RU2179626C1 - Gear to clean internal surfaces of pipes - Google Patents

Abstract

FIELD: gas and oil production. SUBSTANCE: proposed gear can be used to clean walls of wells and internal surfaces of pipes. Gear includes two identical devices as minimum positioned in tandem and interconnected with the help of adapter with central hole in which rods with set of scrapers are mounted in sequence for interaction. Cross-section area of scraper in front device is greater than same cross-section area of following device. Each device has hollow case with peripheral ducts. Rod with open longitudinal grooves is installed in case. Gear also carries elastic bar-shaped scrapers, pushers, shock-absorber and compensator of wear of scrapers. EFFECT: high-productivity cleaning of pipe with one passage of gear with implementation of requirements to cleaned surface. 2 dwg

Description

 The invention relates to the oil and gas industry and can be used to clean the walls of the well and the inner surface of the pipes.

 A device for cleaning the inner surface of pipes according to the patent of the Russian Federation RU 2131968, which includes a hollow body with peripheral channels mounted concentrically in the hollow body of the rod with the possibility of axial movement. In the peripheral channels of the hollow body and the channels of the rod elastic rod-shaped scrapers are placed. The device is equipped with pushers, a shock absorber installed in the hollow body, and a scraping wear compensator made with the possibility of interaction with the rod. The channels on the rod are made open, longitudinal, arranged in accordance with the peripheral channels of the hollow body and have bent sections of convergence with the latter. The elastic rod-shaped scrapers with the rear ends are rigidly connected to the rod and are installed in the section of the rod transition into the hollow body with a bend that repeats the bend of the convergence sections. Pushers are installed with the possibility of interaction with elastic rod-shaped scrapers and with a shock absorber. The working ends of the elastic rod-shaped scrapers at the outlet of the peripheral channels of the hollow body are arranged to each other and form a line corresponding to the cross-sectional shape of the peripheral channel of the hollow body. A threaded connector is provided in the latter at the convergence section of the stem channels and the hollow body, grooves are made on the front of the threaded connector to coincide with the peripheral channels of the hollow body, the threaded connector being provided with a spacer-centering sleeve fixed from rotation relative to the front of the threaded connector and forming the peripheral channel at the exit of the scrapers.

 The known device does not provide the required performance while ensuring the required quality of cleaning.

 The technical task is to increase productivity while ensuring the required quality of cleaning.

 The task is carried out due to the fact that the device consists of at least two tandem homogeneous devices that are interconnected by an adapter with a central hole, in which the rods with a set of scrapers are arranged in series and with the possibility of interaction, the cross-sectional area of the scraper in the front device being larger similar section in the subsequent device.

 In FIG. 1 shows a longitudinal section of the device along the line aa in figure 2; figure 2 is a remote section.

 The device consists of two homogeneous devices, one of which, rear, is shown in section, the second, front 1 - in general form.

 The front 1 and rear 2 parts of the hollow body are interconnected by means of a thread 3. Inside the hollow body, the stem 4 is axially displaceable. On the rod 4 there are open longitudinal channels 5 arranged around the circumference in accordance with the peripheral channels 6 in the front part 1 of the hollow body. The convergence sections of the open longitudinal channels 5 on the stem with peripheral channels 6 are made with a smooth bend in accordance with the profile of the front end 7 of the back part 2 of the hollow body.

 Elastic rod-shaped scrapers 8 are located in the open longitudinal channels 5 of the rod 4 and in the peripheral channels 6 of the hollow body, and at the convergence site of these channels, in accordance with the bend along the profile 7. The rear ends 9 of the scrapers 8 are rigidly connected to the rod 4, for example, mechanically by placing their L-shaped ends on the sides in the annular space 10. The rear end of the rod 4 is in contact with the actuator 11 of the wear compensation device for the scrapers 8, for example, in the form of a rod of a hydraulic or pneumatic cylinder (not specified), and the rear part 2 is hollow the housing is connected to the hollow drive shaft 12 with holes 13 for passing the flushing and cooling fluid coming from the annular space 14. Between the front 1 and the back 2 parts of the hollow body there is a spacer-centering sleeve 15, which serves as a centering element, holding a split threaded the end of the front part 1 of the hollow body, and as a spacer that defines the distance between the parts 1, 2 of the hollow body on the threaded connector 3. On the spacer-centering sleeve 15 there is a protrusion 16 located in the corresponding the corresponding groove of the front part 1 of the hollow body and serving to prevent their mutual rotation. In the contact zone 17 with the scrapers 8 at their exit from the peripheral channels 6, the sleeve 15 forms partially or completely channels (in this case, from the back side).

