PROCEDURE FOR DEVELOPMENT OF MULTI-PAY OIL DEPOSITS Russian patent published in 2016 - IPC E21B43/14 E21B43/30 

FIELD: oil and gas industry.

SUBSTANCE: at initial stage the deposit is drilled out with producing wells as per triangle or square grid. Secondary opening is made through one of the pays with large oil-saturated thickness, which is the main formation. Upon the period less than ten years the deposit is compacted by drilling wells with diameter less than the drilled diameter per 1.1-1.5 times. At that for vertical and directional wells density of the well grid is increased 3-5 times. For wells with horizontal ending distance between the boreholes is decreased per 1.5-3.0 times. Simultaneously in less than 20% of wells drilled at the initial stage other formations are engaged by usage of equipment for dual production. Upon decrease in formation pressure in any of the pays more than per 50% of the initial value working agent is injected to less than one half of all operated wells, which were drilled at the initial stage. At that for two and more formations injection of working agent is carried out with equipment for dual injection or dual operation and injection. Waste water or fresh water is used as working agent with alternated injection of banks of water with pH more than 7, which constitute 5-10% of the total volume of injection for the deposit.

EFFECT: improved production rate for multi-pay oil deposits.

2 dwg, 3 ex