CN201121487Y - Deepwater drilling device based on near surface deviation - Google Patents
Deepwater drilling device based on near surface deviation Download PDFInfo
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- CN201121487Y CN201121487Y CNU200720172925XU CN200720172925U CN201121487Y CN 201121487 Y CN201121487 Y CN 201121487Y CN U200720172925X U CNU200720172925X U CN U200720172925XU CN 200720172925 U CN200720172925 U CN 200720172925U CN 201121487 Y CN201121487 Y CN 201121487Y
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- marine riser
- ballast tank
- near surface
- drilling device
- deepwater drilling
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Abstract
The utility model relates to a deep-in-water well drilling device based on disassembly close to the water surface. The deep-in-water well drilling device is characterized in that a marine riser connected with a drilling platform is included, wherein, the middle of the marine riser is provided with an upper flexible joint; the marine riser passes through a buoyancy compartment so as to be connected with a blow-out preventer; the upper part of the buoyancy compartment is connected with the marine riser through a disassembling device; a ballast tank is arranged under the blow-out preventer, and the place between the blow-out preventer and the ballast tank is provided with an upper wellhead. The deep-in-water well drilling device also includes a stress joint with a centralizer, wherein, the upper part of the stress joint stretches deeply into the ballast tank to be connected with the upper wellhead, while the lower part of the stress joint is connected with a high-pressure marine riser which is externally provided with a buoyancy block; the bottom of the high-pressure marine riser is orderly connected with a lower flexible joint, a lower wellhead, a conduit and a sleeve; the conduit and the sleeve are fixed on the seabed; the place between the periphery of the blow-out preventer and the lower part of a moon pool opening of the drilling platform is provided with at lest three centralizing ropes. The deep-in-water well drilling device has strong applicability, good performance and convenient marine riser disassembly, and can be widely used for deep-in-water well drilling.
Description
Technical field
The utility model relates to a kind of offshore oil drilling device, particularly about a kind of deepwater drilling device based near surface deviation.
Background technology
Deepwater drilling device is summarized three kinds, comprise with preventer (BOP) be arranged on mud line place, seabed the conventional drilling device, preventer is arranged on the drilling rig in the water and preventer is arranged on drilling rig waterborne.
The conventional drilling device is positioned over the seabed with preventer, and drill ship is connected with marine riser with subsea wellheads.Along with the increase of the depth of water, the conventional drilling mode that preventer is set under water is faced with very big challenge.On the one hand, increase along with the depth of water, need longer marine riser and drilling rod, to expend more mud, the equipment of high pressure grade more thus, the weight of marine riser and preventer and size also increase greatly, so must have enough deck loads and deck space so that store required marine riser, drilling rod, sleeve pipe and other bulk cargo etc., to satisfy the requirement of wellbore construction, so will have bigger implement, to satisfy the needs of equipment movement.On the other hand, the depth of water increases, the operating environment aggravation that deep water is abominable, make and remove marine riser, sleeve pipe and drilling rod can expend for a long time, particularly running into typhoon etc. in emergency circumstances, the disengaging of marine riser is difficulty more, to cause drilling well to increase nonproductive time like this, reliability requirement to equipment improves, make the deepwater drilling platform present the trend of maximization, comprise the deck changing load, the platform principal dimensions, carrying capacity, every indexs such as material storage ability make the expense of drillng operation increase considerably all to large-scale development so on the one hand, have brought very big risk also for the deepwater drilling operation.
In order to overcome the conventional shortcoming that the deepwater drilling device of preventer is set under water, development in recent years a kind of preventer is arranged on surperficial preventer system (SBOP) waterborne.The drilling rig that preventer is set waterborne comprises water surface preventer, high pressure marine riser, parting system (SID) and be used for control system of these assemblies etc. under water.Its major advantage of drilling rig that preventer is set waterborne is, can use little light marine riser, makes cheap third generation drill ship can enter deep water, thereby reduces the expense of deepwater work greatly.But the drilling rig that preventer is set waterborne also has the shortcoming of self, because preventer is more than the water surface, can not separate with drill ship, therefore causing in case of emergency, marine riser breaks away from difficulty, the restriction that is subjected to sea situation and geological conditions during use is bigger, can only be relatively good in sea conditions, the more clearly well location of strata condition uses.
