CN106638525A - Mounting technology for pile legs and pile shoes of JU2000E type self-elevating drilling platform - Google Patents

Mounting technology for pile legs and pile shoes of JU2000E type self-elevating drilling platform Download PDF

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Publication number
CN106638525A
CN106638525A CN201610912037.0A CN201610912037A CN106638525A CN 106638525 A CN106638525 A CN 106638525A CN 201610912037 A CN201610912037 A CN 201610912037A CN 106638525 A CN106638525 A CN 106638525A
Authority
CN
China
Prior art keywords
shoe
pile
spud leg
paragraph
big riser
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
Application number
CN201610912037.0A
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Chinese (zh)
Inventor
吴正峰
沈鹏鹏
季秋兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nantong Zhenhua Heavy Equipment Manufacturing Co Ltd
Original Assignee
Nantong Zhenhua Heavy Equipment Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nantong Zhenhua Heavy Equipment Manufacturing Co Ltd filed Critical Nantong Zhenhua Heavy Equipment Manufacturing Co Ltd
Priority to CN201610912037.0A priority Critical patent/CN106638525A/en
Publication of CN106638525A publication Critical patent/CN106638525A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B17/00Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B17/00Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0039Methods for placing the offshore structure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B17/00Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056Platforms with supporting legs
    • E02B2017/006Platforms with supporting legs with lattice style supporting legs

Abstract

The invention relates to a mounting technology for pile legs and pile shoes of a JU2000E type self-elevating drilling platform. The first section of each pile leg and a broken plate of a big stand plate of a corresponding pile shoe are combined firstly, and then the first section of each pile leg is hoisted into a trunk subsection to be combined with a corresponding pile shoe subsection; the method for combining of the first section of each pile leg and the corresponding pile shoe comprises the following specific steps that the first sections of the pile legs are turned over, the broken plates B of the big stand plates of the pile shoes are installed, dispersedly-installed pipes at the combining positions of the pile legs and the pile shoes are arranged, and the first sections of the pile legs are hoisted into a trunk to be combined with the pile shoe subsections. The mounting technology for the pile legs and the pile shoes of the JU2000E type self-elevating drilling platform has the advantages that the original way that pile leg high-strength steel and the big stand plates of the pile shoes are combined is changed into the way that structures of the big stand plates in the pile shoes are combined, and the original way that the dispersedly-installed pipes at the combining positions of the pile legs and the pile shoes are welded in the narrow space of the trunk subsection is changed into the way that welding is conducted on an offshore platform, so that the construction environment is improved, the superior space condition is provided for welding, and the welding quality and working efficiency are improved.

