CN218376388U - Well repairing milling cone - Google Patents

Abstract

The utility model relates to an operation technical field in the pit, concretely relates to workover mills awl, mill the piece including milling the cone, suppressing switching part and activity, it is inside cavity and the closed tubular structure in bottom to mill the cone, the upper portion of milling the cone is provided with and scrapes the toper portion that mills the casing skin with connector and lower part that workover tubular column screw thread is connected, the first water hole of a plurality of circumference arrangements is seted up to the bottom of toper portion, the spacing groove of a plurality of circumference arrangements is seted up to the lower part of milling the cone, the activity mill the spacing activity of piece in spacing inslot and medial surface are provided with the inside protruding direction slope, suppress switching part including sitting and sealing ball seat and shutoff ball, sitting and sealing ball seat for cavity annular structure and spacing axial activity in mill the inside space of cone, the bottom of sitting and sealing ball seat with the contact of direction slope is connected, casing skin rebound when this device effectively overcomes ordinary milling and expands and mills the cover and blocks the passageway, convenient operation.

Description

Well repairing milling cone

Technical Field

The utility model relates to an borehole operation technical field, concretely relates to well workover mills awl.

Background

The milling cone is an important tool for repairing the well in the major repair construction, and is used for removing the blockage, opening a channel and expanding the diameter. The action principle is that the rigidity of external tooth milling shoes or hard alloy blocks or tungsten steel powder surfacing is utilized, under the rotation and the drilling pressure of a drill column, cutting chips, scraping chips and drilling and grinding are carried out, the deformation of the inner cavity of a sleeve, the sleeve skin, burrs, flash, scale, incrustation, cement are gradually scraped and milled and drilled and milled cleanly, the chips are flushed to the ground by applying a certain pump pressure and discharge capacity, so that the blockage is removed, a channel is opened, the effects of expanding the diameter and recovering the drift diameter size are achieved, but the existing well repairing milling cone has certain defects.

When the sharp drill bit is applied to channel drilling construction in a construction site, the sharp drill bit can drill a channel drilling tool and can smoothly pass through the channel under the condition that certain drilling pressure, rotating speed and well killing fluid circulation are applied, the sharp drill bit cannot pass through the channel when a milling cone with the same specification is used for expanding and milling a casing pipe at the same well section, the conditions of pump pressure rise, drill plate return force reduction and no footage occur, the milling cone is lifted out, the abrasion of the cone tip and the expansion of a water hole are found, the analysis reason is that the casing pipe skin rebounds to reduce the diameter of the casing pipe, the casing pipe skin props against the water hole part of the milling cone tip to form a fulcrum, the rotation of a symmetric axis is caused, and the purpose of sleeve repairing is not achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a well repair mills awl to the condition that the same standard mills awl under that prior art exists can not pass through and take place the pump pressure and rise, the drilling disc return force reduces, do not have the footage when expanding and mill same well section sleeve pipe to and play out and mill the awl and discover the defect that awl point wearing and tearing, water hole expand outward, provide a well repair mills awl.

The technical scheme of the utility model is that:

the utility model provides a workover mills awl, is including milling the cone, suppress and press switching part and activity and milling the piece, it is inside cavity and the closed tubular structure in bottom to mill the cone, the upper portion of milling the cone is provided with the connector of being connected with workover string screw thread and the lower part is provided with the conical tapered portion of scraping and milling the casing pipe skin, the first water hole of a plurality of circumference range is seted up to the bottom of conical portion, the spacing groove of a plurality of circumference range is seted up to the lower part of milling the cone, the spacing activity of activity mill the piece in spacing inslot and medial surface are provided with inside convex direction slope, suppress and press switching part including setting ball seat and shutoff ball, setting ball seat for hollow ring shape structure and spacing axial activity in mill the inside space of cone, the bottom of setting ball seat with the contact of direction slope is connected, works as when the shutoff ball is sat in on the setting ball seat, to when milling the inside pressurization of cone drive setting ball seat downstream and promotion the activity mills the piece and outwards removes.

Preferably, the middle part of the milling cone is provided with a plurality of pin shaft grooves which are circumferentially arranged, the pin shaft grooves are internally provided with springs and stop pins, the inner ends of the springs are fixedly connected with the inner walls of the pin shaft grooves, the outer sections of the springs are fixedly connected with the stop pins, the stop pins are in contact connection with the outer peripheral surface of the setting ball seat, and when the setting ball seat moves downwards, the springs drive the stop pins to move and are in clamping connection with the top surface of the setting ball seat.

Preferably, the bottom of the guide slope of the movable milling block is provided with a ball seat blocking platform protruding inwards, and when the setting ball seat moves downwards, the bottom of the setting ball seat is connected with the ball seat blocking platform in a clamping manner.

