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Analysis of Fracturing Fluid Flowing Pressure Drop and Sensible Factors

Wang Peng;Wang Fengshan;Zhang Qian;First Post-doctoral Research Station in Northeast Petroleum University;Post-doctoral Research Station in Daqing Oilfield;  
Friction pressure drop of fracturing fluid was an important aspect in the design of fracturing operation,it was also the key factor of success or not in fracturing operations.Friction pressure drop of fracturing fluid was usually calculated by empirical methods or relevant calculation software,due to the limitation of fracturing fluid types and other factors,it was necessary to analyze the fracturing fluid friction pressure drop in the coiled tubing,especially the influence of fracturing proppant.Based on the research of predecessors' research achievements in this field,a case study was carried out on pressure loss of prepad fluid,sand-carrying fluid and displacement fluid in the 23/8in coiled tubing,and the sensitivity of influential factors of friction pressure drop in the fracturing fluid was analyzed,such as fluid rheology,pipe diameter,and volumetric fraction of the proppant.The analysis results show that the friction pressure gradient of fracturing fluid is sensitive to the rheological index with the increasing of consistency coefficient of fracturing fluid,the influence of coiled tubing diameter is obvious on the fracturing pressure gradient,with the decreasing of its diameter.The pressure drop coefficient and pressure gradient are first raised and then reduced with increasing of the volumetric fraction of quartz sand,and the cut-off point is in the volumetric fraction of 30%.
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