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Abstract The complicated wellbore leakage issue has been the major engineering problems in the exploration and production of petroleum industry. In this paper，fracture morphology is obtained by simplifying log data，the influence factors of fracture stress intensity factor K are decomposed and analyzed according to the mechanism；then pressure bearing capacity model of multilayer is established based on the decomposition of influence factors of K，the relationships between pressure bearing capacity，sealing position and sealing particles are calculated and discussed. Through the calculation，it is believed that plugging position has great influence on pressure bearing capacity. The larger the distance from plugging position to fracture tip is，the larger the pressure bearing capacity is. When fracture position is settled，pressure bearing capacity decreases linearly along with the increase of fluid column pressure in wellbore. The smaller the distance from plugging position to fracture tip is，the larger the decreasing amplitude of pressure bearing capacity is. This model can be used for plugging materials selection and optimization of plugging formula. Optimizing plugging particles of different diameters is done through the establishment of fracture width model，plugging formula that suitable for the Jidike Formation of Tarim Oilfield is developed and verified through field test. It is proved that this model is suitable for the field plugging operation.
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Received: 27 August 2011
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2012, Vol. 31 
