压裂泵泵头体相贯线裂尖应力场及应力强度因子研究

发布时间：2018-08-12 17:28

【摘要】：压裂泵泵头体作为油气压裂工艺的中的关键装备,直接决定了压裂技术的成败,影响油气开采效率和经济效益。针对现有泵头体相贯线处的疲劳开裂失效现状,建立了泵头体有限元分析模型和不同初始长度的圆形裂纹断裂模型,通过分析裂尖应力场和应力强度因子的分布规律。结果表明:内压作用下,泵头体整体仍处于弹性区,只有裂纹面前方两侧的45°~70°区域进入塑性区。相贯线处的裂纹类型虽然为Ⅰ-Ⅱ-Ⅲ复合裂纹,但是仍然是I型裂纹主导,裂纹的起始位置位于两个内腔表面。不同裂纹长度,其应力强度因子分布规律基本一致;但是初始裂纹越长,裂纹越容易发生扩展。裂尖附近区域应力分布是影响裂纹起裂的关键因素,但泵头体两个相贯内腔半径也会影响裂纹起裂。通过分析泵头体裂尖应力场和应力强度因子,可以更好了解泵头体疲劳开裂原因和裂纹起裂位置,为泵头体的工程应用提供理论依据。
[Abstract]:As the key equipment of oil and gas fracturing technology, the head body of fracturing pump directly determines the success or failure of fracturing technology, and affects the efficiency of oil and gas production and economic benefits. In view of the current situation of fatigue cracking failure at the intersection line of pump head, a finite element analysis model of pump head and a circular crack fracture model with different initial lengths are established. The distribution of crack tip stress field and stress intensity factor is analyzed by analyzing the crack tip stress field and stress intensity factor. The results show that the whole body of pump head is still in the elastic zone under the action of internal pressure, and only the 45 掳/ 70 掳region on both sides of the front side of the crack enters the plastic zone. The crack type at the intersecting line is 鈪，

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