CN86105695A

CN86105695A - the drill collar cutter

Info

Publication number: CN86105695A
Application number: CN198686105695A
Authority: CN
Inventors: 詹姆斯·奈杰尔·斯梅塔姆; 拉扎里斯·拉扎尔
Original assignee: C-E Verco Uk Ltd (gb) Devanha House Riverside Drive Aberdeen Ab1 2sl Scotl
Current assignee: C-E Verco Uk Ltd (gb) Devanha House Riverside Drive Aberdeen Ab1 2sl Scotl
Priority date: 1985-07-25
Filing date: 1986-07-23
Publication date: 1987-01-21
Also published as: DK315686D0; EP0210758A2; NO862981L; DK315686A; GB8615905D0; EP0210758A3; NO862981D0; GB2178091B; GB8518808D0; GB2178091A

Abstract

The device 1 of cutting pit shaft drill collar has a housing 2 of depositing explosive, is placed on the contiguous place of drill collar of pit shaft, have device 3 the various different-diameters place of apparatus 1 in pit shaft 4 calmly in.Mineshaft diameter changes shown in X among the figure and Y.

Description

The drill collar cutter

The present invention is relevant with the drill collar cutter.

The drilling well of the sub-sea drilled wells of fossil fuel etc. such as back production oil and/or natural gas, waiting until after exploitation just needs sealing when not having economic worth.Often need in this case the drill collar of oil well is cut off, not making has the residual thing that exceeds sea bed under water on the seabed.Yet the rugosity of this drill collar can reach 9.5 inches (about 24 centimeters).Cut off this structure and be everlasting and carry out under the mal-condition, serious problems may occur, in the vicissitudinous pit shaft of internal diameter,, do not belonged to least major issue cutter accurate location on request.The sectility device is generally a blasting charge.

Therefore one of purpose of the present invention is to seek to eliminate these shortcomings.

According to the present invention proposes a kind of pit shaft drill collar cutter, wherein there is housing, a housing of putting explosive to be used for being inserted near the drill collar of a cylindrical pit shaft, there is device to be connected with an end of pit shaft, it is basic fixed in pit shaft to be used for housing.

Use and to utilize funicular system location in the well when of the present invention.

Centering device can comprise the elastic device that can radially bend, to adapt to the variation of mineshaft diameter.

Two elastic devices can be arranged, and first is at an end of housing, and second in the axial opposite end of housing, thus two elastic devices apparatus axially on spacing is arranged.

All elastic device can have spaced arcuate tab spring arrangement, is placed on the elongated elements.

First elastic device can have two pairs of arcuate tab devices, two pairs of relative both sides radially that are in long elements, and the opposite end of spring assembly is separately fixed on the ring of long elements, and a ring is fixing, and another slides on long elements.

Slip ring can have a helical spring around long elements between other two retainer rings, be between one of this other ring and the slip ring, a helical spring is arranged around long elements again, is between another ring and slip of other ring.

The arcuate tab spring arrangement can be fixed on the corresponding ring with pivot.

The arcuate tab spring arrangement can be fixed with the spring band device around retainer ring.

Second elastic device has two pairs of arcuate tab spring arrangements, these two pairs of sheet spring arrangements are in long elements relative both sides radially, the opposite end of spring assembly, fix on the ring of long elements corresponding, a ring is fixing, another slides on long elements, has device to regulate the initial position of slip ring on the long elements, stretches degree with the maximum side of setting up arcuate tab.

Adjusting device can have a ring that locking device is arranged, and ring can be locked on the position of wanting of what is the need in office along the length of long elements.

The end of semielliptic spring device can be fixed by the way and the retainer ring that curl.

Long elements can have a core bar, above the electric contact of installing apparatus.

Core bar can have a steel body, and the insulation of a microscler copper bar and steel body is wherein arranged.

The copper bar can be concentric with the steel body.

A plug device can be arranged, the corresponding long elements of housing and first and second centering device is connected part, each plug device can have the cylindrical part of two different-diameters, forms the centering device and the housing of plug jack joint.

Apparatus can have crossover device, and apparatus is connected with the cable suspension.

Crossover device can be installed on the end away from housing of core bar.

A microscler elongate member can be arranged in the centre of housing and core bar, put an initiator in the elongate member.

Plug device can be connected with housing, and first centering device can have one or several plug holees, when the blasting charge detonates, and compression wave in the dissipation pit shaft and/or water.

Hereinafter as an example, with reference to accompanying drawing, drill collar is cut off apparatus be described herein.

