CN217206335U - High-pressure rotatable water-resisting vertical pipe under shallow water - Google Patents
High-pressure rotatable water-resisting vertical pipe under shallow water Download PDFInfo
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- CN217206335U CN217206335U CN202123126481.5U CN202123126481U CN217206335U CN 217206335 U CN217206335 U CN 217206335U CN 202123126481 U CN202123126481 U CN 202123126481U CN 217206335 U CN217206335 U CN 217206335U
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Abstract
The utility model relates to a high-pressure rotatable riser under shallow water, which comprises a head part, a pipe body and a tail part which are connected in sequence; the head comprises a sealing section and an external thread section, a sealing ring is sleeved on the outer wall of the sealing section, and the external thread section is a multi-start thread; the afterbody includes seal groove and spiral shell groove, the seal groove with the seal segment matches, the spiral shell groove with external screw thread section phase-match. The utility model discloses set up threaded connection structure at head and afterbody, used the bull screw to carry out the high-speed joint, saved installation and time of dismantling, reduced personnel's operation risk, realized unmanned personnel's operation under water and connected and take off one's hand.
Description
Technical Field
The utility model belongs to the technical field of oil gas exploitation, concretely relates to rotatable water proof riser of shallow water underwater high pressure.
Background
With the vigorous development of oil and gas fields in Bohai sea, shallow underwater well heads and Christmas trees are increasingly applied, and how to realize the quick connection of underwater well head devices, blowout preventer groups and riser pipes becomes a new problem. The deepwater riser system is complex, high in cost investment and not suitable for shallow water construction operation in the Bohai sea area. In a conventional ground wellhead riser combination, a variable-pressure variable-diameter flange, bolts and a matched metal steel ring are used for connecting the riser with a wellhead device and a blowout preventer stack.
There are problems if conventional risers are used in shallow water wellhead blowout preventer riser connections. Firstly, the time of underwater operation of divers is limited, and the difficulty of operation and construction is high. Secondly, if the sea state is not good, the diver cannot launch the water to work, the site work can only be in standby, and the work progress is influenced. Thirdly, the pressure-bearing level of the conventional ground wellhead lifting riser is generally 21MPa-34.5MPa, and the pressure level of the underwater wellhead device is 70MPa, so that the conventional ground wellhead lifting riser cannot meet the pressure-bearing standard.
SUMMERY OF THE UTILITY MODEL
In order to solve the whole or partial problem that proposes among the above-mentioned background art, the utility model aims to provide a high pressure rotatable water proof riser under shallow water can realize underwater wellhead assembly, blowout preventer group and water proof riser high-speed joint.
The high-pressure rotatable riser under shallow water according to the utility model comprises a head part, a pipe body and a tail part which are connected in sequence;
the head comprises a sealing section and an external thread section, a sealing ring is sleeved on the outer wall of the sealing section, and the external thread section is a multi-start thread;
the afterbody includes seal groove and spiral shell groove, the seal groove with the seal segment phase-match, the spiral shell groove with external screw thread section phase-match.
Preferably, the head is provided with a plurality of anti-rotation pins at the tail end of the external thread section, and when the two high-pressure rotatable water-resisting vertical pipes under shallow water are connected, the anti-rotation pins can be axially inserted into gaps between the head and other connecting parts.
Preferably, the anti-rotation pin is arc-shaped plate-shaped and provided with a transverse bend, and anti-slip grains are arranged on the surface of the part of the anti-rotation pin inserted into the gap.
Preferably, the head is provided with a limiting protrusion or a limiting groove at the tail end of the external thread section, and the limiting protrusion or the limiting groove limits the anti-rotation pin.
Preferably, the external screw thread section is the toper, sealed section sets up the front end of external screw thread section, the thread is the toper, the seal groove sets up the front end of thread.
Preferably, the tail portion has an outer diameter greater than the outer diameters of the head portion and the tubular body.
