Electric heater of re-production of long shutoff thick oil and high viscosity oil well

Abstract

This is an electric heater for production resume of heavy oil well after long terms of inactivity. The heating unit to the heater shell is composed by six spiral resistance wires in series connection and posited against the shell wall parallel to the shell axis. The wires are put in conductor pipes which are separated by MgO powder. The wires are evenly distributed along the shell wall. The bottom of the inner shall is covered by a layer of alloy alumina. The wire connection parts are covered by a seal of epoxide resin. There is a layer of epoxide resin on the shell top section. The other parts of the shell are filled with MgO powder.

Description

1. Technical field [0001] The invention relates to an electric heating device, in particular to a high-voltage, high-power, high-density electric heating device for heavy oil and high-condensation oil long-stop well production resumption. 2. Background technology [0002] Russia, China, Canada, the United States, Venezuela, Indonesia and other countries have proven a large number of heavy oil deposits, and many petroleum experts pointed out that the reserves of heavy oil deposits in the world are equivalent to those of thin oil deposits, or the reserves of heavy oil are more. There are many heavy oil components in the proven oil deposits in my country, some of which have a freezing point exceeding 40°C. For example, Liaohe Oilfield is particularly rich in heavy oil and high pouring oil reserves, which are called "immobile oil fields". Most of the heavy oils and high pouring oils in the oilfield contain up to 50% wax, and the highest freezing point reaches 67°C (super heavy o...

AI Technical Summary

Problems solved by technology

Its problems are: 1. The heating efficiency is low, which cannot solve the problem of resuming production of long-term shutdown wells

Due to the low thermal conductivity of magnesium oxide powder, the heat transfer rate is slow and takes a long time; The outer diameter of the tube is ф120mm, ф80mm and ф70mm, which are respectively suitable for ф177.8mm, ф139.7mm and ф127mm casing, and the length is 10m). Slow temperature rise

2. The 10m-long electric heating tube brings inconvenience to the oil fishing operation

The body of the electric heating tube is too long, which is inconvenient for the lifting operation of the oil trolley

3. This type of electric heating tube also has the problem of short life

Its service life is only about 60 hours

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