DE2338266A1 - METHOD AND DEVICE FOR INSTALLATION OF A PIPE MOUNTING ELEMENT IN A DEEP HOLE - Google Patents

Description

Method and device for installing a pipe suspension element

in a deep borehole

Priority: July 27, 1972 / V.St.A. Registration no .: 275 576

The invention relates to a method and a device for installing a pipe suspension element in a deep borehole and is particularly concerned with installing and sealing a drill string hanger in an oil or gas well.

In the past few years the bringing down of Offshore drilling and other subsea drilling for production of petroleum and natural gas has increased significantly and requires special plants and equipment. When drilling underwater an outer standpipe or guide pipe is first rammed or driven into the seabed. Then it will

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a riser or formwork pipe is connected, which extends from the guide pipe to the turntable on the surface. from the drilling device arranged on the surface, a borehole is driven into the seabed in order to be in the guide tube to attach a drill pipe hanging. The drill pipe hangs from the guide tube with the help of a suspension element that is supported by the guide tube. An inner riser extends from the suspension element to the drilling surface.

To get the drill pipe in place in the newly laid To keep the borehole, the borehole is cemented out. To do this, cement is poured through the inner riser pipe and through the drill pipe derived. The cement is forced out around the lower end of the drill pipe into the annulus, the is formed between the borehole wall and the drill string. By calculating the volume of the input space, it can be determined be about how much cement is needed to reach a certain height in the annulus. When the cement is the one you want Has reached the height, the annular space above the cement surface is closed with a sealing element. this The overall sealing element is in the vicinity of the pipe suspension element arranged.

Most underwater suspension arrangements require the ■ pipe suspension element and sealing element to be separately inserted into the bore be introduced. It takes a great deal of expense and time to install the pipe suspension element first, then cement

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fill and finally introduce the sealing element. Therefore, it is desirable to have a pipe hanging element and a sealing element to be introduced into the bore in a single operation, i.e. in just one pass.

Harnesses that work with a single stroke and. Pipe suspension element and sealing element straight into the Drilling a hole emerges from the following US patents: 3,638,725, 3,492,026, 3,489,436, 3,468,559, 3,460,615, 3 382 921, 3 335 799 and 3 279 539.

U.S. Patents 3,460,615, 3,382,921, 3,279,539, and U.S. Patents No. U.S. Patents 3,638,725, 3,492,026, 3,489,436, and 3,468,559 show a retraction device or a drive-in harness, the one axial movement of a part of the landing gear opposite another part allowed. The latter group of four U.S. Patents and TJS Patents 3,382,921 and 3,279 show an arrangement in which the outer portion of the retractable harness is in sealing engagement with the sealing element Brings pipe suspension element. In the said group of four

in the

US Patents and US Pat. No. 3,279,539, the sealing element is connected to the outer part of the landing gear.

The group of four US patents shows a sealing element with two parts connected by ball bearings are. U.S. Patents 3,492,026, 3,489,436, 3,468,559 and 3,460,615 show an arrangement with a protective device in the form of a shell or sleeve. From U.S. Patents 3,638,725,

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3,492,026, 3,489,436, 3,460,615, 3,382,921, 3,335,799, 3,279,539 and 3,273,646 show that the impurity of light ^ it with a rotation of the drive element to the right te · VCt '"t will. U.S. Patents 3,638,725 and 3,279,539 show da3 rrs :: r.e.i of the drive-in harness from the pipe suspension element by eir.o rotary movement to fix the seal and the annchlieiotvia Lifting the drive-in harness.

The known arrangements have proven to be inadequate since they require a direct connection between the sighting device and the pipe suspension element. In general, this connection is a screw thread engagement between the sealing element and the pipe support. However, such a connection causes difficulties if the seal is not properly disordered on the first attempt so that the seal comes out of the bore again. roughly 3 £ «■> must be taken and used again. If ulo seal is drilled namely the second time mu3 boi the built-up connections, the Einfahrgeschirr the Gewindeanfanr- Rohre.ufhängelement to find screw around the seal elements on daa Rohraufhängelement and the seal fixing to k:; .- nr - n.

first
If the leading / Jewindegang has been damaged int, λ:;: ϊ.ι daa

Sealing element never re-engaged Ker

A connection between the sealing element and the « Pipe suspension element requires a special Hohraufh-asele as some types of connections on the suspension element are not required must be formed in order to establish a connection with the sealing

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BADORIQlHAt "^

element to be able to manufacture.

A combined device for compressing the Sealing element and for fastening the pipe opening element in the bore is in the "US-PS 3,540,533 pe ze Igt.

