Numerical Calculation And Application Of The Flow Field In Annulus With Shuttle Rod

Polymer flooding is one of the most important ways for EOR. In order to perfect water injection profile, multi-zone flow regulating of polymer injection is used, just like that of water injection. Two of the key technologies in multi-zone flow regulating of polymer flooding are the satisfactory multi-zone pressure regulating and decreasing the apparent viscosity lost of polymer solution during the process of flow regulating. As to the multi-zone pressure regulating, way of throttle is usually used, but there is big apparent viscosity lost of polymer solution; while once the problem of apparent viscosity lost is solved, multi-zone pressure regulating can't be achieved. Therefore, the paradox becomes the bottleneck of the development of multi-zone flow regulating of polymer flooding.In order to solve the problem mentioned above, combined with the situations in the oilfield, a new technology of multi-zone flow regulating in eccentric annulus with shuttle rod is proposed in this paper. The core technologies are design of the shape of flow channel in annulus with shuttle rod and definition of the number of the shuttle balls. So, the way to solve the problem is the research on the characteristics of the flow field in annulus with shuttle rod.The flow in annulus with shuttle rod is very complex. It is hard to obtain the analytical solution by solving the N-S equation. So, numerical calculation and experiments are often used to research on the problem. With the development of the application of computer and based on the derivation of the turbulent model, CFD software used for numerical calculation of flow field are applied and developed, and becomes the effective way for numerical calculation of flow field in annulus with shuttle rod.Based on surveys and researches on the CFD software information, PHOENICS software, which has plenty of turbulent models and high accuracy, was selected as the tool for calculation; simulation model was established according to the real size of shuttle rod; the flow of Newtonian fluid in annulus with shuttle rod was numerically calculated, used water; velocity distribution, pressure distribution and kinetic energy of turbulent of the flow field were given, respectively, and the flow rate, three kinds of shapes of flow channel and the influences of the number of shuttle rod on the characteristics of flow field were analysed, respectively.On the basis of successful numerical calculation of the flow of Newtonian fluid in annulus with shuttle rod, using HPAM solution, the flow of non-Newtonian fluid in annulus with shuttle rod was numerically calculated; velocity distribution, pressure distribution, kinetic energy of turbulent and apparent viscosity distribution under varied liquidity indexes were given, respectively.Through the experiments of flow of water and HPAM solution in annulus with shuttle rod, the reliability of the calculation mentioned above was testified; through researches on the apparent viscosity lost of HPAM solution under the condition of two shuttle angles and varied number of shuttle balls, respectively, reliable criteria were provided for defining the number and the included angles of shuttle balls in multi-zone flow regulating equipment in eccentric annulus with shuttle rod and decreasing the apparent viscosity lost during the process of HPAM solution injection.Based on the results of numerical calculation and experiments, multi-zone flow regulating equipment in eccentric annulus with shuttle rod was designed and produced, and applied in the oilfield of the sixth oil company of Daqing Oilfield. The application results show that the multi-zone flow regulating equipment in eccentric annulus with shuttle rod, designed in this paper, is feasible; the apparent viscosity decreases to a very lower degree, and it is in a good accordance with the request of the design.