METHOD TO DEVELOP SMALL DEPOSITS AND SEPARATE LENSES OF OIL DEPOSIT Russian patent published in 2012 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, vertical and horizontal injection and producing wells are drilled, horizontal injection wells are drilled in parallel to the oil pool outline and/or lines of collector substitution and at least 70 metres inside the deposit from the lines specified in plan. The bottomhole of the previous well and the point of entry into the bed of the subsequent well are arranged at the distance from each other of at least 50 m. The horizontal bore is drilled with length of at least 2 distances of the confirmed grid of wells. Products are taken via producing wells. The working fluid is pumped via injection wells. Whenever the bed pressure drops below the values of 80% from the initial one and/or during watering of horizontal wells started for production, more than 90% of them are placed under injection, displacing oil to the centre of the deposit and from zones of substitution to a non-collector into a zone of collectors development.

EFFECT: improved oil recovery of the deposit.

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