Drilling ship with two drilling centres

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to shelf drilling. A drilling ship includes the first drilling centre including a storage for the first marine risers, the second drilling centre for drilling of the second well from the same ship, which includes a storage for the second marine risers. The latter have a diameter that is smaller than that of the first marine risers. The ship includes two blowout preventers for the second drilling centre. A drilling method provides for creation of a drilling ship with two separating and different drilling centres, each of which is capable of well drilling; provision of marine risers for each drilling centre; diameter of marine risers for one of the drilling centres is smaller than that of marine risers for the second drilling centre; provision of two blowout preventers according to the smaller diameter of a marine riser of an auxiliary drilling centre.

EFFECT: providing drilling of a well from one ship from two different drilling centres, and namely under arctic conditions.

19 cl, 5 dwg

 

The technical field to which the invention relates

In General, the present invention relates to the operation of offshore drilling.

The level of technology

Operation of offshore drilling can be done using a number of different drilling platforms that can be attached to the sea bottom. Platforms of this type can be effective when drilling at relatively shallow depths. At greater depths, however, to conduct such operations deepwater drilling, it is desirable to use ships or semi-submersible drilling rigs.

Such vessels or installation, you can install exactly in the desired place, using a drill to drill the hole exactly in the desired location. In dynamic positioning, the position of a vessel or drilling rig can be saved even in heavy sea conditions. Used here, the term "vessel" means any floating platform able to move on their own, pushed, drawn or towed. It includes semi-submersible drilling rigs and vessels.

Thus, several exploratory wells can be drilled one after the other in conditions of deep-sea drilling, for example, on the continental shelf of the United States, Africa, Asia, or Western Europe. However, a large number of operations�, required to be made with the successful drilling of several exploratory wells even in the same area may be related to the extremely time-consuming due to the complexity of operations deepwater drilling.

Having a normal ship with a single drilling platform, it is impossible to perform multiple drilling operations simultaneously. Thus, the time periods required for the completion of each borehole, can be quite long. Since, as a rule, these drill ships are operated under lease, the more time required to drill one well, the more expensive it is obtained.

Known so-called drill ships with two drill centres. Such vessels can be equipped with two drilling units; the ship serves as a support structure located below the drill pipe. Double rigs for drilling can be used to some extent in parallel. For example, while one operation is performed on the same tower, another operation may be performed on another tower. However, in any case, only one well can be drilled, only one center drill used for drilling, while the other should be used to support drilling single wells.

Brief description of the drawings

Fig.1 shows a plan view �urologo vessel in accordance with one possible embodiment of the invention.

Fig.2 shows a side view of the vessel shown in Fig.1 in accordance with one possible embodiment of the invention.

Fig.3 is a schematic view of drilling operations from a single drill centre on the vessel shown in Fig.2, in accordance with one possible embodiment of the invention.

Fig.4 is a schematic view of the process of drilling with the second drill centre in accordance with one possible embodiment of the invention.

Fig.5 is a diagram of a disconnection of the main drill centre from the wellhead in case of refusal, in accordance with one possible embodiment of the invention.

The implementation of the invention

As shown in Fig.1, double drilling vessel 10 for drilling operations can be a vessel capable of ensuring the conduct of drilling operations in deep and ultra-deep waters. The vessel 10 may also be a semi-submersible drilling rig. This boat can be equipped with conventional means of dynamic positioning, allowing precise positioning of the ship in the desired location. In addition, during the drilling operations, the vessel may be held accurately in position by means of computer control.

In some embodiments, the implementation�display of the invention the vessel may be equipped with main drilling center 14 (RBV) and auxiliary drill center 12 (household balance VBC). Using each of the drill centres it is possible to descend videocalifornia columns. In some embodiments, the main drilling center 14 is used for key drilling operations. In case of failure of the primary center drill can be detached, the ship can be moved to a position corresponding to the location of the auxiliary drill center 12, and pull videocalifornia columns from auxiliary drill center with the objective discharge of drilling wells in connection with the impossibility of carrying out a drilling operation with the main drill centre.

Described drill ships drill can have a wide range of applications. For example, during drilling operations in Arctic conditions, it is generally advisable to have a backup of the drilling vessel at the place of work. In this case, when a problem occurs on the primary drilling vessel to a work may enter the auxiliary drilling vessel. But given the cost of drilling vessels, the presence of two courts at the place of work is extremely expensive. In accordance with some embodiments of implementing the present invention, a single drill ship can perform the same tasks, and that two drilling vessels that previously required. It should be noted that conventional drilling vessels for carrying out drilling rebote can carry out the drilling of two wells with two different drill centers and descent videocalifornia columns for offshore drilling with two different drill centers impossible.

