METHOD OF HYDRAULIC FRACTURING OF WELL FORMATION Russian patent published in 2014 - IPC E21B43/267 C09K8/80 

FIELD: oil and gas industry.

SUBSTANCE: method includes perforation in the formation interval, running in of a pipe string with a packer, setting of the packer, injection of a gelled fracturing fluid to the below-packer zone, filling of the pipe string with a process fluid, determination of the total volume of the gelled fracturing fluid, creation of a hydraulic fracturing pressure in the below-packer zone and flushing of the gelled fracturing fluid with a proppant to the formed fracturing, withhold during the time required for the pressure drop per 70%, the packer releasing and the packer removal with the pipe string from the well. Upon determination of its total volume the gelled fracturing fluid (linear gel) is injected to the well until hydraulic fracturing is formed in the formation, while the remaining volume of the gelled fracturing fluid upon hydraulic fracturing is divided into two parts - a cross-linked gel and a linear gel, cyclic injection of the linear gel at first and then of the cross-linked gel is made with addition of the proppant during 3-5 cycles. At that the linear gel is injected by equal portions with a flow rate of 4-6 m³/min and the proppant concentration of 400 kg/m³, while the cross-linked gel is injected with increasing volume from 3 up to 7 m³ with a flow rate of 1-2 m³/min and the proppant concentration of 1200 kg/m³. At that fibreglass in a quantity of 1.5% of the proppant weight is added to the last portions of the linear and cross-linked gel with the proppant.

EFFECT: improving efficiency of hydraulic fracturing.

2 dwg