CN113682426A

CN113682426A - Anchor chain connector of floating oil and gas production storage and unloading device

Info

Publication number: CN113682426A
Application number: CN202111010651.5A
Authority: CN
Inventors: 蔡荣; 张爱平; 彭伟存; 罗辉广; 王阳; 刘伯阳
Original assignee: CNOOC Safety and Technology Services Co Ltd Shenzhen Branch
Current assignee: CNOOC Safety and Technology Services Co Ltd Shenzhen Branch
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-23

Abstract

The invention discloses a floating oil and gas production storage and unloading device anchor chain connector, which comprises a stopper, wherein a female joint is connected below the stopper, and the stopper and the female joint can rotate relatively; the improved nut joint structure is characterized in that a mandrel is arranged below the nut joint, the upper end of the mandrel is inserted into the nut joint, a ball cage is sleeved on the outer surface of the mandrel, the ball cage is inserted into the nut joint along with the mandrel and is in contact with the inner wall of the nut joint, a plurality of balls are arranged on the ball cage, and the balls are partially embedded into the mandrel and partially embedded into the nut joint. According to the invention, the ball cage is arranged, so that a plurality of different balls form a whole, thereby strengthening the connection among all parts and avoiding the falling of the anchor chain.

Description

Anchor chain connector of floating oil and gas production storage and unloading device

Technical Field

The invention relates to the field of ocean engineering machinery, in particular to an anchor chain connector of a floating oil and gas production storage and unloading device.

Background

In the exploration and development of marine oil and gas resources, an offshore drilling and production platform is widely applied equipment. Due to the complex and variable static and dynamic characteristics of sea water, typhoon and the like in the sea, the operation environment of the sea drilling and production platform is severe, and the floating oil and gas production storage and unloading device is influenced by sea waves, undercurrents, typhoons and the like besides the action of huge dead weight, seawater corrosion and the like. The ocean equipment is generally high in manufacturing cost and long in production period, so that the ocean equipment is prevented from being invalid and has important significance.

The anchor chain system is an important mooring device of the floating oil and gas production storage and unloading device, and is important for the stability and the safety of the floating oil and gas production storage and unloading device under the action of ocean currents, typhoons and the like. The anchor chain system usually comprises a plurality of anchor chains, each anchor chain is tied on an anchor pile, a steel cable, a heavy chain, an adjusting chain, a buoy and the like are arranged between the anchor pile and the tug boat, the whole anchor chain can reach the length of thousands of meters, and the weight of the anchor chain is generally large. The enormous weight of the anchor chain makes it difficult to manually connect the anchor chain to the tug boat. Therefore, it is desirable to design a device for quick connection of anchor chains. In the floating oil and gas production storage and unloading device operation field, rigid connection is generally adopted in the prior art, a connecting device is flexibly connected by using a belt ball, but the ball is fixed on a mandrel, and when the diameter of the ball is reduced due to seawater corrosion or abrasion, key parts of a connector are easy to separate, so that an anchor chain falling accident is caused. Once the safety accidents such as the falling of the anchor chain occur, the detection and maintenance cost of tens of millions or hundreds of millions of RMB of oil companies is frequently spent.

Disclosure of Invention

The invention aims to overcome the defect that parts in a connector are easy to fall off and an anchor chain falls off in seawater corrosion due to the fact that balls are directly fixed on a mandrel in the prior art, and provides the anchor chain connector of the floating oil and gas production storage and unloading device.

The purpose of the invention is mainly realized by the following technical scheme:

a floating oil and gas production storage and unloading device anchor chain connector comprises a stopper, a female joint is connected below the stopper, and the stopper can rotate relative to the female joint; the improved nut joint structure is characterized in that a mandrel is arranged below the nut joint, the upper end of the mandrel is inserted into the nut joint, a ball cage is sleeved on the outer surface of the mandrel, the ball cage is inserted into the nut joint along with the mandrel and is in contact with the inner wall of the nut joint, a plurality of balls are arranged on the ball cage, and the balls are partially embedded into the mandrel and partially embedded into the nut joint.