Fig. 1 is the diagrammatic elevational view of an embodiment of drill collar cutter of the present invention;

Fig. 2 is the enlarged side view of this apparatus first centering device;

Fig. 3 is apparatus first plug among Fig. 1, promptly plays the local longitudinal profile larger scale map of plug;

Fig. 4 is the local enlarged side view of vertically analysing and observe for apparatus housing among Fig. 1 has, the equal installation in position of upper and lower plug;

Fig. 5 is apparatus second plug shown in Figure 4, that is goes up the lateral view that local longitudinal profile is arranged of plug;

Fig. 6 is shown in Figure 1, but the core bar of the apparatus that ratio is amplified, and illustrates the lateral view of its local longitudinal profile;

Fig. 7 is shown in Figure 1, but the leap body of the apparatus that ratio is amplified, and illustrates the lateral view of its local longitudinal profile,

Fig. 8 is shown in Figure 1, but the lateral view of second centering device of the apparatus that ratio is amplified;

Fig. 9 is that apparatus shown in Figure 1 is used, than the local longitudinal profile lateral view of copestone spare (keystone) of Fig. 1 magnification ratio;

Figure 10 is a kind of local longitudinal profile lateral view that changes form of apparatus of the present invention.

Referring to accompanying drawing, the drill collar of pit shaft shown in it cutter 1 includes an explosive and deposits shell 2, is placed in the pit shaft and the drill collar adjacent, has device 3 that apparatus 1 is passed through various different-diameters in pit shaft 4, in deciding in pit shaft.Vary in diameter in the pit shaft, at the X of Fig. 1, the expression of Y place.

In illustrated embodiment, two elastic devices have been installed in being, by shell 2 at interval, first or down during elastic device 5(running), by first on tubular shell 2 one ends or following (running) plug 6, be connected with shell 2, second or on elastic device 7, by second or go up plug 8, be connected with the opposite end (or running upper end) of shell 2.Second elastic device 7 is installed on the core bar 9, and an instrument 10 of crossing over body or apparatus 1 is installed on the core bar.

Therefore, apparatus 1 makes progress from the lower end of (during running), and first elastic device 5 is arranged successively, following plug 6, and shell 2, last plug 8 is with the core bar 9 and the leap body 10 of second elastic device 7.Cross over body 10 apparatus is connected with (figure does not show) funicular system, funicular system can be any standard type, and apparatus 1 in well, is for example located in the oil well or the natural gas well.

In shell, see Fig. 9 with last plug 8() adjacent, also have the copestone spare (keystone) that fuse or initiator are arranged.Copestone spare 11 is the effective bayonet socket electrical connectors between the parts of apparatus, thereby forms the earth-return circuit by instrument body.

Following elastic device 5(sees Fig. 2) in have a king-rod 12 ', three spaced

rings

12,13 and 14 and loose collar 15 are installed above.Have two apart from one another by spring assembly, each forms a pair of ectotropic arcuate tab spring 16, be pivotally mounted in the

ring

12 and 15 between.A helical spring 17 is arranged, between

ring

13 and 15 around king-rod, another helical spring 18, between

ring

15 and 14 around bar 12 '.Ring and bar be with suitable material manufacturing, as steel etc.

The suitable material manufacturing of following plug (Fig. 3) such as steel etc., a main body that conical butt protruding end part 19 is arranged is arranged, and the cylindrical part roughly 20 in band horizontal thread hole 21 arranged, when injecting the cylindrical part of plug in the shell, shoulder 22 is against the free lower end of housing, and the eyelet on screwed hole 21 and the housing aligns.Can insert and tighten with screw or similar device then, make plug 6 and housing 2 fixing.Frustum of a cone protruding end 19 is also similar, and splined hole 23 is arranged, and holds the splined end 24 of bar 12, and a transverse holes 25 is arranged, and puts the fixture such as screw.The end 24 of bar 12, the oblique shoulder 26 in the hole 23, a part 27 that diameter is less is led in hole 23, and part 27 is led to conical portion 28 again, and its end is led to an escape orifice 29 that stretches along the longitudinal axis of a plug again, reaches the surface 30 of part 20 then.Escape orifice 29 by the hole part 28 and 27 and escape orifice 31 connect, escape orifice 31 reaches the splined section in hole from the external surface 32 of frustoconical protruding end 19.Because there is spline in the hole, so between surface 30 and surface 32, liquid flowing channel is always arranged.Plug is roughly cylindrical under shoulder, and only there is plane 33 at two places, helps plug and inserts housing.

