Pressure barrier testing method

摘要

The present invention relates to a barrier testing method for testing a production casing in a borehole. The method is applied before initiating production in a well and comprises the steps of connecting a drill pipe with a first end of a first production casing having annular barriers, which annular barriers comprise a tubular part forming part of the casing and an expandable sleeve circumferenting the tubular part, thereby defining an expandable space; inserting the drill pipe and the first production casing via a drill head arranged at a top of the well into an intermediate casing extending in a first part of the borehole closest to the top of the well and at least part of the first production casing into a second part of the borehole; sealing a second end of the first production casing; pressurising the first production casing from within and expanding one or more of the expandable sleeves of the annular barriers to abut a wall of the borehole; pressurising the first production casing from within to a predetermined pressure; and testing the first production casing after expansion by measuring if the predetermined pressure is kept constant during a predetermined time period. Furthermore, the invention relates to a completion system for oil production from a well and to an oil production facilitated by the method barrier testing method.