Downhole well conditioning tool

Abstract

A downhole well conditioning tool for self-stimulating a well is provided. The down hole tool is a multi-stage stacked self-exciting tool that can alter a relatively steady flow of incoming fluid into pulsating fluid streams of rapidly cycling high and low pressure without the use of moving internal parts. The downhole tool can include a first stage operative to receive a steady flow of pressurized fluid though an inlet and discharge a pulsating fluid flow and a second stage connected to the first stage and operative to receive the pulsating fluid flow from the first stage and increase the pulsations of the fluid flow before the pulsating fluid flow is discharged out of the second stage.

Description

[0001]The present invention relates to a downhole well conditioning tool for stimulating a well and more particularly to a multi-stage stacked self-exciting tool that can alter a relatively steady flow of incoming fluid into pulsating fluid streams of rapidly cycling high and low pressure without the use of moving internal parts.BACKGROUND[0002]In a typical oil and gas well, the well itself will typically have a casing inside the well bore. This casing serves to maintain the integrity of the well but it also separates the oil or gas reservoir from the inside of the well. In order to produce oil or gas from the well, the casing must be “perforated” or in other words have holes made in the casing so that oil or gas from the reservoir can flow through these perforations into the interior of the well. Typically, these perforations are made with a perforation gun which carries a number of explosive charges and is lowered down the well to the desired position before being fired off and cr...

AI Technical Summary

Benefits of technology

The well tool is a device used to improve oil recovery in wells. It can be conveyed in the well either as a drop tool and tubing string arrangement or coil tubing conveyed. The tool includes multiple stages that create pulsations in a fluid stream, which results in high velocity stresses on the well bore casing and low amplitude displacement forces in the reservoir. This dynamic state of enhanced fluid—chemical dispersion and mobilization improves productivity in the well. The well tool is easy to handle, plugs off less, and can be assembled for different well conditions. It can fit in a range of well sizes and is used in both low and high volume applications.

Problems solved by technology

However, before oil and gas can flow well through these perforations, the perforations often have to be cleaned out.

There are a number of different prior art methods for cleaning and stimulating wells, however, they often suffer from drawbacks or are not as effective as they could be.

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