CN103883269A - Offshore drilling controllable buoyant block - Google Patents
Offshore drilling controllable buoyant block Download PDFInfo
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- CN103883269A CN103883269A CN201410153769.7A CN201410153769A CN103883269A CN 103883269 A CN103883269 A CN 103883269A CN 201410153769 A CN201410153769 A CN 201410153769A CN 103883269 A CN103883269 A CN 103883269A
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- buoyant mass
- offshore drilling
- buoyant block
- marine riser
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Abstract
The invention discloses an offshore drilling controllable buoyant block with a guide ring, and belongs to buoyant blocks special for ocean deepwater drilling engineering. The offshore drilling controllable buoyant block is suitable for the complex environment of on-sea oil and gas exploitation. According to the offshore drilling controllable buoyant block, energy input to a marine riser by water flow can be reduced, water flow stirring and eddy vibration can be reduced, ocean current and sea wave impact loads borne by the marine riser are minimum, and variable buoyancy can be further provided for the marine riser. The offshore drilling controllable buoyant block is composed of a deflection spring, an air inlet valve, an air outlet valve, the guiding ring, stretchable supporting rings and an outer cavity, and the core parts of the offshore drilling controllable buoyant block are the stretchable supporting rings composed of stretchable chains and stretchable arms. The state of the offshore drilling controllable buoyant block can be adjusted by the guiding ring at the top according to the water flow direction to enable the water passing face and the water facing face of the offshore drilling controllable buoyant block to be minimum. In addition, when the offshore drilling controllable buoyant block suffers severe sea conditions, control software used in a mated mode computes real-time loads borne by the marine riser and the offshore drilling controllable buoyant block and sends a command to a compressor after data are processed, a proper amount of air is inflated into or discharged out from the offshore drilling controllable buoyant block through the compressor, and the function of providing the variable buoyancy for the marine riser is achieved.
Description
Technical field
The present invention is marine drilling controllable type buoyant mass, belongs to the Special buoyancy piece of ocean deepwater drilling engineering, is applicable to the complex environment of exploratory engineering of off-shore petroleum/gas reservoir exploitation.
Background technology
At present global undiscovered offshore oil and gas reserves have and exceed 90% and be imbedded in the depth of water and exceed among the stratum below I000m.Therefore, ocean deepwater oil well is to promote the key point that petroleum industry advances, but the depth of water has but seriously restricted the development of ocean deepwater drilling.Present stage, the offshore petroleum drilling of China has progressively moved towards deep-sea, and as China has 981 offshore boring island of independent intellectual property right, the drilling well depth of water has reached 3000 meters, for the exploitation of the deep water marine oil and gas resource of China provides sound assurance.But along with the increase of the depth of water, the marine environment that marine drilling platform faces becomes and becomes increasingly complex.Therefore, need to before drilling well, be lowered to marine riser and isolate drilling rod and seawater, alleviate the adverse effect of marine environment to marine riser.But in the process of drilling well, appoint a lot of problem that so exists, as marine riser distortion damages, the excessive marine riser that causes of platform displacement comes off, and the corner of marine riser top/bottom part ball pivot is excessive etc., this series of problems all can cause drilling well normally to implement, and even causes huge economic loss.Therefore, need on marine riser, add buoyant mass, buoyant mass can provide buoyancy for marine riser, alleviates the load of top tensioner, reduces the distortion of marine riser.At present, in engineering, the main buoyant mass using is that these two kinds of buoyant mass exist very large deficiency, first in order to ask foamed plastics and air tank buoyant mass, buoyant mass is among the darker depth of water, be subject to higher hydrostatic pressure, be easy to be infiltrated and loss of buoyance effect by water, after buoyant mass lost efficacy, marine riser will be unstable, marine riser distortion, axial load, ball pivot corner all can increase, once exceed drilling well limit window, creep into and stop being forced to.Secondly, due to the long term of ocean current in ocean and wave, can make buoyant mass produce vortex-induced vibration, finally cause the fatigue failure of buoyant mass.