The object of the invention is to provide a method and a Device for introduction

of a pipe suspension element in a deep borehole, in which the disadvantages of known devices are generally avoided and a secure seal is guaranteed even if the first attempt at assembly does not succeed immediately.

The invention is based on a method and a device for installing and sealing a'Hohlrohr- or BohrgestängelstÄNgelement- within a pipe head a. The device according to the invention has a retraction device or a drive-in harness that has an outer part with it is detachably connected to an inner part. The Ciu ^ ere Part 1st releasably connected to a sealing arrangement, while the inner part is releasably connected to the suspension element. if the suspension element is deposited within the bore the outer part separated from the inner part and the sealing arrangement in its position between the hanging element and the Pipehead lowered. There is no connection between the sealing arrangement and the suspension element, so one of the usual ones A suspension element corresponding to the standard can be used.

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The outer part of the bin driving harness turns to the right, around rotated, and this causes a latch to expand or widen, whereby a bolt attached to the seal assembly, is actuated by compression effective seal, which then seals the annular space surrounding the suspension element. The extended one Hiegel holds the sealing arrangement in its position and blocks the hanger in place within the bore.

The invention has the further advantage that the sealing arrangement, if the seal does not properly seal the first attempt, pulled out of the borehole can be and when driving again into the borehole no leading thread has to be found around the sealing arrangement re-engage and operate the seals within the wellbore.

The invention is thus concerned with the piping of Boreholes, with a hollow pipe or drill rod suspension element on a first part of a downhole tool and a seal assembly on a second part of the same tool is attached hanging. The first and the second part are with each other releasably connected, so that after the suspension element has been set down within the borehole, the first part from the second part released and the sealing arrangement is lowered into sealing position independently of the suspension element. Part of the seal assembly is rotated to cause a tension ring or expansion ring to engage an annular groove in the suspension element,

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• thereby actuating the sealing arrangement and the sealing arrangement and the suspension element is blocked or locked in its position.

The invention is illustrated with advantageous details with reference to schematic drawings of two exemplary embodiments Inventive devices explained in more detail. Show it:

Fig. 1 is a section through the environment in which the invention is used}

2 shows a section through part of a first exemplary embodiment of the invention after the suspension element has been removed;

Figure 2A is a perspective view of a J-slot joint for a protective sleeve;

3 shows a section through part of the first embodiment after lowering the seal assembly into place;

4 shows a section through part of the first exemplary embodiment after widening the bolt used to hold it down;

5 shows a section through part of the first embodiment after the release of the sealing arrangement and the renewed engagement of the retractable gear;

6 shows a partially sectioned, partially perspective view of a bayonet catch; Fig. 7 is a section through part of the first embodiment

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management example after loosening the retractable harness from Suspension element;

8 shows a section through part of a second Embodiment after the suspension element has been set down;

Pig. 9 shows a section through part of the second embodiment after the sealing arrangement has been lowered and the bolt used for holding down has been widened;

Fig. 10 is a section through part of the second embodiment after the release of the sealing arrangement and the renewed singriff of the Einfaiirgeschirrsj

11 shows a section through part of the second embodiment after releasing the drive-in harness from the suspension element;

12 shows a section through a multiple installation of the device according to the invention.

The invention relates to a method and a device for running in a hollow pipe or drill rod hanging element and a sealing arrangement in a petroleum or natural gas well in a single trip of a drive-in gear. The invention is useful in a wide variety of environments. Fig. 1 shows its application in a hole in the Sea floor off a coast.

In connection with Fig. 1 it should be explained that of a drilling device not shown here, for example from a Jack-up platform with floating platform or supported platform, a first pipe or standpipe 10, a second pipe or guide

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tube 12, a wellhead 14 and an outer riser or guide tube 16 are lowered and installed in the seabed 18 are. The guide tube 12 can be driven or rammed into the seabed 18 so far that the wellhead 14 rests near the bottom. If the soil conditions require it, a hole can also be drilled to use the guide tube 12. The outer riser pipe 16 extends from the wellhead 14 to the drilling device, not shown here.

Through the outer riser pipe 16 and the guide pipe 12 a drilling rig is lowered to dig into the ground Drill hole 20 for a third pipe or casing pipe 22. Through the outer riser pipe 16 is a pipe head 24 on which the casing pipe 22 is attached in a hanging manner, lowered until the pipe head 24 is seated and connected to the wellhead 14 will. An inner riser pipe is connected to the pipe head 24, which extends up to the drilling device, not shown here extends. The drilling apparatus is then lowered through the inner riser 26 to a borehole 28 for the drill string 30 to drill.

