MXPA97004642A - Non-coastal platform with supplementary support for fleet drilling tower - Google Patents

Abstract

The present invention relates to a non-coastal platform structure (10) for temporarily using a self-elevating drilling rig (34), for drilling operations in deep water applications, having a base (12) of rigid floating artifact, cemented in the background, which supports a surface tower (28) which extends above the surface of the ocean (30) and a supporting interconnection (110) of the subsea drilling tower, which is adapted to support the tower drill rig (34) for drilling operations. At least one emersion tank or air box (112) for the support of the floating drilling tower is selectively connected to the support interconnection of the derrick, whereby a portion of the temporary load on the base of the artifact. Rigid floating in the supporting operation of the self-elevating drilling rig for drilling operations, can be relieved or relieved

Description

PLATFORM. NO COASTAL WITH SUPPLEMENTARY SUPPORT FOR FLOATING DRILLING TOWER Field of the Invention The present invention relates to a platform and a system for conducting or carrying out offshore oil recovery operations. More particularly, the present invention relates to a platform structure and to a system for allowing the use of a self-elevating drilling rig in deep water.

Background of the Invention Self-elevating drill rigs provide a drill hole and associated equipment for drilling, finishing or working on a well. This equipment is mounted to a ship / deck which is capable of floating these facilities to a place or place. A plurality of retractable legs are provided, which make the self-elevating drilling rig conveniently portable. Once they have floated towards their position for conventional operations, the legs are introduced R * £ .025015 under pressure with a jack until they make contact with the sea floor. The additional compression by means of jacks, transfers the load from the floating vessel to the legs, then lifts the vessel / deck out of the water and above the splash zone to produce an offshore platform cemented at the bottom, stable, for carry out drilling or drilling operations. One consideration of this design is that to take better advantage of the mobile nature of the facilities provided on the self-elevating drilling tower, the drill tower is removed after the drilling is complete and does not remain deployed during the development phase. production except, possibly, for drilling operations and complementary, temporary works. Considerable investment in drilling, finishing and equipment for add-on jobs is best utilized by the redeployment of the self-elevating drilling rig to another location as soon as these operations are completed. Therefore, the surface terminations for production are not accommodated on the self-elevating drill rig itself. A small structure called a "rigid wellbore floating device" can be used with the self-elevating drill rig to provide the benefits of a surface finish with the convenience of a self-elevating drill rig. However, the combinations of rigid floating devices and self-elevating drilling rigs are limited to deployment in shallow waters. In addition, practical limitations on retractable leg lengths more directly restrict the depth at which jack-up towers can be traditionally deployed. The requirements to work deep in the deep waters have very often been solved by making continuous use of platform structures cemented in the bottom. The facilities on the deck provide access to the well suitable for production operations. However, such structures must devote a significant amount of their structural strength to support drilling facilities that are only required for a relatively short period of time in the duration of the total operations from the platform in the recovery of oil and gas to from a deposit. In addition, the structure must be able to withstand the maximum environmental design conditions, the design criteria against hurricanes, with these drilling facilities in place.

Of course, the recovery operations lead to the depletion of the hydrocarbon deposit and, over time, the platform loses its usefulness in one place. However, the rigid floating device for drilling or drilling, which forms the tower supporting the deck of the platform can be structurally stable and capable of a long life or long life. Nevertheless, salvage operations are difficult and another restriction of rigid floating devices for drilling is that they are designed specifically for a given depth of water. This tends to substantially limit the opportunities for redeployment. Some designs have been proposed for the deployment "on the slopes or on a platform structure" of a self-elevating derrick on an underwater structure, yet these designs have taken many of the limitations of each structure producing the result that, although the same increase the depth for the self-elevating floating tower, otherwise the sum of the limitations of its constituent parts remain. More recently, a new platform concept has been proposed, combining the benefits of self-elevating drilling rigs and traditional, bottom-set platform structures without transferring their disadvantages to the combination. Accordingly, the "Hyjack" platform has been proposed, which combines a small surface tower sufficient to support or support production operations with a base for the substantial rigid floating device, which supports the surface tower and temporarily supports a derrick forklift for drilling operations. Following the drilling, the self-elevating drill tower is removed and the small surface tower supports or supports the production operations. This is described in greater detail in U.S. Patent Application. No. 08 / 129,820, filed on September 30, 1993, by Dale M. Gallaher et al. For an Offshore Platform and System Structure. Additional features that facilitate salvage and redeployment, particularly in combination with the concept of the preceding platform, are described more fully in U.S. Patent Application. No. 08 / 129,829, filed on September 30, 1993, by George E. Sgouros et al. For a Rigid Floating Device for a Reusable Offshore Platform. The full description of each of these patent applications are incorporated herein by reference and form a part thereof.