Last plug 8(Fig. 5) hollow stem of making for the suitable material of using such as steel.An end 34 is arranged, the upper end of inserting housing 2 during for running, shoulder 35 is against the last free end of housing 2, screwed hole relative on diameter 36 is arranged, when 8 assemblings of housing 2 and last plug, hold the installed part of screw thread in the through hole that is inserted on the housing 2 and so on, housing 2 and hole 34 over against.

The end in addition of last plug has an internal construction shape, hold copestone spare 11(and see Fig. 9), a fuse is arranged in the copestone spare 11, the planform that an outside is arranged again, lay the lower end of the core bar 9 in the running, it mainly acts on is that centralizer is gone up in carrying, and forms an external surface between the cutter (being shell 2 and its annex) of crossing over body 10 and apparatus.

An inner structure shape 37 is arranged on one end of core bar 9,, in the planform 38 on the other end, hold and cross over part 10(Fig. 7) in order to be enclosed within on plug 8 and the copestone spare 11.Core bar 9 has a steel pipe, its central copper bar and steel pipe insulation, and as leap body 10, and the wet contact between the copestone spare 11 and the blasting charge.On the external surface of core bar, it adorns second elastic device, or goes up fixed middle part 7(Fig. 8).Going up fixed middle part has two relative spring parts, and form respectively is two substantially parallel sheet springs 39, and is outwardly-bent.One end of spring 39 is fixed on the ring 40 with screw 43.Ring or the eckband 41 of ring 40 on the core bar, the other end are with screw 44, and being fixed on one can be on the eckband 42 that slides on the core bar 9.Ring 42 can be in vertical adjusted position of core bar 9.Eckband 41 has a hole 45, holds the fixture such as allene screw.Eckband 41 is slided along core bar, correct axial location, set up correct length, with the external diameter of correction spring 39, or the overhanging degree of side direction, adapt to the internal diameter of concrete boring, and utilize the hexagonal retaining thread on this position, to lock.Spring 39 then, and ring 40 and eckband 41 can upwards slide, and be disconnected from each other, and not adjacent to each other, then may become a less external diameter rather than excessive external diameter, just can be not stuck in well, see for details hereinafter described.

Apparatus 1 is the assembly that one group of straight line links to each other basically, mainly relies on plug to insert the dirt joint and is connected to each other, and is symmetrical around common longitudinal axis, forms the whole linear structure of a compactness.

Sheet spring 16 and 39(arrange around apparatus axis symmetry) when making farthest lateral extension, can be supported on the inner surface of pit shaft 4, especially on the position that aligns with the drill collar (not shown), apparatus in pit shaft is decided at the higher level but not officially announced.And, when apparatus 1 is transferred in pit shaft 4, fixed in part 5 and 7 can breathing, thereby apparatus 1 can pass through from the narrowest part in aperture, still can be fixed inside in.This breathing 15,40 and 42 is facilitated by ring, when

sheet spring

16 or 39 crosses that wellhole narrows, spring by inwardly towards the axis compressing of apparatus,

ring

15,40 and 42 along divide other bars 12 ' or core bar 9 slide the turning-in of adaptation spring.After passing through narrow,

spring

16 and 39 if decide middle part down, then increases the power of

helical spring

17 and 18 because the elasticity of itself are outwardly-bent again again.

Therefore apparatus 1 can pass through the narrowest aperture of pit shaft, yet even in the wideest part of boring, in also always can deciding.Like this, when explosive initiation, can guarantee explosive force transversely, be evenly distributed, this pit shaft is cut off around device at pit shaft.Implement apparatus of the present invention, can cut off the drill collar that rugosity reaches 9.5 inches (about 24 centimeters).Explosion time, the escape orifice 29 of following plug can discharge the fluid such as seawater, try hard to eliminate back-pressure at explosion time.

Referring to Figure 10, apparatus 100 is similar to apparatus 1, and function is also similar.Yet an elongate member 101 is arranged between housing 2 and last plug 8, and itself is connected with core bar 9 again, puts copestone spare 11.Copestone spare 11 is by a hot wire 102, is connected with a initiator 103 in being placed on elongate member 101, and initiator is placed in the hollow inside of elongate member 101." plug " 104 that elongate member 101 has a diameter to reduce, the fuse of wherein being rivals in a contest igniting, and to a fuze cap 105(fuse cap of the explosive initiation in the housing 2).The elongate member 101 of ground wire 106 and initiator 103 is connected.

