METHOD OF HYDRAULIC BREAKDOWN OF FORMATION Russian patent published in 2012 - IPC E21B43/267 

FIELD: oil and gas production.

SUBSTANCE: method of formation hydraulic breakdown (FHB) consists in descending the tubing casing (TS) into hydraulic breakdown zone, pressurisation of casing string annulus by packer, pumping of gas, breakdown agent under pressure through TS. Note that the gas is supplied together with the breakdown agent that is crude oil. Propping agent is supplied after breakdown agent pumping. Note that the gas is inert and it is pumped at 20-30% of breakdown agent volume at a pressure 8 MPa. As propping agent there used is acid-oil emulsion fluid with adding of inert gas at 20-30% of propping agent volume at a pressure 9 MPa. After that the pumping cycle of breakdown agent with gas and propping agent is repeated 3-6 times. Before development the process fluid with inert gas is pumped into tubing casing at 10 MPa in the volume of 20-30% of total volume equal to 1.5-fold inner volume of tubing casing with the following technological exposure for 2-3 h. Note that breakdown agent and propping agent are pumped by equal portions of total volume in each cycle.

EFFECT: simplification of FHB technological process.

1 dwg