Key information

Title: Cantilever structure with a hoist crane assembly
Application number: 20171677
Case type: National
Status: 16.01.2019 P.g.a. manglende svar. Søker har ikke begjært gjenopptakelse
Filed: 19.10.2017
Priority: 30.03.2017 NO 20170528 and others
Effective date: 19.10.2017
Publicly available: 01.10.2018
Applicant: Dwellop AS (NO)
Inventor: Jens Olav Myklebust (NO)
Agent: PROTECTOR IP AS (NO)

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.

The present invention relates to a cantilever structure for use in well intervention operations, which cantilever structure is arranged on a platform deck of a jack- up rig or a liftboat, the cantilever structure being moveable relative to the platform deck, one end of the cantilever structure being adapted to be retractably extended beyond the perimeter of the rig deck, which cantilever structure end carries a hoist crane assembly adapted to manipulate loads underneath the cantilever structure.

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Date

Date	Doc. No.	Process	Case number	In/Out	Journal description	To/from
26.07.2019	06-01	Saksbehandling	20171677	UT	Endelig Henleggelse	PROTECTOR IP AS
30.01.2019	05-01	Saksbehandling	20171677	UT	Henlagt manglede svar EN	PROTECTOR IP AS
15.11.2018	04-02	Saksbehandling	20171677	INN	Hovedbrev	PROTECTOR IP AS
15.11.2018	04-01	Saksbehandling	20171677	INN	Korrespondanse (Hovedbrev inn)	PROTECTOR IP AS
16.05.2018	03-02	Saksbehandling	20171677	UT	PT report 12:19:47
16.05.2018	03-01	Saksbehandling	20171677	UT	Realitet patent	PROTECTOR IP AS
27.10.2017	02-02	Saksbehandling	20171677	INN	Hovedbrev	Protector Intellectual Property Consultants AS
27.10.2017	02-01	Saksbehandling	20171677	INN	Korrespondanse (Hovedbrev inn)	Protector Intellectual Property Consultants AS
19.10.2017	01-07	Saksbehandling	20171677	INN	Sammendrag	Protector Intellectual Property Consultants AS
19.10.2017	01-06	Saksbehandling	20171677	INN	Erklæring Søkers rett til oppfinnelse	Protector Intellectual Property Consultants AS
19.10.2017	01-05	Saksbehandling	20171677	INN	Patenttegninger	Protector Intellectual Property Consultants AS
19.10.2017	01-04	Saksbehandling	20171677	INN	Fullmakt	Protector Intellectual Property Consultants AS
19.10.2017	01-03	Saksbehandling	20171677	INN	Beskrivelse	Protector Intellectual Property Consultants AS
19.10.2017	01-02	Saksbehandling	20171677	INN	Krav	Protector Intellectual Property Consultants AS
19.10.2017	01-01	Saksbehandling	20171677	INN	Søknadsskjema Patent	Protector Intellectual Property Consultants AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.

Description

CANTILEVER STRUCTURE WITH A HOIST CRANE ASSEMBLY

Technical Field

The present invention relates to a cantilever structure for use in well intervention operations, which cantilever structure is arranged on a platform deck of a jackup rig or a liftboat, the cantilever structure being moveable relative to the platform deck, one end of the cantilever structure being adapted to be retractably extended beyond the perimeter of the rig deck, which cantilever structure end carries a hoist crane assembly adapted to manipulate loads underneath the cantilever structure.

Background Art

The present invention relates to structural supports on jack-up rigs and liftboats when activity like intervention operations, is to take place from such rigs and boats. Such activity is one or more among coiled tubing, wireline and well plugging operations.

EP 2243 922 is an example illustrating a technique that facilitates coiled tubing operations in offshore environments.

Summary of invention

This is provided by a cantilever structure of the introductory described nature, which is distinguished in that one or more hoists are arranged on a moveable crane chassis arranged underneath said cantilever structure on a crane beam structure, which crane chassis and crane beam structure are moveable in a substantially horizontal plane by means of rollers or sliders driven on rails fixed to said cantilever structure.

