Method For Regulating Reservoir Physical Model Parameters

With the development of oil and gas field development theory and research,the demand for reservoir physical model is becoming more and more urgent,and the requirements for the regulation level of reservoir physical model performance are getting higher and higher,therefore,the regulation of reservoir physical model parameters is carried out.In this paper,the main controlling factors and related laws of permeability and porosity of reservoir physical model are studied experimentally,and the method for controlling the permeability and porosity of reservoir physical model by particle size and its distribution and pressing pressure is formed.The physical model of the reservoir produced by this method has an error of less than 10% in permeability and target value,and the error between porosity and target value is less than 8%.Based on the particle size distribution curve of the target reservoir core,the method selects the model sand whose particle size peak is close to the target peak,and finely sorts the model sand or combines several model sands according to the deviation between the model sand and the target,realizes the similarity between the grain size distribution curve of reservoir physical model and the target grain size distribution curve,and forms the control method of the grain size distribution of reservoir physical model.The results show that the reservoir physical model made by this method is in good agreement with the grain size distribution curve of natural cores.Based on the study of particle size distribution,,reservoir physical models of three different mercury intrusion curves can be produced by adding micro-nano sand,which include “single-level”,“single-slope” and “double-order”,and the pore throat distribution of reservoir physical model is similar to that of natural core.By improving the curing mode,stirring method and configuration of inorganic glue,the permeability of the hypotonic-tight reservoir physical model can be reduced by two orders of magnitude,which lays a foundation for the development of the hypotonic-tight reservoir physical model.