The Evaluation Of Horizontal Well Production Capacity With Staged Fracturing In Low Permeability Reservoir

The theory and practice prove that the production technology of staged fracturing horizontal well is so important that this technology is widely used in the production process of oilfield.especially in low-permeability reservoir.Therefore,it is of great significance to evaluate the productivity of fractured horizontal wells for the production of actual reservoirs.Firstly,this paper analyzes the reservoir characteristics and development situation of X reservoir,and finds that the production of single well in X reservoir is different,and the production of individual well is very low,so it is necessary to establish a reasonable production capacity model for optimization;Secondly,considering the influence factors of start-up pressure gradient and fractal geometry theory,a productivity prediction model which is more in line with the actual production is established.The dimensionless parameter,Laplace transform and Stehfest inversion method are used to solve the productivity prediction model,and a productivity prediction model solving module is developed;Thirdly,based on the productivity prediction model,combined with the COMSOL numerical simulation method,the influencing factors of productivity are studied in detail.The orthogonal test design and the gray correlation method are used to rank the influencing factors of productivity.Both methods get that the number of artificial fractures is the most important influencing factor,and the influence degree of artificial fractures is greater than that of formation parameters;Finally,based on the above research results,a rapid productivity evaluation model based on BP neural network is established,which can realize the rapid productivity of prediction and provide a new method for productivity evaluation.The research results of this paper play an important role in guiding X reservoir to carry out fracturing horizontal well efficient production,and also have a certain reference significance for the development of similar low-permeability reservoir.