CN114330029A - Method and system for determining optimal position of offshore drilling platform - Google Patents
Method and system for determining optimal position of offshore drilling platform Download PDFInfo
- Publication number
- CN114330029A CN114330029A CN202210119690.7A CN202210119690A CN114330029A CN 114330029 A CN114330029 A CN 114330029A CN 202210119690 A CN202210119690 A CN 202210119690A CN 114330029 A CN114330029 A CN 114330029A
- Authority
- CN
- China
- Prior art keywords
- riser
- marine
- angle
- inclinometer
- flexible joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses a method and a system for determining the optimal position of an offshore drilling platform, wherein the method comprises the following steps: acquiring current state information of the marine riser and current position information of the marine drilling platform, wherein the current state information comprises an upper flexible joint angle, a lower flexible joint angle, effective bottom tension, effective top tension and geometric stiffness coefficient; and determining the moving distance and the moving angle of the marine drilling platform according to the current state information of the marine riser and the current position information of the marine drilling platform. And when the marine drilling platform moves based on the moving distance and the moving angle, the upper flexible joint angle and the lower flexible joint angle of the marine riser reach the minimum. The system comprises two inclinometers arranged at the top of the marine riser and two inclinometers arranged at the bottom of the marine riser; the tensioner is arranged at the top end of the marine riser, and the blowout preventer is arranged at the bottom end of the marine riser; the blowout preventer is disposed on the seabed. The invention can minimize the upper flexible joint angle and the lower flexible joint angle of the riser, thereby improving the safety and the integrity of the riser.
Description
Technical Field
The application belongs to the field of marine oil and gas exploration and development, and particularly relates to a method and a system for determining an optimal position of a marine drilling platform.
Background
As a tie for connecting subsea wellheads to offshore drilling platforms, marine risers play an important role in isolating seawater, guiding drilling tools, circulating drilling fluids, compensating for heave motions of floating drilling units, and the like. No matter what floating system scheme is adopted for deep sea oil and gas exploitation, the marine riser is necessary equipment for ocean oil and gas exploitation and is one of weak and vulnerable components. Under the combined action of various loads such as vibration, drifting and fluctuation of ocean currents, waves and sea surface platforms, the marine riser in the deep water environment not only generates large offset, but also generates alternating stress, induces fatigue of the marine riser, reduces the service life of the marine riser, even breaks, causes secondary disasters and causes great loss to deep-sea oil development.
In order to ensure the safety and integrity of the marine riser during service, the inclination angle and the offset of the marine riser are monitored, and the state of the marine drilling platform deviating from a seabed wellhead can be known through the offset and the inclination angle so as to ensure that the marine drilling platform is in a safe range.
CN108729862B discloses a robust adaptive three-dimensional vibration suppression method for a marine flexible riser system, which includes: establishing a three-dimensional dynamic model of the marine flexible riser system; designing a robust adaptive boundary controller according to the three-dimensional dynamic model; wherein the three-dimensional dynamical model is used for analyzing the marine flexible riser system; obtaining real-time parameters of a marine flexible riser system; and sending a control command to the driving device according to the robust adaptive boundary controller and the real-time parameter so that the driving device applies acting force to the flexible riser to inhibit riser vibration. But the optimal position of the platform can not be optimized by measuring the angle and the position of the vertical inclination, so that the middle deformation of the marine riser is minimum, and the service life of the marine riser is prolonged.
Disclosure of Invention
The invention aims to provide a method and a system for determining the optimal position of an offshore drilling platform, which solve the safety and integrity of a marine riser and prolong the service life of the marine riser.
In order to solve the above technical problem, the present invention provides a method for determining an optimal position of an offshore drilling platform, comprising the steps of:
acquiring current state information of a marine riser and current position information of the marine drilling platform, wherein the current state information comprises an upper flexible joint angle, a lower flexible joint angle, effective bottom tension, effective top tension and geometric stiffness coefficients;
determining the moving distance and the moving angle of the marine drilling platform according to the current state information of the marine riser and the current position information of the marine drilling platform;
and when the marine drilling platform moves based on the moving distance and the moving angle, the upper flexible joint angle and the lower flexible joint angle of the marine riser reach the minimum.
