IN SITU HYDROCARBON RECOVERY FROM PAY ZONES BETWEEN LOW PERMEABILITY LAYERS IN A STRATIFIED RESERVOIR REGION

摘要

Techniques are described for recovering hydrocarbons from a stratified region,such asinclined heterolithic strata (IHS), which includes pay zones defined betweenlowpermeability layers. Some techniques include providing a well extending intothestratified region and operated to inject a mobilizing fluid, and thenproducing themobilized hydrocarbons. A steam-assisted gravity drainage (SAGD) well pair canbe re-completed to enable injection and production in the slanted well segments thatpassthrough the stratified region. Some techniques include operating SAGD in amain payzone underlying an IHS zone, and then operating a vertical well extending fromthesurface into the IHS and a top region of the main pay zone to inject non-condensablegas (NCG) into the IHS to form an NCG-enriched zone in the IHS and providedrainagefrom the IHS into the main pay zone.