CN87105223A - Anchoring system of surface type ship for drilling - Google Patents
Anchoring system of surface type ship for drilling Download PDFInfo
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- CN87105223A CN87105223A CN87105223.7A CN87105223A CN87105223A CN 87105223 A CN87105223 A CN 87105223A CN 87105223 A CN87105223 A CN 87105223A CN 87105223 A CN87105223 A CN 87105223A
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- anchor
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- bower
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Abstract
For solving surface type ship for drilling under violent sea conditions, the sinking of toppling of forfeiture dynamic stability designs a new anchor and is.New anchor is to be made up of eight Bower Anchors and four groups of joiner shackles, and four Bower Anchors are arranged near the ship stern the fore and aft line, and four Bower Anchors are arranged near the ship stern the fore and aft line, and four groups of joiner shackles are located at the above side of a ship side position of draft extreme line.New anchor ties up to be laid and when freeing, all adopts the method that shifts stress point, therefore has the function of the former drilling well of protection.
Description
The present invention relates to and belong to ocean engineering, be particularly suitable for the anchor mooring positioning system of surface type ship for drilling about modern drilling ship aspect.
(1) prior art
Existing anchoring system of surface type ship for drilling (calling old anchor in the following text is) mainly contains: six point symmetry anchors system, eight point symmetry anchors system, ten point symmetry anchors system, 12 point symmetry anchor systems etc.
(1) composition and the setting of old anchor system
Old anchor is to be made up of six to 12 Bower Anchors, Bower Anchor setting aboard ship, remove the bower anchor and the aft anchor of six point symmetry anchors system, two bower anchors of eight point symmetry anchors system, the bower anchor and the aft anchor of ten point symmetry anchors system, two bower anchors of 12 point symmetry anchors system and two aft anchors are arranged near stem and the ship stern position the boats and ships fore and aft line, and other each anchor all is arranged on the side position of boats and ships.See accompanying drawing-1, main symmetrical anchor is a scheme drawing.Nomenclature:
(a) six point symmetry anchors system, (b) eight point symmetry anchors system,
(c) ten point symmetry anchors system, (d) 12 point symmetry anchors system,
(2) laying of old anchor system
Old anchor is to be to adopt the method for directly casting anchor to lay anchor system.
(3) old anchor system frees
When violent sea situation arrived, freeing that old anchor is was to have adopted anchor method, promptly six to 12 Bower Anchors all is recovered to initial position on the ship, withdraws the operation sea area.
(4) old anchor is the defective that exists
(a) under violent sea conditions, lose dynamic stability easily
Because most of Bower Anchors that old anchor is are arranged on side of a ship side position, directly dish out from topside during laying, form the topside riding anchor, under violent sea conditions, under the common influence of wave and anchor system, make drilling ship produce the wide-angle heel easily, and the sinking of toppling of forfeiture dynamic stability.
(b) free difficulty
Freeing that old anchor is is to have adopted anchor method, but the Bower Anchor weight of drilling ship is bigger, the Bower Anchor of surface type ship for drilling for example, every weight is: 13.6 tons, the Bower Anchor of semi-submersible drilling ship, every weight is: 20.0 tons, big like this weight, the anchor that quantity is many again is recovered to the initial position, is difficulty and need the long period, under violent sea situation has come the situation in sea area, weighing anchor, to free will be arduous and dangerous.
(c) lose former drilling well and probing achievement, cause great economic loss.
Because old anchor is to be to adopt the method for weighing anchor and freeing, and does not have the function of the former drilling well of protection again,, cause great economic loss so after freeing, must lose former drilling well and probing achievement.
Drilling ship is often for fear of because of losing former drilling well and probing heavy economic losses that achievement caused, affected adversely and freed in advance the opportunity of withdrawing the operation sea area, when violent sea situation has come the sea area, free and be arduous and dangerous, this also is a topple major reason of sinking of drilling ship forfeiture dynamic stability.
In order to overcome the above defective that old anchor system exists, with reference to prior art and following relevant document:
(1) ABS " the offshore drilling ship is built and classification rules 1980 ".
