下稠油热采实验需要。

The back pressure system is the core system of the pressure control module of the heavy oil thermal recovery experiment.The traditional heavy oil thermal recovery experimental back pressure system cannot meet the experimental requirements.A single diaphragm high-sensitivity back pressure valve and a back pressure system sealing material have been developed,and an automatic temperature control system has been added.The new digital back pressure system uses a follow-up pump to control the back pressure components,and uses an automatic cooling system to cool the back pressure system circuit,adding a human-machine interface and control module.The designed digital back pressure system can accurately control the opening time and range of the back pressure system,ensuring stable signal acquisition and intelligent control for different experimental requirements.The system stability and sensitivity test show that the new heavy oil thermal recovery experimental back pressure system can work normally under the extreme environment of 450℃and 50 MPa,and the system error is within 0.05 MPa,and the response sensitivity of the back pressure system is 0.5 second.The index performance of the digital back pressure system fully meets the needs of current heavy oil thermal recovery experiments.