精密复合防砂筛管结构性能分析及优化

发布时间：2018-06-17 19:34

本文选题：精密复合防砂筛管 + 基管　；参考：《沈阳航空航天大学》2015年硕士论文

【摘要】：在石油开采过程中，油层出砂是疏松砂层油藏开采的常见问题。防砂筛管作为一种重要的采油防砂设备，被广泛应用在石油钻采工业中的竖直井、水平井、侧钻井和分支井等完井中。精密复合防砂筛管属于防砂筛管的一种，其具有高精度的防砂性能。精密复合防砂筛管所处的地下环境十分复杂，经常由于结构强度不足，导致结构发生破坏。外护管作用是引导含砂石油的流向从而减少含砂石油对内部防砂过滤层的冲蚀磨损，由于外护管直接受到含砂石油的冲蚀作用，极易造成冲蚀破坏，影响使用寿命。因此，对精密复合防砂筛管结构强度的研究和对外护管冲蚀性能的研究具有重要意义。本文通过使用有限元模拟仿真和实验研究的方法，对精密复合防砂筛管的结构性能进行分析研究。针对结构强度性能，利用有限元分析软件ANSYS对精密复合防砂筛管进行竖直井下入强度分析、水平井弯曲段下入强度分析和基管抗外围压强度参数化优化分析。获得了竖直井下入时堵塞情况下的临界载荷、外护管最优材料和外护管缝口处间距的最优尺寸；获得了在通过水平井弯曲段时，径厚比与径向变形、等效应力、剪切应力的关系，，并根据此关系，总结出径厚比的选取原则；通过对基管抗外围压参数化有限元分析，得到了基管的孔径参数和布孔密度参数与基管结构强度的关系，为基管圆孔尺寸的设计提出参考建议。针对冲蚀磨损性能，利用流体动力学有限元分析软件CFX，通过对外护管缝口处固液两相流的模拟分析，获得了外护管缝口处冲蚀磨损率最大值所在的位置，并获得了外护管冲蚀磨损速率与冲蚀磨损影响因素的关系，分析了冲蚀速度、砂粒直径和含砂质量分数导致结构冲蚀磨损率变化的原因。利用喷射冲蚀实验，对外护管常用材料316L不锈钢和304不锈钢的冲蚀磨损性能进行对比分析，从冲蚀磨损表面行为、冲刷腐蚀性能和冲蚀磨损临界速度三个方面出发，对外护管材料的冲蚀磨损性能进行了对比分析，得到了316L不锈钢的冲蚀性能优于304不锈钢的冲蚀性能。
[Abstract]:In the process of oil production, sand production is a common problem in loose sand reservoir. As an important oil and sand control equipment, sand control sieve pipe is widely used in vertical wells, horizontal wells, side drilling and branch wells in oil drilling and production industry. The precision composite sand control sieve pipe belongs to the sand control sieve pipe, it has the high precision sand control performance. The underground environment of precision composite sand control sieve pipe is very complex. The function of outer protection pipe is to guide the flow direction of sand bearing oil and thus reduce the erosion and wear of sand control filter layer caused by sand bearing oil. Because the outer protection pipe is directly eroded by sand containing oil, it is easy to cause erosion damage and affect the service life. Therefore, it is of great significance to study the structural strength of precision composite sand control sieve pipe and the erosion performance of external protection pipe. In this paper, finite element simulation and experimental study are used to analyze the structure and performance of precision composite sand control sieve pipe. In view of the structural strength performance, the vertical downhole strength analysis of precision composite sand control sieve pipe is carried out by using the finite element analysis software ANSYS, the entry strength analysis of horizontal well bending section and the parametric optimization analysis of the base pipe's external compressive strength are carried out. In this paper, the critical load, the optimum material and the optimum size of the distance between the outer guard pipe and the seam of the outer guard pipe are obtained, and the ratio of diameter to thickness, the radial deformation and the equivalent stress are obtained when passing through the bend section of the horizontal well. According to the relation of shear stress, the selection principle of diameter to thickness ratio is summarized, and the relationship between the structure strength and pore diameter parameter and pore density parameter of base tube is obtained by parameterized finite element analysis of the resistance to external pressure of base tube. Some suggestions are given for the design of round hole of base tube. In view of the erosion wear performance, the location of the maximum erosion rate at the outer pipe joint is obtained by using the fluid dynamics finite element analysis software CFX and the simulation analysis of the solid-liquid two-phase flow at the seams of the outer guard pipe. The relationship between erosion wear rate and erosion wear factors was obtained, and the causes of erosion wear rate, sand diameter and sand mass fraction were analyzed. The erosion wear properties of 316L stainless steel and 304 stainless steel were compared and analyzed by jet erosion test. The erosion wear surface behavior, erosion corrosion performance and erosion wear critical speed were analyzed in three aspects: erosion wear surface behavior, erosion corrosion performance and erosion wear critical speed. The erosion and wear properties of external pipe protection materials were compared and analyzed. The results showed that the erosion resistance of 316L stainless steel was better than that of 304 stainless steel.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE93

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