Be appreciated that the modification that to take other.For example, in down fixed in the part 5, can use with shown in use the screw diverse ways, spring 16 is fixed on ring 12.Therefore, on the ring groove can be arranged, put into the end of every spring 16, an annular elastomeric spring buckle be arranged the fixed-site of spring 16.And, can also arrange cannelure on 110 at ring, the end of spring 39 is placed on the groove, to the edge of spring and groove carrying out upsetting,, make the spring jail fix and spring 39 is fixed on and encircle on 40 the edge turnup.

Make the apparatus of diagram and narration above with reference to accompanying drawing, can resist very high temperature and pressure, and operation and rugosity (diameter of the drill collar that need cut off just) close fit.

It will be appreciated that can be one group to the amplification of this apparatus comprises the above parts of described each ingredient.

Claims

1, a kind of apparatus that cuts the pit shaft drill collar, be characterized as one and deposited quick-fried medicine housing (2), housing (2) be used to insert cylindrical pit shaft (4) drill collar near, and device (3) by being connected with pit shaft one end, housing (2) substantially in pit shaft (4) is decided at the higher level but not officially announced.

2, as the apparatus in 1 of the claim the, being characterized as the flexible device of centering device (3) (5,7) can radially bend, thereby adapts to the vary in diameter of pit shaft (4).

3, as the apparatus in 2 of the claims the, be characterized as the end of first elastic device (5) at housing (2), second elastic device (7) is on the axial opposite end of housing (2).

4, as the apparatus in 3 of the claims the, being characterized as elastic device (5) has the arcuate tab spring arrangement (16) of spacing, be placed on the long elements (12 '), elastic device (7) has the arcuate tab spring arrangement (39) of spacing, is placed on the long elements (9).

5, as the apparatus in 4 of the claims the, be characterized as two pairs of arcuate tab spring arrangements (16) are arranged in first elastic device (5), two are placed on relative both sides on the diameter of long elements (12) to (16), the opposite end of spring assembly (16), with corresponding ring (12 around long elements (12 '), 15) fixing, a ring (12) and long elements (12 ') are fixing, and another ring (15) can be gone up at long elements (12 ') and slide.

6, as the apparatus in 5 of the claims the, be characterized as slip ring (15) at other two rings (13,14) between, a helical spring (17) is arranged around long elements (12 '), and one of in other two rings between ring (13) and the slip ring (15), a helical spring (18) centers on long elements (12 '), and between another ring (14) in slip ring (15) and other two rings.

7,, be characterized as being fixed on the corresponding ring (12,15) of opposite end of arcuate tab spring arrangement (16) with pivot as the apparatus in 6 of the claims the.

8, as the apparatus in 6 of the claims the, be characterized as arcuate tab spring arrangement (16), fix with the spring band device of corral retainer ring (12).

9, as any one apparatus in 4 to 8 of the claims the, being characterized as has two pairs of semielliptic spring devices (39) in second elastic device (7), and this two couple (39) places in the relative both sides of long elements (9) diameter; The opposite end of spring assembly (39) is separately fixed on the ring (40,42) of corral long elements (9); Ring (42) is fixing; Ring (40) is gone up at long elements (9) and is slided; With the initial position of the adjusting slip ring of the device (41) on the long elements (9) (4), thereby the maximum side direction of setting arcuate tab spring arrangement (39) is overhanging.

10, as the apparatus in 9 of the claims the, being characterized as has a ring (41) in the adjusting device; Locking ring (41) has locking device (45), thereby ring (41) can lock on the position of wanting of what is the need in office along the length of long elements (9).

11, as the apparatus among claim the 9 or the 10th, be characterized as the end of semielliptic spring device (39), the method by crimping goes up fixing at retainer ring (42).

12, as any apparatus in 9 to 11 of the claims the, being characterized as has a core bar in the long elements (9), above the energising joint of installing apparatus (1); Core bar (9) has a steel main body and the microscler copper bar insulation in it.

13, as the apparatus in the claim of any prostatitis, be characterized as plug device (6,8), the corresponding long elements (9,12 ') in housing (2) and first and second centering device (5,7) is connected; Each plug device has two cylindrical parts that diameter is different, thereby provides centering device (5,7) and housing (2) for plug jack joint.

14, as the apparatus in the claim of any prostatitis, be characterized as on the end that crossover device (10) is installed in core bar (9) away from housing (2), apparatus (1) is connected with a cable suspension.

15, as the apparatus in 3 to 14 of the claims any, being characterized as in the centre of housing (2) and core bar (9) has a microscler elongate member (100), and an initiator (103) is arranged in elongate member (100).

16, as claim the 13 apparatus in any in the 15th, being characterized as plug device (6) has eduction gear (29), thereby when explosive charge, can be compression wave in the pit shaft (4) and/or water dissipation.