The Effect of Hydraulic Anchor Structure on Casing Deformation and Extrusion Stress
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摘要: 为优化水力锚爪结构参数,减小水力锚爪结构对套管的损伤,针对普通螺纹齿形锚爪和镶硬质合金锚爪结构,利用材料力学理论建立了镶硬质合金锚爪接触处套管所受的挤压应力公式,采用有限元法分析了普通螺纹齿形锚爪接触处套管的变形及挤压应力。分析表明,普通螺纹齿形锚爪和镶硬质合金锚爪均会对套管产生不同程度的损伤;在相同油管内外压差作用下,与镶硬质合金锚爪相比,普通螺纹齿形锚爪接触处套管所受挤压应力和径向变形较小,对套管损伤最小。研究结果表明,试油压裂用水力锚结构应采用螺纹齿形设计;在相同油管内外压差作用下,镶硬质合金锚爪接触处套管所受挤压应力随牙齿楔角增大呈幂律指数降低,随牙柱直径增大呈幂律指数下降,随锚爪直径增大呈多项式增大,随牙齿后角呈指数增大,但增大幅度较为平缓,随轴向载荷增大呈多项式增大,但增大幅度较小;建议牙齿楔角取10°,锚爪牙柱直径取10~12 mm,锚爪直径取40~50 mm。研究结果为水力锚锚爪结构设计提供了理论依据。Abstract: In this paper, an analysis is conducted on the structural characteristics of ordinary and carbide hydraulic anchor so as to optimizeits structure to reduce its damage on casings. A formula for the extrusion stress on the casing at the biting position of carbide hydraulic anchors is derived based on material mechanics theory, and the casing deformation and extrusion stress at the biting position of ordinary hydraulic anchors is analyzed by using finite element method. It was demonstrated that casings are damaged at different degrees by ordinary and carbide hydraulic anchors. Ordinary hydraulic anchors will cause less radial deformation and extrusion stress on the casing than carbide hydraulic anchors under the same tubing pressure differential.Based on the analysis results, screw tooth design should be adopted in hydraulic anchors.When the tubing pressure difference is the same,extrusion stress exerted on the casings at the biting position of carbide hydraulic anchors decreases by power-law index with wedge angles and tooth diameters, but increases polynomially with anchor diameters and axial loads (in smaller amplitude), and increases exponentially with anchor tooth back angles gently. Results indicate setting the wedge angle at 10°, the anchor tooth diameter 10-12 mm and the anchor diameter 40-50 mm.Research provides a theoretical basis for the structure design of hydraulic anchors.
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Keywords:
- hydraulic anchor /
- structure parameters /
- casing /
- extrusion stress /
- casing deformation
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[1] Hailey T T,Donovan J F.Tubing-conveyed perforating with hydraulic set packers and a new high-pressure retrievable hydraulic packer[R].SPE 13372,1984.
[2] Hills Robert L,kilgore Marion D,Turner Will.Development of a high pressure, high temperature retrievable production packer[R].SPE 36128,1996.
[3] 刘汝福,王隆慧,韩进,等.水力锚对套管损伤数值模拟分析及结构优化[J].石油矿场机械,2004,33(5):65-67. Liu Rufu,Wang Longhui,Han Jin,et al.Numerical simulation analysis and structural optimization of hydraulic anchor casing damage[J].Oil Field Equipment,2004,33(5):65-67. [4] 张尚君,柴国兴,王登庆.新型压裂用防砂水力锚试验研究[J].石油矿场机械,2010,39(12):54-56. Zhang Shangjun,Chai Guoxing,Wang Dengqing.Experimental study of novel hydraulic fracturing anchor with avoiding sand[J].Oil Field Equipment,2010,39(12):54-56. [5] 陈振杰,陈伟.水力锚的防砂卡改造[J].石油机械,2002,30 (9):64-65. Chen Zhenjie,Chen Wei.Sand cards remodeling of hydraulic anchor[J].China Petroleum Machinery,2002,30(9):64-65. [6] 祝庆远.防卡水力锚的研制[J].石油矿场机械,2004,33(3):97-98. Zhu Qingyuan.Developing of hydraulic anchor with avoiding sands card[J].Oil Field Equipment,2004,33(3):97-98. [7] 李英,黎文才,崔绍江,等.Y241高压挤注封隔器的研制与应用[J].石油机械,2004,37 (9):173-174. Li Ying,Li Wencai,Cui Shaojiang,et al.Development and application of Y241 packer with high-pressure s queeze[J].China Petroleum Machinery,2004,37(9):173-174. [8] 邵想全,莫尚贤,陈忠,等.RTTS封隔器解卡方法探讨[J].油气井测试,2008,17(5):51-53. Shao Xiangquan,Mo Shangxian,Chen Zhong,et al.Methods solution of RTTS packer card[J].Well Testing,2008,17(5):51-53. [9] 张昌朝,逯玉亮,徐俊萍,等.超深井射孔测试联作技术在准噶尔盆地的应用[J].油气井测试,2011,20(6):44-45. Zhang Changchao,Lu Yuliang,Xu Junping,et al.Application of ultra-deep perforating testing combination technology in Junggar Basin[J].Well Testing,2011,20(6):44-45. [10] 于宗奎.异常高压低渗透地层测试技术的改进[J].油气井测试,2003,12(3):31-32. Yu Zongkui.Improvement of abnormal high pressure low permeability formations testing technology[J].Well Testing,2003,12(3):31-32. [11] 曹银萍,仝少凯,窦益华.试油封隔器水力锚剪切强度及咬入套管深度分析[J].科学技术与工程,2014,14(24):59-63. Cao Yinping,Tong Shaokai,Dou Yihua.Testing packer hydraulic anchor shear strength and bitten casing depth analysis[J].Science Technology and Engineering,2014,14(24):59-63. [12] 刘鸿文.材料力学:下册[M].北京:高等教育出版社,1992:212-214. Liu Hongwen.Mechanics of materials:part Ⅱ[M].Beijing:Higher Education Press,1992:212-214. [13] 窦益华,张福祥.高温高压深井试油井下管柱力学分析及其应用[J].钻采工艺,2007,30(5):17-20. Dou Yihua,Zhang Fuxiang.Mechanical analysis of testing tubing strings in high temperature high pressure deep wells and its application[J].Drilling Production Technology,2007,30(5):17-20. -
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