In addition, Norway ADTH company has proposed a kind of artificial seafloor well system (ABS system), be to be that 20 meters, high 10 meters floating drum are installed on 250 meters under water with a diameter, well head and preventer are placed on the floating drum, and the floating drum bottom is connected with tie back stem (22 cun of external diameters).Can conveniently withdraw like this, can reduce requirement, under the assistance of less important work ship, can make cheap third generation drill ship enter deep water drill ship.But there is following shortcoming in this ABS system: 1, owing to be subjected to the influence of system's stress, too big flow velocity can not bear in the ABS system, and floating drum is installed under water dark (250 meters～300 meters), and is not only very high to the requirement of system, and operation is also inconvenient.2, because the weight of floating drum itself big (reaching 379.1 tons), also need to bear all wt of preventer and bottom tie back stem, this just need provide enough buoyancy, so makes the size of floating drum very big (nearly 20 meters of diameter, high 10 meters).3, because the size of floating drum is very big, so installation exercise is very time-consuming, and the expense of manufacturing is also high, and the depth of water of use also is restricted, and maximum water depth is 1500 meters.4, because preventer directly is seated on the floating drum, and preventer weight is very big, the system's center of gravity that makes floating drum and preventer form like this is higher, and the stability of system is bad, so the safety of system and operation etc. have all been brought very big negative effect.
Summary of the invention
At the problems referred to above, the purpose of this utility model provides a kind of good stability, and applicability is strong, expense is cheap, can be used for the deepwater drilling device based near surface deviation than the territory, deep-sea.
For achieving the above object, the utility model is taked following technical scheme: a kind of deepwater drilling device based near surface deviation, it is characterized in that: it comprises a marine riser that is connected with offshore boring island, the centre of described marine riser is provided with flexible joint on, described marine riser passes a buoyancy compartment and is connected with a preventer, described buoyancy compartment upper end is connected with described marine riser by a release unit, described preventer seat is in a top well head, well head below, described top is a ballast tank, the one stress joint upper end that is provided with centralizer is goed deep into being connected with described top well head in the described ballast tank, described stress joint lower end connects a high pressure marine riser, described high pressure marine riser outer setting has buoyant mass, the bottom of high pressure marine riser connects flexible joint down successively, the bottom well head, conduit and sleeve pipe, described conduit and sleeve pipe are fixed in the seabed, described preventer circumferentially and have between the bottom of offshore boring island moon pool opening and be connected with three at least and set upright rope.
Described buoyancy compartment is the airtight metal drum of an elongated cylindrical, has a central shaft hole that vertically runs through described buoyancy compartment along its central axis, and the inside of described buoyancy compartment has several airtight cabins.
Described ballast tank is an oval-shaped airtight metal ball body, and its central axis has a central shaft hole that vertically runs through described ballast tank, and the inside of described ballast tank has several airtight cabins.
Described preventer is positioned at the following 80～100m place of the water surface.
The external diameter of described high pressure marine riser is 16 ".
Between described flexible joint down and bottom well head, be provided with a described emergency shutdown device.