Figures 2 to 7 show a first embodiment of the device according to the invention. 1 shows a hollow pipe or drill pipe suspension element 32, from which a drill pipe 30 hangs down, with a riser pipe or θLa worker pipe string 34 extending up to the drilling device for remote assembly. tig, 2 doughs lh individual the combination

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Working pipe string 34, from which a drilling device or a drive-in harness 36 hangs down, on which in turn a sealing member or a sealing assembly 38 and the suspension element 32 are attached depending in the borehole 28 of the bore are.

The drive-in harness 36 is connected to the working pipe string via a coupling member 42. The upper part of the Coupling member 42 is from a box 44 with an internal thread 46 formed with an external thread 48 on the spigot end 50 of the lowermost section of the working pipe string 34 is engaged. The lower part of the coupling member is formed by a pin end 52 with an external thread 54, that into an internal thread 56 at the upper end of the Einfahrgesqhirrs 36 intervenes. The threads 46, 48, 54 and 56 are shown as a right-hand threadable thread, as this is generally the case with oil and gas wells. The connections between the individual sections of the working pipe string 34 are also connections that are brought into right-hand engagement. This will make the connections by turning the work chain 34 to the right dressed. The advantage of the coupling member 42 is that that there is the use of working tubing 34 with different Diameter allowed. By simply exchanging the coupling element 42, a work pipe can be made 34 of a different diameter can be used.

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The drive-in harness 36 has two main parts, namely an outer cylindrical part or nipple 60 and an inner cylindrical part or hollow core ″ or mandrel 70.

At the upper end of the nipple 60, the internal thread 56 is arranged, which is used for connection to the pin end 52 of the coupling member 42 and at the lower end of the nipple is with a at the connection provided at 62, the sealing arrangement 38 is attached in a suspended manner.

The mandrel 70 is mounted hanging on the nipple 60 and having a screw thread 66 bajonettsversehlußartigen the _f in detail in FIG. 6 and described in U.S. Patents 3,442,536 and 3,421 _58o> connected to the nipple. On the outside of the mandrel 70, several tooth segments 68 extending in the longitudinal direction are worked out alternately on 30 ° wide segments, in which the arc length of the teeth is slightly less than 30 °. Corresponding tooth segments 74 are worked out in the interior of the nipple 60 at the top. These teeth also have an arc length of slightly less than 30 °. Although the teeth are shown overall with a buttress thread, it should be noted that other profile shapes can also be used.

The teeth are thus brought into engagement with one another. that the mandrel 70 is inserted into the nipple 60, the Tooth segments 68 are arranged so that they are between the tooth segments 74 slide through it. The lowest tooth 76 on the mandrel 70

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has twice the width, so that the Dora 70 must be inserted far enough into the nipple 60 in order to be able to insert the double-thickness tooth into a groove 75 in the nipple 60, which is also twice as wide. The mandrel 70 can then be rotated 30 ° in order to bring the bayonet lock 66 into engagement. A stop 72 is provided in the mandrel 70, which prevents rotation of the mandrel 70 within the nipple 60 after the toothed segments 68 and 74 have engaged with one another to have.

The toothed segments 74 on the nipple 60 are provided so far below the thread 56 that the bayonet lock 66 can be released and the sealing arrangement 38 can be brought into a sealing position, as shown in FIG Mandrel 70 and the lower end of the coupling member 42 in the sealing position. The toothed segments 68 are provided at the very top on the outside of the mandrel 70 in order to achieve the shortest possible distance between the thread 56 and the toothed segments 7 ^ on the nipple 60.

Below the toothed segments 68 there is an oversized seal 78 in an annular groove 80 in the outer surface 82 of the mandrel 70 added. The seal 78 may take the form of a O-ring or a T-ring which is in sealing engagement with the smooth, inner, sealing surface 84 of the nipple 60. The sealing ring 78 is so far below of the toothed segments 68 arranged that after loosening the bayonet catch 66 and lowering the sealing arrangement

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38 in sealing position, like Pig. 3 shows, is still in engagement with part of the surface 84 and never touches the lowermost tooth of the tooth segments 84. The main task of the sealing ring 78 is to enable a check or a pressure test of the sealing arrangement 38 after it has been actuated. In addition, the sealing ring enables a continuous seal during installation and sealing, so that no fluids from the borehole and other substances pass through the bayonet connection 66 .

A suspension element 32 with a screw thread connection 85 is suspended from the lower end of the mandrel 70. Here an external thread 86 formed at the lower end of the mandrel 70 is connected to an internal thread 88 which is provided in a box 90 forming the upper region of the suspension element 32. The connection 85 is a screw thread connection which is threaded in a left-handed manner, so that it allows the connection 85 to be unscrewed when the mandrel 70 is rotated to the right. A shearing device in the form of a shear pin 92 extends through the box 90 into a bore 91 in the mandrel 70 and prevents the connection 85 from loosening prematurely if a torque to the right is inadvertently exerted on the mandrel 70 during the loosening of the bayonet lock 66 described below will.