Preferably, the multi-start thread has 3-4 starts, and the interval between every two starts is 1-5 cm.
Preferably, the head portion, the tube body and the tail portion are integrally formed, or are separately formed and then fixed by welding.
Preferably, the seal ring is a hydrogenated nitrile rubber seal ring.
Preferably, the pressure bearing grade of the shallow underwater high-pressure rotatable riser is more than 70 Mpa.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model discloses set up threaded connection structure at head and afterbody, carried out the high-speed joint through the bull screw that high bearing, high antitorque, high pressure-bearing, saved the time of installation and dismantlement, reduced personnel's operation risk, realized unmanned aerial vehicle operation under water and connected and take off the hand.
2) The utility model discloses be provided with and prevent changeing the pin, can prevent effectively that water proof riser from going into down or taking off the hand in-process and bearing the reaction torque and throw off.
3) The utility model discloses use high strength material to make to satisfy water proof riser pressure-bearing requirement, use the hydrogenated nitrile rubber sealing washer to realize sealed function, improve corrosion resistance and reuse rate, reduce its use cost.
Drawings
Fig. 1 is a schematic half sectional structural view of a shallow underwater high-pressure rotatable riser according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of fig. 1.
Description of the reference numerals: 1. a pipe body; 2. a head portion; 3. a sealing section; 4. an external threaded section; 5. anti-rotation pins; 6. a tail portion; 7. a sealing groove; 8. and (4) a spiral groove.
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.
Fig. 1 and 2 show an embodiment of the present invention, which is a shallow underwater high-pressure rotatable riser, including a head 2, a pipe body 1, and a tail 6 connected in sequence;
the head 2 comprises a sealing section 3 and an external thread section 4, a sealing ring is sleeved on the outer wall of the sealing section 3, and the external thread section 4 is a multi-start thread;
the tail part 6 comprises a sealing groove 7 and a thread groove 8, the sealing groove 7 is matched with the sealing section 3, and the thread groove 8 is matched with the external thread section 4, so that the head and the tail of the plurality of water-resisting vertical pipes can be connected in a sealing mode.
The water-proof riser of this embodiment has set up threaded connection structure at head 2 and afterbody 6, carries out the high-speed joint through the high bull screw that bears, high antitorque, high pressure-bearing, has saved the time of installation and dismantlement, has reduced personnel's operation risk, has realized unmanned aerial vehicle under water and has operated the connection and take off the hand.
Preferably, the head 2 is provided with a plurality of anti-rotation pins 5 at the end of the external thread section 4, the anti-rotation pins 5 being axially insertable into the gaps between the head 2 and the other connecting parts. The axial direction is the axial direction of the riser, and the anti-rotation pin 5 is arranged, so that the head part 2 is attached to other connecting parts more tightly, and the riser can be effectively prevented from being disengaged due to the fact that the riser bears the reaction torque in the process of running in or disengaging.
For example: when two water-proof vertical pipes are connected, the anti-rotation pin 5 can be axially inserted into a gap between the head part 2 and the tail part 6, and when the anti-rotation pin 5 is connected with a wellhead, the anti-rotation pin can be axially inserted into a gap between the head part 2 and the wellhead for preventing the water-proof vertical pipes from being disengaged due to the fact that the anti-rotation pin bears counter torque in the process of going down or disengaging.
Preferably, the anti-rotation pin 5 is arc-shaped plate-shaped and provided with a transverse bend, and the surface of the part of the anti-rotation pin 5 inserted into the gap is provided with anti-skid grains. The anti-slip patterns can be convex-concave patterns, and the friction force between the riser and other connecting parts can be improved by arranging the anti-slip patterns, so that the riser is effectively prevented from being disengaged due to the fact that the riser bears the reaction torque in the process of running in or disengaging from the hand.
Preferably, the head 2 is provided with a limiting protrusion or a limiting groove at the end of the external thread section 4, and the limiting protrusion or the limiting groove limits the anti-rotation pin 5. The transverse bending of the anti-rotation pin 5 is matched with the limiting protrusion or the limiting groove, so that the anti-rotation pin 5 is effectively prevented from moving.
