DE1533593B1 - Suspension device, especially for underwater boreholes - Google Patents

Description

1 2

The invention relates to a hanging device, in particular a locking of the inner pipe string, with it especially for underwater boreholes, with one of these after sitting on the inner flange of the inner circumferential groove having outer pipe string outer pipe string can no longer be lifted as well as one having an outer recess. Raising is only possible by roughening the inside Pipe string, one between the two 5 ben a special additional tool Pipe strings located, biased to the outside - the upper end of the inner pipe string possible, th snap ring and a locking device assigned to it, whereby inclined surfaces abut the locking device. screwing tool and the pin of the

According to US Pat. No. 2,962,096, the latter can be pressed radially inward. There Already devices of the type mentioned are known, with io this hanging device thus a cross-sectional verdenen the snap ring by means of a reduction in an annulus of the outer pipe string requires to of the outer pipe string guided annular hydraulic piston intended for seating the inner pipe string Such a suspension piston is to be formed by an inner flange on the hydraulic system provided internal inclined surface inward device in cases where the in an outer groove of the inner pipe string an inner pipe string only in a relatively large one is pressable. A relaxation of the snap ring can be hung deep into the outer pipe sirang together with the separation of the two pipe strings from each other.

is by acting on the hydraulic piston in According to USA.-Patent 3,099,317 is also

causes the opposite direction, after which the explosive a hanging device, especially for lower ring by virtue of its bias from the outer groove ao water boreholes, known which an inner one of the inner pipe string pops out. The application circumferential groove-having outer pipe string as well a hydraulic piston to be acted upon on both sides a cage sleeve guided on the inner pipe string in addition to the required hydraulic lines, which with their cage bars in over the very complex and prone to failure. Evenly distributed, radially movable tapping

The purpose of the present invention is to engage the shaft and, depending on its axial position, to create a recess a significantly simplified upward or inward movement of the pins to cause and device that is less susceptible to failure is capable of not being hooked. An axial movement of the cage socket, earth-hydraulic actuated components. This is achieved after lowering the inner pipe string in that the outer tubing string is an additional one by shearing off a locking pin. These Internal groove that the snap ring is located on the device is not least located with regard to the emergency interior pipe string that the external evenness of the use of a cage socket is very good taking the inner pipe string vertically is complicated and not necessarily permissible, and therein a part of the locking device. The invention is illustrated below with reference to the direction of the drawing forming slide is movably guided and explained in more detail voltages. It shows that the slide has an outwardly biased, 35 Fig. 1 an embodiment of a erfindungsmit the additional inner groove to be brought into engagement - according to the hanging device in axial section in a has the projection. Position before reaching a desired lowering

With such a device depth according to the invention,

It is only necessary to cut the inner tube Fig. 2 a section from one in Fig. 1

string within the outer pipe string as far as 40 clear inner pipe string together with the associated abzüsenken, until the outwardly biased front components in an enlarged view jump of the slide with the additional inner groove the insertion into an outer pipe string, engaged. Then there is an increase F i g. 3 the in F i g. 2 illustrated excerpt

of the inner pipe string, an elevation of the inner pipe string becomes parallel in the viewing direction of the carriage together with the inner pipe string 45 to the plane of the paper of FIG. 2,

blocked, so that the slide relative to the Spreng- Fig. 4 the hanging device after reaching a

ring moved away and thus the snap ring unlocks the required lowering depth in a cutout will. After unlocking the snap ring, this representation is similar to FIG. 1,

the hanging device according to FIGS. 1 and 4 against the inner surface of the outer pipe string in FIG. 5

and when it is raised, it snaps into the open 5 ° position after reaching a first operating position, would take certain inner circumferentials of the snap ring. FIG. 6 shows the hanging device according to FIGS. 1, 4, 5

groove of the outer pipe string. after reaching a second operating position,

According to US Pat. No. 3,171,674, FIG. 7 is also the hanging device according to FIGS. 1, 4

a hanging device, especially for under 6 after reaching a third operating position, water boreholes, known, which have an inner 55 FIG. 8 the hanging device according to FIGS. 1, 4 Outer pipe string having circumferential groove and up to 7 after reaching a fourth and final an inner operating position having an outer recess.

