Monitoring system for a pipe assembly, pipe assembly and method for monitoring mechanical stresses in a pipe assembly

Abstract

Monitoring system (1) for a pipe assembly (2) which extends partially into a borehole and has a bottom flange (20) at an end (2-1) projecting from the borehole, characterized by a support device (10) for supporting the bottom flange (20) against a soil-fixed structure (3), wherein the support device comprises at least one sensor device (100) by means of which a change in at least one support force (K1, K2) acting between the bottom flange (20) and the soil-fixed structure (3) by means of the support device (10) is detected.

Description

[0001] The invention relates to a monitoring system for a pipe assembly according to the preamble of claim 1, a pipe assembly for a borehole according to the preamble of claim 13 and a method for monitoring mechanical stresses in a pipe assembly according to the preamble of claim 15.

[0002] Such a monitoring system is designed for a pipe array that extends partially into a borehole and has a bottom flange at one end protruding from the borehole. For example, the pipe array can be used in an underground storage facility for natural gas or other industrial gases, or for liquids such as crude oil. The pipe array can then be used to establish a connection through the borehole between the surface and an underground cavity or formation for receiving the gas or liquid.

[0003] Such a casing arrangement often includes an anchor casing that extends partially into the borehole and protrudes from the borehole at one end. For example, the anchor casing end may protrude from the bottom of a well house containing a wellhead assembly. As part of such a wellhead assembly, a casing hanger flange may be attached to the bottom flange, sealing the casing arrangement at its surface end and providing connections for the controlled injection and / or extraction of gas or liquid into the casing arrangement. The injection and / or extraction of gas or liquid into or out of the cavity or formation may be carried out through at least one internal casing, in particular a production casing.The at least one inner pipe string can be attached to the bottom flange and extend at least partially into the borehole within the anchor pipe string.

[0004] The bottom flange can, for example, be located on the anchor pipe string in the area where the anchor pipe string protrudes from the borehole. Alternatively, the bottom flange is located on a service pipe string (also known as an intermediate pipe string). For example, the service pipe string can be located between the anchor pipe string and the bottom flange.

[0005] Such a pipe array is generally subject to variable mechanical stresses, which can act particularly on an anchor pipe array and / or on one or more inner pipe arrays. For example, displacements in the rock mass through which the borehole extends can cause changes in mechanical stress in the last cemented pipe array of the array. Furthermore, changes in ambient temperature or temperature changes caused by the injection or extraction of gas or liquid can cause changes in mechanical stress within the pipe array.

[0006] An inner pipe run serving as a conveying pipe run is often designed from the outset to be under elastic tensile stress to compensate for stress changes due to external influences. This tensile stress also acts on the base flange to which the inner pipe run is attached. A defect, for example, resulting from corrosion or a faulty weld, can cause a section of the conveying pipe run or another inner pipe run to break. Such a break in a section of an inner pipe run can also cause a change in the mechanical stress within the pipe run assembly.

[0007] It is known to monitor mechanical stress changes on an anchor tube assembly using strain gauges mounted on it. However, there is a need to further increase the reliability of stress change monitoring, particularly on one or more inner tube assemblies of a tube assembly.

[0008] The invention is based on the problem of creating a monitoring system for a pipe assembly that reliably detects changes in mechanical stress in the pipe assembly.

[0009] This problem is solved by a monitoring system having the features of claim 1.

[0010] The monitoring system then includes a support device for bracing the base flange against a ground-fixed structure. The support device includes at least one sensor device by means of which a change in at least one support force acting between the base flange and the ground-fixed structure via the support device is detected.

[0011] According to one embodiment, the monitoring system is provided for monitoring mechanical stresses in a pipe assembly, which comprises at least one inner pipe assembly. This inner pipe assembly is attached to the bottom flange and extends at least partially into the borehole. The at least one sensor device can be arranged and configured to detect a change in mechanical stress in the inner pipe assembly, which is transmitted to the bottom flange, as a change in the support force. The inner pipe assembly can, for example, be a production pipe assembly suspended in the bottom flange.

[0012] Advantageously, the support device comprises at least one clamping device for generating a mechanical preload on the base flange. In particular, the mechanical preload can be a compressive stress exerted by the support device on the one hand on the ground-fixed structure and on the other hand on the base flange. By means of such a defined preload, the reliability and accuracy of the monitoring device can be further increased. In particular, the at least one clamping device for generating the mechanical preload can comprise at least one hydraulic cylinder.

