Deepwater-crushing-resistant marine drilling riser and manufacturing process thereof

Abstract

The invention relates to the technical field of marine drilling marine risers, and discloses a deepwater crushing resistant marine drilling marine riser which comprises a marine riser body, a first flange plate is fixedly connected to the top of the marine riser body, a second flange plate is fixedly connected to the bottom of the marine riser body, and a grouting pipe is fixedly connected to the right side of the marine riser body. An auxiliary grouting mechanism is arranged at the top of the grouting pipe, a movable mounting mechanism is arranged in a second flange plate, in the using process, through movement of a sliding rod and cooperation with a second spring, locking and limiting between the second flange plate and other equipment are conveniently achieved, the workload of workers on the seabed is reduced, and the working efficiency is improved; the compression and release of the first spring are realized by matching with the fixing block, so that the requirements of marine drilling working conditions are conveniently met, the reduction of compressive strength caused by the Bauschinger effect is inhibited through the optimal design of the components and the structure of the pipe, and the compressive strength is improved by controlling the welding parameters.

Description

Technical Field

[0001] The invention relates to the technical field of marine drilling risers, in particular to a deepwater crush resistant marine drilling riser and a manufacturing process thereof. Background Art

[0002] The offshore riser is a casing that goes from the offshore drilling platform to the shallow seabed. It is a safe passage to isolate seawater and circulate mud during drilling operations. It is connected to the deflector at the top and the blowout preventer at the bottom. It is an important set of underwater drilling equipment. As an important equipment unit for deep-water marine oil and gas exploration and development, the offshore drilling riser is an important and weak link in the entire drilling system in the exploration of marine oil and gas, and is an important factor affecting offshore drilling safety.

[0003] Since stability failure of deepwater drilling risers in extreme deep-sea environments is their main mode of destruction, once local crushing occurs, it will induce buckling propagation, leading to overall failure of the pipeline with very serious consequences. Therefore, preventing pipeline crush failure is essential to ensure the safety of deep-sea structures. At the same time, the drilling fluid booster replenishment devices used in existing drilling riser systems all achieve communication and connection between the drilling fluid auxiliary pipeline and the riser main body by adding an independent gate valve device to the riser auxiliary pipeline, which results in an increase in the number of sealing points in the entire flow channel and increases the risk. Summary of the invention

[0004] The object of the present invention is to provide a deepwater crush resistant marine drilling riser and a manufacturing process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a deepwater crush resistant marine drilling riser, comprising a riser body, a first flange fixedly connected to the top of the riser body, a second flange fixedly connected to the bottom of the riser body, a grouting pipe fixedly connected to the right side of the riser body, an auxiliary grouting mechanism arranged on the top of the grouting pipe, and a movable mounting mechanism arranged inside the second flange.

[0006] Preferably, the auxiliary grouting mechanism includes a connecting pipe, the connecting pipe is fixedly connected to the top of the grouting pipe, the top of the connecting pipe is fixedly connected to a third flange, the inside of the connecting pipe is fixedly connected to a fixed block, the top of the fixed block is fixedly connected to a first spring, the top of the first spring is fixedly connected to a movable block, and the inside of the connecting pipe is fixedly connected to a limiting ring, which facilitates locking and limiting between the second flange and other equipment, reduces the workload of staff on the seabed, and increases work efficiency.

[0007] Preferably, the movable block is in contact with a limiting ring, grooves are provided at positions corresponding to the connecting tube and the movable block, and the movable block is slidably connected inside the groove, so that the connection process is more stable.

[0008] Preferably, the movable mounting mechanism includes a screw, which is arranged inside the second flange, with a connecting block fixedly connected to the top of the screw, a limiting sleeve threadedly connected to the outside of the screw, a second spring fixedly connected to the inside of the screw, a sliding rod fixedly connected to the top of the second spring, and a rotating block rotatably connected to the inside of the screw, so as to adapt to the requirements of marine drilling conditions, increase the pressure and replenish the drilling fluid in the watertight pipe body, so as to speed up the reflux speed of the broken rock saltpeter in the watertight pipe body, and the drilling fluid has a unidirectional conduction effect, thereby improving the drilling efficiency.

