CN114198569B - Underwater connection method of dynamic flexible pipe cable and anchoring base - Google Patents
Underwater connection method of dynamic flexible pipe cable and anchoring base Download PDFInfo
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- CN114198569B CN114198569B CN202111516165.0A CN202111516165A CN114198569B CN 114198569 B CN114198569 B CN 114198569B CN 202111516165 A CN202111516165 A CN 202111516165A CN 114198569 B CN114198569 B CN 114198569B
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- temporary
- rigging
- attachment element
- flexible pipe
- dynamic flexible
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G11/00—Arrangements of electric cables or lines between relatively-movable parts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses an underwater connection method of a dynamic flexible pipe cable and an anchoring base, which comprises the following steps: s1, connecting a permanent anchoring rigging and a suspension rigging on an attachment element of a dynamic flexible pipe cable; s2, laying a dynamic flexible pipe cable underwater until the pipe section with the attachment element enters water, and hanging a first temporary counterweight connected with the hanging rigging below the attachment element under the action of gravity; s3, continuously lowering the dynamic flexible pipe cable until the first temporary counterweight is lowered on the seabed near the anchoring base; s4, the ship crane lowers the second temporary counterweight into the water to the vicinity of the attachment element, hangs the second temporary counterweight on the attachment element, and pulls the attachment element downwards to be close to the anchoring base under the action of gravity; s5, connecting the permanent anchoring rigging to a fastening point of the anchoring base. The underwater connection method of the dynamic flexible pipe cable and the anchoring base is simple, safe and reliable, and solves the operation problem of connecting the dynamic pipe cable with positive buoyancy to the anchoring base on the seabed.
Description
Technical Field
The invention relates to the technical field of underwater pipe cable installation, in particular to an underwater connection method of a dynamic flexible pipe cable and an anchoring base.
Background
In the development of deep water offshore oil, dynamic flexible pipe refers to oil and gas pipelines, cables, and umbilicals that connect subsea pipe terminals with floating offshore facilities (such as FPSOs). The wave configuration is one of the configurations commonly used for dynamic flexible tubing. The wave configuration is that on the dynamic pipe cable between the seabed mud-landing point and the sea surface floating facility, a floating body material ascending dynamic pipe cable is arranged on the pipe cable near one end of the mud-landing point to form an upward bending section in water, and the dynamic pipe cable between the upward bending section and the top forms a downward bending section through a counterweight material or the self weight of the pipe cable. Whether the dynamic pipe cable has an anchoring wave configuration near the mud landing point is divided into two forms of anchoring and non-anchoring. There is an anchored, wave-configured dynamic umbilical with an anchor rigging to anchor the dynamic umbilical to an anchor base on the seabed near the mud point of the dynamic umbilical. Therefore, to complete the connection of the dynamic pipe cable to the anchoring base, it is necessary to pull the dynamic pipe cable against the buoyancy of the upper bent section of the dynamic pipe cable, bring the anchoring connection element of the dynamic pipe cable and the anchoring base close to each other, and then connect the permanent anchoring rigging between the anchor point of the dynamic pipe cable and the anchoring base.
For the connection between the permanent anchoring rigging and the anchoring base of the dynamic umbilical, the methods currently used are: and arranging a winch on a laying ship, carrying out route steering on a winch wire rope through the sea floor, connecting the winch wire rope to a dynamic pipe cable anchoring point, and completing the connection of the permanent anchoring rigging in a mode that the winch pulls the dynamic pipe cable anchoring point downwards. However, the method has the problems that the arrangement of the routing and steering of the winch steel wire rope is difficult to realize, the existence of the winch steel wire rope limits the heading of a laying ship, and the like, so that the laying operation is affected, and the applicability is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing an underwater connection method of a dynamic flexible pipe cable and an anchoring base.