The many sections of articles such as document SPE96290, IADC/SPE112648, SPE74534, IADC/SPE39295 and field data confirm: excessive drag force, excessive skew and the excessive marine riser spherojoint corner number of degrees will cause drill-well operation to stop work; The vibrating fatigue damage accumulation of marine riser rear eddy current induction will cause marine riser premature failure, as marine riser wear and tear, comes off, ruptures and crowded ruin etc.Therefore, traditional buoyant mass is to be difficult to be embodied as marine riser variable buoyancy is provided, reduces wave current load and reduces the function of eddy current induced vibration.
Summary of the invention
The present invention has overcome some shortcomings that exist in original technology, and a kind of marine drilling controllable type buoyant mass is provided.First, buoyant mass can be according to ocean deepwater environment, and the control of acceptor center process software, for marine riser provides variable buoyancy, thereby the destruction that the current load while reducing deepwater drilling in marine environment, wave load and eddy current load cause marine riser, weakens the vibration of the sharp effect in whirlpool.Secondly, can also change upstream face and the flow surface size of buoyant mass itself.Thereby improve the force-bearing situation of riser top tensioner, alleviate the service load of riser top tensioner, reduce the flexural deformation of marine riser, slow down the fatigue damage of marine riser, strengthen the safety of deepwater drilling operating system, improve operating efficiency, to adapt to ocean deepwater drilling complex environment.
The present invention is a kind of marine drilling controllable type buoyant mass (accompanying drawing 1) of tape guide ring, this buoyant mass is made up of deflection spring, admission valve, outlet valve, guide ring, retractable support ring and exocoel, core component is wherein retractable support ring, and it is made up of flexible chain and telescopic arm in accompanying drawing 3.
Top guide ring of the present invention can be adjusted according to the variation of water (flow) direction the state of buoyant mass, now all streamlined lateral location in marine drilling controllable type buoyant mass of flow surface and upstream face, it is minimum that their area reaches, not only reduce the input of flow energy, also can effectively reduce current excitement and vortex vibration, thus the ocean current and the sea beat load minimum that allow buoyant mass be subject to.In addition, in the time running into severe sea condition, can calculate with the matching used control software of marine drilling controllable type buoyant mass real-time ocean current and the seaway load that marine riser and buoyant mass are subject to, and give an order to compressor after data processing, compressor is filled with appropriate gas in buoyant mass.Now, air pressure can drive the retractable support ring of buoyant mass to extend, it is large that marine drilling controllable type buoyant mass volume becomes, according to f=ρ gv, known marine drilling controllable type buoyant mass will provide larger buoyancy for marine riser, avoid riser top tensioner to occur that stress is concentrated, alleviate the increase of the bottom spherojoint corner number of degrees, reduce platform offset distance.When after the severe sea condition past, the gas in buoyant mass will be discharged by outlet valve.
The present invention, compared with existing buoyant mass, has following advantage: 1. guide ring is installed at buoyant mass top, and the area that can control upstream face is always minimum, effectively reduces the shock loading of ocean current and wave; 2. according to principle of hydrodynamics, improve the resemblance of buoyant mass, adopt double streamline side to reduce vortex-induced vibration; 3. can in marine drilling controllable type buoyant mass, be filled with air by air compressor, allow buoyant mass that variable buoyancy is provided; 4. retractable support ring is installed in buoyant mass, is made up of flexible chain and telescopic arm, can stretch by a certain percentage, expandable material is selected in buoyant mass outside.
Brief description of the drawings
Fig. 1 marine drilling controllable type buoyant mass stereogram;
Fig. 2 marine drilling controllable type buoyant mass top view;
Fig. 3 marine drilling controllable type buoyant mass retractable support ring schematic diagram (elongation state);
Detailed description of the invention
Details and the workflow of marine drilling controllable type buoyant mass are proposed below in conjunction with accompanying drawing detailed description the present invention.
