Perforating tool with a hydraulically actuated assembly

A bottom hole assembly to form perforations, comprising:

• a top subassembly configured to couple to a downhole conveyance that is extendable from a terranean surface, through a wellbore, and to a subterranean formation;
• an abrasive jet perforating tool configured to couple to the downhole conveyance and inject abrasive particles along a radial direction to create perforations in the subterranean formation;
• a telescopic jet nozzle attached to the abrasive jet perforating tool and configured to direct the abrasive particles out of the abrasive jet perforating tool, the telescopic jet nozzle configured to perform a first blasting to create an initial hole in the subterranean formation, and the telescopic jet nozzle configured to move towards and away from the initial hole along the radial direction and perform a second blasting to form a perforation;
• and
• a hydraulically actuated subassembly attached to the abrasive jet perforating tool and configured to move the abrasive jet perforating tool towards and retract the abrasive jet perforating tool away from the subterranean formation along the radial direction, wherein the hydraulically actuated subassembly comprises at least one cylinder attached to the abrasive jet perforating tool and disposed on a side opposite of and facing away from the telescopic jet nozzle, the at least one cylinder configured to extend to move the abrasive jet perforating tool and the telescopic jet nozzle towards the initial hole in the radial direction, and the at least one cylinder is configured to retract to allow the abrasive jet perforating tool and the telescopic jet nozzle to move away from the initial hole in the radial direction.

A method to form perforations, comprising:

• positioning a bottom hole assembly into a wellbore formed from a terranean surface into a subterranean formation, the bottom hole assembly comprising (i) an abrasive jet perforating tool, and (ii) a hydraulically actuated subassembly attached to the abrasive jet perforating tool, the hydraulically actuated subassembly comprises one or more jet nozzles and one or more cylinders disposed on a side opposite of and facing away from the one or more jet nozzles, the hydraulically actuated subassembly configured to move the abrasive jet perforating tool towards and retract the abrasive jet perforating tool away from the subterranean formation along the radial direction, wherein the hydraulically actuated subassembly comprises;
• operating, at a first standoff distance, the abrasive jet perforating tool to perform a first blasting to create initial holes;
• in response to a first fluid pressure, extending the one or more cylinders of the hydraulically actuated subassembly to move (i) a housing of the abrasive jet perforating tool and (ii) the one or more jet nozzles towards the initial holes;
• operating, at a second standoff distance, the abrasive jet perforating tool to perform a second blasting towards the initial holes to create perforations in the subterranean formation;
• and
• in response to a second fluid pressure, retracting, by retracting the one or more cylinders, the abrasive jet perforating tool and the one or more jet nozzles away from the perforations.

A bottom hole assembly to form perforations, comprising:

• an abrasive jet perforating tool configured to couple to a downhole conveyance that is extendable from a terranean surface, through a wellbore, and to a subterranean formation, the abrasive jet perforating tool configured to inject abrasive particles along a radial direction to create perforations in the subterranean formation;
• and
• a hydraulically actuated subassembly attached to the abrasive jet perforating tool and configured to move the abrasive jet perforating tool towards and retract the abrasive jet perforating tool away from the subterranean formation along the radial direction;
• wherein the hydraulically actuated subassembly comprises a telescopic jet nozzle configured to move radially towards and away from the subterranean formation, and the hydraulically actuated subassembly comprises a pair of telescopic cylinders that are respectively positioned on opposite sides of the abrasive jet perforating tool along the radial direction, and the pair of telescopic cylinders are configured to respectively extend along opposite directions, and a first telescopic cylinder of the pair of telescopic cylinders is configured to move the abrasive jet perforating tool towards the subterranean formation, and a second telescopic cylinder of the pair of telescopic cylinders is configured to retract the abrasive jet perforating tool away from the subterranean formation.