[0009] Preferably, the slide rod is in contact with the rotating block, grooves are provided at corresponding positions of the screw rod and the slide rod, and the slide rod is slidably connected inside the groove, so as to make the grouting process more stable.

[0010] A manufacturing process for a deepwater crush resistant marine drilling riser comprises the following steps: S1. Material preparation First of all, the deepwater crush resistant marine drilling riser needs to determine the appropriate raw material ratio. During processing, the appropriate element ratio is determined according to the required magnetic properties and process requirements, and fine measurement is performed; S2. Molten Steel Refining The raw materials to be processed are introduced into an electric arc furnace for smelting to obtain molten steel, and then the obtained molten steel is heated by electric arc and stirred by argon gas under vacuum for degassing; S3, Ingot Casting When pouring molten steel, an inert gas is blown into the sliding nozzle to even out the composition and temperature and purify the molten steel. The poured ingot is slowly cooled in the pit for no less than 48 hours. S4, Processing and Forming When forging steel ingots, allowances for cutting heads and tails must be left, and the forging ratio must be no less than 3.5. After forging, it must be annealed and rolled to obtain the shape of a steel pipe. The pipe blank is then pre-welded and welded using an internal and external multi-wire submerged arc welding process.

[0011] Preferably, in step S1, the deepwater crush resistant marine drilling riser comprises the following raw materials in weight percentage ratio: C: 0.055-0.065%, Si: 0.18-0.21%, Mn: 1.65-1.78%, P≤0.01%, S≤0.002%, Alt: 0.02-0.04%, Nb: 0.050-0.066%, Ti: 0.01-0.018%, Ni: 0.09-0.15%, Cr: 0.18-0.22%, Cu: 0.09-0.15%, Mo: 0.09-0.14%, and the remainder is Fe and unavoidable impurity elements.

[0012] Preferably, in step S2, the raw material heating temperature is controlled at 1160-1180°C, the total raw material in-furnace time is controlled at 150-250min, the soaking section insulation time is ≥30min, the temperature uniformity of the raw material thickness direction is ensured, and the technical requirements for controlling the gas content of the steel grade are: H≤2ppm, O≤20ppm, N≤100ppm, S≤0.010%.

[0013] Preferably, in step S4, during the rolling process, two-stage controlled rolling is adopted, the rough rolling stage is rolled in the austenite recrystallization zone, and the finishing rolling stage is rolled in the austenite non-recrystallization zone; the temperature in the rough rolling stage is controlled at 1060-1030°C, the single-pass reduction rate of the rough rolling longitudinal rolling is controlled at 12-35%, the starting rolling temperature in the finishing rolling stage is 860-890°C, the final rolling temperature is 800-830°C, and the total reduction rate in the finishing rolling stage is 66-75%, and then the surface of the obtained steel tube-shaped steel material is machined and polished, and in the process of welding and connecting the steel pipe with other related structures, a groove design is adopted, and the quick connector and the steel pipe to be welded are aligned through an external alignment device, and a 45° V-shaped groove is formed between the quick connector and the steel pipe.

[0014] Compared with the prior art, the present invention provides a deepwater crush resistant marine drilling riser and a manufacturing process thereof, which has the following beneficial effects: 1. The deepwater crush resistant marine drilling riser and its manufacturing process, through the auxiliary grouting mechanism, during use, through the movement of the set slide rod, in conjunction with the second spring, it is convenient to achieve locking and limiting between the second flange and other equipment, thereby reducing the workload of workers on the seabed and increasing work efficiency.

[0015] 2. The deepwater crush resistant marine drilling riser and its manufacturing process, through the provision of a movable installation mechanism, during use, through the movement of the provided movable block, cooperate with the fixed block to realize the compression and release of the first spring, so as to adapt to the requirements of marine drilling conditions, to increase the pressure and replenish the drilling fluid in the riser body, to speed up the reflux speed of the broken rock saltpeter in the riser body, and the drilling fluid has a unidirectional conduction effect, thereby improving the drilling efficiency.