The technical scheme adopted for solving the technical problems is as follows: the underwater connection method of the dynamic flexible pipe cable and the anchoring base comprises the following steps:
s1, connecting a permanent anchoring rigging and a suspension rigging on an attachment element of a dynamic flexible pipe cable;
s2, the dynamic flexible pipe cable is laid underwater until the pipe section with the attachment element enters water, and a first temporary counterweight connected with the suspension rigging is suspended below the attachment element under the action of gravity;
s3, continuing to lower the dynamic flexible pipe cable until the first temporary counterweight is lowered on the seabed near the anchoring base, and temporarily anchoring the dynamic flexible pipe cable;
s4, lowering a second temporary counterweight into water by the ship crane, hanging the second temporary counterweight on the attachment element, and pulling the attachment element close to the anchoring base by the second temporary counterweight under the action of gravity;
and S5, connecting one end of the permanent anchoring rigging far away from the attachment element to a fastening point of the anchoring base, and completing underwater connection of the dynamic flexible pipe cable and the anchoring base.
Preferably, in step S1, on the laying vessel, one end of a permanent anchoring harness is connected to the attachment element of the dynamic flexible pipe cable; temporarily fixing the permanent anchor rigging axially on the dynamic flexible umbilical;
in step S5, the temporary fixing of the permanent anchor rigging on the dynamic flexible pipe is released, the permanent anchor rigging is pulled apart, and the end of the permanent anchor rigging remote from the attachment element is connected to the anchor point of the anchor base by an ROV.
Preferably, in step S1, one end of the suspension rig is connected to the attachment element, and the suspension rig is temporarily fixed to the attachment element after being folded;
in step S2, after the pipe section with the attachment element is put into water, the first temporary counterweight is hoisted into water through a ship crane; and connecting the other end of the suspension rigging to the first temporary counterweight under water, and releasing the connection between the ship crane and the first temporary counterweight.
Preferably, in step S1, one end of a suspension rig is connected to the attachment element and the other end of the suspension rig is connected to a first temporary counterweight;
the step S2 further includes: and placing the first temporary counterweight into water.
Preferably, in step S2, the dynamic flexible pipe cable portion above the attachment element is provided with a float, and the first temporary counterweight pulls the dynamic flexible pipe cable portion above the attachment element away from the hull structure under the force of gravity.
Preferably, in step S3, along with the depth of the dynamic flexible pipe, a third temporary counterweight is lowered into the water and connected in series with the first temporary counterweight, so that buoyancy caused by the float on the dynamic flexible pipe counteracts, and the dynamic flexible pipe is always far away from the hull structure in the process of lowering.
Preferably, in step S1, a branch rigging is connected to the suspension rigging;
in step S4, after the second temporary weight has been lowered in proximity of the attachment element, connecting the second temporary weight with the branch rigging by an ROV such that the second temporary weight is suspended from the attachment element; the marine crane continues to lower the second temporary counterweight to pull down the attachment element until a distance between the attachment element and the anchor base is less than a length of the permanent anchor rigging.
Preferably, the second temporary counterweight is landed on the seabed or suspended below the attachment element when the distance between the attachment element and the anchor base is less than the length of the permanent anchor rigging.
Preferably, the underwater connection method of the dynamic flexible pipe cable and the anchoring base further comprises the following steps:
s6, recycling the first temporary counter weight and the second temporary counter weight.
Preferably, step S6 includes:
s6.1, when the ship crane lifts the second temporary counterweight to the slackening of the rigging between the second temporary counterweight and the attachment element, untying the rigging by an ROV;
s6.2, the ship crane continuously lifts the second temporary counterweight and recovers the second temporary counterweight to the ship;
and S6.3, the ship crane continuously descends a hanging hook to enter water, the connection between the hanging rigging and the attachment element is released through an ROV, and after the first temporary counterweight is connected with the hanging hook, the first temporary counterweight is lifted and recovered to a ship.
According to the underwater connection method of the dynamic flexible pipe cable and the anchoring base, the temporary counterweight is hung on the dynamic flexible pipe cable to assist the connection of the permanent anchoring rigging and the anchoring base on the seabed, so that the operation is simple, safe and reliable, and the operation problem that the dynamic flexible pipe cable with positive buoyancy is connected to the anchoring base on the seabed is solved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic illustration of the process of attaching a permanent anchor rigging to an anchor base by an ROV according to the invention;
fig. 2 is a schematic view of the structure of the present invention after the permanent anchor rigging is attached to the anchor base.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The underwater connection method of the dynamic flexible pipe cable and the anchoring base is mainly applied to the laying process of the dynamic flexible pipe cable, and the dynamic flexible pipe cable and the anchoring base are connected underwater. When the dynamic flexible pipe cable is laid, one end of the dynamic flexible pipe cable is connected with a submarine pipe cable terminal, then the dynamic flexible pipe cable is laid on the seabed along a route, finally the dynamic flexible pipe cable is connected with an anchoring base of the seabed through a permanent anchoring rigging, and the other end of the dynamic flexible pipe cable is connected with a sea surface floating facility (such as an FPSO), so that the whole dynamic flexible pipe cable is laid.
