The Optimization of Casing Thread Types for Horizontal Tight Oil Wells in Mahu Oilfield, Xinjiang
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摘要: 为了解决新疆玛湖地区致密油水平井下套管作业过程中的套管螺纹接头断裂失效问题，采用有限元数值模拟方法和全尺寸套管实物试验方法，对比分析了下套管作业上提–下放过程中API-LC长圆扣型和TP-G2特殊扣型套管螺纹接头的连接强度和疲劳寿命。数值模拟和试验结果表明，在相同上提拉力或下放压力作用下，TP-G2特殊扣型套管螺纹接头的应力水平明显低于API-LC长圆扣型套管螺纹接头；在相同拉伸–压缩循环交变载荷作用下，TP-G2特殊扣型套管螺纹接头的疲劳寿命约为API-LC长圆扣型套管螺纹接头的6.9倍。研究表明，新疆玛湖地区致密油水平井下套管作业时采用TP-G2特殊扣型套管螺纹接头代替API-LC长圆扣型套管螺纹接头，能够更好地满足现场下套管作业技术需求，提高作业效率。Abstract: To tackle the fracture failure of casing thread joints when running casing in horizontal tight oil wells in Mahu Oilfield, Xinjiang, numerical simulations of casing thread joints and full-scale experiments on casing were conducted to compare and analyze the connection strength and fatigue life of API-LC long round thread joints and TP-G2 special thread joints during the lifting and lowering process of casing running. The results of simulations and experiments showed that the stress of TP-G2 special thread joints was significantly lower than that of the API-LC long round ones under the same tension or compression forces, and further, the fatigue life of TP-G2 special thread joints was about 6.9 times of that of API-LC long round thread joints under the same cyclic and alternating tensile-compressive load. According to our research, TP-G2 special thread joints can play a better role than API-LC long round thread joints in meeting the technical demands for casing operation in horizontal tight oil wells in Mahu Oilfield, Xinjiang and in improving operation efficiency.
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图 2 API-LC套管螺纹接头拉伸至失效时的应力云图
Figure 2. Stress distribution of API-LC casing thread joint stretched to failure
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图 3 上提拉力作用下套管螺纹接头应力云图
Figure 3. Stress distribution of the casing thread joint under tension
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图 4 上提拉力下接头外螺纹牙根处的应力分布曲线
Figure 4. Stress distribution curve of the external thread root under tension
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图 5 上提拉力下接头内螺纹牙根处的应力分布曲线
Figure 5. Stress distribution curve of inner thread root under tension
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图 6 下放压力作用下套管螺纹接头应力云图
Figure 6. Stress distribution of the casing thread joint under compression
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图 7 下放压力下接头外螺纹牙根处的应力分布曲线
Figure 7. Stress distribution curve of the external thread root under compression
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图 8 下放压力下接头内螺纹牙根处的应力分布曲线
Figure 8. Stress distribution curve of inner thread root under compression
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