The preceding rescue and redeployment provisions allow for a second use of piles or sleeves for piles without complicated, costly or dry dock offshore operations. However, the structure of the offshore platform remains rather limited to the depths to which it can be redeployed. This is because the cover is restricted both by the depth of the support interconnection of the subsea drilling platform and by the height of the tower from the surface on which the cantilevered beam roof requires the space to place the derrick drill. The first of these restrictions involves major structural components. But the second restriction is limited only due to the complexity of existing offshore operations and the cost and inconvenience of towing the platform structure offshore to the dry dock or carrying a dry dock floating thereto. When platforms are used in progressively deeper waters, their dynamic response may become a larger design consideration because traditional, bottom-set platforms become relatively less rigid-in response to wind, waves and the currents. However, the dynamic response becomes of central interest for adequate towers where flexibility is a key design precept. The proper towers are designed to "give" a controlled way of responding to dynamic environmental charges rather than resisting these forces almost rigidly. A basic requirement for the control of this response is to produce a structure that has harmonic frequencies or natural periods that avoid those found in nature. The total mass in the upper part with respect to the base of the rigid floating device is one that controls the variables in the definition of the natural periods of the structure. The adaptation of the concept of the hyjack platform to suitable towers represents a unique challenge because a platform must accommodate such widely different design states based on the presence or absence of the elevator derrick in time, in question. However, there is going to be a continuing need in some circumstances to economically accommodate and even improve the benefits of surface complements, and the convenience and economic characteristics of the deepwater derrick operations. According to the invention, an offshore platform structure is provided for temporarily using a self-elevating drill rig for drilling or drilling operations in deep-water applications, comprising: a base of rigid floating artifact cemented to the bottom, a tower of surface supported by the base of the rigid floating device and extending above the surface of the ocean, a deck of the platform supported by the surface tower, a supporting interconnection of the underwater derrick presented on the upper part of the base of the rigid floating device adapted to support the drilling rig for drilling operations, and at least one emersion tank or air box for the support of the drilling tower, connected to the supporting interconnection of the derrick. An advantage of the present invention is that it additionally minimizes the permanent structure that is dedicated to serve the limited need to support or support drilling operations on the productive life of a platform. Another advantage of some embodiments of the present invention is that they may give the opportunity to adapt a 'hyjack platform installed to accept a wider range of footprints or treads of the self-elevating drilling rig, where the drilling towers of the initial design They have proven that they are not available. The above brief description, as well as the additional objects and advantages of the present invention, will be more fully appreciated by reference to the following detailed description of the preferred embodiments which should be read in conjunction with the accompanying drawings, in which: which: Figure 1 is a side elevation view illustrating a non-coastal platform structure deployed; Figure 2 is a top elevation view of a continuous foundation plate of the derrick taken from line 2-2 in Figure 1; Figure 3 is a cross-sectional view of the structure of the non-coastal platform of Figure 1, taken on line 3-3 of Figure 1; Figure 4 is a top perspective view of a continuous foundation plate of the derrick as shown in Figure 1; Figure 5 is a bottom perspective view of the continuous foundation plate of the drill tower of Figure 4; Figure 6 is a side elevational view of an installation of the continuous foundation plate of the drill tower; Figure 7 is a side elevation view of a self-elevating drilling tower that is deployed on a non-coastal platform structure with a continuous foundation plate of the drill tower; Figure 8 is a partially cross-sectional view illustrative of one embodiment of a fixing connection of the continuous foundation plate taken along line 8-8 in Figure 9; Figure 9 is a side elevation view of a self-elevating drilling tower deployed on the structure of the offshore platform; Figure 10 is a side elevational view of a suitable tower embodiment of the present invention deploying a self-elevating drill tower; Figures 11A-11D are side elevation views of the salvage and redeployment of a non-coastal platform structure at a different depth of water; Figure 12A is a top elevation view of an alternative embodiment of an emersion tank or air box for supporting the drill tower; and Figure 12B is a side elevation view of the emersion tank or air box for the support of the drill tower of Figure 12A.

