多角度辨识压裂套管变形的失效影响因素
发布时间：2019-02-28 15:18
【摘要】：页岩气开发具有施工压力大、排量大、改造规模大的特点,使得压裂套管处于复杂力学环境中。挤压、剪切和弯曲等载荷共同作用,易引发套管挤毁变形,进而导致后续作业时井下工具下入遇阻。但目前研究多针对压裂套管的单一失效原因,难以保障其完整可靠性。鉴于此,针对页岩气大规模压裂作业特点,从不同薄弱位置(如垂直段、造斜段、水平段)、不同自身规格(如钢级、外径、壁厚)和不同约束条件(如内压、孔径、螺距)等多角度,系统辨识套管变形的失效影响因素。通过建立压裂套管三维模拟的有限元模型,分析套管内压变化引起套管应力、位移的变化规律及形态,明确套管变形的大小以及与载荷变化的关系,并揭示套管变形的位置及影响因素的临界值。结果表明:压裂套管的造斜段最大变形、水平段应力集中现象较为严重,属于危险脆弱点;且套管最大应力、最大位移随内压的增加而近似成线性降低关系。
[Abstract]:Shale gas development has the characteristics of large construction pressure, large displacement and large reconstruction scale, which makes fracturing casing in complex mechanical environment. Extrusion, shear and bending loads can easily lead to casing collapse deformation, which leads to down-hole tool entry resistance during subsequent operation. But at present, it is difficult to guarantee the integrity and reliability of fracturing casing because of its single failure reason. In view of this, in view of the characteristics of large-scale shale gas fracturing operations, from different weak locations (such as vertical section, oblique section, horizontal section), different self-specifications (such as steel grade, outer diameter, wall thickness) and different constraints (such as internal pressure, pore size), Multi-angle, such as pitch, the system identifies the failure influencing factors of casing deformation. By establishing the finite element model of three-dimensional simulation of fracturing casing, the variation regularity and shape of casing stress and displacement caused by the change of casing internal pressure are analyzed, and the relationship between casing deformation and load change is clarified. The position of casing deformation and the critical value of influencing factors are revealed. The results show that the maximum deformation and the stress concentration in the horizontal section of the fractured casing are serious and belong to the dangerous vulnerable point, and the maximum stress and the maximum displacement of the casing decrease linearly with the increase of the internal pressure.
【作者单位】： 中国石油大学(北京)机械与储运工程学院;中国石油化工股份有限公司石油工程技术研究院;
【分类号】：TE934.2
本文编号：2431918
[Abstract]:Shale gas development has the characteristics of large construction pressure, large displacement and large reconstruction scale, which makes fracturing casing in complex mechanical environment. Extrusion, shear and bending loads can easily lead to casing collapse deformation, which leads to down-hole tool entry resistance during subsequent operation. But at present, it is difficult to guarantee the integrity and reliability of fracturing casing because of its single failure reason. In view of this, in view of the characteristics of large-scale shale gas fracturing operations, from different weak locations (such as vertical section, oblique section, horizontal section), different self-specifications (such as steel grade, outer diameter, wall thickness) and different constraints (such as internal pressure, pore size), Multi-angle, such as pitch, the system identifies the failure influencing factors of casing deformation. By establishing the finite element model of three-dimensional simulation of fracturing casing, the variation regularity and shape of casing stress and displacement caused by the change of casing internal pressure are analyzed, and the relationship between casing deformation and load change is clarified. The position of casing deformation and the critical value of influencing factors are revealed. The results show that the maximum deformation and the stress concentration in the horizontal section of the fractured casing are serious and belong to the dangerous vulnerable point, and the maximum stress and the maximum displacement of the casing decrease linearly with the increase of the internal pressure.
【作者单位】： 中国石油大学(北京)机械与储运工程学院;中国石油化工股份有限公司石油工程技术研究院;
【分类号】：TE934.2
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