In one embodiment said rails are arranged at the underside of the cantilevered structure, separately arranged of a cantilever structure rails for moving the cantilever structure relative the platform deck.

In another embodiment said crane chassis are movable between a resting position where the crane beam structure is retracted to a position of the crane chassis near the underside of the cantilever structure and a working position where the crane beam structure are extended to a position of the crane chassis a predermined distance away from the cantilever structure.

In yet a further embodiment the crane beam structure is movable between the resting position and working position by a piston arrangement, an hydraulic cylinder or a rotating lifting screw.

In a further embodiment, the cantilever structure comprises two hoist crane assembly, each hoist crane assembly is movable on separately arranged rails.

In a further embodiment a hoist is slidingly attached to the crane chassis.

In another embodiment , the crane chassis is rotatable arranged on the crane beam structure.

In another embodiment, said rails are integrated with the borders of the cantilevered structure and corresponds to cantilever rails adapted to be slidingly attached to the cantilever structure.

In one embodiment, the cantilever structure comprises two hoists arranged on respective ends of the crane beam structure.

In another embodiment, the cantilever structure comprises one hoist arranged on a gantry crane beam structure and beam-mounted crane chassis, which gantry crane beam structure being moveable in a substantially horizontal plane in x and y directions, respectively, by means of rollers driven on rails fixed to the cantilever structure and gantry crane beam structure, respectively.

Preferably, the rails of the gantry crane beam structure extend longitudinally of the gantry crane beam structure and transversally of the cantilever structure.

In one embodiment, the rails of the cantilever structure extend longitudinally of the cantilever structure.

Preferably, each hoist is mounted on a trolley running on a cantilevered crane beam.

In one embodiment, the cantilevered crane beam is arranged as a telescopic beam, which telescopic beam is extendable in its longitudinal direction.

The cantilevered crane beam can be slewably arranged to the beam-mounted crane chassis.

Each hoist running on a cantilevered beam can enable loads to be delivered externally of the cantilever structure perimeter and drilling rig perimeter.

In one embodiment, the cantilever structure can include a derrick.

The intervention operations is normally one or more among coiled tubing, wireline and well plugging operations.

In one embodiment, the cantilevered crane beam includes an auxiliary hoist arranged on the end of the cantilevered crane beam.

While the various aspects of the present invention has been described in general terms above, a more detailed and non-limiting example of an embodiment will be described in the following with reference to the drawings, in which:

Brief description of drawings

Fig. 1 shows in a perspective view a schematically drawn jack-up rig that includes a cantilever structure moveably arranged on the deck of the jack-up rig,

Fig. 2 shows a detailed view of the encircled view 4 of fig.1, which also more clearly shows a hoist/crane assembly arranged to the cantilever structure according to the present invention, and a lower wellhead template platform,

Fig. 3 shows in a perspective view from above the cantilever structure and derrick assembly separated from the jack-up platform,

Fig. 4 shows in a perspective view from below the cantilever structure and derrick assembly according to fig.3,

Fig. 5 shows in a perspective view from below the hoist/crane assembly separated from the cantilever structure and derrick assembly,

Fig. 6 shows in a perspective view from above the hoist/crane assembly separated from the cantilever structure and derrick separated as shown in fig.5,

Fig. 7 shows in a perspective and elevated view the hoist/crane assembly according to fig.5 and 6,

Fig. 8 shows in a perspective view from above an embodiment of the cantilever structure and hoist/crane assembly without a derrick and separated from the jack-up platform,

Fig. 9 shows in a perspective view from above a different view than fig.8, but the same embodiment of the cantilever structure and hoist/crane assembly as shown in fig.8,

Fig. 10 shows in a perspective view from below the same embodiment of the cantilever structure and hoist/crane assembly as shown in fig.8 and 9,

Fig. 11 shows in a perspective view a second embodiment of the hoist/crane assembly arranged to the cantilever structure of the jack-up rig,

Fig. 12 shows in a perspective view from above the hoist/crane assembly shown in fig.11,

Fig. 13 shows in a perspective view the second embodiment of hoist/crane assembly separated from the cantilever structure and the jack-up rig, and

Fig. 14 shows the hoist/crane assembly shown in fig.13 in a perspective view from above.

