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| 稠油热采井套管柱应变设计方法 |
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王建军1,2,杨尚谕1,2,薛承文3,韩礼红1,2,王航1,2
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(1.中国石油集团石油管工程技术研究院,陕西西安 710077;2.石油管材及装备材料服役行为与结构安全国家 重点实验室,陕西西安 710077;3.中国石油新疆油田公司工程技术研究院,新疆克拉玛依 834000)
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| 摘要: |
| 为解决稠油热采井不断出现的套管损坏现象,改变传统的管柱强度设计方法。基于弹塑性力学理论,在满足套管柱强度设计的基础上建立套管柱应变计算模型;通过对比套管材料应变与结构应变,借助Rambery-Osgood模型得到应变安全系数最小值,提出套管柱应变设计的理论判据,形成套管柱应变设计方法。结果表明,该设计方法在西部油田8口稠油热采井Φ177.8 mm×8.05 mm TG80H特殊螺纹套管柱设计中得到应用,生产4轮次后套管柱未出现变形和泄漏现象,经过14轮次后,套管服役性能依然良好,新热采井套管柱应变设计方法允许套管在可控范围内变形,可有效延长套管使用寿命,降低套损率。 |
| 关键词: 稠油 热采井 套管柱 应变设计 设计准则 |
| DOI：10.3969/j.issn.1673-5005.2017.01.020 |
| 分类号::TE 22 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(51574278);中国石油天然气集团公司项目(2015E-4006);陕西省自然科学基础研究计划项目(2013KJXX-07) |
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| Strain design method for casing strings in heavy oil thermal recovery well |
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WANG Jianjun1,2, YANG Shangyu1,2, XUE Chengwen3, HAN Lihong1,2, WANG Hang1,2
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(1.CNOPC Tubular Goods Research Institute, Xi 'an 710077, China;2.State Key Laboratory for Performance and Structural Safety of Petroleum Tubular Goods and Equipment Materials, Xi 'an 710077, China;3.Engineering Technology Research Institute of Xinjiang Oilfield Company, Karamay 834000, China)
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| Abstract: |
| Considering the fact that casing damage becomes more and more serious in steam injection wells, the traditional string strength design method needs to be changed. According to the elasto-plastic mechanics theory, the strain calculation model of the casing string was established on the basis of casing strength design. The minimum value of the strain safety factor was given by comparing the casing material strain and structural strain in use of the Ramberg-Osgood model, and the theoretical criterion of strain design on casing strings was then proposed. The result shows that, when this design method was applied in Φ177.8 mm×8.05 mm TG80H premium thread casing strings, the leakage and deformation phenomena did not appear after 4 rounds steam stimulation. Moreover, the performance of the casing strings kept very well even after 14 rounds. The new strain design method on casing strings in the thermal recovery well admits their deformation in a controllable range, and it can effectively extend the lifetime and lower the damage probability of casing strings. |
| Key words: heavy oil thermal recovery well casing string strain design design criteria |
