CN103955593A - Acquiring method for cantilever beam load spectrum of self-elevating drilling platform - Google Patents
Acquiring method for cantilever beam load spectrum of self-elevating drilling platform Download PDFInfo
- Publication number
- CN103955593A CN103955593A CN201310635275.8A CN201310635275A CN103955593A CN 103955593 A CN103955593 A CN 103955593A CN 201310635275 A CN201310635275 A CN 201310635275A CN 103955593 A CN103955593 A CN 103955593A
- Authority
- CN
- China
- Prior art keywords
- load
- girder
- semi
- equivalent beam
- equivalent
- 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
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an acquiring method for a cantilever beam load spectrum of a self-elevating drilling platform. The acquiring method comprises the following steps: performing equivalent treatment on a cantilever beam; confirming a boundary condition of an equivalent beam and allowed bending stress and allowed shearing strength of the equivalent beam; confirming the load distribution of the equivalent beam; calculating the reaction force, the bending stress and the shearing strength of an equivalent beam supporting base; assessing a drilling load endured by the equivalent beam; batching and drawing the cantilever beam load spectrum. The invention has the advantages that 1) a simplified acquiring method for the cantilever beam load spectrum of the self-elevating drilling platform is provided, the analysis workload is greatly reduced and the result is accurate and reliable, and 2) the acquiring method provided by the invention has wide applicability and universality.
Description
Technical field
The present invention relates to a kind of the obtaining of conceptual design, Basic Design, completion design and actual fininshing step semi-girder load of self-elevating drilling platform.
Background technology
Self-elevating drilling platform is one of marine four large portable piercing drills, because its station-keeping ability is strong and job stabilization is good, in the oil-gas exploration and development of continental shelf sea area, occupies critical role.The design-build of semi-girder platform, has promoted the operation function of self-elevating drilling platform greatly, and it can be realized and on production platform, implement brill/well-completion practice, workover treatment and brill/adjustment well operations.Due to cantilever beam structure and all more complicated of load, and whether normally the structural strength of semi-girder directly have influence on platform drilling operation, and therefore cantilever beam structure definite has important engineering significance.After self-elevating platform (SEP) pitching pile is stood, need make derrick center arrive well head center by the movement of semi-girder and rig floor, the distance that semi-girder stretches out and the offset distance of rig floor are not a fixing value, and position in actual job is a scatter diagram in region, the semi-girder load collection of illustrative plates (Load Chart) that namely we often say, platform well drilling can have hundreds and thousands of positions.The drilling well load total in each different position is different, and semi-girder stretches out far away, and it is larger that rig floor is offset, and drilling well load is less.Another complicated problem is load; Drilling well load is to be made up of hook load, load from rotary table, thribble load etc., thribble load is placed on rig floor, its center of gravity and the well heart have certain departing from, while having caused the skew of rig floor left and right, the size of drilling well load is different, does not just belong to drilling well load but to cantilever beam structure and the also restricted effect of drilling well load in the time that thribble is placed on semi-girder pipe holder.Measure if adopt, design and obtain in conjunction with finite element method, that needs the time of several months to complete.
Summary of the invention
For the problems referred to above, the invention provides a kind of acquisition methods of semi-girder load collection of illustrative plates, can obtain the maximum drilling well load that semi-girder can be placed when the operation of any point in the coverage of drilling well region, can obtain fast the drilling well load of certain job position, and the batch processing of programming, to obtain fast semi-girder load collection of illustrative plates, therefore the present invention can significantly improve semi-girder load collection of illustrative plates and establish the efficiency of painting, shorten design, the construction period of self-elevating platform (SEP), raise the efficiency.
