Research on Rubber Cylinder of Pressure Partition Packer in Double-gradient Drilling Casing
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摘要: 双梯度钻井技术可解决深海油气和浅层水合物开发面临的疏松表层安全钻进和地层漏失压力低等难题。为研究双梯度钻井套管内压力隔断封隔器胶筒的力学性能,利用有限元仿真软件,分析不同摩擦因数、胶筒厚度、工作压力、环空间隙等因素作用下对胶筒变形的影响。采用正交试验对四种因素作用下胶筒的最大Mises应力值与接触压力值进行极差分析。结果表明:摩擦因数为0.3时胶筒与套管间接触压力取得较大值,双梯度钻井封隔器胶筒厚度优选为15 mm;在有效封隔2 MPa工作压力前提下,得出封隔器胶筒随钻柱滑动的最小摩擦力33 845 N;影响胶筒最大Mises应力的主要因素为工作压力与环空间隙,影响胶筒与套管间最大接触压力的主要因素为工作压力与胶筒厚度。Abstract: The double-gradient drilling technology can be used to solve the problems in the development of deep-sea oil and gas and shallow gas hydrate, and the low pressure of the formation leakage and the like. In order to study the mechanical properties of the pressure-blocking packer rubber tube in the double-gradient drilling casing, the effects of different friction coefficient, thickness of the rubber tube, working pressure, ring space and other factors on the deformation of the rubber cylinder were analyzed by means of the finite element simulation software. The maximum Mises stresses value and the contact pressure value of the rubber tube under the four factor groups were analyzed with the orthogonal test. The results show that the contact pressure between the rubber tube and the casing can be obtained with a friction coefficient of 0.3, the thickness of the rubber tube of the double-gradient drilling packer is preferably 15 mm, and the minimum friction force of the packer rubber tube with the drill string is 33 845 N under the condition of effective sealing of the working pressure of 2 MPa. The main factors that affect the maximum Mises stresses of the rubber tube are the working pressure and the ring space; and the main factors that influence the maximum contact pressure between the rubber tube and the casing are the working pressure and thickness of the rubber tube.
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表 1 胶筒材料参数
弹性模量/MPa 泊松比 C10/MPa C20/MPa C30/MPa 5.13 0.48 1.719 -6.395 20.728 表 2 封隔器尺寸参数
mm 胶筒外径 套管内径 中心管外径 胶筒内径 190.5 220.5 92 160.5 表 3 多因素正交设计参数表
因素 摩擦因数μ 胶筒厚度/mm 工作压力/MPa 环空间隙/mm 水平1 0.1 15 5 15 水平2 0.2 20 10 20 水平3 0.3 25 15 25 水平4 0.4 30 20 30 表 4 试验设计安排和结果
因素 摩擦因数μ 胶筒厚度/mm 工作压力/MPa 环空间隙/mm 最大Mises应力/MPa 最大接触压力/MPa 试验1 1(0.1) 1(15) 1(5) 1(15) 32.9 4.59 试验2 1 2(20) 2(10) 2(20) 65.15 9.40 试验3 1 3(25) 3(15) 3(25) 88.63 14.18 试验4 1 4(30) 4(20) 4(30) 105.1 18.70 试验5 2(0.2) 1 2 3 55.81 9.50 试验6 2 2 1 4 61.34 4.28 试验7 2 3 4 1 70.04 19.36 试验8 2 4 3 2 53.47 14.07 试验9 3(0.3) 1 3 4 160 14.34 试验10 3 2 4 3 134.4 19.26 试验11 3 3 1 2 59.71 4.28 试验12 3 4 2 1 44.75 9.23 试验13 4(0.4) 1 4 2 139.3 19.75 试验14 4 2 3 1 63.98 14.43 试验15 4 3 2 4 77.39 9.05 试验16 4 4 1 3 43.70 4.04 表 5 最大Mises应力极差分析
因素 摩擦因数μ 胶筒厚度/mm 工作压力/MPa 环空间隙/mm X1 291.78 388.01 197.65 211.67 X2 240.66 324.87 243.1 318.23 X3 398.86 295.77 366.08 322.54 X4 324.37 247.02 448.84 403.83 Y1 72.95 97.00 49.41 52.92 Y2 60.17 81.22 60.78 79.56 Y3 99.72 73.94 91.52 80.64 Y4 81.09 61.76 112.21 100.96 极差R 39.55 35.24 62.8 48.04 表 6 最大接触应力极差分析
因素 摩擦因数μ 胶筒厚度/mm 工作压力/MPa 环空间隙/mm X1 46.87 48.18 17.19 47.61 X2 47.21 47.37 37.18 47.5 X3 47.11 46.87 57.02 46.98 X4 47.27 46.04 77.07 46.37 Y1 11.72 12.05 4.3 11.90 Y2 11.80 11.84 9.3 11.88 Y3 11.78 11.72 14.26 11.75 Y4 11.82 11.51 19.3 11.59 极差R 0.1 0.54 15 0.31 -
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