CN106988682A - A kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill and method - Google Patents
A kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill and method Download PDFInfo
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- CN106988682A CN106988682A CN201710257466.3A CN201710257466A CN106988682A CN 106988682 A CN106988682 A CN 106988682A CN 201710257466 A CN201710257466 A CN 201710257466A CN 106988682 A CN106988682 A CN 106988682A
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- drill
- main body
- drilling
- branch
- rock bit
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Links
- 238000005553 drilling Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 43
- 102000002322 Egg Proteins Human genes 0.000 claims abstract description 30
- 108010000912 Egg Proteins Proteins 0.000 claims abstract description 30
- 210000003278 egg shell Anatomy 0.000 claims abstract description 30
- 239000002689 soil Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 4
- 230000006378 damage Effects 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- 239000010437 gem Substances 0.000 claims description 2
- 229910001751 gemstone Inorganic materials 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/18—Roller bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
- E21B7/185—Drilling by liquid or gas jets, with or without entrained pellets underwater
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
Drilling target drill and method are actively pierced through the present invention relates to a kind of pile legs of self-elevating drilling platform, wherein, top is provided with the drill main body of male joint to the target drill and bottom offers branch's rock bit of hydrophthalmia；Drill main body can be connected by male joint with the drill string bottom of rig；The mandrel of multiple tube column structures is fixedly installed in multiple spot in a distributed manner for the bottom of drill main body, and multiple branch's rock bit are separately mounted on each mandrel, and can be rotated around mandrel；It is additionally provided with inside drill main body in inner flow passage, mandrel and offers middle duct, the middle duct of mandrel is connected with the inner flow passage of drill main body, the hydrophthalmia of branch's rock bit and the middle duct of mandrel is connected.The present invention can realize that bores that large area expeditiously destroys " egg shell " stratum under one time actively pierces through operation, be greatly decreased and remove drill string operation, " egg shell " stratum operation expense, effective guarantee job safety are broken in reduction active.
Description
Technical field
The present invention relates to a kind of target drill and method, more particularly to a kind of pile legs of self-elevating drilling platform master of breaking ground that drill
It is dynamic to pierce through drilling target drill and method.
Background technology
Self-elevating drilling platform is that sea is drilled one of important equipment of well, has become 120 meters of the depth of water at present with inland sea
Domain is drilled the main force of well operations equipment.Self-elevating drilling platform supports hull and rig etc. by the spud leg for standing on seabed and set
Standby, hull and implement rise to certain height above sea level, carry out probing and completion practice.However, standing in seabed superficial part soil
Spud leg in layer bears hull, equipment and operating load, can destroy seabed superficial part soil layer unavoidably and unstability.Jack-up rigs are put down
The phenomenon that platform spud leg penetrates submarine soil layer suddenly and quickly enters mud referred to as " is pierced through ".Puncture accident occurs for self-elevating drilling platform
When, platform can be caused to damage, or even sinking, personal security is threatened, economic loss is huge.The puncture accident of burst is jack up
The accident risk that one can not be ignored during drilling platforms safety work.In order to avoid piercing through the generation of accident, it is necessary to fully
Operation feasibility of the self-elevating drilling platform in target well site position is proved, the final driving depth of science judgment spud leg and the soil body are held
Loading capability.If existing, depth is shallower and hard stratum of thinner thickness, and the thicker soil intensity under the thin hard stratum compared with
It is low, can image be compared to " egg shell " stratum, pile legs of self-elevating drilling platform is stepped down on such " egg shell " stratum, can faced
Greatly pierce through risk.In order to take precautions against puncture risk, before the position of self-elevating drilling platform target well site in place, need to artificially it locate
Reason is fallen to design " egg shell " stratum at spud leg position, i.e. use is actively pierced through bore mode and broken " egg shell ".