Referring to fig. 1 and 2, a method for underwater connection of a dynamic flexible pipe cable to an anchor base according to an embodiment of the present invention may include the steps of:
s1, connecting the permanent anchor rigging 30 and the suspension rigging 40, respectively, to the attachment element 20 of the dynamic flexible umbilical 10.
Suspension rigging 40 is used for connection of first temporary weight 50.
In this step, on the laying vessel, the corresponding anchoring position on the dynamic flexible pipe line 10 is determined according to the position of the anchoring base 100 on the seabed, at which the attachment element (e.g. structural member such as an anchor clip) 20 is mounted. Further, one end of the permanent anchor rig 30 is connected with the attachment element 20.
Considering that the permanent anchoring harness 30 has a certain length and avoids the problem of floating under water or winding with the dynamic flexible pipe 10, the permanent anchoring harness 30 can be temporarily fixed on the dynamic flexible pipe 10 along the axial direction of the dynamic flexible pipe 10 by a binding belt or other structures; the permanent anchor rigging 30 can then be deployed by pulling the lashing strap apart by the ROV.
Wherein one end of the suspension rigging 40 can be connected to the attachment element 20 beforehand on the laying vessel. After the subsequent attachment element 20 is launched into water, the first temporary weight 50 is then connected under water to the suspension rigging 40. Alternatively, on a laying vessel, one end of the suspension rig 40 is connected to the attachment element 20 and the other end is connected to the first temporary counterweight 50 by means of a connection rig 51.
In addition, in order to facilitate the connection of the subsequent second temporary weights 60, the branch rigging 41 is connected to the suspension rigging 40 in advance.
S2, the dynamic flexible umbilical 10 is laid underwater until the pipe section with the attachment element 20 is immersed in water, the first temporary counterweight 50 being suspended under the attachment element 20 by gravity.
Wherein after the above-mentioned steps have been completed for the connection of the permanent anchor rigs 30, the dynamic flexible pipe 10 is continued to be lowered on the laying vessel, the pipe section with the attachment element 20 is also brought into the water therewith, the subsequent pipe section of the dynamic flexible pipe 10 (the dynamic flexible pipe section above the attachment element 20) is also continued to be brought into the water and a float (float block) is mounted thereon, the pipe section where the float is located being floated in the water under the buoyancy of the float.
When the first temporary weight 50 is connected under water, after the pipe section with the attachment element 20 is submerged to a certain depth (for example, but not limited to, the case of 80 meters in depth), the first temporary weight 50 is then suspended into the water by the ship crane 300. The other end of suspension rigging 40 remote from attachment element 20 is connected to first temporary weight 50 under water, and then ship crane 300 is disconnected from first temporary weight 50. The first temporary counterweight 50 is connected with the suspension rigging 40 primarily by a connection rig 51 thereon. In addition, in order to facilitate the connection of ROV200 by grabbing underwater, a hericium erinaceus fist is mounted at the connection end of connection rigging 51 and suspension rigging 40.
When the first temporary weight 50 has been connected to the suspension rigs 40 by means of the connection rigs 51 on the laying vessel, the first temporary weight 50 is also lowered into the water when the dynamic flexible pipe 10 is laid under water until the pipe section with the attachment element 20 is to be put into the water.
The first temporary counterweight 50 is suspended below the attachment element 20 by the connecting rigging 51 and the suspension rigging 40, and has a pull-down effect on the pipe section where the attachment element 20 is located under the action of gravity, so as to pull the dynamic flexible pipe upward bending section (pipe section where the float is located) after the attachment element 20 in a nearly plumb state against the buoyancy of the dynamic flexible pipe upward bending section 10 after the attachment element 20, thereby being far away from the hull structure and avoiding collision with the hull structure.
S3, continuing to lower the dynamic flexible pipe cable 10 until the first temporary counterweight 50 is lowered on the seabed near the anchoring base 100, and temporarily anchoring the dynamic flexible pipe cable 10.