Under severe sea condition, to control software control air compressor and in buoyant mass, inject air by the admission valve of marine drilling controllable type buoyant mass, the exterior material of buoyant mass can expand after gas injection, for marine riser provides variable buoyancy.Sea situation is sent instruction by controlling software to the outlet valve of buoyant mass through same paths after recovering, and discharges specified gas flow, and buoyant mass is shunk, and makes it to get back to original equilibrium state.Buoyant mass has just played the effect that variable buoyancy is provided like this.In addition, the guide ring at buoyant mass top coordinates compressor gas injection can automatically adjust according to the direction of current and size the size of buoyant mass upstream face and flow surface.
Control software and (applied for copyright, registration number 2013SR149069) support the use with marine drilling controllable type buoyant mass water, this software can receive the parameter such as size and direction, marine riser deformation quantity and side-play amount of seawater velocity, calculate ocean current, wave and the eddy current load of on whole section of marine riser, bearing, and the operating mode of marine riser is analyzed, judged and sends corresponding instruction to air compressor.
In the process of gas injection, in Fig. 1, admission valve 2 is opened, and air pressure drives retractable support ring 5 to extend, and buoyant mass volume increases, and larger buoyancy is provided; When exhaust, admission valve 2 cuts out, and outlet valve 3 is slowly opened, and gets rid of a certain amount of gas, and retractable support ring 5 shrinks, and then closes outlet valve 3, realizes the function that dynamically changes buoyancy.In the time that the retractable support ring 5 in Fig. 1 extends, in Fig. 3, the major and minor axis of the telescopic arm 1 of support ring extends by fixed proportion, and flexible chain 2 launches by certain radian.
In the time that marine stream direction changes, the stressed change of deflection spring 1 in Fig. 1 on guide ring 4, orders about buoyant mass and rotates, by Morison equation
Known, what the current load that the narrow structure of upstream face is subject to and wave load can be than the face widths that meets water is little.
Use in sum marine drilling controllable type buoyant mass can make the corner number of degrees of side-play amount, marine riser deflection and the bottom spherojoint of offshore boring island reduce, can avoid exceeding because of marine riser the drill-well operation shut-down that operation window causes.The front end upstream face of the two sided streamlined structure of buoyant mass can reduce current excitement, rear end flow surface can reduce eddy current induced vibration.This marine drilling controllable type buoyant mass can effectively reduce Oscillation Amplitude and the frequency of marine riser, reduces marine riser fatigue and destroys cumulative speed, improves the overall security of marine riser.
Claims (4)
1. the present invention is a kind of marine drilling controllable type buoyant mass of tape guide ring, this buoyant mass is made up of deflection spring (1), admission valve (2), outlet valve (3), guide ring (4), retractable support ring (5) and exocoel, core component is wherein retractable support ring (5), and it is made up of telescopic arm (10) and flexible chain (11).
2. marine drilling controllable type buoyant mass according to claim 1, is characterized in that, can in buoyant mass, be filled with gas by air compressor, for marine riser provides variable buoyancy.
3. marine drilling controllable type buoyant mass according to claim 1, is characterized in that, described buoyant mass is class ellipse, two sided streamlined structure.