Pipe string, one guided in the recess, The invention illustrated in the drawings

radially outwardly biased, for engagement in the proper hanging device comprises an outer inner one The circumferential groove of the outer pipe string bears a pipe string 10 with one for receiving one Correct pin and an inner flange on the outwardly biased snap ring 50 determined outer Pipe string comprises on which the inner th inner circumferential groove 12 and one below it-pipe string with an upper flange superimposed additional internal groove 14. can be arranged. The outwardly prestressed pin An inner pipe string 30 has a rectangular shape

has here with the hanging device, which by 65-shaped, vertically extending outer recess 64 the inner flange of the outer pipe string or the, which at its upper end by a the thereon resting flange of the inner pipe string recess cross-section fully filling in formed is to do nothing, but only serves welded stop 108 is complete. Of the

3 4

In the tensioned state, snap ring SO (see in particular FIG. 1, the pawl 98 is against the special FIGS. 1, 2) rests against the stop 108 and the inner surface of the outer pipe string 10 rests resiliently. tightly surrounds the inner pipe string 30 in the area The upper end of the pawl 98 is so geeiner outer circumferential groove 48. The circumferential groove 48 forms that when passing the inner circumferential above the fixed stop 108 a 5 catching groove 12 and the additional inner groove 14 no axial section 56, the outer diameter of which arrests the inner pipe string 30. In relation to the inner diameter of the outer one, it is sufficient to hang the inner pipe-pipe string 10 by at least double the radial string 30 in the outer pipe string 10, if the thickness of the snap ring is less than 5ß, one of the inner pipe string 30 is lowered until the section 56 adjoining section 56 conically outwardly io locking pawl 98 falls into the additional inner groove 14 , diverging inclined surface 58 and an axial section 54 adjoining it. 4 lowered even lower in order to ensure in each diameter, its difference compared to the inner case, that the pawl 98 with the diameter of the outer pipe string 10 is less subsequent lifting (as explained in detail, twice the radial thickness of the snap ring 50 15 is tert) with security in the additional interior. The groove 48 is indented at the top by a shoulder 60 with a groove 14.

closed. So if the inner tubing string 30 is in the outer one

In the basic position according to FIGS. 1, 2, the pipe string 10 has been lowered to such an extent that the snap ring 50 is held in the locking device by means of an associated locking device and the pawl 98 according to FIG. A 20 additional inner groove 14 is just able to collapse, an essential part of this locking device or the position according to FIG. 5 only reached, the device is a carriage 78, 96, which according to FIG. 3 after the inner pipe string 30 had previously been lowered two vertically and parallel to each other upwards Ends in the lower pawl 98 which extends from the dowel pins 78 and the ren ends of the dowel pins 78 and the bearing pin 96 holds the existing carriage in its position at such a distance that the outsides are locked.

the dowel pins 78, which in its lower part is now the inner pipe string 30 in the

Have a rectangular cross-section, raised further directly against the outer pipe string 10 , then the vertical lateral boundary surfaces 74 of the recess 30, the snap ring SO from the dowel pins 78 or recess 64 slide against each other. The upper end sections have their upper end sections 80 so far that these 80 of the dowel pins 78, which emerge from the recesses 82 in the stop 108. If this is the case, penetrating guide bores 112 are running, the snap ring 50 is released, which has a circular cross-section and now protrudes in two from the inner surface of the outer speaking vertical recesses 82 of the snap ring 35 pipe string 10. At the end of this relative limit 50, which has a cross section corresponding to the sections 80 of the tensioning movement between the snap ring 50 and the inner pin 78. ren pipe string 30 on the one hand and the one from the construction

On the bearing pin 96 is an existing means of elements 87, 96 slide on the other hand leaf spring 134 outwardly biased pawl strikes the outer surface of the pawl 98 pivotally supported against the 98, which in below even 40 return edge 107 to, when the carriage is the manner to be explained Approaches to engagement in the additional lower end of the recess 64. As a result, the lower inner groove 14 is determined. The recess takes place against a deflection of the pawl 98 against 64 has an inwardly opposite the outer circumference of the force of the spring 134 , so that the inner pipe string 30 is somewhat lowered, U-shaped, the pawl 98 from the additional inner groove-shaped edge 76, which one with a window 45 14 emerges again. When the inner 106 welded-on sheet metal plate 102 is raised further, flush with the pipe string 30, the slide is taken up together. The upper end of the pawl 98 protrudes in turn with the pawl 98 moved upwards, the basic position according to FIG. 1 or 2 by itself, it would suffice here, the inner

Window 106 to the outside and can only raise as far as the pipe string 30 passes by, as is the case in running the inner pipe string in the additional 50 FIG. 7 is illustrated. However, in order to be sure to collapse the inner groove 14 of the outer pipe string, that the snap ring 50 is in the inner circumference (FIG. 5). The lower limit of the window 106 groove 12 of the outer tubing 10 falls, the forms an inner tubing 30 running transversely to the recess 64 is raised to such an extent that the return edge 107 overlapping this, which against the snap ring 50 above the inner circumferential groove 12, the locking pawl is then to be brought to the facility when 55 is located. When the snap ring 50 runs past the slide comprising the components 78, 96 to the circumferential groove 12 , it snaps into place, but together with the pawl 98 to the lower end, the conical inclined surface 22 moves the recess 64 , as does this from the circumferential groove 12 of the snap ring 50 in the further the transition between F i g. 5 and 6 can be seen. As can be seen in particular from FIG. 5, the 60 is compressed so that a locking of the inner circumferential groove 12 of the outer pipe string 10 does not occur. If the snap ring 50 has limited its position by a conical inclined surface 22. according to FIG. 6 and becomes the inner pipe string