The utility model is owing to take above technical scheme, and it has the following advantages: 1, the utility model is installed in preventer apart from the position of 80～100m below the water surface, can make things convenient for underwater operation like this, reduces the buoyancy requirement to equipment.2, the utility model is provided with at least three (generally adopting four) and sets upright rope as stopping means between the circumferential and offshore boring island of preventer, set upright the lateral displacement that rope not only can reduce buoyancy system and preventer, the mechanical property of improvement system, the compliance of raising system, increase the operation window, and when the well system rountrip, setting upright rope can also the Auxiliary Ballast Tank rountrip.3, the utility model is with a buoyancy tube of prior art, be divided into and be arranged on two upper and lower buoyancy tubes of preventer, be buoyancy compartment and ballast tank, therefore not only can reduce the center of gravity of the whole system that comprises buoyancy compartment, preventer and ballast tank effectively, the stability of raising system and compliance, and the effect that can realize reducing the size of upper and lower floating drum and break through depth of water restriction.4, the utility model is the characteristics of weakest link in the system according to the junction of top well head and high pressure marine riser, be provided with a stress joint, thereby improved mechanical property of the present utility model effectively, reduced the maximum stress of system, improved the applicability of whole system.5, the utility model to adopt external diameter be 16 " minor diameter high pressure marine riser; and increase sheathed buoyant mass on it in the outside of high pressure marine riser; therefore can reduce lower pontoon and promote the needed buoyancy of its underpart high pressure marine riser, for very big effect is played in the restriction that breaks through the depth of water.The utlity model has advantages such as applicability is strong, functional, expense is cheap, underwater operation is convenient, both can overcome the difficult problem of marine riser disengaging that surperficial preventer system (SBOP) exists, can overcome many shortcomings that artificial seafloor well system (ABS) exists again, the utility model can be widely used in the various deepwater drilling processes.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the utility model stress joint connection diagram
Fig. 3 is the utility model buoyancy compartment structural representation
Fig. 4 is the utility model ballast tank contour structures schematic diagram
Fig. 5 is the utility model ballast tank internal construction schematic diagram
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1 and Figure 2, the utility model comprises a conventional marine riser 2 that is connected with offshore boring island 1, flexible joint 3 on one is set in the middle of the marine riser 2, marine riser 2 passes a buoyancy compartment 4, be connected with a preventer 5, preventer 5 is installed in apart from 80～100m place below the water surface A, buoyancy compartment 4 upper ends be provided with one with marine riser 2 release units 6, one ballast tank, 7, one top well heads 8 are being set between preventer 5 and ballast tank 7 and sit and to be hung in ballast tank 7 central shaft holes below the preventer 5.The upper end of one stress joint 9 is goed deep into being connected with top well head 8 in ballast tank 7 central shaft holes, is provided with centralizer 10 between stress joint 9 and the ballast tank 7 central axis hole walls.The lower end of stress joint 9 connects a high pressure marine riser 11, the outer cover of high pressure marine riser 11 is provided with a buoyant mass 12, the bottom of high pressure marine riser 11 be linked in sequence down according to a conventional method flexible joint 13, emergency shutdown device 14 (can select for use or need not), bottom well head 15, conduit 16 and sleeve pipe 17, conduit 16 and sleeve pipe 17 all be fixed in the seabed.Set upright rope 18 bottoms with four and be connected to the circumferential of preventer 5, set upright the bottom that rope 18 top is connected to offshore boring island 1 moon pool opening 19 with four, set upright rope 18 for four and form a stopping means, the quantity of setting upright rope 18 can also be three, five or the six roots of sensation etc.Set upright the lateral displacement that rope 18 can reduce buoyancy system (being buoyancy compartment 4 and ballast tank 7) and preventer 5, improve the mechanical property of system, improve the compliance of system, increase the operation window.When drillng operation, set upright rope 18 and remove the located lateral be used for system, can also be when system's rountrip the rountrip of Auxiliary Ballast Tank 7.
In the foregoing description, last flexible joint 3, marine riser 2, release unit 6 are identical with conventional deepwater drilling device, and the effect of release unit 6 is can the device of marine riser 2 with the bottom be separated from by release unit 6 when needed.Following flexible joint 13 and bottom well head 15 are the parts that conventional deepwater drilling device adopts, and are arranged near the emergency shutdown device 14 of mud line, can increase the safety of the utility model system in emergency circumstances.Emergency shutdown device 14 can be chosen from market according to actual needs.As the case may be, the utility model also can not be provided with emergency shutdown device 14.
In the foregoing description, the concrete model of stress joint 9 need be selected for use according to concrete sea conditions, show according to relevant computational analysis, stress joint 9 present positions are weak links of whole device, the utility model adds the maximum stress that stress joint 9 can reduce system herein, improve mechanical property of the present utility model, improve its applicability.
