DE2237235A1 - DEVICE FOR CAPTURING A LONGITUDINAL ELEMENT, FOR EXAMPLE A DRILL COLUMN, IN A DRILL HOLE - Google Patents

Description

Device for catching an elongate element, for example a drilling column, in a bore hole

The invention relates to a device for catching a elongated element, for example a drilling line, in a borehole by enclosing and tensioning a sleeve or "sleeve" around the top of the element under the Effect of a pull exerted on this cuff.

A device for extracting an elongated element wedged in a borehole has already become known, which in combination comprises: an operating rod, one end of which is to be inserted into the borehole, © in extension element the operating rod at this end, where

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_ ₂ _ 223723S

the extension element is firmly connected to the actuating rod, one of a grid or network of threads, cables or metal strands existing cuff within the extension element, the The end of this cuff is attached to the extension element on the one hand and to the actuating rod on the other and the cuff is designed so that it covers or covers the elongate element, means for releasing the extension element and operating rod and means see below «exciting wrapping of the cuff around the elongated Element, whereby a gripping of the elongated element by relative axial displacement of the extension element and the Operating rod is ensured,

This known device has proven to be very useful in practice proven effective. In the event that the device is used to insert a piece of flexible drilling pipe. long and difficult operations have to be carried out beforehand on the upper ejide of this drill pipe section or section make so that the reinforcements forming the flexible line are not spread and insert them Allow conduction into the cuff. These operations are all the more difficult to perform, the more flexible Line is supported against the borehole wall and describes a spiral and in this way prevents the device from being lowered into its working position. Barber also It is necessary in this device that the drilling column is pressurized to trigger and a Allow lengths of the cuff.

According to the invention, a device should be provided before all bings be proposed which allow avoiding the said guard parts and which are simple, even for trapping a flexible line, which consists of spiral windings, can be easily manufactured and in which the Borehole does not need to be placed under bridge, in which it is rather possible, the lower end of the sleeve

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to anchor against the elongated element what a better one Enclose. This cuff around the elongated element receive permitted «

The invention relates to a device for trapping an elongate element, for example a drilling line in a borehole, which is characterized in combination by;

a) at least one upper tubular element,

b) at least one lower tubular element,

c) a tubular, cuffed one Intermediate element, which is intended to bsw around the elongated element to be captured. closed to become; and which at its ends against the upper tubular element and against the lower tubular element Element is anchored, this intermediate element with this upper element via first detachable connection units is connected and is connected to the lower element via detachable connection devices.

An example embodiment of the invention will now be explained in more detail with reference to the accompanying drawings, in which:

Figures 1 and 1A each the upper part and lower rope show this device;

Figures 2, 2A; 3, 3A; 4, 4Aj 5, 5A; 6, 6A and 7, 7A show the successive stages of realization the device for catching an element of a drilling pipe in a borehole,

Figures 1 and 1A show the upper part and the lower part of a catching device according to the invention, designated as a whole by the reference numeral 1 and vertically over a operating rod 2 connected to the surface is held. This device comprises: a hanging head with three tongues 33, upper tubular elements 4 and 5,

which are interconnected, as well as a tubular

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lower element 6, which extends downwards through a shoe 7 is extended.

A tubular intermediate element Θ, which is the tubular upper element 5 and the tubular lower element 6 connects, is covered with a sleeve or sleeve 9, which with their ends in the tubular elements 5 and 6, respectively is anchored.

The tubular intermediate element 8 is in its position through Balls 10 held, which engage in a Hingnut 11, which is machined in the tubular upper element 5, wherein these balls are held in place via a locking ring 12 which has an annular groove 32 and in its outer wall has an inner shoulder 50 in its inner wall. Of the Ring 12 is in its lower position, for which the groove 32 is calibrated not located at the level of the balls 10 * held by a spring 13, which is against a shoulder of the ring 12 and against supports the lower part of the head 14 of the tubular intermediate element β, which is integral with the latter, for example connected by a thread. The intermediate tubular element θ comprises, within its upper part, tongues 15, which are blocked by the locking ring 12.

The tubular lower element 6 is integral with the lower one tubular element 8 connected via shear pins 16.