(2) University Of Tianjin's ocean engineering is built teaching and research room " to want oil to the ocean ".
(3) " wave, anchor system stablize with drilling ship " beam uncle Yu 1984.
Special proposition the present invention.
(2) purpose of the present invention and content
The objective of the invention is to overcome under violent sea conditions,, cause under the combined action of wave and anchor system, make drilling ship produce the heel of wide-angle, lose dynamic stability and the problem of the sinking of toppling because the design of anchor system is unreasonable.Change the anchor system design of surface type ship for drilling, set up the anchor mooring positioning system (calling new anchor in the following text is) of a new anchor system-transferable stress point.
The new anchor that arrives involved in the present invention is, be to specialize in surface type ship for drilling to use, according to present surface type ship for drilling structure and old anchor system situation is set, during the operation of surface type ship for drilling floading condition, be subjected to the restraint condition of anchor system, consult accompanying drawing-2, be subjected to the situation of anchor system constraint during the operation of surface type ship for drilling floading condition.
When violent sea situation occurs, as a certain side of a ship of drilling ship when stressed, wave heave power and anchor are the common huge momentum that produces of constrained force, be enough to make the anchor chain of the stressed side of a ship disrumpent feelings, be under the combined action of anchor chain of another side of a ship at stormy waves and anchor, make the heel of surface type ship for drilling to a wide-angle of another side of a ship (the non-stress side of a ship) generation, consult accompanying drawing-3, surface type ship for drilling is to the situation of another side of a ship canting.When this situation occurring, the curve of dynamical stability of surface type ship for drilling will change, and consult accompanying drawing-4, and the surface type ship for drilling curve of dynamical stability changes scheme drawing.
When surface type ship for drilling top-ups:
Area (A+B) 〉=1.4 area (B+C)
Area (A)＞area (C)
Surface type ship for drilling has enough dynamic stabilities.
When surface type ship for drilling under the combined action of wave and anchor system, when producing the heel of a wide-angle, will occur:
Area (C)＞area (A)
Surface type ship for drilling forfeiture dynamic stability, the sinking of toppling.
Because of surface type ship for drilling is the same with common ship, always captain (L) is more much bigger than the beam (B) again, for example the captain L=121.92 rice of Java Sea number (JAVA SEA); Molded breadth B=20.0 rice, its aspect ratio is:
L/B＝6.096
Therefore, its longitudinal metacenter (ML) is generally all much higher than boats and ships center of gravity (G), its righting moment be all the time on the occasion of, so when boats and ships generation casterangle, usually all be in stabilized conditions, promptly when surface type ship for drilling produced a casterangle, its curve of dynamical stability was difficult to occur:
Area (C)＞area (A)
Situation.Proposing new anchor according to above principle is:
(1) composition and the setting of anchor system newly
New anchor is to be made up of eight Bower Anchors and four groups of joiner shackles.Every weight of eight Bower Anchors is: 13.6 tons, and 23/4 inch of eight anchor chain: φ, 914 meters of length.Four groups with 3 inches of the joining wire hawser of joiner shackle: φ, 914 meters of length.
Four Bower Anchors of stem are arranged near the stem position of fore and aft line.Four Bower Anchors of ship stern are arranged near the ship stern position of fore and aft line.Topside appropriate location more than the draft extreme line, port and starboard respectively are provided with two groups of joiner shackles, establish two joiner shackles for every group, and the wire hawser rolling of joiner shackle is set up chain locker to avoid adopting anchor chain above deck.Consult accompanying drawing-5, new anchor is that scheme drawing is set.Nomenclature:
The M-windlass
-joiner shackle
The PA1-larboard first anchor PA2-larboard second anchor
PA3-larboard the 3rd anchor PA4-larboard the 4th anchor
The SA1-starboard first anchor SA2-starboard second anchor
SA3-starboard the 3rd anchor SA4-starboard the 4th anchor
(2) laying of anchor system newly,
Laying when new anchor ties up to the spitting drill well operations, be with two Bower Anchors of stem (being PA1 and SA1), being " V " type lays, larboard the 2nd, 3,4 anchors (being PA2, PA3, PA4) and starboard the 2nd, 3,4 anchors (being SA2, SA3, SA4), according to the situation in operation sea area, the specific requirement of operation, after being laid in the appropriate location, link to six roots of sensation wire hawser with four of the joiner shackle and the left and right side of a ship again, stress point is transferred to side of a ship side direction, be beneficial to needs adjustment location according to drilling well.Consult accompanying drawing-6, new anchor is to lay scheme drawing.
