... 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 of underwater passage and fluid dynamics modelling data gives grounds for assertion that saturation of gravelly sand with highly structured drilling fluid (plasticity index ? 1300 s-1) helps to reduce soil porosity and increase ...

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