Detailed description of the invention In Figure 1, the emersion tank or air box 110 for the support of the derrick, in the shape of the continuous foundation plate 110A of the derrick, is provided to compensate the weight of the derrick jack 34 during deployment on the base 12 of the rigid floating device cemented to the bottom. In this illustration, the self-elevating drilling tower 34 is shown in its initial focus. The non-coastal platform structure 10 provides a supporting interconnection 26 of the subsea drilling tower on the upper part of the base 12 of the rigid bottom-cemented floating device, which has legs 14 and a frame 16 of the struts 18. The base of the rigid floating device is bolted to the ocean floor 24 with piles 22 which are fixed or secured to the base of the rigid floating device in a plurality of sleeves or ferrules 20 of the piles.

A tower of the surface 28 is supported by the base 12 of the rigid floating device to present a deck 32 of the platform, above the surface 30 of the ocean. The tower 28 of the surface is positioned to allow unobstructed access to the support interconnect 26 of the subsea drilling tower. A convenient way to provide this access for a three-legged self-elevating drill rig 34 is to place the surface tower in a corner of the self-elevating drill tower and provide the legs 14 of a rigid floating quadrangle-shaped fixture base. , substantially aligned with the discrete contact points such as the cubes or cells 38 of the initial chisel or auger, which generally correspond to the footprint or tread of the self-elevating drilling tower. The continuous foundation plate 110A of the derrick is illustrated in more detail in Figures 2, 4, 5 and 8. Figures 2 and 4 illustrate the upper part of the continuous foundation plate of the derrick which presents a submarine underwater support interconnection 138, on top of a tank element 112. The cubes or cells of the initial chisel or drill bit of the secondary underwater support interconnection 138, are arranged to receive the legs 36 of the derrick jack 34. The lower part of the tank element 112 has an interconnection 114 of the base of the rigid floating device (see Figure 5) which corresponds to the cubes or cells 38 of the chisel or initial auger of the support interconnection of the tower. of underwater drilling presented in the upper part of the base of the rigid floating device. See Figure 3. The continuous foundation plate 110A of the drill tower has a floating and selectively weighed tank element 112., with the interconnection 114 of the base of the rigid floating device on the lower surface (see Figure 5) and the supporting interconnection 39 of the subsea drilling tower on the upper surface (see Figure 4). The internal structural elements connect the interconnections 114 and 39 in a load-bearing relationship. More conveniently, the load is transferred vertically between the discrete aligned contact points. However, if necessary, it may be possible to manufacture a continuous foundation plate of the derrick with a suitable structural framework to distribute the load between the base of the rigid floating device and the self-elevating drilling tower in a different manner than in the vertical alignment 'direct. Accordingly, it may be possible to use the continuous foundation plate 110A of the derrick as an adapter to allow the use of a self-elevating drill tower having a different footprint or footprint, from which the design assumption was made. original when the base 12 of the rigid floating device was manufactured. The different footprints or footprints in the interconnection 114 of the base of the rigid floating device and in the support interconnection 39 of the secondary subsea drilling tower, are one of the characteristics illustrated in an alternative embodiment 110C of the continuous foundation plate of the drill tower illustrated in Figures 12A and 12B. Here, the discrete tank elements 112 are interconnected by external structural elements or by the frame 111. It may be desirable to manufacture compartments inside the elements of the tanks. These compartments can be connected with valves that will provide more control than just providing an air line, a valve at the bottom of the water to escape when the air is introduced, and a valve on the top so that the air is released when let the ballast be introduced from the bottom. By providing extra control by means of valves and compartments, versatility in response can be provided by using a mixture of compressible and non-compressible fluids to control flotation through a range of pressure conditions. This may limit the effective volume into which the gas is inserted when it expands, for example, during the platform lifting operations described below with Figures 11A-11D. Otherwise, the volume of gas in the tank element will increase when the tank element rises and the pressure is reduced. The expanded volume of the gas displaces more water, increasing the flotation of the platform, causing it to rise faster, etc. Figures 6-9 illustrate the installation of the continuous foundation plate 110A of the derrick and the deployment of the self-elevating drill tower 34. In Figure 6, the continuous foundation plate 110A of the derrick has been ballasted partially, filling it with enough water to make it less than neutrally floating. It is then lowered by the crane barge 116 to the upper part of the base 12 of the rigid floating device adjacent to the tower 28 of the surface, engaging or locking the interconnection of the base of the rigid floating device with the supporting interconnection of the blanket or carpet, carrying the legs 36A of the interconnection 114 of the base of the rigid floating artifact towards the cubes or cells 38 of the initial chisel or bit provided with a plurality of fixing connections 140 of the continuous foundation plate. Since these connections will be below the wave zone, but within the depth range for the self-elevating drill rigs, any number of positive control fastening devices, including a hydraulic control, is possible., operable by ROV, or even operated by a diver. Figure 8 illustrates one such fixing connection of the continuous foundation plate for securing the continuous foundation plate 110A of the derrick to the base 12 of the rigid floating device. Here, the interconnection 114 of the base of the rigid floating device has a centering pin 37 extending from a flanged leg 36A. The cubes or cells of the chisel or first auger are provided in the form of a lattice structure of steel 38D which can be covered with a rubber or other elastomeric cushion 38B. A spring-loaded grounding receptacle 38E extends upwardly from the center of the lattice structure. Here, this is illustrated with the springs 144, the cathodic protection for which it has been omitted for reasons of clarity. Other spring systems, such as those using elastomeric components or damping systems, may alternatively be used.

