RU2253000C2 - Device for catching drilling and casing pipes in rotor of drilling plant - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: device has pipe catcher with inserts and wedges mounted in their slanting grooves, interacting with drive via sub-rotor ring with grooves, supports with holders and guiding boards connected to the latter by fingers, and positioned in through aperture of rotor table. Outer surfaces of guiding boards are made circular and mounted with possible interaction with walls of through aperture of table of rotor. Second portion of guiding boards is made with T-shaped head, connecting fingers of which for connection to holders are provided with spring-loaded holders. Distance between adjacent guiding boards below T-shaped heads is greater than width of wedges, lower portion of guiding boards is made with shelves on inside surfaces, and walls of grooves in sub-rotor ring - with responding recesses.

EFFECT: higher reliability, higher personnel safety, higher serviceability, increased load capacity.

4 cl, 14 dwg

Description

The present invention relates to the field of deep drilling, and in particular to devices designed to capture drill and casing pipes in the rotor of a drilling rig.

A device for gripping pipes in the rotor of a drilling rig is known, comprising a housing with an internal conical surface, a sleeve and inserts with wedges installed in its cavity, made with supporting and guide surfaces and connected to the wedges by means of pendant holders and guide rails with a rotor ring (1) .

The main disadvantage of this device is the placement of guide rails inside the housing and, as a result of this, limiting the range of sizes of the captured pipes.

A device for gripping pipes in a rotor is also known, including a housing, liners with an internal conical support, cutting grooves for guide strips and wedges with dies installed in the supporting grooves made both in the liners and in the housing (2).

The main disadvantage of this device is the limited range of gripping pipes, low reliability due to the possibility of jamming of wedges and insufficient load capacity.

The closest to the proposed technical essence and the achieved result is a device for gripping drill and casing pipes in the rotor of the drilling rig, including pipe grab with liners and wedges installed in their inclined flat grooves, interacting with the drive through the rotor ring with grooves, hangers with holders and connected with them the fingers of the guide strips placed in the through hole of the rotor table (3).

The disadvantages of the prototype include the low carrying capacity and reliability in operation due to the use of guide rails of rectangular cross section, the limited size of the gripping pipes due to the insignificant distance between the guide rails and the likelihood of emergency situations due to unreliable connection of the guide rails to the holders and the possibility of wedges coming out out of engagement with the housing.

In connection with the stated technical object of the invention is the elimination of these drawbacks and the creation of a device for capturing drill and casing pipes in the rotor of a drilling rig, which provides an extension of the sizes of the gripped pipes, an increase in load capacity while maintaining its dimensions, as well as reliability, safety and ease of operation.

The problem is solved in that in the device for gripping drill and casing pipes in the rotor of the drilling rig, including pipe grab with liners and wedges installed in their inclined grooves, interacting with the drive by means of the rotor ring with grooves, hangers with holders and guide rails connected to them by fingers placed in the through hole of the rotor table, according to the invention, the outer surfaces of the guide rails are made round and installed with the possibility of interaction with the walls the rotary table hole, and the upper part of the guide rails is made with a T-shaped head, the connecting fingers of which with the holders are equipped with spring clips, while the distance between adjacent guide strips below the T-shaped heads is greater than the width of the wedges, the lower part of the guide strips is made with protrusions on lateral surfaces, and the groove walls in the rotor ring with reciprocal grooves.

The solution of the problem also contributes to the fact that:

- in the extreme upper position of the wedges, their upper ends are located below the supporting ends of the T-shaped heads of the guide bars;

- the holder is connected to the suspension by means of a finger located in a plane intersecting the heads of adjacent guide bars;

- spring clips are made in the form of two strikers with conical tips with a spring placed between them, and connecting fingers with conical holes to accommodate the strikers and with a closed longitudinal groove for the travel limiter of the connecting fingers in the form of a threaded screw.

The invention is illustrated by the drawing, in which figure 1 depicts a General view of the device, the left part is for working with drill pipes, the right part is for working with casing pipes; figure 2 is the same for working with heavy drill pipes and casing of medium diameter; figure 3 - the same, on the left - with raised wedges, on the right - with raised guide dies; figure 4 - section I-I in figure 1; figure 5 - section II-II in figure 1; 6 is a section III-III in figure 2; Fig.7 is a section IV-IV in Fig.3; Fig.8 is a section V-V in Fig.3; Fig.9 is a section VI-VI in Fig.3; figure 10 is a section VII-VII in figure 3; 11 is a section VIII-VIII in figure 10; Fig - section IX-IX in Fig.10; Fig.13 is a section XX in Fig.3 and Fig.14 is a section XI-XI in Fig.11.

