A method for indirect evaluation of azimuthal fractures reorientation determination during multistage hydraulic fracturing in deviated wells
UDC: 622.276.66
DOI: -
Authors:
DOBROVINSKY D.L.
1,
SOKHOSHKO S.K.2,
SAVELEV K.YU.1,
LOMAGA K.P.1,
VILKOV M.N.1,
MALSHAKOV E.N.1
1 LUKOIL-Engineering, Tyumen, Russia
2 Tyumen Industrial University, Tyumen, Russia
Keywords: hydraulic fracturing, multistage HF in deviated wells, multistage injection technology, fractures azimuthal reorientation
Annotation:
Analysis of the theoretical and practical aspects of hydraulic fracturing (HF) application proves the fact that at the late stages of fields operation there exists no universal method for the efficient development of hard-to-recover reserves. However, the method of multistage proppant injection into a single target perforation interval of a deviated well (DW) has expanded the applicability of classical HF. This technology is based on the redistribution of the stress-strain state of the reservoir after each HF stage, which allows for changing the azimuthally oriented direction of fractures, thereby increasing reservoir coverage. Over time, it has become clear that the mechanism of fractures formation after multistage HF varies across different sites, and in some cases, single-stage proppant injection is as effective or even superior. The authors of the article review the theory of HF fracture formation, methods for estimating minimum and maximum horizontal stress as well as propose a modified multistage HF technology in a DW for indirect assessment of fractures azimuthal reorientation.
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