| 套管封固段变形对高温高压井环空圈闭压力影响规律 |
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| 引用本文： | 董星亮,刘书杰,谢仁军,张兴全. 套管封固段变形对高温高压井环空圈闭压力影响规律[J]. 石油钻采工艺, 2016, 38(6): 782-786. DOI: 10.13639/j.odpt.2016.06.013 |
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| 作者姓名： | 董星亮 刘书杰 谢仁军 张兴全 |
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| 作者单位： | 1.中海石油中国有限公司 |
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| 摘 要： | 高温高压井在钻井及生产过程中,由于密闭环空流体受热膨胀产生的环空圈闭压力严重影响着气井的安全,环空圈闭压力大小与密闭环空体积变化密切相关。为研究套管封固段变形对环空圈闭压力的影响,根据弹性变形理论,在建立套管— 水泥环—地层协调变形模型的基础上,综合考虑环空流体参数、套管变形等因素,建立了多管柱环空圈闭压力计算模型,结合实际案例分析了套管变形对环空圈闭压力的影响规律。研究表明考虑套管封固段变形预测的环空圈闭压力值较不考虑该因素时降低约13%,且与现场实测值更接近。该研究对于指导高温高压井的套管柱设计及安全生产有重要的现实意义。
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| 关 键 词： | 高温高压井 环空圈闭压力 固井段 套管变形 环空体积变化 |
| 收稿时间： | 2019-05-21 |
Casing deformation of cemented portions effect on the annular pressure buildup for hthp gas wells |
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| Affiliation: | 1.China National Offshore Oil Corporation, Beijing 100010, China2.CNOOC Research Institute , Beijing 100028, China |
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| Abstract: | During the drilling and production of HTHP (high temperature and high pressure) well, its safety is seriously influenced by the annulus trap pressure which is induced by the closed annulus fluid due to thermal expansion. And the annulus trap pressure is in close relation with the closed annulus volume change. In order to analyze the effect of the deformation of casing cementing section on the annulus trap pressure, a casing-cement sheath-strata compatible deformation model was established according to the elastic deformation theory. Then, a multi-string annulus trap pressure calculation model was developed by analyzing annulus fluid parameters and casing deformation comprehensively. Finally, a case study was carried out to analyze the influence laws of casing deformation on annulus trap pressure. It is shown that when the deformation of casing cementing section is taken into account, the predicted annulus trap pressure is 13% lower and it is closer to the field measurement. This research plays an important and practical role in guiding the casing string design and safe production of HTHP wells. |
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