The first temporary counterweight 50 is set based on the buoyancy consumed by the dynamic flexible umbilical 10 and the buoyancy brought by the float when the dynamic flexible umbilical 10 is lowered, so that the first temporary counterweight 50 is enough to pull down the dynamic flexible umbilical 10 under the action of gravity to avoid collision with the hull structure, and simultaneously, the first temporary counterweight 50 can be located on the seabed near the anchor base 100 as the dynamic flexible umbilical 10 is lowered and laid on the seabed.
With the first temporary weight 50 positioned on the seabed, the dynamic flexible umbilical 10 connected thereto is positioned under water, as well as the attachment element 20 above the anchor base.
For the landing position of the first temporary weight 50, the first temporary weight 50 may be laid down on the seabed near the anchor base 100 by controlling the ship's position or controlling the direction and position of the first temporary weight 50 using a ship's crane operation.
In addition, on a laying vessel, the dynamic flexible pipe 10 is lowered into the water after passing through a tensioner that provides a clamping force to clamp the dynamic flexible pipe 10. When the tensioner provides a clamping force large enough to bear the first temporary weight 50 of the dynamic flexible umbilical 10, but the weight of the first temporary weight 50 is insufficient to cancel the buoyancy of the float in subsequent runs to control the dynamic flexible umbilical 10 not to collide with the hull structure vertically, one or more third temporary weights 70 can be lowered into the water and connected in series with the first temporary weight 50 when more floats are installed to the depth of the dynamic flexible umbilical 10, and the buoyancy caused by the floats on the dynamic flexible umbilical 10 is counteracted, so that the dynamic flexible umbilical 10 always keeps a plumb or nearly plumb state away from the hull structure during the lowering process, and the clamping force of the tensioner is not beyond the allowable value of the dynamic flexible umbilical 10. For the third temporary weights 70 requiring two or more, the third temporary weights 70 are sequentially lowered and sequentially connected to form a series structure with the first temporary weights 50 to ensure that the weight of the weights meets the requirements of dynamic flexible pipe cable design and the capability of the laying equipment. The temporary weights are also run in sequence as they are lowered onto the seabed.
And S4, the ship crane 300 lowers the second temporary counter weight 60 into the water to the vicinity of the attachment element 20, the second temporary counter weight 60 is hung on the attachment element 20, and the second temporary counter weight 60 pulls down the attachment element 20 close to the anchor base 100 through the gravity.
A tail rope is connected to the second temporary weight 60 before it is lowered. When the ship crane 300 lifts the second temporary counter weight 60 and lowers it into water, the worker can limit the shake of the second temporary counter weight 60 by pulling the tail rope; the tail rope is withdrawn after the second temporary weight 60 is placed in the water.
When the ship crane 300 lowers the second temporary weight 60 to a depth close to the attachment element 20, the ship crane 300 turns on the heave compensation mode. In heave compensation mode, the marine crane 300 continues to lower the second temporary counterweight 60.
After the second temporary weight 60 is lowered under water in the vicinity of the attachment element 20, the second temporary weight 60 is connected with the branch rigging 41 on the suspension rigging 40 by the ROV200 such that the second temporary weight 60 is suspended on the attachment element 20. The marine crane 300 continues to lower the second temporary counterweight 60 until it pulls down the attachment element 20 by gravity until the distance between the attachment element 20 and the anchor base 100 is less than the length of the permanent anchor rigging 30.
The second temporary counterweight 60 is connected with the branch rigging 41 mainly by a connection rigging 61 thereon. In addition, in order to facilitate the connection of ROV200 by grabbing underwater, a hericium erinaceus fist is mounted at the connection end of connection rigging 61.
After the connection rigging 61 of the second temporary weight 60 is connected to the suspension rigging 40 by the branch rigging 41, the length thereof lowered by the attachment element 20 is smaller than the length of the first temporary weight 50 lowered by the attachment element 20, whereby the connection of the dynamic flexible umbilical 10 to the anchor base 100 can be accomplished by the second temporary weight 60 pulling down the attachment element 20.
