CN113464053A - Underwater small-sized wellhead coiled tubing drilling system - Google Patents
Underwater small-sized wellhead coiled tubing drilling system Download PDFInfo
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- CN113464053A CN113464053A CN202110645131.5A CN202110645131A CN113464053A CN 113464053 A CN113464053 A CN 113464053A CN 202110645131 A CN202110645131 A CN 202110645131A CN 113464053 A CN113464053 A CN 113464053A
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- coiled tubing
- drilling
- drilling fluid
- wellhead
- small
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/24—Guiding or centralising devices for drilling rods or pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
Abstract
The invention provides an underwater small-sized wellhead coiled tubing drilling system which comprises a floating drilling platform, a coiled tubing drilling mechanism and a drilling fluid backflow unit, wherein the coiled tubing drilling mechanism comprises a coiled tubing winch, a coiled tubing lead-in device, a drilling fluid volume control unit, a coiled tubing blowout preventer and a small wellhead base plate; the drilling fluid backflow unit is also fixed on the small wellhead base plate, and the drilling fluid volume control unit is communicated with the drilling fluid backflow unit through a drilling fluid backflow hose; the underwater small-sized wellhead coiled tubing drilling system enables drilling fluid to be recycled, and is beneficial to miniaturization of a drilling platform.
Description
Technical Field
The invention relates to the field of exploration drilling, in particular to an underwater small wellhead coiled tubing drilling system.
Background
In the marine geological exploration drilling operation, the conventional drilling mode is generally used, namely a marine riser and a conventional drill pipe are used, the drilling mode is carried out on a large drilling platform or a drilling ship, and the conventional drilling operation is complex in procedure and consumes a large amount of time and economic cost. The sea geological exploration well drilling is mostly a small well hole, and the use of a conventional well drilling large well hole causes huge waste.
Disclosure of Invention
Based on this, this drilling system need not to use the drilling riser, is fit for the drilling system of small-size boats and ships for the drilling system no longer receives the restriction of drilling platform or drilling ship size, simplifies the drilling procedure, can carry out small-size well marine geological exploration operation by flexibility efficient.
In order to solve the technical problems, the invention provides an underwater small-wellhead coiled tubing drilling system which comprises a floating drilling platform, a coiled tubing drilling mechanism and a drilling fluid backflow unit, wherein the coiled tubing drilling mechanism comprises a coiled tubing winch, a coiled tubing lead-in device, a drilling fluid volume control unit, a coiled tubing blowout preventer and a small-wellhead basal disc, the coiled tubing underwater blowout preventer is fixed on the small-wellhead basal disc, and the drilling fluid volume control unit is fixed on the coiled tubing underwater blowout preventer; the drilling fluid backflow unit is also fixed on the small wellhead base plate, and the drilling fluid volume control unit is communicated with the drilling fluid backflow unit through a drilling fluid backflow hose; the coiled tubing drilling mechanism further comprises a low-pressure wellhead section, a guide pipe, a high-pressure wellhead section and a surface casing, wherein the low-pressure wellhead section, the guide pipe, the high-pressure wellhead section and the surface casing are pre-installed on the small wellhead base plate during drilling.
As a further preference of the above embodiment, the coiled tubing lead-in device includes a coiled tubing above-water lead-in device and a coiled tubing underwater lead-in device, when in use, the coiled tubing above-water lead-in device is disposed near the coiled tubing winch, the coiled tubing underwater lead-in device is butted with the drilling fluid volume control unit, and the coiled tubing coiled on the coiled tubing winch is led into the coiled tubing underwater blowout preventer through the coiled tubing above-water lead-in device and the coiled tubing underwater lead-in device.
As a further preferable mode of the above embodiment, a hole-opening adjusting mechanism is disposed in the coiled tubing underwater lead-in device, and the hole-opening adjusting mechanism can adjust the opening degree of the coiled tubing underwater lead-in device, so that the drilling tool, the wellhead equipment and the coiled tubing can all pass through the coiled tubing underwater lead-in device.