As shown in Figure 3, in the foregoing description, buoyancy compartment 4 can be the airtight metal drum 41 of an elongated cylindrical, and its central axis has a central shaft hole 42 that vertically runs through buoyancy compartment 4, and central shaft hole 42 can pass for the conventional marine riser 2 of drilling rig; Be divided into several mutually airtight cabins 43 in the buoyancy compartment 4, if there have indivedual cabins 43 to take place to be damaged, buoyancy compartment 4 still can provide enough buoyancy, and the buoyancy that buoyancy compartment 4 provides is mainly born the weight of preventer 5.
Shown in Fig. 4,5, in the foregoing description, ballast tank 7 is oval-shaped airtight metal ball body 71, its central axis has a central shaft hole 72 that vertically runs through ballast tank 7, the top well head 8 of drilling rig can be sat and be hung in central shaft hole 72 suitable for reading, and stress joint 9 upper ends can be goed deep into from the end opening of central shaft hole 72 being connected with top well head 8 in this central shaft hole 72; Be divided into several airtight cabins 73 mutually in the ballast tank 7, when 73 breakages of a cabin were wherein arranged, ballast tank 7 still can provide enough buoyancy.The conventional ballasting system (not shown) of one cover is housed in the ballast tank 7, and it links to each other by the control system of umbilical cables with offshore boring island 9, carries out ballast operation with control ballast tank 7.The buoyancy that ballast tank 7 provides is mainly born the weight of drilling rig middle and upper part well head 8 and the weight of part high pressure marine riser 11, and ballast tank 7 also provides the interface with high pressure marine riser 11 in addition.
In the foregoing description, the buoyancy of buoyancy compartment 4 and ballast tank 7 and the weight of preventer 5 etc. are coordinated mutually, make that the center of gravity of buoyancy compartment 4, preventer 5 and ballast tank 7 is minimum, and stability is best, and then expands operation window of the present utility model.High pressure marine riser 11 adopts external diameters 16 " minor diameter high pressure marine riser; can reduce the requirement to the utility model device buoyancy system; add buoyant mass 12 in the outside of high pressure marine riser 11, its diameter is less, so also can pass through from buoyancy compartment 4 and ballast tank 7 easily.Because external diameter 16 " the specification of high pressure marine riser 11 less, be provided with buoyant mass 11 simultaneously, so can reduce the lifting force of buoyancy system to the high pressure marine riser 11 of its underpart.
The utility model device is in installation process, at first utilize and set upright rope 18 and ballast tank 7 is hung at offshore boring island 1 moon pool mouth 19, order is with top well head 8 then, stress joint 9, high pressure marine riser 11, buoyant mass 12, following flexible joint 13, emergency shutdown device 14 grades are lowered under water, set upright rope 18 ballast tank 7 and lower device are transferred to precalculated position (positions of following 80～100 meters degree of depth of sea A) under water together by loosening again, with bottom well head 15, conduit 16, sleeve pipe 17 connections such as grade, pass through marine riser 2 then with release unit 6, buoyancy compartment 4, preventer 5 is lowered under water together, and make preventer 5 be seated ballast tank 7 through top well head 8, connect then and go up flexible joint 3 etc., finish the installation of system, the beginning drillng operation.
The utility model device in use, as when running into emergencies such as typhoon, can the ejection escape operation.When needing to break away from, the utility model device can be implemented to break away from from release unit 6, takes out marine riser 2.Also can turn-off simultaneously the emergency shutdown device 14 of the B of mud line place.
Claims (11)
1, a kind of deepwater drilling device based near surface deviation, it is characterized in that: it comprises a marine riser that is connected with offshore boring island, the centre of described marine riser is provided with flexible joint on, described marine riser passes a buoyancy compartment and is connected with a preventer, described buoyancy compartment upper end is connected with described marine riser by a release unit, described preventer seat is in a top well head, well head below, described top is a ballast tank, the one stress joint upper end that is provided with centralizer is goed deep into being connected with described top well head in the described ballast tank, described stress joint lower end connects a high pressure marine riser, described high pressure marine riser outer setting has buoyant mass, the bottom of high pressure marine riser connects flexible joint down successively, the bottom well head, conduit and sleeve pipe, described conduit and sleeve pipe are fixed in the seabed, described preventer circumferentially and have between the bottom of offshore boring island moon pool opening and be connected with three at least and set upright rope.