Further, determining the moving distance and the moving angle of the marine drilling platform according to the current state information of the marine riser and the current position information of the marine drilling platform;
the calculation formula of the moving distance and the moving angle of the offshore drilling platform is as follows:
ue＝(ATWTWA)-1ATWTWΘ；
wherein, Deltau is the moving distance, xi is the moving angle, TbIs effective for marine riserBottom tension, TtIs the effective top tension of the riser, alphabIs the lower flexible joint angle, alpha, of the risertBeing the upper flexible pitch angle, Q, of the riserbIs the bottom shear force of the riser, QtIs the top shear force of the riser.
Δ X is the displacement in the X-axis direction, Δ Y is the displacement in the Y-axis direction, ueFor weighting equivalent offsets, A is a simplified matrix, W is a weighting matrix, theta is an upper and lower angle, ueTo be the equivalent offset vector, the offset vector,
is the inclined angle between the bottom and the ZX plane,
is the inclined angle between the bottom and the ZY plane,
is the inclined angle between the top and the ZX plane,
is the angle of inclination of the top with the ZY plane, xeIs equivalent displacement in the X-axis direction, yeIs equivalent displacement in Y-axis direction, xbIs a displacement in the direction of the bottom X axis, ybIs a displacement in the direction of the bottom Y axis, xtIs a top X-axis direction displacement, ytFor displacement in the direction of the top Y axis, gammabIs the included angle of the bottom offset vector and the X axis, gammatIs the included angle between the top offset vector and the X-axis, ubIs a bottom offset vector, utIs a top offset vector, ubfFor bottom displacement of the riser due to external loads, utfFor top displacement of the riser due to external loads, αboLower flexible joint angle, alpha, for riser top displacementtoUpper flexible joint angle, alpha, for riser top displacementbfLower flexible joint angle, alpha, for risers induced by side loadstfThe riser is given an upper flexible joint angle caused by side loading.
KTBeing geometric stiffness of the riser, Tti，TbiTop and bottom tension for riser section i, wiThe gravity of riser section i.
Furthermore, a first inclinometer and a second inclinometer are arranged at the top of the marine riser, and a third inclinometer and a fourth inclinometer are arranged at the bottom of the marine riser;
acquiring an upper flexible joint angle of the marine riser through the first inclinometer and the second inclinometer; and acquiring the lower flexible joint angle of the marine riser through the third inclinometer and the fourth inclinometer.
Further, with the bottom of riser is the origin of coordinates, establishes space rectangular coordinate system, space rectangular coordinate system's z axle perpendicular to the seabed, the plane that space rectangular coordinate system's x axle and y axle constitute is on a parallel with the seabed, the last flexible festival angle of riser does the top of riser with contained angle between the z axle, the lower flexible festival angle of riser does the bottom of riser with contained angle between the z axle.
Further, the top end of the riser is connected with the tensioner and is kept in a tensioning state;
acquiring effective top end tension of the marine riser through the tensioner;
and calculating the geometric stiffness coefficient of the riser according to the self characteristic and the mud characteristic of the riser.
A system for determining an optimal position of a marine drilling platform, comprising a riser connecting the marine drilling platform with a seabed, further comprising:
the acquisition module comprises a first inclinometer and a second inclinometer which are arranged at the top of the marine riser, and a third inclinometer and a fourth inclinometer which are arranged at the bottom of the marine riser; and a tensioner arranged at the top end of the marine riser and a blowout preventer arranged at the bottom end of the marine riser. The blowout preventer is disposed on the seabed.
Furthermore, the third inclinometer and the fourth inclinometer are in wireless communication connection with the hydrophone through the underwater beacon.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the current state information of the marine riser and the current position information of the marine drilling platform, the moving distance and the moving angle of the marine drilling platform are determined, so that the upper flexible joint angle and the lower flexible joint angle of the marine riser are minimized, and the safety and the integrity of the marine riser are improved.
