Oil well underground forward and reverse cleaning tube column

Abstract

The invention discloses an oil well underground forward and reverse cleaning tube column. The tube column comprises a cylinder and a fixing plate and a packing plate which are fixed on the inner wall of the cylinder. Through holes are formed in the two sides of the fixing plate, a packing column with a spring B is arranged in the middle of the fixing plate in a penetrating mode, a lower compression plate is fixed at the upper end of the packing column, and a cambered face is arranged at the upper end of the lower compression plate. Forward flow channels are formed in the two ends of the packing plate, and flow blocking plates with a spring A are hinged to the inner walls of the lower ends of the forward flow channels. A circular groove matched with the moving ends of the flow blocking plates is formed in the circumference of the packing plate, and a reverse flow channel matched with the shape of the end of the packing column is formed in the middle of the packing plate. A filtering screen is fixed in the middle of a lower joint, and a first drainage hole and a second drainage hole which are inclined are formed in the lower joint and are parallel and disposed on the upper and lower sides of the filtering screen respectively. By means of the tube column, the oil well exploitation can be performed smoothly by the cleaning of the forward and reverse cleaning liquids to the oil well.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a pipe string for downhole forward and reverse cleaning of an oil production well. Background technique [0002] During the production of oil wells, because the drilling construction will produce more debris and iron filings that interfere with the extraction of oil, it is necessary to lower the pipe string for cleaning. There are two methods for casing milling operations in oil fields. One method is: the mechanical turntable drives the kelly, the drill pipe, and the casing milling tool to rotate to carry out casing grinding and milling on the downhole objects, and the cuttings and iron filings produced by casing grinding and milling are carried out of the wellbore by the liquid flow circulation system , the liquid flow circulation system has two modes: positive circulation and reverse circulation. The positive circulation is to drive the circulating fluid from the kelly, dr...

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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