Junk basket with self clean assembly and methods of using same

摘要

A downhole tool for removing debris from fluid flowing through the downhole tool comprises a screen member in sliding engagement with an inner wall surface of the tool. As the screen member becomes blocked, it moves from a first or initial position to a second or actuated position which causes a pressure change detectable at the surface of the wellbore. The pressure change causes the debris blocking fluid flow through the screen member to fall off the screen member thereby allowing an increase in fluid flow through the screen member. As a result, the screen member returns to its initial position and fluid again flows through the screen member for capturing by the screen member.

主权项

1. A downhole tool for capturing debris flowing through the downhole tool, the downhole tool comprising:
a mandrel having a mandrel upper end, a mandrel lower end, a mandrel outer wall surface, a mandrel inner wall surface defining a mandrel bore, and a mandrel port disposed between the mandrel outer wall surface and the mandrel inner wall surface and in fluid communication with the mandrel bore; a partition disposed in the mandrel bore above the mandrel port, the partition dividing the mandrel bore into an upper bore and a lower bore, and having at least one partition port disposed there-through in fluid communication with the upper bore and the lower bore; a sleeve member disposed in the lower bore and operatively associated with the inner wall surface of the mandrel bore, the sleeve having a first position, a second position, a sleeve upper end, a sleeve lower end, a sleeve outer wall surface, and a sleeve inner wall surface defining a sleeve bore; and a screen member affixed to the sleeve lower end, the screen member restricting fluid flow through the sleeve bore, wherein the sleeve member moves from the first position toward the second position due to a reduction in fluid flow through the screen member.