Patent ID: 6364017
Filing Date: 2002-04-02
Classification: E21B

Abstract:
A method for perforating and gravel packing a wellbore in a single trip comprising:a) running a single trip perforating and gravel pack system into the wellbore on a workstring, the system comprising: i) a completion assembly comprising a hydraulically set upper packer, a sliding sleeve assembly having one or more flow ports and a slidable sleeve shiftable to open or close the flow ports, an upper polished bore receptacle having an internal seal bore, a gravel pack screen, a lower polished bore receptacle having an internal seal bore and a lower packer; ii) a perforating assembly connected to the lower packer, the perforating assembly comprising a firing head and a perforating gun; iii) a retrievable service assembly comprising a hydraulic setting tool and a crossover tool assembly, the hydraulic setting tool being releasably connected to the upper packer and comprising a top sub adapted to be connected to the workstring on its upper end and an upper body on its lower end, a housing attached about the outer diameter of the upper body, wherein a setting piston and a locking assembly are enclosed within the housing, the locking assembly comprising a lock sleeve, one or more piston lock keys and a locking collet, wherein the lock sleeve is adapted for slidable movement along the internal surface of the upper body and includes a landing profile on its internal diameter, the landing profile being adapted to receive a shifting tool, wherein the piston lock keys are spaced about the outer diameter of the lock sleeve and are initially maintained in a locked position by the lock sleeve to lock the setting piston relative to the upper packer, a setting sleeve connected to the setting piston for setting the upper packer; the crossover tool assembly is connected to the hydraulic setting tool and comprises an upper crossover mandrel having a plurality of radially extending flow ports, one or more upper seal units, a ported crossover sub having a plurality of gravel flow ports and a plurality of longitudinally extending return flow passages extending between the gravel flow ports, one or more lower seal units, a bypass tube, a check valve, a washpipe, a sliding sleeve shifting tool and a seal assembly wherein the return flow passages are in communication with the annular flow passageway extending between the bypass tube, upper seal units and the crossover mandrel and between the lower seal units and the washpipe; b) positioning the perforating gun in the wellbore adjacent a production zone and setting the lower packer; c) detonating the perforating gun; d) unsetting the lower packer; e) repositioning the system so the gravel pack screen is positioned adjacent the perforations; f) resetting the lower packer; g) landing a shifting tool in the lock sleeve of the hydraulic setting tool; h) shifting the lock sleeve from a locked position to an unlocked position thereby releasing the piston lock keys from the setting piston; and i) applying hydraulic pressure to the setting piston to set the upper packer.