Well wall pipe with special concavo-convex thread and producing method thereof

Abstract

The preparation method of the plastic well wall pipe with male and female threads: the main body of the well wall pipe is extruded, the extruded pipe is cut off according to the need, and the extruded pipe blank is formed by hot pressing in the mold, and the upper and lower ends of the male thread are used. Including a complete set of outer mold and inner mold for hot-press forming; the compression of the male thread end is hot-press formed by the inner mold and the upper and lower thread complete mold; the male thread end of the pressed thread complete mold has no injection holes and vent holes; The compression of the end adopts the outer pipe mold and the inner thread extrusion die for hot extrusion molding; the outer pipe mold covers the end of the extruded pipe, and the inner wall of the extruded pipe is hot extruded with the inner thread extrusion die to form.

Description

technical field [0001] The invention relates to a borehole wall pipe. In particular, the well wall pipe with specific male and female threads and its preparation method mainly relate to water well wall pipes made of plastic used in shallow wells and deep wells. Background technique [0002] China is a water-scarce country. More than 300 cities, including Beijing and the capitals of North China, Northeast China, and Northwest China, use groundwater as the source of urban water supply. China is a large agricultural country, and agricultural water consumption accounts for more than 80% of the country. The mining and utilization of groundwater accounts for a considerable proportion of agricultural water, especially irrigation water in northern regions. Water well is an important water intake project for the development and utilization of groundwater resources, and the wall pipe of water well is the main component of well construction. It plays a huge role in the development an...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a water well wall pipe with a female-male screw connection form made of plastics used in shallow wells and deep wells, so as to overcome the problems of sand inrush in the water well, fouling of the well pipe, water quality pollution, and rot of the well pipe; For deep well pipes with a depth of 300 meters or more; at present, there is no plastic well wall pipe with a good connection method to meet this requirement. The well wall pipe proposed above cannot meet the requirements of physical strength. It is placed to the wellbore section by section, and it must also be pulled section by section to ensure the quality of the well drilling project.