Figure 15 shows a perspective view from below a third embodiment of the hoist/crane assembly of the cantilever structure.

Figure 16a shows the hoist crane assembly from figure 15 viewed separate from the cantilevered structure in a retracted resting position.

Figure 16b shows an embodiment the hoist crane assembly from figure 15 viewed separate from the cantilevered structure in an extended working position.

Figure 17a-17d shows the embodiment of the hoist/crane assembly from figure 15 viewed from different sides.

Figure 18 shows a perspective view of a fourth embodiment of the hoist/crane assembly of the cantilever structure.

Figure 19a-b shows the hoist crane assembly from figure 18 viewed separate from the cantilevered structure in an extended working position, viewed from different sides.

Figure 20a-20bshows the embodiment of the hoist/crane assembly from figure 18 arranged on rails, viewed in a retracted resting position.

Figure 21 shows a perspective view of the third and fourth embodiment of the hoist/crane assembly of the cantilever structure attached to the same cantilever structure.

Detailed description of the invention

Reference is made to fig.1 showing in a schematically perspective view a jackup rig 3. The jack-up rig 3 includes a rig deck 2. The rig 3 shown has three legs 16 extending into the sea and are supported by the seabed. The deck 2 can be elevated and lowered relative to the sea surface as desired for the particular job or operation to be performed. The jack-up rig 3 also includes a cantilever rig 1, here termed a cantilever structure 1. The cantilever structure 1 is moveably arranged on the deck 2 of the jack-up rig 3. It is to be understood that a jack-up rig is illustrated and described here, but could easily be replaced by a jack-up barge or liftboat well known for the artisans within the oil field industries.

In the fig.1 embodiment, a derrick 15 is shown arranged on top of the cantilever structure 1. The derrick 15 is located on that end 1a of the cantilever structure 1 enabling the derrick 15 to perform intervention operations towards a wellhead template platform 17 located underneath the cantilevered end 1a of the cantilever structure 1. An enlarged view of this is encircled and marked by a number “D4” shown in fig.2 as “DETAIL 4”.

The cantilever structure 1 is designed for use in well intervention operations, and the cantilever structure 1 is arranged on the rig deck 2 to be moveable back and forth on the deck 2. During such movement on the deck 2, one end 1a of the cantilever structure 1 can be extended beyond the perimeter P of the drilling rig 3 deck 2. Subsequent to an intervention operation, the cantilever structure 1 can be retracted back onto the rig deck 2. Then the entire jack-up rig 3 can be removed and transported to a different location.

As more clearly shown in fig.3 and 4, the cantilever structure end 1a carries a crane assembly C supporting a hoist 4. The crane assembly C including the hoist 4 is adapted to manipulate loads L underneath the cantilever structure 1.

The hoist 4 is in turn arranged on a moveable beam-mounted crane chassis 5, as detailed clearly in fig.5, 6 and 7. The crane chassis 5 is arranged underneath, or at the bottom of the cantilever structure 1 on a gantry crane beam structure 6. The beam-mounted crane chassis 5 and gantry crane beam structure 6 are moveable in a substantially horizontal plane in orthogonal x and y directions, respectively. This is enabled through use of rollers R1, R2 driven on rails 7, 8, which are fixed to the cantilever structure 1 and gantry crane beam structure 6, respectively. The hoist 4, the crane chassis 5 and the gantry crane beam structure 6 is in this specification termed a crane assembly C.

In one embodiment, the crane assembly C can be used as indicated in fig.3 and fig.4 just where the reference number 4 is pointing, i.e. without the use of the cantilevered crane beam 10 shown.

