Devices and methods for formation testing by measuring pressure in an isolated variable volume.

摘要

Device (1) for formation testing while drilling,
comprising a drill string (2) with a packer (3) arranged on the
drill-string above a drilling-bit (7), the packer can be expanded and
thereby isolate a lower open part (6) of a well-bore, distinguished
in that the packer is fastened sealingly but slideably on a distance
(4) of the well-bore, such that the drill-string can be brought up
and down, with or without rotation, within said distance while
the packer stands stationary expanded in the well- bore, and the
device comprises at least one pressure transmitter for measuring
and transferring in real-time to the surface measured pressure
in the isolated lower open part of the well-bore. Methods for
formation testing utilizing the device. Device for formation testing
of a production well.