RU63851U1 - DEVICE FOR EXPANSION OF PIPES IN A WELL - Google Patents

Abstract

The proposal relates to the drilling and overhaul of wells and is intended for expansion (expansion) of pipes in the well.

A device for expanding pipes in a well, including a housing with a central channel, a sleeve and a nipple end for connecting to downhole equipment and recesses, in which rollers with a spherical surface are placed, mounted uniformly around the circumference and stepwise on the axes perpendicular to the axis of the body, and the diameters of the circles, described around the rollers in each stage, are reduced from top to bottom, while the recesses in the housing are made longitudinal, parallel to the axis of the housing and interacting with those located in tucked on top of each other by rollers made with a diameter increasing from bottom to top and rigidly connected to axes that are perpendicular to the axis of the housing from the outside and secured by a separator provided with holes for protruding rollers, the separator being made with the possibility of limited longitudinal movement relative to the housing, and the housing is connected to the rolling head with the possibility of rotational movement.

A device that expands a pipe simultaneously in two mutually perpendicular directions by means of rolling rollers allows pipes to be expanded in wells of small depth, while the axial load is small in comparison with the expansion of the pipes by the punch, since the force on rolling friction is less than on sliding friction. The service life of the expander increases, since wear during sliding friction is more intense than during rolling friction, while the quality of expansion of the pipes improves, because the rollers of the rolling head rotate, expand the expandable pipe, pressing it against the wall of the well, eliminating the errors of the shape of the longitudinal expansion. When working on wells with the proposed device, we obtain savings in material, energy and financial resources.

Description

The proposal relates to the drilling and overhaul of wells and is intended, in particular, for the expansion (expansion) of pipes when they are installed in the well.

A device is known for installing a profile overlap in a well (patent RU No. 2249090, C1 E21B 29/10, publ. Bull. No. 9 of 03/27/2005), containing serially connected lore nodes having bodies with a central passage channel and dies interacting by means of pushers with rods that are located in the central channel.

The disadvantage of this device is the inability to work in wells of small depth and the fragility of work due to loss of diameter due to sliding friction.

The closest in technical essence to the proposed one is a device for expanding casing pipes in a well (patent RU No. 2194841, C2 E21B 29/10, publ. Bull. No. 35 of 12/20/2002), containing a conical body with a central channel and recesses in the wall, arranged in steps along the length of the housing. In the recesses of the housing perpendicular to its geometric axis, rollers are installed with a convex surface uniformly around the circumference of the housing. In the spaces between the rollers, dies are installed that are detachably connected to the axes of the rollers and fixed from longitudinal movements. The rollers and dies in the steps are mounted so that the dies of the next step are located under the rollers of the previous one. The diameters of the circles described around the rollers and dies in each step decrease from a larger base to a smaller conical surface of the housing.

The disadvantage of this device is the inability to work on wells of small depth and a small durability due to loss of working size due to abrasion of the dies.

The technical task of the proposed utility model is to expand the use of the device in small wells, increase the durability, improve the quality of pipe expansion in the well, as well as save material, energy and financial costs when working in wells.

The stated technical problem is solved by a device for expanding casing pipes in a well, including a housing with a central channel, a coupling and nipple ends for connecting to downhole equipment and recesses, in which rollers with a spherical surface are placed, mounted uniformly around the circumference and stepwise on the axes perpendicular to the axis of the housing, and the diameters of the circles described around the rollers in each step are reduced from top to bottom.

The new fact is that the recesses on the casing are made longitudinal, parallel to the casing axis, interacting with rollers located in steps one above the other, made with a diameter increasing from bottom to top, and rigidly connected to axes that are perpendicular to the casing axis and are secured on the outside with a separator provided with holes for protruding rollers, and the separator is made with the possibility of limited longitudinal movement relative to the housing, and the housing is connected from above to the rolling head rotatably flax movement.

In Fig.1 shows a device during the expansion of the pipe with a longitudinal section, in Fig.2 a section along aa of Fig.1.

A device for expanding pipes in a well (FIG. 1) consists of a rolling head 1, a bearing 2 and a housing 3, which has connecting threads 4 for connecting to drilling equipment in the upper and lower parts. The housing 3 has a central passage channel 5, longitudinal grooves 6 (FIG. 2) parallel to the longitudinal axis of the housing 3 (FIG. 1), protrusions 7, 8 located in the lower and upper parts of the housing. Between the protrusions 7 and 8 is a separator 9. having holes 10 in which the rollers 11 are mounted.

The device operates as follows. A device for expanding pipes in a well is connected using a connecting thread 4 at the sleeve end of the milling head to a drill pipe string 12, on which it is lowered into the well to an expandable pipe 13, a separator 9 with rollers 11 is located

in the lower part of the housing 3, resting under its own weight in the protrusion 7 of the housing 3, while the lower step of the rollers 11 is located inside the expandable pipe 13. Rotating the drill pipe 12 together with the roll head 1 through the bearing 2 we create a load on the housing 3, we move it along axis of the well, while the rollers 11 are rolled along the longitudinal grooves 6 (figure 2) of the housing 3 (figure 1) and expandable pipe 13, expanding the walls of the pipe in steps. The walls of the pipe 13 expand until the separator 9, moved by the rollers 11, touches the protrusion 8 of the housing 3. Then, moving the housing 3 up, we translate the device into a position where the separator 9 with the rollers 11 will be in the lower part of the housing 3, then there is ready to repeat the distribution cycle. Repeating the movement of the housing 3 up and down within the distance between the protrusions 7, 8 of the housing 3, we gradually expand the pipe 13 to the required dimensions along the entire length. The final expansion of the pipe 13 is carried out by rotation with the simultaneous reciprocating movement of the rolling head 1 of any known construction, connected by a bearing 2 to the housing 3, which prevents its rotation.

The device, expanding the pipe by means of rolling rollers in two mutually perpendicular directions, allows the pipes to be expanded in wells of small depth, while the axial load is small compared to the expansion of the pipes by the punch, since the force on rolling friction is less than on sliding friction. The service life of the expander increases, since wear during sliding friction is more intense than during rolling friction, while the quality of expansion of the pipes improves, because rollers of the rolling head, spinning, rolling the expandable pipe, pressing it against the wall of the well, eliminating errors in the shape of the longitudinal expansion. When working on wells with the proposed device, we obtain savings in material, energy and financial resources.

Claims (1)

A device for expanding pipes in a well, including a body with a central channel, a sleeve and a nipple end for connecting to downhole equipment and recesses, in which rollers with a spherical surface are placed, mounted uniformly around the circumference and stepwise on the axes perpendicular to the axis of the body, the diameters of the circles described around the rollers, in each step they are reduced from top to bottom, characterized in that longitudinal recesses are made on the body, parallel to the axis of the body, interacting with rollers in steps above each other, made with a diameter increasing from bottom to top, and rigidly connected to axes that are fixed perpendicular to the housing axis from the outside with a separator provided with openings for protruding rollers, the separator being made with the possibility of limited longitudinal movement relative to the housing, and the housing is connected from above with a rolling head with the possibility of rotational movement.