Notes And Active Water Pressure And Increase Oil Recovery Technology

In this paper, the low permeability reservoir Changqing Oilfield surfactant composite by injection of the requirements to carry out a complex system of surfactant screening formulations. Through a variety of different types of interfacial tension of surfactant Evaluate contrast, ultimately used to determine surfactant composite by injection of surfactant. Taking into account that the surfactant and the Changqing Oilfield separate the role of interfacial tension values can not meet the technical requirements for increasing injection, so the formula needs a certain amount of additives to aid in decreasing interfacial tension. Taking into account the surfactants and additives in the oil sands and rocks of alkali adsorption loss of heart, a reasonable formula for determining the concentration of the scope and field pilot test to provide reference. Upon completion of Changqing Oilfield low permeability reservoir of surfactant composite formulation study, carried out activity in low permeability reservoir water flooding percolation mechanism theory. First, low-permeability core flow of water flooding experiment, and the low permeability reservoir non-Darcy seepage detailed analysis of the mechanical mechanism, due to the nature of the boundary layer of fluid has its own special variation to the nature of fluid flow, there are particular changes of. According to the low permeability core water flooding experiments, water displacing oil flow conditions, fluid showing a non-Darcy flow. This paper proposes the injection of activated water effects enhance the development of low-permeability reservoirs of technical methods, optimized for Changqing oil field under the conditions of low permeability reservoir of non-ionic surfactant mixed system, and the activity of water flooding, the relative permeability was determined by water displacement activity may help reduce interfacial tension, increase crude oil dispersed in water purposes. Through lab experiments, explained in depth analysis of the low permeability core surfactant flooding enhanced oil recovery efficiency and oil recovery mechanisms, measured at different surfactant concentration, the relative permeability curves and surfactant absorption in the hearts of rock volume into the program for the numerical simulation and design of the basic parameters. Analysis of the surfactant concentration, slug length, injection volume on the development of indexes and optimized a reasonable injection program. The program implemented in the test area, and achieved good development results and economic effects, for the efficient development of low-permeability reservoirs to provide technical tools and theoretical basis.