The second temporary weight 60 pulls down the attachment element 20 by gravity such that its distance from the anchor base 100 is less than the length of the permanent anchor rigging 30. When the distance between the attachment element 20 and the anchor base 100 is smaller than the length of the permanent anchor rigging 30, the second temporary weight 60 may be landed on the seabed or may be suspended below the attachment element 20, mainly depending on the weight of the second temporary weight 60 and the length of the connection rigging 61 thereon.
S5, connecting one end of the permanent anchoring rigging 30 far away from the attachment element 20 to the fastening point of the anchoring base 100, completing the underwater connection of the dynamic flexible pipe 10 and the anchoring base 100, and the connected state is shown in fig. 2.
Specifically, the temporary fixation of the permanent anchor rigging 30 to the dynamic flexible umbilical 10 may be released by ROV200, the permanent anchor rigging 30 pulled apart, and the end of the permanent anchor rigging 30 remote from the attachment element 20 connected (e.g., swaged) to the anchor point of the anchor base 100 by ROV 200.
S6, recovering the first temporary counter weight 50 and the second temporary counter weight 60.
In one embodiment, the step S6 may further include:
s6.1, when the ship crane 300 lifts the second temporary counter weight 60 to a slack state of the rigging (including the connection rigging 61, the branch rigging 41, and the suspension rigging 40) between the second temporary counter weight 60 and the attachment element 20, the rigging is released by the ROV 200. Specifically, the connection between the connection rigging 61 and the branch rigging 41 is released.
And S6.2, the ship crane 300 continues to lift and recycle the second temporary counter weight 60 to the ship, so that the second temporary counter weight 60 and the connecting rigging 61 connected with the second temporary counter weight 60 are recycled to the ship together.
S6.3, the ship crane 300 continues to lower the hook into the water, the suspension rigging 40 is disconnected from the attachment element 20 by the ROV200, and after the first temporary counterweight 50 is connected to the hook, the first temporary counterweight 50 is lifted and recovered to the ship.
Wherein structurally, the middle of suspension rigging 40 is configured as a disconnectable suspension component (such as a long handled ROV hook or ROV shackle) of ROV 200; to which a branch rig 41 is connected. When ROV200 disconnects suspension rigging 40 from attachment element 20, the suspension components of suspension rigging 40 are primarily disconnected, thereby disconnecting suspension rigging 40; the lower part of the suspension rigging (the part below the suspension element) remains connected to the connection rigging 51 and can be retrieved to the vessel together with the connection rigging 51 and the first temporary counterweight 50. The rigging part of the upper part of the suspension rigging is connected with the attachment element 20 by means of a shackle, which rigging part can be withdrawn and retrieved after disconnection of the suspension element; in the event that the attachment element 20 connection point space is limited, it is inconvenient for ROV200 to remove the shackle attached to attachment element 20, the shackle may remain on attachment element 20 if allowed.
The invention will be further described by way of example with respect to dynamic riser vertical laying.
The dynamic riser starts to be paved by taking the underwater end as a first end, when the anchoring point of the dynamic riser reaches the position above the moon pool cover of the ship, the ship pauses to be paved, and the anchoring clamp (namely the attachment element) of the dynamic riser is installed at the anchoring point. And two hanging rigging (including branch rigging) sections are respectively connected to the lifting lugs at the two sides of the anchoring clamp and are temporarily fixed. White paint is coated on hanging rings at the tail ends of the hanging rigging and the branch rigging at one side to distinguish the left hanging rigging and the right hanging rigging, and a permanent anchoring rigging is connected on a middle lifting lug of the anchoring clamp and is temporarily fixed.
The dynamic riser is laid continuously and one hoisting rig and two connecting rigs of temporary weights are prepared on the deck of the laying vessel in advance. The hoisting rigging must be long enough to ensure that the crane wire does not interfere with the shipboard when the shipboard crane on the shipboard side transfers temporary counterweights to the dynamic riser anchor clamps located in the vessel. The connecting rigging needs to be bound into a group to be temporarily fixed on the temporary counterweight. The long handled ROV hook attached to one end of the rigging is marked with white paint to distinguish between left and right hanging rigging.