At present, actively pierce through generally using conventional drilling with drill bit or be equipped with re-drill bit carries out " egg shell " stratum brill
Hole.In order to improve the spud leg bearing capacity of self-elevating drilling platform, the huge shoe of sectional area can be generally installed in spud leg bottom
Structure, and huge shoe make it that the area that spud leg is stepped down on submarine soil layer also can be huge, therefore avoid spud leg from occurring to pierce through thing
Therefore active pierce through drilling area also can be huge.Break huge " egg shell " stratum of area in order to actively drill, it is necessary to
Dozens or even hundreds of hole is bored in stratum, causes to need to remove drill string ability tens times even up to a hundred times using conventional bit drilling
Bore operation is actively pierced through in completion, and operating efficiency is extremely low, and operating cost is high, for Gao Fei marine bore operation, conventional
Bit bore realizes that the mode actively pierced through is less economical.
The content of the invention
In view of the above-mentioned problems, it is special that drilling is actively pierced through it is an object of the invention to provide a kind of pile legs of self-elevating drilling platform
Drill bit and method, by the multiple branch's rock bit installed in drill main body bottom, realize brill large area high efficiency under one time
Operation is actively pierced through on ground destruction " egg shell " stratum, is preferably drilled and is broken " egg shell " stratum, is greatly decreased and removes drill string
Operation, effectively improves and actively pierces through bore operation efficiency, and reduction actively breaks " egg shell " stratum operation expense, is risen certainly for reduction
Formula drilling platforms pitching pile pierces through risk, it is to avoid the generation of self-elevating drilling platform unstability accident, ensures that job safety provides technology
Support.
To achieve the above object, the present invention takes following technical scheme：A kind of pile legs of self-elevating drilling platform is actively pierced through
Drill target drill, it is characterised in that top is provided with the drill main body of male joint to the drill bit and bottom offers water
Branch's rock bit of eye；Wherein, the drill main body can be connected by the male joint with the drill string bottom of rig；Institute
The mandrel of multiple tube column structures, multiple branch's rotary drills are fixedly installed in multiple spot in a distributed manner for the bottom for stating drill main body
Head is separately mounted on each mandrel, and can be rotated around the mandrel；Inner flow passage is additionally provided with inside the drill main body,
Middle duct, the middle duct of the mandrel and the inner flow passage phase of the drill main body are offered in the mandrel
Connection, the hydrophthalmia of branch's rock bit and the middle duct of the mandrel are connected.
The drill main body is the vertebral body structure with discoid bottom.
Branch's rock bit uses the gear wheel of conventional Cone Bit Design；Or, branch's rock bit is used
Gear wheel with Hydrodynamic design.
Various forms of branch's rock bit are installed on the different mandrels of the drill main body bottom, formed " 1+N "
Formula drill bit.
The drill main body and branch's rock bit are processed using steel body foundry engieering.
A kind of pile legs of self-elevating drilling platform actively pierces through boring method, comprises the following steps：
1) pile legs of self-elevating drilling platform described in any one as described above is actively pierced through to drilling target drill and passes through pin thread
Joint is installed to the drill string bottom of rig, and the inner flow passage of drill main body is connected with the drilling mud pump in drilling circulation system
It is logical；
2) bored under control rig, seawater is pumped into drill bit master by the drilling mud pump in drilling circulation system by drill string
Body, then branches to each branch's rock bit by the inner flow passage of drill main body, and from the water of branch's rock bit bottom
Gone out in eye, form water jet, hydraulic blow is formed to " egg shell " stratum；Coordinate what each branch's rock bit rotational band was come
Moment of torsion and drill string push the pressure of the drill of offer, produce impact and shear action to " egg shell " stratum, break " egg shell ", destruction soil
The globality of body；Meanwhile, installed on the mandrel that drill main body bottom is distributed in multiple spot and bore energy under multiple branch's rock bit, one time
" egg shell " hard stratum of larger area is enough destroyed, single time drilling can form the drilling of larger diameter, so as to realize jack up
The bore operation that drilling platform leg is actively pierced through.