As shown in further details in fig.5, 6 and 7, the rails 8 of the gantry crane beam structure 6 extend longitudinally of the gantry crane beam structure 6 and transversally of the cantilever structure 1. In turn, the rails 7 of the cantilever structure 1 extend longitudinally of the cantilever structure 1.

In one embodiment, a second hoist 4’ is mounted on a trolley 9 that is arranged to be running back and forth on the cantilevered crane beam 10. It is to be noted that the main hoist 4 can be used together with a sheave 11 near the end of the cantilevered crane beam 10. The wire from the hoist 4 then extend substantially horizontal along the beam 10, turning into vertical direction after having passed the sheave 11. As clearly shown in fig 5, an auxiliary (smaller) hoist 4’’ can be mounted to the very end of the cantilevered beam 10.

In still another embodiment, the cantilevered crane beam 10’ is arranged as a telescopic beam. This means that telescopic beam is made up by sections nested into each other. The sections are extendable in their longitudinal direction, either hydraulically or by electro mechanic means.

The cantilevered crane beam 10; 10’ will normally be slewably arranged to the beam-mounted crane chassis 5 as shown in fig.6 by an annular suspension ring 12.

The second hoist 4’ running on the cantilevered crane beam 10; 10’ enables loads L to be delivered externally of the cantilever structure 1 perimeter P’ in addition to the drilling rig perimeter P.

Even if not strictly necessary for all type of operations, the cantilever structure 1 normally includes the derrick 15. However, as illustrated in fig.8, 9 and 10, the cantilever structure 1’ is omit any derrick. All other elements are the same as in fig. 1 to 7 in various versions.

As mentioned, the arrangement with the cantilever structure 1, 1’ is design for performing intervention operations, such as one or more among coiled tubing, wireline and well plugging operations.

With reference to fig.1, the cantilever structure 1, 1’ can be retracted onto the rig deck 2 in its entirety. In such situation, it is necessary to park the hoist crane assembly C away from the underside of the cantilever structure 1,1’. An alternative is to retract the cantilever structure 1,1’ just enough to let the hoist crane assembly C remain suspended and cantilevered just adjacent to the deck perimeter P and let the cantilever structure 1,1’ rest in such position.

As indicated, the crane assembly C will be working underneath the cantilever rig. The cantilever rig is designed to skid outwards of the vessel transom, over existing platforms to do well work on oil wells. The crane assembly C will be utilized for handling equipment on the platform hatch deck, primarily underneath the cantilever where the main rig-crane does not have coverage.

The crane assembly C will also be used for holding the wire line stack during SIMOPS (Simultaneous Operations) on a neighboring well. In addition to holding the stack, it will hold the wire line sheave and handle tool changes with the wire line tool winch.

As with the first embodiment, the cantilever structure 1A shown in fig.11 and 12 is also designed for use in well intervention operations, and the cantilever structure 1A is arranged on the rig deck 2A to be moveable back and forth on the deck 2A. During such motion on the deck 2A, one end 1Aa of the cantilever structure 1A can be extended beyond the perimeter PA of the drilling rig 3A deck 2A. Subsequent to an intervention operation, the cantilever structure 1A can be retracted back onto the rig deck 2A. Then the entire jack-up rig 3A can be removed and transported to a different location.

Adjacent to the cantilever structure end 1Aa, a second embodiment of the crane assembly CA supporting two hoists 4A and 4B, is carried. The hoists 4A and 4B are adapted to manipulate loads L underneath the cantilever structure 1A independently of each other. The suffix “A” is used as an addition to the reference numbers used in the first embodiment to indicate the same or similar element or part on the second embodiment.

The hoists 4A and 4B are arranged on respective crane chassis 5A at respective ends of a moveable crane beam structure 6A, as shown in fig.13 and 14. Each hoist 4A and 4B is moveably carried by respective cantilevered crane beams 10A and will normally be slewably arranged to the crane chassis 5A as can be understood from studying fig.11 to 14.

