Rinsing tubular column capable of cleaning forward and backward

Abstract

The invention discloses a flushing column capable of forward and reverse cleaning, which includes a body, a fixing plate and a packing plate fixed on the inner wall of the body, through holes are opened on both sides of the fixing plate, and penetrate through the middle of the fixing plate A packing column with a spring B is provided, and a lower pressing plate is fixed on the upper end of the packing column, and a circular arc surface is arranged on the upper end surface of the lower pressing plate. A baffle with a spring A is hinged to the inner wall of the lower end of the flow channel, and an annular depression matching the movable end of the baffle is provided on the circumference of the packing plate. The reverse flow path matched with the shape of the upper part; the filter screen is fixed in the middle of the lower joint, and there are two inclined first discharge holes and second discharge holes on the lower joint, the first discharge hole and the second discharge hole They are parallel to each other and located on the upper and lower sides of the filter screen respectively. The oil well is cleaned by the forward and reverse cleaning fluid to ensure the smooth progress of the oil well production.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a flushing pipe column capable of forward and reverse cleaning. Background technique [0002] When the oil well is being flushed, the kelly, drill pipe, and sleeve milling tools are generally driven by a mechanical turntable to rotate to perform sleeve grinding and milling of downhole objects, and the cuttings and iron filings produced by the sleeve milling are brought to the wellbore by the liquid circulation system In addition, the liquid circulation system has two modes: positive circulation and reverse circulation. The positive circulation is to inject the circulating fluid from the kelly, drill pipe, and sleeve milling tool, and return it through the annular space between the casing and the drill pipe; Reverse circulation is to inject the circulating fluid from the annular space between the casing and the drill pipe, and return it through the set of milling tools, drill pipe,...

AI Technical Summary

Problems solved by technology

However, the high pressure injected during reverse circulation acts on the rotary self-sealing at the wellhead. The current rotary self-sealing has low bearing pressure, poor sealing performance, and short service life. The rubber core needs to be replaced frequently, which makes its work efficiency low. When replacing the rubber core, it needs to be close Pump, prone to stuck pipe accidents

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