METHOD OF OIL-FIELD PIPES CLEANING AND A PLANT FOR ITS REALIZATION Russian patent published in 2004 - IPC

FIELD: oil-field pipes cleaning from petroleum pollution.

SUBSTANCE: the group of inventions is dealt with the area of oil-field pipes cleaning from pollution, mainly of petroleum nature, from asphaltic-tar-paraffinaceous solid sediments and may be used for cleaning of the oil-well tubing inner and outer surfaces. The method provides, that the oil-well tubing subjected to cleaning are previously build up with orientation of their coupling butts in one direction, gathered them in blocks with a collateral location of their axes, placed in the chamber of cleaning, where they are exposed to treatment with a supersonic high-temperature air-gas stream. The stream is directed to the butt of the block with a coupling butts. The stream cross-sectional area is chosen in 1.2-2 times as mach as the cross-sectional area of the block of the tubing. The purified pipes are removed from the zone of cleaning. At that the tubing treatment is conducted stage by stage. For the purpose the blocks of tubing first for three minutes are exposed to a preheating by an air-gas stream up to the temperature of paraffin melting point with simultaneous cleaning of the tubing outer surface by the air-gas stream saturated with a grinding material, supplied perpendicularly to the tubing axes along the full their length through the longitudinal slit type holes located opposite to each pipe at a high preset speed and the low given temperature of the stream, then for one minute - with the speed lowered relatively the first preset speed and heightened relatively to the first preset temperature of the stream. Then they direct the tubing to the chamber of cleaning, where they realize cleaning of the tubing inner surface with the help of a high-pressurer air-gas stream for three minutes with introduction in it of grinding material in 30 seconds from the beginning of the cleaning. At that the temperature is lowered down to the temperature of the beginning of the process of swelling and decomposition of the asphaltenes, and the area of the tubing discharge holes at that is decreased by 20-25 % by entering along axes of each pipe of conical inserts with their apexes meeting the stream. Then they send the tubing to the bin of finish product and repeat the process of the cleaning with a newly prepared block of tubing, at which the process of heating is realized by a reverse air-gas stream purified from pollution in the cyclone type chamber of cleaning. The plant for a realization of the method contains a device for the heated gas generation, a chamber of the tubing cleaning and air ducts. At that the plant has: a chamber of pipes gathering in blocks with separate sections, in which the number of pipes should correspond to the number of the pipes to be cleaned in one shot; a chamber to filter polluted air-gas stream including a cyclone type device for cleaning of a gas stream containing an exhaust branch-pipe. In the upper part of cyclone there are filtrating and sound-absorbing elements and in the lower part of the cyclone there is a chamber of collection of products of cleaning. The device of generation of the heated gas is made in the form of heat-generator supplied with mixing chamber, in which there is an atomizer of the grinding material and the liquid, and on the end of which there is a nozzle-type slit tip divided into separate channels in compliance with the number of pipes to be cleaned; with the chamber of collection of the being cleared pipes. The chamber of cleaning of tubing is made in the form of sections linked to each other: a section of a preheating made in the form of the separate cavities with the slit type holes located over and below opposite to each separate pipe of the block of tubing, and a section of direct cleaning. Each of the section is fused by its counter butt correspondingly with the chamber of cleaning of a polluted air-gas stream and a nozzle slit type tip. At that the heat generator is linked with the mixing chamber. The chamber of cleaning of tubing and the chamber of filtration of the polluted air-gas stream are located in the linked to each other soundproof casings. At that inside the casing of the heat-generator there is a tank for liquid and a container for the grinding material, and the section of a preheating of the chamber of cleaning of tubing is fused to the chamber of cleaning of an air-gas stream of the filtration chamber by branch-pipes of inlet and an outlet of the air-gas stream of the cyclone type and the chamber of a gathering of a block of tubing, and the section of direct cleaning is fused by a branch-pipe with the cyclone type chamber of the air-gas stream cleaning and the chamber of gathering of cleaned tubing. The group of inventions ensures an increase of efficiency of cleaning of tubing and protection of ecological environment.

EFFECT: the group of inventions ensures an increase of efficiency of cleaning of tubing and protection of ecological environment.

2 cl, 2 dwg