用连续管循环导热介质的井筒加热法

提出了一种以井筒加热为目的的稠油开采工艺。用连续管和空心抽油杆组成的导热介质的循环回路对油管中的流体进行加热,降低流体流动阻力。对两种不同的导热介质在普通连续管及隔热管在油管中和空气中的传热情况进行了研究,认为:使用隔热管可对油管中的流体进行有效的加热;在导热介质的入口温度要求不是太高的情况下,水也可作为导热介质,而且可能获得比使用高温导热油作为导热介质更佳的效果。用连续管循环导热介质的井筒加热工艺的设计应在保证油管中流体温度处处高于该井稠油的拐点温度的前提下,选择尽量短的隔热管以减小地面循环泵的负荷。

HEATING WELLBORE: USE COILED TUBING/HOLLOW ROD TO CIRCULATE THE HEAT CONDUCTION MEDIA

This paper presents a technology of producing heavy oil by means of heating wellbore. The circulating system of the heat conduction media used to heat the fluid in the tubing is composed of coiled tubing and hollow rod, and the heating of the fluid can effectively reduce the resistance to flow. This paper studies the heat transfer of 2 heat conduction media in the conventional coiled tubing and in the adiabatic tubing. The study results indicate: the fluid in the tubing can be heated effectively by use of the adiabatic tubing. When the requirements to the entrance temperature of the heat conduction media is not serious, water can also be used as the media, and better effect can perhaps be achieved compared to that when the high temperature heat conduction oil is used as the media. This paper also points out: apart from ensuring the temperature of the fluid in the tubing higher than the inflection point of the heavy oil in the wellbore, the adiabatic tubing should be chosen as short as possible, so as to reduce the load of the pump on the ground.