CN110608322B - Four-wire marine riser joint - Google Patents
Four-wire marine riser joint Download PDFInfo
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- CN110608322B CN110608322B CN201910856655.1A CN201910856655A CN110608322B CN 110608322 B CN110608322 B CN 110608322B CN 201910856655 A CN201910856655 A CN 201910856655A CN 110608322 B CN110608322 B CN 110608322B
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- male connector
- joint
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- 230000007704 transition Effects 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 239000004519 grease Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000010485 coping Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a four-wire marine riser joint which consists of a male joint and a female joint, wherein the male joint comprises an external cone thread, a small end face, a main shoulder and four uniformly distributed grooves adjacent to the main shoulder for placing locking blocks, and the female joint comprises an internal cone thread, a large end face, an auxiliary shoulder, a sealing groove and a stress relieving groove. The screw thread bearing surface adopts the negative bearing angle, and the screw thread guide surface is formed by two line segments transition, and external cone screw thread and interior cone screw thread cooperation are used, are the tapering and are 1:3, large taper threads; the tooth heights of the internal cone threads are equal, the tooth heights of the external cone threads are equal in the middle, and the two side threads are variable tooth height threads. The four-wire marine riser joint has the advantages of high buckling speed, easiness in storing thread grease among threads of the joint, uniform thread tooth stress and high bearing capacity.
Description
Technical Field
The invention relates to a four-wire marine riser joint.
Background
The marine riser used in offshore oil development is mostly a sectional type marine riser, the marine riser is connected through a joint, and the existing marine riser connecting joint mainly comprises a torque shoulder, a sealing part and connecting threads. In the function of the make-up process of the riser joint, larger torque is needed to overcome the friction force, and in order to facilitate the make-up, the thread grease needs to be stored between threads to reduce the friction force. The marine riser joint is connected through threads, whether the marine riser joint is connected through a single shoulder or a double shoulder, the threads are unevenly stressed, the deep sea condition is complex, and the marine riser is easily influenced by alternating load, so that the marine riser joint has higher requirements on the bearing capacity of the threads. The marine riser receives the influence of stormy waves, and the screw thread takes place not hard up easily and the screw thread is difficult for going into to detain to cause the screw thread damage that the screw thread is difficult for the butt joint to lead to of the not enough of leakproofness and joint strength. The traditional marine riser has the problems of low make-up speed, difficult storage of thread grease among the threads of the joint, uneven thread tooth stress, weak bearing capacity and the like.
Disclosure of Invention
The invention aims to overcome the defects and provide the four-wire marine riser joint which is high in fastening speed, easy to store thread grease among joint threads, uniform in thread tooth stress and high in bearing capacity.
The purpose of the invention is realized in the following way:
a four-wire marine riser joint consists of a male joint with external cone threads and a female joint with internal cone threads, wherein the male joint and the female joint are in butt joint left and right for use;
the heights of the teeth of the internal taper thread are equal,
the external cone thread is a tooth height-variable thread with the middle thread being equal in tooth height, the threads on two sides take a section of circular arc as a boundary, the height between the middle thread and the threads on two sides is in nonlinear change, the tooth height-variable thread is formed by intercepting a intercepting curve, the intercepting curve is a circular arc with the radius of r, r=500-600 mm, and the convex surface of the intercepting curve is outwards; through the arc cutting, the external cone thread is cut into an external thread with an arc surface from the thread with the same tooth height of the initial thread tooth, and the first thread tooth of the external thread is cut by 1/3-1/2 in the height direction; the last thread of the external thread is cut by 1/3-1/2 in the height direction, and one or more threads in the middle of the external thread are not cut.
Preferably, the thread teeth of the middle part of the outer cone thread are not intercepted and fully contact with the inner cone thread, the thread teeth of the two sides of the outer cone thread are intercepted by the intercepting curve part, the bearing surface of the outer cone thread at the intercepting part is reduced, and the contact area with the inner cone thread is reduced.
As a preferable mode, the external cone thread and the internal cone thread are matched, and the external cone thread and the internal cone thread are large-cone threads with the conicity of 1:3.