During installation, the centering pins 37 of the interconnection 114 of the base of the rigid floating device are guided towards the recess 146 in the ground fixing receptacle 38E, which is progressively loaded and centered when the spring is deflected and the leg 36A with flanges sits on the legs 34 of the lattice structure of the self-elevating drilling tower 34. The hydraulically driven clamping arms 41 are deployed to engage the edges of the leg 36A to secure or secure the continuous foundation plate the derrick to the base of the rigid floating device to improve stability when the continuous foundation plate of the derrick is floating and the self-elevating drill tower is in place. In Figure 7, the self-elevating drilling tower 34 has been floated on the hull 52 towards the tower of the surface 28 adjacent to the position and the legs 50 are being lowered towards the support interconnection 39 of the secondary drill tower presented in FIG. the upper surface of the tank member 112. The drill frame 56 is removed on the cantilevered beam deck 58 to enable this to close the maneuver. An air compressor or other source of high pressure gas is conveniently provided on the self-elevating drilling tower 34 and connected to the continuous foundation plate 110A of the drilling tower by means of the air line or line 118. The interior of the element tank 112 has ballast chambers into which air or other gas can be pumped to give flotation and a valve system 116 through which the gas can be pumped and the seawater displaced, released. The exchanges between the temporary loading to the base 12 of the rigid floating device, the temporary loading to the fixing connections 140 of the continuous foundation plate of the derrick, the design criteria and the failure scenarios will determine if the plate continues 110A of the derrick are floated before, during or after the self-elevating drilling tower 34. The additional pressure by means of jacks of the legs 50 brings the legs 36 in contact with the interconnection 39 of the subsea, secondary drilling tower, and it may be desirable to releasably secure the legs 36 of the self-elevating drilling rig to the interconnection by means of a rigging connection 120 of the drill rig (see Figure 9) identical in construction and operation to the fixing connection of the continuous foundation plate illustrated in Figure 8. The operation by means of additional jacks of the legs 50 raise the hull 52 out of the water and at the height of the desired platform. At this elevation, the cantilever beam cover 58 will clear the cover 32 of the tower platform from the surface 28 and the drill frame 56 can be brought into position to begin drilling operations through the conductors 40. After the drilling operations are completed, the self-elevating drilling tower 34 can be removed by essentially reversing the installation steps. The continuous foundation plate 110A of the drill tower can be weighted down to a substantially neutral float by selectively allowing sea water to be introduced and air to escape from the tank element 112. Unless it is useful to control the dynamic response as It is described later, the continuous foundation plate of the drill tower can then be removed with a crane barge. Figures 10 and 11A-11D illustrate another embodiment of the flotation tank 110 for supporting the derrick, here in the form of a plurality of elongated, vertically oriented cylindrical tank members 110B. The elongated tank elements are mounted to a plurality of levels of the frame 16 in the base 12 of the rigid floating device in vertical alignment with discrete contact points in the interconnection 38 of the subsea drilling tower. Figure 10 also illustrates a suitable tower mode. Although the dynamic response is a consideration for the platforms built in the background, traditional, that have rigid tower structures or fixed to deep water, the dynamic response becomes of a more central interest for adequate towers. The proper towers are designed to "give" a controlled way of responding to dynamic environmental charges rather than resisting these forces almost rigidly. A basic requirement to control this response is to produce a structure that has harmonic frequencies or natural periods that avoid those found in nature. Here, the base 12 of the rigid floating device has parallel legs 14 to improve its flexibility. For reasons of clarity, the intermediate regions of this base of the rigid, long floating artifact have been omitted from Figure 10. The total mass in the upper part up to the base of the rigid floating device is one of the control variables in the definition of the natural periods of the structure. Accordingly, the structure of the non-coastal platform 10, with the self-elevating drilling tower 34 in place, is a condition that must be accommodated. However, it can be difficult to design a non-coastal platform that has a suitably wide range to accommodate the mass of the derrick both when it is present and when it is absent. It can also be difficult to find two separate intervals that avoid the natural harmonic movements of the structure to accommodate the non-coastal platform