Research On Technology Of Differential Fracturing For Anisotropic Multilayer

With the recoverable reserves of monoblock has been descending and the separate layer fracturing has been consummated;the development of thin multi-layer reservoir has received increasing attention.This kind of reservoir has the characteristics of multilayer,thin and strong heterogeneity,make the process of development confront with problems such as strong interlayer interference and interlayer development imbalance.To make development of multi-layer heterogeneity reservoir reasonable and high-performance,technology of differentiated fracturing has been researched.Massive data of fractured wells have been obtained from field.Analysis of critical factor which related to deliverability has been performed with the method of GRA.An assessment method of pre-fracturing has been established with the method of fuzzy comprehensive evaluation.This assessment method can provide quantitative evaluation of expected fracturing effect.Optimize the best range of fracture half-length and flow conductivity according to the different permeability of each sand body with the method of numerical simulation.Establish a conversion model of dynamic and static elastic parameter which is suitable for reservoir rock with the method of rock mechanics experiment.Calculate crustal stress cut planes for 18 wells with log information which has been processed by conversion model.Select fracturing technology according to the difference of number of sand bodies,span of layers and distribution of crustal stress.Perform fracturing design and construction combine with oilfield production practice.The study indicates that the design mentality of differential fracturing is reasonable and accuracy.Differential fracturing has been applied to practice and constructions of 86 wells have been done.All of them was successful and effective and this technology have increased 94,000 tons of oil.