... that poor stability of gravelly sand at the interface of semi-firm clay is determined by a number of factors, including application of drilling mud, the composition of which enables formation of suspension with high sealing and low filtration capacity. Wellbore collapse and increased pulling capacity of the drilling rig resulted from the contact of the pipeline with accumulated cobble soil on the lower edge of the well and further bumping of the pipeline against the well arch. Geomechanical modelling ...

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