As one preferable mode, the thread line of the male connector thread comprises a male connector bearing surface and a male connector guide surface, wherein the male connector guide surface is formed by the transition of a male connector first line segment and a male connector second line segment, the included angle between the first line segment and a vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the male connector second line segment and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface and a male connector guide surface are connected through a male connector crest, a male connector second line segment is connected with the male connector crest, a bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a male connector first line segment is connected with the male connector root, the male connector root is a flat bottom, the taper direction of the male connector crest is opposite to that of the male connector external taper, the included angle between the male connector crest and the axis is 5-15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by transition of a female joint first line segment and a female joint second line segment, the female joint first line segment is parallel to a male joint first line segment, the female joint second line segment is parallel to a male joint second line segment, the included angle between the female joint first line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the female joint second line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface and a female joint guide surface are connected through a female joint crest, a female joint second line segment is connected with the female joint crest, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, a female joint first line segment is connected with the female joint root, the female joint root is flat bottom, the taper direction of the female joint root is opposite to the taper direction of the female joint internal taper thread, the included angle between the female joint root and the axis is gamma, and the gamma is 5-15 degrees.
As one preferable mode, the thread line of the male connector thread comprises a male connector bearing surface and a male connector guide surface, wherein the male connector guide surface is formed by the transition of a male connector first line segment and a male connector second line segment, the included angle between the first line segment and a vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the male connector second line segment and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface and a male connector guide surface are connected through a male connector crest, a male connector second line segment is connected with the male connector crest, the male connector crest is a flat top, the bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a male connector first line segment is connected with the male connector root, the male connector root is an arc root, the taper direction of the male connector crest is opposite to the taper direction of the male connector external taper thread, the included angle between the male connector crest and the axis is 5-15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by transition of a female joint first line segment and a female joint second line segment, the female joint first line segment is parallel to a male joint first line segment, the female joint second line segment is parallel to a male joint second line segment, the included angle between the female joint first line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the female joint second line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface and a female joint guide surface are connected through a female joint crest, a female joint second line segment is connected with the female joint crest, the female joint crest is a flat top, the bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, the female joint first line segment is connected with the female joint root, the female joint root is an arc, the taper direction of the female joint root is opposite to the taper direction of the female joint internal taper, the included angle between the female joint root and the axis is gamma, and gamma is 5-15 degrees.
Preferably, the pin thread top, the pin guide surface, the pin thread bottom and the box thread bottom, the box guide surface and the box coping of the external cone thread form a closed space in the make-up process.
Preferably, the pin further comprises a small end face and a major shoulder, and the box further comprises a large end face and a minor shoulder.
Preferably, a stress relief groove is arranged along the circumference of the auxiliary shoulder at the tangent position of the auxiliary shoulder of the female joint, the included angle phi between the oblique line of the stress relief groove and the vertical direction is 45-65 degrees, meanwhile, the stress relief groove and the auxiliary shoulder are in arc transition, and the arc radius of the arc transition is 1.3-2 mm.
Preferably, a sealing groove for placing a sealing ring is arranged along the circumference of the female joint at a distance of 10-15 mm from the female joint auxiliary shoulder, the depth of the sealing groove is 4-6 mm, the width of the sealing groove is 5-7 mm, the sealing groove consists of a groove bottom, a first side surface and a second side surface, the first side surface is far away from the female joint auxiliary shoulder relative to the second side surface, the groove bottom is a horizontal line segment, the first side surface is a vertical line segment, and the inclination angle eta of the second side surface and the horizontal line is 50-70 degrees.
Preferably, four evenly distributed grooves are formed in the tangent position of the main shoulder of the male connector, locking blocks are arranged in the grooves, a saw-tooth belt is arranged on one side, in contact with the female connector, of each locking block, the locking blocks are connected with the male connector through screws, and the male connector and the female connector are fixed through the locking blocks.
Compared with the prior art, the invention has the beneficial effects that:
the four-wire marine riser joint has the advantages of high buckling speed, easiness in storing thread grease among threads of the joint, uniform thread tooth stress and high bearing capacity.
Drawings
FIG. 1 is an axial cross-sectional view of a joint after make-up
FIG. 2 shows the connection state of the thread teeth after the completion of the make-up of the joint
FIG. 3 shows an unconnected male and female connector
FIG. 4 is an enlarged partial view of PT-4CQ thread teeth
FIG. 5 is an enlarged partial view of PT-4C thread ridge
FIG. 6 shows the male connector before it is cut
FIG. 7 is a cloud chart of the stress distribution of a pin with the thread intact
FIG. 8 is a cloud view of the stress distribution of a joint after the external taper thread is cut
Fig. 9 is a top view of the lock block.