As a further optimization of the embodiment, the drilling fluid volume control device further comprises a translation mechanism, the translation mechanism is connected to the upper part of the drilling fluid volume control unit, the coiled tubing underwater lead-in device is arranged on the translation mechanism, and the coiled tubing underwater lead-in device can be driven to move through the translation mechanism.
As a further preferred embodiment of the above embodiment, the underwater small wellhead coiled tubing drilling system operates to form a borehole, the borehole is communicated with seawater, drilling fluid and seawater contact in the drilling fluid volume control unit to form a contact surface, a differential pressure sensor is fixed on the drilling fluid volume control unit, the differential pressure sensor is connected with the drilling fluid backflow unit, and when the differential pressure sensor detects that the differential pressure exceeds a preset range, the drilling fluid backflow unit pumps out excess drilling fluid.
As a further preferable mode of the above embodiment, the coiled tubing blowout preventer is provided with a kill line hot stab sub and a choke line hot stab sub, and the kill line hot stab sub and the choke line hot stab sub are connected to the emergency disconnect module through cables.
As a further preference of the above embodiment, the coiled tubing drilling mechanism further comprises a low pressure wellhead section, a conduit, a high pressure wellhead section and a surface casing, the low pressure wellhead section, the conduit, the high pressure wellhead section and the surface casing being pre-installed on the mini wellhead template during drilling.
As a further preference of the above embodiment, the drilling fluid return unit includes a drilling fluid return pump, and the drilling fluid return pump is connected to the drilling fluid volume control unit through a drilling fluid return hose; the upper part of the drilling fluid backflow unit is connected with an emergency disconnection module, the emergency disconnection module comprises a male head substrate module and a female head substrate module, and the male head substrate module is spliced with the female head substrate module; the underwater small-wellhead coiled tubing drilling system further comprises a translation mechanism, wherein the translation mechanism comprises a fixed plate and a telescopic unit, the translation mechanism is fixed on the drilling fluid volume control unit, the coiled tubing underwater lead-in device is arranged on the fixed plate, and the telescopic unit is connected with the coiled tubing underwater lead-in device so as to drive the coiled tubing underwater lead-in device to move.
As a further preference of the above embodiment, an emergency disconnection module is connected to the upper part of the drilling fluid return unit, and the emergency disconnection module is detachably connected to the drilling fluid return unit; the emergency disconnection module is connected with a hose bundle, and the other end of the hose bundle extends to the sea surface and is connected with the floating drilling platform.
As a further preference of the above embodiment, the hose bundle comprises a cable, a drilling fluid pipe and an emergency disconnect wireline by which the hose bundle is tensioned in use to disconnect the emergency disconnect module from the drilling fluid return unit.
The underwater small-sized wellhead coiled tubing drilling system adopts a mode of independently arranging the drilling fluid backflow unit, so that the drilling fluid can be recycled, the miniaturization of a drilling platform is facilitated, and the pollution to seawater is avoided; when drilling, because the conventional drilling riser and the conventional drill pipe are not needed, deep water drilling can be carried out by a smaller floating drilling ship, and the economic benefit is very remarkable.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic diagram of the overall construction of a drilling system in accordance with a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of the coiled tubing drilling mechanism of the preferred embodiment of the present invention;
FIG. 3 is a connection block diagram of the coiled tubing drilling mechanism and the drilling fluid return unit of the preferred embodiment of the present invention;
FIG. 4 is a detailed structural diagram of the coiled tubing subsea blowout preventer docked in a drilling fluid volume control unit;
FIG. 5 is a detailed block diagram of the coiled tubing subsea blowout preventer with the coiled tubing removed;
FIG. 6 is a schematic view of a coiled tubing subsea lead-in device changing from a small opening to a large opening;
FIG. 7 is an enlarged view of the coiled tubing subsea lead in device of FIG. 6;
fig. 8 is a schematic structural diagram of the coiled tubing drilling mechanism mounted on a small wellhead template.