In order to achieve the above object, the invention provides a kind of self-elevating drilling platform cantilever beam load collection of illustrative plates acquisition methods, it is characterized in that, comprise the steps:
1, carry out semi-girder equivalence:
According to the cantilever beam structure pattern of actual design and Entity measurement acquisition, obtain semi-girder section attribute, comprise section modulus and shear area;
2, permissible bending stress and the permitting stress of determining Equivalent Beam boundary condition and Equivalent Beam, comprise the steps:
B1) determine Equivalent Beam boundary condition according to the structural shape of semi-girder pedestal, be simplified to bearing, determine that end reaction is less than or equal to the maximum load capacity of semi-girder pedestal;
B2), according to the standard of American Iron and Steel Institute, determine permissible bending stress and the permitting stress of Equivalent Beam;
3, determine the load distribution of Equivalent Beam:
Need definite load to comprise: semi-girder load, rig floor are from heavy load, hook load, thribble load and pipe stockyard load; Wherein semi-girder load and pipe stockyard load are applied to Equivalent Beam with linear load, the fulcrum place that other load applyings contact with semi-girder to rig floor;
4, obtain Equivalent Beam bearing support reaction, bending stress and shear stress:
According to the equilibrium relation of force and moment, try to achieve the end reaction of Equivalent Beam, maximal bending moment and the maximum shear that Equivalent Beam is subject to;
5, the drilling well load that assessment Equivalent Beam can bear, draw semi-girder load collection of illustrative plates:
According to support reaction size, bending and shearing size, determine the maximum drilling well load that semi-girder can bear at certain job position;
Same method, the maximum drilling well load that each position, operating area that confirmation semi-girder can cover can bear.
Wherein, under optimal way, in described step 5, select computing machine to obtain all maximum drilling well load under the different operating modes in operating area that semi-girder can cover by batch processing mode.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention proposes a set of self-elevating drilling platform cantilever beam load collection of illustrative plates simplification acquisition methods that is applicable to, the method has greatly reduced analytical work amount compared with Finite Element Method, its result accurately and reliably 2, the present invention has applicability and versatility widely, not only be suitable for traditional semi-girder pattern, but also be applicable to Novel cantilever beam pattern.In sum, it is little that the present invention has workload, and the advantage that applicability is strong can be applicable to obtaining of self-elevating drilling platform cantilever beam load collection of illustrative plates.
Brief description of the drawings
Fig. 1 is Typical Cantilever structural profile.
Fig. 2 Equivalent Beam schematic diagram, shows the force-bearing situation of Segment equivalent beam.
The stressed schematic diagram of Fig. 3 Equivalent Beam, shows and simplifies semi-girder load and boundary condition.
Fig. 4 Equivalent Beam moment of flexure, shearing, bending stress and shear stress schematic diagram.
Fig. 5 semi-girder segmentation schematic diagram, shows section characteristic.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, the present invention includes following steps:
1, carry out semi-girder equivalence;
Semi-girder typical structure pattern as shown in Figure 1, is connected by transversary by two I-beams, taking larboard or starboard I-beam as research object, obtains its section attribute, is reduced to overhanging beam as shown in Figure 2.
In Fig. 1, left side is the basic structure pattern of semi-girder, two side portions is I-beam, upper part is that pipe stockyard load holds place, superstructure is mainly born the load in pipe stockyard, less to overall intensity contribution, therefore can ignore, an I-beam of getting in both sides is simplified as Equivalent Beam.
2, determine permissible bending stress and the permitting stress of Equivalent Beam boundary condition and Equivalent Beam;
Semi-girder relies on semi-girder base supports, determines semi-girder boundary condition according to the version of semi-girder pedestal, is reduced to hinged bearing.Because semi-girder I-beam size has exceeded the beam on ordinary meaning, therefore its bending stress allowable and permitting stress are determined according to the experimental formula of American Iron and Steel Institute.
3, determine that the load above Equivalent Beam distributes;
Load above semi-girder comprises semi-girder deadweight, rig floor deadweight, thribble load, pipe stockyard load and be positioned at the drilling well load of the well heart.Two parts before and after wherein semi-girder Equivalent Beam being divided into according to the architecture quality characteristic distributions of semi-girder, suppose that this two-part construction weight is uniformly distributed respectively along semi-girder direction.According to semi-girder entirety barycentric coordinates, the mass distribution of two parts semi-girder before and after obtaining according to force and moment balance; Pipe stockyard load and semi-girder deadweight are similar; Rig floor structure is connected by 4 bearings with semi-girder, therefore according to the weight distribution of rig floor, obtain the power of rig floor Gravitative Loads on semi-girder, due to the variation of drilling well position, rig floor will move in the upper left right avertence of semi-girder, and therefore corresponding change is also wanted in the distribution of rig floor deadweight.Thribble load is similar with the drilling well load and the rig floor deadweight that are positioned at the well heart.