The anchor clamps are paved to the designed depth, the ship is suspended from being paved, the ship crane lifts the first temporary counterweight to the depth where the anchor clamps are located, the ship crane starts a heave compensation mode, the ROV pulls the anchor clamps and the temporary fixing of the connecting rigging on the first temporary counterweight, and the connecting rigging is connected with the anchor clamps. The ship crane lowers the first temporary counter weight, the weight of the first temporary counter weight is transferred to the anchor clamp, the ROV unloads the lifting rigging of the first temporary counter weight, the ROV folds and connects the lifting rigging to the lifting hook of the ship crane, the lifting rigging is shortened in double, and accordingly the whole lifting rigging can be directly lifted on a ship deck within the lifting capacity range of the ship crane.
And continuously paving the dynamic vertical pipe, wherein the anchoring clamp on the dynamic vertical pipe reaches the design depth, and suspending a third temporary counterweight to the bottom of the first temporary counterweight by referring to the steps, wherein the two temporary counterweights are connected in series.
And continuously paving the dynamic vertical pipe, and sequentially dropping the third temporary counterweight and the first temporary counterweight onto the seabed, wherein the horizontal distance (layback) between the paving ship and the mud-landing point of the dynamic vertical pipe can be properly increased so as to ensure that the temporary counterweight is closer to an anchoring base of the dynamic vertical pipe when dropping onto the seabed. And continuing to lay the dynamic risers until the transfer of the dynamic risers to the FPSO tanker and the drawing of the dynamic risers in place on the tanker turret are completed. The dynamic riser forms a wave configuration in the water, the temporary counterweight forms a gravity foundation on the seabed, and the upward bending section with positive buoyancy of the dynamic riser on the upper part of the anchoring clamp is temporarily anchored near the anchoring base through a suspension rigging of the anchoring clamp for connecting the temporary counterweight and the dynamic riser.
The vessel is laid up to a distance of about 50 meters above the dynamic riser anchor base and to the side of the dynamic riser and not just above the anchor base to prevent the risk of falling objects. The connecting rigging is connected to the suspension point of the second temporary counterweight at the deck and is lashed into a mass temporarily secured to the second temporary counterweight. And a hoisting rigging connected between the hook head of the crane and the second temporary counterweight hoisting point. The total length of the connecting rigging of the second temporary counterweight is controlled to be shorter than that of the connecting rigging of the first temporary counterweight by a certain length, so that the second temporary counterweight does not need to be lowered to the seabed when the second temporary counterweight is lowered to complete the connection of the dynamic riser permanent anchoring rigging, and the anchoring base of the dynamic riser can be effectively prevented from being collided.
The ship crane lifts the second temporary counterweight into the water to the depth of the anchoring clamp of the dynamic riser, the crane heave compensation function is started, the side surface of the laying ship, which is routed from the dynamic riser, is close to the anchoring clamp, and the ROV is used for connecting the connecting rigging of the second temporary counterweight and the branch rigging on the hanging rigging.
The ship crane lowers the second temporary counterweight, the hoisting rigging of the second temporary counterweight should have enough length and use the soft sling, so that the crane lowers the second temporary counterweight, the soft sling contacts the dynamic vertical pipe, the lifting hook is ensured to be above the dynamic vertical pipe and not contacted with the dynamic vertical pipe, and the dynamic vertical pipe is ensured not to be damaged. The ROV follows the observation of the lowering of the second temporary counterweight, which pulls down the anchor clamps of the dynamic riser, pulls the permanent anchor rigging apart and pulls the end of the permanent anchor rigging to the anchor point location of the anchor base, takes care of the pulling route, avoids entanglement or interference with the suspension rigging, and then connects the permanent anchor rigging to the anchor point location of the anchor base.
The ship crane lifts the second temporary counterweight, the connecting rigging and the hanging rigging between the second temporary counterweight and the dynamic riser anchoring clamp are loosened, the permanent anchoring rigging pulls the anchoring clamp with force, and the ROV unloads the loosened connecting rigging.