2. According to the invention, the inclination angle and the inclination position of the riser are measured through the inclinometer and the tensioner, and the optimal position of the platform is optimized, so that the riser is in an optimal state, the transverse shear force at the upper and lower joints is small, the middle deformation of the riser is minimum, the transverse stress received by the riser is minimum, and the service life of the riser is prolonged.
3. The underwater two inclinometers, the third inclinometer and the fourth inclinometer are in wireless communication with the hydrophone directly through the underwater beacon and transmit data. This wireless connection mode and conventional wired mode and surface of water communication, perhaps use wired communication between two inclinometers under water, then compare the difference between the two through the mode of wireless uploading, it is simple convenient to install, improves the operating efficiency. The underwater signals are transmitted to the hydrophones on the water surface through the beacons, data are transmitted through wireless communication, information is easy to obtain, and the method is easy to achieve.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic view of the position of the offshore drilling platform and the riser according to the invention.
FIG. 3 is a schematic diagram of the system of the present invention.
In the figure, 1, a marine drilling platform, 2, a marine riser, 3, a seabed, 4, a tensioner, 5, a first inclinometer, 6, a second inclinometer, 7, a third inclinometer, 8, a fourth inclinometer, 9, a blowout preventer and 10 compass.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other equivalent modifications which can be obtained by a person skilled in the art without making creative efforts based on the embodiments in the present application belong to the protection scope of the present application.
As shown in fig. 1, a method of determining an optimal position of an offshore drilling rig 1, comprising the steps of:
Wherein the current state information comprises an upper flexible joint angle, a lower flexible joint angle, effective bottom tension, effective top tension and geometric stiffness coefficients.
Specifically, a GPS device and a compass 10 are disposed on the marine drilling platform 1, and current position information of the marine drilling platform 1 can be acquired through the GPS device and the compass 10. A first inclinometer 5 and a second inclinometer 6 are installed at the top of the riser 2, and a third inclinometer 7 and a fourth inclinometer 8 are installed at the bottom of the riser 2; accordingly, the upper flexible joint angle of the riser 2 can be acquired by the first inclinometer 5 and the second inclinometer 6; and acquiring the lower flexible joint angle of the marine riser 2 through the third inclinometer 7 and the fourth inclinometer 8.
In this embodiment, the bottom end of the riser 2 is used as the origin of coordinates, a spatial rectangular coordinate system is established, a z axis of the spatial rectangular coordinate system is perpendicular to the seabed 3, a plane formed by an x axis and a y axis of the spatial rectangular coordinate system is parallel to the seabed 3, an upper flexible joint angle of the riser 2 is an included angle between the top end of the riser 2 and the z axis, and a lower flexible joint angle of the riser 2 is an included angle between the bottom end of the riser 2 and the z axis.
As shown in fig. 2, the top end of the riser 2 is connected to the tensioner 4 and is maintained in tension. In the vertical direction, the stress of the riser 2 includes: (1) the top end of the riser 2 is stressed and is equal to the tension of the top end tensioner 4; (2) the riser 2 is self-weight;
(3) the weight of the slurry; (4) the bottom end joint tension of the riser 2 is equal to the effective bottom end tension. The horizontal transverse forces applied by the riser 2 include sea currents. The stiffness of the riser 2 with various muds can be obtained by a supplier query. Accordingly, the effective tip tension of the riser 2 can be obtained by the tensioner 4 described above. The effective bottom tension is calculated by measuring the inclination angle between the riser 2 and the bottom blowout preventer 9 according to the real-time measurement of the tension of the top tensioner 4, the gravity of the riser 2 and the gravity of the slurry in the riser 2. The geometric stiffness coefficient of the riser 2 is calculated from the properties of the riser 2 itself and the properties of the mud.
