Abstract

The invention comprises a hydraulic cutting tool (24; 86), a system, a method, and also uses of the cutting tool (24; 86) and the system, for hydraulic cutting through a pipe wall (26) of a pipe body (8). For this purpose, the cutting tool (24; 86) is provided with at least one cutting section (52; 88, 90) comprising at least one fluid discharge body (54; 54´). Each such fluid discharge body (54; 54´) comprises at least two outwardly directed discharge openings (76a, 78a; 76a´, 78a´) having non-parallel discharge directions (70a, 72a; 70a´, 72a´) directed at a common intersection point (74; 74´) located outside the fluid discharge body (54; 54´). The cutting is carried out by means of an abrasive fluid (32) being supplied, via a flow-through pipe string (30), to the at least one fluid discharge body (54; 54´) from a remote location. Thereby, abrasive cutting jets (76b, 78b; 76b´, 78b´) will discharge at high velocity from the fluid discharge body (54; 54´) so as to meet and disperse in the intersection point (74; 74´), thus weakening the further cutting ability of the cutting jets (76b, 78b; 76b´, 78b´).

IPC Classes  ?

• E21B 43/114 - Perforators using direct fluid action, e.g. abrasive jets
• E21B 29/08 - Cutting or deforming pipes to control fluid flow

Abstract

A hydraulic cutting tool, a system, and a method are for hydraulic cutting through a pipe wall of a pipe body. For this purpose, the cutting tool is provided with at least one cutting section comprising at least one fluid discharge body. Each such fluid discharge body comprises at least two outwardly directed discharge openings having non-parallel discharge directions directed at a common intersection point located outside the fluid discharge body. The cutting is carried out by means of an abrasive fluid being supplied, via a flow-through pipe string, to the at least one fluid discharge body from a remote location. Thereby, abrasive cutting jets will discharge at high velocity from the fluid discharge body so as to meet and disperse in the intersection point, thus weakening the further cutting ability of the cutting jets.

IPC Classes  ?

• E21B 29/06 - Cutting windows, e.g. directional window cutters for whipstock operations
• E21B 43/114 - Perforators using direct fluid action, e.g. abrasive jets
• E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices or the like

Abstract

A method is for removing casing from a well. The method includes setting a first sealing element into fluid-sealing engagement with the inside of the casing, lowering a flow-through string into the well, a cutting tool and a second, reversibly expandable sealing element being connected to the string, forming perforations into the casing by means of said cutting tool, expanding the second, expandable sealing element into fluid-sealing engagement with the inside of the casing, passing a pressurized fluid through the string and into the annulus via the perforations, so that the viscous and/or solid mass is displaced up the annulus, cutting the casing around its entire circumference; and pulling a length of the casing up from the well.

IPC Classes  ?

• E21B 31/16 - Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
• E21B 31/03 - Freeing by flushing
• E21B 29/00 - Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windowsDeforming of pipes in boreholes or wellsReconditioning of well casings while in the ground

Abstract

A method of removing casing (3) from a well (1) is described, the method including the following steps: (A) setting a first sealing element (11) into fluid-sealing engagement with the inside of the casing (3); (B) lowering a flow-through string (9) into the well, a cutting tool (93) and a second, reversibly expandable sealing element (91) being connected to the string (9); (C) forming perforations (31) into the casing (3) by means of said cutting tool (93); (D) expanding the second, expandable sealing element (91) into fluid-sealing engagement with the inside of the casing (3); (E) passing a pressurized fluid (95) through the string (9) and into the annulus (5) via the perforations (31), so that the viscous and/or solid mass (55) is displaced up the annulus (5); (F) cutting the casing (3) around its entire circumference; and (G) pulling a length (L1) of the casing (3) up from the well (1).

IPC Classes  ?

• E21B 23/00 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
• E21B 29/00 - Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windowsDeforming of pipes in boreholes or wellsReconditioning of well casings while in the ground
• E21B 31/03 - Freeing by flushing
• E21B 43/11 - PerforatorsPermeators