Elimination of complications occurred by hydrodynamic pressure during running casing

Abstract

The elimination of complications occurred due to the hydrodynamic pressure at the wellbore during the running of the casing is one of the hardest tasks. During the well drilling in geologically complicated fields using drilling mud with 1800–2000 kg/m3 density, hydraulic fracture of the reservoir takes places while running of the casing due to the hydrodynamic pressure at the wellbore. This, in its turn, leads to the intensive drilling mud loss. To prevent such cases, it is necessary to have ra<0.65 coefficienct in well structure selection. This rate is the relation of well outer diameter to the wellbore diameter.