Before the inner pipe string 30 is then lowered into 30 again, the outer pipe string 10 is sure to protrude, the pawl 98 engages the snap ring 50 in the inner with its upper end through the window 106 over 65 circumferential groove 12, as shown in FIG i g. 7 is the largest outside diameter of the inner tube light.

strand 30 to the outside. After inserting the according to FIG. 7 is the snap ring 50 in the

inner pipe string 30 snapped into the outer pipe string circumferential groove 12 , but lies with it

its outer surface is not yet free of play against the inner surface of the circumferential groove 12. Is now starting from the position of FIG. 7 the inner Pipe string 30 is further lowered, so presses the inclined surface 58 of the outer circumferential groove 48 of the inner Pipe string 30 the snap ring radially outward against the inner surface of the inner circumferential groove of the outer pipe string 10, and this position of the snap ring 50 is fixed when the section of the outer circumferential groove 48 of the inner tubing string 30 against the inner surface of the snap ring applies. This latter position is shown in FIG. 8 illustrates. The inner tubing string 30 is now in FIG the outer pipe string 10 is securely attached.

Should it be necessary to later remove the inner pipe string from the outer pipe string 10, in this way an increase can easily take place, with the positions according to FIGS. 7 and 6 passing through will.

Claims (12)

Claims: 20 1. Hanging device, especially for underwater boreholes, with an inner circumferential groove having outer pipe string and an inner pipe string having an outer recess, one between the two Pipelines located, outwardly biased snap ring and one associated with this Locking device, characterized in that the outer pipe string (10) has an additional inner groove (14) that the snap ring (50) is on the inner pipe string (30) that the outer recess (64) of the inner pipe string (30) runs vertically and is a part of the locking device therein forming carriage (78, 96) is movably guided and that the carriage is an outwardly biased, with the additional Has inner groove (14) to be brought into engagement projection (130). 2. Device according to claim 1, characterized in that the additional inner groove (14) below the inner circumferential groove (12) and the carriage (78, 96) together with the outwardly biased one Projection (130) are arranged below the snap ring (50). 3. Device according to one of claims 1 to 2, characterized in that the slide (78, 96) comprises two vertically and parallel to each other upwardly extending dowel pins (78) and the snap ring (50) at its adjacent ends with two vertical indentations (82) of FIG is provided with a cross section corresponding to the dowel pins (78). 4. Device according to one of claims 1 to 3, characterized in that the recess (64) is closed at its upper end by a fixed stop (108) against which the snap ring (50) rests at least in the tensioned state. 5. Apparatus according to claim 4, characterized in that the stop (108) has the cross section the recess (64) and two of the dowel pins (78) of the slide (78, 96) has penetrated guide bores (12). 6. Device according to one of claims 1 to 5, characterized in that the after the externally prestressed projection (130) of the slide (78,96) is designed as a pawl (98), which can be pivoted about a bearing pin (96) running perpendicular to the dowel pins. 7. Apparatus according to claim 6, characterized in that the bearing pin (96) extends at both ends into the lower ends of the dowel pins (78) and the dowel pins (78) on their outer sides directly against vertical lateral ^ boundary surfaces (74) of the recess (64) % are sliding. 8. Device according to one of claims 3 to 7, characterized in that the dowel pins (78) have a rectangular cross-section at least in their lower area. 9. Device according to one of claims 6 to 8, characterized in that the recess (64) approximately at the level of the bearing pin (96) from a transverse return edge (107) is covered, which when the carriage (78, 96) moves to the lower end of the recess (64) is to be brought into contact against the pawl (98). 10. Device according to one of claims 1 to 9, characterized in that the inner Circumferential groove (12) is limited at the top by a conical inclined surface (22). 11. Device according to one of claims 1 to 10, characterized in that the snap ring is mounted (50) in an outer circumferential groove (48) of _Λ inner tubing string (30). ■ 12. The device according to claim 11, characterized in that the outer circumferential groove (48) of the inner pipe string (30) two axial sections (56, 64) with at least one height of the snap ring (50) has a corresponding height, of which the upper axial section (54) Has a larger outer diameter, and that both axial sections (54, 56) by a conical inclined surface (58) are connected to one another. 1 sheet of drawings