Analysis And Simulation Of Erosion Of Sand Control Screens In Deep Water Gas Well

With the continuous development of global industrialization and urbanization,the demand for fossil energy continues to increase.Chinese deep water oil and gas resources have great potential for exploration and development,and have become an important part of China's energy structure.Deep-water oil and gas fields have shallow depth,low ground compaction,poor diagenesis and loose cementation.The reservoir properties are characterized by high porosity and high permeability.Therefore,reservoir sand production is often a problem that must be faced in the development of deep water oil and gas wells.Sand production from oil and gas wells will cause erosion and wear of equipment,increase the number of operations,reduce the production of oil and gas wells,or even stop production.Compared with land development wells,sand production in deep water gas wells is more harmful.The main reason is that the production of deep water gas wells is higher,gas production layer The airflow rate is fast,and the fluid carrying sand erosion will cause more serious wear and tear.Deep-water gas wells must be sand-proofed to improve their service life.Sand-proof screens are the most commonly used sand control tools in sand prevention in deep-water gas wells.During the production process,they will be washed away by sand-carrying fluid for a long time.When the wear is serious,sand control failure will easily occur.The production costs and offshore operations of deep water oil and gas wells are extremely high,and late workovers can cause huge economic losses.Therefore,in order to accurately control the erosion and wear of sand control screens in deep water gas wells under different sand production and production conditions and effectively predict the sand control life of screens,it is necessary to carry out numerical simulation research on sand control screen erosion.Based on the literature research at home and abroad,this paper firstly studies the theory of screen erosion in combination with the characteristics of deep-water high-yield gas wells,and analyzes the gas-solid coupling flow model according to the characteristics of gas-solid two-phase flow in the gas producing section;The empirical model of erosion screen is introduced,and the erosion angle function of discrete particles is introduced to establish a wide-angle screen erosion model of discrete particles.Then,with reference to the structural characteristics of high-quality screen,star-hole screen and wire-wound screen,three overall physical models and partial mesh screens were constructed from the aspects of geometry,mesh shape and size,and hole density.Physical model,and the physical model is modified in stages to match the pore size change of the screen during the erosion process;based on the gas-solid two-phase fluid-solid coupling model and the discrete particle wide-angle screen erosion model,consider the overall screen and sieve screen The inlet and outlet and wall boundary conditions of the joint are introduced,and the spatial discrete scheme and the pressure-velocity coupling algorithm are introduced.The gas-solid two-phase flow field distribution and the erosion wear of the sieve hole are calculated iteratively by the sub-relaxation method,and the erosion value of the deep-water gas well screen is formed.The simulation method was carried out,and the influence law of each element on the erosion and wear of the screen was analyzed.Finally,the experimental conclusions of several foreign scholars are comprehensively analyzed to determine the sand control failure criteria of three kinds of screens.Based on the numerical simulation method of deep water gas well screen erosion,the prediction method of sand control life of deep water gas wells is established.In this paper,the numerical simulation method of screen erosion for deep water gas wells and the prediction method of sand control life of screens are formed,and it is applied to the erosion wear analysis of XX wells in a deep water gas field and the life prediction of sand control screens.The results show that the established wide-angle erosion model of discrete particles and the numerical simulation method of screen erosion can better describe the process of high-speed airflow carrying sand erosion in deep water gas wells,and the prediction result of sand control life of screen is also sand control.The screen preferably provides a new basis.The sand erosion screen erosion wear simulation method proposed in this paper provides a research approach and theoretical basis for the optimization and erosion wear calculation of deep water gas well sand control screen,which is of great significance for ensuring the safe and efficient development of marine oil and gas resources.