[0016] 3. The deepwater crush resistant marine drilling riser and its manufacturing process suppress the reduction of compressive strength caused by the Bauschinger effect by optimizing the composition and structure of the pipe, and improve the compressive strength by controlling welding parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor: Figure 1 It is a schematic diagram of the front structure of the present invention; Figure 2 It is a structural schematic diagram of the auxiliary grouting mechanism of the present invention; Figure 3 This is a schematic diagram of the internal structure of the auxiliary grouting mechanism of the present invention; Figure 4 It is a structural schematic diagram of the movable installation mechanism of the present invention; Figure 5 It is a schematic diagram of the internal structure of the movable installation mechanism of the present invention.

[0018] In the figure: 1. water-blocking pipe body; 2. first flange; 3. second flange; 4. grouting pipe; 5. auxiliary grouting mechanism; 51. connecting pipe; 52. third flange; 53. fixed block; 54. first spring; 55. movable block; 56. limiting ring; 6. movable mounting mechanism; 61. screw; 62. connecting block; 63. limiting sleeve; 64. sliding rod; 65. rotating block; 66. second spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0021] See also Figure 1-3The present invention provides a technical solution: a deepwater crush resistant marine drilling riser, comprising a riser body 1, a first flange 2 is fixedly connected to the top of the riser body 1, a second flange 3 is fixedly connected to the bottom of the riser body 1, a grouting pipe 4 is fixedly connected to the right side of the riser body 1, an auxiliary grouting mechanism 5 is arranged on the top of the grouting pipe 4, and a movable mounting mechanism 6 is arranged inside the second flange 3.

[0022] Furthermore, the auxiliary grouting mechanism 5 includes a connecting pipe 51, which is fixedly connected to the top of the grouting pipe 4, a third flange 52 is fixedly connected to the top of the connecting pipe 51, a fixed block 53 is fixedly connected inside the connecting pipe 51, a first spring 54 is fixedly connected to the top of the fixed block 53, a movable block 55 is fixedly connected to the top of the first spring 54, and a limiting ring 56 is fixedly connected inside the connecting pipe 51, which facilitates locking and limiting between the second flange 3 and other equipment, reduces the workload of staff on the seabed, and increases work efficiency.

[0023] Furthermore, the movable block 55 is in contact with the limiting ring 56 , grooves are provided at corresponding positions of the connecting tube 51 and the movable block 55 , and the movable block 55 is slidably connected inside the groove, so that the connection process is more stable. Example

[0024] See also Figure 4-5 In combination with Example 1, it is further obtained that the movable mounting mechanism 6 includes a screw 61, the screw 61 is arranged inside the second flange 3, the top of the screw 61 is fixedly connected with a connecting block 62, the external thread of the screw 61 is connected to a limiting sleeve 63, the inside of the screw 61 is fixedly connected with a second spring 66, the top of the second spring 66 is fixedly connected with a sliding rod 64, and the inside of the screw 61 is rotatably connected with a rotating block 65, which is convenient for adapting to the requirements of marine drilling conditions, pressurizing and replenishing the drilling fluid in the watertight pipe body 1, so as to speed up the reflux speed of the broken rock saltpeter in the watertight pipe body 1, and the drilling fluid has a unidirectional conduction effect, thereby improving the drilling efficiency.

[0025] Furthermore, the slide bar 64 is in contact with the rotating block 65, grooves are provided at corresponding positions of the screw rod 61 and the slide bar 64, and the slide bar 64 is slidably connected inside the groove, so that the grouting process is more stable. Example

