METHOD FOR EXTRACTING OIL-BITUMEN DEPOSIT Russian patent published in 2006 - IPC E21B43/24 

FIELD: oil industry, possible use for extracting a deposit of high viscosity and bituminous oil.

SUBSTANCE: in accordance to method, two-mouth horizontal well is built. Above extractive two-mouth horizontal well in parallel to it, forcing two-mouth horizontal well is built. Penetration zone is formed between wells due to forcing of water steam into both wells. After creation of penetration zone, steam is fed only into forcing two-mouth horizontal well, while product is extracted from extracting two-mouth horizontal well. Dryness degree of steam being forced in is periodically alternated. Firstly, high dryness steam is forced in to increase performance of forcing two-mouth horizontal well and share of steam in product being extracted, then low dryness steam is forced in, volume of which is determined on basis of increase of forcing pressure, which is maintained at level not exceeding opening pressure of vertical cracks. Product is extracted from extracting two-mouth horizontal well until full depletion of productive bed.

EFFECT: increased pace of warming-up, oil extraction and decreased energy costs of thermal effect process.

1 tbl, 3 dwg