Positioned in the inner wall of the shoe 7 and through the tubular cover 17 are held tongues 19 and jaws 20. The tubular cover 17 is against the Baals of the tubular element 6 locked by shear pins 18.

The gate direction is used in the following way:

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Ιώ Inside the borehole 21 there is a drilling column 22, which is formed, for example, by a flexible line which is broken. After determining the depth at which the break occurred, the drilling column is cut off by means of a suitable device' - ₉ which may be of any known type so as to facilitate subsequent operations.

The depth at which the line 22 is cut becomes recorded beforehand. The interception device is then lowered. 1 over the operating rod 2 to a level above that where this cutting was carried out (let for example a distance of one meter between 7 and 22) and the interception device 1 is completely shut down or makes them immobile.

If the interception device 1 is stopped, it is lowered over. their axial bore (FIGS. 2 and 2A) from a centering and aligning tool, which is designated as a whole with the reference numeral 23 and is suspended from an actuating column 24, wherein, for example by a thread, the definition the arrangement takes place. The tool. '23 is exposed 4 parts together: a lower one made of an expandable or spreadable tool 25 »which is provided with jaws, which are radially priced by hydraulic actuation can; from an intermediate pipe 26; a centering body 27 on which small tongues 28 are arranged and the one Annular groove 29 includes; as well as a head 27a, which with the Zen «~ trier body 27 is connected via shear pins 35 (Fig «6). The expandable tool 25 is inserted into the drilling column 22 and then fluid under pressure is sent into it expandable tool 25 via the actuating column 24 »the centering head 27a, the centering head 27 and the intermediate tube 26a The jaws of the tool 25 catch or catch spreading against the inner wall of the drilling column 22,,

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The pressure of the fluid in the expandable tool 25 is kept constant, one then ensures (Fig. 3 and 31) for a train on the tool 23 via the actuating column 24 to the flexible drilling line 22 to be arranged substantially in the axis of the borehole and vertically, which spiral was arranged against the borehole wall.

The train is then maintained so that the drilling column is kept vertical; the hydraulic bridge is also held upright in tool 25. If the arrangement is fixed or made immobile, one can now (Fig. 4 and 4A) lower the interception device 1 around the line 22. The top of the drilling line 22 enters the shoe 7 and then comes into abutment at 36 against the interior of the tubular cover 17; the pins 18 shear under the Influence of the weight of the device 1 from that at 36 on the drilling string supported vertically by tubular member 24 is at rest. The tubular cover 17 is then unlocked and for this reason first gives the clamping jaws 20, then the tongues 19 free, which come into abutment against the column. As can be seen in the following, these jaws 20 and these tongues 19 contribute to the lifting of the drilling pipe.

The interception device 1 continues down until the su Moment where (Fig. 4) the tongues 28 are supported against the inner shoulder 30 of the locking ring 12; this Ring 12 comes into abutment against a shoulder of the head of the tubular intermediate element 8. If the ring 12 is in this upper position, the tongues 15 released, which are looking for their place in the groove 29 of the centering 27. The annular groove 32 is then in the unlocked position of the tubular intermediate element 8, which until then was firmly connected to the tubular element 5 via balls 10. The lowering of the fall arrester 1 has ended.

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The hydraulic bridge is lowered in the expandable Werkseug away.

Sin Seteen or yielding of the drilling column 22 is prevented by the tongues 19 and the clamping jaws 20. By means of the actuating column 24 one exerts (FIg * 5) a pull on the tool designated as a whole with BeKugszeichen 23. The locking balls 10 are driven out of the annular groove 11 and sit in the hanging groove 32, as a result of which the tubular intermediate element 8 is unlocked with respect to the upper tubular element 5. Under the influence of the pull that the actuating column 24 exerts on the tubular connecting element 8, the pins 16 are sheared off and the tubular intermediate element 8 is detached from the lower tubular element 6 as the tubular intermediate element 8 moves away from the lower element 6, the casing gradually becomes or cuff 9 released, as can be seen from the upper arrow in FIG. 5A.