Below the bore 91 and above the thread 86 there is an oversized seal 94 in the form of an O-ring

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or a T-ring in an annular groove 96 in the outer surface 98 of the mandrel 70 added. The main task of this sealing ring 94 is to work with the smooth inner surface 100 of the suspension element 32 sealing engagement therewith the seal assembly 38 can be subjected to a pressure test. The sealing ring 94 also prevents fluids from leaking out of the wellbore or other substances pass through connection 85.

Fig. 2 shows the combination described up to here, as it is deposited in the borehole. The suspension device 32 has one radially extending, annular bead 102, which is formed with an in the interior of the pipe head 24 annular, constricting Shoulder 104 is engaged. This shoulder 104 forms the support for the suspension element 32 during engagement with the bead 1 02.

For cementing out the borehole for the drill string, there is a passage or channel from that between the casing tube 22 and the drill pipe 30 formed annulus 106 to the between the inner riser pipe 26 and the working pipe string 34 is necessary to guide the backflow to the surface. In the bead 102 there are openings in the form of channels or circulation passages ItO for fluid flow around the suspension element 32 provided around.

The mandrel 70 has a total of in its central section between the annular groove 78 at the upper end and the bore 91 at the lower end an area with indented diameter, the

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creates an annular channel 118. This area 112 is adjacent to seal assembly 38 ″ so that fluid between the interior of seal assembly 38 and outer surface 114 this area 112 can flow through »

A connection between the annulus 108 and the channel 118 produces a plurality of circulation openings 116, the in Pig. 2 are shown. In this way, fluids flowing back can through the annular space 106 upwards through the openings 11 0 into the channel 118 and flow through the openings 116 into the lüngraum 108.

The sealing arrangement 38 depending from the nipple 60 intended to seal the channel 11 8 against a fluid flow serve after completion of cementing out. The sealing arrangement 38 is connected to the lower end of the nipple 60 via the connection shown at .62. At the lower end of the nipple 60 a plurality of equally spaced raised surfaces are alternately formed with grooves 126. At the top of the seal assembly there are raised surfaces 128 and grooves 130 that mate with the grooves 126 and the raised surfaces 124, respectively cooperate and thereby form a kind of coupling. This arrangement enables a torque to be applied when the nipple 60 is rotated exert on the seal assembly 38. The sealing arrangement 38 is axially suspended by means of a shear pin 122 which extends through a surface 126 and into a bore 123 in the lower end of the nipple 60.

The sealing arrangement 38 has a connecting element 132, 309886/0500

which forms the connection at 62 at the upper end and is telescopically received at the lower end in a compression ring 134, which is rotatably connected to the lower end of the connecting element 132 via a ball bearing 136. That. Ball bearing 136 has a plurality of metal balls 138, which are in a race 1 4C in the outer surface of the connecting element 132 and in a Race 142 rotatable in the inner surface of compression ring 134 are included.

Against the lower end of the compression ring 134 is a inner, cylindrical packing space 150 and an outer one cylindrical packing element 151 from a cylindrical Stuffing box 152 held. The gland 152 has an annular shape Shank 153, which is supported by a corresponding annular groove 154 is received in the lower end of the compression ring 134. The shaft 153 is in the groove 154 by a plurality of set screws 155 out. and kept moveable from the outside extend through compression ring 134 into hat 154 and of corresponding vertical slots 156 in the upper portion of the shaft 153 are added.

The gland 1 5 ² has an inner and an outer annular shoulder 158 and 160, which hold the packing elements 150 and 151 supported against the compression ring 134. The shoulders I58, I60 and the lower end of the compression ring 134 control the expansion of the packing elements 150, 151 during compression, as explained in more detail below.

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A hold-down and compression device is attached to the sealing arrangement 38 and serves to hold the suspension element 32 in its position to lock and hold and to compress the packing elements 150, 151 so that they with the pipe head 24 and the hanging element 32 in sealing Intervene. This is achieved by means of an expandable or widening bolt 162 which is biased completely inward for example that shown in U.S. Patent 3,540,533 Type and by an actuating nut 164, which is in an area 166 with a recessed diameter in the outer surface of the connecting element 132 is received. The actuating nut 164 has a right-hand thread 168 on its inside, the with a right-hand thread 170 on the outer surface of the area 166 is in screw engagement. Above the actuating nut 164 an expandable latch 162 is attached.