In the figure: 1. a water surface; 2. a seabed; 3. seawater; 4. a floating drilling vessel; 5. a coiled tubing; 6. a drilling fluid volume control unit; 7. coiled tubing subsea blow out preventers; 8. a wellbore; 9. a small wellhead template; 10. a male substrate module; 11. a mother substrate module; 12. an emergency disconnect module; 13. a hose bundle; 14. a wire rope; 15. a coiled tubing underwater lead-in device; 16. a coiled tubing water lead-in device; 17. pulling up; 18. a drilling fluid return hose; 19. a coiled tubing winch; 20. a coiled tubing bend limiter; 21. lifting a tension force; 22. lifting and adjusting the continuous oil pipe; 23. a translation mechanism; 24. a kill line hot stab sub; 25. a choke line hot stab connection; 26. a differential pressure sensor; 27. a blowout preventer; 28. a blowout preventer control panel; 29. a drilling fluid return pump; 30. a high-pressure wellhead head; 31. a coiled tubing upper guide head; 32. a camera device; 33. a differential pressure sensor; 34. a drill stem; 35. wellhead casing equipment; 36. a large diameter casing; 37. clamping the roller; 38. a chain; 39. a guiding head at the lower part of the continuous oil pipe; 40. a telescopic unit; 41. a low-pressure wellhead head; 42. a conduit; 43. a packer; 44. a surface casing; 45. a chain assembly; 46. a contact surface.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-8, the present invention provides an underwater small wellhead coiled tubing drilling system comprising a floating rig, which may be a floating drill ship or simply a floating drilling platform floating on the sea surface, a coiled tubing drilling mechanism, and a drilling fluid return unit. Referring to fig. 1, a floating drilling vessel 4 or platform floats on the water surface 1 for deployment and operation of an underwater small wellhead coiled tubing drilling system. The coiled tubing drilling mechanism comprises a coiled tubing winch, a coiled tubing lead-in device, a drilling fluid volume control unit, a coiled tubing blowout preventer and a small wellhead base plate, wherein the small wellhead base plate is fixed on the seabed 2, the coiled tubing underwater blowout preventer 7 is fixed on the small wellhead base plate 9, and the drilling fluid volume control unit 6 is fixed on the coiled tubing underwater blowout preventer 7. The drilling fluid backflow unit is also fixed on the small wellhead base plate 9, the drilling fluid volume control unit 6 is communicated with the drilling fluid backflow unit through the drilling fluid backflow hose 18, the drilling fluid can be recycled through the drilling fluid backflow hose, and the recycled drilling fluid can be reused, so that the floating drilling platform does not need to bear excessive drilling fluid, the occupation of the drilling fluid is reduced, and in addition, in the operation process, the drilling fluid does not need to be discharged into the sea, and the pollution to the surrounding environment is avoided. The coiled tubing drilling mechanism is mounted on a small wellhead template 9 to be deployed from the floating drilling vessel 4 by a marine crane. A coiled tubing drawworks 19 with a control system is mounted on the vessel deck. The coiled tubing drilling mechanism may be pre-installed on the mini wellhead template 9 prior to deployment. The coiled tubing underwater blowout preventer 7 in the open water area is provided with a drilling fluid volume control unit 6 and a coiled tubing underwater lead-in device 15 with a control system, and is connected to a small high-pressure wellhead head 30. The gate valve installed on the open water coiled tubing subsea blowout preventer 7 may be generally provided as: the device comprises an underwater casing pipe/drill rod shearing sealing gate valve, an underwater continuous oil pipe shearing sealing gate valve, an underwater reducing gate valve and an underwater continuous oil pipe holding and sealing gate valve. The small-sized drilling system and the small-sized wellhead template are used for exploration equipment, and the small-sized drilling system and the small-sized wellhead template mean that the equipment is smaller than that used for formal oil production, so that the cost can be saved. The drilling system does not need to use a marine riser, is suitable for the drilling system of a small ship, is not limited by the size of a drilling platform or a drilling ship any more, simplifies the drilling procedure, can flexibly and efficiently carry out small-hole marine geological exploration operation, and has a well control function.