The present invention is due to taking above technical scheme, and it has advantages below：1st, a kind of jack-up rigs of the invention are put down
Platform spud leg actively pierces through drilling target drill and method, by the multiple branch's rock bit installed in drill main body bottom, real
That bores that large area expeditiously destroys " egg shell " stratum under existing one time actively pierces through operation, preferably drills and breaks " egg shell "
Stratum, is greatly decreased and removes drill string operation, effectively improves and actively pierces through bore operation efficiency, and reduction active is with breaking " egg shell "
Layer operating cost, pierces through risk, it is to avoid the generation of self-elevating drilling platform unstability accident for reduction self-elevating drilling platform pitching pile,
Ensure that job safety provides technical support.2nd, a kind of pile legs of self-elevating drilling platform of the invention actively pierces through drilling target drill
And method, by internally setting from male joint at the top of drill main body to the runner of branch's rock bit bottom insertion, make sea
Water is gone out to form water jet from hydrophthalmia, and hydraulic blow is formed to " egg shell " stratum；Each branch's rock bit is coordinated to rotate
The moment of torsion and drill string that bring push the pressure of the drill of offer, and the effect such as impact and cutting is produced to " egg shell " stratum, breaks " egg
Shell ", destroys the globality of the soil body, reduces soil strength, so as to weaken soil body unit area bearing capacity, realizes that jack-up rigs are put down
The bore operation that platform spud leg is actively pierced through, operating efficiency is higher.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of drill main body of the present invention.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, a kind of pile legs of self-elevating drilling platform that the present invention is provided actively pierces through drilling special jewel
Head, it includes drill main body 1 and branch's rock bit 2.Wherein, drill main body 1 is the vertebral body structure with discoid bottom, is bored
The top of head main body 1 is provided with male joint 11, and drill main body 1 can be connected by male joint 11 with the drill string bottom of rig
Connect；The mandrel 12 of multiple tube column structures is fixedly installed in multiple spot in a distributed manner for the discoid bottom of drill main body 1；Drill main body
Be additionally provided with inside 1 in inner flow passage 13, mandrel 12 and offer middle duct (not shown), the middle duct of mandrel 12 with
The inner flow passage 13 of drill main body 1 is connected.Multiple branch's rock bit 2 are separately mounted on each mandrel 12, and can be around mandrel
12 rotate, so as to form " 1+N " formula drill bit；The bottom of branch's rock bit 2 is offered in hydrophthalmia 21, hydrophthalmia 21 and mandrel 12
Between duct be connected.
In above-described embodiment, various forms of branch's rotary drills can be installed on the different mandrels 12 of the bottom of drill main body 1
First 2, so as to form " 1+N " formula drill bit；It is of course also possible to all using identical branch rock bit 2.
In above-described embodiment, the gear wheel that branch's rock bit 2 can above be designed using conventional rock bit；Or,
Branch's rock bit 2 can use the gear wheel with Hydrodynamic design for special formation, preferably to cut and impact failure
" egg shell " stratum.
In above-described embodiment, drill main body 1 and branch's rock bit 2 are processed using steel body foundry engieering.
Drilling target drill is actively pierced through based on a kind of above-mentioned pile legs of self-elevating drilling platform, present invention also offers one
Plant pile legs of self-elevating drilling platform and actively pierce through boring method, comprise the following steps：
1) above-mentioned pile legs of self-elevating drilling platform is actively pierced through to drilling target drill to be installed to by male joint 11
The drill string bottom of rig, the inner flow passage 13 of drill main body 1 is connected with the drilling mud pump in drilling circulation system.