The anti-rotation pin 5 can be welded and fixed at the position of the limiting bulge or the limiting groove.
As shown in fig. 1 and 2, the external thread section 4 is tapered, the sealing section 3 is disposed at the front end of the external thread section 4, the thread groove 8 is tapered, and the sealing groove 7 is disposed at the front end of the thread groove 8.
The external diameter of afterbody 6 is greater than the external diameter of head 2 and body 1, conveniently sets up seal groove 7 and spiral groove 8 in inside.
Preferably, the multi-start thread has 3 to 4 starts, and the interval between each start is 1 to 5 cm. Compared with the prior art in which the bolts are used for connection, the screwing number of turns of the multi-start thread is one third of the screwing number of turns of the bolts, so that the time for mounting and dismounting is saved.
The head 2, the tube body 1 and the tail 6 can be integrally manufactured or manufactured in a split mode and then fixed through welding. The split type manufacturing mode is adopted, the head part 2 and the tail part 6 are convenient to process, and the manufacturing cost can be reduced.
The sealing ring sleeved on the sealing section 3 can be pressed in the sealing groove 7 to form a sealing structure after the sealing section 3 extends into the sealing groove 7. The sealing ring is preferably a hydrogenated nitrile rubber sealing ring, so that the corrosion resistance and the reuse rate can be improved, and the use cost is reduced.
Preferably, the pressure bearing grade of the shallow underwater high-pressure rotatable riser is more than 70Mpa, and the rotary marine riser is suitable for underwater environment.
And (3) economic benefit analysis:
1. the average water depth of the Bohai sea area is about 23m, the position of a wellhead under shallow water is about 1.5m above a mud line, the position of a self-supporting drilling platform is 38-40m, and the height of the drilling platform surface is about 56 m. The general single effective length of shallow water underwater drilling riser is 11.94m, and the effective length of tensioning lifting short circuit is 6.23 m. The distance from the underwater wellhead to the front of the blowout preventer is about 45m, 4 riser pipes are needed to be drilled, and 1 pup joint is tensioned and lifted to complete the connection between the underwater well and the surface blowout preventer.
2. Traditional flange bolt formula riser pipe cluster is 4 flange faces altogether, 16 bolts of group of single face flange, and every bolt of fastening needs 3 minutes, separates the installation of riser individual well according to 4, dismantles and needs time altogether: 4X16X 3 ═ 768 minutes. And the traditional flange type riser can not realize unmanned underwater installation and disassembly and is not suitable for the use of an underwater wellhead.
3. The high-pressure rotatable riser joint uses multi-head special threads, and the two risers are connected by only rotating 2 circles to meet the buckling requirement. The disassembly of a multi-head special thread only needs 15 minutes, the installation is carried out according to 4 riser single wells, and the disassembly needs 4X 15 to 60 minutes.
4. High pressure rotatable water proof riser quick connect device compares traditional mode, saves time at least: 768-60 or 708 minutes, saving about 11.8 hours of operating time for a single well. According to the Bohai sea oil field well drilling and completion comprehensive daily fee of 80 ten thousand yuan, the underwater wellhead well drilling and completion comprehensive daily fee is about 100 ten thousand yuan, and the single well at least saves the operation fee 100/60X 11.8 which is 19.6 ten thousand yuan.
And (3) social benefit analysis:
1. the Bohai oil and gas field is always the main battlefield of the middle sea oil, and contributes to the trial implementation of 4000 kilotons of plan for increasing storage and increasing production from 7 years of action plan to Bohai oil field. In order to implement the strategy of ' ocean Enhance of China ', increase the oil-gas exploration and development strength and guarantee the completion of an energy safety plan, the Bohai sea oil field develops from a dry wellhead and a pile foundation platform on yesterday ' to an underwater wellhead, a floating platform and an underwater production system on the present. The problem of limited oil and gas exploitation in the Bohai sea area is solved by researching and trial-manufacturing underwater wellheads and domesticating a matched underwater high-pressure rotatable riser system, and the method is also an optimal solution and an industrial trend for enhancing the disaster-resistant environment capacity and reducing the development cost on the sea.