At present, when the anchor chain connector is used, the long-time operation in a seawater environment is needed, so the corrosion problem of the connector is inevitable, generally, the retest problem of the connector is solved mainly by replacing parts at regular intervals, and in the using process of the anchor chain connector, the ball plays a very key connecting role, but the loss of the ball cannot be simply calculated through seawater corrosion, the loss is various and comprises various reasons such as mechanical abrasion, seawater corrosion and the like, so the prediction of a replacement period is difficult to carry out, and if the replacement is too frequent, the control of material cost and manpower cost is not facilitated, but as the ball is fixed on a mandrel, when the diameter of the ball is reduced, the key parts of the connector are easy to separate, so the anchor chain falling accident is caused, and the anchor chain falling belongs to a serious production accident, events that can produce the effects of chain reactions need to be avoided as much as possible; according to the invention, the balls are fixed in a mode of arranging the ball cage, all the balls form an integral effect through the ball cage, so that the phenomenon that the connection between a mandrel and the female joint is greatly influenced due to the fact that part of the balls are damaged is avoided, in the invention, the ball cage is inserted into the female joint along with the mandrel, the fixing and the connection are effectively strengthened, in addition, the mechanical damage and seawater corrosion of the balls can also be reduced to a certain extent through the protection of the ball cage, and therefore, the diameter of the balls can be prevented from being too quickly reduced.

Further, a rotating shaft is arranged on the female joint and penetrates through the female joint, and two ends of the rotating shaft are fixed with the retainer; the rotating shaft is positioned above the mandrel. Through the intermediate connection of the rotating shaft, the stopper can rotate relative to the female joint, so that the failure of the stopper is avoided.

Furthermore, the upper half part of the female joint is provided with a shaft hole, and the rotating shaft is positioned in the shaft hole; the lower end face of the female joint is internally provided with a joint blind hole, the joint blind hole is internally provided with a plurality of annular grooves, the mandrel is inserted into the joint blind hole, and the ball is embedded into the annular grooves. According to the invention, the position of the ball is limited by the annular groove in the blind hole of the joint, so that the ball can effectively play a role in connection.

Further, a ball groove is formed in the mandrel, and the positions and the number of the ball grooves correspond to those of the annular grooves: each annular groove corresponds to one ball groove; the annular groove and the ball groove are combined to be capable of accommodating a complete ball. The combination of the annular grooves and the ball grooves can contain complete balls, so that the mechanical damage of the balls can be reduced as much as possible, and the positions and the number of the ball grooves correspond to those of the annular grooves, so that the balls are arranged orderly.

Furthermore, the ball cage comprises a cage body, a plurality of layers of circumferentially distributed ball holes are formed in the cage body, a cage bottom circular bead is fixed on one side of the ball cage close to the bottom end of the female joint, and the cage bottom circular bead is fixed with the mandrel. The cage body is used for bearing balls, the ball holes are used for limiting the positions of the balls, and the shoulder at the bottom of the cage is extended to increase the contact surface, so that the fixation is more stable.

Further, a mandrel shoulder is fixed on the mandrel and located above the cage bottom shoulder, a spring is arranged between the mandrel shoulder and the cage bottom shoulder, the upper end of the spring is fixed with the mandrel shoulder, and the lower end of the spring is fixed with the cage bottom shoulder. According to the invention, the mandrel shoulder and the cage bottom shoulder are fixed through the springs, so that not only is the contact surface increased and the position between the mandrel shoulder and the cage bottom shoulder is more stable, but also the purpose of locking the mandrel is achieved through the springs, so that the mandrel is tightly propped by external force to strengthen connection.

Further, a Y-shaped connector is fixed below the mandrel, and is used for: and connecting the anchor chain with the mandrel. According to the invention, the Y-shaped connector is adopted to connect the cat face and the mandrel, so that the Y-shaped connector can enable the connection position to be more stable and has stronger external force resistance.

