| In this paper,two physical simulation experiments,water and electricity simulation and fracture visualization flow simulation,are used to study the flow law of fluid in the complex fracture network of tight reservoir.As the complex fracture network is composed of simple fracture network elements,six basic fracture networks are designed in this paper to study the effects of different fracture networks on the productivity of tight reservoirs through hydro-electric simulation experiments.Secondly the fracture flow visualization model is designed by using organic glass,through etching random distribution of natural fracture on the tablet to simulate the real seam dense oil reservoir of complex network,aiming at the common way of dense reservoir development-branch wells and the fracturing of horizontal wells,design branch of the vertical wells,horizontal branch wells and fracturing horizontal well model,research in different development mode density the influence factors of reservoir fluid flow in complicated seam network.Through the experimental study,the following points are obtained:(1)the larger the crack width and the better the crack density,there is an optimal value;(2)The orthogonal seam network can improve the productivity of tight reservoir more than the oblique seam network;(3)The faster the injection speed is,the lower the final recovery rate will be.(4)The greater the oil reservoir fluid viscosity,the lower the recovery rate,can reduce the fluid viscosity to improve the recovery rate of tight reservoir;(5)the more injection boundary,the higher recovery rate,can increase the injection boundary to enhance the recovery rate of tight reservoir;(6)Different side branch wells than the same side branch wells higher recovery,horizontal branch wells than vertical branch wells higher recovery,fracturing horizontal Wells than the general horizontal wells higher recovery.Some understandings obtained are of guiding significance to the development of the actual tight reservoir. |
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