Apparatus for Isolating and Completing Multi-Zone Frac Packs
AssigneeBaker Hughes Incorporated
InventorRichard Yingqing Xu
Life of this patent
Estimating the term…
Abstract
A plurality of zones is 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.
Claims5
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 an annulus around them in the subterranean location for receipt of gravel in said annulus, 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 annulus that has been gravel packed, said barrier chemical forming a barrier with the gravel in said annulus between at least two zones;
- said tubulars comprise at least one selectively opened opening located between zones;
- said assembly further comprising a straddle tool selectively insertable from the surface into said tubulars for selective isolation of said opening for delivery of said chemical into said annulus through said straddle tool.
Dependencies are inferred from the claim text.