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HYDRAULIC FRACTURING OF UNCASED BOREHOLES WITH POLYMER SEALING TECHNOLOGY

S. Serdyukov, A. Azarov, A.Patutin
Thursday 11 October 2018 by Libadmin2018

ABSTRACT

A method of hydraulic fracturing performed in uncased boreholes with considerable variability of cross section is discussed. Sealing of the determined interval is performed by fixed polymer bridges. For its implementation, it is proposed to use two pipe strings put one into another. The external string is equipped with centralizers and an annular drill bit. It provides borehole cleaning out and delivers tool into the fracturing interval. The internal string contains five separated hydraulic channels and a multipoint injector. Accordingly, it is possible to supply required chemical components to form polymer bridges and working agent for the fracturing process independently. After the crack is formed, the bridges are drilled by the annular drill bit. It provides the connection of the drainage system and bottom interval to the wellhead. With the help of mathematical modeling a stress field is studied in the vicinity of the borehole interval, when the fluid under pressure is supplied. The obtained results show the possibility of the transverse crack formation by the developed method.

Keywords: multiple hydraulic fracturing, sealing, polymer materials, mathematical modeling


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