4, obtain Equivalent Beam bearing support reaction, bending stress and shear stress;
Semi-girder is equivalent to overhanging beam as shown in Figure 3, by the load applying of step 3) to Equivalent Beam.
In Fig. 3: Push Up represents the hinged bearing that platform stern end group seat is simplified to; Hold Down represents the hinged bearing that platform front end pedestal is simplified to.
According to the equilibrium relation of force and moment, try to achieve the end reaction of Equivalent Beam, and the Equivalent Beam maximal bending moment and the maximum shear that are subject to.
R
push-up=R
aft+R
fwd+q
1×L
1+q
2×L
2+R
hold-down
F
shear=R
push-up-R
aft-R
fwd-q
1×L
1-q
2×(x+L
dis-L1)
Wherein:
R
push-upsemi-girder front end end reaction;
R
hold-dowsemi-girder rear end end reaction;
F
shearthe maximum shear that semi-girder is subject to;
The maximal bending moment that M semi-girder is subject to;
Q
1-semi-girder first half is from heavy load (containing pipe stockyard load);
Q
2-semi-girder latter half is from heavy load (containing pipe stockyard load);
L
1-semi-girder first half length (rig floor pivot distance);
L
2-semi-girder latter half length;
L
disdistance between-semi-girder pedestal;
The distance that x-semi-girder stretches out;
R
aftload on the deadweight of-rig floor and rig floor is in the load of rig floor front fulcrum;
R
fwdload on the deadweight of-rig floor and rig floor is in the load of rig floor rear fulcrum;
The bending and shearing figure being subject to according to the semi-girder Equivalent Beam that obtains result drafting, and stress diagram is as shown in Figure 4, wherein: Moment represents the moment of flexure that Equivalent Beam is subject to along its length, unit is N-mm;
Shear represents the shearing that Equivalent Beam is subject to along its length, and unit is N;
Bending Stress represents Equivalent Beam bending stress distribution along its length, and unit is N/mm
2;
Average Shear Stress represents Equivalent Beam shearing stress distribution along its length, and unit is N/mm
2;
The length that in figure, horizontal ordinate is semi-girder, ordinate is followed successively by from top to bottom: moment, shear value, bending stress value and average shear stress values.Dash area is the size of value, bending and shearing figure, and those skilled in the art can understand.
5, the drilling well load that assessment Equivalent Beam can bear, semi-girder load collection of illustrative plates is drawn in batch processing.
According to tried to achieve maximal bending moment and maximum shear, obtain maximum stress in bend and the maximum shear stress on Equivalent Beam, with step 2) Comparison of standards allowable, if be greater than permissible bending stress and permitting stress, reduce drilling well load and recalculate until stress is less than allowable value, intensity meets design requirement.Whether the maximum support reaction that then judgement is tried to achieve is less than the maximum load-carrying capacity of semi-girder pedestal, reduce if be not less than that drilling well load recalculates until support reaction is less than pedestal maximum load-carrying capacity, if the maximum drilling well load allowing that to meet drilling well load of above-mentioned two conditions be this job position simultaneously.
Use this method establishment stand-alone program " semi-girder load collection of illustrative plates " to realize the function of batch processing, automatic Iterative.
Taking certain self-elevating drilling platform as concrete case study on implementation, the inventive method is further detailed below.
1, according to cantilever beam structure pattern, semi-girder is divided into 5 sections as shown in Figure 5, obtains out respectively every section of semi-girder section attribute, the shear area and the section modulus that comprise beam interface are as shown in table 1.