[0013] In a preferred embodiment, the at least one sensor device comprises at least one load cell and / or at least one pressure sensor for detecting the change in the at least one support force. Forces and force changes can be reliably detected in a manner known per se by means of a load cell, which, for example, comprises a spring element and a strain gauge. Additionally or alternatively, a force change, which may correspond to a stress change in the pipe assembly, can be detected, for example, by means of a pressure sensor on a hydraulic cylinder that serves as a clamping device.

[0014] The monitoring system can be provided, in particular, for a pipe assembly comprising an anchor pipe assembly with an anchor pipe assembly end protruding from the borehole, wherein the bottom flange is attached to the anchor pipe assembly end or to a technical pipe assembly. The support device preferably comprises at least one system section designed to be arranged on the anchor pipe assembly or the technical pipe assembly in the region of the anchor pipe assembly end or an end of the technical pipe assembly, thereby coming into contact with the bottom flange.

[0015] In one variant, the system section is designed to at least partially enclose the anchor tube assembly or the technical pipe assembly radially. For example, the system section can comprise several segments shaped to conform to an outer wall of the anchor tube assembly or the technical pipe assembly, each radially enclosing the anchor tube assembly or the technical pipe assembly over a specific angular range. The segments forming the system section can, for example, completely enclose the anchor tube assembly or the technical pipe assembly radially. For instance, the system section can comprise three segments shaped to radially enclose the anchor tube assembly or the technical pipe assembly over a 120° angular range.

[0016] In one embodiment, the monitoring system comprises at least two, and in particular three, spatially spaced support elements for bracing and / or pre-tensioning the base flange against the ground-fixed structure. The at least two support elements can, for example, be arranged at at least two attachment points on the system section and at least two support points on the ground-fixed structure. For example, three attachment points and three support points can be provided on the system section and the ground-fixed structure, respectively, offset from each other by 120°. It is conceivable, for example, that each support element comprises a side arm arranged on the system section and extending radially outwards. Each support element can further comprise a threaded rod, the threaded rod being attachable to a thread formed on the side arm.In particular, the threaded rod, which is held in a threaded bushing of the support element, enables continuous height adjustment of the support element.

[0017] The at least one sensor device can be arranged, in particular, on at least one support element. For example, a load cell can be arranged between a threaded rod of the at least one support element and a bearing block provided on the ground-fixed structure, and can be operatively connected to the threaded rod on one side and the bearing block on the other. Additionally, a clamping device, e.g., a hydraulic cylinder, can be arranged, at least partially, in the bearing block and may interact with the threaded rod via the load cell.

[0018] It is within the scope of the invention that the monitoring system can include an evaluation unit configured to determine whether a change in a support force detected by the at least one sensor exceeds a limit value and to provide an error signal if the change in the support force exceeds the limit value. The evaluation unit can, in particular, comprise an electronic evaluation unit with evaluation logic connected to the sensor unit. The error signal provided by the evaluation unit can, for example, be output to an alarm device, such as a signal light, and activate it.

[0019] According to one embodiment, the monitoring system according to the invention can include at least one temperature measuring device for detecting an ambient temperature. The temperature measuring device can be used to detect and, if necessary, compensate for the effects of an ambient temperature. For example, an ambient temperature determined by the temperature measuring device can be taken into account when setting a limit value for a detected change in a support force, the exceeding of which triggers an evaluation unit to generate an error signal. This can, for example, prevent voltage changes in the pipe assembly caused by fluctuations in the ambient temperature from triggering a false alarm.

[0020] In one embodiment, a distance sensor is arranged on a section of the support device to determine the distance between the at least one section of the support device and at least one section of the ground-fixed structure. The at least one distance sensor can be used, for example, for calibration during initial or subsequent installation of the monitoring system.

[0021] As part of the monitoring system, at least one strain gauge can additionally be provided, which can be arranged in a manner known per se to detect a change in mechanical stress on the anchor tube assembly. A change in a support force detected by the at least one sensor device can, for example, be evaluated by an evaluation unit in comparison with a change in mechanical stress on the anchor tube assembly detected by a strain gauge.