Preferably, the top of the movable milling block is provided with an upward convex limit stop, the top of the limit groove is provided with a downward convex milling block stop, the limit stop cooperates with the milling block stop in a clamping manner, and when the movable milling block moves to the outermost side, the movable milling block is connected with the milling cone in a clamping manner through the milling block stop.

Preferably, a plurality of second water holes are circumferentially arranged above the pin shaft groove, the setting ball seat blocks the second water holes, and when the setting ball seat moves downwards, the second water holes are communicated with the inner space of the milling cone.

Preferably, the surface of toper portion is provided with a plurality of irregularly arranged milling cone granule, the surface of activity milling block is provided with a plurality of milling block granule, milling block granule and milling cone granule are wear-resisting alloy steel material.

Compared with the prior art, the utility model, have following advantage:

the device effectively overcomes the defect that the casing leather rebounds to block the channel when the common milling cone expands, mills and repairs the sleeve, and avoids the phenomenon that the casing leather props against the water hole part at the tip of the milling cone to form a fulcrum, so that the symmetry axis rotates to cause reactive work. The improved pointed drill milling cone has compact structure and convenient operation.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a second state of the present invention;

in the figure: 1-milling a cone, 11-a connector, 12-a conical part, 13-milling cone particles, 14-a first water hole, 15-a second water hole, 16-a milling block stop block, 17-a limiting groove and 18-a pin shaft groove;

2-a pressure building switching part, 21-a setting ball seat, 22-a blocking ball, 23-a spring and 24-a stop pin;

3-movable milling block, 31-limit stop, 32-ball seat stop, 33-milling block particle and 34-guide slope.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings for the sake of simplicity.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Example one

Referring to fig. 1 and 2, compared with a traditional integrated milling cone, the well repairing milling cone is additionally provided with a movable milling block, when the milling cone idles, the milling block is pushed outwards, the radius of the milling cone can be increased, and the scraping and milling effect of the milling cone on a pipe wall is further increased, the concrete structure comprises a milling cone 1, a pressure-out switching part 2 and a movable milling block 3, the milling cone 1 is a hollow tubular structure with a closed lower end, the top of the milling cone 1 is provided with a connector 11 and is in threaded connection with an operating pipe column above the connector, the bottom of the milling cone 1 is a cone 12, and the bottom of the cone 12 is provided with a plurality of first water holes 14 which are circumferentially arranged.

The lower part of the milling cone body 1 is provided with a plurality of circumferentially arranged limiting grooves 17, each limiting groove 17 of the milling cone body 1 is internally and movably connected with a movable milling block 3 in a limiting mode, the inner side surface of each movable milling block is an inward protruding guide slope 34, the pressure-build-up switching part 2 comprises a setting ball seat 21 and a plugging ball 22, the setting ball seat 21 is of a hollow annular structure, the setting ball seat 21 is in limiting movement in the inner space of the milling cone body 1 and is in contact connection with the top of the inner side slope of the movable milling block 3, when the plugging ball 22 is placed into a workover string and sits on the setting ball seat 21, an operator pressurizes the inside of the workover string, the setting ball seat 21 moves downwards, and applies force to the movable milling block 3 through the slope of the movable milling block 3 to push the movable milling block 3 to move outwards, so as to increase the radius of the milling cone and increase the scraping and milling effect on the pipe wall.

The device effectively overcomes the defect that the casing leather rebounds to block the channel when the common milling cone expands, mills and repairs the sleeve, and avoids the phenomenon that the casing leather props against the water hole part at the tip of the milling cone to form a fulcrum, so that the rotation of a symmetry axis is caused, and reactive operation is caused. The improved pointed drill milling cone has compact structure and convenient operation.

Example two

Referring to fig. 1 and 2, the same as the first embodiment, except that a plurality of second water holes 15 are formed in the middle of the milling cone 1, a plurality of pin shaft grooves 18 are formed below the second water holes 15, a spring 23 and a stop pin 24 are arranged in the pin shaft groove 18 of the milling cone 1, the inner end of the spring 23 is fixedly connected with the pin shaft groove 18 of the milling cone 1, and the outer end of the spring is fixedly connected with the stop pin 24, when no pressurization is performed, the outer circumferential surface of the setting ball seat 21 blocks the second water holes 15 and supports the stop pin 24, the setting ball seat 21 descends after pressurization and removes the blocking of the second water holes 15, the stop pin 24 removes the limitation and limits the setting ball seat 21, the setting ball seat 21 is prevented from moving upwards, and after the blocking of the second water holes 15 is removed, a well washing liquid can be injected into the milling position, so as to cool the milling position, and prevent the milling cone 1 and the milling movable block 3 from being damaged and deformed due to high temperature generated by the milling.

