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 as inclined heterolithic strata (IHS), which includes pay zones defined between low permeability layers. Some techniques include providing a well extending into the stratified region and operated to inject a mobilizing fluid, and then producing the mobilized hydrocarbons. A steam-assisted gravity drainage (SAGD) well pair can be recompleted to enable injection and production in the slanted well segments that pass through the stratified region. Some techniques include operating SAGD in a main pay zone underlying an IHS zone, and then operating a vertical well extending from the surface into the IHS and a top region of the main pay zone to inject non- condensable gas (NCG) into the IHS to form an NCG-enriched zone in the HIS and provide drainage from the IHS into the main pay zone.