Anti-blocking sieve tube column integrating oil collection and sand flushing

Abstract

The invention discloses an anti-blocking sieve tube column integrating oil collection and sand flushing. The column includes a coupling, a sieve tube and a sand flushing tube, the top of the sieve tube is connected with the coupling, the bottom of the sieve tube is connected with an inner blind plate and sleeved in the sand flushing tube, the blind plate at the bottom of the sieve tube is fixed tothe sand flushing tube through shearing pins, and an axial sliding mechanism is connected between the blind plate and the sand flushing tube; the lower end of the sieve tube is provided with an innersand flushing hole, a locking device is arranged at the upper end of the sand flushing tube, an outer sand flushing hole is formed in the lower end, the tube column body is pressed appropriately, andafter the shearing pins are cut off, the blind plate and the sand flushing tube move oppositely through the axial sliding mechanism; the locking device of the sand flushing tube is connected with thecoupling to tightly lock the sand flushing tube with the coupling, and the inner sand flushing hole is correspondingly communicated with the outer sand flushing hole. By adopting the anti-blocking sieve tube column, one tube can be used for two use purposes, the functions of the sieve tube is integrated with the functions of the sand flushing tube, and meanwhile, the tube column has a liquid inlet overflowing anti-blocking advantage, that is to say that when sieve holes are blocked or bonded, a normal liquid feeding and producing function of the sieve holes can be recovered in time, the maintenance-free period of an oil well is finally prolonged, and the working efficiency is further improved.

Description

technical field [0001] The invention relates to an anti-blocking screen string, in particular to an anti-blocking screen string integrating oil production and sand washing. Background technique [0002] The bottom of the tailpipe of the oil pump string (commonly known as the pipe shoe) needs to be installed with a screen. The diameter of the dense mesh on the pipe wall is generally 5 to 8 mm. The screen is used as the inlet for the well fluid in the casing to enter the pump. The main functions are: First, to filter large particles of impurities in the well fluid, such as packer rubber fragments, cement fragments, etc., to avoid foreign matter jamming pump valve failure, but it should be noted that not all oil wells have There are large particles of impurities such as packer rubber fragments and cement fragments, and there is a certain probability that foreign matter will be sucked into the pump, that is, the core function of the mesh is to guide liquid into the pump; Simple...

AI Technical Summary

Problems solved by technology

[0004] As a result, there are obvious disadvantages: First, once the mesh of the screen is blocked or smeared, the pipe string will immediately fail and lie in the well, requiring pump inspection operations to replace tools to resume normal production, resulting in a maintenance-free period for normal production of the oil well Second, the sand flushing operation requires two trips of the pipe string, resulting in a significant extension of the operation time and the high cost of the workover process

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