井口抬升现象危害十分严重,影响油井正常生产寿命和产量,甚至导致油气井关停,同时对井控风险极大.在介绍H1井井身结构和固井工艺的基础上,采用WellCat软件建立了井口抬升分析模型,基于井筒温度剖面和自由套管热载荷伸长量模拟计算了井筒抬升量,并结合抬升原因给出了复产措施.分析结果表明:H1井井口抬升的主要原因是(o)244.48 mm套管自由段过长,产量升高后,在热应力作用下套管伸长,产生上顶力导致了井口抬升现象.给出了3种有效的复产措施:即对自由套管段挤水泥封固、限定产量生产及生产管柱采用隔热油管.可为解决稠油热采井的井口抬升问题提供了参考.%The wellhead rising phenomenon is very harmful, which has a strong impact on the normal service life and production of oil wells, and even causes the oil and gas wells to shut down, and presents great risk on well control.The wellbore configuration and cementing technology of Well H1 has been introduced.The wellhead rising analysis model has been established by using WellCat software.The wellhead rising has been calculated based on the wellbore temperature profile and the thermal stress elongation of free casing.And reproduction measures have been proposed based on the wellhead rising reasons.The results show that the main reason for the wellhead rising is that the free section of (o)244.48 mm casing is too long.When the production increases, the casing is elongated under thermal stress, resulting in the wellhead rising by the consequent uplifting force.Three effective reproduction measures have been proposed: squeezing cement slurry in free casing section to cement the casing;limiting the production rate and applying insulated tubing for production string.The conclusion could provide references for addressing the issue of wellhead rising of heavy oil thermal recovery well.
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