The Study On The Regularity Of Fracturing Horizontal Well Water Flooding In Ultra-low Permeability Reservoirs

In recent years,ultra-low permeability reservoirs have gradually replaced conventional reservoirs and become important oil and gas resources.The fracturing technique of horizontal well is used to reconstruct the reservoir and increase the oil discharge area.Meanwhile water injection is used to provide energy for the formation.Therefore,this paper studies the effect of fractures on water flooding of ultra-low permeability reservoir at core and reservoir scales:At core scale,this paper studies the effect of fractures on the water flooding of ultralow permeability sandstone experimentally.Establishe the equivalent permeability chart through the experiment,that is used to quantitatively calculate the length of fracture in the core.Then,carry out the water flooding experiment,whicn has been clear about the flooding effect law of fracture.In addition,carry out the experiment,that the effect of fracture on stress sensitivity of ultra-low permeability sandstone,then discuss it.Carry out dynamic fracture experiment and clear rule of the dynamic fracture extension rule,then discuss it.At reservoir scale,based on the fracture network in the near well zone of horizontal wells,the effect of fracture network on the water flooding of ultra-low permeability reservoirs is studied.Through analysising the influencing factors of the fracture network,and combining with field fracturing parameters,geological data and results of micro seismic interpretation,give the characterization method of asymmetric fracture network.Then complete the characterization work of asymmetric fracture network of the horizontal well on M30 block,and has cleared about the distribution of fracture network in the reservoir.Through the numerical simulation study,the waterflooding effect of different fracture networks in the M30 block was evaluated,and the improvement measures were given.