DEVELOPMENT METHOD OF MASSIVE OIL DEPOSIT USING HYDRAULIC FRACTURING OF FORMATION Russian patent published in 2015 - IPC E21B43/18 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method includes construction of producers and injectors, performance of hydraulic fracturing, injection of displacement agent through injectors, extraction of formation fluids through producers. At construction of producers and injectors thickness of productive strata is defined by geophysical methods. Casing strings are rundown to the wells and fixed there by cementing. In all producers and injectors thickness of productive strata is divided into three equal zones and perforation of the casing strings is performed along the whole thickness of the productive strata with diameter of holes of 10 mm. The upper area of the casing strings in the wells is perforated with density of 20 holes per 1 m of the productive strata thickness, the middle area is perforated with density of 10 holes per 1 m of the productive strata thickness, the lower area is perforated with density of 5 holes per 1 m of the productive strata thickness. Hydraulic fracturing is performed with formation of cracks of different half-lengths in all producers and injectors bottom-up subsequently. In the lower zone of the wells a created fracture with half-length of 30-40 m is made, in the middle zone of the wells a created fracture with half-length of 50-70 m is made, in the upper zone of the wells a created fracture with half-length of 80-100 m is made.

EFFECT: higher efficiency of massive oil reservoir development.

2 cl, 2 dwg, 4 ex