Wherein:
pin 1, box 2, stress relief groove 3, seal ring 4, seal groove 5, lock piece 6, screw 7, groove 8, internal thread ridge 9, internal thread ridge 10, external thread ridge 11, external thread ridge 12, line segment a13, line segment b14, line segment a '15, line segment b'16, small end face 17, minor shoulder 18, major end face 19, major shoulder 20, pin load-bearing face 21, box load-bearing face 22, external taper thread 23, internal taper thread 24, third intermediate thread ridge 26, right-hand second thread ridge 27, right-hand first thread ridge 28, left-hand second thread ridge 29, left-hand first thread ridge 30, first intermediate thread ridge 32, second intermediate thread ridge 32, groove bottom 33, first side 34, second side 35.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-9, the invention discloses a four-wire marine riser joint. In my department, the model is divided into the following two types: PT-4CQ and PT-4C. As shown in the figure: a four-wire marine riser joint consists of a male joint 1 with external conical threads and a female joint 2 with internal conical threads, wherein the male joint 1 and the female joint 2 are in butt joint and matched left and right.
In the invention, the internal taper thread and the external taper thread are both four-head threads, which are conducive to rapid screwing, fig. 2 shows a connection state of thread teeth after screwing is finished, a male connector first thread, a male connector second thread, a male connector third thread and a male connector fourth thread are arranged on a male connector corresponding to the four-head threads, a female connector first thread, a female connector second thread, a female connector third thread and a female connector fourth thread are arranged on a female connector corresponding to the four-head threads, and the male connector 1 and the female connector 2 are uniformly arranged by 4×90 ° through the male connector first thread, the male connector second thread, the male connector third thread, the male connector fourth thread, the female connector first thread, the female connector second thread, the female connector third thread and the female connector fourth thread. The connection of the threads of the male and female connectors corresponds to fig. 2, with the mating of the respective threads being 1'1, 2'2, 3'3 and 4'4, respectively.
Fig. 3 shows the male connector 1 and the female connector 2 when not connected.
FIG. 4 is an enlarged view of a thread profile of a model PT-4CQ of a four-wire marine riser joint, the thread being adapted for use in a riser of 406.4mm to 660.4mm gauge, the joint pitch F being 6.43mm in the direction of taper and the thread profile height H being 1.85 to 2.3mm in the direction perpendicular to the taper.
Example 1 (PT-4 CQ)
Taking a male connector as an example for further explanation, a thread line of the male connector thread comprises a male connector bearing surface 21 and a male connector guide surface, wherein the male connector guide surface is formed by transition of a male connector first line segment 15 and a male connector second line segment 16, the included angle between the first line segment 15 and a vertical line is alpha 1, the included angle between the first line segment 15 and the vertical line is 45-65 degrees, the included angle between the male connector second line segment 16 and the vertical line is beta 1, the included angle between the beta 1 and the vertical line is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface 21 and a male connector guide surface are connected through a male connector crest 11, the bearing angle theta 1 of the male connector bearing surface 21 is-3 to-7 degrees, a male connector groove is formed between the male connector guide surface and the male connector bearing surface 21, the bottom of the male connector groove is a male connector root 12, the male connector root 12 is flat bottom, the taper direction of the male connector crest 11 is opposite to the taper direction of the male connector external taper thread, the included angle between the male connector crest 11 and the axis is gamma 1, and the included angle gamma 1 is 5-15 degrees.
As with the pin, the thread of the box thread includes a box bearing surface 22 and a box guide surface, the box guide surface being formed by the transition of a box first line segment 13 and a box second line segment 14, the box first line segment 13 being parallel to the pin first line segment 15, the box second line segment 14 being parallel to the pin second line segment 16. The included angle between the first line segment 13 of the female joint and the vertical line is alpha, alpha is 45-65 degrees, the included angle between the second line segment 14 of the female joint and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface 22 and a female joint guide surface are connected through a female joint crest 9, the bearing angle theta of the female joint bearing surface 22 is-3 to-7 degrees, a female joint groove is formed between the female joint guide surface and the female joint bearing surface 22, the bottom of the female joint groove is a female joint root 10, the female joint root 10 is flat bottom, the taper direction of the female joint root 10 is opposite to the taper direction of female joint internal taper thread, the included angle between the female joint root 10 and the axis is gamma, and gamma is 5-15 degrees.
