| 摘要: |
| 为保证高温高压条件下深水油气井固定型封隔器的坐封效果,基于深水高温高压井完井测试开井后松弛力、活塞效应、螺旋弯曲效应、鼓胀效应和温度效应对管柱的影响,建立管柱固定型封隔器失封判断方法,并研究相关因素的影响规律。利用改进的正交试验,对产量、坐封深度、松弛力、管柱热阻和环空液体性质等可控因素的敏感性及可行性进行研究。结果表明:封隔器在高温高压条件下存在较高的失封风险;不同可控因素对失封风险的控制效果不同,其中环空液体性质、产量、松弛力和坐封深度的控制效果依次递减;综合考虑措施可行性,应优化环空液体性质、坐封深度和松弛力,必要时采用隔热管等技术,并对产量进行调节,保证坐封效果。 |
| 关键词: 封隔器 完井测试 深水井 高温高压 正交试验 敏感性分析 |
| DOI：10.3969/j.issn.1673-5005.2019.03.007 |
| 分类号::TE 21 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(51574275)；“十三五”中国海洋石油总公司科技重大项目(CNOOC-KJ 135 ZDXM 24 LTD ZJ 01)；国家重点研发计划项目(2017YFC0804507) |
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| Failure and control of fixed down-hole packer in deepwater HPHT wells |
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GUAN Zhichuan, LI Cheng, XU Yuqiang, SHENG Yanan, ZHANG Bo, YAN Yan, MA Xianming
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(School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China)
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| Abstract: |
| In order to ensure the sealing effect of the fixed down-hole packer in deepwater oil and gas wells under high pressure and high temperature (HPHT) conditions, a method for assessing the failure of the packer was established, considering the effects of slack force, string movement, helical buckling effect, expansion of the string after well opening during well completion testing, and the relevant influencing factors were investigated. The sensitivity and feasibility of controllable factors were evaluated via improved orthogonal experiments, including production rate, the setting depth of the packer, the slack force, the thermal resistance of the string and the annular fluid properties. The results show that, the fixed packer has a high risk of sealing failure under HPHT condition, and the influence of the controllable factors can be ranked in the following order:the annular fluid properties, the production rate, the slack force and the setting depth. Taking a comprehensive consideration of the feasibility for measures to prevent packer failure, the annular liquid properties, the setting depth and slack force should be optimized to reduce the risk of the packer failure. If necessary, a thermal insulation tubing can be adopted, and the production rate can be adjusted to ensure the sealing effect. |
| Key words: down-hole packer well completion testing deepwater well high pressure and high temperature orthogonal experiments sensitivity analysis |