The bolt 162 is made by turning the working tubing string to the right 34 actuated. In order to prevent the actuating nut 164 from rotating with the connecting element 132, is the actuator nut 164 on the top of the compression ring 134 attached by a coupling connection. For this finger-like projections 172 protrude from the lower end of the actuating nut 164 in corresponding recesses 174 in the upper Area of the compression ring 134. The set screws 155 and Slots 156 prevent the compression ring 134 and rotate the gland 152 relative to each other.

The stuffing box 152 is by a further coupling type 309886/0500

Connection held in place with the suspension device 32 is made. For this purpose, a large number of tabs or thumbs I76, which are inserted into recesses 178 in the lower region of the Stuffing box 152 are mounted "movably back and forth" from Springs 180 biased outward. The thumbs 176 are in the Recesses I78 held by locking projections 182. At. the sealing position shown in Fig. 3 engage the Thumb 176 in corresponding recesses 183 in the annular Bead 102 and thereby prevent the gland from rotating 152, compression ring 134, or actuation nut 164.

When rotating the connecting element 132 is therefore the actuating nut 164 held stationary because the connecting element 132 rotates on the balls 138. This will the actuating nut 164 due to the right-hand threads 168, I70 caused to move upwards. One formed at area 166 annular beveled edge 184 causes the expandable Latch 162 is moved outward when the actuating nut 164 pushes the latch 162. upwards. In the inner surface of the pipe head 24, an annular groove 186 is formed to receive the bolt 162. This annular groove 186 has an upper one and one lower frustoconical shoulder 187 through which the intake of the latch 162 is facilitated. The latch 162 has one leading, beveled edge 163, which cooperates with the interior of the annular groove 186 until the edge I63 on the upper truncated cone shaped shoulder 187 and thereby the latch 162 Wedged in place, like Pig. 4 shows. As a result, the upward movement of the actuating nut 164 is stopped and a

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ati-downward force exerted on the compression ring 134, when the nipple 60 is rotated further. The shaft 1 53 moves deeper into the groove 154 when the compression ring 134 the gland 152 with the outer surface of the suspension element 32 and the inner surface of the pipe head 24 together in sealing engagement.

When the operation of the seal assembly 38 is completed, it is found that the latch 162 is also the hanger 32 holds against the shoulder 1o4 and blocks and thereby any Movement of the suspension element 32 within the borehole prevented.

The connecting element 132 is provided with a device for provided hanging attachment of a further hollow pipe or drill pipe suspension element. Like Pig. 3 shows is an annular one Shoulder 188 inside the connecting element 132 for support of the next suspension element to be installed in the borehole. Below the shoulder 188, an annular groove 190 is formed which the retrieval of the seal assembly 38 with one here secondary facility not shown allowed. When installing the following suspension element, the additional weight of the Drill pipe that depends on this suspension element Sealing arrangement 38 and the suspension element 32 add further load.

As shown in FIGS. 2 and 2A, to protect the inner surface 194 of the pipe head 24 a sleeve-shaped or shell-shaped protective

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element 192 may also be provided. Often namely the critical surfaces damaged by the introduction of equipment through the flow bore. The protective sleeve 192 is at the upper end 196 of the connecting element 132 attached with a J-slot joint 197. The J-slot

or L-shaped slots

Connection 197 has a number of J-slots / 199 in the lower End of the protective sleeve 192, which receive the corresponding pins 201, which at a region 203 with a retracted diameter are provided on the connecting element 132. In the upper area of the Protective sleeve 192 is provided with a connecting device which a fishing tool can engage in order to protect the protective sleeve, to be removed before installing another suspension element. 2 shows the connecting device in the form of an annular groove 198 with vertical slots 199 in the upper inner surface of the Protective sleeve I92. Stops not shown here are within of the annular groove 1 98 is provided to form a plurality of J-slots.

To carry out the method according to the invention, the arrangement of the suspension element 32, sealing arrangement 38 and drive-in harness 36 is connected to the last section of the drill rod. The first section of the working pipe string 34 is then attached to the drive-in gear 36 and the entire assembly is lowered into the borehole, successively further sections being attached to the working pipe string 3 ² I- until the bead 1 02 of the suspension element 32 on the shoulder 1 04 in the pipe head 24 seated.

■ After placing the suspension element in the borehole

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through work tubing 34 and through the drill pipe Cement piped down. When the appropriate amount of cement has been poured into the borehole, one will be here Stripping plug, not shown, is inserted into the borehole and fluids are introduced into the borehole, which the cement around the Press the lower end of the drill pipe 30 around into the annulus 106 until the cement has reached the desired height.