[0022] In a preferred embodiment, alternatively or additionally to a strain gauge arranged on the anchor tube assembly, one or more strain gauges are also provided on the conveying installation. For example, at least one strain gauge can be arranged on a tubing hanger or on a casing hanger.

[0023] A second aspect of the invention relates to a pipe assembly for a borehole, comprising an anchor pipe assembly, wherein the anchor pipe assembly extends partially into the borehole and has an anchor pipe assembly end that projects out of the borehole. The pipe assembly further comprises a bottom flange attached to the anchor pipe assembly end or to a technical pipe assembly, and at least one inner pipe assembly attached to the bottom flange and extending at least partially within the anchor pipe assembly into the borehole. The pipe assembly also includes a monitoring system comprising a support device for bracing the bottom flange against a ground-fixed structure, with at least one sensor device, wherein a change in at least one support force acting between the bottom flange and the ground-fixed structure by means of the support device can be detected by means of the sensor device.

[0024] A third aspect of the invention relates to a method for monitoring mechanical stresses in a pipe assembly that extends partially into a borehole and has a bottom flange at one end projecting from the borehole. A support device is provided that braces the bottom flange against a soil-fixed structure. A change in at least one support force is detected by means of at least one sensor device provided on the support device, wherein the at least one support force acts between the bottom flange and the soil-fixed structure via the support device. Furthermore, an evaluation unit determines whether the change in the support force exceeds a limit value, and an error signal is provided if the change in the support force exceeds the limit value.

[0025] Preferably, a mechanical preload is generated on the base flange by means of a clamping device provided on the support device.

[0026] Further details and advantages of the invention will become clear in the following description of exemplary embodiments with reference to the figures.

[0027] They show:

[0028] Fig. 1. A perspective view of a borehole head assembly with a monitoring system for monitoring mechanical stresses in a pipe assembly;

[0029] Fig. 2 an enlarged perspective view of the monitoring system from Fig. 1;

[0030] Fig. 3A– Fig. 3G a series of steps in the assembly of the monitoring system on the pipework arrangement;

[0031] Fig. 4A– Fig. 4B Perspective views of a borehole head arrangement with a monitoring system according to a further embodiment;

[0032] Fig. 4C shows an enlarged side view of the monitoring system. Fig. 4A– Fig. 4B;

[0033] Fig. 4D– Fig. 4E enlarged sectional views of the monitoring system from Fig. 4C;

[0034] Fig. 5A– Fig. 5E further enlarged views of parts of the monitoring system from Fig. 4A– Fig. 4C;

[0035] Fig. 6. A perspective view of a monitoring system according to a further implementation variant; and

[0036] Fig. 7A– Fig. 7B Perspective views of a borehole head arrangement with a monitoring system according to a further embodiment.

[0037] The Fig. Figure 1 shows a perspective view of a borehole head arrangement4 with a monitoring system 1 for monitoring mechanical stresses in a pipe assembly 2 . Such a pipe tour arrangement 2 For example, it can be used in an underground storage facility for natural gas or other technical gases or liquids, such as crude oil, and establish a connection via a borehole from the surface to an underground cavity or formation for receiving the gas or liquid. Fig. 1 is simply a section of the pipe assembly protruding from the borehole 2 depicted.

[0038] The pipework arrangement 2 includes an anchor tube tour 21 , which with an anchor tube tour end 21-1 The anchor pipe extends from the borehole. 21 through an opening in a drilling cellar floor 30 through it.

[0039] At the end of the anchor tube tour21-1 is a floor flange 20 fastened. In other embodiments, the base flange can be 20 be attached to a technical pipe assembly (not shown). The technical pipe assembly can, for example, be located between the anchor pipe assembly end 21-1 and the bottom flange 20 be arranged.

[0040] The bottom flange 20 serves to secure at least one inner tube loop (not shown) of the tube loop arrangement 2 , which are located within the anchor tube tour 21 extending into the borehole. An inner pipe string can be, in particular, a production pipe string for injecting and / or withdrawing the gas or liquid. The at least one inner pipe string can, for example, be located on the inside of the bottom flange. 20 be hooked up.

[0041] An inner pipe loop serving as a conveying pipe loop can be subject to an elastic tensile stress in the pipe loop arrangement from the outset. 2 It must be arranged to compensate for mechanical stress changes due to external influences within a certain range. With a proper arrangement of the conveying pipe assembly within the pipe assembly, the conveying pipe assembly can support the bottom flange. 20 for example, by applying a tensile stress.

