RU2144128C1 - Gear for expanding of pipes - Google Patents

Abstract

FIELD: drilling of holes; invention is designed for expanding of overlapping units made of profile pipes installed in hole. SUBSTANCE: proposed gear has body with central passage and recesses in outer surface where rollers are installed with the use of axles inclined with reference to axis of body. Recesses are so made in the form of longitudinal cylindrical grooves in body that larger part of side surface of rollers is enveloped by walls of grooves and axles of rollers are anchored fast and releasably in body with one ends and their other ends are provided with tail parts located in grooves. Surfaces of tail parts protruding from grooves form together with surface of nipple end of body untouched by grooves common conical surface that has nipple thread. It is advantageous to screw fixing rod in the form of bushing on to thread in recesses. EFFECT: increased operational reliability of gear. 3 cl, 3 dwg

Description

 The invention relates to drilling and overhaul of wells and is intended, in particular, for flaring devices from shaped pipes when installed in wells.

 A device for expanding pipes in wells, including a housing with a Central channel and thread for connecting with downhole equipment. In this case, the casing consists of interconnected cylindrical and conical parts, the last of which is made of cylindrical grooves with rollers placed in them obliquely relative to the axis of the casing [1].

 This device is not efficient enough due to the rapid wear of the surfaces of the rollers and grooves in which they are placed, due to their mutual abrasion during operation of the device.

 In addition, the grooves on the side of the connection between the conical part of the body and the cylindrical one form in it a section that is dangerous from the point of view of its strength, which takes up the greatest torque, which excludes the application of the device operating modes with increased loads necessary when expanding thick-walled profile pipes.

 Closest to the invention in technical essence is a device for expanding pipes in wells (calibrator), comprising a housing with a central channel, a sleeve and nipple ends with threads for connection with downhole equipment and having a conical part with recesses in which rollers are mounted on inclined in relation to the axis of the housing axes with a gap between their surface and the walls of the recesses [2].

 The main disadvantage of this device is also the low strength of its housing due to the weakening of the cross section of its conical part with recesses under the rollers, made in the radial direction from the periphery to the center of the housing, with a radius far exceeding the radius of the rollers.

 In addition, in the event of a breakdown of the axis of any of the rollers, an emergency situation arises associated with jamming of the device in the well due to the loss of the axis and the roller from the housing.

 Another disadvantage of the known device is that in case of wear of the rollers they cannot be replaced with new ones, since their axes are fixed in one piece in the housing.

 These disadvantages do not allow the use of the known device for expanding thick-walled profile pipes in wells, in which it is necessary to use large axial loads and torque.

 The purpose of the invention is to increase the reliability of the device by increasing the strength of its housing, preventing the loss of working elements from the housing in case of breakage and providing the possibility of replacement after wear.

 This is achieved by the fact that in the described device for expanding pipes containing a housing with a central channel, sleeve and nipple ends with threads for connection with downhole equipment and recesses in the wall, in which rollers are placed, mounted on axes inclined with respect to the axis of the housing with gaps between their lateral surface and the walls of the recesses, according to the invention, the recesses for placing the rollers are made in the form of longitudinal cylindrical drills (grooves) in the wall of the housing so that most of the side the surface of the rollers is covered by the walls of these drills (grooves), and the axes of the rollers are detachably fixed with their ends in the housing, and their other ends are equipped with shanks located in the cylindrical drillings (grooves) and forming a common conical surface with the surface of the nipple end of the housing not affected by them, on which is made nipple thread.

These differences can improve the reliability of the device without changing its minimum outer diameter for a given size due to:
- increasing the wall thickness of the body in the most dangerous section of it, thereby increasing the strength of the body;
- prevention of loss of axles and rollers from the recesses of the housing in case of failure, thereby eliminating accidents associated with this;
- providing the ability to replace rollers and axles in case of wear or breakage.

 Another difference of the described device is that the shanks are rigidly connected to the axes of the rollers.

 This allows you to further strengthen the device’s casing by increasing the thickness of its walls in dangerous sections by the sum of the cross-sectional areas with shanks, because with this design of the device, they work with the body as a whole.

 It is also advisable that the device was equipped with a clamp of the shaft shafts in the drills (grooves), made, for example, in the form of a sleeve screwed onto the nipple end of the body and adapted for connection with downhole equipment.