To complete the annulus 106, like Pig. 3 shows that the nipple 60 is separated from the mandrel 70 by rotating the nipple 60 by 30 ° to release the bayonet lock 66 . The work tubing string 34 is then driven further into the wellbore to further advance the seal assembly 38 and force it into a sealing position if necessary.

With reference to Fig. 4 it should be mentioned that the connecting element 132 by turning the working pipe string to the right 34 is rotated, causing the operating nut 164 upward is moved. The bolt 162 expands into the annular groove 186, and upon further rotation, the packing elements 15 and 151 are compressed. When they are squeezed, stand they are in sealing engagement with the outer surface of the suspension element 32 and the inner surface of the tube head 24.

The seal assembly 38 is then tested by pressurizing the annular space 108. The flow bore in the work pipe string 34 and in the drill pipe 32 is Observed on the surface to avoid possible leaks

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to be determined on the sealing rings 78, 94. When the seal assembly 38 is leaky, there is a pressure drop in the annulus 108 established.

If a leak is found, so will the sealing arrangement 38 by turning the connecting element to the left t32 is brought out again, because this makes the Actuating nut 164 moved downwards, the bolt 162 released, so that it can withdraw from the annular groove 186 when the working tubing 34 is pulled, thereby removing the seal assembly 38 can be raised from the sealing position, canoe.

The upward movement of the work tubing 34 is continued until the shoulder 73 in the nipple 60 below the toothed segments 74 with the lower toothed segments 76 in Intervention occurs. Then work tubing 34 becomes right rotated around, with the gear segments 74 and 68 keyed like one Acting connection through which the left-hand screw thread connection 85 receives a drive until the engagement with the suspension element 32 is completely released. then For example, the lead-in harness 36 can be pulled out of the wellbore and the sealing difficulties of the seal assembly 38 eliminated will.

The seal assembly 38 can then again on the

Nipple 60 are lowered into the borehole and brought back into the sealing position, as already described. Needs

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to reengage the seal assembly 38 no leading thread to be found, since an engagement only with the smooth neck of the suspension element 32 and the smooth bore must be made in the pipe head 24 with the simple inner ring groove 186 formed therein.

If no leaks are found, so. the nipple 60 is detached from the connector 132, like Pig. 5 shows. The shear pin 122 is broken by an upward force on the work tubing 34 as the seal assembly 38 is held in place with the aid of the bolt 162.

Then the bayonet lock 66 is engaged again and the screw thread connection 85 is released, as already described, so that the drive gear 36 can be pulled out of the drill hole.

In the second embodiment shown in FIGS. 8 to 11, instead of the bayonet lock 86, which is Has first embodiment, a screw thread connection 200 and a bolt connection 202 with Eeibungssitz to Connecting a nipple 204 to a mandrel 206 is provided.

Like Pig. 8 shows the mandrel 206 has a recessed diameter portion 208 at the top and threads 210 on top Outer surface of the mandrel 206 at the end of this area 208. At the Inside of nipple 204 is a protruding surface 212 with threads 214 for engaging threads 210 on the

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Mandrel 206 provided.

If the nipple 204 is turned to the right, advised threads 210 and 214 disengaged and surface 212 is received by area 208 when a seal assembly 220 is lowered into a sealing position, as shown in FIG. The nipple 204 is moved downwards until it is frustoconical Shoulder 216, which is provided below the thread 214, with a frustoconical shoulder 218 the outside of the mandrel 206 at the lower end of the area 208 engages approximately as shown in FIG. Intervention is not permitted because friction occurs when the nipple 204 is rotated that would hinder the seating of the seal assembly 220. The seal assembly 220 and packing elements 228 can be suspended in a sealing position without the latch connection 202 engaging.

In connection with FIG. 9 it should be noted that the bolt connection 202 comprises an expandable bolt 222 which is in an annular recess 224, which is formed in the outer surface of the mandrel 206 immediately below the area 208. An adjusting screw 207, with which the bolt 222 is reset, extends through the nipple 204 around a retractable harness 203 to be able to disassemble after it has been pulled out of the wellbore. The lower outer edge 223 of the Latch 222 has toothed segments 225 that provide additional friction

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care for. The upper inner edge 227 of the latch 222 is for engagement with a corresponding upper control surface 229 in FIG the recess 224 beveled.

An annular groove is formed in the inner surface of the nipple 204 and is adjacent to the recess 224 when the sealing position is assumed, so that the bolt 222 expands into the annular groove 226. At its upper end has the Recess 224 has a region 231 which is less deep, which after the sealing arrangement 220 has been fitted and fastened a suspension element 230 is broken off by rotating a working pipe string 221, a shear pin 232 is broken off by lifting the nipple 204 so that the nipple 204 is separated from the seal assembly. The expanding latch 222 then expands automatically into the annular groove 226. The beveled edge of the latch 222 can interfere with the control surface 229 in Engage to force the latch 222 into the area 231 of shallower depth, like Pig. IO shows.

