Scientists propose new method to increase extraction of hard-to-recover hydrocarbons

phys.org | 6/4/2018 | Staff
chicana948 (Posted by) Level 3
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More than 40 percent of oil reserves in Russia are hard to recover. Scientists from the National Research Nuclear University MEPhI have proposed an effective method of increasing the production of such fields that does not harm the environment. Heating of a casing pipe by high-frequency electric current leads to melting of accumulated paraffin-resinous deposits.

Usually, extraction of difficult hydrocarbons requires the use of chemical reagents, heated steam, acoustic waves, and other methods. Specialists of MEPhI proposed a non-standard solution. A spiral coil of copper wire is placed into a casing pipe inside the well. A high-frequency current is passed through the coil, and the alternating magnetic field excites a strong current in the pipe, which heats its small section to a temperature of 120-150 degrees Celsius. Then the deposits on the internal walls fall off. Pumps evacuate it together with oil. Then the coil moves 15 cm higher or lower, heats another area, etc.

Capacity - Wells - Viscosity - Oil - Use

"Productive capacity of wells with high viscosity of oil can be increased without the use of expensive and environmentally hazardous methods," says co-author Alexey Ponomarenko.

According to Ponomarenko, existing methods are connected with huge energy costs. One technique is using a special reagent to induce a chemical reaction with the release of a large amount of heat. Here, energy consumption is lower, but the environmental consequences are more severe. Another option is to clean off scurfs from the inner surface of the pipe using remotely controlled scrapers; it is associated with high labor costs. This method leaves deposits inside the perforation holes as oil from the reservoir is "pressed" into...
(Excerpt) Read more at: phys.org
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