Reducing flashboard assembly

Abstract

The invention discloses a reducing flashboard assembly. The reducing flashboard assembly is formed by butting two single reducing flashboards, wherein the bottom of a flashboard body in each single reducing flashboard body is provided with a guide key; top packing units are fixedly arranged on the flashboard bodies; the inner ends of the top packing units are fixed together with the outer circumferential surfaces of the reducing packing units; small semicircular gaps are formed in the middle parts of the inner end faces of the reducing packing units; large semicircular gaps are symmetrically formed in the reducing packing units above and below the small semicircular gaps; the two large semicircular gaps are provided with radial glue avoidance gaps along the circumferential direction; an iron sheet is fixedly arranged on each of the top surfaces and the bottom surfaces of the inner ends of the reducing packing units; the iron sheets cover the two large semicircular gaps; the inner ends of the iron sheets are provided with semicircular gaps; the sizes of the semicircular gaps are the same as those of the large semicircular gaps. By adopting the flashboard assembly, drill rods of different diameters within a certain size range can be sealed at high air tightness to realize reducing sealing, so that the trouble of replacing flashboards of corresponding specifications is avoided, and flashboards of various specifications do not need to be prepared for later use.

Description

technical field [0001] The invention belongs to the field of oil drilling, and in particular relates to a variable-diameter ram assembly. Background technique [0002] Suction blowout preventer is a commonly used equipment in oil drilling. It is used to seal the drill pipe to prevent the harmful gas in the well from ejecting and form a "blowout" phenomenon. The existing suction blowout preventer is a sizing blowout preventer, which cannot be changed in diameter. The reason is that the ram assembly cannot be changed in diameter. Therefore, it is necessary to replace the ram assembly of the corresponding specification when sealing drill pipes with different diameters. , the operation is complex and laborious, and it is necessary to equip ram assemblies of various sizes and specifications for backup, which will increase the cost of the equipment. Therefore, it is urgent to solve the above technical problems. Contents of the invention [0003] The technical problem to be solv...

AI Technical Summary

Problems solved by technology

The existing suction blowout preventer is a sizing blowout preventer, which cannot be changed in diameter. The reason is that the ram assembly cannot be changed in diameter. Therefore, it is necessary to replace the ram assembly of the corresponding specification when sealing drill pipes with different diameters. , the operation is complicated and laborious, and it needs to be equipped with various sizes and specifications of the gate assembly for backup, which will increase the cost of the equipment. Therefore, it is urgent to solve the above technical problems

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