The friction between the inner surface of the annular groove 226, the latch 222 and the inner surface of the recess 224 allows the transmission of a torque from the nipple 204 to the mandrel 206. This breaks when the nipple 204 is rotated a shear pin 234, and the mandrel 206 is due to a left-handed Screw thread connection 236 unscrewed from suspension element 230. This is in Flg. 11 shown.

Instead of the bolt connection acting with friction 309886/0500

and of the bayonet catch 66 shown for the first and second exemplary embodiments, a screw thread connection could also be provided; but it is evident that that would be less beneficial.

Pig. 12 shows a multiple installation of the invention Apparatus in which a pipe head 300 supports a suspension element 302 on which a drill pipe 304 is suspended 1st. In addition, a seal assembly 306 is supported in this embodiment. There is also a latch 308 shown compressing a packing element 310, which is thereby in sealing engagement with the pipe head 300 and the suspension element 302.

A second drill string 320 is suspended from a second hanger 322, which is from the connector 312 of the seal assembly 306 is supported. Bs can any number of consecutive drill rods can be built.

The invention also relates to a device for carrying out the method according to the invention for installing and sealing a Pipe suspension element In a bore with a sealing arrangement 38} 220; 306, a lowering or Einfahrelnriohtung 36;., 203 with a first part 60; 204, which is connected to a second part 70; 206 is releasably connected and a first connecting device for hanging the pipe suspension element 32; 230 has while the second part 70; 206 a second connector for hanging the seal assembly 38; 220

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has, and by means 66; 200, 202 for releasing the first part from the second part in order to lower the sealing arrangement into the sealing position, the sealing arrangement, before lowering into the sealing position, from the pipe suspension element 32; 230; 302, 322 is free, are provided.

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Claims (26)