New anchor is to be made as by cloth: six point symmetry anchors system, eight point symmetry anchors system, eight anchors, ten point symmetry anchors system, eight anchors, 12 point symmetry anchors system.
(3) new anchor system frees
When violent sea situation occurred, new anchor system separated desorption method, is all stress points that in time anchor tied up to side of a ship side direction, transferred to the position (being near the fore and aft line the stem and the position of ship stern) of stem and ship stern.Its method of operation is to free with topside respectively to organize the joining joiner shackle of wire hawser.
At the come emergency situation in sea area of violent sea situation, come suddenly when freeing shackle, can adopt the method for four groups of wire hawsers that loosen joiner shackle, reach the purpose that shifts side of a ship side direction stress point, be an actv. expeditious measures.
When the situation particularly urgent, also can after loosen wire hawser, adopt to cut off simultaneously and respectively organize the emergency method of wire hawser, but will note safety of operation.This also is an actv. expeditious measures.
(4) new anchor cording has the function of the former drilling well of protection
When violent sea situation occurs and since new anchor system separate desorption method, be to adopt all stress points at side of a ship side direction, in time transfer to stem and ship stern, to avoid drilling ship to produce the heel of wide-angle, make drilling ship forfeiture dynamic stability, rather than adopt the method for weighing anchor and freeing.Therefore, after the transfer stress point was freed, newly the installation position of eight Bower Anchors of anchor system did not change, and after the length of suitable each anchor anchor chain of adjustment, can be set as four groups of " V " type anchor groups by cloth, and drilling ship can be maintained on the position of former drilling well.Consult accompanying drawing-7, new anchor is that the anchor behind the transfer stress point is the situation of change scheme drawing.At this moment, the drill outfit of drilling ship temporarily quits work, but still keeps connecting with drilling well, after violent sea situation is gone over, can readjust the location, can recover the drilling operation in former drilling well.
Only serious disastrous consequence occurring, making the situation that the generation of anchor system seriously drags of anchor or anchor chain is disrumpent feelings, just abandoning former drilling well, this just can reduce significantly because of losing drilling well and the loss of the probing tremendous economic that achievement caused.
In addition; because new anchor ties up to the function that has the former drilling well of protection when freeing; just can be because of being afraid of that losing drilling well causes heavy economic losses; and decidedly before violent sea situation comes; take the preventive freed in advance, drilling ship is more effectively prevented under violent sea conditions because of the sinking of toppling of forfeiture dynamic stability.
(3) the present invention has following advantage and good effect compared with prior art.
(1) new anchor is to free than being easier to
When violent sea situation occurred, the desorption method of separating of new anchor system was in time all stress points of side of a ship side direction, transfers on the position of stem and ship stern, only need free respectively to organize joiner shackle and get final product.Come the sea area in emergency circumstances in violent sea situation, adopted and loosen the wire hawser of respectively organizing joiner shackle, suitably tightened up the anchor chain of the left and right side of a ship 2,3,4 anchors, also can reach the purpose of freeing.Do not need to carry out the complicated operation of weighing anchor, therefore, new anchor system frees than old anchor system easily.
(2) new anchor cording has the function that adopts expeditious measures
When violent sea situation had come the sea area, old anchor system only taked the method for weighing anchor and freeing, and does not have other adaptation emergent.New anchor cording has the function that adopts expeditious measures, can adopt following expeditious measures:
(a) loosen the wire hawser of four groups of joiner shackles, suitably tighten up each anchor anchor chain, can reach the purpose of freeing that shifts each stress point of topside.
(b) under the situation of particularly urgent, new anchor is the method that can adopt the wire hawser that cuts off four groups of joiner shackles simultaneously, to reach the purpose of freeing rapidly.But note safety of operation.
