An external clamp type lower freezing tube device for oblique freezing holes

Abstract

The invention relates to an external clamp type lower freezing tube device for oblique freezing holes, which is characterized in that it includes three parts, the first part plays the role of connection, torque transmission and sealing, and has a central tube, a torque seat, a Y-shaped seal, and a guide sleeve; The second part acts as an external clamping freezing tube, including slips, taper sleeves, springs, steel balls, connecting sleeves, key pins, and bearing seats; the third part is the oil cylinder that drives the slips to clamp, including cylinder barrels and piston rods . After the device is connected with the main shaft of the inclined well drilling rig, the freezing pipe can be clamped externally through the hydraulic system, and the inner diameter of the freezing pipe is sealed by a sealing ring, which can realize the simultaneous circulation of mud while the freezing pipe is lowered, and at the same time rotate the freezing pipe string with the rotation of the main shaft. It realizes the safe lowering of the freezing tube in the oblique freezing hole.

Description

technical field [0001] The invention belongs to the field of drilling machinery, and relates to an external clip-type lower freezing pipe device for oblique freezing holes. Background technique [0002] At present, inclined shafts are mostly used in new coal mines in western my country, and the development of inclined shafts has become a trend; for example, the main shafts of Mataihao Mine and Chahasu Mine in Inner Mongolia have been built. In the construction of inclined wellbore, due to the complex formation, it is necessary to adopt the freezing method to drill wells successively. Sinking by the freezing method is to drill dozens of evenly distributed freezing holes coaxial with the shaft around the shaft of the pre-excavated inclined shaft of the coal mine. The water in the tunnel freezes, turning the loose water-bearing rock and soil into frozen soil, increasing its strength and stability, and isolating groundwater. Under the protection of the frozen wall, excavation a...

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Problems solved by technology

According to the data, the amount of drilling engineering and the amount of cooling required for freezing are the most economical for all the inclined freezing hole schemes, the excavation amount of frozen soil is the smallest, and the cost is the least; , at present, all the straight freezing hole schemes have been used in the construction of the inclined shaft in the west of my country in the freezing method.

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