Abstract: The present invention provides a system and method for directional drilling of a borehole in a formation along a predetermined trajectory.

Abstract: The present invention provides a system and method for directional drilling of a borehole in a formation along a predetermined trajectory.

Abstract: A method of controlling the direction of drilling comprising: providing a drill bit comprising mechanical cutting means forming a bit face and a plurality of nozzles for ejecting drilling fluid arranged at different azimuthal positions with respect to the bit face, and an intermediate space between an inlet port of the drill bit and the plurality of nozzles; rotating the drill bit while passing drilling fluid comprising solids through the intermediate space and the plurality of nozzles, so as to deepen the borehole; and modifying solids concentration of drilling fluid portions flowing through the plurality of nozzles while rotating the drill bit, so that the solids concentration, for the drilling fluid portion flowing through each of the nozzles, is relatively increased when the respective nozzle is in a selected first angular sector of the borehole bottom, as compared to a second angular sector.

Abstract: A method of creating a wellbore system comprises arranging an expandable tubular element in a wellbore whereby a lower end portion of the wall of the tubular element extends radially outward and in an axially reverse direction so as to form an expanded section extending around a remaining tubular section of the tubular element, and axially extending the expanded section by moving the remaining tubular section downward relative to the expanded section so that said lower end portion of the wall bends radially outward and in an axially reverse direction, whereby an annulus is defined between said expanded and remaining tubular sections, the annulus containing a body of fluid. A volume of the fluid is replaced by pumping a replacement fluid into the annulus and discharging the volume of fluid from the annulus whereby at least one of the volume of fluid and the replacement fluid flows into the annulus.

Abstract: A method of radially expanding a tubular element in a wellbore formed in an earth formation comprises arranging the tubular element in the wellbore such that a lower end portion of the wall of the tubular element extends radially outward and in an axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, whereby an annulus is defined between said expanded and remaining tubular sections, and axially extending the expanded tubular section by moving the remaining tubular section downward relative to the expanded tubular section so that said lower end portion of the wall bends radially outward and in an axially reverse direction. A diameter of the expanded tubular section is controlled by controlling a fluid pressure in the annulus.

Abstract: A method of radially expanding a tubular element in a wellbore formed in an earth formation comprises arranging the tubular element in the wellbore such that a lower end portion of the wall of the tubular element extends radially outward and in an axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, whereby an annulus is defined between the expanded and remaining tubular sections. The expanded tubular section is axially extended by moving the remaining tubular section downward relative to the expanded tubular section so that the lower end portion of the wall bends radially outward and in an axially reverse direction, and load transfer means is positioned in the annulus, the load transfer means being arranged to transfer a load between the remaining tubular section and the expanded tubular section.

Abstract: A method of drilling into an object comprises providing a drill string in a borehole in the object, the borehole having at its bottom a borehole axis, the drill string comprising a borehole-centralized jet drill head at its lower end, the jet drill head having a drill axis, and comprising a jet nozzle; providing a stabilizer means for the drill string, the stabilizer means determining an inclination angle between the borehole axis and the drill axis; and generating a fluid jet at the jet nozzle, so as to deepen the borehole, wherein the drill string is rotated while deepening the borehole. Another system comprises a drill string with an jet drill head at its lower end, the drill head being provided with a jet nozzle, a stabilizer positioned above the jet drill head, the stabilizer contacting the borehole wall, and means for rotating the drill string.

Abstract: A method of drilling comprises providing a drill string in a borehole, the drill siring comprising an abrasive jet drill head including a jet nozzle, and providing a fluid passageway between the object's surface and the jet nozzle; supplying a fluid mixture comprising magnetic particles to the abrasive jet drill head and blasting from the nozzle an abrasive jet into impingement with the object; and modulating a jetting concentration of magnetic particles in the abrasive jet by modulating a magnetic field a first value, at which magnetic particles are collected from the fluid mixture, and a second value, at which magnetic particles are released into the fluid mixture. Further, an abrasive jet drilling assembly comprising a modulation means for modulating the concentration of the magnetic abrasive particles in the fluid jet a modulation control means for selectively changing a magnetic field between first and second values.

Abstract: A method of drilling comprises providing a drill string in a borehole, the drill string comprising an abrasive jet drill head including a jet nozzle and providing a passageway for fluid to the nozzle; supplying a supply fluid comprising a supply concentration of abrasive particles to the jet drill head; generating an jet comprising a jetting concentration of abrasive particles at the nozzle, wherein the jetting concentration depends on the supply concentration; and modulating the jetting concentration; wherein the supply concentration is modulated in order to modulate the jetting concentration. Further, an drilling assembly comprising an drill head with a jet nozzle, a passageway for fluid from a drill string to the jet nozzle, and a modulation means arranged along the fluid passageway for modulating the concentration of abrasive particles in fluid flowing through the fluid passageway towards the jet nozzle.

Abstract: A method is provided of radially expanding a tubular element. The method comprises inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded section of the tubular element extending around an unexpanded section of the tubular element, wherein said bending occurs in a bending zone of the wall, and wherein an annular space is defined between the unexpanded and expanded sections. At least one guide member is located in the annular space, each guide member being arranged to guide the wall during said bending so that the wall bends at an increased bending radius relative to bending of the wall in case the guide member is absent from the annular space.

Abstract: A method for radially expanding a tubular element in a wellbore and providing a control line that extends along the tubular element comprises (a) inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, wherein said bending occurs in a bending zone of the tubular element, (b) increasing the length of the expanded tubular section by inducing the bending zone to move in axial direction relative to the remaining tubular section, wherein said wall includes a material that is plastically deformed in the bending zone during the bending process so that the expanded tubular section retains an expanded shape as a result of said plastic deformation, and (c) extending the control line along the tubular element.

Abstract: A method is provided of radially expanding a tubular element extending into a wellbore formed in an earth formation, the method comprising inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, wherein said bending occurs in a bending zone of the tubular element, and increasing the length of the expanded tubular section by inducing the bending zone to move in axial direction relative to the remaining tubular section. One of the tubular element and the wellbore wall is provided with at least one seal member arranged to induce sealing of the expanded tubular section relative to the wellbore wall.

Abstract: A method is disclosed of radially expanding a tubular element in a wellbore formed in an earth formation. The method comprises arranging the tubular element in the wellbore whereby a lower end portion of the wall of the tubular element extends radially outward and in axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, whereby an annulus is defined between said expanded and remaining tubular sections. The expanded tubular section is axially extended by moving the remaining tubular section downward relative to the expanded tubular section so that said lower end portion of the wall bends radially outward and in axially reverse direction, and load transfer means is positioned in the annulus, the load transfer means being arranged to transfer a load between the remaining tubular section and the expanded tubular section.

Abstract: A method is disclosed of creating a wellbore system, the method comprising arranging an expandable tubular element in a wellbore formed in an earth formation whereby a lower end portion of the wall of the tubular element extends radially outward and in axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, and axially extending the expanded tubular section by moving the remaining tubular section downward relative to the expanded tubular section so that said lower end portion of the wall bends radially outward and in axially reverse direction, whereby an annulus is defined between said expanded and remaining tubular sections, the annulus containing a body of fluid.

Abstract: A method of radially expanding a tubular element in a wellbore formed in an earth formation comprises arranging the tubular element in the wellbore such that a lower end portion of the wall of the tubular element extends radially outward and in an axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, whereby an annulus is defined between said expanded and remaining tubular sections, and axially extending the expanded tubular section by moving the remaining tubular section downward relative to the expanded tubular section so that said lower end portion of the wall bends radially outward and in an axially reverse direction. A diameter of the expanded tubular section is controlled by controlling a fluid pressure in the annulus.

Abstract: A method for radially expanding a tubular element in a wellbore and providing a control line that extends along the tubular element comprises (a) inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded tubular section extending around a remaining tubular section of the tubular element, wherein said bending occurs in a bending zone of the tubular element, (b) increasing the length of the expanded tubular section by inducing the bending zone to move in axial direction relative to the remaining tubular section, wherein said wall includes a material that is plastically deformed in the bending zone during the bending process so that the expanded tubular section retains an expanded shape as a result of said plastic deformation, and (c) extending the control line along the tubular element.

Abstract: The invention relates to a method of radially expanding a tubular element. The method comprises inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded tubular section extending around an unexpanded section of the tubular element, said wall having a resistance to radially outward bending and a resistance to stretching in circumferential direction. Said wall is provided with at least one of primary means for increasing the resistance to radially outward bending of the wall, and secondary means for reducing the resistance to stretching in circumferential direction of the wall.

Abstract: A method is provided of radially expanding a tubular element. The method comprises inducing the wall of the tubular element to bend radially outward and in axially reverse direction so as to form an expanded section of the tubular element extending around an unexpanded section of the tubular element, wherein said bending occurs in a bending zone of the wall, and wherein an annular space is defined between the unexpanded and expanded sections. At least one guide member is located in the annular space, each guide member being arranged to guide the wall during said bending so that the wall bends at an increased bending radius relative to bending of the wall in case the guide member is absent from the annular space.