Formation penetrating tool

Abstract

The present invention relates to a formation penetrating tool submersible into a casing in a well for hydraulically penetrating a formation and having a longitudinal tool axis, comprising a tool housing, a supply hose, slidable in the tool housing, for supplying a high pressurised fluid to a nozzle, and the tool housing having an opening through which the supply hose and the nozzle are led to penetrate the formation, wherein the formation penetrating tool further comprises a pump arranged in the tool housing, the pump being in fluid communication with the supply hose for providing a jet of fluid out of the nozzle for penetrating the formation. Furthermore, the invention relates to a downhole system comprising a formation penetrating tool according to the invention and to a method for hydraulically penetrating a formation.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a formation penetrating tool submersible into a casing in a well for hydraulically penetrating a formation and having a longitudinal tool axis, comprising a tool housing, a supply hose, slidable in the tool housing, for supplying a high pressurised fluid to a nozzle, and the tool housing having an opening through which the supply hose and the nozzle are led to penetrate the formation. Furthermore, the invention relates to a downhole system comprising a formation penetrating tool according to the invention and to a method for hydraulically penetrating a formation.BACKGROUND ART[0002]When fracturing the formation in order to provide better access to the hydrocarbon reservoir, the maximum reservoir contact is obtained if the fractures are created perpendicularly or radially from the casing or from the bore hole in a well. When fracturing, there is always a risk that the fractures are not made radially from the casing, as the ...

AI Technical Summary

Benefits of technology

[0004]The above objects, together with numerous other objects, advantages and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a formation penetrating tool submersible into a casing in a well for hydraulically penetrating a formation and having a longitudinal tool axis, comprising:

[0010]By having a pump in the tool, fluid from the well can be used as the pressurised fluid ejected through the nozzle for penetrating the formation. Thus, the pressurised fluid needs not be supplied through a long line of tubing extending from surface. This simplifies the tool as it can be submerged down the well by means of a wireline only. Not all rigs are equipped with such tubing and in these cases a special vessel needs to be ordered. Wells can always be intervened by wireline tools as wireline is always present, and thus wireline operations are quicker and less expensive. Having a pump in the tool and not at surface makes it possible to intervene by means of wireline.

[0013]Thus, the holding unit may be a force generator to prevent the hose from being forced backwards when jetting fluid for penetrating the formation.

Problems solved by technology

When fracturing, there is always a risk that the fractures are not made radially from the casing, as the formation cracks at its weakest spots.

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