 Pushers 18 are located on the bending section of the scrapers from their front side with the possibility of interaction with the scrapers 8 under the action of the shock absorber 19, based on the adapter 20.

 The adapter 20 acts as a connecting intermediate element between the device described above and the front device 21.

 The rod 22 of the front device and the rod 4 of the last device with the corresponding sets of scrapers 23, 8 converge in the Central hole of the adapter 20, located one after another with the possibility of axial movement. The cross-sectional area of the scraper 23 in the set of the front device 21 is larger than the similar area of the subsequent device. This means that the front device has scrapers, for example, of a larger diameter (if we are talking about round scrapers) and it is obvious that the free flight of such a scraper is larger and this device is designed to clean the intact, solid, still resistant to destruction of the pipe surface 24. Front the device "loosens" the surface to be cleaned, prepares it for finer cleaning in the next step, that is, in this case by means of a subsequent device, in which the cross-sectional area of the scraper is smaller than the equivalent th section scraper previous device. This means that the set of scrapers of the previous device has smaller bumps available, which guarantees higher quality cleaning in one pass of the device as a whole.

 Thus, depending on the requirements for the quality of cleaning, on the properties of the surface being cleaned, the device may contain two or more tandem devices.

 The device operates as follows.

 Located on the roller tables (not indicated), the pipe to be cleaned 24 is fixed by a clamp (not shown) from rotation and axial movement. The device is inserted into the pipe to be cleaned 24, the drives for compensating for wear of the scrapers, the supply of flushing and cooling fluid, rotation 25 and the axial feed 26 of the device (not shown) are turned on in the sequence of their listing. Thus, the device enters the cleaning mode, in which the scrapers 8, 23 of both devices under the action of the actuator 11 in the axial direction 26 with the working ends are constantly pressed against the surface of the pipe 24 being cleaned, undergoing continuous wear over the entire cross section. As the scrapers 8, 23 wear out, the rods 4, 22 respectively continuously move along the axis relative to the hollow body with the front 1 and rear 2 parts under the action of the actuator 11 of the scraping wear compensation drive, pushing the latter through the peripheral channels 6. Each of the pushers 18 is independently friend, being under the influence of the reaction force from the side of the surface being cleaned, transmitted through the working ends of the scrapers 8, makes some reciprocating motion due to the shock absorber 19, as if copying the relay f cleaning surface, thereby achieving a smooth operation of the device with the performance requirements for the cleaned surface.

 During the cleaning process, the surface to be cleaned is washed through the passageways 27 with a washing-cooling liquid, which, together with the cleaning product, enters the sump (not specified).

 At the end of the cleaning process, before the device leaves the pipe being cleaned 24, the drive for compensating the wear of the scrapers is turned off to prevent their dissolution, and then the drives for flushing coolant, rotation and axial direct feed of the device are turned off. The device is removed from the pipe being cleaned in an accelerated mode, the cleaned pipe is released from the clamp (not specified) that holds it in the cleaning process, and is transferred to the next section of the production line (not specified) by roller tables.

 The device is in operation until the full use of the useful working length of the scrapers, after which the latter are replaced with new ones.

 The device provides high-performance pipe cleaning in one pass with the requirements for a cleaned surface.

Claims (1)

 A device for cleaning the inner surface of the pipes, comprising a hollow body with peripheral channels, mounted concentrically in the hollow body with the possibility of axial movement of the rod with open longitudinal channels located in accordance with the peripheral channels of the hollow body, made with a bend of the convergence section of the channels of the hollow body and rod, located in the channels of the latter, elastic rod-shaped scrapers with rear ends fastened to the rod, pushers, a shock absorber and interoperable action with the rod is a compensator for wear of the scrapers, while the pushers are installed on the channel convergence section on the front side of the scrapers with the possibility of interaction with the latter on the one hand and the shock absorber on the other, and the working ends of the scrapers at the exit from the peripheral channels of the hollow body are arranged to form a line corresponding to the shape of the peripheral channel in cross section, a threaded connector is provided on the convergence section of the rod channels and the hollow body, on the front of the threaded connector there is a the grooves coinciding with the peripheral channels of the hollow body, the threaded connector provided with a spacer-centering sleeve fixed from rotation relative to the front of the threaded connector and forming a peripheral channel at the exit of the scrapers, characterized in that it consists of at least two tandem-like homogeneous devices, interconnected by an adapter with a central hole in which the rods with a set of scrapers are arranged in series and with the possibility of interaction, and l the cross section of the scraper in the front device is larger than the same section in the subsequent device.

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