| ? | Section modulus (m 3） | Shear area (m 2） |
| SPAN A (segmentation A) | 0.302 | 0.155 |
| SPAN B (segmentation B) | 0.377 | 0.153 |
| SPAN C (segmentation C) | 0.577 | 0.268 |
| SPAN D (segmentation D) | 0.464 | 0.179 |
| SPAN E (segmentation E) | 0.091 | 0.072 |
Table 1 Equivalent Beam section attribute
2, determine permissible bending stress and the permitting stress of Equivalent Beam boundary condition and Equivalent Beam;
Semi-girder pedestal Push up maximum load capacity (ton): 2300
Semi-girder pedestal Hold down maximum load capacity (ton): 900
Semi-girder permissible bending stress (MPa): 248
Semi-girder shear stress allowable (MPa): 180
3, determine the load distribution of Equivalent Beam;
Platform load input parameter is as shown in the table:
| Semi-girder deadweight (ton) | 659 |
| Cantilever deck-siding (rice) | 17 |
| Semi-girder longitudinal center of gravity (rice) | 18.6 |
| Semi-girder transverse center of gravity (rice) | 0.426 |
| Semi-girder first half length (rice) | 10.668 |
| Semi-girder latter half length (rice) | 27.332 |
| Semi-girder pipe stockyard load (ton) | 0 |
| Rig floor deadweight (ton) | 734 |
| Rig floor transverse center of gravity (rice) | -0.75 |
| Rig floor longitudinal center of gravity (rice) | 5.334 |
| Rig floor pivot distance (rice) | 10.668 |
| Thribble load (ton) | 0 |
| Thribble load transverse center of gravity (rice) | 2.56 |
| Thribble load longitudinal center of gravity (rice) | 5.334 |
| Equivalent Beam pedestal spacing (rice) | 14.5 |
Table 2 semi-girder load parameter and geometric parameter
4, obtain Equivalent Beam bearing support reaction, bending stress and shear stress;
Obtain end reaction, bending stress and shear stress according to load distribution and semi-girder geometric parameter
5, the drilling well load that assessment Equivalent Beam can bear, semi-girder load collection of illustrative plates is drawn in batch processing.
The drilling well load that the parameter evaluation semi-girder obtaining according to above step can bear, obtains semi-girder load collection of illustrative plates under certain operating mode as shown in table 3.
Certain operating mode Analysis of A Cantilever Beam Under load collection of illustrative plates of table 3
Wherein:
In table, overstriking numerical value in the left and right sides is the distance that semi-girder stretches out
In table, the first row overstriking numerical value is the distance of rig floor skew
Drilling well load unit in table is ton
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a self-elevating drilling platform cantilever beam load collection of illustrative plates acquisition methods, is characterized in that, comprises the steps:
A. carry out semi-girder equivalence:
According to the cantilever beam structure pattern of actual design and Entity measurement acquisition, obtain the section attribute of each position of semi-girder, comprise section modulus and shear area;
B. permissible bending stress and the permitting stress of determining Equivalent Beam boundary condition and Equivalent Beam, comprise the steps:
B1) determine Equivalent Beam boundary condition according to the structural shape of semi-girder pedestal, be simplified to bearing, determine that end reaction is less than or equal to the maximum load capacity of semi-girder pedestal;
B2), according to the standard of American Iron and Steel Institute, calculate permissible bending stress and the permitting stress of Equivalent Beam;
C. the load of determining Equivalent Beam distributes:
Need definite load to comprise: semi-girder load, rig floor are from heavy load, hook load, thribble load and pipe stockyard load; Wherein semi-girder load and pipe stockyard load are applied to Equivalent Beam with linear load, the fulcrum place that other load applyings contact with semi-girder to rig floor;
D. obtain Equivalent Beam bearing support reaction, bending stress and shear stress:
According to the equilibrium relation of force and moment, try to achieve the end reaction of Equivalent Beam, maximal bending moment and the maximum shear that Equivalent Beam is subject to;
E. assess the drilling well load that Equivalent Beam can bear, draw semi-girder load collection of illustrative plates:
According to support reaction size, bending and shearing size, determine the maximum drilling well load that semi-girder can bear at certain job position;
Same method, the maximum drilling well load that the operating area that confirmation semi-girder can cover can be born in place, different drilling wells position.
