电热杆在稠油举升工艺中的应用

螺杆泵采油工艺下泵深度有一定限制,而电热杆采油工艺适应范围广,泵挂下深不受限制,且能连续加热,为此,进行了电热杆采油工艺研究。根据电热采油工艺原理和技术指标,从选井、选择加热深度、选择加热功率、选择工作制度几个方面进行了电热杆采油工艺设计,在研究过程中主要应用了螺杆泵、管外电缆、变频加热器、电磁加热器及电热杆等工艺。现场试验表明,该工艺解决了稠油在井筒内流动困难的问题,加热效率高,使用寿命相对较长,能耗相对较低,是值得推荐与推广的稠油举升工艺之一,同时在应用中也发现该工艺还存在三相电不平衡及能耗高等问题需要改进与提高。

Application of heating sucker rod to heavy crude lifting

Research on oil production process by using heating sucker rod is conducted,since downhole pump depth of screw pump production process is to certain extent limited,oil production process using heating sucker rod is widely applied,there is no limit on pump setting depth and it can be continually heated.According to the principle and the technical index of electrothermal oil recovery process,oil production process using heating sucker rod is designed by taking selection of wells,heating depth,heating power,and working system into account.During the process of study,such processes as the screw pump process,the process of cables outside pipes,the process of heaters with variable frequency,the process of electromagnetic heaters,and the process of heating sucker rods.Field test shows that the new process can be used to solve the difficulties of heavy crude flow in borehole,improving heating effect,relatively prolong service life,and decrease energy consumption.It is valuable to be popularized in current situation.Meanwhile,the process has some disadvantages such as unbalanced three-phase voltage and high energy consumption which need to be improved further.