METHOD FOR TREATING SEAM Russian patent published in 1996 - IPC

FIELD: oil/gas and water intake well exploitation, in particular, in treating seam critical zone. SUBSTANCE: seam is opened. Fracturing liquid is supplied in pulse manner to the area of hydraulic fracture. Pipe string is used to supply the liquid through. Beyond pipe space is sealed with packer. Cavity generating Venturi tube is used to supply liquid through in pulse manner. Venturi tube is connected to pipe string. Reverse valve is used to connect pipe cavity below Venturi tube to over packer space at preset pressure. In so doing preset liquid flow rate through the return valve is lower than that through Venturi tube. Then hydraulic fracture is carried out. EFFECT: higher productivity. 3 cl