A MUD LOSS TREATMENT FLUID AND A METHOD FOR MUD LOSS TREATMENT
The invention is a mud loss treatment fluid comprising water-swelling polymer granulates (1), where the polymer granulates (1) possess a particle size spread up to 2 mm, where the polymer granulates (1) constitute a packed, vibrated granular mix, where available pore space in the polymer granulate mix is preferably completely filled with an inert support fluid (2) with regards to swelling, where the support fluid (2) comprises an oil (3) diluted with a gel mass-forming means (4), where the support fluid (2) in the form of the oil gel mass (3, 4) and the polymer granulates (1) is arranged to be stored in a drill string (5) born tank (6) behind a drill bit (7), the support fluid (2, 3, 4) under pressure being arranged to be pushed out through a tank outlet (61) as an unseparated mass of polymer granulates (1) in gel mass (2, 3, 4), where mud loss treatment fluid (1, 2, 3, 4) is arranged to be mixed with a passing, hydrous drill fluid (8) outside of the tank outlet and to be transported to and penetrated into a mud loss zone (8) surrounding the drilling hole (9).