in both drilling operations with the self-elevating drilling tower in place and in production operations with the self-elevating drilling rig removed. By using the ballast tank element 110 to take a ballast when the self-elevating drill tower is removed, the range of masses to be accommodated can be substantially narrowed. This can be conveniently provided by the same emersion tank or air chamber 110 for the support of the weighed drilling tower, which relieves the load of the weight of the self-elevating drill tower. Although a continuous foundation plate 110A of the derrick can be deployed, the continuous need for tank elements, both in the presence and in the absence of the self-elevating drilling tower, is accommodated here by vertically oriented tank elements 110B, cylindrical, elongated. If used to provide flotation support for decentering the weight of the self-elevating drilling rig 34 during drilling or other drilling operations, this flotation reserve can be replaced with seawater with the removal of the self-elevating drill rig, to substantially replace the mass of the self-elevating drill rig. In addition, since the tanks are submerged this mass is added without introducing its corresponding weight in the system. This allows the design for a more realistic (narrow) window that avoids natural harmonic responses. Figures 11A-11D illustrate a method for redeploying a non-coastal platform structure from a first site to a second site which has a different depth of water. The tank elements 110 floating and selectively weighted in the upper part of the base 12 of the rigid floating device are very difficult for this purpose. The request S.N. 08 / 129,829, described above, describes the use of sleeves or bushes 20 for piles, graded or leveled, having a first stage 60 which projects up a second stage or level 62. In the initial deployment, the piles are fixed to the sleeves or bushings of the pile in the first stage. Then, at the time of recovery and reuse, the sleeve or bush of the first stage is accessible for cutting, for example, by means of ROV operations. See ROV 122 in Figure HA. Cutting the sleeve or bushing 60 of the first stage with the connection of the pile to the bushing inside and the top of the pile inside., the platform is released from its connection e- -marked on the seafloor 24. Broken or knocked down piles may also require cutting below the sleeve or cap of the pile to release the base of the rigid floating device. Turning to Figure 11B, the water is then displaced with the pumped air towards the selectively floating and depositing tank elements 110B. A suitable pneumatic pump can be provided on the crane barge 116. Similarly, the air can also be pumped into one or more of the legs 14 of the base 12 of the rigid floating device, which are generally formed of hollow tubular articles. The bases of the rigid floating device having a quadrilateral shaped cross section can be aided by providing such buoyancy to the surface tower 28 supporting the corner. Other bases of the rigid floating device may benefit from additional flotation in general, in the legs of the rigid floating device or by means of auxiliary provisions. However, the volume of the flotation is provided on the upper part of the base of the rigid floating device and the base of the rigid floating device is lifted off the ocean floor and towards the surface 30 where the base of the rigid floating device that floats vertically it has sufficient stability to drive the non-coastal manufacturing operations supported or supported by the crane barge 116. All or part of the tower of the surface 28 is removed, see Figure 11C, and a resized surface tower 28A is installed. See Figure 11D. Consequently, significant differences in water depth "? D" can be accommodated in non-coastal operations involving only the surface tower. Such operations provide the base of the rigid floating device with a convenient versatility, which substantially improves its reuse by facilitating the resizing of the surface tower to correctly accommodate the depth of the water and cooperates with a cantilevered beam roof mounted on the headframe. drilling on a self-elevating drilling tower. The base of the reworked rigid floating device is then towed to a new site and redeployed, ballasting the elements of tanks 110 and legs 16. The base is then bolted to the 24th floor of the ocean by means of piles securely fixed within the sleeves or bushes 20 of the piles in the fixing profile 62 of the second stage. For longer towing distances, it may be desirable to provide an auxiliary float, to vertically position the platform for horizontal repositioning. On the site, it could be turned to the vertical and placed downwards. Other modifications, changes, and substitutions are also proposed in the foregoing description. In addition, in some cases, some features of the present invention will be employed without the corresponding use of other features described in these illustrative embodiments. Accordingly, it is appropriate that the appended claims be constructed broadly and in a manner consistent with the spirit and scope of the invention herein.