102, determining the moving distance and the moving angle of the marine drilling platform 1 according to the current state information of the marine riser 2 and the current position information of the marine drilling platform 1; wherein, after the offshore drilling platform 1 moves based on the movement distance and the movement angle, the upper flexible joint angle and the lower flexible joint angle of the marine riser 2 reach the minimum.
Specifically, the moving distance and the moving angle of the offshore drilling platform 1 can be calculated according to the following formulas:
ue＝(ATWTWA)-1ATWTWΘ；
wherein, Deltau is the moving distance, xi is the moving angle, TbIs the effective bottom tension, T, of the riser 2tIs the effective top tension, alpha, of the riser 2bIs the lower flexible joint angle, alpha, of the riser 2tIs the upper flexible pitch angle, Q, of the riser 2bIs the bottom shear force, Q, of the riser 2tIs the partitionThe top shear force of the water pipe 2.
Δ X is the displacement in the X-axis direction, Δ Y is the displacement in the Y-axis direction, ueFor weighting equivalent offsets, A is a simplified matrix, W is a weighting matrix, theta is an upper and lower angle value, ueTo be the equivalent offset vector, the offset vector,
is the inclined angle between the bottom and the ZX plane,
is the inclined angle between the bottom and the ZY plane,
is the inclined angle between the top and the ZX plane,
is the angle of inclination of the top with the ZY plane, xeIs equivalent displacement in the X-axis direction, yeIs equivalent displacement in Y-axis direction, xbIs a displacement in the direction of the bottom X axis, ybIs a displacement in the direction of the bottom Y axis, xtIs a top X-axis direction displacement, ytFor displacement in the direction of the top Y axis, gammabIs the included angle of the bottom offset vector and the X axis, gammatIs the included angle between the top offset vector and the X-axis, ubIs a bottom offset vector, utIs a top offset vector, ubfFor bottom displacement of the riser 2 caused by external loads, utfFor top displacement of the riser 2 caused by external loads, αboLower flexible joint angle, alpha, caused by displacement of the top of the riser 2toUpper flexible joint angle, alpha, caused by displacement of the top of the riser 2bfFor the lower flexible joint angle, alpha, of the riser 2 caused by side loadstfAn upper flexible joint angle for the riser 2 caused by side loads.
KTBeing geometric stiffness of the riser, Tti，TbiTop and bottom tension for riser section i, wiThe gravity of riser section i.
According to the embodiment, the moving distance and the moving angle of the marine drilling platform 1 are determined according to the current state information of the marine riser 2 and the current position information of the marine drilling platform 1, so that the upper flexible joint angle and the lower flexible joint angle of the marine riser 2 are minimized, and the safety and the integrity of the marine riser 2 are improved.
As shown in fig. 3, a system for determining an optimal position of a marine drilling platform 1 comprises a riser 2 connecting the marine drilling platform 1 with a seabed 3, and further comprises:
the acquisition module 310 comprises a first inclinometer 5 and a second inclinometer 6 arranged at the top of the riser 2, and a third inclinometer 7 and a fourth inclinometer 8 arranged at the bottom of the riser; and a tensioner 4 arranged at the top end of the riser 2 and a blowout preventer 9 arranged at the bottom end. Acquiring an upper flexible joint angle of the marine riser 2 through the first inclinometer 5 and the second inclinometer 6;
and acquiring the lower flexible joint angle of the marine riser 2 through the third inclinometer 7 and the fourth inclinometer 8.
And the third inclinometer 7 and the fourth inclinometer 8 are in wireless communication connection with the hydrophones through underwater beacons.
The top end of the riser 2 is connected with a tensioner 4 and is kept in a tensioning state; by means of the tensioner 4, the effective top end tension of the riser 2 is obtained. And a blowout preventer is arranged at the bottom end of the riser 2. The blowout preventer 9 is arranged on the seabed 3.
The determining module 320 is a computer capable of calculating a moving distance and a moving angle, and is configured to determine the moving distance and the moving angle of the offshore drilling platform 1 according to the current state information of the marine riser 2 and the current position information of the offshore drilling platform 1.