In one of the embodiments of the invention the main and auxiliary drill centers can be installed on the hydraulic power cylinders. In other embodiments, may be provided for the tower or superstructure of the tower. Such towers or tower can serve as a support structure for supporting tubular elements hanging from these towers.

Conversely, when using the hydraulic system of pipes wells can be supported directly from the deck of the ship. This eliminates the need for expensive heavy towers to support the pipe system. However, in some embodiments, to control the system of pipes, when they are in the raised position, can be used even hydraulic system, mast or guides.

Thus, depending on the type of centers 12 and 14, may be used various tube storage device. For example, using a system of towers the towers shall be of sufficient strength so that the pipe could be stored, just against the inner part of the tower. In other cases, to hold the assembled or partially assembled pipe pipe can be used cumulative sist�we sadnessthe frames and pipe shops.

As shown in Fig.1, according to one possible arrangement for auxiliary drill center 12 may be provided in pipe stores 30 and 32, and for the main drilling center 14 pipe shops 34 and 36. Pipe shops 34 and 36 may contain various tube elements, including videocalifornia columns. Similarly, pipe stores 30 and 32 associated with the auxiliary drill center can also serve to store various pipe elements, including videocalifornia columns. However, in some embodiments, videocalifornia columns used in auxiliary drill center, may have a smaller diameter to reduce the total load on the ship, providing, however, the possibility of drilling with the help of auxiliary drill center.

For example, conventional videocalifornia column for drilling may have a nominal diameter 21¼ inches (53,975 cm), while videocalifornia columns, stored in pipe stores 30 and 32 relating to auxiliary drill center may have a smaller diameter, for example 13⅝ inches (34,6075 cm) (videocalifornia columns for pressure 10000 pound-forces/square inch (68,95 MPa)).

Despite the fact that, as shown in Fig.2, pipe bookstore�NY 32 and 36 are located to the left of drill centers 12 and 14, in some possible embodiments, performance data pipe shops can be in front or behind and to the right of the drill centres. In addition, as noted above, in some embodiments, a single pipe shops may not be needed, and, if possible, the tubular elements can be stored just leaning against the inner surface of the drill centers 12 and 14.

To move, pull, remove lifting or rotation of the pipe to the seabed or, eventually, inside the sea bed can be used with conventional drilling equipment. This can be used waste, hydraulic swivels, pulleys, drilling winches, rotary tables, tackle blocks, compensators pitching, hydraulic actuators, or any other known equipment. The hydraulic actuator may support a pipe on the deck, but the tower can hold the pipe above the deck. The present invention is in no way limited to any specific equipment.

As shown in Fig.3, the main drilling center 14 includes a tensioning device 22 videocalifornia columns. It also includes videocalling column 24, which in one possible implementation is a conventional videocalling column, nominal outer diameter which, as a rule, is 21¼ inches (53,975 cm). In the lower cha�ti videocalifornia column 24 may be provided with a mechanical locking emergency disconnect 25 videocalifornia columns. To disconnect 25 can be attached to the lower sealing device videocalifornia columns (LMRP) 26a. The lower sealing device 26a videocalifornia column serves to detach the blowout preventer (PVP) 26 connected to the lower sealing device 26a videocalifornia columns with brittle connections. And finally, in one of possible embodiments of PVP 26 may be a standard underwater PVP with an inner diameter 18¾ inches (47,625 cm).

The lower sealing device 27 videocalifornia columns are connected to the blowout preventer 26 (PP) so that you can disconnect located above the elements from below the subsea disconnect device (SSA) 27. In one of the embodiments of the invention underwater tripping device 27 may include management tools, independent from the management of PVP 26. In one of the embodiments of the invention underwater disconnecting device may be a standard device with an inner diameter 18¾ inches (47,625 cm).

Finally, the underwater marine the mouth 28 of the well can be cemented into the seabed. In some embodiments, this inner wellhead can be a standard wellhead equipment with the inside�him diameter 18¾ inches (47,625 cm).

Thus, the mouth 28 of the borehole can be installed from the main drilling center 14, and in the absence of any problems auxiliary drill center 12 may not be necessary. However, in some embodiments, can run parallel drilling operations, so that the pipe can prepare in advance with an auxiliary drill center 12 in order to simplify the process of drilling on the main drilling center 14. In other embodiments, the auxiliary drill center 12 is used only as a backup in case of failure associated with the main drilling center 14.

As shown in Fig.4, in case of implementing auxiliary drill center 12 blowout preventer with fine videocalifornia high pressure column 40 provides a process discharge of drilling wells with auxiliary drill center 12. This can be useful in the event of a failure basically drill the center when the main drill centre can no longer work. For security reasons it may be desirable to create a relief well as soon as possible. However, in some embodiments, the presence of the second drilling ship is no longer necessary, as the aforementioned task m�can only perform one drill ship.