Example 2 (PT-4C)
FIG. 5 is an enlarged view of a portion of a PT-4C thread which is suitable for use in a riser having a gauge of 711.2mm to 914.4mm, unlike example 1 where the box thread root 10 and the pin thread root 12 are arcuate roots, the radius R is 1.5 to 2mm, and the box thread crest 9 and the pin thread crest 11 are flat-topped. The pitch F of the joint in the taper direction is 10mm, and the tooth height H of the thread tooth in the direction perpendicular to the taper is 3-5 mm. Taking a male connector as an example for further explanation, the male connector guide surface is formed by transition of a male connector first line segment 15 and a male connector second line segment 16, the included angle between the male connector first line segment 15 and a vertical line is alpha 1, alpha 1 is 45-65 degrees, and the male connector second line segment 16 and the thread taper direction are the same; on the same thread line, the pin bearing surface 21 and the pin guide surface are connected through the pin crest 11, and the bearing angle theta 1 of the pin bearing surface 21 is-3 to-7 degrees.
Like the male connector, the PT-4C female connector thread guiding surface is formed by transition of a female connector first line segment 13 and a female connector second line segment 14, the female connector first line segment 13 is parallel to the male connector first line segment 15, and the female connector second line segment 14 is parallel to the male connector second line segment 16. The included angle between the first line segment 13 of the female joint and the vertical line is alpha, the alpha is 45-65 degrees, the second line segment 14 of the female joint and the taper direction of the screw thread are the same, and on the same screw thread, the bearing surface 22 of the female joint is connected with the guide surface through the crest 9, and the bearing angle theta of the bearing surface 22 of the female joint is-3 to-7 degrees.
In the invention, a closed space is formed by the male joint crest 11, the male joint guide surface, the male joint root 12 of the external cone thread and the female joint root 10, the female joint guide surface and the female joint coping 9 of the internal cone thread in the make-up process, so that the thread grease is stored, and the friction force in the make-up process is reduced.
In the invention, the external taper thread and the internal taper thread are matched for use and are large taper threads with the taper of 1:3; the tooth heights of the inner cone threads 24 are equal, the tooth heights of the outer cone threads 23 are equal, and the tooth heights of the two side threads are variable tooth height threads with a section of circular arc as a boundary. The tooth height-variable thread is formed by cutting a cutting curve, the cutting curve is an arc with the radius r, r=500-600 mm, and the convex surface of the cutting curve is outwards; through the arc, the external cone thread 23 is cut into an external thread with an arc surface from the thread with the same height as the initial thread tooth, and the first thread tooth of the external thread is cut into 1/3-1/2 in the height direction; the last thread of the external thread is cut by 1/3-1/2 in the height direction, and 1-3 threads in the middle of the external thread are not cut. Fig. 6 a shows the pin 1 before the pin is not cut, and the curve 31 shows the cut curve, through which the pin external taper thread 23 becomes the constant pitch of the intermediate thread, and the pitch of the two-sided thread varies nonlinearly, see fig. 6 b.
In the invention, the inner cone thread and the outer cone thread are matched for use, the bearing surfaces of the thread teeth are tightly contacted under the action of tension force after the screwing is completed, the thread teeth of the middle part of the outer cone thread are not intercepted and fully contacted with the inner cone thread, the first middle thread teeth 31, the second middle thread teeth 32 and the third middle thread teeth 26 are seen in the figure 2, the thread teeth on two sides of the outer cone thread are intercepted by the intercepting curve parts, the bearing surfaces are correspondingly reduced, the contact area with the inner cone thread is reduced, and the contact area with the inner cone thread is reduced, namely the right end second thread teeth 27, the right end first thread teeth 28, the left end second thread teeth 29 and the left end first thread teeth 30. By the method, the thread teeth are uniformly stressed under the action of the tensioning force, so that the bearing capacity of the threads is improved. FIG. 7 is a cloud chart of joint stress distribution of a male external cone thread being a complete thread when the interference of a main shoulder is 0.2mm and the interference of a sub shoulder is 0.1mm, wherein the maximum equivalent Cauchy stress of the thread is 589Mpa, the minimum Cauchy stress is 195Mpa, and the ratio of the maximum stress to the minimum stress is 3.02:1; FIG. 8 is a cloud chart of joint stress distribution after cutting the male external cone thread when the interference of the main shoulder is 0.2mm and the interference of the auxiliary shoulder is 0.1mm, wherein the maximum equivalent Cauchy stress of the thread is 511Mpa, the minimum Cauchy stress is 230Mpa, and the ratio of the maximum stress to the minimum stress is 2.22:1, it can be seen that the thread teeth after interception are relatively more uniform in stress and higher in bearing capacity.