Expectations 1. A method for installing a pipe suspension element, characterized in that a sealing arrangement (38; 220; 306) on a first part (60; 204) of a retraction device (36; 203) and a pipe suspension element (32; 230) is attached to a second part (70; 206) of the retraction device hanging that the sealing arrangement and the Pipe suspension element on the retraction device into the borehole will,/ lowered / that the pipe suspension element is placed on the previously installed pipe head (24) that the first part of the Retracting device is rotated for separating the second part of the same, that the first part and the sealing arrangement continue is lowered into the borehole, .. that the first part is rotated to set the sealing arrangement within the borehole that the first part is raised to separate the first part from the sealing arrangement, and that the first part rotated to engage the second part of the retractor and separate the second part from the pipe hanger will. 2, method according to claim 1, characterized in that the first part (60; 204 ·) of the retraction device always rotated in the same direction. 309886/0500 3. Apparatus for carrying out the method according to claim 1 or 2 for installing and sealing a pipe suspension element in a bore, ge marked by a Sealing arrangement (38; 220; 306) any lowering or retracting device (36; 203) with a first part (60; 204) which is releasably connected to a second part (70; 206) and a first connecting device for hanging the sealing arrangement (38; 220), while the second part (70j 206) second connecting means for hanging the pipe hanger (32; 230) and by means (66; 200, 202) to detach the first part from the second part for lowering the sealing arrangement in the sealing position, the sealing arrangement before lowering into the sealing position Position of the pipe suspension element (32; 230; 302, 322) is free. 4. Apparatus according to claim 3, characterized by a device (78, 94). which provide a continuous seal creates between the first and the second part. 5. Apparatus according to claim 3 or 4, characterized by means for re-establishing engagement between the first and the second part. 6. Apparatus according to claim 5, characterized in that the engagement device comprises a bolt (202) which is caused by friction between the first and second. Part wedged, 309886/0500 7. The device according to claim 3, characterized in that the release device (66) connects the first part and the second part when rotating the first part by less than 360 ° ^ and that the second connecting device (85) connects the second part when rotating the second Part of the pipe suspension element (32) separates. 8. The device according to claim 3, characterized in that the release device (66) releases the first part from the second part when the first part is rotated by less than 360 °. 9. Apparatus according to claim 7 or 8, characterized in that the release device (66) has a bayonet lock, in which the toothed segments (7 ^ ·) in the upper region of the inside of the first part (60) with toothed segments (68) on the outside of the second part (70) cooperate. 10. The device according to claim 3 in use in a pipe head with a stop device, characterized in that the sealing arrangement (38) is a locking device (162) which can be brought into engagement with the stop device (186) when the first part is rotated. 11. The device according to claim 10, characterized in that the sealing arrangement (38; 220; 306) 309886/0500 has a tubular member which is connected to a retaining member is rotatably connected, and that the * locking device has a bolt (162) which is controlled by an actuating member (164) is supported, which is movable back and forth on the holding member in a manner to prevent mutual rotational movement is attached and screw-threadedly engaged with the tubular member such that the actuator, when rotated of the tubular member is axially movable on the holding member and the bolt (162) with the stop device (186) in Intervention is urgent. 12. The device according to claim 11, characterized in that the holding member is a packing element (150, 151 »228), which is compressible against a part of the pipe suspension element (32; 230) so that it is with the pipe head (24) and with the pipe suspension element under the engagement of the bolt (162) with the stop device (186) force exerted by the tubular member on the retaining member enters sealing engagement. 13. The apparatus according to claim 12, characterized in that the holding member has an upper ring and has a lower ring, that the packing element is arranged between the rings, and that the packing element is radial on the inside in sealing engagement with the outside of the pipe suspension element (32; 230) and radially on the outside in sealing engagement with the interior of the pipe head (24) 309886/050 0 . - 52 - is compressible. 14. The apparatus according to claim 12, characterized in that the tubular member with the first Part (60j 204) connected by the first connecting device and that the sealing arrangement includes means for preventing rotational movement of the retaining member prevents rotational movement when the seal assembly is in the sealing position and which causes itself when rotating the first part, the tubular member rotates and the retaining member remains stationary. 15. The device according to claim 14, characterized in that the rotary movement preventing device a coupling connection between the holding member and part of a correspondingly designed pipe suspension element (32). 16. The device according to claim 15, characterized in that the coupling connection is prestressed Thumb (176) which is mounted in the holding member such that it can move back and forth and in the sealing position in corresponding recesses (183) in said part of the Pipe suspension elements (32) can be used so that a rotary movement of the holding member is prevented while the sealing position is assumed. 17. Device, in particular according to one of the claims 2 to 16, for retracting a pipe suspension element 309886/0500 and a sealing arrangement in a single lowering process, characterized by a J-Schlltz connection between the retraction device or a protective sleeve and the seal. 18. Apparatus according to claim 17, characterized by parts which can be brought into engagement with the sealing arrangement or with the pipe suspension element and on which Devices are provided that allow a relative longitudinal and rotary movement in a certain position and at a other particular position prevent relative longitudinal or bi-directional rotational movement. 19. The device according to claim 18, characterized in that g e k a η η draws that the devices have a bayonet lock. 20. The device according to claim I7, marked t by a contractible hold-down rule direction on the sealing arrangement, which for Ii led get η of the sealing arrangement 'and the pipe suspension element3 radially is extensible on the outside. 21. The device according to claim 18, characterized in that the devices allow a Beweeung from the other position in the first position by a relative rotational movement by less than 36Ο ⁰ , which is followed by a relative longitudinal movement. 309886/0500 22. The device according to claim 21, characterized in that g e k e η η z'eichnet that the relative rotation is directed to the right, and that a left-handed screw thread connection between the Retraction device and the pipe suspension element is provided. 23. Device, in particular according to one of the claims 2 to 22, for retracting a pipe suspension element and a sealing arrangement in a single lowering process, characterized by a retractable hold-down latch means on the seal assembly which is radially outwardly expandable to hold down the seal assembly and the pipe suspension element. 24. The device according to claim 23, characterized in that a locking device on the sealing arrangement Is provided, which can be actuated when the retraction device is turned so that it moves the bolt radially expands outside. 25. The device according to claim 24, characterized in that the sealing arrangement for creating a seal is compressible in the longitudinal direction and that a device is provided which can be actuated so that they the sealing arrangement when rotating the retractor to expand the bolt radially outward in the longitudinal direction compresses. 26. Device, in particular according to one of the claims 2 to 25, characterized by a pipe suspension element with a device for supporting 309886/0500 a linkage arranged below and a device for engaging an externally disposed wellhead for supporting the tubular hanger on the wellhead, a Retractor extending upward from the pipe suspension element, a device on the retractor and the Pipe suspension element for releasably supporting the pipe suspension element on the retraction device, a compressible one Sealing arrangement surrounding part of the retractor and means on the retractor and the sealing arrangement which releasably supports the sealing arrangement on the retraction device and a J-slot connection has, due to the retraction device and the sealing arrangement releasable when the retraction device is rotated by less than a full rotation and for supporting the sealing arrangement can be re-engaged by the retraction device, the retraction device being a releasable connection between the support means for the pipe suspension element and the support means for the sealing arrangement has, which allows a movement of the seal assembly in the longitudinal direction relative to the pipe suspension element when the Connection is resolved. 309886/0500