Pumping Segmented Perforation Technology In Horizontal Wells

With the increasing demand of domestic oil and natural gas energy and the decreasing contribution rate of conventional reservoirs,in order to ensure the productivity of oil and gas resources,unconventional reservoirs,low permeability reservoirs and thin reservoirs have become the main direction of oil and gas development.Unconventional and low permeability reservoirs have the characteristics of low porosity and low permeability reservoirs.Due to their poor physical properties,their effective development has become a prominent problem in current oil and gas development.For low-porosity and low-permeability reservoirs,the pore channels on which oil,gas and water flow are very fine,so the seepage resistance is high,which leads to the change of seepage law caused by low-speed seepage of fluid and deviates from Darcy's law.The original large pore is destroyed,resulting in the decline of rock permeability.This phenomenon is more prominent in low porosity and low permeability reservoirs,leading to the decline of production of test wells.A large number of field applications show that the working parameters of the pump are more sensitive to the performance of the parameters such as the buoyancy of the gun string,the density of the transported liquid,and the frictional resistance coefficient of the liquid in the tube,With the development of technology,horizontal well pumping bridge plug perforation is widely used in unconventional reservoir development.This technology can greatly reduce the damage of perforation to the target layer of perforation,and can achieve the purpose of volume transformation..At the same time,the two parameters of well depth parameters and the certain momentum of the cable itself are included in the mathematical model that affects the study of pump parameters.Mathematical model calculation is available,the higher the wellhead pressure,the more sealant is pumped in and The minimum value of the required tube bundle quality is also higher.The peak value of the tube bundle length is negatively correlated with the peak value of the dogleg.There is a matching relationship between the pump displacement and the cable release rate.The comparison between the field application and the mathematical model shows that the difference between the model simulation value and the actual production value at each stage of construction is reasonable Within the scope,it is believed that this model can be used in the adjustment of actual production pump parameters.