It is noted that in relation to this date the best method known by the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following

Claims (14)

1. A non-coastal platform structure for temporarily using a self-elevating drilling rig for drilling operations in deep water applications, comprising a base (12) of the rigid floating device cemented to the bottom, a surface tower (28) supported by the base of the rigid floating device and extending above the surface of the ocean (30), a deck of the platform supported by the surface tower, a supporting interconnection (26) for the subsea drilling tower, presented in the part upper of the base of the rigid floating device and adapted to support the self-elevating drilling tower (34) for drilling operations, characterized in that at least one emersion tank or air box (110) for the support of a drilling rig is connected To the support interconnection ie the drilling tower, such emersion tank or air box is provided with means to adapt the flotation of the same at different loading conditions due to the presence or absence of the self-elevating drilling tower on the support interconnection of the drilling tower.

2. A non-coastal platform structure according to claim 1, characterized in that the emersion tank or air box (110) supported by the derrick is a continuous foundation plate (110A) of the derrick, comprising a floating and selectively weighed tank element (112), an interconnection (114) of the base of the rigid floating device presented in the lower part of the tank element which is fixed on the upper part of the base of the rigid floating device on the support interconnection of the derrick, and a supporting interconnection (39) for the submarine, secondary drilling tower, presented in the upper part of the tank element, interconnected by internal structural elements in a load-bearing relationship with the interconnection of the base of the rigid floating device, and adapted to receive the self-elevating derrick.

3. A non-coastal platform structure according to claim 1 or 2, characterized in that it also comprises a fixing connection (140) of the continuous foundation plate between the support of the underwater derrick and the interconnection of the base of the floating device. rigid, to releasably secure the continuous foundation plate (110A) of the derrick to the base (12) of the rigid floating device, and a fixing connection (120) of the derrick between the self-elevating drilling tower and a support of the subsea, secondary drilling tower to fix or releasably secure the self-elevating drilling tower to the continuous foundation plate of the derrick and through the entire base of the rigid floating device.

4. A non-coastal platform structure according to claim 3, characterized in that the connection between the support of the underwater derrick and the interconnection of the base of the rigid floating device comprises a plurality of legs, (36A) with flanges extending outward, positioned downward, forming the interconnection of the base of the rigid floating device, a guide pin (37) extending downwardly from the flanged legs, a plurality of steel lattice structures forming the tower support of underwater drilling, positioned to receive the flanged legs in a load bearing relationship, a plurality of central recesses (146) in the steel lattice structures, positioned to receive the guide pin (37) extending from the legs with flanges, and a plurality of hydraulically driven clamping arms (41), mounted on the interconnection of the derrick underwater and placed to releasably secure the legs with flanges of the interconnection of the base of the rigid floating device.

