Patent ID: 7527103

Claim:
A method for protecting a subterranean reservoir during drilling comprising: drilling a well through a subterranean reservoir using a drill-in fluid and a pipe, where: the drill-in fluid comprises: water; at least one viscoelastic surfactant (VES) in an amount effective to increase the viscosity of the water; at least one internal breaker; at least one VES stabilizer; at least one viscosity enhancer; and at least one fluid loss control agent; the pipe comprises: an interior space; an outer surface; and at least one flow conduit between the interior space and the outer surface, where the flow conduit bears within it a degradable barrier, and the flow conduit is in a retracted position at least partially within the interior space; forming a temporary coating with the drill-in fluid over at least a portion of the wellbore wall; positioning the pipe within a wellbore having a wellbore wall at the subterranean reservoir; removing the degradable barrier from the flow conduit; applying hydraulic pressure of a drill-in fluid within the interior space of the pipe and the flow conduit to form a temporary barrier in the flow conduit, and extending the flow conduit in the direction of the wellbore wall; removing the temporary barrier from the flow conduit to at least partially open the flow conduit; and removing the temporary coating on the wellbore wall adjacent the flow conduit.