Completion assembly

摘要

A completion assembly useful to fracture pack, gravel pack or otherwise treat production intervals traversed by an uncased wellbore is presented. The completion assembly may be used to stimulate production and/or prevent production of solid particles from the production intervals. A single trip method to fracture pack, gravel pack or otherwise treat multiple zones in an open-hole wellbore is disclosed where the wellbore has no liner or casing string installed through a production open hole portion.

主权项

1. An open-hole, single trip, multiple zone fracture pack completion assembly for single trip fracture packing operations in an uncased portion of a wellbore, the uncased portion penetrating a plurality of production intervals, the completion assembly comprising:
a) an isolation string having an inside and an outside and an upper end adapted for connection with a lower end of a cemented well casing in the wellbore and a lower end adapted for positioning on an open-hole packer positioned to support the isolation string in a selected position in the uncased portion; b) the isolation string comprising a plurality of sections, each section of the isolation string positioned in one of a plurality of the production intervals and including a first treating valve adapted to open and close a first passageway having an inlet, a second treating pressure monitoring valve adapted to open and close a second passageway having an inlet, and a third production valve adapted to open and close a third passageway having an in let, the passageways extending from the inlets through a wall of the isolation string and spaced to provide fluid communication between the inside of the isolation string and the inside of the wellbore in each of the plurality of production intervals and a screen over the openings to the second and third passageways from the wellbore; and (c) a treating string extending from an earth surface into the isolation string, a terminal end of the treating string positioned laterally between the first treating valve and the second treating pressure monitoring valve within the corresponding production interval, the treating string including:
a crossover tool configured to connect to the first treating valve via one or more seals to allow fluid from the treating sting to enter the first passageway without entry into an annulus between an inside of the isolation string and an outside of the treating string,a through port near its distal end allowing treating pressure to be communicated from the second treating pressure monitoring valve upwardly through the port into the annulus between the inside of the isolation string and the outside of the treating string without re-entry into the uncased portion of the wellbore during fracture packing, andat least one tool configured to open and close at least one of the first treating valve and the second treating valve.