The installation method of the underwater two inclinometer wireless communication is simple and convenient, information is easy to obtain and easy to realize, and equipment configuration of the existing monitoring system, such as a flow meter, a strain sensor, a communication line or a wireless underwater sound beacon, is reduced.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, the present embodiments are not limited to the above embodiments, which are merely illustrative and not restrictive, and those skilled in the art can now make various changes and modifications without departing from the spirit and scope of the present invention.
Claims (7)
1. A method of determining an optimal position of an offshore drilling rig, comprising the steps of:
acquiring current state information of a marine riser and current position information of the marine drilling platform, wherein the current state information comprises an upper flexible joint angle, a lower flexible joint angle, effective bottom tension, effective top tension and geometric stiffness coefficients;
determining the moving distance and the moving angle of the marine drilling platform according to the current state information of the marine riser and the current position information of the marine drilling platform;
and when the marine drilling platform moves based on the moving distance and the moving angle, the upper flexible joint angle and the lower flexible joint angle of the marine riser reach the minimum.
2. The method of claim 1, wherein the distance and angle of the offshore drilling rig are determined based on current state information of the riser and current position information of the offshore drilling rig;
the calculation formula of the moving distance and the moving angle of the offshore drilling platform is as follows:
ue＝(ATWTWA)-1ATWTWΘ；
wherein, Deltau is the moving distance, xi is the moving angle, TbIs the partitionEffective bottom tension of water pipe, TtIs the effective top tension, alpha, of the riserbIs the lower flexible joint angle, alpha, of the risertIs the upper flexible pitch angle, Q, of the riserbIs the bottom shear force of the riser, QtIs the top shear force of the riser;
Δ X is the displacement in the X-axis direction, Δ Y is the displacement in the Y-axis direction, ueFor weighting equivalent offsets, A is a simplified matrix, W is a weighting matrix, theta is an upper and lower angle, ueTo be the equivalent offset vector, the offset vector,
is the inclined angle between the bottom and the ZX plane,
is the inclined angle between the bottom and the ZY plane,
is the inclined angle between the top and the ZX plane,
is the angle of inclination of the top with the ZY plane, xeIs equivalent displacement in the X-axis direction, yeIs equivalent displacement in Y-axis direction, xbIs a displacement in the direction of the bottom X axis, ybIs a displacement in the direction of the bottom Y axis, xtIs a top X-axis direction displacement, ytFor displacement in the direction of the top Y axis, gammabIs the included angle of the bottom offset vector and the X axis, gammatIs the included angle between the top offset vector and the X-axis, ubIs a bottom offset vector, utIs a top offset vector, ubfFor bottom displacement of the riser due to external load, utfFor top displacement of the riser due to external load, αboLower flexible joint angle, alpha, caused by displacement of the riser toptoUpper flexible joint angle, alpha, caused by displacement of the riser topbfFor the lower flexible joint angle of the riser caused by side loads,αtfan upper flexible joint angle caused by lateral loading of the riser;
KTbeing geometric stiffness of the riser, Tti，TbiTop and bottom tension for riser section i, wiThe gravity of riser section i.
3. The method of determining the optimal position of an offshore drilling rig according to claim 1, wherein the riser is provided with a first inclinometer and a second inclinometer on top and a third inclinometer and a fourth inclinometer on bottom;
acquiring an upper flexible joint angle of the marine riser through the first inclinometer and the second inclinometer; and acquiring the lower flexible joint angle of the marine riser through the third inclinometer and the fourth inclinometer.
4. The method of claim 3, wherein a spatial rectangular coordinate system is established with the bottom of the riser as the origin of coordinates, wherein the z-axis of the spatial rectangular coordinate system is perpendicular to the seabed, wherein the plane formed by the x-axis and the y-axis of the spatial rectangular coordinate system is parallel to the seabed, wherein the upper flexible joint angle of the riser is the angle between the top of the riser and the z-axis, and wherein the lower flexible joint angle of the riser is the angle between the bottom of the riser and the z-axis.