EXAMPLE III

Referring to fig. 1 and 2, the same as the first embodiment, except that a milling block stopper 16 is arranged at the outer end of the top of a limiting groove 17 of the milling cone 1, a limiting stopper 31 is arranged at the inner end of the top of the movable milling block 3, and the movable milling block 3 is limited by the limiting stopper 31 and the milling block stopper 16, so that the movable milling block 3 is prevented from being pulled out due to excessive pushing-out, and accidents of fish falling in the well are avoided. The lower part of the guide slope 34 of the movable milling block 3 is also provided with an inwardly protruding ball seat stop 32, and the ball seat stop 32 is matched with the lower part of the setting ball seat 21 to prevent the setting ball seat 21 from moving downwards excessively.

A plurality of milling cone particles 13 which are irregularly arranged are arranged on the outer surface of the conical part 12, the milling cone particles 13 are in a convex tooth-shaped structure, and a plurality of milling block particles 33 are also arranged on the outer surface of the movable milling block 3.

The working principle is as follows:

1. the device is put into a deformed part of the sleeve and then starts to rotate, and the lower part of the milling cone 1 is provided with a plurality of milling cone particles 13 which are irregularly arranged, so that the scraping and milling operation can be effectively carried out on the pipe wall.

2. If the situation that the return force is reduced and no footage exists, the situation that the casing skin props against the milling cone body 1 may occur, at the moment, the plugging ball 22 is lowered into the pipe column, then the pump pressure is carried out in the pipe column, because the plugging ball 22 is located on the setting ball seat 21 to form a plugging structure, the pump pressure is carried out towards the interior of the pipe column to push the setting ball seat 21 downwards, the setting ball seat 21 further pushes the movable milling block 3 to move outwards through the guide slope 34 and is finally blocked by the milling block stopper 16, the downward movement of the setting ball seat 21 can release the limit of the stop pin 24 on the one hand, the stop pin 24 is released, the downward movement on the other hand and the contact and clamping with the ball seat stop 32 finally, and finally the upper part of the setting ball seat 21 and the released stop pin 24 are clamped at the moment.

The operating personnel rotates the milling cone 1 at the moment, the movable milling block 3 expands outwards, so that the scraping and milling radius is increased, and meanwhile, various scraping and milling particles are arranged, so that the sleeve deformation part can be scraped and milled more effectively.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a workover mills awl, mills the cone including milling the cone, suppressing and pressing switching part and activity and milling the piece, it is inside cavity and the closed tubular structure in bottom to mill the cone, the upper portion of milling the cone is provided with the connector and the lower part of being connected with workover tubular column screw thread and is provided with the conical portion that the tapered bushing skin of scraping was milled, the first water eyes of a plurality of circumference range are seted up to the bottom of conical portion, its characterized in that mills the spacing groove of a plurality of circumference ranges to the lower part of cone, the activity mill the piece spacing activity in spacing inslot and medial surface are provided with the direction slope of inside protrusion, suppress and press switching part including setting ball seat and shutoff ball, setting ball seat is cavity ring structure and spacing axial activity in the space inside the milling cone, setting ball seat the bottom with direction slope contact is connected, works as when the shutoff ball is located when setting up on the setting ball seat, it is right to drive during milling the internal pressurization of cone setting ball seat downstream and promote the activity mills the piece and outwards removes.

2. The well servicing milling cone of claim 1, wherein: the middle part of the milling cone is provided with a plurality of pin shaft grooves which are arranged circumferentially, a spring and a stop pin are arranged in each pin shaft groove, the inner end of the spring is fixedly connected with the inner wall of each pin shaft groove, the outer section of the spring is fixedly connected with the stop pin, the stop pin is in contact connection with the outer peripheral surface of the setting ball seat, and when the setting ball seat moves downwards, the spring drives the stop pin to move and is connected with the top surface of the setting ball seat in a clamping manner.

3. A well servicing milling cone according to claim 2, wherein: the bottom of the guide slope of the movable milling block is provided with a ball seat blocking platform protruding inwards, and when the setting ball seat moves downwards, the bottom of the setting ball seat is connected with the ball seat blocking platform in a clamping mode.

4. A well servicing milling cone according to claim 3, wherein: the top of the movable milling block is provided with an upward convex limit stop, the top of the limit groove is provided with a downward convex milling block stop, the limit stop is matched with the milling block stop in a clamping manner, and when the movable milling block moves to the outermost side, the movable milling block is connected with the milling cone in a clamping manner through the milling block stop.

5. A well-servicing milling cone according to claim 4, wherein: and a plurality of second water holes are circumferentially arranged above the pin shaft groove, the setting ball seat blocks the second water holes, and when the setting ball seat moves downwards, the second water holes are communicated with the inner space of the milling cone.

6. A well servicing milling cone according to claim 1, wherein: the surface of toper portion is provided with a plurality of irregularly arranged mills the awl granule, the surface that the activity was milled the piece is provided with a plurality of and mills a piece granule, mill a piece granule and mill the awl granule and be wear-resisting alloy steel material.

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