The moveable crane beam structure 6A is arranged underneath, or at the underside of the cantilever structure 1A. The crane beam structure 6A is moveable in a substantially horizontal plane in the longitudinal direction of the cantilever structure 1A. This is enabled through use of rollers RA driven on rails 7A, which are fixed to the cantilever structure 1A. The hoists 4A and 4B, the crane chassis 5A, the cantilevered crane beams 10A and the crane beam structure 6A are termed the crane assembly CA.

In one embodiment, the crane assembly CA can be used as indicated in fig.13 and fig.14 for hoist 4A, i.e. without the use of the cantilevered crane beam 10A shown. All the various aspects of the hoist and crane beam 10 of the first embodiment can be adopted to the second embodiment as desired.

The following figures 15-21 shows additional three embodiments of a hoist/crane assembly of the cantilever structure. All of the hoist/crane assemblies are in these following embodiments attached to the cantilevered structure 1, 1A in a separate rail or rails that do not form part of the cantilever end 1a as in the first and second embodiments of the invention.

The rails that the cantilever is adapted to slide along is also called cantilever rails 7 and the rails where the hoist crane assembly is adapted to slide along is also called hoist crane rails 27, 37. This refers to all the following embodiments.

The other features of the cantilever structure 21 are equal to the cantilever structures (1, 1A) as disclosed in the first and second embodiment. The slidably connection of the cantilever to a jack up structure 23 is indicated by the blocks with reference number 23. The use of cantilever structure 21 on the jack up rig for various works, such as well intervention as described in both previous embodiments are also applicable for the cantilever structure 21 as disclosed in the following three embodiments.

For the sake of simplicity for the reader, the same parts in the embodiments have same reference number.

Figure 15-17e discloses a third embodiment of the hoist/crane assembly of the cantilever structure viewed from below.

The hoist/crane assembly 20 comprises a crane beam structure 26, a crane chassis 25 and a hoist 24 as shown in the figures.

In this embodiment, the hoist 24 is moveable arranged on the crane chassis 25. The crane chassis 25 is formed as an elongated structure 25. The hoist 24 having rollers, sliding pads or sliders (figure 16a) adapted to correspond with a rail or a pair of rails 25a on the crane chassis 25 in order to move the hoist 24 along the crane chassis 25.

The crane chassis 25 is rotatable connected to the crane beam structure 26. It is possible to perform a 360o rotation of the crane chassis 25 in the horizontal plane in relation to the beam structure 26. This is further illustrated in Figure 16a and 17c. The crane beam structure 26 is further movable arranged on a rail or a pair of rails 27. The crane beam structure 26 having rollers, sliding pads or slider (not shown) adapted to correspond with the rail or rails 27. The hoist/crane assembly 20 is thus allowed to move along the rail or rails 27. This movement is also indicated in the figure 16a and 17c. The movement of the hoist/crane assembly 24 and the rotation of the crane chassis 25 results in that the hoist crane assembly may follow an elliptic curve E in the horizontal plane at the underside of the cantilever structure 21 as shown in detail in the figure 17c.

As further shown in the figures 15-17e, the pair of rails 27 are arranged as a separate hoist/crane pair of rails 27 at the underside of the cantilever structure 21. The rails 27 are thus only intended for movement of the hoist/crane assembly 20 and not for the movement of the whole cantilevered structure 21 as they are situated a distance from the borders of the cantilever structure 21.

In the previous embodiments disclosed in figure 1-14, the cantilevered structure 1, 1A and the hoist/crane assembly C, CA are adapted to move along the same pair of rails 7. These are in the previous figures shown as integrated parts of the borders 7 arranged at the underside of the cantilevered structure 1, 1A.

When there is arranged a separate pair of hoist/crane rails 27, this will provide an easier retraction of the cantilevered structure 21 towards a platform deck of the jack up rig allowing a full retraction of the cantilevered structure 21. There is a space 29 between the platform deck 22 and the cantilever structure 21 in which the crane/hoist assembly 20 may be fitted, when the cantilever structure 21 is retracted over platform deck 22. The cantilever structure 21 may then be retracted over a perimeter structure P, PA (see figure 1 and 12) defining the edge of the platform deck 22 of the jack up rig 23 so that most of the cantilever structure 21 is situated above on the platform deck 22 in the retracted position.