After aas tubular connecting element 8 completely the Cuff 9 (Fig. 6 and 6A) has released, this anchored (Fig. 6 and 6A) in the suspension head 3 on the Tongues 33 "which have taken their place in the annular groove 34 provided for this purpose in the head 14 of the bush 8"

One exercises (FIGS. 7 and 7A) by means of the column 24 a last move on Werkseug 23. Since the centering head 27a is firmly connected to the centering body 27 via pins 35 (Fig. 6), the latter are sheared off; Centering head 27a and tubular element 24 are raised again to the surface to facilitate the final operation. The tool 23 remains suspended by means of the tongues 15.

The final operation is to pull a train the upper! ax of the safety gear 1 over the set actuators & gs-

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rod 2 exercise in such a way that it is ensured that the sleeve 9 closes around the drilling line 22, which at both of their ends on the tubular elements 5 and 6 is anchored.

The tongues 19 and the clamping jaws 20 ensure that the lower element 7 is fixed or moved against the flexible line when lifting the assembly again, whereby in this way every relative sliding of the drilling column, against the lower part of the cuff is prevented, which Io lower element 7 is anchored, whereby an effective Enclose up to. Clamping the cuff (sweep the Wall of the drilling column is ensured.

As can be seen from the foregoing, in the case where a fluid is circulating in the borehole, this circulation is necessary are not interrupted during the snap operations.

On the other hand, in the case where the oineui'angendc drilling column is a rigid column, you can optionally - and without leaving the scope of the invention κα - not use the centering * factory 23 if the upper end of the column enables the correct operation of the catching device. Of course it is in this case advantageous to provide _t of the wellbore, the lower end of the Torrichtung with a crown sum re-dissolving to the operations at the! 5Inbringung the device about the rigid drill string he iu "easier.

- patent claims -

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Claims (8)

Äff ,: 1189 PAIEIIAISPARATIONS: 1 ο device »to capture an elongated element marked in a borehole, for example a drilling line in combination by: a) at least one upper tubular element, b) at least one lower tubular element, c) a tubular, lined with a cuff b »w. covered tubular intermediate element, wherein the sleeve dassu is intended to be braced against the elongated element to be captured and to its Ends anchored against the upper tubular member and against the tubular lower member, the Intermediate element with this upper element by first releasable connecting devices and with this lower one Element through »wide detachable connecting devices connected is", 2. Apparatus according to claim 1, characterized by a centering and aligning tool for the elongated to be captured Element which is arranged at the lower end of an actuating column and means for positioning of the elongated element to be captured, the arrangement of these preceding elements freely downward let slidable along this column until the the upper part of the elongate element to be captured is included, the centering tool means for separating 209886/0287 - ro - this first means for releasable connection and for lifting the intermediate element by lifting the column and separating the second releasable connection means, such that the cuff directly against the daa elongated element to be captured is spanned by a tension exerted on the upper tubular element being, the upper tubular element in its upper part means sram hanging this tubular intermediate · having eleaentee in a raised position. 3. gate direction according to claim 1, characterized in that that these first releasable connecting devices consist of at least one locking element, which in an opening of the upper part of the tubular intermediate element is mounted and engages in a recess in the inner wall of this upper tubular element, this element being held in place by the outer wall of a locking ring with a separating cavity, which is held at a level different from that of this locking element by elastic means which is supported against a shoulder of the inner wall of the tubular intermediate element. 4. Apparatus according to claim 2, characterized in that the centering and aligning tool for the elongated element to be captured with an organ in its lower part hydraulic actuation which can detect the element to be captured. 5. Device according to one of claims 2 or 3, characterized characterized in that these facilities eum separating the first detachable connection and lifting devices for the tubular intermediate element are formed by at least one with an inner shoulder of the locking ring, a tongue that acts as a standard. 209886/0287 6. Apparatus according to claim 1, characterized in that said lower tubular element anchoring elements for this lower tubular element to be captured on the elongated one Element, these anchoring devices being covered by a tubular cover, the upward releasing the anchoring device are slippery. . 7. Apparatus according to claim 6, characterized in that that this tubular cover (cache tubulaire) firmly with this tubular lower element over at least connected to a seer's pen. 8. Device according to one of claims 2 or 3, characterized by means for releasing this centering tool and the drilling column and for supporting the separators against a shoulder of the head of the upper one tubular element by means of the locking ring; and by means of holding this centering and Alignment tool after detaching it from the actuation column. X X 203888/0287 Blank page