Apparatus for isolating and completing multi-zone frac packs
AssigneeBaker Hughes Incorporated
InventorRichard Y. Xu
Life of this patent
Estimating the term…
Abstract
A plurality of zones are gravel packed together and then isolated from each other in the gravel annulus by formation of a barrier in the gravel annulus. The screen assembly carries a series of chambers internally that are located between the producing zones generally in the area of blank pipe between the zones. The wash pipe has a shifter associated with it so that extraction of the wash pipe after gravel packing will serially shift pistons that reduce chamber volume where the chemical is stored. The chemical will exit through a rupture disc and nozzle and will commingle with the gravel and make an impervious annular barrier.
Claims14
A completion assembly for subterranean use from a surface in multiple zones that are gravel packed together, comprising:
- a plurality of screens spaced apart with tubulars that define a gravel packed annulus around them in the subterranean location, said annulus spanning multiple zones and said annulus is isolated from the surface by at least one packer;
- at least one barrier forming chemical delivered from said tubulars into said gravel packed annulus, said barrier forming chemical forming a barrier with the gravel in said annulus between at least two zones;
- said barrier forming chemical disposed in a chamber having at least one rupturable barrier on at least one outlet of said chamber, said chamber isolated from pressure in said annulus with said rupturable barrier in place;
- wherein pressure in said chamber is initially increased from a predetermined value during run in on reduction of the volume of said chamber to remove said rupturable barrier when said screens are located adjacent said multiple zones.
Dependencies are inferred from the claim text.