Autonomous operation of high efficiency ESP drive systems for improved oil recovery

该项目的目的是开发一种自主控制系统，用于海上油气开采的内部永磁（IPM）电机驱动电潜泵（ESP）系统。标准esp由低效的潜水式感应电机（IMs）驱动。因此，现有的驱动系统是在经典的IM ESP系统上开发的，并使用开环V/f控制系统进行操作。由于IPM电机控制的复杂性，现有的ESP控制方案并不适用于高效的IPM电机驱动的ESP系统。现有的井下控制和状态监测系统无法测量电潜泵电机的瞬时位置。因此，IPM技术在深海油气开采中并不可行。此外，由于气体和固体的存在，井下的状况会随着时间的推移而变化。一个IPM电机没有任何固有的阻尼能力，像一个标准的IM。因此，IPM-ESP驱动器的运行需要根据不断变化的油藏条件自动调整，以保持在安全的作业区域内，以避免故障。现有的ESP系统都是非自主的，容易因人为操作失误而发生故障。对于恶劣的海上环境，更换和/或维修ESP装置的总修井成本高达数百万美元。Avalon Controls有限公司是一家控制和仪表公司，目前正面临着变速IPM-ESP驱动自主系统开发的挑战。该项目将解决这一问题，并将为IPM-ESP驱动器开发一种智能自主系统，该系统将监测井下情况，通过使用基于无传感器转子位置估计的控制技术相应地控制ESP驱动器，并保护系统免受电机过早故障的影响。提出的自主系统将提高esp的可靠性和性能，这是在恶劣的海上环境中使用的关键要求。IPM-ESP驱动系统将是一种新的人工举升技术，将在未来几年用于纽芬兰和拉布拉多海上油气生产。**********

The purpose of this project is to develop an autonomous control system to operate an interior permanent magnet (IPM) motor driven electric submersible pump (ESP) system for offshore oil and gas recovery. Standard ESPs are driven by inefficient submersible induction motors (IMs). Thus, the existing drive systems are developed on classical IM equipped ESP systems, and operate using an open-loop V/f control system. The existing ESP control solutions are not applicable to highly efficient IPM motor driven ESP systems due to complexities associated with an IPM motor control. The available downhole control and condition monitoring systems can't measure the instantaneous position of the ESP motor. As a result, the IPM technology has not become viable for deepwater offshore oil and gas recovery. In addition, the condition of a downhole well changes over time due to the presence of gas and solids. An IPM motor does not have any inherent damping capability like a standard IM. Thus, the operation of an IPM-ESP drive needs to be adjusted automatically with changing reservoir conditions to remain within a safe operating zone for avoiding failures. The existing ESP systems are non-autonomous, and are subjected to failures due to human operator's mistakes. For a harsh offshore environment, the total intervention cost to replace and/or repair an ESP unit is millions of dollars. Avalon Controls Ltd., a control and instrumentation company, is facing challenges with the development of an autonomous system for variable speed IPM-ESP drives. This project will address this problem, and an intelligent autonomous system will be developed for IPM-ESP drives that will monitor the downhole conditions, control the ESP drive accordingly by using a sensorless rotor position estimation based control technique and protect the system from premature motor failures. The proposed autonomous system will enhance the reliability and the performance of ESPs which are critical requirements for use in harsh offshore environment. The IPM-ESP drive system will be a new artificial lift technology to be used for the Newfoundland and Labrador offshore oil and gas production in the upcoming years.**********