SIEVE DEVICE FOR UNTREATED DRILLING MUD AND A METHOD OF USING SAME

摘要

There is described a sieve device (1) for untreated drilling mud being brought up from a well and a method for use of the sieve device (1), where the sieve device (1) is provided with a filter device (3) arranged to separate a share of the drilling liquid from the drill cuttings, and where the sieve device (1) is connected to a first outlet arranged to be able to receive the drill cuttings held back on the filter device (3), and a second outlet (11) arranged to be able to receive the drilling liquid flowing through the filter device (3) and directed to the second outlet (11) via a channel (15), as the sieve device (1) is further provided with: - at least one secondary filter (13) arranged to be able to separate drill cuttings from drilling liquid, where the secondary filter (13) is arranged in said channel (15) in such a way as to lead drilling liquid through the secondary filter (13) and on to said second outlet (11); - a filter guard (17) arranged in connection with the secondary filter (13); and - a bypass arrangement (19) by means of which the filter guard (17) is arranged to be able to open for communication of untreated drilling mud held back on the secondary filter (13), into said second outlet (11) for drilling liquid.