A device for gripping drill and casing pipes in the rotor of a drilling rig includes a pipe grab which, when working with drill, weighted and casing pipes of medium diameter, comprises a housing 1 (see Figs. 1 and 2), liners 2, and die or non-plate wedges, respectively, 3 and 4, and when working with large-diameter casing pipes, inserts 5 with wedges 3 or 4. The outer surface of the pipe gripper congruent to the inner surface of the hole 6 of the table of the rotor 7 has a stepped shape with a faceted upper part 8. In the through hole 6 of the table wedges 7, respectively, are placed 3 and 4, which by means of suspensions 9 with holders 10 and guide rails 11 with rotor ring 12 interact with the drive 13. The guide rails 11 are made with a round outer surface 14 and are installed with the possibility of interaction with the walls of the holes 6 of the table the rotor 7. In this case, the side faces 15 of the guide strips 11 interact with the side walls 16 of the grooves 17 in the housing 1 or with the side faces 18 of the inserts 5, and the inner walls 19 of the guide strips 11 with the bottom of the grooves 17 or with a peripheral face 20 centralizers 21 mounted between the inserts 5 in the lower part thereof. The upper part of the guide strips 11 is made with a T-shaped head 22 with grooves 23 for the holder 10 and perpendicular to them channels 24 under the fingers 25 with spring clips of their position. The fingers 25 are made with a longitudinally closed groove 26 with side walls 27 for a limiter of axial movement of the fingers 25 in the form of a threaded screw 28 and conical holes 29 on the side surface, which fixes the position of both fingers 25 in the head 22 of the guide bars 11. The spring clips used for this purpose include two conical striker 30 included in the counter holes 29 on the fingers 25, and a spring 31 placed between them. In order to reduce the bending forces acting on the system, the guide bars 11 - holders 10, flat awn passing through the connecting shaft 32 with holders 10 pendants 9 intersects the T-shaped head 22 of adjacent guide plates 11 (Figure 10). Moreover, in the extreme upper position of the wedges, their upper ends 33 are located below the supporting ends 34 of the working heads 22 of the guide strips 11 by an amount of -e (Fig. 3), which ensures unhindered installation of wedges 5 for large diameter casing pipes. For the same purpose, the distance b between adjacent guide strips 11 below the T-shaped heads 22 should be greater than the width c and d wedges 5 (Fig.5, 6). The lower part of the guide strips 11 is placed in the grooves 35 made in the protrusions 36 of the rotor ring 12, the lower part of the guide strips 11 is made with protrusions 37 on the side surfaces, and the walls 38 of the grooves 35 in the rotor ring 12 are with reciprocal grooves 39, in which fastened by means of rods 40. In this case, the guide strips 11 can be equipped with safety inserts 41 made of intrinsically safe material, located under the lower end 42 of the pipe gripper and fixed to the strips 11 by means of a type connection "dovetail". To save expensive intrinsically safe material, inserts 41 are made integral and its lower part 43 is made of another material.

A device for capturing drill and casing works as follows. During tripping with drill pipes, the raising and lowering of the wedges 3 is carried out through the suspensions 9, the holders 10, the guide rails 11, the rotor ring 12 and the drive 13. The holders 10 are mounted in the guide rails 11 by a spring clip with the fingers 25 lowered. When lifting the wedges 3 and 4 safety inserts 41 are supported in the lower end of the pipe catch 42, excluding the wedges 3 and 4 coming out of engagement with the liners 2 and 5. When raising and lowering the wedges 3 freely pass between the guide plates 11 under their T-shaped heads 22. Before wedges 3 fingers 25 rise and are fixed by a spring clamp.

When tripping with weighted drill pipes and casing of medium diameter, the raising and lowering of the wedges 4 in the liners 2 and the housing 1 is carried out as well as with drill pipes.

When lowering the casing pipes of large diameter, instead of the housing 1, liners 5 are installed, the outer surface of which is made congruent to the bore hole 6 of the rotor table 7. The process of hoisting operations is similar to the above.

The use of the proposed device when carrying out tripping operations with all types of drill and casing strings, due to the placement of the suspension axles 9 in the holders 10 in planes passing through adjacent T-shaped heads 22 of the guide bars 11, eliminates the occurrence of significant distortions of the holders 10 in the grooves of the guide bars 11, leading to different heights of the installation of the wedges 3 and 4. In addition, the proposed device provides a mechanized capture by the wedges of all the main pipe sizes with an increase in lifting capacity of the apparatus to the rotor carrying capacity, improved reliability, durability of the device and safety device with reduced weight while maintaining its dimensions.

Sources of information

1. RF patent 2110663, cl. E 21 B 19/10/1995

2. USSR Authenticity Certificate No. 768931, cl. E 21 B 19/10, 1980

3. RF patent 2142551, cl. E 21 B 19/10, 1997

Claims (4)

1. A device for gripping drill and casing pipes in the rotor of a drilling rig, including pipe gripping with liners and wedges installed in their inclined grooves, interacting with the drive by means of a rotor ring with grooves, hangers with holders and guide bars connected to them by fingers placed in the through hole rotor table, characterized in that the outer surfaces of the guide strips are made round in shape and are installed with the possibility of interaction with the walls of the through hole of the rotor table, with The upper part of the guide strips is made with a T-shaped head, the connecting fingers of which with the holders are equipped with spring clips, while the distance between adjacent guide strips below the T-shaped heads is greater than the width of the wedges, the lower part of the guide strips is made with protrusions on the side surfaces, and the walls grooves in the rotor ring - with reciprocal grooves. 2. The device according to claim 1, characterized in that in the extreme upper position of the wedges, their upper ends are located below the supporting ends of the T-shaped heads of the guide bars. 3. The device according to claim 1, characterized in that the holder is connected to the suspension by means of a finger located in a plane intersecting the heads of adjacent guide rails. 4. The device according to claim 1, characterized in that the spring clips are made in the form of two strikers with conical tips with a spring located between them, and the connecting fingers with conical holes to accommodate the strikers and with a closed longitudinal groove under the travel limiter of the connecting fingers in the form threaded screw.

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