Optimization Of Corresponding Fracturing Scheme For Thin And Poor Reservoir In Xingshi Area

At present,Xingshi District of Daqing has entered the late stage of development,and the reserves of thin difference reservoir account for a large proportion of the remaining recoverable reserves,so the development of thin difference reservoir has become an important means of tapping potential.Using the conventional reservoir fracturing design method,there will be some problems,such as poor water injection development effect,great difficulty in tapping the potential of remaining reserves and limited effect of fracturing stimulation measures,so the fracturing technology corresponding to injection production system came into being.However,due to the poor compatibility between fracturing parameters and formation,the development effect has not been significantly improved.Therefore,in order to better carry out fracturing transformation,it is necessary to optimize the fracturing parameters of thin differential reservoir.The aim of this paper is to optimize the fracturing parameters of thin difference reservoir in Xingshi area.The mechanism of thin difference reservoir corresponding fracturing is studied by hydraulic fracturing electric simulation experiment and numerical simulation optimization.On this basis,the geological modeling and numerical simulation research are carried out according to the actual situation of Xingshi area,and the fracture parameters are optimized.The research method and understanding are as follows:(1)The experimental model and numerical simulation ideal model of different sand bodies are established,the production indexes under different fracture parameters are compared,and the fracturing mechanism of corresponding fracturing is analyzed.The results show that corresponding fracturing can significantly improve the pressure distribution between oil and water wells in thin difference reservoir,effectively communicate two different sand bodies,and have good stimulation effect;fracturing well can effectively improve water The stimulation effect of the well,but increasing the fracturing scale of the well has less impact on the production index,so the fracturing should be focused on the oil well in the corresponding fracturing;when the fracture does not penetrate the boundary of the sand body,increasing the fracture radius can significantly improve the fracturing effect,when the fracture penetrates the boundary of the sand body,increasing the fracture radius will gradually reduce the impact on the fracturing effect.(2)Combined with the actual data of Xingshi District,the geological model is established and the numerical simulation study under different fracture conditions is carriedout.The results show that the optimal fracture penetration ratio is 33.33% when the oil-water well spacing is 150 m in the five point method well pattern of Xingshi District,and the optimal fracture penetration ratio is 33.33% when the oil-water well spacing is 200 m in the seven point method well pattern of Xingshi district The ratio is 40%.(3)There is a limit fracture penetration ratio in the corresponding fracturing of thin difference reservoir.When the fracture penetration ratio exceeds the limit,although it can improve the production and injection effect of oil and water wells in a short time,it will also advance the water breakthrough time of oil wells;for the corresponding fracturing with the same scale of oil and water wells,the time to increase the fracture radius of oil wells is longer than that to increase the fracture radius of water wells.(4)The influence of fracture radius on production index is great,while the influence of conductivity on production index is relatively weak.Therefore,in order to improve the corresponding fracturing effect of thin and poor reservoirs,fracturing long fractures should be the main method.