Wells – Brushing – scraping – cutting or punching-type cleaners
Patent
1992-11-13
1994-12-13
Melius, Terry Lee
Wells
Brushing, scraping, cutting or punching-type cleaners
166173, E21B 3702
Patent
active
053721918
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The claimed invention relates to devices of the type used for petroleum production, more specifically, those for removing paraffin and other deposits from the internal surface of pipes in oil wells.
DESCRIPTION OF THE PRIOR ART
The operation of oil wells is complicated by the intensive deposits of paraffin and other solid deposits on the inner walls of the pipes of an uptake column, which considerably encumbers and more often than not totally precludes the passage of oil therealong.
For purposes of cleaning the interior space of pipes use is made of various constructions of devices.
Known in the art is a device for removing paraffin from the interior spaces of oil collecting pipe lines with an air-tight gas/oil collecting system, which comprises upper and lower cleaning heads installed on the body portion, cutting members--knives provided on the external lateral surface of the cleaning heads, and an attachment to a tractive member that is situated in the upper part of the body (SU, A, 153890). The provision in the prior art device of a valve unit whose shut-off member is coupled with the tractive member, and a seal mounted on the body portion, complicate the prior art device and aggravate the reliability of its operation. The device can hang up at the sections of a non-uniform intensity of paraffin deposits and be jammed in the deformed sections of piping. The device is not intended for the removal of solid deposits.
Also known is a device of the type for removing paraffin from the internal surface of pipes, comprising a body portion in the form of a shaft, upper and lower cleaning heads carried by the shaft for rotation in opposite sides with respect to each other in a stream of fluid, cutting elements provided on oppositely directed spiral paths over the external surface of said cleaning heads, a main stabilizer disposed on the shaft between the upper and lower cleaning heads, and an attachment to a tractive member (SU, A, 1594265).
The prior art device is deficient in that the force of a stream of fluid is insufficient for overcoming the resistance created by cutting elements (pins) which are in cooperation with the pipe walls, whereby the cleaning heads are not rotated, a factor that lowers the efficiency and quality of the cleaning of the internal surface of pipes.
SUMMARY OF THE INVENTION
It is the principal object of the present invention to provide a device of the type used for cleaning the interior spaces of pipes from paraffin and other deposits in such a way as to improve the efficiency and quality of cleaning steps under low temperatures and in the presence of a gas-oil ratio by selecting the most favourable structural dimensions of device elements with the simultaneous simplification of the construction.
Said task is to be solved with a device for removing paraffin and other deposits from the interior space of pipes. A body portion is constructed as a shaft, and upper and lower cleaning heads are disposed on the shaft for rotation to opposite sides relative to each other in a stream of fluid. Cutting elements are provided on oppositely directed spiral paths on the external surface of said cleaning heads. A main stabilizer is carried by the shaft between the upper and lower cleaning heads. An attachment to a tractive member is equipped with a lock pin securely fastened in the lower part of the shaft. An auxiliary guide stabilizer fixed in the upper part of the shaft. The unit of attachment to the tractive member is positioned in the upper part of the auxiliary guide stabilizer. The cutting elements are shaped like knives with an involute profile. The upper and lower cleaning heads are supported on the shaft in bearings to form a section, and, along with this, in the upper portion of the upper cleaning head and in the lower portion of the lower cleaning head, the knives with the involute profile have cutting collars and the height of each cleaning head is derived from the relation: H=D/2 tg.alpha., wherein H is the height of the cleaning head; and D is the diameter
REFERENCES:
patent: 2220237 (1940-11-01), Hall
patent: 3044552 (1962-07-01), Claiborne
patent: 3251306 (1966-05-01), Plunk
patent: 3507328 (1970-04-01), Henderson
patent: 3537519 (1970-11-01), Long
patent: 4007784 (1977-02-01), Watson et al.
patent: 4572291 (1986-02-01), Robinson
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