2, a kind of deepwater drilling device as claimed in claim 1 based near surface deviation, it is characterized in that: described buoyancy compartment is the airtight metal drum of an elongated cylindrical, have a central shaft hole that vertically runs through described buoyancy compartment along its central axis, the inside of described buoyancy compartment has several airtight cabins.
3, a kind of deepwater drilling device as claimed in claim 1 based near surface deviation, it is characterized in that: described ballast tank is an oval-shaped airtight metal ball body, its central axis has a central shaft hole that vertically runs through described ballast tank, and the inside of described ballast tank has several airtight cabins.
4, a kind of deepwater drilling device as claimed in claim 2 based near surface deviation, it is characterized in that: described ballast tank is an oval-shaped airtight metal ball body, its central axis has a central shaft hole that vertically runs through described ballast tank, and the inside of described ballast tank has several airtight cabins.
5, as claim 1 or 2 or 3 or 4 described a kind of deepwater drilling devices based near surface deviation, it is characterized in that: described preventer is positioned at the following 80～100m place of the water surface.
6, as claim 1 or 2 or 3 or 4 described a kind of deepwater drilling devices based near surface deviation, it is characterized in that: the external diameter of described high pressure marine riser is 16 ".
7, a kind of deepwater drilling device as claimed in claim 5 based near surface deviation, it is characterized in that: the external diameter of described high pressure marine riser is 16 ".
8, as claim 1 or 2 or 3 or 4 described a kind of deepwater drilling devices, it is characterized in that: between described flexible joint down and bottom well head, be provided with a described emergency shutdown device based near surface deviation.
9, a kind of deepwater drilling device based near surface deviation as claimed in claim 5 is characterized in that: be provided with a described emergency shutdown device between described flexible joint down and bottom well head.
10, a kind of deepwater drilling device based near surface deviation as claimed in claim 6 is characterized in that: be provided with a described emergency shutdown device between described flexible joint down and bottom well head.
11, a kind of deepwater drilling device based near surface deviation as claimed in claim 7 is characterized in that: be provided with a described emergency shutdown device between described flexible joint down and bottom well head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720172925XU CN201121487Y (en) | 2007-09-03 | 2007-09-03 | Deepwater drilling device based on near surface deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720172925XU CN201121487Y (en) | 2007-09-03 | 2007-09-03 | Deepwater drilling device based on near surface deviation |
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| Publication Number | Publication Date |
|---|---|
| CN201121487Y true CN201121487Y (en) | 2008-09-24 |
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| CNU200720172925XU Expired - Lifetime CN201121487Y (en) | 2007-09-03 | 2007-09-03 | Deepwater drilling device based on near surface deviation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109269B (en) * | 2007-09-03 | 2010-11-24 | 中国海洋石油总公司 | Deepwater drilling device based on near surface deviation |
| CN108166941A (en) * | 2017-12-25 | 2018-06-15 | 中国石油大学(华东) | A kind of TLP bilayers standpipe is drilled well construction operational method |
| CN111561272A (en) * | 2020-05-26 | 2020-08-21 | 中海石油(中国)有限公司 | Deep water light workover riser system and installation method thereof |
-
2007
- 2007-09-03 CN CNU200720172925XU patent/CN201121487Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109269B (en) * | 2007-09-03 | 2010-11-24 | 中国海洋石油总公司 | Deepwater drilling device based on near surface deviation |
| CN108166941A (en) * | 2017-12-25 | 2018-06-15 | 中国石油大学(华东) | A kind of TLP bilayers standpipe is drilled well construction operational method |
| CN108166941B (en) * | 2017-12-25 | 2020-11-24 | 中国石油大学(华东) | TLP double-layer vertical pipe drilling well completion construction operation method |
| CN111561272A (en) * | 2020-05-26 | 2020-08-21 | 中海石油(中国)有限公司 | Deep water light workover riser system and installation method thereof |
| CN111561272B (en) * | 2020-05-26 | 2021-12-07 | 中海石油(中国)有限公司 | Deep water light workover riser system and installation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080924 Effective date of abandoning: 20070903 |