PROCEDURE FOR DEVELOPMENT OF OIL DEPOSIT WITH CLAYEY COLLECTOR Russian patent published in 2014 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method involves pumping of working agent through injectors and recovery of products through producers. For the purpose of development a pool or a poll part is selected with formation pressure at least equal to the initial one, water cut of 60% and more and recoverable reserves of at least 40 thousand t. Then the post-event analysis is made for the selected section in regard to changes in dynamics of formation and bottomhole pressure and the least worked-out section with content of clay fraction of 2.5% and more. Upon the preformed analysis several design point of drilling for vertical inclined well are replaced by one injector with horizontal completion. The horizontal shaft is placed in the stratum with thickness of at least 3 m. The shaft is constructed at the border of the reservoir collector transition from clayey sandstone to aleurolite. Upon input of the horizontal injector into operation liquid is injected into the stratum under permanent control of changes in operation mode of the surrounding producers by means of bottomhole pressure measurement and product water cut. When bottomhole pressure rises up to the value sufficient to intensify product recovery operations on optimisation of subsurface pumping equipment are made to a bigger standard size. Upon the preformed analysis several design point of drilling for vertical inclined well are replaced by one producer with horizontal completion. The horizontal shaft is placed in the stratum with thickness of at least 3 m. The shaft is constructed at the border of the reservoir collector transition from clayey sandstone to aleurolite. Upon input of the horizontal producer into recover of reservoir liquid is made under permanent control of changes in operation mode of the surrounding producers by means of bottomhole pressure measurement and product water cut. When bottomhole pressure decreases per 10% below saturation pressure operations on injection increase are made through the affecting injectors.

EFFECT: improving oil recovery in the deposit with clayey collector.

2 cl, 2 ex