In the invention, a stress relieving groove 3 is arranged along the circumference of the auxiliary shoulder 18 at the tangent position of the auxiliary shoulder of the female joint, as shown in figure 3, the inclined line of the relieving groove forms an included angle phi of 45-65 degrees with the vertical direction, and meanwhile, the inclined line is in arc transition with the auxiliary shoulder, and the arc radius R of the transition arc is 1.3-2 mm.
In the invention, a sealing groove for placing a sealing ring is arranged along the periphery of a female joint at a distance of 10-15 mm from the auxiliary shoulder of the female joint, and has a depth L1 of 4-6 mm and a width L2 of 5-7 mm, the sealing groove consists of a groove bottom 33, a first side surface 34 and a second side surface 35, the first side surface 34 is far away from the auxiliary shoulder of the female joint relative to the second side surface 35, the groove bottom 33 is a horizontal line segment, the first side surface 34 is a vertical line segment, the inclination angle eta of the second side surface 35 and the horizontal line is 50-70 degrees, and the sealing ring 4 in the sealing groove is in interference fit with the male joint 1 and the female joint 2 after the screwing is completed, so that the sealing is realized.
In the present invention, four evenly distributed grooves 8 are provided tangentially to the main shoulder 20 of the male connector, which grooves 8 are used for receiving the locking pieces 6.
In the invention, a saw-tooth belt is arranged on the contact side of the locking piece 6 and the female connector 2, as shown in fig. 9, the locking piece 6 is connected with the male connector 1 through the screw 7, and the male connector 1 and the female connector 2 are fixed through the locking piece, so that the male connector and the female connector are prevented from loosening under the action of impact load.
The foregoing is merely a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the invention.
Claims (6)
1. A four-wire marine riser joint consists of a male joint with external cone threads and a female joint with internal cone threads, wherein the male joint and the female joint are in butt joint left and right for use;
the method is characterized in that:
the heights of the teeth of the internal taper thread are equal,
the external cone thread is a tooth height-variable thread with the middle thread being equal in tooth height, the threads on two sides take a section of circular arc as a boundary, the height between the middle thread and the threads on two sides is in nonlinear change, the tooth height-variable thread is formed by intercepting a intercepting curve, the intercepting curve is a circular arc with the radius of r, r=500-600 mm, and the convex surface of the intercepting curve is outwards; through the arc cutting, the external cone thread is cut into an external thread with an arc surface from the thread with the same tooth height of the initial thread tooth, and the first thread tooth of the external thread is cut by 1/3-1/2 in the height direction; the last thread of the external thread is cut by 1/3-1/2 in the height direction, and one or more thread in the middle of the external thread is not cut;
the male joint also comprises a small end face and a main shoulder, and the female joint also comprises a large end face and a sub shoulder;
the thread line of the pin thread and the thread line of the box thread include the following two cases:
in the first case, the thread line of the male connector thread comprises a male connector bearing surface and a male connector guide surface, wherein the male connector guide surface is formed by the transition of a male connector first line segment and a male connector second line segment, the included angle between the first line segment and a vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the male connector second line segment and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface and a male connector guide surface are connected through a male connector crest, a male connector second line segment is connected with the male connector crest, a bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a male connector first line segment is connected with the male connector root, the male connector root is a flat bottom, the taper direction of the male connector crest is opposite to that of the male connector external taper, the included angle between the male connector crest and the axis is 5-15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by transition of a female joint first line segment and a female joint second line segment, the female joint first line segment is parallel to a male joint first line segment, the female joint second line segment is parallel to a male joint second line segment, the included angle between the female joint first line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the female joint second line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface and a female joint guide surface are connected through a female joint crest, a female joint second line segment is connected with the female joint crest, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is formed between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, a female joint first line segment is connected with the female joint root, the female joint root is a flat bottom, the taper direction of the female joint root is opposite to the taper direction of female joint internal taper thread, the included angle between the female joint root and an axis is gamma, and the gamma is 5-15 degrees;
