While-drilling anti-overflow pipe liquid level monitoring device and method

Abstract

The invention provides a while-drilling anti-overflow pipe liquid level monitoring device and method. The device comprises a reflecting unit, a laser emitting unit, a laser receiving unit, a processing unit and a computing unit, wherein the reflecting unit comprises n reflecting assemblies; the laser emitting unit is installed at a first position in an anti-overflow pipe and can emit lasers to reflecting plates of the reflecting assemblies; the laser receiving unit is arranged on the upper side of the inner wall of the anti-overflow pipe and can receive lasers reflected by the reflecting plates of m reflecting assemblies, and m is less than or equal to n; the processing unit can process the lasers received by the laser receiving unit to obtain a laser incident angle; and the computing unitcan determine the liquid level or the height of deposited sediment according to the laser incident angle. The method adopts the above device to perform monitoring work. The while-drilling anti-overflow pipe liquid level monitoring device and method can have the advantages of being high in detection speed, stable in performance and precise, having more flexible application scenarios, and being capable of significantly reducing the risk of drilling fluid leakage and the risk of personal injury in restricted space.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a liquid level monitoring device and a monitoring method for an anti-overflow pipe while drilling. Background technique [0002] The change of the outlet drilling fluid flow rate during the drilling process is an important observation parameter that characterizes the flow rate, velocity and properties of the drilling fluid and downhole fluid mixture returning to the surface. If other working conditions remain unchanged and the flow rate of drilling fluid decreases, lost circulation may occur, and lost circulation is a kind of drilling fluid that is harmful, difficult to find, and difficult to determine in the drilling process in the field of petroleum engineering. Formation phenomena, while losing drilling fluid and causing economic losses, may lead to formation pollution, wellbore instability and even blowout risks; The probability of large-scale invasion, overflow, wel...

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Problems solved by technology

[0003] On-site geological and engineering personnel usually rely on the observation of the outlet flow rate to find lost circulation or drilling fluid overflow. Limited by the well site conditions and actual working conditions, the monitoring of the flow change of the drilling fluid at the surface outlet of the pipeline during the drilling process usually relies on the target type Traditional flow detectors such as flow detectors, but due to sand burial, sudden flow changes, target device design defects and other uncertain factors, flow monitoring is difficult to measure accurately, and it is necessary to introduce new methods for measuring and evaluating outlet flow while drilling Changing Situation Devices Improve Existing Measurements

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