[0026] See also Figure 1-5 , and combined with Example 1 to Example 2, a manufacturing process of a deepwater crush resistant marine drilling riser is further obtained, comprising the following steps: S1. Material preparation First, the deepwater pressure-resistant marine drilling riser needs to determine the appropriate raw material ratio. During processing, the appropriate element ratio is determined according to the required magnetic properties and process requirements, and fine measurement is performed. The deepwater pressure-resistant marine drilling riser includes the following raw materials in weight percentage ratio: C: 0.055-0.065%, Si: 0.18-0.21%, Mn: 1.65-1.78%, P≤0.01%, S≤0.002%, Alt: 0.02-0.04%, Nb: 0.050-0.066%, Ti: 0.01-0.018%, Ni: 0.09-0.15%, Cr: 0.18-0.22%, Cu: 0.09-0.15%, Mo: 0.09-0.14%, and the balance is Fe and unavoidable impurity elements; S2. Molten Steel Refining The raw materials to be processed are introduced into an electric arc furnace for smelting to obtain molten steel, and then the obtained molten steel is degassed by electric arc heating and argon blowing under vacuum. The raw material heating temperature is controlled at 1160-1180°C, the total time of the raw materials in the furnace is controlled at 150-250min, and the holding time of the soaking section is ≥30min to ensure the temperature uniformity of the raw material thickness direction. The technical requirements for controlling the gas content of the steel grade are: H≤2ppm, O≤20ppm, N ≤100ppm, S ≤0.010%; S3, Ingot Casting When pouring molten steel, an inert gas is blown into the sliding nozzle to even out the composition and temperature and purify the molten steel. The poured ingot is slowly cooled in the pit for no less than 48 hours. S4, Processing and Forming When forging steel ingots, allowances for cutting heads and tails should be left, and the forging ratio should be no less than 3.5. After forging, annealing should be performed. After rolling, the steel pipe shape is obtained, and then the pipe blank is pre-welded and welded. The welding adopts the internal and external multi-wire submerged arc welding process. In the rolling process, two-stage controlled rolling is adopted. The rough rolling stage is rolled in the austenite recrystallization zone, and the finishing stage is rolled in the austenite non-recrystallization zone; the temperature in the rough rolling stage is controlled at 1060-1030°C, the single-pass reduction rate of the rough rolling longitudinal rolling is controlled at 12-35%, the starting rolling temperature in the finishing stage is 860-890°C, the final rolling temperature is 800-830°C, and the total reduction rate in the finishing stage is 66-75%. Then, the surface of the obtained steel pipe-shaped steel material is machined and polished. In the process of welding and connecting the steel pipe with other related structures, a groove design is adopted, and the quick connector and the steel pipe to be welded are aligned through an external joint device, and a 45° V-shaped groove is formed between the quick connector and the steel pipe.

[0027] In actual operation, when this device is used, the watertight pipe body 1 is first connected to other equipment through the first flange 2 and the second flange 3. After the staff holds the connecting block 62 and passes the screw 61 through the second flange 3, they press the slide bar 64, and the sliding bar 64 moves, and cooperates with the second spring 66 to rotate the rotating block 65. After the connection is completed, the staff rotates the limit sleeve 63 to achieve locking and limiting between the second flange 3 and other equipment. The grouting pipe 4 is connected to the external grouting equipment through the third flange 52. When the grouting inside the watertight pipe body 1 needs to be supplemented, the external grouting equipment works to introduce the grouting into the grouting pipe 4 through the connecting pipe 51. The grouting work starts, and the movable block 55 moves. The movable block 55 moves, and cooperates with the fixed block 53 to achieve compression and release of the first spring 54.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A deepwater crush resistant marine drilling riser, comprising a riser body (1), characterized in that: The top of the water-proof pipe body (1) is fixedly connected to a first flange (2), the bottom of the water-proof pipe body (1) is fixedly connected to a second flange (3), the right side of the water-proof pipe body (1) is fixedly connected to a grouting pipe (4), the top of the grouting pipe (4) is provided with an auxiliary grouting mechanism (5), and the inside of the second flange (3) is provided with a movable mounting mechanism (6).

2. The deepwater crush resistant marine drilling riser according to claim 1, characterized in that: The auxiliary grouting mechanism (5) comprises a connecting pipe (51), the connecting pipe (51) being fixedly connected to the top of the grouting pipe (4), the top of the connecting pipe (51) being fixedly connected to a third flange (52), the interior of the connecting pipe (51) being fixedly connected to a fixing block (53), the top of the fixing block (53) being fixedly connected to a first spring (54), the top of the first spring (54) being fixedly connected to a movable block (55), and the interior of the connecting pipe (51) being fixedly connected to a limiting ring (56).

