Calculation And Experimental Research On Erosion Rate Of Sand Control Screen In Offshore Oilfield

Offshore oil fields are mostly sandstone reservoirs,and sand control design is a key link in their oil and gas field development and design schemes.As a necessary tool for mechanical sand control,the performance of sand control screen is directly related to the success of sand control design.The main cause of sieve tube damage is erosion wear.Therefore,it is of great significance to study the erosion and wear mechanism of sieve tubes to improve sand control methods and the entire oilfield development.In order to clearly influence the principle of erosion erosion of the screen tube,and its criteria in design and selection,this paper uses a combination of numerical model simulation calculation and erosion experimental research to give the principle of erosion erosion of the screen tube and the erosion rate calculation model.A model of sand control screen tube was established,and numerical simulation of erosion was performed using computational fluid dynamics software.By analyzing the flow field distribution characteristics and erosion rate distribution characteristics of the simplified model of sieve tube erosion,the dynamic causes of the erosion ring were obtained.The results show that the main causes of erosion damage are the shear properties and kinetic energy of the sand-carrying fluid,and the shear effect is dominant.The influence factors of sieve tube erosion were analyzed,including screen structure,jet velocity,particle content and particle diameter.Among them,the presence of the screen will increase the erosion damage of the material;the increase of the jet velocity and the content of the abrasive particles will cause the erosion rate to increase;and the impact of the particle size will have a critical erosion threshold: less than or greater The critical value will cause the erosion rate to increase,but when it is greater than this threshold,the erosion rate will increase slowly and tend to stabilize.The numerical simulation results are verified by design experiments.First,the 316 L metal sieve was tested at a 90° impact angle and the experimental phenomenon was observed by scanning electron microscope.The results show that the morphology of the screen wire diameter in the central area of the erosion is basically unchanged;on the erosion edge,the screen wire diameter changes significantly and a forging fusion phenomenon occurs.It is similar to the simulation result of the screen in the simulation calculation.Subsequently,the weight loss method was used to evaluate the erosion failure of the hanging piece at an impact angle of 60°,and the results of the simulation calculation data were fitted under the same conditions.The results showed that the digital and analog results were generally higher than the experimental results,but the values could be proved within a reasonable range.Validity of simulation results.Finally,the micro-cutting theoretical formula and data results are used to obtain the erosion rate calculation model of the screen tube.