Referring to fig. 2, as a further preference of the above embodiment, the coiled tubing lead-in device includes a coiled tubing above water lead-in device 16 and a coiled tubing below water lead-in device 15. The coiled tubing overwater guiding device 16 pulls the coiled tubing to apply an upward pulling force 17 to the coiled tubing 5, and the coiled tubing underwater guiding device 15 is provided with a coiled tubing upper guiding head 31 at the upper part and a coiled tubing lower guiding head 39 at the lower part. When the coiled tubing underwater guiding device is used, the coiled tubing overwater guiding device 16 is arranged close to the coiled tubing winch 19, the coiled tubing underwater guiding device 15 is in butt joint with the drilling fluid volume control unit 6, and the coiled tubing 5 wound on the coiled tubing winch 19 is guided into the coiled tubing underwater blowout preventer 7 through the coiled tubing overwater guiding device 16 and the coiled tubing underwater guiding device 15. The coiled tubing over water lead 16 includes a coiled tubing bend limiter 20, the coiled tubing bend limiter 20 for preventing the coiled tubing from breaking, the coiled tubing over water lead 16 being connected to a tension compensator of the marine drilling system. The coiled tubing above water lead-in device 16 and the coiled tubing below water lead-in device 15 have a control function so that the coiled tubing 5 between the coiled tubing above water lead-in device 16 and the coiled tubing below water lead-in device 15 is always in a tensioned state.
Referring to fig. 6 and 7, as a further preferred embodiment of the above embodiment, a hole-opening adjusting mechanism is disposed in the coiled tubing underwater introduction device 15, and the hole-opening adjusting mechanism can adjust the opening degree of the coiled tubing underwater introduction device 15, so that the drilling tool, the wellhead equipment and the coiled tubing can pass through the coiled tubing underwater introduction device 15. The tapping adjusting mechanism comprises a clamping roller 37 and a chain assembly 38, wherein the chain assembly 38 drives the clamping roller 37 to rotate, so that the coiled tubing 5 can be driven to move up and down in the borehole and seawater. The coiled tubing above water lead-in 16 is intended to provide a lifting tension 21 of the coiled tubing acting in the sea water at all times, and the coiled tubing below water lead-in 15 is intended to adjust the coiled tubing up and down 22. The coiled tubing subsea lead in 15 is provided with pinch rollers 37 and a chain assembly 38 and is mounted above the open water coiled tubing subsea blowout preventer 7. Further, the coiled tubing subsea lead-in device 15 is provided with two sets of retractable clamping rollers 37 and chains 38, the two sets of clamping rollers 37 and chains 38 are arranged opposite to each other, and the opening degree between the two sets of clamping rollers 37 and chains 38 can be adjusted by adjusting the distance between the two sets of clamping rollers 37 and chains, the small opening degree can be adapted to the small-size outer diameter of the coiled tubing 5, and a large opening degree is provided when the clamping rollers 37 and chains 38 are retracted (i.e., moved in the direction away from each other), so that the wellhead casing equipment 35 with the large-size outer diameter can freely pass through the coiled tubing subsea lead-in device 16. Because the open water coiled tubing subsea lead-in 15 no longer needs to be disconnected from the system when large scale drilling, casing and wellhead equipment installations are performed.
Referring to fig. 5, as a further preferred embodiment of the above embodiment, the drilling system further includes a translation mechanism 23, the translation mechanism 23 is connected to the upper portion of the drilling fluid volume control unit 6, and the coiled tubing underwater lead-in device 15 is arranged on the translation mechanism 23, and the coiled tubing underwater lead-in device can be driven to move by the translation mechanism. The coiled tubing subsea lead-in 15 can also be removed by the translation mechanism 23 with the telescoping unit 40, allowing the large-sized wellhead casing device 35, the large diameter casing 36 to be passed through the sea water from the floating drilling vessel 4 into the wellbore through the drill pipe 34 without restriction, and the coiled tubing subsea lead-in 15 can then be moved back to the coiled tubing operation center position for continued drilling operations.