Description

A kind of JU2000E types pile legs of self-elevating drilling platform and shoe mounting technique
Technical field
The present invention relates to a kind of ocean engineering and shipbuilding technical field, more particularly to a kind of JU2000E types jack up Drilling platform leg and shoe mounting technique.
Background technology
In Marine oil and gas resource development process, self-elevating drilling platform is mainly used in Oil/gas Well of prying into, it can also be used to beat Producing well, workover treatment, the drilling and producing platform in also can producing as early stage, the realization of these major functions depends on it The application of particular component such as spud leg, jacking system, locking device and cantilever beam etc..
Drilling machinery, power, equipment, accommodation and some liftable stakes are mounted with self-elevating drilling platform Bottom in lower limb, the shoe of spud leg bottom during drilling well, and platform then lifts away from sea certain altitude along spud leg;Platform is down to the water surface during displacement, Spud leg rises, and platform can be dragged it by tugboat and move on to new well location just as barge.Spud leg is the crucial portion of self-elevating drilling platform Position, when self-elevating drilling platform implements operation, need to pass through elevating mechanism by platform raising to sea above safe altitude, Then the pitching pile of spud leg is carried out, and whole platform is supported by shoe.
When at present pile legs of self-elevating drilling platform closes up with shoe, shoe segmentation is first positioned, and then main hull closes up, then hangs Dress spud leg first paragraph enters to enclose trap segmentation, with shoe segment folding, finally installs the pipe in bulk at spud leg shoe segment folding and dissipates Dress plate.
During being closed up using said method, shoe segmentation is first positioned, and spud leg first paragraph enters to enclose trap segmentation, with shoe point Section close up, its close up be enclose trap segmentation narrow space in carry out, spud leg is high strength steel, and construction environment is poor, be unfavorable for weld Connect, increased welding difficulty, reduce welding quality, extend the working time, have impact on spud leg and close up precision with shoe.
Therefore, it is badly in need of that a kind of construction environment of research and development is good, conveniently welds, close up high precision, welding quality and work can be improved The pile legs of self-elevating drilling platform for making efficiency is imperative with shoe folding method.Jing checks relevant document, does not find and this Bright same or analogous technical scheme.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of reduction of erection time, raising welding quality and work efficiency JU2000E types pile legs of self-elevating drilling platform and shoe segment folding method.
To solve above-mentioned technical problem, the technical scheme is that:A kind of JU2000E types pile legs of self-elevating drilling platform With shoe mounting technique, its innovative point is:Comprise the steps:
(1)First, the disconnected plate B of spud leg segmentation, shoe segmentation and the big riser of shoe is made respectively, and spud leg is divided into from bottom to top Some sections, lowermost end is spud leg first paragraph, has the disconnected plate A of the big riser of shoe on shoe first paragraph, the disconnected plate B of the big riser of the shoe The complete big riser of shoe is constituted with disconnected plate A, and the big riser B of shoe is the portion being connected with spud leg first paragraph on the big riser of shoe Point;
(2)Secondly, spud leg first paragraph plate B disconnected with the big riser of shoe closes up, and the pipe in bulk that place is closed up in spud leg shoe is installed to Position;
(3)Again, by spud leg first paragraph lift into enclose well segmentation with shoe segment folding.
Further, the step(2)Middle spud leg first paragraph closes up with the big riser of shoe and concretely comprises the following steps:In spud leg first The disconnected plate B of the big riser of section welded and installed shoe, the disconnected plate B welding sequences of the big riser of monolithic shoe are weldering side 2-3 roads first;Then carry on the back Face back chipping, mother metal whiting is polishing to, is welded to both sides weldering thick essentially identical;Last both sides totally six welder's symmetrical weldings.
Further, the step(2)In pipe in bulk include triatic stay, the first hound and the second hound, it is described Triatic stay is horizontally arranged between two spud legs, and one end of first hound and the second hound is welded on horizontal brace jointly A bit, and the other end is all upwardly extended at bar middle part, and is connected in upper level strut end, and two hounds are integrally in the shape of the letter V.
Further, the step(3)Middle spud leg first paragraph is lifted into the concrete step for enclosing well segmentation and shoe segment folding Suddenly it is:
(4)First, the surplus on the disconnected plate B of the big riser of mowing spud leg first paragraph;Repetition measurement shoe level≤3mm, the big riser of shoe with Ground line-transect deviation≤2mm;
(5)Secondly, spud leg first paragraph rack-plate is with the blind tooth bar abutment joint of shoe and welds, and is sequentially:A welder is arranged first Weldering side 2-3 roads;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Totally two welderings of last both sides Work symmetrical welding;
(6)Again, the disconnected plate B of the big riser of spud leg first paragraph is segmented big riser A welding with shoe, is sequentially:Three welderings are arranged first Work welds side 2-3 roads;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Last both sides totally six Welder's symmetrical welding.
It is an advantage of the current invention that:
(1)The disconnected plate of the big riser of spud leg first paragraph and shoe is closed up first, and by the pipe in bulk at spud leg and shoe segment folding Welding equipment in place, then again integral hoisting enter to enclose well segmentation with shoe be segmented closed up, by original spud leg high-strength steel and shoe Big riser closes up, and is changed to the big riser folding structures in shoe inside, and original spud leg shoe is closed up into place's pipe in bulk to enclose well segmentation narrow Welding equipment in little space, is changed to carry out welding equipment in maritime platform, improves construction environment, and for welding superior space bar is provided Part, improves welding quality and work efficiency.