2. self-elevating drilling platform cantilever beam load collection of illustrative plates acquisition methods according to claim 1, it is characterized in that, in described step e, utilize computing machine to obtain all maximum drilling well load under the different operating modes in operating area that semi-girder can cover by automatic calculating batch processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310635275.8A CN103955593A (en) | 2013-11-29 | 2013-11-29 | Acquiring method for cantilever beam load spectrum of self-elevating drilling platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310635275.8A CN103955593A (en) | 2013-11-29 | 2013-11-29 | Acquiring method for cantilever beam load spectrum of self-elevating drilling platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103955593A true CN103955593A (en) | 2014-07-30 |
Family
ID=51332868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310635275.8A Pending CN103955593A (en) | 2013-11-29 | 2013-11-29 | Acquiring method for cantilever beam load spectrum of self-elevating drilling platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103955593A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255591A (en) * | 2017-05-31 | 2017-10-17 | 大连船舶重工集团有限公司 | A kind of test method for testing intensity of headframe |
| CN109684694A (en) * | 2018-12-12 | 2019-04-26 | 中国航空工业集团公司西安飞机设计研究所 | Freely-supported condition lower wall panels bear well-distributed pressure center equivalent stress appraisal procedure |
| CN112364457A (en) * | 2020-11-17 | 2021-02-12 | 一重集团大连工程技术有限公司 | Calculation method for saddles with different heights on two sides |
| CN114289791A (en) * | 2021-12-29 | 2022-04-08 | 东莞创响智能科技有限公司 | Ultrasonic cantilever beam cutting method |
-
2013
- 2013-11-29 CN CN201310635275.8A patent/CN103955593A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255591A (en) * | 2017-05-31 | 2017-10-17 | 大连船舶重工集团有限公司 | A kind of test method for testing intensity of headframe |
| CN109684694A (en) * | 2018-12-12 | 2019-04-26 | 中国航空工业集团公司西安飞机设计研究所 | Freely-supported condition lower wall panels bear well-distributed pressure center equivalent stress appraisal procedure |
| CN109684694B (en) * | 2018-12-12 | 2023-01-13 | 中国航空工业集团公司西安飞机设计研究所 | Method for evaluating equivalent stress of uniformly distributed pressure centers borne by wall plate under simply supported condition |
| CN112364457A (en) * | 2020-11-17 | 2021-02-12 | 一重集团大连工程技术有限公司 | Calculation method for saddles with different heights on two sides |
| CN112364457B (en) * | 2020-11-17 | 2024-04-23 | 一重集团大连工程技术有限公司 | Saddle calculation method for two sides with different heights |
| CN114289791A (en) * | 2021-12-29 | 2022-04-08 | 东莞创响智能科技有限公司 | Ultrasonic cantilever beam cutting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103955593A (en) | Acquiring method for cantilever beam load spectrum of self-elevating drilling platform | |
| RU2600518C2 (en) | Method and apparatus for measuring residual stresses in component | |
| CN100386237C (en) | Automobile structure lightweighting design method based on structure intensity variation characteristic | |
| CN103983558B (en) | The determinator of a kind of reinforcing steel corrosion rate and assay method | |
| CN102426137B (en) | Testing and measuring method capable of axially loading low cycle fatigue crack initiation | |
| CN202853617U (en) | Telescopic and convenient plumb bob scale | |
| CN105973550A (en) | Integrated measuring device and method for five kinds of static rigidity of linear guide pair | |
| CN205426675U (en) | Dual -purpose test bench of bending resistance resistance to plucking of section of jurisdiction | |
| CN209841536U (en) | Rock three-point bending clamp for testing size effect | |
| CN110487576B (en) | Equal-section beam damage identification method for damage state inclination angle symmetric slope | |
| CN206208177U (en) | A kind of fixture of subsidiary raceway profile | |
| CN104110046A (en) | Entering-rock cast-in-place pile sediment thickness measuring device and utilizing method thereof | |
| CN107131811A (en) | The detection means of framework beam steel protective layer | |
| CN208140009U (en) | A kind of efficient mold plate verticality checking tool | |
| CN207300137U (en) | Heavy duty machine tools horizontal adjustment | |
| CN110489916A (en) | Uniform beam damnification recognition method based on faulted condition inclination effect line curvature | |
| CN105606448A (en) | Determination method for fracture toughness of actual cracked structure | |
| CN206160865U (en) | Hoist part multidimension comprehensive testing measuring tool | |
| CN211552685U (en) | Reinforcing cage butt joint installation accuracy detector | |
| CN104634527A (en) | Dynamic model test loading device | |
| CN205426172U (en) | Prefabricated wallboard straightness monitoring devices that hangs down | |
| CN109443328B (en) | Prestressed pipeline coordinate positioning ruler and use method thereof | |
| CN204023631U (en) | Enter rock filling pile sediment thickness testing arrangement | |
| CN102854079A (en) | An acquistion method of optimal drilling parameter of PCB drill and test system of bore hole | |
| CN206873516U (en) | A kind of power conversion device and apply its uplift pile equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140730 |
|
| RJ01 | Rejection of invention patent application after publication |