Electrothermal complex with downhole electrical heating generators for enhanced heavy oil recovery

摘要

Numerous theoretical researches and practical experiments prove that among all increasing oil recovery methods the thermal methods are the most effective. Nowadays it is often used thermal technology of steam injection from the surface steam generator through heat-insulated tube string into the well. This technology has a several disadvantages - low steam quality in well, high capital cost and etc. For heat producing inside the well the downhole electrical heating generators have been designed. This paper provides two such devices - electrical heating device and electrical steam generator. Construction of the electrical heating device is made for well bottom zone heating, whereas electrical steam generator could provide steam flooding, cyclic steam stimulation, impulse-dozen heat stimulation and other modes. Main advantages of this devices are high steam quality (steam dryness is almost 0, 8-1), low capital cost, ecological safety. Besides, paper shows calculation technique for main parameters of downhole heating generators in dependence of initial geological and technology conditions.