The ship crane switches the heave compensation mode to a normal hoisting mode, recovers the second temporary counterweight to the ship deck, and the ROV unloads the loose suspension rigging, sorts the rigging of the first and third temporary counterweights on the sea floor, and the ship crane enters water and recovers the first and third temporary counterweights to the deck.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The underwater connection method of the dynamic flexible pipe cable and the anchoring base is characterized by comprising the following steps of:
s1, connecting a permanent anchoring rigging and a suspension rigging on an attachment element of a dynamic flexible pipe cable;
s2, the dynamic flexible pipe cable is laid underwater until the pipe section with the attachment element enters water, and a first temporary counterweight connected with the suspension rigging is suspended below the attachment element under the action of gravity;
s3, continuing to lower the dynamic flexible pipe cable until the first temporary counterweight is lowered on the seabed near the anchoring base, and temporarily anchoring the dynamic flexible pipe cable;
s4, lowering a second temporary counterweight into water by the ship crane, hanging the second temporary counterweight on the attachment element, and pulling the attachment element close to the anchoring base by the second temporary counterweight under the action of gravity;
and S5, connecting one end of the permanent anchoring rigging far away from the attachment element to a fastening point of the anchoring base, and completing underwater connection of the dynamic flexible pipe cable and the anchoring base.
2. The method of underwater connection of a dynamic flexible pipe line to an anchor base according to claim 1, characterized in that in step S1, on a laying vessel, one end of a permanent anchor rigging is connected to an attachment element of the dynamic flexible pipe line; temporarily fixing the permanent anchor rigging axially on the dynamic flexible umbilical;
in step S5, the temporary fixing of the permanent anchor rigging on the dynamic flexible pipe is released, the permanent anchor rigging is pulled apart, and the end of the permanent anchor rigging remote from the attachment element is connected to the anchor point of the anchor base by an ROV.
3. The underwater connection method of dynamic flexible pipe as claimed in claim 1, wherein in step S1, one end of a suspension rig is connected to the attachment element and the suspension rig is temporarily fixed to the attachment element after being folded;
in step S2, after the pipe section with the attachment element is put into water, the first temporary counterweight is hoisted into water through a ship crane; and connecting the other end of the suspension rigging to the first temporary counterweight under water, and releasing the connection between the ship crane and the first temporary counterweight.
4. The underwater connection method of dynamic flexible pipe as claimed in claim 1, wherein in step S1, one end of a suspension rig is connected to the attachment element and the other end of the suspension rig is connected to a first temporary counterweight;
the step S2 further includes: and placing the first temporary counterweight into water.
5. The method of underwater connection of a dynamic flexible pipe as claimed in claim 1, wherein in step S2 the dynamic flexible pipe portion above the attachment element is provided with a float and the first temporary counterweight pulls the dynamic flexible pipe portion above the attachment element away from the hull structure under the force of gravity.
6. The method of underwater connection of a dynamic flexible pipe and an anchor base according to claim 5, wherein in step S3, a third temporary counterweight is lowered into the water and connected in series with the first temporary counterweight along with the lowering depth of the dynamic flexible pipe, and the buoyancy caused by the float on the dynamic flexible pipe counteracts, so that the dynamic flexible pipe is always far away from the hull structure during the lowering process.
7. The method of underwater connection of a dynamic flexible pipe cable to an anchor base as in claim 1 wherein in step S1 a branch rigging is connected to the suspension rigging;
in step S4, after the second temporary weight has been lowered in proximity of the attachment element, connecting the second temporary weight with the branch rigging by an ROV such that the second temporary weight is suspended from the attachment element; the marine crane continues to lower the second temporary counterweight to pull down the attachment element until a distance between the attachment element and the anchor base is less than a length of the permanent anchor rigging.
8. The method of underwater connection of a dynamic flexible pipe line to an anchor base of claim 7, wherein the second temporary counterweight is landed on the seabed or suspended below the attachment element when the distance between the attachment element and the anchor base is less than the length of the permanent anchor rigging.
9. The method of underwater connection of a dynamic flexible pipe as claimed in any one of claims 1 to 8, wherein the method of underwater connection of a dynamic flexible pipe to an anchor base further comprises the steps of:
s6, recycling the first temporary counter weight and the second temporary counter weight.
10. The method of underwater connection of a dynamic flexible pipe cable to an anchor base of claim 9, wherein step S6 includes:
s6.1, when the ship crane lifts the second temporary counterweight to the slackening of the rigging between the second temporary counterweight and the attachment element, untying the rigging by an ROV;
s6.2, the ship crane continuously lifts the second temporary counterweight and recovers the second temporary counterweight to the ship;
and S6.3, the ship crane continuously descends a hanging hook to enter water, the connection between the hanging rigging and the attachment element is released through an ROV, and after the first temporary counterweight is connected with the hanging hook, the first temporary counterweight is lifted and recovered to a ship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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