METHOD FOR DEVELOPMENT OF OIL DEPOSITS IN LAYER RESERVOIRS WITH BRANCHED HORIZONTAL WELL Russian patent published in 2017 - IPC E21B43/20 E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: method used to identify at least two reservoirs which coincide on a plan and separated by interlayers-bridges. Drilling of vertical injection wells and branched horizontal production well is perfomed with horizontal shafts of required length located in the corresponding reservoir. The displacement fluid is injected through vertical injection wells and products are taken through branched horizontal production well. Actual reserves, oil viscosity and permeability for each reservoir in the development area are determined. The horizontal shafts are constructed with length directly proportional to the reserves of the corresponding reservoir being opened. The injection wells are opened by perforation of all the reservoirs. The perforation area for the respective reservoir is selected in direct proportion to the product viscosity and/or the thickness of the reservoir section. Production of oil reserves of all reservoirs with one pumping equipment of branched production well is carried out. When the operating mode of the branched production and injection wells is established, constant supervision over watering of oil being produced is performed. When watering of produced oil is 80-90%, the reservoir with the maximum watering value is determined by oil viscosity and cut from the main shaft of the production well.

EFFECT: improving efficiency of the process by providing uniform production of two or more formations and reducing drilling costs.

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