In addition to a rotatable movement of the crane chassis 25, the chassis 25 may also be moved in the vertical direction in relation to the cantilever structure 21 or the crane beam structure 26. This vertical movement may be performed for instance by an hydraulic cylinder or a rotating lifting screw or by other suitable means.

Figure 16a shows the third embodiment where the crane chassis 25 are retracted in the vertical direction to a position near the crane beam structure 26. This position is suitable when the hoist crane 20 is in a resting position and the cantilever structure 21 is to be moved above the platform deck 22.

Figure 16b shows the third embodiment where the crane chassis 25 are extended in the vertical direction. The crane chassis 25 is in this position moved a distance away from the crane beam structure 26. As shown in the figures the crane chassis 25 is movable along a cylinder 26a as shown in the figure 16b.

This position is normally a working position as the hoist/crane assembly 20 are not hindered by obstacles 28 protruding from the underside of the cantilever structure 21 as indicated in figure 17b.

With reference to the numbers F1-F5 in figure 16a, the hoist/crane assembly 20 may perform five different movements as shown.

Figure 17a-17d is further illustrating examples of possible movements and positions of the crane assembly 20.

Figure 17a discloses a view from below of the hoist/crane assembly 20 in a possible resting position when the cantilever structure 21 is ready for retraction above the platform deck 22. In this position the hoist/crane assembly 20 is with its crane beam structure 26 arranged at one of the end positions of the pair of rails 27. The crane chassis 25 is in this position extending along the rails 27 towards the opposite end position of the rails 27. The hoist/crane assembly 20 is in this position completely covered at the underside of the cantilever structure 21 with no parts protruding out from the borders of the cantilever structure 21.

The crane chassis is in this position also retracted towards the cantilever structure 21 in order to fit in the space 29 between the platform deck and the cantilever structure 21 when the cantilever structure is extending over the jack up rig.

The figure 17b shows the same resting position viewed from the side.

Figure 17c-d discloses the hoist crane assembly 20 in possible working positions where the crane chassis 25 with the hoist 24 are lowered down from the cantilevered structure 21. The crane chassis 25 is adapted to rotate around a vertical center axis C extending through the center of the crane beam structure 26 as illustrated in figure 17b.

Figure 16b and 17c discloses a possible access for maintenance personnel to perform service on the hoist/crane assembly 20. There are arranged one or more hatches 30 at the underside of the cantilever structure 21. The hatches 30 are preferably arranged in the area above the pair of rails 27 or in connection with the pair of rails 27 in order to facilitate easy access to the hoist/crane assembly 20. In Figure 16a there is shown a ladder 31 where maintenance personnel may access to the hoist crane assembly 20 to perform maintenance on different parts of the crane assembly.

Figure 17d shows the crane assembly 20 in the working position.

Figure 18-20b shows a fourth embodiment of the hoist/crane assembly 40 to be attached on the cantilever structure 21. This embodiment differs from the third embodiment in a different beam structure 36 extending between the crane chassis 25 and the pair of rails 27. The remaining features are equal to the third embodiment.

A hoist/crane pair of rails 37 are also in this embodiment arranged separately from the pair of rails 7 in which the cantilever is moved. The orientation is perpendicular to the pair of rails 27 described in the third embodiment. The pair of rails 37 in the fourth embodiment are arranged parallel with the cantilever structure 21, in contrast to the pair of rails 27 of the third embodiment which are arranged transverse to the cantilever structure 21. The invention is however not restricted to these orientations of the pair of rails 27. Other positions and orientations are possible embodiments of the invention.