3. The deepwater crush resistant marine drilling riser according to claim 2, characterized in that: The movable block (55) is in contact with a limiting ring (56); grooves are provided at positions corresponding to the connecting tube (51) and the movable block (55); and the movable block (55) is slidably connected inside the groove.

4. The deepwater crush resistant marine drilling riser according to claim 1, characterized in that: The movable mounting mechanism (6) comprises a screw rod (61), the screw rod (61) being arranged inside the second flange (3), the top of the screw rod (61) being fixedly connected to a connecting block (62), the outside of the screw rod (61) being threadedly connected to a limiting sleeve (63), the inside of the screw rod (61) being fixedly connected to a second spring (66), the top of the second spring (66) being fixedly connected to a sliding rod (64), and the inside of the screw rod (61) being rotatably connected to a rotating block (65).

5. The deepwater crush resistant marine drilling riser according to claim 4, characterized in that: The sliding rod (64) is in contact with the rotating block (65), grooves are provided at corresponding positions of the screw rod (61) and the sliding rod (64), and the sliding rod (64) is slidably connected inside the groove.

6. A manufacturing process for deepwater crush resistant marine drilling riser, according to any of claims 1-5, characterized in that: The following steps are involved: S1. Material preparation Firstly, the deepwater crush resistant marine drilling riser needs to determine the appropriate raw material ratio. During processing, the appropriate element ratio is determined according to the required magnetic properties and process requirements, and fine measurement is performed. S2. Molten Steel Refining The raw materials to be processed are introduced into an electric arc furnace for smelting to obtain molten steel, and then the obtained molten steel is heated by electric arc and stirred by argon gas under vacuum for degassing; S3, Ingot Casting When pouring molten steel, an inert gas is blown into the sliding nozzle to even out the composition and temperature and purify the molten steel. The poured ingot is slowly cooled in the pit for no less than 48 hours. S4, Processing and Forming When forging steel ingots, allowances for cutting heads and tails must be left, and the forging ratio must be no less than 3.

5. After forging, it must be annealed and rolled to obtain the shape of a steel pipe. The pipe blank is then pre-welded and welded using an internal and external multi-wire submerged arc welding process.

7. The manufacturing process of the deepwater crush resistant marine drilling riser according to claim 6, characterized in that: In the step S1, the deepwater crush resistant marine drilling riser comprises the following raw materials in weight percentage: C: 0.055-0.065%, Si: 0.18-0.21%, Mn: 1.65-1.78%, P≤0.01%, S≤0.002%, Alt: 0.02-0.04%, Nb: 0.050-0.066%, Ti: 0.01-0.018%, Ni: 0.09-0.15%, Cr: 0.18-0.22%, Cu: 0.09-0.15%, Mo: 0.09-0.14%, and the remainder is Fe and unavoidable impurity elements.

8. The manufacturing process of the deepwater crush resistant marine drilling riser according to claim 6, characterized in that: In the step S2, the raw material heating temperature is controlled at 1160-1180°C, the total raw material in-furnace time is controlled at 150-250min, the soaking section insulation time is ≥30min, the temperature uniformity of the raw material thickness direction is ensured, and the technical requirements for controlling the gas content of the steel grade are: H≤2ppm, O≤20ppm, N≤100ppm, S≤0.010%.

9. The manufacturing process of a deepwater crush resistant marine drilling riser according to claim 6, characterized in that: In the step S4, during the rolling process, two-stage controlled rolling is adopted, the rough rolling stage is rolled in the austenite recrystallization zone, and the finishing rolling stage is rolled in the austenite non-recrystallization zone; the temperature in the rough rolling stage is controlled at 1060-1030°C, the single-pass reduction rate of the rough rolling longitudinal rolling is controlled at 12-35%, the starting rolling temperature in the finishing rolling stage is 860-890°C, the final rolling temperature is 800-830°C, and the total reduction rate in the finishing rolling stage is 66-75%, and then the surface of the obtained steel tube-shaped steel material is machined and polished. In the process of welding and connecting the steel pipe with other related structures, a groove design is adopted, and the quick connector and the steel pipe to be welded are aligned through an external alignment device, and a 45° V-shaped groove is formed between the quick connector and the steel pipe.

Images