ANALYSE OF CASING FAILURE AND ITS PREVENTIVE MEASURE OF GAOTAIZI FAULT IN DAQING OILFIELD

The reason why casing failure occurred in Gaotaizi fault is analyzed from a few aspects aimed at the characters of casing failure in this area. Firstly, it is studied in theory and obtained sustain. Secondly, the field geology, the production feature and the casing failure character are analyzed synthetically.. Then, the main reason is brought forward that micro-fracture opening and extending bring mudstone sop and creep. So the production uneven load is bigger than the compressive strength of casing. This makes casing becoming ellipse. Five preventive measures have been put forward and the speed about casing failure in Gaotaizi fault become slower.