Structurally Optimizing Rubber Cylinder of Compression Packer and Analyzing Its Open-eye Sealing Performance
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摘要: 压缩式封隔器广泛用于油田分层开采工艺，其胶筒的坐封通过高压流体作用在活塞上压缩胶筒或管柱来实现。现场作业发现：压缩式胶筒离载荷端较远，且大多采用单向加载，导致坐封不完全，接触应力与密封性能系数较低。针对上述问题，基于Mooney-Rivlin超弹模型、胶管变形及接触非线性理论，建立压缩式胶筒组有限元计算模型,从内衬套和防肩突结构开展单因素分析，并对其裸眼密封性能进行研究，结果表明：三角形内衬套能有效提高胶筒中部接触应力；金属圆环防突结构能提高胶筒密封性能系数；与常规压缩式封隔器相比，优化后的压缩式封隔器密封性能显著提高；裸眼井壁的不规则程度在一定范围内时，对封隔器的密封性能影响不大。Abstract: A compression packer is widely used in an oilfield’s stratified production processes, and the setting of its rubber cylinder is achieved by compressing the rubber cylinder or pipe string through the action of high-pressure fluid on the piston. Field operations find that the rubber cylinder is far from the load end and that the majority of it are loaded in one direction, resulting in incomplete setting and low contact stress and sealing performance coefficient. Due to the above problems, based on the Mooney-Rivlin hyper-elastic model, the hose deformation and contact nonlinear theory, the finite element model for calculating the compression rubber cylinder group was established, and the single factor analysis was carried out from the inner bushing and the anti-shoulder structure, and the open-hole sealing was carried out. The performance is studied, and the results show that: 1） the triangular inner bushing can effectively improve the contact stress in the middle of the rubber cylinder; 2） the metal ring anti-burst structure can improve the sealing performance coefficient of the rubber cylinder; 3） compared with the conventional compression packer, the sealing performance of the optimized compression packer is significantly improved; 4） when the irregularity of the open hole wall is within a certain range, the sealing performance of the compression packer is not affected much.
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Key words:
- compression packer /
- contact stress /
- shoulder protrusion /
- sealing performance /
- open hole wall
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图 2 压缩式胶筒组结构参数
Figure 2. The structural parameters of the compression-type rubber cylinder assembly
图 3 压缩式胶筒组Mises应力云图
Figure 3. Mises stress cloud map of compression-type rubber cylinder assembly
图 4 胶筒组沿轴向距离的接触应力曲线
Figure 4. The contact stress curve along the axial distance of the cylinder assembly
图 6 不同内衬套结构胶筒组的接触应力曲线
Figure 6. Contact stress curves of cylinder assemblies with different inner liner structures
图 7 不同内衬套结构胶筒组的密封性能系数曲线
Figure 7. Coefficient of sealing performance curves for cylinder assemblies with different inner liner structures
图 8 不同内衬套结构肩突曲线、压缩距柱状及胶筒变形图
Figure 8. Shoulder protrusion curves, compressed distance cylinder charts, and cylinder deformation maps for cylinder assemblies with different inner liner structures
图 9 两种防突结构结构参数
Figure 9. Structural parameters of two types of anti-protrusion structures
图 10 3种结构胶筒组的接触应力曲线
Figure 10. Contact stress curves for three types of cylinder assemblies with different structures
图 11 3种结构胶筒组的密封性能系数曲线
Figure 11. Coefficient of sealing performance curves for three types of cylinder assemblies with different structures
图 12 3种结构胶筒的肩突值曲线图、压缩距柱状图
Figure 12. Shoulder protrusion value curves and compressed distance cylinder charts for three types of cylinder assemblies with different structures
图 13 3种结构胶筒变形图
Figure 13. Deformation maps of three types of cylinder assemblies with different structures
图 14 优化前后胶筒变形位移对比图
Figure 14. Comparison of cylinder deformation displacement before and after optimization
图 15 优化前后胶筒接触应力对比曲线
Figure 15. Comparison of cylinder contact stress curves before and after optimization
图 16 不规则裸眼井壁三维模型图
Figure 16. A three-dimensional model of irregular open-hole well walls
图 17 压缩式胶筒组在裸眼井壁的接触应力云图
Figure 17. Contact stress cloud map of compression-type rubber cylinder assembly on an open hole well wall
表 1 橡胶材料本构模型力学性能常数
Table 1. Mechanical performance constants for rubber material constitutive models
胶筒硬度 弹性模量 C10 C01 75 HA 8.76 MPa 1.124 0.056 80 HA 10.98 MPa 1.533 0.0767 85 HA 13.80 MPa 1.926 0.963 
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表 2 优化前后值与优化预测值分析表
Table 2. Analysis of values before and after optimization and predicted optimization values
状况 最大接触应力 密封性能系数 肩突值 优化后 12.9 MPa 732.8 MPa·mm 1.28 mm 优化前 13.4 MPa 554.9 MPa·mm 5.8 mm
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