[0042] At the in Fig. The embodiment shown in 1 comprises the borehole head arrangement. 5 additionally a casing hanger flange 24 , which is on the bottom flange 20 is attached and the pipework arrangement 2 seals. The casing hanger flange includes 24 several outlet openings 241with valves for the controlled injection and extraction of a gas or liquid into or from the underground cavity or formation by means of the pipe arrangement 2 .

[0043] In principle, with such a pipe layout, 2 A defect can lead to the breakage of a section of the conveying pipe or another internal pipe section. Such a breakage of a section of an internal pipe section generally causes a change in mechanical stress within the pipe assembly. 2 .

[0044] To monitor such mechanical stress changes in the pipe assembly 2 is in the borehole head arrangement 5 a monitoring system 1 provided for, which in Fig. 2 is shown in an enlarged perspective view.

[0045] The monitoring system 1 includes a support device 10for supporting the bottom flange 20 against a basic framework 3 The basic framework 3 is with a drilling cellar floor 30 firmly attached or essentially stationary on the drilling cellar floor due to its own weight 30 up, so that the basic frame 3 a ground-solid structure 3 represents.

[0046] The support device 10 The present one comprises three, each offset by 120° from each other around the anchor tube tour. 21 surrounding support elements 104 , whereby in the perspective views of the Fig. 1 and Fig. 2 only two of the three support elements each 104 are visible.

[0047] Each of the support elements 104 includes a side arm 104-1 , which is located at a section of the plant 103 the support device 10 is fastened and regarding the anchor tube tour 21 extends radially outwards.

[0048] The plant section 103 is thus in the area of ​​the anchor tube tour end 21-1 on the anchor tube tour 21 arranged so that it is connected to a lower section of the bottom flange 20 It is a supporting element in the plant. The plant section encompasses 103 the anchor tube tour 21 radial. The plant section 103 comprises three segments 103-1 , 103-2 , 103-3 , which are attached to an outer wall of the anchor tube tour 2 snuggle up and the anchor tube tour 2 Each section of the system encloses radially over an angle of 120°. In total, the system section encloses 103 the anchor tube tour 2 thus fully. In the Fig. 1 and Fig. Due to the perspective representation, there are only two segments. 103-1 , 103-2 visible, with the third segment 103-3 behind the anchor tube tour 2 is arranged.

[0049] The side arms 104-1 the support elements 104 Each has a threaded bushing at its radial end. 104-2 on, which are axially parallel to the anchor tube tour 21 extends. Each of the threaded bushings 104-2 serves to hold a threaded rod 104-3 for adjusting the height of the system section 103 .

[0050] Each of the threaded rods 104-3 It rests centrally on a load cell at the bottom. 100-1 off. The force sensor is supported in this process. 100-1 in turn, on a hydraulic cylinder 102-1 off, which is partially in each one attached to the basic frame 3 arranged bearing block 31 is recorded. The hydraulic cylinders 102-1 Each has a pressure sensor 100-2 up. The force transducer 100-1 and the pressure sensor 100-2 are in a protective housing 100-3 recorded, which is in the Fig. 1 and Fig. 2 is shown transparently for better clarity.

[0051] When the monitoring system is used as intended 1 The hydraulic cylinders serve as 102-1 as a clamping device 102 to create a preload on the bottom flange 20 , whereby the prestress is applied via the support elements 104 and the plant section 103 is exerted on the base flange. In particular, the hydraulic cylinders can be used to apply force. 102-1 a defined compressive stress is generated, which is supplied by the support device 10 on the one hand, on the ground-mounted base frame 3 and on the other hand, on the bottom flange 20 is exercised.

[0052] The force transducer 100-1 and / or the pressure sensors 100-2 They serve as sensor devices 100 for recording support forces K1, K2 and / or changes in support forces K1, K2, which are effected by means of the support device 10between the bottom flange 20 on the one hand, and the ground-mounted base frame 3 On the other hand, they have an effect. The pressure sensors 100-2 Changes in support forces K1 and K2 can be detected as corresponding pressure changes in the hydraulic cylinder. This is achieved using the sensor devices. 100 , 100-1 , 100-2 A change in mechanical stress in an inner pipe loop, acting on the bottom flange, can 20 is transferred, as changes in the support forces K1, K2 are recorded.