 This increases the rigidity of the connection of the shanks with the housing of the device.

 In FIG. 1 shows a device installed with a profile flare pipe; in FIG. 2 is a section AA in FIG. 1 device outside the well; in FIG. 3 and 4 are a section BB-B and BB (respectively) in FIG. 1, which shows the position of the profile pipe in the casing before and after flaring.

 A device for expanding pipes (Fig. 1) contains a housing 1 with a central channel 2, sleeve 3 and nipple 4 ends with threads 5 and 6, respectively, for connecting with downhole equipment, between the sleeve 3 and nipple 4 ends there is a section with a conical surface 7, in the wall of which, as well as in the nipple end 4 of the housing 1, has recesses 8 in the form of cylindrical longitudinal drilling (grooves) (Fig. 1, 2), made from the top of the cone forming a conical surface 7, with the exit of part of their surface outside the wall Pusa. In these drills (grooves), shanks 10 and axles 11 are mounted rigidly interconnected with tapered rollers 12 mounted on them with gaps 13 between their lateral surface and the walls of the recesses 8. The other ends of the axles 11 are rigidly and detachably fixed in the housing 1 with the supporting sleeves 14 and the pins 15, and the nipple thread 6 is made on the surface formed by the surface of the nipple end 4 of the housing 1 and the outer surface of the shanks 10, which is not affected by the drilling (grooves) 9, which extends beyond the limits of the drilling (grooves) 9.

 To ensure greater rigidity of the connections of the shanks 10 with the housing 1, the device is equipped with a shank lock 10 in the holes (grooves) 9, made in the form of a sleeve 16 screwed onto the nipple end 4 of the body and having another thread 17 for connecting the device to the downhole equipment located below it ( not shown).

 The operation of the device is illustrated by the example of flaring profile pipes when they isolate the zone of leakage of the casing string 18 (Fig. 1, 3, 4) of the well.

 Profile pipes 19 are lowered inside the casing 18, into the insulation interval and expanded until their walls are pressed against the wall of the casing 18 (Figs. 1, 2, 3) by creating internal hydraulic pressure. Then, using thread 5 of the sleeve end 3 of the housing 1, the device is connected to a drill pipe string (not shown) and lowered into the well. When the device reaches the upper end of the profile pipes 19, the pipe string begins to rotate while simultaneously creating an axial load and flushing the pipe cavity and the device through the central channel 2 of the housing 1 by pumping 1 fluid. As a result, pressure-less sections 20 (FIG. 3) of the profile pipes 19 are straightened until the entire outer surface of the profile pipes 19 is tightly pressed against the inner surface of the casing 18 (FIG. 4).

 At the end of the flaring, the drill pipe string with the device is lifted from the well.

 The described improvements of the device allow, using the advantages of roller flaring machines compared to roller cones, to use it for expanding thick-walled profile pipes, where it is necessary to withstand heavy loads.

Sources of information
1. USSR author's certificate N 371340, E 21 B 29/00, 1973.

 2. Johannesyan K.V. Driller's satellite. (Directory). - M .: Nedra, 1986, p. 85, fig. 4.19.

Claims (3)

 1. A device for expanding pipes, comprising a housing with a central channel, a sleeve and nipple ends with threads for connecting to downhole equipment and recesses in the wall, in which the rollers are mounted, mounted on axes inclined with respect to the axis of the housing with a gap between their lateral surface and the walls of the recesses, characterized in that the recesses for placing the rollers are made in the form of longitudinal cylindrical drills or grooves in the wall of the housing so that most of the side surface of the rollers is covered by a wall of these drills or grooves, and the axes of the rollers with their ends are detachably fixed in the housing, and their other ends are equipped with shanks located in cylindrical drillings or grooves and forming, with the surface of the nipple end of the housing not affected by them, a common conical surface on which the nipple thread is made.  2. The device according to claim 1, characterized in that the shanks are rigidly connected to the axes of the rollers.  3. The device according to claim 1 or 2, characterized in that it is provided with an axle shank retainer in the drills or grooves, made in the form of a sleeve screwed onto the nipple end of the body and adapted for connection with downhole equipment.

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