DEVELOPMENT METHOD OF SUPERVISCOUS OIL DEPOSIT IN LAYER-BY-LAYER NON-HOMOGENEOUS MANIFOLD WITH PARTIAL VERTICAL CONNECTIVITY Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: development method of superviscous oil deposit in layer-by-layer non-homogeneous manifold with partial vertical connectivity involves drilling of a pair of injection and production horizontal wells, the horizontal sections of which are arranged parallel one above another in vertical plane, warming of layer-by-layer non-homogeneous manifold by pumping of heat carrier (steam) to both wells so that steam chamber is formed, heating of inter-well zone of layer-by-layer non-homogeneous manifold with good vertical connectivity, reduction of viscosity of superviscous oil, steam pumping to upper horizontal injection well and extraction of product from lower horizontal production well. Horizontal sections of injection and production horizontal wells are drilled at the interval of layer-by-layer non-homogeneous manifold with good vertical connectivity, and at least two vertical wells are drilled in layer-by-layer non-homogeneous manifold in the beginning and end zones of horizontal sections and opened at intervals of layer-by-layer non-homogeneous manifold with decreased vertical connectivity. First, steam pumping to both vertical wells contributes to warming of layer-by-layer non-homogeneous manifold in zones with decreased vertical connectivity till hydrodynamic connectivity is formed between vertical wells; after that, steam is pumped to one of vertical wells, and product is extracted from the other vertical well. When steam penetrates into the shaft of vertical production well, extraction of product is reduced by 50% until the gas supply to the shaft of vertical production well is stopped; after that, product extraction from vertical well is renewed in the previous volume. When intake capacity of vertical injection well is reduced by 70%, hot water pumping is selected.

EFFECT: enlarging the deposit warming-up area; reduction of development period of time of productive multiformation layer-by-layer non-homogeneous manifold; complete recovery of superviscous oil deposits.

1 dwg