[0053] For example, if a section of the pipeline breaks, a [missing word] can occur on the bottom flange. 20 The applied tensile stress is suddenly reduced to such an extent that the sensor devices 100 The recorded support forces K1 and K2 also decrease. It is also conceivable that mechanical stresses in the pipe assembly occur as a result of displacements in the rock mass through which the borehole extends. 2change. For example, a final cemented pipe loop can alter the pipe loop arrangement. 2 Shifts in the mountain range cause tensile or compressive stress, which is partially transferred to the base flange. 20 , to which the last cemented pipe section is attached, is transferred. Such a stress redistribution of a pipe section onto the base flange. 20 can be achieved using the sensor devices 100 , 100-1 , 100-2 changes in the support forces K1, K2 are recorded.

[0054] The monitoring system 1 may include an electronic evaluation unit (not shown) that is connected to the sensor devices 100 , 100-1 , 100-2 is connected. The electronic evaluation unit can be equipped with evaluation logic to determine whether one of the sensor devices is connected. 100 , 100-1 , 100-2The evaluation unit generates an error signal if the detected change in at least one support force K1, K2 exceeds a limit value. This error signal can be sent to an alarm device, such as a signal light, and trigger its activation. Alternatively, the error signal provided by the evaluation unit can be processed in another way. For example, the error signal could activate an emergency stop function of a device, such as a pump connected to the pipework system. 2 interacts and can be triggered.

[0055] In the Fig. 1 and Fig. In the embodiment shown in 2, the monitoring system 1 a temperature measuring device 12 on, which is located at the plant section 103 is arranged. The temperature measuring device 12It can be used to detect and, if necessary, compensate for the effects of ambient temperature. For example, a temperature measuring device can be used to... 12 The measured ambient temperature is taken into account by the evaluation unit when setting a limit value, above which an error signal is provided. This prevents, for example, voltage changes in the pipework arrangement. 2 Fluctuations in ambient temperature can trigger a false alarm regarding a supposed break in a section of an internal pipe loop. When setting the limit value, defined mechanical prestresses on the bottom flange are also preferably considered. 20 , which are powered by the hydraulic cylinders 102-1 generated, taken into account.

[0056] On a side arm 104-1 a support element 104 is an optical rangefinder 13to determine a distance between the side arms 104-1 and the castle cellar floor 30 arranged. Such a rangefinder 13 can alternatively or additionally be attached to the other side arms 104-1 or on other sections of the support device 10 be arranged. The rangefinder 13 This can happen, for example, during the initial or subsequent installation of the monitoring system. 1 at the pipe arrangement 2 for calibrating the monitoring system 1 be used.

[0057] In Fig. 3A to Fig. 3G represents a series of steps in the installation of the surveillance system. 1 at the pipe arrangement 2 depicted. It becomes clear that the monitoring system 1 on an already fully installed pipe layout 2 can be arranged.

[0058] As in Fig. As shown in 3A, the individual segments are first shown. 103-1 , 103-2 , 103-3 of the plant section 103 on the drilling cellar floor 30 to the anchor tube tour 2 scheduled. In the Fig. The condition shown in 3A is the anchor tube tour 2 already from two segments 103-1 , 103-3 radially enclosed over an angular range of 240°.

[0059] Fig. 3B shows a third segment 103-2 , which is additionally on the anchor tube tour 2 is arranged so that the three segments 103-1 , 103-2 , 103-3 their side edges lie flush against each other and the anchor tube tour 2 completely enclose the segments radially. 103-1 , 103-2 , 103-3 are connected by means of three connecting elements 103-4 connected to each other. For this purpose, the connecting elements are used. 103-4inserted into grooves located on the side edges of the segments 103-1 , 103-2 , 103-3 are trained and parallel to the anchor tube tour 2 extend.

[0060] In a further step, the side arms 104-1 the support elements 104 on the segments 103-1 , 103-2 , 103-3 screwed down, as in Fig. 3C shown.

[0061] The plant section 103 with the attached side arms 104-1 will be along the anchor tube tour 21 upwards to the area of ​​the anchor tube tour end 21-1 moved and temporarily fixed there (see below). Fig. 3D). This includes the plant section. 103 not yet connected to the bottom flange 20 in the appendix.