in the second case, the thread line of the male joint thread comprises a male joint bearing surface and a male joint guiding surface, the male joint guiding surface is formed by the transition of a male joint first line segment and a male joint second line segment, the included angle between the first line segment and a vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the male joint second line segment and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface and a male connector guide surface are connected through a male connector crest, a male connector second line segment is connected with the male connector crest, the male connector crest is a flat top, the bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a male connector first line segment is connected with the male connector root, the male connector root is an arc root, the taper direction of the male connector crest is opposite to the taper direction of the male connector external taper thread, the included angle between the male connector crest and the axis is 5-15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by transition of a female joint first line segment and a female joint second line segment, the female joint first line segment is parallel to a male joint first line segment, the female joint second line segment is parallel to a male joint second line segment, the included angle between the female joint first line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the female joint second line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface and a female joint guide surface are connected through a female joint crest, a female joint second line segment is connected with the female joint crest, the female joint crest is a flat top, the bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, the female joint first line segment is connected with the female joint root, the female joint root is an arc, the taper direction of the female joint root is opposite to the taper direction of the female joint internal taper, the included angle between the female joint root and the axis is gamma, and gamma is 5-15 degrees.
2. A four-wire marine riser joint according to claim 1, wherein: the thread teeth of the middle part of the external cone thread are not intercepted and fully contact with the internal cone thread, the thread teeth on two sides of the external cone thread are intercepted by the intercepting curve part, the bearing surface of the external cone thread at the intercepting part is reduced, and the contact area with the internal cone thread is reduced.
3. A four-wire marine riser joint according to claim 1, wherein: the external taper thread and the internal taper thread are matched for use and are large taper threads with the taper of 1:3.
4. A four-wire marine riser joint according to claim 1, wherein: the stress relieving groove is arranged at the tangent position of the auxiliary shoulder of the female joint along the circumference of the auxiliary shoulder, the included angle phi between the oblique line of the stress relieving groove and the vertical direction is 45-65 degrees, meanwhile, the stress relieving groove and the auxiliary shoulder are in arc transition, and the arc radius of the arc transition is 1.3-2 mm.
5. A four-wire marine riser joint according to claim 1, wherein: the sealing groove is arranged along the circumference of the female joint at a distance of 10-15 mm from the auxiliary shoulder of the female joint, the depth of the sealing groove is 4-6 mm, the width of the sealing groove is 5-7 mm, the sealing groove consists of a groove bottom, a first side surface and a second side surface, the first side surface is far away from the auxiliary shoulder of the female joint relative to the second side surface, the groove bottom is a horizontal line segment, the first side surface is a vertical line segment, and the inclination angle eta between the second side surface and the horizontal line is 50-70 degrees.
6. A four-wire marine riser joint according to claim 1, wherein: four evenly distributed grooves are formed in the tangent position of the main shoulder of the male connector, locking blocks are arranged in the grooves, a saw-tooth belt is arranged on one side, in contact with the female connector, of each locking block, the locking blocks are connected with the male connector through screws, and the male connector and the female connector are fixed through the locking blocks.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910856655.1A CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
| PCT/CN2019/110501 WO2021046955A1 (en) | 2019-09-11 | 2019-10-11 | Four-line marine riser coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910856655.1A CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
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| CN110608322A CN110608322A (en) | 2019-12-24 |
| CN110608322B true CN110608322B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910856655.1A Active CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
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| Country | Link |
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| CN (1) | CN110608322B (en) |
| WO (1) | WO2021046955A1 (en) |
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| CN113027352B (en) * | 2021-03-26 | 2022-07-01 | 上海亦又新能源科技有限公司 | Drill rod joint for coal mining |
| CN115949811A (en) * | 2022-12-07 | 2023-04-11 | 毫厘机电(苏州)有限公司 | Water joint structure capable of improving plasticizing strength of adhesive and process method thereof |
| CN119825258B (en) * | 2025-03-18 | 2025-06-17 | 上海海隆石油钻具有限公司 | A torsion-resistant drill pipe joint and a drill pipe joint design method |
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| Publication number | Publication date |
|---|---|
| WO2021046955A1 (en) | 2021-03-18 |
| CN110608322A (en) | 2019-12-24 |
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