These tensioning device 38 videocalifornia columns can be permanently installed on the auxiliary drill center 12. May be provided in the upper blowout preventer 39. In one of the embodiments of the invention VFR 39 may be a blowout preventer with an internal diameter of 13⅜ inches (33,9725 cm). Videocalifornia column 40 column can be of a smaller diameter, designed for pressure up to 10,000 lbf/sq inch (68,95 MPa), one of the possible variants of implementation, with an internal diameter of 13⅜ inches (33,9725 cm). Because videocalifornia column 40 has a smaller diameter, in some embodiments, it is easier to be transported on the same vessel together with videocalling column 24 without overloading the vessel.

The lower sealing device 42A videocalifornia column is used to disconnect videocalifornia column 40 from the lower blowout preventer 42. In one of the embodiments of the invention the lower blowout preventer 42 can be a standard PVP with an internal diameter of 13⅜ inches (33,9725 cm). Underwater sea mouth 28 of the borehole with a thin inner diameter can be cemented into the seabed. In one of the embodiments of the invention, the inner diameter is given�wow underwater marine estuary can be 13⅜ inches (33,9725 cm).

One of the possible applications of the vessel 10 may be a situation when there is an initial free release, including the flow of hydrocarbons through the main drill centre 14a, and the borehole is closed by means of a stop element on an independently controlled underwater tripping device 27. In this worst case videocalling column 24 cannot be detached from the blowout preventer 26 due to the complete failure of the control cable and the acoustic isolator on PVP 26, and also independent of the disconnector on the lower sealing device 27A videocalifornia between columns 26 and PVP underwater disconnect device 27. In this situation, it is necessary to detach videocalifornia 24 columns directly above the lower sealing device 26a by activating a mechanical emergency locking disconnect 25, as shown in Fig.5. The situation shown in Fig.5 is one example when you need to discharge drilling of the well to control the internal pressure of the well or control uncontrolled release of hydrocarbons in the underwater drilling due spouting.

Thus, as shown in Fig.4, a relief well can be drilled using the same vessel 10. First drilling vessel 10 is moved� thus, to place the auxiliary drill center 12 above the location of the discharge hole. Then predrilling unloading wells with auxiliary drill center 12. When the guide column and the guard lowered and cemented, can pull the underwater blowout preventer and videocalling column in the configuration shown in Fig.4. You can then perform the suspension of the underwater blowout preventer and videocalling columns, the tension of the tensioning device 38 and the telescopic lengthening of the connections to the auxiliary drill center 12. Next, the discharge drilling of the borehole by means of an auxiliary drill center 12.

In some embodiments, the main and auxiliary drill centers can provide staging videocalifornia column length 5000 ft (1524 m) each. This length videocalifornia columns is sufficient for drilling in many offshore regions, including the Arctic, where the maximum depth is around 3,500 feet (1066,8 m).

In this description, any mention of "one of the possible embodiments of the invention" or "embodiment of the" means that the particular distinctive feature, structure or characteristic described in�connection with the execution, is used in at least one embodiment of the present invention. Thus, the use of the terms "possible variant of implementation" or "in one of the possible variants of implementation" is not required in relation to the same embodiment. Furthermore, the particular features, structures or characteristics may be used in other suitable embodiments, execution in addition to this presents a particular embodiment of the invention, and all such variations are covered by the clauses given below the claims.

Although the present invention has been described with respect to a limited number of embodiments, specialists in this field are obvious and other possible modifications and variations of the present invention. It is assumed that the attached claims cover all such modifications and variations covered the real essence and scope of the invention.

1. The method of drilling involving
the establishment of the drilling vessel with two separate and different drill centers, each of which is capable of performing drilling wells; and
do videocalling columns for each of the drill centres and d�Amer videocalifornia columns for one of the drill centres is less than the diameter videocalifornia columns of the second drill centers and including
providing two blowout preventers in accordance with a smaller diameter videocalifornia column auxiliary drill center.

2. A method according to claim 1, comprising providing the storage videocalifornia columns for each of the drill centres.

3. A method according to claim 1, which includes the provision of equipment needed for discharge of drilling wells from the same vessel, which was drilled faulty wells.

4. A method according to claim 3, which includes the permanent installation of tensioning devices videocalifornia columns on the above auxiliary drill center.

5. A method according to claim 1, including a connecting videocalifornia columns to lower the blowout preventer through the lower sealing device videocalifornia columns.

6. A method according to claim 5 including providing an upper blowout preventer between said tensioning device and the specified videocalifornia columns.

7. A method according to claim 1, comprising providing the lower sealing device videocalifornia columns between the blowout preventer on the specified auxiliary drill the centre and these videocalifornia columns.

8. A method according to claim 1, which includes providing mechanicalbiological emergency disconnect on drill center with a large diameter videocalifornia columns.