[0062] The threaded rods 104-3 are inserted into the side arms 104-1 arranged threaded bushings 104-2 screwed in (see Fig. 3E). The basic framework 3 , which has a circular basic shape, is placed on the drilling cellar floor in this manner 30 fastened so that the bearing blocks 31 each with the associated threaded rods 104-3 cursed. In Fig. 3E is only a basic frame segment 32 shown, with the basic frame 3 a total of three such basic frame segments 32 It includes a multitude of threaded bolts on the underside of each base frame segment to compensate for any unevenness in the drilling basement floor. 30 planned.

[0063] In the Fig. In the state shown in 3F, all basic frame segments are already present. 32 on the drilling cellar floor 30 arranged. Furthermore, each bearing block is 31 Each one hydraulic cylinder 102-1 introduced, each with a threaded rod 104-3 aligns. Between each hydraulic cylinder 102-1and a lower end of the respective associated threaded rod 104-3 Each load cell will be used. 100-1 arranged so that the lower end of the threaded rod 104-3 acts centrally on the load cell (see Fig. 3G).

[0064] By actuating the hydraulic cylinders 102-1 can the plant element 103 lifted and connected to the base flange 20 be installed. The hydraulic cylinder can be used in this process. 102-1 a compressive stress on the support elements 4 exercise which affect the plant section 103 and is transmitted from there to the base flange. This corresponds to an intended operating state of the monitoring device, which is described in the Fig. 1 and Fig. 2 is shown.

[0065] The Fig. 4A– Fig. Figure 4B shows perspective views of a borehole head arrangement. 4 with a monitoring system 1According to a further embodiment. In this embodiment, the support forces K1, K2 and K3 (hidden in the illustration) are directly transmitted from the threaded rods. 104-3 the support elements 104 into a load cell located below each one 100-1 and from there into the solid ground structure 3 In contrast to the above with regard to the Fig. 1 to Fig. The embodiment described in 3G is therefore not a hydraulic cylinder 102-1 between the respective threaded rod 104-3 or the load cell 100-1 on the one hand and the basic framework 3 On the other hand, it is provided for. Rather, separate hydraulic cylinders are used in each case. 102-1 between the side arms 104-1 the support elements 104 on the one hand and the basic framework 3 arranged on the other hand. This is also in Fig. 4C based on an enlarged side view of the monitoring system 1as well as an associated sectional view in Fig. 4D illustrated.

[0066] The hydraulic cylinders 102-1 They can, for example, be used as clamping devices as described above. 102 to create a mechanical preload on the base flange 20 can be used. However, it is also conceivable that the hydraulic cylinders 102-1 only for installation of the monitoring system, namely in particular for the setup and / or calibration or recalibration of the monitoring system. 1 be used.

[0067] In Fig. 4E is a section of the sectional view from Fig. Displayed in 4D magnification. Fig. 4E shows in particular a cross-section through the plant section 103 . Between an inner side of the plant section 103 and an outer wall of the anchor tube tour 21In this embodiment, several strain gauges (SGs) are applied in pairs. 14 Designed for detecting strain changes (from which stress changes can be calculated) along the anchor tube. The installation space is dimensioned to allow for chemical saturation of the strain gauge applications. 14 cannot be damaged. The strain gauges 14 They are therefore also protected against superficial mechanical damage. Additionally, another pair of strain gauges is applied in a corresponding manner to the opposite side (as shown in the sectional view). 14 arranged. For example, the two opposing pairs of strain gauges can form a full strain gauge bridge. Additional strain gauges, not shown in this sectional view, can also be used. 14 around the anchor tube tour 21be arranged. In a preferred embodiment, for example, a total of twelve strain gauges are arranged. 14 at equal intervals around the outer edge of the anchor tube tour 21 arranged in this way, for example, four opposite each other (i.e., offset by 180° around the circumference of the anchor tube loop) can be arranged. 21 (arranged) strain gauges 14 Form a DMS full bridge.

