关键词: 在线液位监测, 井筒液面, 井涌, 井漏, 井控安全

Abstract: In the drilling operation, it is necessary to timely master the position and changes of the drilling fluid level in the wellbore when the ground circulation cannot be established, such as in or out drilling tools, casing running, electrical logging, etc. The traditional liquid level monitoring system in wellbore can only judge the kick or loss of drilling fluid point by point passively by setting the detection time artificially in advance, which has disadvantages such as poor timeliness and lagging detection results. SK-OLM on-line wellbore liquid level monitoring system was developed and designed for this. The system uses a nitrogen generator as the gas source of the acoustic pulse generator, which is installed at one time, and the control equipment is placed in the mud logging unit. The integration of software system and conventional mud logging system makes it a functional module of mud logging instrument. The field application test in Tarim Oilfield shows that the system can realize the real-time measurement of the changes of the liquid level in the wellbore. At the same time, through the algorithm optimization, it can realize the accurate measurement in the well opening state, achieve the purpose of timely finding the loss and overflow, and ensure safe drilling operation.

Key words: on-line liquid level monitoring, wellbore liquid level, kick, loss, well control safety