Referring to fig. 8, as a further preferred embodiment of the foregoing embodiment, the underwater small wellhead coiled tubing drilling system operates to form a borehole 8, the borehole 8 is communicated with seawater 3, the drilling fluid and the seawater 3 contact in the drilling fluid volume control unit 6 to form a contact surface 46, a differential pressure sensor 33 is fixed on the drilling fluid volume control unit 6, the differential pressure sensor 33 is connected with a drilling fluid backflow unit, and when the differential pressure sensor 33 detects that the differential pressure exceeds a preset range, the drilling fluid backflow unit pumps out excess drilling fluid, so as to adjust the amount of the drilling fluid. Above the coiled tubing subsea blowout preventer 7 a drilling fluid volume control unit 6 is installed in order to keep the wellbore 8 always filled with drilling fluid. The drilling fluid volume control unit 6 is in communication with the seawater 3, allowing a hydrostatic pressure gradient of seawater at standard atmospheric pressure to act on the top of the wellbore 8, forcing drilling fluid into the drilling fluid return line 27 to the drilling fluid return pump 29, where it is pumped by the pump 29 into the drilling fluid return line in the tensioning umbilical and hose bundle 13. The height of the sea water and drilling fluid contact surface 46 inside the drilling fluid volume control unit 6 is controlled by one or more drilling fluid return pumps 29, and the control system receives a drilling fluid level height signal sent by a differential pressure sensor 26 located in the drilling fluid volume control unit 6 and adjusts the flow rate of the drilling fluid return pumps 29 in real time. The sensor measures the static pressure inside and outside the drilling fluid volume control unit 6. Only the seawater pressure gradient exists outside the drilling fluid volume control unit 6, while the pressure gradient inside the drilling fluid volume control unit 6 consists of two parts, namely the seawater pressure gradient above the drilling fluid and seawater contact surface 46, and the drilling fluid pressure gradient below the contact surface 46 from the contact surface 46 to the installation position of the differential pressure sensor in the drilling fluid volume control unit 6. In this way, the drilling fluid level 46 in the drilling fluid volume control unit 6 can be determined accurately at any time.
Referring to figure 6, as a further preference to the above embodiment, there is an open area between the drilling fluid volume control unit 6 and the coiled tubing subsea lead in 15, which is equipped with a camera 32 to monitor all drilling equipment entering the coiled tubing subsea blowout preventer 7.
Referring to fig. 4, as a further preference of the above embodiment, the coiled tubing blowout preventer 7 is provided with a kill line hot stab sub 24 and a choke line hot stab sub 25, and the kill line hot stab sub 24 and the choke line hot stab sub 25 are connected to the emergency disconnect module 12 by cables. The high pressure choke and circulation lines are arranged on the coiled tubing subsea blow out preventer 7. The kill line hot stab sub 24 and choke line hot stab sub 25 may be connected directly to the well control lines from the floating drilling vessel 4 as a backup function in the event that the main well control lines fail or are otherwise unavailable.
Referring to fig. 8, as a further preferred embodiment of the above embodiment, the coiled tubing drilling mechanism further includes a low-pressure wellhead head 41, a conduit 42, a high-pressure wellhead head 30 and a surface casing 44, when drilling, the low-pressure wellhead head 41, the conduit 42, the high-pressure wellhead head 30 and the surface casing 44 are pre-installed on the small wellhead base plate 9, and the installation sequence and installation method of the low-pressure wellhead head 41, the conduit 42, the high-pressure wellhead head 30 and the surface casing 44 are common knowledge in the art, and are not described herein again, and in addition, the connection sequence of the low-pressure wellhead head 41, the conduit 42, the high-pressure wellhead head 30 and the surface casing 44 can also be clearly seen from fig. 8. Specifically, the mini wellhead template 9, together with the pre-assembled low pressure wellhead head 41, conduit 42 and pre-assembled mini wellhead high pressure wellhead head 30 with mini wellhead surface casing 44, comprise the mini wellhead template. A packer 43 is installed between the low pressure wellhead section 41 and the small wellhead high pressure wellhead section 30 to prevent shallow gas from being able to build up in the drilling of weak formations above the seabed.
