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.