5. The method of determining the optimal position of a marine drilling platform according to claim 1, wherein the top end of the riser is connected to a tensioner and is maintained in tension;
acquiring effective top end tension of the marine riser through the tensioner;
and calculating the geometric stiffness coefficient of the riser according to the self characteristic and the mud characteristic of the riser.
6. A system for determining an optimal position of a marine drilling platform, comprising a riser connecting the marine drilling platform with a seabed, characterized in that it further comprises:
the acquisition module comprises a first inclinometer and a second inclinometer which are arranged at the top of the marine riser, and a third inclinometer and a fourth inclinometer which are arranged at the bottom of the marine riser; the tensioner is arranged at the top end of the marine riser, and the blowout preventer is arranged at the bottom end of the marine riser; the blowout preventer is disposed on the seabed.
7. The system for determining the optimal position of an offshore drilling rig according to claim 6, wherein: and the third inclinometer and the fourth inclinometer are in wireless communication connection with the hydrophone through underwater beacons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119690.7A CN114330029A (en) | 2022-02-08 | 2022-02-08 | Method and system for determining optimal position of offshore drilling platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119690.7A CN114330029A (en) | 2022-02-08 | 2022-02-08 | Method and system for determining optimal position of offshore drilling platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114330029A true CN114330029A (en) | 2022-04-12 |
Family
ID=81031431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210119690.7A Pending CN114330029A (en) | 2022-02-08 | 2022-02-08 | Method and system for determining optimal position of offshore drilling platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114330029A (en) |
-
2022
- 2022-02-08 CN CN202210119690.7A patent/CN114330029A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7328741B2 (en) | System for sensing riser motion | |
| US7080689B2 (en) | Instrumentation assembly for an offshore riser | |
| CA2992984C (en) | Monitoring system and method for vessel mooring | |
| KR20130114513A (en) | Static and dynamic positioning system and method using real time mooring line monitering | |
| US20230415854A1 (en) | Monitoring system and method for vessel mooring with position and yaw, roll, and pitch rotational motion | |
| CN114330029A (en) | Method and system for determining optimal position of offshore drilling platform | |
| Reinås et al. | Wellhead fatigue analysis method: A new boundary condition modelling of lateral cement support in local wellhead models | |
| Bian et al. | Manage tensioner stroke for dry tree semisubmersibles | |
| US10329893B2 (en) | Assembly and method for dynamic, heave-induced load measurement | |
| Arvani et al. | Dynamic model of a mobile offshore drilling unit in deep water environments for drilling simulation | |
| Buberg | Design and analysis of steel catenary riser systems for deep waters | |
| Denison et al. | A comprehensive approach to deepwater marine riser management | |
| Gustad et al. | A Reactive Flex Joint System for Reducing Wellhead Fatigue: Analysis and Measurement | |
| King et al. | The instrumentation of the conductor of a subsea well in the North Sea to measure the installed conditions and behavior under load | |
| Heuze et al. | A 4,000-foot riser | |
| Ruf et al. | The growing use of structural monitoring as part of wellhead and conductor integrity management | |
| Denison et al. | A comprehensive approach to deepwater marine riser management | |
| Zimmermann et al. | Greater Plutonio Riser Tower Installation: Studies and Lessons Learnt | |
| Claro et al. | Hydrodynamic behavior of an ultra-deep water decoupled buoy supporting risers | |
| Moraes Alves et al. | TLP: A Dry Tree Solution for Pre-Salt in Santos Basin | |
| Shen et al. | Conductor system fatigue excitation and mitigation | |
| GB2586948A (en) | Riser monitoring using distributed sensing | |
| Jiang et al. | Integrated Monitoring and Advisory System Design for a Submerged Soft Yoke Moored FPSO | |
| Luppi et al. | Hybrid'S'Riser (HySR {sup TM}) designed and tested for deep waters | |
| Engebretsen et al. | TLP Operational Experience Enhancing Margins In-field as well as New Design |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |