A method and an apparatus bend a pipe to mitigate internal wrinkling, with particular benefit when bending a lined pipe upon spooling. Bending is performed continuously by advancing the pipe through a bending zone while an internal mandrel is held at the bending zone to resist wrinkling. In one variant, the mandrel includes longitudinally-spaced pipe-engaging elements and a tensile link between the elements allows relative movement between the elements. A hold-back connection on one of the elements applies hold-back force to that element to be transmitted to the other element via the tensile link. In another variant, the mandrel includes an elongate pipe-engaging body with a hold-back connection at one end of the body. The body is flexible to bend with the pipe and is shaped to engage an inner surface of the pipe along most of the length of the body.

A process for hardening tubulars and increasing their surface area for heat transfer can be performed in place in a borehole or on the surface. A pattern is applied to an interior wall with at laser, electron beam or radiation source that is remotely controlled to apply the hardening pattern to the inside or outside wall as inert gas or clean fluid is applied. Pressure differential is applied to the wall so that the non-hardened portions or the negative of the hardened pattern plastically or elastically deform to increase surface area and enhance load resistance of tubular or sheets. Alternatively, wall differential pressure is applied with an insert having a raised pattern on its exterior surface causing the spaces where the pattern is absent to plastically deform to enhance surface area. When done in a borehole annulus pressure or stand pipe pressure is applied or a vacuum is pulled inside the tubular to generate differential pressure for hydro-forming or switching dents in an opposite stable condition. The insert can be removed mechanically, or by dissolving or disintegration. Geothermal and SAGD applications are envisioned.

A process for hardening tubulars and increasing their surface area for heat transfer can be performed in place in a borehole or on the surface. A pattern is applied to an interior wall with at laser, electron beam or radiation source that is remotely controlled to apply the hardening pattern to the inside or outside wall as inert gas or clean fluid is applied. Pressure differential is applied to the wall so that the non-hardened portions or the negative of the hardened pattern plastically or elastically deform to increase surface area and enhance load resistance of tubular or sheets. Alternatively, wall differential pressure is applied with an insert having a raised pattern on its exterior surface causing the spaces where the pattern is absent to plastically deform to enhance surface area. When done in a borehole annulus pressure or stand pipe pressure is applied or a vacuum is pulled inside the tubular to generate differential pressure for hydro-forming or switching dents in an opposite stable condition. The insert can be removed mechanically, or by dissolving or disintegration. Geothermal and SAGD applications are envisioned.

A method for manufacturing a pipe, the method comprising: a step of fastening a second mechanical quick connection member to a rectilinear hollow tubular body, a step of positioning the rectilinear hollow tubular body in a bending machine so that the angular coding mechanism of the second mechanical quick connection member is in a reference angular position with respect to said bending machine, and a step of bending the rectilinear hollow tubular body as a function of said angular reference position.

A method for manufacturing a pipe, the method comprising: a step of fastening a second mechanical quick connection member to a rectilinear hollow tubular body, a step of positioning the rectilinear hollow tubular body in a bending machine so that the angular coding mechanism of the second mechanical quick connection member is in a reference angular position with respect to said bending machine, and a step of bending the rectilinear hollow tubular body as a function of said angular reference position.

A process for hardening tubulars and increasing their surface area for heat transfer can be performed in place in a borehole or on the surface. A pattern is applied to an interior wall with at laser, electron beam or radiation source that is remotely controlled to apply the hardening pattern to the inside or outside wall as inert gas or clean fluid is applied. Pressure differential is applied to the wall so that the non-hardened portions or the negative of the hardened pattern plastically or elastically deform to increase surface area and enhance load resistance of tubular or sheets. Alternatively, wall differential pressure is applied with an insert having a raised pattern on its exterior surface causing the spaces where the pattern is absent to plastically deform to enhance surface area. When done in a borehole annulus pressure or stand pipe pressure is applied or a vacuum is pulled inside the tubular to generate differential pressure for hydro-forming or switching dents in an opposite stable condition. The insert can be removed mechanically, or by dissolving or disintegration. Geothermal and SAGD applications are envisioned.

A process for hardening tubulars and increasing their surface area for heat transfer can be performed in place in a borehole or on the surface. A pattern is applied to an interior wall with at laser, electron beam or radiation source that is remotely controlled to apply the hardening pattern to the inside or outside wall as inert gas or clean fluid is applied. Pressure differential is applied to the wall so that the non-hardened portions or the negative of the hardened pattern plastically or elastically deform to increase surface area and enhance load resistance of tubular or sheets. Alternatively, wall differential pressure is applied with an insert having a raised pattern on its exterior surface causing the spaces where the pattern is absent to plastically deform to enhance surface area. When done in a borehole annulus pressure or stand pipe pressure is applied or a vacuum is pulled inside the tubular to generate differential pressure for hydro-forming or switching dents in an opposite stable condition. The insert can be removed mechanically, or by dissolving or disintegration. Geothermal and SAGD applications are envisioned.

A hole-coldworking apparatus has a seamless sleeve and a mandrel which have complementary taper angles. The apparatus has a spindle assembly with a fixed section and a translating section. The fixed section is rotated by a motor and in turn rotates the translating section, the spindle, and the sleeve. The translating section is moved by an actuator to extend and retract the mandrel relative to the axially fixed section and the sleeve. The complementary tapers for the sleeve and mandrel radially expand a hole's diameter when the seamless sleeve is within the hole and the mandrel is retracted into the hole and presses against the seamless sleeve. When the mandrel is extended so that it is not in contact with the seamless sleeve, the mandrel and the seamless sleeve are rotated to assist in the insertion and the removal of the seamless sleeve in the hole.

A hole-coldworking apparatus has a seamless sleeve and a mandrel which have complementary taper angles. The apparatus has a spindle assembly with a fixed section and a translating section. The fixed section is rotated by a motor and in turn rotates the translating section, the spindle, and the sleeve. The translating section is moved by an actuator to extend and retract the mandrel relative to the axially fixed section and the sleeve. The complementary tapers for the sleeve and mandrel radially expand a hole's diameter when the seamless sleeve is within the hole and the mandrel is retracted into the hole and presses against the seamless sleeve. When the mandrel is extended so that it is not in contact with the seamless sleeve, the mandrel and the seamless sleeve are rotated to assist in the insertion and the removal of the seamless sleeve in the hole.