Dewaxing of wells

Well dewaxing equipment

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Well dewaxing equipment

Well dewaxing is the process of removing paraffin (waxy) deposits from oil wells and pipeline systems. These deposits can significantly reduce oil production efficiency, interfere with normal product flow and cause other operational problems. Dewaxing is an important procedure in industrial environments because paraffin deposits can lead to reduced pipe flowability, increased pressure on pumps and, consequently, shorter equipment life.

Basic principles of dewaxing
1. Causes of paraffin formation:
- Temperature changes leading to crystallisation of paraffin in oil.
- Composition of oil, which contains significant amounts of paraffin hydrocarbons.
- Pressure and other physico-chemical factors.
2. Principle objectives:
- Removal of pre-existing paraffin deposits.
- Prevention of re-generation of paraffin.

Dewaxing methods

Mechanical methods:

- Pigs and grinders: used to physically remove wax from the inner walls of pipes. Specialised pigs are passed through pipelines to remove hard deposits.
- Sandblasting: involves the application of high-pressure liquid jets with sand or other abrasive materials.
Thermal methods:

- Steam well heating: steam is injected into the well to melt the wax. The powerful steam flow warms the pipe walls and equipment surface.
- Hot flushing fluids: pumping hot biological or chemical solutions through the system.
Chemical methods:

- Wax solvents: special chemicals that dissolve wax. Flushing with such solutions can be done periodically to remove accumulated deposits.
- Wax inhibitors: substances added to the oil that prevent wax crystallisation.
Electromagnetic and ultrasonic methods:

- Electromagnetic heating: application of electromagnetic fields to melt wax deposits.
- Ultrasonic treatment: liquefaction of wax using high frequency sound waves.

Importance of dewaxing

Improving the functionality of wells:

- Ensuring continuous oil flow without obstacles.
- Reduction of hydraulic resistance in pipelines.
Increasing the service life of wells and equipment:

- Reduces wear and strain on pumping and other equipment.
- Prevent pipe diameter reduction, which reduces system pressure and improves operating conditions.
Improving overall efficiency:

- Maintaining a stable level of oil production.
- Reducing operating costs by reducing the number of unscheduled shutdowns and repairs.
- Improving economic performance by increasing the output oil flow and reducing losses.

Continuous monitoring of oil temperature and composition, allowing timely adjustment of the well operation mode.
Installation of devices to maintain a constant temperature: e.g. heaters on the well and in the pipework.
Periodic use of inhibitors and solvents: to keep pipes clean and prevent new deposits from forming.

Thus, well dewaxing is a complex multi-stage process that requires application of various methods and technologies. Timely performance of these procedures ensures stable operation of oil facilities, extends their service life and significantly improves economic efficiency of production.

Dewaxing of wells

Well dewaxing equipment

Well Dewaxing Unit

Bladed scrapers

Spear-type scrapers

Smarts of sliding

Milling scrapers

Wax cutter

Rope socket

Dewaxing methods

Importance of dewaxing

FAQ