Abstract: A method of expanding a tubular element is provided, the tubular element having a first portion to be expanded to a first inner diameter and a second portion to be expanded to a second inner diameter larger than the first inner diameter. The method comprising: a) arranging an expandable sleeve of selected wall thickness in said second tubular element portion; b) positioning an expander in the tubular element; c) operating the expander so as to expand said first tubular element portion to the first inner diameter, and operating the expander so as to expand the sleeve to an inner diameter substantially equal to the second inner diameter minus double the wall thickness of the sleeve; and d) retrieving the sleeve from the tubular element.

Abstract: A pump plug for flowline operations, which pump plug has a resilient body and a flexible cage having a wear-resistant outer surface arranged around the resilient body, wherein the flexible cage has a tube having a first end and a second end, which tube is provided with a number of slits closed at at least one end.

Abstract: An expander system for radially expanding a tubular element from a first inner diameter to a second inner diameter larger than the first inner diameter, the expander system including an expander movable between a radially retracted mode and a radially expanded mode, wherein the expander includes an expansion surface extending in axial direction of the expander and being operable to expand the tubular element upon movement of the expander from the retracted mode to the expanded mode thereof, the expansion surface being of increasing diameter in axial direction of the expander.

Abstract: An expander system for radially expanding a tubular element having an unexpanded portion of a first inner diameter, the expander system including an expander movable between a radially retracted mode and a radially expanded mode, the expander being operable to expand the tubular element from the first inner diameter to a second inner diameter larger than the first inner diameter by movement of the expander from the radially retracted mode to the radially expanded mode thereof, wherein the expander has a contact section of a diameter larger than the first inner diameter when the expander is in the radially retracted mode, and wherein the contact section is arranged to prevent axial movement of the expander through the unexpanded portion of the tubular element when the expander is in the radially retracted mode.

Abstract: An expandable tubular element for use in a wellbore formed in an earth formation, the tubular element having a first radially expandable tube and a second radially expandable tube. The tubes are arranged in a manner that an end portion of the second tube extends into an end portion of the first tube, wherein a selected one of the end portions has a reduced resistance to radial expansion per unit length compared to a remainder portion of the tube to which the selected end portion pertains.