Oil pipe preheating and washing system

Abstract

The oil pipe preheating and washing process and apparatus is for cleaning old oil pipe in oil field. The oil pipe preheating and washing process includes arranging oil pipes, heating the oil pipes with one outer far infrared heater to temperature over 18deg.c, and washing oil pipes with outer cleaning machine and inner cleaning machine. The outer cleaning machine includes a frame, a brushing mechanism, a cantilever mechanism and a regulating mechanism connected together. The inner cleaning machine includes an inner cleaning head and a powered flushing mechanism connected together, and the inner cleaning head has nozzle and outer scraper. The outer far infrared heater includes a heating furnace and a far infrared generator.

Description

technical field [0001] The invention belongs to a maintenance process and a maintenance device for oil pipes in the petroleum industry, in particular to a preheating and cleaning system for oil pipes, which is used for cleaning old oil pipes recovered from oilfield operations. Background technique [0002] In the petroleum industry, tubing is the most common downhole tool, and its usage is large, which directly affects the cost of oil recovery. It is an effective way to reduce production costs to recycle the recovered old oil pipes after cleaning. However, the cleaning of old oil pipes has always been a major problem plaguing oil field oil pipe repair manufacturers, and it is also the main cost item for repairing oil pipes. How to improve the quality of oil pipe cleaning and reduce the cleaning cost has been a long-term painstaking research project of various oil pipe repair and related units. For many years, the old oil pipes with oil stains recovered from the wells in do...

AI Technical Summary

Problems solved by technology

For many years, the old oil pipes with oil stains recovered from the wells in domestic oil fields are mainly cleaned by the traditional chemical boiling method. This technology has many disadvantages: it needs a huge heating system for continuous heating, and the temperature in the cleaning pool is as high as 90 °C. Large heat loss and high cost of use; a large amount of chemical cleaning agent needs to be added, the environment is seriously polluted, the working conditions are harsh, and the discharge of cleaning fluid is limited; the cleaning effect of the oil pipe is affected by comprehensive factors such as ambient temperature, cleaning solution concentration temperature, and flushing pressure. hard to control

[0003] In recent years, the high-pressure water jet tubing cleaning process has been popularized in oil fields. Several years of practice have proved that: affected by the ambient temperature of the oil field, the high-pressure water jet cleaning process is performed from mid-October to early April of the following year, and the temperature is lower than 18°C. When it cannot be used normally, production must be stopped; the pressure of the high-pressure water jet process is as high as 40MPa, the total power of the equipment is as high as 405.4kW, and the operating cost is high; the supporting technology of high-pressure water jet cleaning is immature, the failure rate is high, and equipment maintenance is difficult. unfavorable

[0004] At the same time, intermediate frequency heating, electric heating and other cleaning technologies, see "New Technology and New Process" No. 9, 2004, pages 54-56, are all complicated in equipment and high in energy consumption, and cannot be mass-produced, so they have not been popularized and applied.

The most important thing is that none of the above methods has fundamentally solved the problem of incomplete cleaning of oil pipes, especially key parts such as threaded buckles and couplings. If the cleaning is not thorough, it is directly related to whether the inspection and repair process can be realized, which seriously affects the repair of oil pipes. quality

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