Pressure relief cabin, testing device for hydraulic conveying screen pipe in drill pipe and testing method

Abstract

The invention discloses a pressure relief cabin, a testing device for a hydraulic conveying screen pipe in a drill pipe and a testing method. The pressure relief cabin is provided with a tubular body, one end of the tubular body is a testing end, the other end of the tubular body is a connecting end, a force measuring end is coaxially provided with a test body and a test end cover, and pressure from the connecting end is transmitted to the test end cover through the test body for force collection. The quantitative detection problem of the conveying force of the hydraulic conveying screen pipe in a directional long drill hole in an underground coal mine is solved, reference is provided for screen pipe conveying design, and smooth implementation of screen pipe hole protection engineering practice is ensured; and the detection problem of the butt joint reliability of segmented screen pipes is solved, and optimization and improvement of a screen pipe butt joint device are facilitated.

Description

technical field [0001] The invention relates to the field of borehole protection technology for underground gas drainage in coal mines and gas control engineering, in particular to a pressure relief cabin, a hydraulic conveying screen pipe testing device and a testing method in a drill pipe. Background technique [0002] At present, the gas drainage of directional long boreholes in coal mines basically adopts the open hole completion method. As my country's coal mines are mined deeper, the geological conditions are becoming more and more complex, and the probability of drilling complex and broken strata is greatly increased. Problems such as the large loss of negative pressure along the way and the susceptibility to local hole wall collapse leading to drilling failure need to be solved. From the point of view of engineering practice, installing screen protection holes after forming holes can greatly improve the gas extraction scalar quantity and extraction time, and become an...

AI Technical Summary

Problems solved by technology

In the actual construction of this method, there are still two key problems to be solved: one is whether the conveying force during the hydraulic conveying process of the screen is sufficient, and the conveying force is too low, which may cause the screen to be stuck or even not in place; The guarantee of the success rate of pipe butt joint, the effective butt joint of each segmented screen pipe is the key to the delivery of the full hole screen pipe

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