METHOD FOR FINISHING A WELL

摘要

The invention relates to methods of boring. The method provides for stripping the roof part of the production zone, having an unusually high rock pressure, with a weighted drilling mud and stripping its remaining part with lightened muds, while simultaneously sealing the walls of the well in its roof part with hydromonitored jets of the drilling mud. The density of the lightened drilling mud is chosen so as to provide a static depression on the sealed interval. The invention may be used, in particular, for stripping a gas or gasocondensate horizon of considerable thickness (more than 500 m) to prevent gas emerging from its roof and a drilling mud absorption at its foot part, as well as to prevent seizing of the drilling or casing strings.