Study On Key Factors Of Elastic Mining And Water Injection Of Tight Oil

Currently,large-scale fracturing technology is often used in the development of tight oils,so that space seam structures are formed in the formation and the permeability of the formation is improved.In the process of development of tight oil fields,the original micro-fractures in the stratum are intertwined with the fracturing structures formed by artificial fracturing,forming an intricate fracture system,and together with the dense matrix,a matrix-fracture dual media seepage system is formed.This article considers the starting pressure gradient,analyzes the percolation law of crude oil flowing from the matrix to the fracture in the formation under the premise of certain assumptions,and obtains the analysis of pressure,yield.The differences between the theoretical model and the experimental measured data were analyzed to follow up.Research laid the foundation.In fractured tight reservoirs,waterflooding efficiency is often controlled by the spontaneous ingestion of water into the matrix containing crude oil.When the matrix is wet with crude oil or neutral wetting,crude oil is difficult to produce by spontaneous leaching.The purpose of this study is to determine the combination of surfactants that can be added to the injected water and improve the deep draw efficiency.A 68% increase in infiltration before the wet reversal was then obtained by a spontaneous inhalation test on tight wet or neutral wetting sandstone cores.The results of numerical simulations also confirm that when the parameter of wettability is reversed,the amount of crude oil absorbed increases significantly,and the total amount of infiltration also correlates with the fracture density and the viscosity of the crude oil.