Overflow and well leakage monitoring system and monitoring method thereof

Abstract

The invention discloses an overflow and well leakage monitoring system and a monitoring method thereof, comprising a monitoring tank, a level meter, an adjusting valve, a check valve, a pump stroke sensor, a grouting pump, a drilling fluid pond and a monitoring control alarm device. The monitoring tank is divided by a partition into main and auxiliary chambers and is connected with a wellhead device, the grouting pump and the drilling fluid pond by being provided with the level meter and different pipe joints, the level meter, the pump stroke sensor and the adjusting valve are connected with the monitoring control alarm device which controls opening and closing of the adjusting valve and start and stop of the grouting pump and monitors in real time and warns on overflow and well leakage. In the drilling fluid cycle process in the shaft, a quick determination can be made on changes in the return flow from inside of the shaft through the speed of change of the liquid level in the auxiliary chamber; full level of the shaft is maintained constantly in the round trip process, eliminating the failure of timely grouting and full grouting; the small cross-sectional area of the monitoring tank, level detection is more flexible and accurate, and overflow and well leakage can be found more timely.

Description

technical field [0001] The invention relates to a monitoring system and a monitoring method thereof in the technical field of oil drilling monitoring systems, in particular to a monitoring system and a monitoring method for monitoring overflow and lost circulation during oil drilling. Background technique [0002] In the process of oil drilling, overflow and lost circulation will occur downhole. If the overflow and lost circulation are not discovered in time or handled properly, it is likely to develop into a blowout. The occurrence of blowout will bring huge loss of personnel and financial resources to the oil industry. At present, domestic drilling sites mainly use the method of monitoring the liquid level of the ground drilling fluid pool and the flow rate of the inlet and outlet of the wellbore to judge the occurrence of overflow or lost circulation in the wellbore. [0003] The liquid level monitoring method of the ground drilling fluid pool is to monitor the drilling ...

AI Technical Summary

Problems solved by technology

This method of monitoring the liquid level of the drilling fluid pool has great defects: first, the drilling fluid must flow from the wellhead through the overflow prevention pipe through the vibrating screen, and then return to the drilling fluid pool through the mud tank, so that the monitoring of well kick and lost circulation requires The response time is long; secondly, due to the large volume of the drilling fluid pool, the drilling fluid level changes slowly after a well kick or lost c...

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