Drilling liquid level monitor switching device and liquid level monitoring method thereof

Abstract

The invention provides a drilling liquid level monitor switching device and a liquid level monitoring method thereof. The device comprises an upper joint and a pressure-bearing stop valve, wherein thetop of the upper joint is connected with a liquid level monitor, and the bottom of the upper joint is connected with the top end of an upper end cover of the pressure-bearing stop valve; the pressure-bearing stop valve comprises the upper end cover, the bottom end of the upper end cover is connected with one end of a valve body, and the other end of the valve body is connected with a casing headpressure gauge cock valve; before liquid level monitoring, the liquid level monitor is connected with the casing head pressure gauge cock valve through the device, a pressure relief drainage hole is opened to discharge drilling fluid and shaft gas, propagation and reflection of sound waves of the liquid level monitor are prevented from being affected by air pressure and the drilling fluid in a shaft in a liquid level monitoring process, monitoring precision is prevented from being affected, and then the pressure relief exhaust vent is closed; and the pressure-bearing stop valve and the liquidlevel monitor are opened to start monitoring, and after the monitoring is finished, data are read and the monitor is closed. The drilling liquid level monitor switching device has the advantages of being simple in structure, convenient to mount and operate, safe, efficient and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling fluid level monitoring, and in particular relates to a drilling fluid level monitoring instrument switching device and a fluid level monitoring method thereof. Background technique [0002] In the process of oil drilling, the liquid level monitor can monitor the changes of drilling fluid at any time, so as to avoid the occurrence of well kick, lost circulation and blowout accidents. Changes in drilling fluid. The traditional monitoring method installs the instrument in the wellbore for monitoring, but each installation and disassembly takes a lot of time and physical energy consumption, which in turn affects the drilling time. In order to reduce the time of disassembling and assembling the instrument and the consumption of human physical energy, some manufacturers use simple joints to install the liquid level monitor on the flange of the kill manifold or choke manifold for a long time, ...

AI Technical Summary

Problems solved by technology

However, in the monitoring process of choke manifold and kill manifold, sound waves need to go through four right angles to reach the monitored liquid level, which weakens the propagation and reflection of sound waves, resulting in a decrease in monitoring accuracy, which in turn affects the drilling fluid to a large extent. The actual change situation, so the installation position of the liquid level monitor is very important

[0003] In addition to the shortcomings in the installation position of the current liquid level monitor, in the process of using the liquid level monitor to monitor the change of drilling fluid, the pressure difference between the inside and outside of the wellbore is too large and the harmful gas in the wellbore overflows, which may easily cause well control safety accidents; During each interval monitoring, it is impossible to find potential safety hazards during the unmonitored time; in addition, when the liquid level monitor is monitoring the drilling fluid, the drilling fluid may enter the liquid level monitor and cause damage to the instrument

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