Downhole Electric Heating Steam Generator

Abstract

The invention provides an underground electrical-heating steam generating device. The underground electrical-heating steam generating device specifically comprises an oil pipe, a pump barrel, an electrical-heating steam generator and a heat spiral pipe. The electrical-heating steam generator comprises a hollow pipe, a cover, an upper shell cover plate, a lower shell cover plate and a shell. According to the generating device, the oil pipe, the pump barrel and the hollow pipe are sequentially connected from top to bottom; the lower end of the oil pipe is sleeved with the upper end of the cover, and the lower end of the cover is connected with the upper end of the shell; a water injecting opening is formed in the portion, between the upper end of the cover and the pump barrel, of the oil pipe; the pump barrel and the heat spiral pipe are covered with the cover and the shell; the upper shell cover plate is arranged between the lower end of the cover and the upper end of the shell and used for separating the space in the cover from the space in the shell, and a water inlet is formed in the upper shell cover plate; the lower shell cover plate is arranged at the lower end of the shell and provided with a steam outlet; the heat spiral pipe is wound around the hollow pipe, one end of the heat spiral pipe is connected with the water inlet, the other end of the heat spiral pipe is connected with the steam outlet, and the heat spiral pipe is used for converting injected running water into hot steam.

Description

technical field [0001] The invention relates to a downhole electric heating steam generator for thermal recovery of heavy oil, in particular to a downhole electric heating steam generator suitable for steam huffing and puffing. Background technique [0002] For thermal recovery of heavy oil, steam dryness has always been the main bottleneck restricting steam huff and puff, steam flooding and SAGD. Since the 1970s, research and use of downhole steam generators have begun. At present, there are generally two types of downhole steam generators. One is the downhole fuel combustion steam generator with the same principle as the surface steam generator, including high-pressure combustion direct heat exchange type and low-pressure combustion indirect heat exchange type. At present, the more feasible high-pressure combustion direct heat exchange type Heat exchange type downhole steam generator, the second is downhole electric heating steam generator, there are three kinds of device...

AI Technical Summary

Problems solved by technology

[0003] The patent 201410040391.X downhole electric heating steam generator in the prior art is only suitable for steam flooding and SAGD. When steam huffing and puffing is used for steam injection and steam injection, the pore size is too small, so it is easy to block the flow of heavy oil into the tubing. At the same time, its straight-through electric heating Fluid heating temperature is limited due to the short distance of the tube

The two types of electric heating strings mentioned in the paper "Research on Downhole Electric Steam Generator Technology for Heavy Oil Thermal Recovery" are not suitable for steam huffing and puffing after soaking the well and blowing out directly. They can only be lifted and lowered to increase operating costs

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