Abstract
A method of grading limit determination for channeling paths and one of particle size calculation for plugging agents are presented. Based on channeling severity, water channeling paths in reservoirs can be divided into two kinds; that is, macropore and supermacropore. The percentages of the two kinds in layer samples can be determined from the injection profile and well performance. With these percentages, the grading permeability limits can be determined by means of the forced distribution method. The precondition of using this method is to perform normal transformation in advance to transform arbitrary permeability distributions to the normal distribution. Then calculation of the average permeability values and pore radii of macropores and supermacropores can be realized with the grading limits. To gain effective channeling treatment and reduce treatment risk, plugging agents with proper particle sizes should be selected respectively for macropores and supermacropores. With the average pore radii, the particle size ranges of plugging agents can be determined for each kind of channeling path according to the matching relationship between pore radius and particle size.
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