The beam structure 36 is illustrated in detail in the figure 19a and 19b. The beam structure 36 comprises a base part 36a and four legs 36b hingedly connected with the base part 36b. The hingedly connected legs 36b are adapted to rotate between a working position where the leg are arranged perpendicular to the base part 36a (shown in Figure 19a, 19b) and a resting position where the legs 36b are arranged in a plane parallel with the base part 36a (figure 20a, figure 20b). At least one of the legs may be attached to a piston arrangement 37 adapted to move the leg between the two positions. The figure 19a shows two piston arrangement 37, arranged respectively between the base part 36a and one of the legs 36b. The beam structure 36 may be moved by other means also within the ambit of the invention. At the other end of the legs 36b there are arranged beam rails 36c with rollers, sliding pads or sliders (not shown) adapted to move on the pair of rails 37 attached to the underside of the cantilever structure 21.The beam rails 36c are hingedly attach to two adjacent legs 36b together as shown in figure 19a.

Even though four legs 36b are disclosed the crane beam structure may have other designs, such as two separately arranged legs or plates replacing the four legs from the figure.

Figure 19a also illustrates the different possibility of movement of the hoist/crane assembly 40, illustrated by the numbers F1-F5.

Figure 19a and 19b discloses the hoist/crane assembly in a working position where the crane beam structure 36 is extended. In this position, the legs 36b are arranged perpendicular to the base structure 36a. The crane chassis 25 is thus moved further away from the underside of the cantilever structure 21.

The working position of the third embodiment shown in figure 16b corresponds to the working position of the fourth embodiment shown in Figure 19a-19b.

Figure 20a-b are illustrating examples of possible movement and positions of the hoist /crane assembly 40.

Figure 20a discloses a view from below, the hoist crane assembly 40 in a possible resting position when the cantilever structure21 is ready for retraction above the platform deck 22. In this position, the hoist crane assembly 40 is arranged with the legs 36b retracted towards the underside of the cantilever structure 21. No part of the hoist/crane assembly are protruding beyond the borders of the cantilever structure 21.

As shown in figure 20b by the arrow F6 the crane chassis 25 is slidable arranged in the beam structure 36. The crane chassis 25 is movable on rails 36d arranged in the beam structure 36. The moving direction is perpendicular of the moving direction of the crane beam structure 36 on the hoist/crane rails 37.

The resting position of the third embodiment shown in figure 16a corresponds to the resting position of the fourth embodiment shown in figure 20a-20b.

A possible access for maintenance personell to perform service on the hoist/crane assembly 20is by a separately arranged service carriage that are adapted to move on the same hoist crane pair of rails 37 as the hoist/crane assembly 40. (not shown)

Figure 21 shows a fifth embodiment with two hoist cranes arranged on the cantilever structure 21. These hoist/crane assemblies are equal to the hoist /crane assembly 20 as disclosed in the third embodiment and the hoist/ crane assembly 40 as disclosed in the fourth embodiment. Other combinations of the two hoist/crane assemblies 20, 40 are possible embodiments of the invention.

All the various aspects of the hoist 4 and crane beam 10 of the first embodiment and second embodiment can be adopted to the third, fourth and fifth embodiments of the hoist/crane assembly and as desired.

Claims

1. A cantilever structure (1; 1A, 21) for use in well intervention operations, which cantilever structure is arranged on a platform deck (2; 2A;22) of a jack-up rig/liftboat (3; 3A; 23), said cantilever structure (1; 1A; 21) being moveable relative to said platform deck (2; 2A; 22), one end (1a; 1Aa; 21a) of said cantilever structure (1; 1A; 21) being adapted to be retractably extended beyond the perimeter (P; PA; PA1) of said rig (3; 3A; 23) deck (2; 2A; 22), which cantilever structure end (1a; 1Aa; 21) carries a hoist adapted to manipulate loads (L) underneath said cantilever structure (1; 1A), characterized in that one or more hoists (4; 4A, 4B; 24) are arranged on a moveable crane chassis (5; 5A; 25) arranged underneath said cantilever structure (1; 1A; 21) on a crane beam structure (6; 6A; 26; 36), which crane chassis (5; 5A; 25) and said crane beam structure (6; 6A;26; 36) are moveable in a substantially horizontal plane by means of rollers or (R1, R2; RA;) or sliders driven on rails (7, 8; 7A; 27, 37) fixed to said cantilever structure (1; 1A; 21 ).