2. The technology of a shallow underwater wellhead and a matched high-pressure rotatable riser is monopolized by a plurality of foreign large-scale companies all the time, more than 1 year of time is consumed, and the developed finished product has the characteristics of light weight and low cost.
3. The domestic research, development and trial production of the underwater high-pressure rotatable riser system fills the blank of shallow-water underwater development of marine oil and gas fields in China, promotes the improvement and reformation of the technical capability of marine oil and gas equipment, continuously improves and increases the technical specification and the quantity of equipment along with the production and scale expansion of projects, continuously expands the application field, and can enhance powerful power for the implementation of the thirteen-five plan.
4. The project is tried on to promote the industrial level, extend the industrial chain, promote the product structure and the technical structure to adjust the research and development and the production of the project product, not only can bring new benefit growth points for companies, but also can drive the development of related industries, and promote the quality and the industrial level of the related products.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
In the description of the present application, it should be understood that the terms "left", "right", "inner", "outer", "axial", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included in the scope of the claims and description of the present invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not intended to be limited to the particular embodiments disclosed herein, but rather to include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A high-pressure rotatable riser under shallow water is characterized by comprising a head part, a pipe body and a tail part which are sequentially connected;
the head comprises a sealing section and an external thread section, a sealing ring is sleeved on the outer wall of the sealing section, and the external thread section adopts a multi-start thread;
the afterbody includes seal groove and spiral shell groove, the seal groove with the seal segment matches, the spiral shell groove with external screw thread section phase-match.
2. The shallow water underwater high-pressure rotatable riser according to claim 1, wherein the head is provided with a plurality of anti-rotation pins at the end of the external threaded section, and the anti-rotation pins can be axially inserted into gaps between the head and other connecting parts.
3. The shallow water underwater high-pressure rotatable riser according to claim 2, wherein the rotation-preventing pin is arc-shaped plate-shaped and has a transverse bend, and the surface of the portion inserted into the gap of the rotation-preventing pin is provided with anti-slip lines.
4. The shallow water underwater high-pressure rotatable riser according to claim 3, wherein the head is provided with a limiting protrusion or a limiting groove at the end of the external thread section, and the limiting protrusion or the limiting groove limits the rotation-preventing pin.
5. The rotatable riser of claim 1, wherein the external thread section is conical, the sealing section is arranged at the front end of the external thread section, the thread is conical, and the sealing groove is arranged at the front end of the thread.
6. The shallow underwater high pressure rotatable riser of claim 1 wherein the tail section has an outer diameter greater than the outer diameter of the head section and the pipe body.
7. The shallow underwater high pressure rotatable riser of claim 1 wherein the multiple thread ends are 3-4 thread ends with a 1-5cm spacing between each end.
8. The shallow underwater high pressure rotatable riser according to claim 1 wherein the head, the pipe body and the tail are integrally formed or separately formed and then secured by a welded connection.
9. The shallow water underwater high pressure rotatable riser of claim 1 wherein said seal is a hydrogenated nitrile rubber seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123126481.5U CN217206335U (en) | 2021-12-13 | 2021-12-13 | High-pressure rotatable water-resisting vertical pipe under shallow water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123126481.5U CN217206335U (en) | 2021-12-13 | 2021-12-13 | High-pressure rotatable water-resisting vertical pipe under shallow water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217206335U true CN217206335U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123126481.5U Active CN217206335U (en) | 2021-12-13 | 2021-12-13 | High-pressure rotatable water-resisting vertical pipe under shallow water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217206335U (en) |
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2021
- 2021-12-13 CN CN202123126481.5U patent/CN217206335U/en active Active
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