考虑环空热膨胀压力分析高温高压气井井口抬升

发布时间：2018-05-18 06:14

本文选题：高温高压气井 + 环空热膨胀压力　；参考：《工程热物理学报》2017年02期

【摘要】：对高温高压气井,井筒流体高速开采过程中产生的井口热应力和环空热膨胀压力会导致井口装置抬升,破坏气井井筒完整性。本文建立了环空热膨胀压力和井口抬升计算模型,结合某高温高压气井进行了实例分析。结果表明:环空热膨胀压力随着环空温差和流体热膨胀系数的增加呈线性增加,随环空流体等温压缩系数的增加呈线性减小;C环空热膨胀压力产生的井口热应力最大,A环空最小;单层套管存在自由段时,井口抬升随着环空热膨胀压力的增加呈非线性增加,当自由段长度相同时,井口抬升对C环空热膨胀压力最敏感;多层套管同时存在自由段时,环空热膨胀压力不会改变多层套管自由段长度对井口抬升高度的影响规律,但会导致井口抬升高度增大。
[Abstract]:For high temperature and high pressure gas wells, the wellhead thermal stress and annulus thermal expansion pressure produced during the high speed production of wellbore fluid will lead to the wellhead device uplift and destroy the wellbore integrity. In this paper, a calculation model of thermal expansion pressure and wellhead uplift in annulus is established, and an example of a high temperature and high pressure gas well is analyzed. The results show that the thermal expansion pressure increases linearly with the increase of the ring temperature difference and the coefficient of thermal expansion of the fluid. With the increase of the coefficient of isothermal compression of annular fluid, the maximum thermal stress of wellhead and the minimum of annulus caused by thermal expansion pressure in annulus are linearly reduced, and the wellhead uplift increases nonlinearly with the increase of thermal expansion pressure in annulus with the existence of free section of single-layer casing. When the length of the free section is the same, the wellhead uplift is the most sensitive to the C annulus thermal expansion pressure, and when the multilayer casing exists at the same time, the annulus thermal expansion pressure will not change the influence law of the multilayer casing free section length on the wellhead uplift height. However, it will increase the wellhead uplift height.
【作者单位】： "油气藏地质及开发工程"国家重点实验室·西南石油大学;
【基金】：国家自然科学基金(No.51244007) 国家科技重大专项”大型油气田及煤层气开发”(No.2011ZX05023-004) 四川省省属高校科技创新团队建设计划(No.13TD0026)
【分类号】：TE31

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