An Intelligent Sand Removal Flowmeter for Boreholes

Abstract

The invention belongs to the technical field of underground drill hole hydrographic metering, and relates to an intelligent sand removal flow meter for a drill hole. A connecting pipe and a main pipe are communicated in series for forming a cruciform structure; one end of the connecting pipe is communicated with a drill hole sleeve through a first flange, and the other end of the connecting pipe is connected with a connected ordinary flow meter through a second flange; a filtering tube is arranged in an inner cavity of the lower end of the main pipe; the top surface of the filtering tube is of an inclined structure; the top of the filtering tube is provided with an inclined baffle plate; drill hole burst water is prevented from backflow; a filtering screen is arranged on the bottom and the side wall of the filtering tube; an internal hydraulic sensor is arranged at the inner side of the side wall of the filtering tube; an external hydraulic sensor is arranged at the outer side of the side wall of the filtering tube; the internal hydraulic sensor and the external hydraulic sensor are in electrical information connection with a data memory through transmission wires; and the data memory is in electrical information connection with a data control and warning system. The intelligent sand removal flow meter for the drill hole has the advantages that the structure is simple; the operation is convenient; the data measurement is precise; the maintenance cost is low; the environment is friendly; sand particles in the burst water can be blocked; and the flow rate of the drill hole burst water can also be accurately measured.

Description

Technical field: [0001] The invention belongs to the technical field of downhole borehole hydrological measurement, and relates to an intelligent sand removal flowmeter for boreholes. Background technique: [0002] In recent years, the high pressure water coal mining technology in North China type coalfields requires Austrian ash top grouting modification on the floor of the working face. The water inflow from the construction hole, inspection hole and observation hole of the working face is the most intuitive way to reveal the occurrence and migration of groundwater in the bottom plate of the working face. effect. [0003] At present, there are many methods for measuring borehole flow, such as measuring cylinder method, weir measurement method, buoy flow measurement method, magnetic induction flowmeter and ordinary flowmeter method. The borehole measuring cylinder method is helpless; the weir measurement method needs to be constructed around the borehole, and is suitable ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for measuring borehole flow, such as measuring cylinder method, weir measurement method, buoy flow measurement method, magnetic induction flowmeter and ordinary flowmeter method. The borehole measuring cylinder method is helpless; the weir measurement method needs to be constructed around the borehole, and is suitable for drilling with small water inflow; the magnetic induction flowmeter has the characteristics of accurate counting, high technical content, and high maintenance and repair costs, and is not suitable for complex underground environments; Flowmeter is the most commonly used method in downhole drilling, but drilling in high-pressure aquifers has large water volume and high water pressure, and the impact force of sediment particles in the water on gears is large, which is likely to cause gear damage and affect flowmeter readings

The reading error of the borehole flowmeter will affect the grouting project if it is light, and affect the safety of the mine if it is serious. Therefore, it is particularly important to design a flowmeter that can block the sediment particles in the gushing water and can read accurately.

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