[0068] From the sectional view in Fig. 4E as well as from the Fig. 5A to Fig. 5E It is further evident that in the present embodiment the segments 103-1 , 103-2 , 103-3 of the plant section 103 using three plug-in fuses 103-5 , 103-6 are held together. Each plug-in fuse includes one in the Fig. 5D separately depicted plug-in locking element 103-5, which has the shape of a radially inwardly tapering ring section. In the assembled state of the system section 103 Each pair of adjacent segments forms a segment. 103-1 , 103-2 , 103-3 in an area where they laterally border each other, a correspondingly shaped recess is provided, into which a plug-in locking element is inserted. 103-5 It can be inserted radially. For securing the plug-in locking elements. 103-5 Each of the recesses contains a [missing information - likely a specific feature or element]. Fig. 5E enlarged view of retaining element 103-6 provided, which also has the shape of a ring cutout and which is connected on both sides to one of the adjacent segments. 103-1 , 103-2 , 103-3 as well as in the middle with the plug-in locking element 103-5 It can be screwed in place. For mounting the retaining element. 103-6 such that it does not extend radially across the circumference of the plant section 103 What stands out is that both in the segments103-1 , 103-2 , 103-3 as well as in the plug-in fuse elements 103-5 Appropriate exceptions are provided.

[0069] The Fig. Figure 6 shows a perspective view of a surveillance system. 1 according to a further advantageous embodiment. In this embodiment, the ground-mounted base frame features 3 an essentially triangular basic shape with rounded corners in the area of ​​the three supporting elements 104 Naturally, there are many other variations of the basic framework. 3 and, if applicable, the basic frame segments forming them 32 conceivable.

[0070] In the Fig. 7A and Fig. 7B are perspective views of a borehole head arrangement 4 with a monitoring system 1as illustrated in a further embodiment. In contrast to the embodiments described above, the axial support forces K1, K2 and K3 are not transferred into the drilling cellar floor. 30 , but are directed onto the walls of the drilling cellar or the drilling site. This is done by means of a base frame. 3 , preferably in the form of a steel frame 3 , which rests on the walls of the drilling cellar or on the drilling site. The base frame 3 For example, as in the Fig. Figure 7 illustrates that the frame rests on the walls of the drilling cellar with lateral support sections and is thus suspended in the drilling cellar. Such a base frame is also... 3 forms a ground-solid structure in accordance with the present invention. Reference symbol list 1 monitoring system 10 Support device 100 sensor devices 100-1 load cell 100-2 pressure sensor 100-3 Protective Housing 102 Clamping device 102-1 Hydraulic cylinder 103 Plant section 103-1, 103-2, 103-3 segments 103-4 Connecting element 103-5 Plug-in fuse element 103-6 Holding element 104 Support element 104-1 Side arm 104-2 Threaded bushing 104-3 threaded rod 12 Temperature measuring device 13 rangefinders 14 strain gauges 2 pipe tour arrangement 2-1 End 20 bottom flange 21 Anchor Tube Tour 21-1 Anchor tube tour end 24 Casing hanger flange 241 Outlet opening 3 Ground-resistant structure 30 Drilling cellar floor 31 Bearing block 32 Basic frame segment 4 Borehole head arrangement K1, K2 support forces

