The Exploration On The Digital Methods Considering The Fracture Morphology Conductivity And Its Regularity

The proportion of fractured reservoirs in the oil and gas reserves increase year by year, and the good benefit oil field are mostly fractured reservoirs,so proper understanding and evaluation of formation fracture has great significance on oil/gas field development. After summarize the previous research on fracture micro morphology, found that use roughness and other qualitative methods or test methods indirect analysis the fracture conductivity and its closure regularity, the accuracy and reliability of the results is not high. New study focused on the quantitative description of the quantitative links between the change of fracture microscopic characteristics and macro characteristics,in order to format quantified formula or plates simply quantify fracture closure characteristics and flow characteristics, and form a set of molding prediction theory, so that by the simple test can get the rock fracture characteristics,to guide the actual field production. This study on several different lithologies, started from the fracture morphology, the model quantitatively reflect the mechanical characteristics of the fracture and flow characteristics through the fracture micro morphology, rock mechanics and physical parameters. On the basis of previous research, summarize the main content of the rock fracture characteristics, consolidated the proposed on this basis,which based on digital methods used3D laser scanning on the fracture characteristic, and the realization of digital methods process, also simply introduct what the team has made on this work currently, analysis the shortcomings of the fracture closure model and conductivity prediction model which have been established. For these shortcomings, through groups of rock loaded closure experiment, the study improve rock fracture closure model and further derive the model of fluid flow in rock fracture, on the basis of four groups of rock closure model validation experiments and four core displacement experiments, analyze and summarize the experimental results, compared to the measured values of the model predicted and experimental values, the error rate is very low, less than10%, so this fracture model based on the method of digital analysis and quantitative characteristics of fractures, has achieve the purpose of forecasting the conductivity, either provide a new way of thinking and quantitative evaluation method for the evaluation of the fractured core and the fractured reservoir development evaluation.