Reservoir Fluid Pvt Characteristic Parameters Of Prediction Methods

The geological configuration of Shengli petroliferous province is extremely complex, there are a great variety of reservoir types and oil-gas components, Up to now old oilfields have been produced for nearly 40 years. The reservoir characteristics have had a great change in comparison with those at development early period especially due to using varied EOR (enhanced oil reservoir) methods such as waterflood and polymerflood. Getting to know varying rule of reservoir fluid parameters has great significance for investigating next production project.The features of low pressure and high water-cut which were widespread existence in new oil wells have brought a lot of troubles on high-pressure physical property sampling along with further exploration and development of Shengli Oilfield. The parameters of high-pressure physical properties are absolutely necessary to evaluation of reservoir properties and calculation of oilfield reserves. So, it is necessary to performance prediction of reservoir physical characteristics using prediction of phase characteristic parameters on the basis of early data of high-pressure physical properties, and it has guidance role for working out production project.The well effluent represented inner compositions of reservoir fluid and was a basis of numerical simulation. Prediction of reservoir parameter and it's variation by analyzing well effluent has been much carried out at home and abroad. To date theoretical research on gas-liquid-solid three-phase equilibrium in reservoir fluid is a popular subject of petroleum industrial world at home and abroad. The systematic theoretical research on gas-liquid-solid three-phase equilibrium, establishing three phase model and characterized calculation of gas-liquid-solid phase equilibrium is a new topic for Shengli Oilfield. The phase behavior prediction of reservoir fluid is beneficial to monitoring reservoir change and to mastering newest parameter variation of reservoir fluid in time, it will lay down a foundation for developing Shengli Oilfield and it is also an inexorable trend of reservoir research at home and abroad.This paper reviewed basic theory on analyzing and studying PVT of reservoir fluid and relational experiential formulas for predicting PVT parameters at home and abroad. The relational experiential formula of Shengli petroliferous province was summarized. The high-pressure physical parameters were predicted by well effluent numerical simulation, thermodynamic model of gas-liquid-solid three-phase equilibrium was established, and crude characterization method was improved. The simulation software of high-pressure physical parameters and well effluent parameters was compiled. The method and formula given by this paper have been used at field. The good effect was gotten. It will provide basis and lessons for exploration and development of Shengli Oilfield.