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《Fault-Block Oil & Gas Field》 2018-03
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Experiment of dynamic closure behavior of discontinuous sanding fracture

CHEN Xingyu;HE Yunbin;HE Feng;YIN Congbin;ZHU Juhui;CCDC Downhole Service Company,CNPC;Oilfield Technology Service Company,Ltd.,CNPC;  
Whether the proppant group could maintain the state of effective discontinuous dispersion during the process of dynamic closure of fracture is the key factor to the success of discontinuous sanding fracture in unconventional reservoir. The prototype devices simulating fracture dynamic closing process were developed to perform corresponding experimental tests which consider the leak off of fracturing fluid. The variation of accumulative fluid loss amount, fracture width and fluid pressure in the fracture with the dynamic fracture closure time were analyzed. The experiment results show that the dynamic fracture closure process can be divided into three stages, initial stage of fluid pressurization in fracture, middle stage of transition, later stage of proppant group pressurization, which are respectively controlled by fluid leak off, deformation of compressed proppant group, partial embedding and crush. Meanwhile accumulative fluid loss amount and fracture width present a sharply increasing middle stage and a steady trend in the initial and later stage with closure time. Combined with the distribution state of proppant in non-continuous sanding fracture,channel rate within fracture and holding rate of fracture width were defined to characterize the feature of channel and dynamic fracture width in discontinuous sanding fracture precisely in the form of mathematical formula. Based on the experiment results, the mathematical model parameters such as leak off coefficient of fracturing fluid, proppant group height, deformation of fracture were corrected to optimize the fracturing and acquire the optimal channel rate within fracture.
【Fund】: 国家科技重大专项课题“水平井压裂设计优化系统”(2016ZX05023-001)
【CateGory Index】: TE357.1
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