2. The cantilevered structure according to claim 1, characterized in that said rails (27, 37) are arranged at the underside of the cantilevered structure(21), separately arranged of a cantilever structure rails (7) said cantilever structure rails (7) are adapted to move the cantilever structure (21) relative the platform deck (22).

3. The cantilevered structure according to claim 1 or 2, characterized in that said crane chassis (25) are movable between a resting position where the crane beam structure (26, 36) is retracted to a position of the crane chassis (25) near the underside of the cantilever structure (21) and a working position where the crane beam structure (26, 36) is extended to a position of the crane chassis (25) a predermined distance away from the cantilever structure (21).

4. The cantilever structure according to any one of claim 1-3

characterized in that the crane beam structure (26, 36) is movable between the resting position and working position by a piston arrangement (37), an hydraulic cylinder or a rotating lifting screw (not shown).

5. The cantilever structure according to any one of claims 1-4, characterized in that the cantilever structure (21) comprises two hoist crane assembly (20, 40), each hoist crane assembly (20, 40) is movable on separately arranged rails (27, 37).

6. The cantilever structure according to any one of claims 1-5, characterized in that a hoist (24) is slidingly attached to the crane chassis (25).

7. The cantilever structure according to any one of claims 1-6, characterized in that the crane chassis (25) is rotatable attached to the crane beam structure (26, 36)

8. The cantilever structure according to any one of claim 1, 3-7 characterized in that said rails (7) are integrated with the borders of the cantilevered structure (1;1A) and corresponds to cantilever rails (7) adapted to be slidingly attached to the cantilever structure (1;1A).

9. The cantilever structure according to any one of claims 1-8, characterized in that said cantilever structure (1) comprises at least one hoist (4; 4A; 4B) arranged on a gantry crane beam structure (6; 6A) and beam-mounted crane chassis (5), said gantry crane beam structure (6) being moveable in a substantially horizontal plane in x and y directions, respectively, by means of rollers or sliders (R1, R2) driven on rails (7, 8) fixed to said cantilever structure (1) and gantry crane beam structure (6), respectively.

10. The cantilever structure according to any of the claims 1-9, characterized in that each hoist (4, 4’; 4A, 4B) running on a cantilevered crane beam (10, 10’; 10A) or a crane chassis (25) enables loads (L) to be delivered externally of said cantilever structure (1, 1A; 21) perimeter (P’, PA) and drilling rig perimeter (P).

11. The cantilever structure according to any of the claims 1-10, characterized in that said intervention operations is one or more among coiled tubing, wireline and well plugging operations.

Drawings

Priority

30.03.2017 NO 20170528

30.08.2017 NO 20171404

Patent classes

IPC classes

E02B 17/00

E21B 15/00

CPC classes

E02B 17/00

E21B 15/003

Citations

WO 2016/178576 A2 (A2)

Applicants, owners and inventors

Applicants

Dwellop AS

Postboks 296

4066 STAVANGER

NO (STAVANGER Municipality, Rogaland county)

Org. number: 912891542

Inventors

Jens Olav Myklebust

Dr Eyvin Dahlsgt 3

4011 STAVANGER

NO (STAVANGER Municipality, Rogaland county)

Agent

PROTECTOR IP AS

Pilestredet 33

0166 OSLO

NO (OSLO Municipality, Oslo county)

Org. number: 979409524

Reference: P5401NO00-AGI

Status history

Payment history

Oppositions and appeals

No oppositions or appeals

Administrative limitation

No administrative limitation

Liens and licences

No liens or licenses registered

Gazette entries

No Gazette entries found

Only events from 2024.03.04 and onwards are shown.

Cantilever structure with a hoist crane assembly