Expandable liners isolate sloughing zones in directional, horizontal wells

Several Russian oil field case histories have demonstrated that expandable-profile tubulars or pipes have proven to be an effective way to control formation caving and sloughing problems in directional and horizontal wells.Wellbore stabilityWhen drilling through incompetent formations, operators face drilling operational problems that come with sloughing and cavings within specific zones. Finding effective solutions to the sloughing reduces well costs, increases labor productivity, and improves overall drilling results.Research investigations as well as local and international experience has indicated that the factors governing cavings and wellbore-stability problems within clay formation...

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