A drilling module is for radial drilling in a well and an anchoring module is for use in a well tool. The drilling module has a piston for receiving a drill for the radial drilling, and for displacing the drill in a radial direction towards a wall of the well and a cylinder for receiving and guiding the piston. Both the piston and the cylinder are guide-free and of a non-circular shape, at least in a portion, to prevent relative rotation between them. The anchoring module has an extent in the axial direction of the well. The anchoring module includes a displacement device arranged to push against a portion of the wall of the well to press the anchoring module against an opposite portion of the wall of the well. The displacement device is oblong in the axial direction of the anchoring module.

A drilling module is for radial drilling in a well and an anchoring module is for use in a well tool. The drilling module has a piston for receiving a drill for the radial drilling, and for displacing the drill in a radial direction towards a wall of the well and a cylinder for receiving and guiding the piston. Both the piston and the cylinder are guide-free and of a non-circular shape, at least in a portion, to prevent relative rotation between them. The anchoring module has an extent in the axial direction of the well. The anchoring module includes a displacement device arranged to push against a portion of the wall of the well to press the anchoring module against an opposite portion of the wall of the well. The displacement device is oblong in the axial direction of the anchoring module.

A method for modifying an element on a section of wellbore tubular includes positioning a wellbore intervention tool at a first location on the tubular, operating a penetration device to remove the element and create an orifice on the section of wellbore tubular, and operating an installation device to install a replacement element in the orifice.

A multi-directional drill-type device that can be shuttled vertically through well casings of various diameters to add new perforations at the desired spacing and positions along the casings to optimize well performance is disclosed. The apparatus is especially suited to add perforations to well casings of existing vertical LFG extraction wells. The apparatus includes a motor in a housing that may be purged with inert gas and with an output shaft that rotates around a first axis. The motor output shaft drives plural drill assembly modules that have drill bits that rotate around an axis normal to the first axis and which reciprocate into and out of the apparatus.

A multi-directional drill-type device that can be shuttled vertically through well casings of various diameters to add new perforations at the desired spacing and positions along the casings to optimize well performance is disclosed. The apparatus is especially suited to add perforations to well casings of existing vertical LFG extraction wells. The apparatus includes a motor in a housing that may be purged with inert gas and with an output shaft that rotates around a first axis. The motor output shaft drives plural drill assembly modules that have drill bits that rotate around an axis normal to the first axis and which reciprocate into and out of the apparatus.

A method for lifting a first well tubular nested in a second well tubular from contact with the second well tubular includes moving a wellbore intervention tool to a location where the first well tubular is in contact with the second well tubular. The well intervention tool is operated to displace a wall of the first tubular until either (i) the wall of the first tubular contacts the second tubular and separates the first tubular from contact with the second tubular, or (ii) an opening is made in the wall of the first tubular. After the opening is made, an object is displaced from the wall of the first tubular until the object contact the second tubular and lifts the first tubular from the second tubular, wherein a circumferentially continuous annular space is opened between the first well tubular and the second well tubular.

A method includes running a wired tubing having perforating arms, a packer, and a scanner into a casing string having an annulus. A portion of the annulus that is void of cement is determined using the scanner. The packer is activated to isolate a downhole section of the casing string from an up-hole section of the casing string. A plurality of holes are punched in the up-hole section of the casing string by ejecting the perforating arms from the wired tubing. The annulus of the casing string is cemented by pumping cement through the plurality of holes into the portion of the annulus void of cement.

A method includes running a wired tubing having perforating arms, a packer, and a scanner into a casing string having an annulus. A portion of the annulus that is void of cement is determined using the scanner. The packer is activated to isolate a downhole section of the casing string from an up-hole section of the casing string. A plurality of holes are punched in the up-hole section of the casing string by ejecting the perforating arms from the wired tubing. The annulus of the casing string is cemented by pumping cement through the plurality of holes into the portion of the annulus void of cement.

A perforation cluster of a longitudinal section of a wellbore is provided. The wellbore is for hydraulic fracturing in a preferred direction of a subsurface surrounding the longitudinal section. The longitudinal section has a longitudinal axis in a longitudinal direction and defining a radial direction about the longitudinal axis. The perforation cluster includes all of the perforations of the wellbore within the longitudinal section. The perforations are separated in the longitudinal and radial directions. Two perforations are adjacent in the longitudinal direction and have a first diameter. They also have respective centers that are aligned in the preferred direction with respect to the longitudinal axis and 180° apart in the radial direction, for initiating fractures through hydraulic fracturing in the subsurface. The remaining perforations have a second diameter smaller than the first diameter.

A perforation cluster of a longitudinal section of a wellbore is provided. The wellbore is for hydraulic fracturing in a preferred direction of a subsurface surrounding the longitudinal section. The longitudinal section has a longitudinal axis in a longitudinal direction and defining a radial direction about the longitudinal axis. The perforation cluster includes all of the perforations of the wellbore within the longitudinal section. The perforations are separated in the longitudinal and radial directions. Two perforations are adjacent in the longitudinal direction and have a first diameter. They also have respective centers that are aligned in the preferred direction with respect to the longitudinal axis and 180° apart in the radial direction, for initiating fractures through hydraulic fracturing in the subsurface. The remaining perforations have a second diameter smaller than the first diameter.