2) bored under control rig, seawater is pumped into and actively pierced by the drilling mud pump in drilling circulation system by drill string
Drilling target drill is worn, each branch's rock bit 2 is then branched to by the inner flow passage 13 of drill main body 1, and from branch
Gone out in the hydrophthalmia 21 or nozzle of the bottom of rock bit 2, form water jet, hydraulic blow is formed to " egg shell " stratum；Coordinate
The moment of torsion and drill string that each rotational band of branch's rock bit 2 is come push the pressure of the drill of offer, " egg shell " stratum is produced impact with
The effect such as cutting, breaks " egg shell ", destroys the globality of the soil body, reduces soil strength, is held so as to weaken soil body unit area
Power is carried, the bore operation that pile legs of self-elevating drilling platform is actively pierced through is realized.Simultaneously as the discoid bottom of drill main body 1
Various forms of branch's rock bit 2 can be installed, so as to form " 1+N " formula drill bit, one time on the mandrel 12 being distributed in multiple spot
Lower brill can destroy " egg shell " hard stratum of larger area, and single time drilling can form the drilling of larger diameter, more conventional tooth
The bore diameter that the surface hole drilling mode for the tool that spuds in that wheel drill bit cooperation reamer is constituted is formed is several times greater, effectively improves master
It is dynamic to pierce through drilling efficiency, round trip is reduced, operating cost is reduced.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, set location and its connected mode etc.
It can all be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be arranged
In addition in protection scope of the present invention.
Claims (9)
1. a kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill, it is characterised in that the drill bit is set including top
The drill main body and bottom for being equipped with male joint offer branch's rock bit of hydrophthalmia；Wherein, the drill main body can pass through
The male joint is connected with the drill string bottom of rig；The bottom of the drill main body is fixedly installed many in a distributed manner in multiple spot
The mandrel of individual tube column structure, multiple branch's rock bit are separately mounted on each mandrel, and can be around the mandrel
Rotate；Be additionally provided with inside the drill main body in inner flow passage, the mandrel and offer middle duct, the mandrel it is described
Middle duct is connected with the inner flow passage of the drill main body, the hydrophthalmia and the core of branch's rock bit
The middle duct of axle is connected.
2. a kind of pile legs of self-elevating drilling platform as claimed in claim 1 actively pierces through drilling target drill, it is characterised in that
The drill main body is the vertebral body structure with discoid bottom.
3. a kind of pile legs of self-elevating drilling platform as claimed in claim 1 or 2 actively pierces through drilling target drill, its feature exists
In branch's rock bit uses the gear wheel of conventional Cone Bit Design；Or, branch's rock bit uses band hydrodynamic(al)
The gear wheel of power design.
4. a kind of pile legs of self-elevating drilling platform as claimed in claim 1 or 2 actively pierces through drilling target drill, its feature exists
In installing various forms of branch's rock bit on the different mandrels of the drill main body bottom, form " 1+N " formula and bore
Head.
5. a kind of pile legs of self-elevating drilling platform as claimed in claim 3 actively pierces through drilling target drill, it is characterised in that
Various forms of branch's rock bit are installed on the different mandrels of the drill main body bottom, " 1+N " formula drill bit is formed.
6. a kind of pile legs of self-elevating drilling platform as described in claim 1 or 2 or 5 actively pierces through drilling target drill, it is special
Levy and be, the drill main body and branch's rock bit are processed using steel body foundry engieering.
7. a kind of pile legs of self-elevating drilling platform as claimed in claim 3 actively pierces through drilling target drill, it is characterised in that
The drill main body and branch's rock bit are processed using steel body foundry engieering.
8. a kind of pile legs of self-elevating drilling platform as claimed in claim 4 actively pierces through drilling target drill, it is characterised in that
The drill main body and branch's rock bit are processed using steel body foundry engieering.