4. marine drilling controllable type buoyant mass according to claim 1, it is characterized in that, the guide ring (4) at described buoyant mass top can be adjusted according to the variation of water (flow) direction the state of buoyant mass, can reduce the input of flow energy, also can effectively reduce current excitement and vortex vibration, thus the ocean current and the sea beat load minimum that allow buoyant mass be subject to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153769.7A CN103883269A (en) | 2014-04-17 | 2014-04-17 | Offshore drilling controllable buoyant block |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410153769.7A CN103883269A (en) | 2014-04-17 | 2014-04-17 | Offshore drilling controllable buoyant block |
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| CN103883269A true CN103883269A (en) | 2014-06-25 |
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| CN201410153769.7A Pending CN103883269A (en) | 2014-04-17 | 2014-04-17 | Offshore drilling controllable buoyant block |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179463A (en) * | 2014-07-09 | 2014-12-03 | 燕山大学 | Deep water well drilling marine riser vertical device |
| CN105625949A (en) * | 2014-11-03 | 2016-06-01 | 上海海郑海洋建设工程技术有限公司 | Marine riser and offshore drilling system |
| GB2533123A (en) * | 2014-12-10 | 2016-06-15 | Magma Global Ltd | Composite component deployment configurations |
| CN107091379A (en) * | 2017-06-27 | 2017-08-25 | 大连理工大学 | A kind of streamlined energy conduit of mitigation submarine landslide impact |
| CN108150152A (en) * | 2018-01-11 | 2018-06-12 | 宋跃海 | Carbonate rock individual well measuring instrument mounting bracket |
| CN113460235A (en) * | 2021-08-12 | 2021-10-01 | 海南热带海洋学院 | Ocean communication buoy |
| US11780536B2 (en) | 2021-08-12 | 2023-10-10 | Hainan Normal University | Marine communication buoy |
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| WO2002095278A1 (en) * | 2001-05-18 | 2002-11-28 | Crp Group Limited | Protection of underwater elongate members |
| CN101509379A (en) * | 2009-03-17 | 2009-08-19 | 西南石油大学 | Deep water riser buoyance block closed-loop control system |
| CN102979490A (en) * | 2012-11-27 | 2013-03-20 | 西南石油大学 | Bubble-column vortex-induced vibration suppression device of stand pipe under marine environment |
| CN103306613A (en) * | 2013-06-25 | 2013-09-18 | 西南石油大学 | Vortex-induced vibration inhibition device for marine riser of adjustable and rotatable separating disk |
-
2014
- 2014-04-17 CN CN201410153769.7A patent/CN103883269A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002095278A1 (en) * | 2001-05-18 | 2002-11-28 | Crp Group Limited | Protection of underwater elongate members |
| CN101509379A (en) * | 2009-03-17 | 2009-08-19 | 西南石油大学 | Deep water riser buoyance block closed-loop control system |
| CN102979490A (en) * | 2012-11-27 | 2013-03-20 | 西南石油大学 | Bubble-column vortex-induced vibration suppression device of stand pipe under marine environment |
| CN103306613A (en) * | 2013-06-25 | 2013-09-18 | 西南石油大学 | Vortex-induced vibration inhibition device for marine riser of adjustable and rotatable separating disk |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179463A (en) * | 2014-07-09 | 2014-12-03 | 燕山大学 | Deep water well drilling marine riser vertical device |
| CN104179463B (en) * | 2014-07-09 | 2016-01-27 | 燕山大学 | Deep Water Drilling Riser vertical means |
| CN105625949A (en) * | 2014-11-03 | 2016-06-01 | 上海海郑海洋建设工程技术有限公司 | Marine riser and offshore drilling system |
| GB2533123A (en) * | 2014-12-10 | 2016-06-15 | Magma Global Ltd | Composite component deployment configurations |
| CN107091379A (en) * | 2017-06-27 | 2017-08-25 | 大连理工大学 | A kind of streamlined energy conduit of mitigation submarine landslide impact |
| CN108150152A (en) * | 2018-01-11 | 2018-06-12 | 宋跃海 | Carbonate rock individual well measuring instrument mounting bracket |
| CN108150152B (en) * | 2018-01-11 | 2020-12-25 | 巴音郭楞职业技术学院 | Carbonate rock single-well measuring instrument mounting bracket |
| CN113460235A (en) * | 2021-08-12 | 2021-10-01 | 海南热带海洋学院 | Ocean communication buoy |
| CN113460235B (en) * | 2021-08-12 | 2022-07-05 | 海南师范大学 | Ocean communication buoy |
| WO2023015854A1 (en) * | 2021-08-12 | 2023-02-16 | 海南师范大学 | Marine communication buoy |
| US11780536B2 (en) | 2021-08-12 | 2023-10-10 | Hainan Normal University | Marine communication buoy |
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Application publication date: 20140625 |