METHOD OF DIB HOLE PREPARATION FOR HYDRAULIC FRACTURING Russian patent published in 2017 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, the place of packer planting is determined according to the data of geoinformation studies - GIS. The packer is lowered on the oil-well tubing (OWT) below the perforation zone and is planted, setting the dib hole no more than 10 m. Through the packer's landing device, the sand bridge is poured into the installed sump, and OWT is lifted. After the hydraulic fracturing (HF), OWT is again lowered, while washing the sand bridge from the installed dib hole with water jet. Further, additional packers are installed below main packer and perforation interval. The resulting inter-packer spaces are filled with process fluid to compensate HF pressure. Between the main and the first additional packers, the process fluid of greater density is selected. The location of the additional packers and the density of process fluid are selected taking into account HF pressure gradient.

EFFECT: increasing the efficiency of production line protection from excessive pressure in the interval of dib hole, reducing labour and energy costs, reducing the time for washing the sand bridge after HF due to a reduction in its volume.

24 cl, 1 dwg