5. A non-coastal platform structure according to claim 4, characterized in that the continuous foundation plate (110A) of the derrick is removable.

6. A non-coastal platform structure according to claim 2, characterized in that the (114) of the subsea drilling tower and the supporting interconnections (39) of the secondary subsea drilling tower each comprise a plurality of survey points. discrete contact and these respective sets of discrete contact points do not fully correlate in vertical alignment.

7. A non-coastal platform structure according to any of claims 1-6, characterized in that a plurality of the emersion tanks or air boxes (110B) for the support of the drilling tower are provided and wherein the interconnection (26 ) of the subsea drilling rig comprises a plurality of discrete contact points (38) which correspond to the footprint or tread of the self-elevating drilling tower, each tank (110B) forms an elongated tank element, oriented vertically, directly below one of the discrete contact points (38) of the interconnection of the Underwater drilling tower in a load-bearing relationship.

8. A non-coastal platform structure according to claim 1, characterized in that the support interconnection (26) of the subsea drilling tower comprises a plurality of discrete contact points (38) that correspond to the footprint or footprint of the tower. self-elevating piercing, and wherein the emersion tank or air box (110) for, the derrick support comprises a plurality of elongated, vertically oriented cylindrical tank elements (110B), each placed substantially below one of the discrete contact points (38) of the interconnection of the underwater derrick, in a load-bearing relationship and connected to the base of the rigid floating device at a plurality of levels of the frame.

9. A non-coastal platform structure, according to any of claims 1-8, characterized in that the base (12) of the rigid floating device cemented at the bottom forms a base of the rigid, suitable floating device designed for the dynamic response with the mass of the coupled lifting rig, and whereby the weight of the self-elevating drilling rig (34) is substantially offset by the flotation forces supplied by the emersion tank (110) for supporting the derrick when the self-elevating drilling tower is deployed on the base of the rigid floating device and the mass of the self-elevating drilling rig is substantially replaced in the structure of the non-coastal platform by adding water as a ballast in the emersion tank or air box (110 ) for the support of the drilling tower, when the self-elevating drilling tower (34) is removed to contri To avoid harmonic periods for the appropriate tower during production operations which do not require the presence of the self-elevating drilling tower.

10. A method for redeploying or cing a non-coastal platform structure according to claim 8, from a first site to a second site, characterized in that it comprises releasing a connection between the base of the rigid floating device and a plurality of piles ( 22) which are anchored on the floor of the ocean in the first site, the release comprises cutting through a plurality of sleeves or ferrules (20) of the piles and the piles fixed therein to remove the connections of the sleeve or bushing from pile to pile in a first extended stage of the sleeves or caps (20) of the piles, vertically raising the structure of the non-coastal platform (12) by pumping air towards the elements of the tank (110B), towing the non-coastal platform structure to the second site, vertically lowering the non-coastal structure by ballasting the elements of the tank (110B), installing the platform at the second site with the surface tower above the surface of the ocean and an interconnection of the subsea drilling rig presented within the depth capacity of a self-elevating drill rig.

11. A method for redeploying or changing facing a non-coastal platform structure according to claim 10, characterized in that the base (12) of the underwater rigid floating device has a quadrilateral shaped cross-section having four legs (14), three of the legs each provide a direct support for one of the discrete contact points, the fourth leg provides the main support for the surface tower (28), and the method further comprises providing an additional float under the surface tower (28)

12. A method for redeploying a structure of the non-coastal platform according to claim 10 or 11, characterized in that the vertical elevation of the structure of the non-coastal platform further comprises raising the base (12) of the underwater rigid floating device until the base from the tower the surface is above the surface of the ocean.

13. A method for redeploying a non-coastal platform structure according to any of claims 10-12, characterized in that it also comprises resizing the tower of the surface by removing the tower from the old surface (28) of the base of the rigid floating device. submarine and install a new tower from the surface to the base of the submarine rigid floating craft.

14. A method for redeploying a non-coastal platform structure according to claim 13, characterized in that the resizing of the surface tower (28) comprises removing a deck from the tower from the surface, shortening the tower from the surface and installing another cover over the top of the tower of the shortened surface.