Numerical Simulation Of Microbial Enhanced Oil Recovery Research

At present, the common technologies of oil exploitation (water injection, gas injection, etc.) can only exploit out 30—50% of the OOIP. For the sake of exploiting out more residual oil in the reservoir and enhance the recovery efficiency, people have excogitated many techniques from 1950's. However, the evident disadvantages of these methods affect the final recovery factor. Microbial enhanced oil recovery (MEOR) is a new kind of EOR technique that is flourishing in the recent 20 years. Because of the advantages of low cost price, strong adaptability, simple manipulation and innocuousness (when in the stratums and any other surroundings), this technique have been accepted by countries all around the world. Approximately, 40~45% of the reservoirs in the world have the immense potency of being exploited with the new method. Application and popularization of MEOR is a significant stratagem for the east oil fields in our country to enhance recovery factor and maintain current output. At the same time, it is helpful to the sustainable development of petroleum industry of our country.As to the oil displacement mechanism and mathematical model, the disquisitive institutions, academies and fields in the world have done a lot of laboratorial studies and field tests of them. As far as China is concerned, now we mostly use foreign bacterium and technologies. This give birth to some problems. The first is that heavy price of imported microbial products indicate high cost of manipulating. The second is that using foreign bacterium and techniques put the scientific researchers of our country at a disadvantage to study the quantitative relations between different substances and find out the systemic parameters of microbial system. Resultantly, we have not made quiet great progress in theory, exploiting local bacterium and developing MEOR simulation software, though we bore fruit in laboratorial studies and field tests in the past. Therefore, the urgent affairs are setting up database of local bacterial category and carry through the numerical simulation of MEOR.In this dissertation, the parameter obtainment and mechanism of MEOR, qualifications when microorganism is used for oil displacement and status quo of studying mathematical models are considered synthetically. Based on transport dynamics, nutrition requirement ,growth and propagate mechanism of microorganism in the porous medium, a new kind of numerical simulation model as well as software of using microbe to control injection profile in the reservoir, or microbe enhanced oil recovery simulation(MES) is developed. Growth, propagate, decease, nutrition, metabolism, transport dynamics and oil placement mechanism(include mostly profile control ) of microbe system in the hole medium are taken into consideration. As a result of checkout of the Equations, compute, method and simulation software by using a three-dimensioned reservoir model, the model and software of MES simulate the process of microbe system to growth, transport and enhance oil recovery factually and detailedly. It offers a series of credible theories and study method of MEOR(mostly is profile control), which have importantguiding significance and application value for using microbial technologies to enhance recovery efficiency.