(2)Spud leg first paragraph closes up with shoe and is carried out in five steps, and specially moulding bed arrangement, spud leg first paragraph stand up installation stake Break plate, the spud leg shoe of the big riser of boots closes up that place's pipe in bulk is installed, spud leg first paragraph is lifted into enclosing well and shoe segment folding, spud leg Strengthen gusset and install in the shoe place of closing up.Closing up for spud leg first paragraph and shoe can be completed by five step, this closes up step Simply, it is easy to operate, close up efficiency high, improve and close up quality and work efficiency.
(3)During welding, the big riser welding sequence of monolithic welds side 2-3 roads to arrange three welders first;Then the back side is clear Root, mother metal whiting is polishing to, is welded to both sides weldering thick essentially identical;Last both sides totally six welder's symmetrical weldings, welding sequence Adjustment, effective control welding deformation, improves welding quality and welding efficiency.
Description of the drawings
Fig. 1 is schematic diagram after JU2000E types pile legs of self-elevating drilling platform and shoe segment folding.
Fig. 2 is the big riser of shoe of a kind of JU2000E types pile legs of self-elevating drilling platform of the invention and shoe mounting technique Schematic diagram.
Fig. 3 be the spud leg of a kind of JU2000E types pile legs of self-elevating drilling platform of the invention and shoe mounting technique lift into Enclose the schematic diagram of trap.
Specific embodiment
The invention discloses a kind of JU2000E types pile legs of self-elevating drilling platform and shoe mounting technique, concrete steps are such as Under:
(1)First, spud leg segmentation, shoe segmentation 2 and the disconnected plate B31 of the big riser of shoe are made respectively, and spud leg is from bottom to top successively It is divided into some sections, lowermost end is spud leg first paragraph 1, there is the disconnected plate A of the big riser of shoe on shoe first paragraph 1, the big riser of shoe breaks Plate B31 and disconnected plate A constitutes the complete big riser 3 of shoe, and the big riser B of shoe is to connect with spud leg first paragraph 1 on the big riser 3 of shoe The part for connecing;
(2)Secondly, the plate B disconnected with the big riser of shoe of spud leg first paragraph 1 closes up, and first mowing spud leg first paragraph 1, shoe closes up place's stake Surplus on the disconnected plate B31 of the big riser of boots(Reserved 5mm surpluses, mowing when spud leg and shoe segment folding);Spud leg segmentation is turned over 90 ° of spud leg first paragraphs 1 of body stand up rear center's perpendicularity≤5mm;The ﹢ 3mm of 1 lower end triangle size of spud leg first paragraph 13106.4(Welding Amount of contraction);Then line determines the installation site of the disconnected plate B31 of the big riser of shoe and pipe in bulk, the disconnected plate B31 positioning of the big riser of shoe Perpendicularity≤3mm;By the disconnected plate B31 welding equipments of the big riser of shoe in place, welding sequence is to arrange three welders to weld side 2-3 first Road;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Totally six welders symmetrically apply for last both sides Weldering;Pipe welding equipment in bulk at last spud leg shoe segment folding;Pipe in bulk includes that triatic stay 42, the first hound 43 and second are oblique Strut 41, triatic stay 42 is horizontally arranged between two spud legs, and one end of the hound 41 of first hound 43 and second is total to It is same to be welded on the middle part of triatic stay 42 a bit, and the other end is all upwardly extended, and it is connected in upper level strut end, two diagonal braces Bar is integrally in the shape of the letter V;
(3)Again, by spud leg first paragraph 1 lift into enclose well segmentation it is 2-in-1 with shoe segmentation hold together, the front repetition measurement shoe level of lifting≤ 3mm, the big riser 3 of shoe and ground line-transect deviation≤2mm;Surplus on the disconnected plate B31 of the big riser of mowing spud leg first paragraph 1 first;Treat Lifting frame structure terminates with well segment folding is enclosed, lifting spud leg first paragraph 1 enter to be shortlisted for well segmentation it is 2-in-1 with shoe segmentation hold together, head The rack-plate of spud leg first paragraph 1 and the blind tooth bar abutment joint of shoe are first welded, welding sequence welds side 2-3 to arrange a welder first Road;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Totally two welders symmetrically apply for last both sides Weldering;Then weld the disconnected plate B31 of the big riser of spud leg first paragraph and be segmented big riser segmentation A welding with shoe, sequentially to arrange three first Name welder's weldering side 2-3 roads;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Last both sides are total to Six welder's symmetrical weldings.
Original spud leg high-strength steel is closed up with the big riser of shoe, the big riser folding structures in shoe inside are changed to, will be original Spud leg shoe is closed up place's pipe in bulk and is enclosing welding equipment in well segmentation narrow space, is changed to carry out welding equipment in maritime platform, is improved Construction environment, for welding superior steric requirements is provided, and improves welding quality and work efficiency.
The ultimate principle and principal character of the present invention has been shown and described above.It should be understood by those skilled in the art that, The present invention is not restricted to the described embodiments, merely illustrating the principles of the invention described in above-described embodiment and description, Without departing from the spirit and scope, the present invention also has various changes and modifications, and these changes and improvements all fall Enter in scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent thereof.