Claims

[1] Monitoring system ( 1 ) for a pipe tour arrangement ( 2 ), which extends partially into a borehole and protrudes from the borehole at one end ( 2-1 ) a bottom flange ( 20 ) has, characterized by a support device ( 10 ) to support the bottom flange ( 20 ) against a soil-resistant structure ( 3 ), wherein the support device includes at least one sensor device ( 100 ) includes, by means of which a change in at least one support force (K1, K2) is achieved by means of the support device ( 10 ) between the bottom flange ( 20 ) and the soil-solid structure ( 3 ) is effective, is detected. [2] Monitoring system ( 1 ) according to claim 1, characterized by that the at least one sensor device ( 100 ) is arranged and designed to prevent a change in mechanical stress in a component attached to the base flange ( 20) fixed inner pipe string extending at least partially into the borehole ( 22 ) the pipe tour arrangement ( 1 ), whereby the change in mechanical stress on the bottom flange ( 20 ) is transferred, to be recorded as a change in at least one support force (K1, K2). [3] Monitoring system ( 1 ) according to claim 1 or 2, characterized by that the support device ( 10 ) at least one clamping device ( 102 ) to generate a mechanical preload on the bottom flange ( 20 ) includes. [4] Monitoring system ( 1 ) according to claim 3, characterized by that the at least one clamping device ( 102 ) at least one hydraulic cylinder ( 102-1 ) includes. [5] Monitoring system ( 1 ) according to one of the preceding claims, characterized by that the at least one sensor device ( 100 ) at least one load cell ( 100-1) and / or at least one pressure sensor ( 100-2 ) includes. [6] Monitoring system ( 1 ) according to one of the preceding claims, characterized by that the support device ( 10 ) at least one plant section ( 103 ) includes, who is trained to participate in an anchor tube tour ( 21 ) or on a technical pipe tour of the pipe tour arrangement ( 2 ) in the area of ​​an anchor tube end protruding from the borehole ( 21-1 ) or one end of the technical pipe run and thereby connected to the anchor pipe run end ( 21-1 ) or the bottom flange attached to the end of the technical pipe run ( 20 ) to come to the facility. [7] Monitoring system ( 1 ) according to claim 6, characterized by that the plant section ( 103 ) is trained, the anchor tube tour ( 21 ) or to at least partially enclose the technical pipework radially. [8] Monitoring system (1 ) according to one of the preceding claims, characterized by that the support device ( 10 ) at least three spatially spaced support elements ( 104 ) for supporting and / or pre-tensioning the bottom flange ( 20 ) against the soil-solid structure ( 3 ) includes. [9] Monitoring system ( 1 ) according to one of the preceding claims, characterized by an evaluation unit configured to determine whether a sensor device ( 100 ) detected change in a support force (K1, K2) exceeds a limit value and provide an error signal when the change in the support force (K1, K2) exceeds the limit value. [10] Monitoring system ( 1 ) according to one of the preceding claims, characterized by at least one temperature measuring device ( 12 ) for measuring ambient temperature. [11] Monitoring system (1 ) according to one of the preceding claims, characterized by at least one on a section of the support device ( 10 ) arranged rangefinder ( 13 ) to determine a distance between at least one section of the support device ( 10 ) and at least one section of the soil-solid structure ( 3 ). [12] Monitoring system ( 1 ) according to one of the preceding claims, characterized by at least one strain gauge which is provided and designed to detect a change in a mechanical stress on an anchor tube loop ( 21 ) and / or on a conveying installation, in particular on a tubing hanger and / or on a casing hanger, the pipe assembly ( 2 ) to be ordered. [13] Pipe tour arrangement ( 2 ) for a borehole, with – an anchor tube tour ( 21), which extends partially into the borehole and includes an anchor tube tour end ( 21-1 ) that protrudes from the borehole, – one at the end of the anchor tube tour ( 21-1 ) or a ground flange attached to a technical pipe run ( 20 ) and – at least one internal pipe tour ( 22 ), which are attached to the bottom flange ( 20 ) is fastened and is located at least partially within the anchor tube tour ( 21 ) extends into the borehole, characterized by that the pipe layout ( 2 ) to detect a change in mechanical stress in at least one inner tube loop ( 22 ) a monitoring system ( 1 ) includes a support device ( 10 ) to support the bottom flange ( 20 ) against a soil-resistant structure ( 3 ) with at least one sensor device ( 100 ) has, wherein by means of the sensor device (100 ) a change in at least one support force (K1, K2) that is applied by means of the support device ( 10 ) between the bottom flange ( 20 ) and the soil-solid structure ( 3 ) is effective, perceptible. [14] Pipe tour arrangement ( 2 ) according to claim 13, characterized by that the ground-solid structure ( 3 ) includes at least one base frame which is supported on a drilling cellar floor and / or on at least one drilling cellar wall. [15] Method for monitoring mechanical stresses in a pipe assembly ( 2 ), which extends partially into a borehole and protrudes from the borehole at one end ( 2-1 ) a bottom flange ( 20 ) shows, characterized by that – a support device ( 10 ) is provided, which the bottom flange ( 20 ) against a soil-resistant structure ( 3 ) supports, – by means of at least one on the support device ( 10 ) provided sensor device ( 100 ) a change in at least one support force (K1, K2) is detected, whereby the at least one support force (K1, K2) is detected by means of the support device ( 10 ) between the bottom flange ( 20 ) and the soil-solid structure ( 3 ) works, – by means of an evaluation unit ( 11 ) is determined whether the change in support force (K1, K2) exceeds a limit value, and – an error signal is provided if the change in support force (K1, K2) exceeds the limit value. [16] Method according to claim 15, characterized by that by means of a support device ( 10 ) provided clamping device ( 102 ) a mechanical preload on the bottom flange ( 20 ) is generated.

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