An Research And Prediction Of The Multi-Phase Flow Parameter In Wellbore

During the oil field development, the oil production technology is the key to operate successfully. With the current technology, field development depends current technology and methods. A reasonable plan is needed for oil production efficiently. Oil and gas exploitation is connected with multi-phases flow. In a mixture flow, the surface and distribution of each fluid vary from different transport condition, and may form all kinds of flow regime. The flow regime decides the fluid’s feature directly, and it is the vital part of multi-phases research.The oil under the ground flow towards the wellhead by artificial devices. When the flow pressure under the bubble pressure, gas start separating out from the oil and exists as dissociated form, creates a water-oil-gas three-phases flow situation. To improve the oil recovery, gas and water injection technology has been applied widely, which makes the multi-phases phenomenon is more likely to occur during the production.Performing multi-phases experiment in lab provides data for studying the factors that affects the pipeline flow. Using the experimental and field data to find out what situation each prediction method suits for. These work could offer a reference for field production. From the last century, researchers submit their calculating correlationships by doing all kinds of pipeline flow experiment and fix the result with the field data, and some are based on theory deduction. In the early times, people usually used water and air to conduct the flow experiment, then some used oil instead of water. The recent flow studies are concern all the fluid include water, oil and gas in pipe flow as the development of the industry.In this study, we used different pipe diameter, gas-liquid ratio, liquid rate, inclination angle and water-cut to implement the flow feature research by changing the flow condition character. After analyzing the data recorded, establish the corresponding figure and table to find out the key influential factor. Combining the data recorded with the pressure drop calculating methods that offered by the former researchers, improving them and checking the calculated result. The tube flow character researches are present in charts to show the relationship with the pressure gradient. The data recorded shows that the pressure drop increased when the liquid rate grown. The relationship between pipe diameter and pressure gradient is complicated, the pressure drop shows decreasement in narrow pipe while grows in wide line with the gas rate raised. When the tube has a great gas-liquid ratio, the boarder the pipe is the faster the pressure drop, this phenomenon is not obvious in low gas-liquid ratio condition. The pipeline inclination angle has a notable influence on pressure gradient between 0°and 60°. The hold-up affects the pressure in board pipeline, the pressure difference between the inlet and outlet shows a nearly linear relationship with the hold-up, but the relationship is not clear in narrow tube. The water-cut shows a faint effect on pressure drop.Combined the researcher’s result and the data record in lab to study the flow character in pipe, and calculated the field data to check the prediction method. We recommend the Duns-Ros method used for wide pipe and oil-gas flow sotuation, the Beggs-Brill method used for narrow pipe and high gas-liquid ratio condition, Aziz-Govier-Fogasari method used for wide tube, high gas-liquid ratio and oil-gas-water flow condition, the Hagedorn-Brown method and Orkiszewski method could be a referenced method.