Claims (4)

1. a kind of JU2000E types pile legs of self-elevating drilling platform and shoe mounting technique, it is characterised in that:Comprise the steps:
(1)First, the disconnected plate B of spud leg segmentation, shoe segmentation and the big riser of shoe is made respectively, and spud leg is divided into from bottom to top Some sections, lowermost end is spud leg first paragraph, has the disconnected plate A of the big riser of shoe on shoe first paragraph, the disconnected plate B of the big riser of the shoe The complete big riser of shoe is constituted with disconnected plate A, and the big riser B of shoe is the portion being connected with spud leg first paragraph on the big riser of shoe Point;
(2)Secondly, spud leg first paragraph plate B disconnected with the big riser of shoe closes up, and the pipe in bulk that place is closed up in spud leg shoe is installed to Position;
(3)Again, by spud leg first paragraph lift into enclose well segmentation with shoe segment folding.
2. a kind of JU2000E types pile legs of self-elevating drilling platform according to claim 1 and shoe mounting technique, its feature It is:The step(2)Middle spud leg first paragraph closes up with the big riser of shoe and concretely comprises the following steps:In spud leg first paragraph welded and installed stake The disconnected plate B of the big riser of boots, the disconnected plate B welding sequences of the big riser of monolithic shoe are weldering side 2-3 roads first;Then back gouging, polishing To mother metal whiting, both sides weldering is welded to thick essentially identical;Last both sides totally six welder's symmetrical weldings.
3. a kind of JU2000E types pile legs of self-elevating drilling platform according to claim 1 and shoe mounting technique, its feature It is:The step(2)In pipe in bulk include triatic stay, the first hound and the second hound, the triatic stay level Between two spud legs, one end of first hound and the second hound is welded on triatic stay middle part a bit jointly, And the other end is all upwardly extended, and upper level strut end is connected in, two hounds are integrally in the shape of the letter V.
4. a kind of JU2000E types pile legs of self-elevating drilling platform according to claim 1 and shoe mounting technique, its feature It is:The step(3)Middle spud leg first paragraph lifted and concretely comprise the following steps with shoe segment folding into enclosing well and be segmented:
First, the surplus on the disconnected plate B of the big riser of mowing spud leg first paragraph;Repetition measurement shoe level≤3mm, the big riser of shoe and ground sample Line deviation≤2mm;
Secondly, spud leg first paragraph rack-plate is with the blind tooth bar abutment joint of shoe and welds, and is sequentially:Welder's weldering one is arranged first Side 2-3 roads;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Last both sides totally two welders couple Claim welding;
Again, the disconnected plate B of the big riser of spud leg first paragraph is segmented big riser A welding with shoe, is sequentially:Three welder's welderings are arranged first Side 2-3 roads;Then back gouging, be polishing to mother metal whiting, be welded to both sides weldering thick essentially identical;Last both sides totally six welders Symmetrical welding.
CN201610912037.0A 2016-10-20 2016-10-20 Mounting technology for pile legs and pile shoes of JU2000E type self-elevating drilling platform Pending CN106638525A (en)

