A high-efficiency self-adjusting hydraulic sand washing tool for horizontal wells

Abstract

The invention discloses a high-efficiency self-adjustable hydraulic sand washing tool for a horizontal well, and belongs to the field of sand washing of horizontal wells. The high-efficiency self-adjustable hydraulic sand washing tool for the horizontal well mainly comprises a shell, an outer sliding sleeve, an inner sliding sleeve and a spin spray head, wherein the inner sliding sleeve and the outer sliding sleeve form a whole body, are arranged on the shell and can carry out certain axial sliding; the spin spray head is of a whole structure which is composed of a spin device and a nozzle; the spin device is connected to the front end of the shell; the spin spray head can be pushed to rotate by virtue of a recoil effect of nozzle jet flow; opening and closing of the nozzle on the spin spray head can be controlled by virtue of up and down sliding of the inner sliding sleeve. The high-efficiency self-adjustable hydraulic sand washing tool for the horizontal well is capable of changing the sand washing form in the well, and is simple in structure and convenient to operate; a centralizer rubs against the well wall in the process of descending a tubular column, so that the outer sliding sleeve moves upwards by a certain distance relative to the shell, and simultaneously drives the inner sliding sleeve to move upwards along the axial direction; three nozzles in the front of the spray head are open; in a similar way, the outer sliding sleeve drives the inner sliding sleeve to move downwards when the tubular column is lifted; two nozzles which incline forwards on the spray head are closed while the backward nozzles are open; therefore, the sand washing ability of the tool is greatly improved.

Description

technical field

[0001] The invention relates to a novel downhole sand washing tool for a large-displacement horizontal well, which belongs to the technical field of oil and gas well workover. Background technique

[0002] Due to loose cementation of the oil layer or unreasonable working system of the oil well, as well as improper measures, the oil well produces sand. After the oil well produces sand, if the liquid flow in the well cannot bring all the sand to the ground, the sand in the well will gradually settle, and the sand column will increase, blocking the oil production. channel, increase flow resistance, reduce production or even stop production of oil wells, and at the same time damage downhole equipment and cause downhole sand stuck accidents. Therefore, sand washing has become an indispensable process in the oil well workover stage.

[0003] At present, in the field operation of sand flushing and flushing of horizontal wells, it is generally divided into three ste...

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