As a further preference of the above embodiment, with reference to fig. 3, the drilling fluid return unit comprises a drilling fluid return pump 29, the drilling fluid return pump 29 being connected to the drilling fluid volume control unit 6 via a drilling fluid return hose 18; the upper part of the drilling fluid backflow unit is connected with an emergency disconnection module 12, the emergency disconnection module 12 comprises a male substrate module 10 and a female substrate module 11, and the male substrate module 10 is inserted into the female substrate module 11; the underwater small-wellhead coiled tubing drilling system further comprises a translation mechanism 23, the translation mechanism 23 comprises a fixing plate and a telescopic unit 40, the telescopic unit 40 can be an automatic telescopic rod, the translation mechanism 23 is fixed on the drilling fluid volume control unit 6, the coiled tubing underwater lead-in device 15 is arranged on the fixing plate, and the telescopic unit 40 is connected with the coiled tubing underwater lead-in device so as to drive the coiled tubing underwater lead-in device to move.
Referring to fig. 3, as a further preferred embodiment of the above embodiment, an emergency disconnection module 12 is connected to the upper part of the drilling fluid return unit, and the emergency disconnection module 12 is detachably connected to the drilling fluid return unit; the emergency disconnect module 12 is connected to a hose bundle 13 and an umbilical, the other end of the hose bundle 13 extending above the sea surface and being connected to the floating rig floor.
Referring to figure 3, as a further preferred embodiment of the above described embodiment, the hose bundle comprises a cable, a drilling fluid return hose 18 and a wireline 14 for emergency disconnection, and in use the emergency disconnection module 12 is disconnected from the drilling fluid return unit by tightening the hose bundle via the wireline 14. Further, the hose bundle 13 generally includes: the system comprises a steel wire rope 14, a high-pressure kill line well control hose, a high-pressure throttle line well control hose, a drilling fluid return hose, a blowout preventer control umbilical cable, a drilling fluid return pump power umbilical cable, other umbilical cables and hoses required by the drilling operation of an underwater small-sized wellhead continuous oil pipe and the like; the wireline 14 is always in tension for emergency disconnection so that the tensioning umbilical and hose bundle 13 can be released from the small wellhead template 9 at any time. The blowout preventer control umbilical is used to transmit control signals and hydraulic supply, control the operation of the coiled tubing subsea lead in 15, control the drilling fluid volume control unit 6, control the blowout preventer 7, and control the drilling fluid return pump 29. In addition, a blowout preventer jumper umbilical is provided between the blowout preventer control panel 28 on the coiled tubing subsea blowout preventer and the emergency disconnect female base plate module 11; a high-pressure hose is arranged between the emergency disconnection female head base plate module 11 and the kill line hot stab connector 24 and the throttle line hot stab connector 25; the drilling fluid volume control unit 6 and the emergency disconnection female head substrate module 11 are provided with volume control signal umbilicals for transmitting signals of the camera unit 32 and the differential pressure sensor unit 33, and are also provided with drilling fluid return hoses.
The underwater small-sized wellhead coiled tubing drilling system adopts a mode of independently arranging the drilling fluid backflow unit, so that the drilling fluid can be recycled, the miniaturization of a drilling platform is facilitated, and the pollution to seawater is avoided; when drilling, because the conventional drilling riser and the conventional drill pipe are not needed, deep water drilling can be carried out by a smaller floating drilling ship, and the economic benefit is very remarkable.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. The underwater small-wellhead coiled tubing drilling system is characterized by comprising a floating drilling platform, a coiled tubing drilling mechanism and a drilling fluid backflow unit, wherein the coiled tubing drilling mechanism comprises a coiled tubing winch, a coiled tubing lead-in device, a drilling fluid volume control unit, a coiled tubing blowout preventer and a small-wellhead basal disc, the coiled tubing underwater blowout preventer is fixed on the small-wellhead basal disc, and the drilling fluid volume control unit is fixed on the coiled tubing underwater blowout preventer; the drilling fluid backflow unit is also fixed on the small wellhead base plate, and the drilling fluid volume control unit is communicated with the drilling fluid backflow unit through a drilling fluid backflow hose; the coiled tubing drilling mechanism further comprises a low-pressure wellhead section, a guide pipe, a high-pressure wellhead section and a surface casing, wherein the low-pressure wellhead section, the guide pipe, the high-pressure wellhead section and the surface casing are pre-installed on the small wellhead base plate during drilling.
