METHODS OF MAINTAINING SUFFICIENT HYDROSTATIC PRESSURE IN MULTIPLE INTERVALS OF A WELLBORE IN A SOFT FORMATION

摘要

This Application addresses maintaining a hydrostatic pressure exerted on a wall of a wellbore in different intervals of the wellbore. This is done by flowing a liquid through at least a pressure regulator in each interval, and wherein each pressure regulators regulates the amount of pressure exerted by the liquid on the wall of the wellbore. The amount of pressure may be maintained for a specific period of time. The wellbore is part of a soft subterranean formation.