The utility model relates to a double hollow string which can adjust the circulating temperature of hot water. The double hollow string is integrally inserted in the oil tube of an oil well. The double hollow string includes an inner tube and an outer tube, the bottom end of the outer tube is closed, the inner tube sleeve is arranged inside the outer tube, there is a annulus space between the inner tube and the outer tube, and there is a channel connecting the annulus space between the bottom end of the inner tube and the bottom end of the outer tube; on the tube wall of the inner tube The valve body is provided with one-way conduction from the inner pipe to the annulus space. According to the double hollow string of the utility model, a one-way through valve body is installed on the inner tube wall of the lowest temperature point depth position of the wellbore temperature field, the hot water in the inner tube directly flows into the annulus space at the depth position through the way of wellhead pressurization, so that the circulating water in the annulus space at the position can reach the secondary heating, so as to improve the temperature of the lowest temperature point of the wellbore; the hot water at a certain wellhead Under the condition of water temperature, the crude oil can be evenly heated in the whole wellbore, and the temperature can be kept above the freezing point of crude oil, so as to realize low-cost and efficient development.
【技术实现步骤摘要】
可调节热水循环温度的双空心管柱
本技术是关于高凝油、稠油开采领域中一种辅助调节热水循环以保证井筒产出液温度的装置,尤其涉及一种可调节热水循环温度的双空心管柱。
技术介绍
在当前“开源节流、降本增效”的大形势下,双空心管柱热水循环技术作为一种新型防蜡降粘技术,具有成本低、工艺实施简单等优点,得到了较为广泛的应用;其结构为:外管底端封闭,内管套设在外管内部,内管与外管之间具有环空空间,内管底端与外管底端之间具有连通环空空间的通道;将双空心管柱整体插设在油井的油管中,双空心管柱插设深度根据采油的具体情况而定;其原理为利用地面加热炉将循环水加热至所需温度,由循环泵将热水以一定流速从内管顶端注入,热水在内管底端又流入环空空间并从环空空间上端通过外管流出双空心管柱;其中,热水是在内管及环空空间中循环,并与油管内的地层产出流体进行热交换,由此提高产出液温度,实现稠油、高凝油的有效举升。但是,现有的双空心管柱热水循环技术在生产过程中,出现了一些问题,如:伴热井段温度分布不均匀,存在温度“波谷”点,也就是说,在井筒温场分布中存在温度低点,例如:在双空心管柱下入深度1150m,井口热水温度80℃的条件下,则在深度为700m处油管内地层产出流体存在温度最低点,温度大约47.5℃(通过计算得到,如图3所示);如果这个温度最低点低于油管内原油凝固点,则需要将井口注入热水温度进一步提高,也就是说此时需要地面燃气锅炉将热水温度进一步提高,这样就造成了燃气锅炉耗气量升高,无法实现低成本高效开发。由此,本专利技术人凭借多年从事相关行业 ...
【技术保护点】
1.一种可调节热水循环温度的双空心管柱,双空心管柱整体插设在油井的油管中,双空心管柱包括有内管和外管,外管底端封闭,内管套设在外管内部,内管与外管之间具有环空空间,内管底端与外管底端之间具有连通环空空间的通道;其特征在于,在内管的管壁上设有由内管向环空空间单向导通的阀体。/n
【技术特征摘要】
1.一种可调节热水循环温度的双空心管柱,双空心管柱整体插设在油井的油管中,双空心管柱包括有内管和外管,外管底端封闭,内管套设在外管内部,内管与外管之间具有环空空间,内管底端与外管底端之间具有连通环空空间的通道;其特征在于,在内管的管壁上设有由内管向环空空间单向导通的阀体。
2.如权利要求1所述的可调节热水循环温度的双空心管...
【专利技术属性】
技术研发人员:蔡龙浩,李博,郑健,于宝石,杨景堂,梁晨辉,李鑫,孙艺,李特,李俊杞,石兴灏,方梁锋,李昕宇,陈瑶,仲超,何远哲,朱涛,
申请(专利权)人:中国石油天然气股份有限公司,
类型:新型
国别省市:北京;11
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