2. The subsea small wellhead coiled tubing drilling system of claim 1, wherein the coiled tubing lead in comprises a coiled tubing above water lead in disposed proximate the coiled tubing drawworks and a coiled tubing subsea lead in disposed in abutting relation to the drilling fluid volume control unit, the coiled tubing coiled around the coiled tubing drawworks leading through the coiled tubing above water lead in and the coiled tubing subsea lead in to the coiled tubing subsea blowout preventer.
3. The subsea small wellhead coiled tubing drilling system of claim 2, wherein a bore adjustment mechanism is provided within the coiled tubing subsea lead in, the bore adjustment mechanism being capable of adjusting the opening of the coiled tubing subsea lead in such that a drilling tool, wellhead equipment, and coiled tubing can pass through the coiled tubing subsea lead in.
4. The subsea small wellhead coiled tubing drilling system of claim 2, further comprising a translation mechanism coupled to an upper portion of the drilling fluid volume control unit, the coiled tubing subsea lead-in device being disposed on the translation mechanism, the coiled tubing subsea lead-in device being movable by the translation mechanism.
5. The subsea small wellhead coiled tubing drilling system of claim 1, wherein the subsea small wellhead coiled tubing drilling system is operable to form a wellbore, the wellbore is in communication with seawater, drilling fluid and seawater contact to form a contact surface in the drilling fluid volume control unit, a differential pressure sensor is affixed to the drilling fluid volume control unit, the differential pressure sensor is connected to the drilling fluid return unit, and the drilling fluid return unit pumps excess drilling fluid when the differential pressure sensor detects a differential pressure exceeding a predetermined range.
6. The subsea small wellhead coiled tubing drilling system of claim 1, wherein a kill line hot stab sub and a choke line hot stab sub are provided on the coiled tubing blowout preventer, the kill line hot stab sub and the choke line hot stab sub being connected to the emergency disconnect module by a cable.
7. The subsea small wellhead coiled tubing drilling system of claim 1, wherein the coiled tubing drilling mechanism further comprises a low pressure wellhead head, a conduit, a high pressure wellhead head, and a surface casing, the low pressure wellhead head, conduit, high pressure wellhead head, and surface casing being pre-installed on the small wellhead template while drilling.
8. The subsea small wellhead coiled tubing drilling system of claim 1, wherein the drilling fluid return unit comprises a drilling fluid return pump connected to the drilling fluid volume control unit by a drilling fluid return hose; the upper part of the drilling fluid backflow unit is connected with an emergency disconnection module, the emergency disconnection module comprises a male head substrate module and a female head substrate module, and the male head substrate module is spliced with the female head substrate module; the underwater small-wellhead coiled tubing drilling system further comprises a translation mechanism, wherein the translation mechanism comprises a fixed plate and a telescopic unit, the translation mechanism is fixed on the drilling fluid volume control unit, the coiled tubing underwater lead-in device is arranged on the fixed plate, and the telescopic unit is connected with the coiled tubing underwater lead-in device so as to drive the coiled tubing underwater lead-in device to move.
9. The subsea small wellhead coiled tubing drilling system of any of claims 1-8, wherein an emergency disconnect module is connected to an upper portion of the drilling fluid return unit, the emergency disconnect module being removably connected to the drilling fluid return unit; the emergency disconnection module is connected with a hose bundle, and the other end of the hose bundle extends to the sea surface and is connected with the floating drilling platform.
10. A subsea small wellhead coiled tubing drilling system as claimed in claim 9, wherein the hose bundle comprises a cable, a drilling fluid pipe and an emergency disconnect wireline by which, in use, the hose bundle is tensioned to disconnect the emergency disconnect module from the drilling fluid return unit.
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