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CN201610912037.0A CN106638525A (en) 2016-10-20 2016-10-20 Mounting technology for pile legs and pile shoes of JU2000E type self-elevating drilling platform
PCT/CN2017/102474 WO2018072582A1 (en) 2016-10-20 2017-09-20 Pile leg utilized in ju2000e self-elevating drilling platform, and method of installing pile shoe

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018072582A1 (en) * 2016-10-20 2018-04-26 南通振华重型装备制造有限公司 Pile leg utilized in ju2000e self-elevating drilling platform, and method of installing pile shoe

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936032A (en) * 1973-04-19 1976-02-03 Gewerkschaft Eisenhutte Westfalia Apparatus with a working platform and adjustable legs therefor
CN101745748A (en) * 2010-01-07 2010-06-23 招商局重工(深圳)有限公司 Method for welding pile leg and pile shoe of drill platform
CN103924566A (en) * 2014-05-06 2014-07-16 太重(天津)滨海重型机械有限公司 Self-elevating type drilling platform with one pile leg
CN103993591A (en) * 2014-05-20 2014-08-20 大连船舶重工集团海洋工程有限公司 Pile leg and pile shoe sealing method used when self-elevating drilling platform enters water
CN104929097A (en) * 2014-09-28 2015-09-23 南通振华重型装备制造有限公司 300-foot self-elevating drilling platform spud leg and shoe segmented carrying method
CN105040662A (en) * 2015-06-29 2015-11-11 上海外高桥造船有限公司 Folding method of pile legs and pile shoes of drilling platform
CN105178274A (en) * 2015-08-21 2015-12-23 上海外高桥造船有限公司 Constructing method for self-elevating platform
CN205440788U (en) * 2016-02-17 2016-08-10 上海外高桥造船有限公司 Connection structure of self -elevating drilling unit spud leg and shoe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828561A (en) * 1971-11-26 1974-08-13 Offshore Co Drilling platform
DE2938181A1 (en) * 1979-09-21 1981-04-09 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Offshore oil drilling platform - having automatically controlled water pumps in feed to extend legs to provide stable footing on uneven sea bed
CN105151222B (en) * 2015-09-21 2017-06-23 南通振华重型装备制造有限公司 A kind of jack up lifting platform mounting process
CN106638525A (en) * 2016-10-20 2017-05-10 南通振华重型装备制造有限公司 Mounting technology for pile legs and pile shoes of JU2000E type self-elevating drilling platform

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936032A (en) * 1973-04-19 1976-02-03 Gewerkschaft Eisenhutte Westfalia Apparatus with a working platform and adjustable legs therefor
CN101745748A (en) * 2010-01-07 2010-06-23 招商局重工(深圳)有限公司 Method for welding pile leg and pile shoe of drill platform
CN103924566A (en) * 2014-05-06 2014-07-16 太重(天津)滨海重型机械有限公司 Self-elevating type drilling platform with one pile leg
CN103993591A (en) * 2014-05-20 2014-08-20 大连船舶重工集团海洋工程有限公司 Pile leg and pile shoe sealing method used when self-elevating drilling platform enters water
CN104929097A (en) * 2014-09-28 2015-09-23 南通振华重型装备制造有限公司 300-foot self-elevating drilling platform spud leg and shoe segmented carrying method
CN105040662A (en) * 2015-06-29 2015-11-11 上海外高桥造船有限公司 Folding method of pile legs and pile shoes of drilling platform
CN105178274A (en) * 2015-08-21 2015-12-23 上海外高桥造船有限公司 Constructing method for self-elevating platform
CN205440788U (en) * 2016-02-17 2016-08-10 上海外高桥造船有限公司 Connection structure of self -elevating drilling unit spud leg and shoe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018072582A1 (en) * 2016-10-20 2018-04-26 南通振华重型装备制造有限公司 Pile leg utilized in ju2000e self-elevating drilling platform, and method of installing pile shoe

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Application publication date: 20170510