The Gas Injection To Improve Recovery Candidate Reservoir Screening Method And Its Application

Gas injection is one of the most important method to enhance oil recovery, but there isn't come into being a method to synthetically evaluate reservoir, which result to some reservoirs be selected have not the condition to be qualified for the gas injection, and the result of the works isn't satisfactory to reservoir engineers. It is very important to screen reservoirs and evaluate reservoirs before gas injection, and it can help us to know success or failure of the programmer.The key to evaluate the reservoir is to obtain the most prevail and important parameters, and establish the model of synthetic evaluation. This paper is base on the reservoir engineering and geology, analyzed the factor to gas injection from a large amount of actual example in abroad and internal, established the index which be used to screen reservoirs and corroborated the index's extent by theory and practice, acquired the weight of index by the method of gradation analysis and fuzzy gradation analysis, evaluated the gas injection' congruence of one reservoir by fuzzy synthetic evaluation and established the model of fuzzy excellent selection to screen reservoirs. By apply the method to actual example, verified the reasonable of the scope of evaluation parameters and the accuracy of the mathematics model. The calculation result is completely match the actual circumstance, which proofed the result of this paper would be apply to the spot.