A horizontal well sand washing tool

Abstract

The invention relates to a horizontal well sand washing tool. The horizontal well sand washing tool comprises a sand washing pipe body used for being connected with a sand washing pipe column, and an installing plate arranged inside the sand washing pipe column or at the end of the sand washing pipe column. A flow guide plate is arranged at the position, in the axis direction of the sand washing pipe body, of the installing plate in a floating mode, an installing plate through flow hole is formed in the installing plate, a flow guide plate through flow hole is formed in the flow guide plate, and the installing plate through flow hole and the flow guide plate through flow hole are arranged in a staggered mode. The flow guide plate is provided with a first station enabling reversing-out fluid to burst through to allow the reversing-out fluid to pass through the installing plate, and a second station enabling the flow guide plate to fall to make contact with the installing plate after sand washing is completed to avoid sand from falling back through the installing plate through flow hole. In the sand washing process, the reversing-out fluid only needs to burst through the flow guide plate to drive the sand into the sand washing pipe body, after sand washing is completed, the sand can be taken out of a horizontal well only by lifting out the sand washing tool, and the sand in the horizontal well can be completely washed away only through low pressure of the reversing-out fluid and low displacement.

Description

technical field [0001] The invention relates to the technical field of downhole operation tools for oil field production, in particular to a horizontal well sand flushing tool. Background technique [0002] Horizontal wells can effectively increase the production of low-pressure and low-permeability tight reservoirs, and are the main well construction well types for the development of low-pressure and low-permeability tight oil and gas reservoirs. Sand production in the wellbore of the horizontal well causes the following problems: first, the horizontal section of the horizontal well is prone to sand settling, which blocks the oil and gas outflow channels, resulting in production reduction; second, the testing tool is prone to jamming and obstruction during the production profile test. Therefore, it is necessary to flush out the sand in the wellbore to ensure the normal production of the horizontal well and the implementation of the testing process. During conventional sand...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sand washing tool for horizontal wells which solves the problems in the prior art that the sand grains fall back due to the low flow rate of the returning fluid and the sand washing is not thorough.

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