(3) new anchor cording has the function of the former drilling well of protection.
Because the desorption method of separating that new anchor is is to adopt the stress point that shifts side of a ship side direction, rather than adopts the method for weighing anchor, so after freeing in good time, the installation position of eight Bower Anchors that new anchor is, do not change, after adjusting each length of chain cable, can form four groups of " V " type anchor groups, drilling ship is maintained on the position of former drilling well, drilling well temporarily quits work, and after violent sea situation is gone over, can readjust the location, recovery is in the drilling operation of former drilling well, to avoid losing drilling well.So just can reduce significantly because of losing drilling well and the probing heavy economic losses that achievement caused.
(4) new anchor is to adopt the preventive of freeing in advance.
Because new anchor cording has the function of the former drilling well of protection; needn't worry because of losing the heavy economic losses that drilling well causes; drilling ship just can be according to the information of meteorological ocean forecast like this; before violent sea situation does not have the sea area of coming; in time the stress point of side of a ship side direction; transfer to the stem stern and go, carry out the dead work of anti-stormy waves in advance, prevent that more effectively drilling ship is because of the sinking of toppling of forfeiture dynamic stability.
Old anchor is the function that does not have the former drilling well of protection; often lose the heavy economic losses that former drilling well causes because of misgivings; and affect adversely opportunity; when violent sea situation has come the sea area; weigh anchor and free and be very arduous and dangerous, this also is topple another major reason of sinking of drilling ship forfeiture dynamic stability.
Surface type ship for drilling of sinking with the wealth (comprising driling rig) that loses into more than hundred million dollars, is lost into hundred people's life, so the present invention has tangible economic benefit and social benefit because topple.
Claims (3)
1, a kind of anchoring system of surface type ship for drilling of being made up of Bower Anchor and shackle is characterized in that; New anchor is to be made up of eight Bower Anchors and four groups of shackles, and four Bower Anchors are arranged near the stem the fore and aft line, and four Bower Anchors are arranged near the ship stern the fore and aft line.Two groups of joiner shackles are respectively established in topside appropriate location more than the draft extreme line, port and starboard.Consult accompanying drawing-5.
2, the anchor mooring positioning system of being carried according to claim (), it is characterized in that: the laying that new anchor is, except that two stem anchors employings are directly cast anchor, other each anchor is after dishing out, all need to link with the joiner shackle of topside, stress point is transferred to side of a ship rear flank, and accompanying drawing-6 is consulted by recomposition anchor system.
3, the anchor mooring positioning system of being carried according to claim () is characterized in that: new anchor system separates desorption method, is to adopt in time all stress points of topside, transfers to the position of stem and ship stern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87105223.7A CN1005555B (en) | 1987-07-25 | 1987-07-25 | Anchoring system of surface type ship for drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87105223.7A CN1005555B (en) | 1987-07-25 | 1987-07-25 | Anchoring system of surface type ship for drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87105223A true CN87105223A (en) | 1988-03-16 |
| CN1005555B CN1005555B (en) | 1989-10-25 |
Family
ID=4815244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87105223.7A Expired CN1005555B (en) | 1987-07-25 | 1987-07-25 | Anchoring system of surface type ship for drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1005555B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129476A (en) * | 2014-06-30 | 2014-11-05 | 武汉船用机械有限责任公司 | Anchoring method and device for ship |
| EP3272636A4 (en) * | 2015-03-19 | 2018-10-24 | Samsung Heavy Industries Co., Ltd. | Semi-submersible maritime structure |
-
1987
- 1987-07-25 CN CN87105223.7A patent/CN1005555B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129476A (en) * | 2014-06-30 | 2014-11-05 | 武汉船用机械有限责任公司 | Anchoring method and device for ship |
| CN104129476B (en) * | 2014-06-30 | 2016-11-23 | 武汉船用机械有限责任公司 | The anchoring method of a kind of boats and ships and device |
| EP3272636A4 (en) * | 2015-03-19 | 2018-10-24 | Samsung Heavy Industries Co., Ltd. | Semi-submersible maritime structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1005555B (en) | 1989-10-25 |
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