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| 基于自相似模型的气井管柱中流体的近壁压力试验研究 |
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刘铭刚1,2,闫怡飞2,3,谢巍4,王建军5,韩生超1,2,杨秀娟1,2,闫相祯1,2
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(1.中国石油大学储运与建筑工程学院,山东青岛 266580;2.中国石油大学油气CAE技术研究中心,山东青岛 266580;3.中国石油大学机电工程学院,山东青岛 266580;4.华北油田采油工程研究院,河北任丘 062552;5.中国石油集团石油管工程技术研究院,陕西西安 710077)
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| 摘要: |
| 气井管柱内流体运动状态和近壁压力分布的确定对井筒安全和完整性评价有重要意义。从相似性原理出发设计气井管柱流体力学试验,通过尺寸比尺和流速控制实现模型与原型的几何相似和雷诺数自相似,采用试验和数值计算对气井造斜弯曲段管柱近壁压力进行对比研究,利用相对误差分析验证试验的可行性。结果表明:气井管柱室内流体试验满足雷诺数自相似下的几何相似条件;当取运动黏度为试验不变量时,管柱近壁压力的试验模拟结果与数值计算结果相比偏小,当试验压差为0～20 MPa时,近壁压力最大相对误差为4.12％,且压差越大,相对误差越小;随着生产压差(pp=5～20 MPa)和油管内径(D=76.00～157.08 mm)的增大,管柱整体近壁压力和沿程压力降增大;造斜弯曲段流入端的局部压程比随油管内径增大而增大,流出端规律相反。满足几何相似和雷诺自相似条件的管柱流体试验是气井管柱近壁压力研究的有效手段。 |
| 关键词: 管柱 流体试验 近壁压力 相似理论 储气库 |
| DOI：10.3969/j.issn.1673-5005.2017.02.018 |
| 分类号::TE 38 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(51274231,8,U1262208);中央高校基本科研业务费专项 (15CX06067A);国家油气重大专项 (2016ZX05017-003-01);中石油“十三五”基础课题 (2016A-3905) |
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| Experimental study on near-wall-pressure in gas well tubing based on self-similar theory |
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LIU Minggang1,2, YAN Yifei2,3, XIE Wei4, WANG Jianjun5, HAN Shengchao1,2, YANG Xiujuan1,2,YAN Xiangzhen1,2
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(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.Oil and Gas CAE Technology Research Center in China University of Petroleum, Qingdao 266580, China;3.College of Electromechanical Engineering in China University of Petroleum, Qingdao 266580, China;4.Petroleum Production Engineering Research Institute of Huabei Oilfield Company, Renqiu 062552,China;5.CNPC Tubular Goods Research Institute, Xi 'an 710077, China)
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| Abstract: |
| The flowing state and pressure distribution near the wall of the wellbore plays an important role in the safety and integrity assessment of gas wells. An indoor small-scale testing experiment is designed to study the flowing state in the column based on the similarity principle. The geometrical similarity between the model and the prototype, and the Reynolds number self-similarity are both realized by the size scale and velocity control. The comparative analysis in use of experimental and numerical methods is performed to study the near-wall-pressure in the bending area of the tube, and the feasibility of the experiment is verified by the relative error analysis. The result shows that, the experiment satisfies the geometry similar conditions and self-similarity of Reynolds number. The experimental results of the near-wall-pressure is smaller than the numerical simulation result when the kinematics viscosity is taken as an invariable. The maximum experimental error is 4.12％ when the working pressure is less than 20 MPa and the experimental error decreases with the increase of the working pressure. With the increase of the production pressure (pp=5 ～ 20 MPa) and the tubing diameter (D=76.00 ～ 157.08 mm), the near-wall-pressure and pressure-fall of the tubing also increase. The pressure-distance rate of the inflow end in the bending segment increases with the increase of the deviation angle and tubing diameter, while that of the outflow end is on the contrary. Conclusions can be drawn that the fluid in tubing experiment satisfying the geometric similarity and Reynold self-similarity is an efficient way to investigate the near-wall-pressure. |
| Key words: tubing fluid experiment near-wall-pressure similarity theory underground gas storage |
