ERW BOREHOLE STABILITY EVALUATION OF XIJIANG OILFIELD IN SOUTH-CHINA SEA

In this paper,borehole stability of extended reach well drilled in Xijiang oilfield is evaluated using the integrated techniques for borehole stability analysis.The safe mud density window of this oilfield is presented through systemically analyzing of pore pressure,in situ stress,formation strength,and log data processing.The results are successfully used for proper mud density determination and casing program design.The borehole stability evaluation results of Xijiang 24-1 oilfield overthrow the conclusion that the borehole would be unstable when hole angle exceed 45 degree,which was given by international authoritative research institution.The results exert important effect on the successful drilling of extended reach well in Xijiang 24-1 oilfield.