9. A method according to claim 8, including connecting the disconnect to the lower sealing device videocalifornia columns.

10. A method according to claim 1, which includes providing underwater tripping device for drill center with a large diameter videocalifornia columns.

11. Drilling vessel that contains:
first drill the center, which includes a repository for storing the first videocalifornia columns;
the second center drill for drilling a second well from the same vessel, comprising a container for the second videocalifornia columns, and the specified second videocalifornia columns have a smaller diameter than the first videocalifornia columns,
the ship contains two blowout preventer for the specified second drill center.

12. The ship according to claim 11, providing the possibility of proburivaya unloading wells with the specified second auxiliary drill center in the event of failure of wells drilled from the first drill center.

13. The ship according to claim 12, containing the tensioner videocalifornia columns, permanently installed on a specified second drill centre.

14. The ship according to claim 12, containing the lower blowout preventer connected to videocalifornia columns with the lower sealing device�TWA videocalifornia columns.

15. The ship according to claim 14, comprising upper blowout preventer between said tensioning device and the specified videocalifornia columns.

16. The ship according to claim 12, containing the lower sealing device videocalifornia columns between the blowout preventer on the specified second drill centre and these videocalifornia columns.

17. The ship according to claim 11, comprising mechanical locking emergency disconnect on the second drill centre.

18. The ship according to claim 17, containing the specified disconnect connected to the lower sealing device videocalifornia columns.

19. The ship according to claim 11, wherein said second drill center includes two blowout preventer, and the specified first drill the center includes only one blowout preventer.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the development of subsea mineral deposits mainly in arctic conditions and it may be used for underwater drilling and completion of wells notwithstanding meteorological and ice conditions at the surface. Underwater drilling facilities consist of an underwater drilling rig, a seafloor template, and an underwater supply vessel. The underwater drilling rig is made as a set of separate modules, for example, a drilling module an accommodation and control module, a power module and modules for expendable materials storage. The power module is connected by cable connections to the drilling module, accommodation and control module, and the modules for expendable materials storage. The accommodation and control module is connected by signal cables with the drilling module, power module, and the modules for expendable materials storage. The modules for expendable materials storage are connected to the drilling module by hoses.

EFFECT: improved operational efficiency of drilling equipment in arctic conditions.

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FIELD: electricity.

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FIELD: mining.

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2 cl, 5 dwg

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FIELD: transport.

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4 dwg

FIELD: oil and gas industry.

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14 cl, 13 dwg

FIELD: electricity.

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18 cl, 7 dwg

FIELD: oil and gas industry.

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EFFECT: increasing development efficiency of subsea oil and gas deposits.

9 cl, 56 dwg

FIELD: construction.

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1 dwg

FIELD: transport.

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EFFECT: improved operational characteristics of drilling ship during prospecting and exploratory drilling on arctic shelf.

1 dwg

FIELD: oil and gas industry.

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EFFECT: preventing vertical resonance of the platform in extreme sea conditions due to increase of free oscillation period for the platform heaving.

7 cl, 5 dwg

FIELD: mining.

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EFFECT: increased efficiency and safety of development of hydrocarbon deposits of the Arctic shelf.

2 cl

FIELD: oil-and-gas industry.

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EFFECT: higher survivability of drilling platform at well fluid flowing.

5 cl

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to compensators for vertical displacements of sea platform caused by roll. Device 100 serves to damp the forces between two interconnected parts in pipe string. Bottom part 101 is connected with top end of string element 105, 3a extending into underwater well 5. Top part 103 is suspended from self-floating surface plant 1 with the help of suspension element 3b extending to said surface plant. Device 100 is arranged pipe string above element 3a extending into said underwater well and above at least one part of said suspension element 3b. Device 100 comprises top and bottom sections 109, 111. Said sections can vertically displace relative to each other to cause pliancy to impact forces between said interconnected top and bottom parts 103, 101. Said impact forces are caused by roll of suspension elements 3b displacing relative to string element 3a.

EFFECT: efficient damping and protection of thread extreme turns.

15 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the development of subsea mineral deposits mainly in arctic conditions and it may be used for underwater drilling and completion of wells notwithstanding meteorological and ice conditions at the surface. Underwater drilling facilities consist of an underwater drilling rig, a seafloor template, and an underwater supply vessel. The underwater drilling rig is made as a set of separate modules, for example, a drilling module an accommodation and control module, a power module and modules for expendable materials storage. The power module is connected by cable connections to the drilling module, accommodation and control module, and the modules for expendable materials storage. The accommodation and control module is connected by signal cables with the drilling module, power module, and the modules for expendable materials storage. The modules for expendable materials storage are connected to the drilling module by hoses.

EFFECT: improved operational efficiency of drilling equipment in arctic conditions.

3 cl, 1 dwg

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