9. a kind of pile legs of self-elevating drilling platform actively pierces through boring method, comprise the following steps：
1) pile legs of self-elevating drilling platform as any one of above-mentioned claim 1 to 8 is actively pierced through to drilling special jewel
Head is installed to the drill string bottom of rig, inner flow passage and the drilling well mud in drilling circulation system of drill main body by male joint
Stock pump is connected；
2) bored under control rig, seawater is pumped into drill main body by the drilling mud pump in drilling circulation system by drill string,
Then each branch's rock bit is branched to by the inner flow passage of drill main body, and from the hydrophthalmia of branch's rock bit bottom
Go out, form water jet, hydraulic blow is formed to " egg shell " stratum；The moment of torsion for coordinating each branch's rock bit rotational band
The pressure of the drill of offer is provided with drill string, impact and shear action are produced to " egg shell " stratum, broken " egg shell ", the destruction soil body
Globality；Meanwhile, multiple branch's rock bit are installed on the mandrel that drill main body bottom is distributed in multiple spot, one time lower brill can be broken
" egg shell " hard stratum of bad larger area, single time drilling can form the drilling of larger diameter, so as to realize jack-up rigs
The bore operation that platform leg is actively pierced through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257466.3A CN106988682B (en) | 2017-04-19 | 2017-04-19 | A kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257466.3A CN106988682B (en) | 2017-04-19 | 2017-04-19 | A kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106988682A true CN106988682A (en) | 2017-07-28 |
| CN106988682B CN106988682B (en) | 2019-04-23 |
Family
ID=59416457
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710257466.3A Active CN106988682B (en) | 2017-04-19 | 2017-04-19 | A kind of pile legs of self-elevating drilling platform actively pierces through drilling target drill and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886577A (en) * | 2019-11-29 | 2020-03-17 | 深圳宏业基岩土科技股份有限公司 | Construction method for perpendicularity control of rotary excavating hard secant pile in deep and thick rockfill area |
| CN112267460A (en) * | 2020-09-03 | 2021-01-26 | 中海油能源发展股份有限公司 | Active puncturing pile shoe structure of self-elevating drilling platform and operation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3075593A (en) * | 1959-11-18 | 1963-01-29 | Timken Roller Bearing Co | Drill bit |
| US20050023039A1 (en) * | 2003-06-25 | 2005-02-03 | Stoetzer Erwin Emil | Method for sinking a borehole in the ground and wet boring tool |
| CN106245626A (en) * | 2016-08-15 | 2016-12-21 | 中建三局基础设施工程有限公司 | A kind of hard formation churning driven enters method |
| CN106320986A (en) * | 2016-10-08 | 2017-01-11 | 郑州神利达钻采设备有限公司 | Precise drilling drill bit with deviation preventing function |
| CN107687320A (en) * | 2017-09-15 | 2018-02-13 | 湖南新金刚工程机械有限公司 | A kind of cluster type down-hole hammer |
-
2017
- 2017-04-19 CN CN201710257466.3A patent/CN106988682B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3075593A (en) * | 1959-11-18 | 1963-01-29 | Timken Roller Bearing Co | Drill bit |
| US20050023039A1 (en) * | 2003-06-25 | 2005-02-03 | Stoetzer Erwin Emil | Method for sinking a borehole in the ground and wet boring tool |
| CN106245626A (en) * | 2016-08-15 | 2016-12-21 | 中建三局基础设施工程有限公司 | A kind of hard formation churning driven enters method |
| CN106320986A (en) * | 2016-10-08 | 2017-01-11 | 郑州神利达钻采设备有限公司 | Precise drilling drill bit with deviation preventing function |
| CN107687320A (en) * | 2017-09-15 | 2018-02-13 | 湖南新金刚工程机械有限公司 | A kind of cluster type down-hole hammer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886577A (en) * | 2019-11-29 | 2020-03-17 | 深圳宏业基岩土科技股份有限公司 | Construction method for perpendicularity control of rotary excavating hard secant pile in deep and thick rockfill area |
| CN112267460A (en) * | 2020-09-03 | 2021-01-26 | 中海油能源发展股份有限公司 | Active puncturing pile shoe structure of self-elevating drilling platform and operation method thereof |
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| Publication number | Publication date |
|---|---|
| CN106988682B (en) | 2019-04-23 |
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