Well-drilling early overflow loss ground monitoring device

Abstract

The invention relates to a well-drilling early overflow loss ground monitoring device. The well-drilling early overflow loss ground monitoring device comprises a data acquiring device, a data processor and a drill floor displayer connected with the data processor, wherein the data acquiring device is respectively connected with inlet and outlet flow sensors, a bit pressure sensor, a drill disc rotating speed sensor, a drill disc torque sensor, a mud pit liquid level sensor, a sleeve pressure sensor and a vertical pipe pressure sensor and is connected with the drill floor displayer through the data processor. The well-drilling early overflow loss ground monitoring device adopts a structure mode recognition method, automatically adjusts sensitivity, recognizes the type of well kick media, adopts pictorial chart outputting, achieves intelligentized monitoring, is high in monitoring accuracy, greatly shortens time for finding well kick, facilitates timely adoption of a well control measure, avoids safety accidents, is suitable for various well drilling working conditions, makes up the limitations of traditional monitoring methods, is simple in system structure, simple and convenient to maintain, low in monitoring cost and wide in application range and facilitates large-scale popularization.

Description

technical field [0001] The invention relates to a surface monitoring device for drilling, in particular to a surface monitoring device for early drilling overflow and leakage. Background technique [0002] At present, overflow and lost circulation are common phenomena in the drilling process. If they are not discovered in time, they may cause downhole complex situations such as well collapse and blowout, which will affect drilling efficiency and benefits in the slightest, and cause accidents in severe cases. In recent years, the number of deep and ultra-deep wells has increased, and for deep and ultra-deep wells, due to the high pressure at the bottom of the well, when a small amount of gas entering the well migrates to the wellhead, it will expand into a large amount of gas. Calculated on the basis of bottom hole pressure of 100MPa, when the overflow volume is 1m 3 When it reaches the wellhead, it becomes about 1000m 3 . However, due to a large number of uncertain factor...

AI Technical Summary

Problems solved by technology

After investigation, it is found that the most widely used monitoring methods at home and abroad in the field of overflow and leakage monitoring are the use of drilling fluid flowmeters and mud pool liquid level monitoring, and there are also monitoring through drilling geological comprehensive logging equipment, but due to many reasons for well kick There are many factors affecting monitoring, and the drilling activities are complex and changeable. Traditional monitoring methods cannot effectively deal with transient effects in unsteady conditions. The monitoring accuracy is not high and cannot be applied to various drilling conditions. Therefore, the traditional early overflow Disadvantages of the lost surface monitoring system

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