Furthermore, a connecting hole is formed in the core shaft, a connecting pin is inserted into the connecting hole, and the Y-shaped connector is connected with the core shaft through the connecting pin. The connecting pins are used for connection, so that the purpose of stable connection can be achieved, and the maintenance and the disassembly are convenient.

Furthermore, the end of one end of the connecting pin is larger than the aperture of the connecting hole, the other end of the connecting pin is provided with an external thread, one end of the connecting pin, which is provided with the external thread, penetrates through the connecting hole and extends out of the Y-shaped connector, a locking nut is sleeved on the external thread, and the locking nut abuts against the Y-shaped connector. Through lock nut, strengthen the stability of connecting.

Furthermore, one side of the locking nut, which is far away from the Y-shaped connector, is provided with an anti-falling pin, and the anti-falling pin is inserted into the connecting pin. Through the anticreep round pin, avoid under the unexpected condition, breaking away from of connecting pin.

In conclusion, compared with the prior art, the invention has the following beneficial effects:

(1) in the invention, the ball cage is inserted into the female joint along with the mandrel, so that the fixing and connection are effectively enhanced, and the mechanical damage and seawater corrosion of the ball can be reduced to a certain extent by the protection of the ball cage, thereby avoiding the rapid reduction of the diameter of the ball.

(2) The invention realizes the limitation of the position of the ball through the annular groove in the blind hole of the joint, thereby effectively connecting the ball.

(3) The device has simple structure, convenient installation and quick connection; in the device, a plurality of balls are uniformly stressed together, so that the failure of the balls caused by uneven stress can be reduced; the ball groove of the device is in a strip shape with variable depth, and the ball is not easy to fall off under the action of the compression spring.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of a floating oil and gas production storage and offloading device anchor chain connector of the present invention;

FIG. 2 is a cross-sectional view of the construction of a floating oil and gas production storage and offloading anchor connector of the present invention;

FIG. 3 is a block diagram of the anchor chain connector of the floating oil and gas production storage and offloading device of the present invention, which is composed of a female joint, a ball cage, a mandrel and balls connected together;

FIG. 4 is a schematic structural view of a female connector of an anchor chain connector of a floating oil and gas production storage and offloading device of the present invention;

FIG. 5 is a cross-sectional view of the female connector of the anchor chain connector of a floating oil and gas production storage and offloading device of the present invention;

FIG. 6 is another schematic illustration of a female connector of an anchor connector of a floating hydrocarbon production storage and offloading device of the present invention;

FIG. 7 is a schematic illustration of the ball cage of the anchor chain connector of a floating oil and gas production storage and offloading device of the present invention;

FIG. 8 is a schematic structural view of a mandrel of an anchor chain connector of a floating oil and gas production storage and offloading device of the present invention;

FIG. 9 is another schematic illustration of the mandrel of the anchor chain connector of the floating hydrocarbon production storage and offloading device of the present invention;

FIG. 10 is another schematic illustration of the mandrel of the anchor chain connector of a floating oil and gas production storage and offloading device of the present invention;

the reference numerals indicate: 1. the anti-slip ball cage comprises a retainer, 2. a rotating shaft, 3. a female joint, 3a shaft hole, 3b joint blind holes, 3c annular grooves, 4. a ball cage, 4a cage body, 4b ball holes, 4c cage bottom shoulder, 5. a mandrel, 5a connecting hole, 5b ball grooves, 5c mandrel shoulder, 6. a ball, 7. a spring, 8. a Y-shaped connector, 9. a connecting pin, 10. a locking nut and 11. an anti-slip pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example (b):

as shown in fig. 1-10, the anchor chain connector of the floating oil and gas production storage and unloading device comprises a stopper 1, a female joint 3 is connected below the stopper 1, and the stopper 1 can rotate relative to the female joint 3; the lower of box 3 is equipped with dabber 5, the upper end of dabber 5 is inserted in box 3, the surface cover of dabber 5 is equipped with ball cage 4, ball cage 4 along with dabber 5 insert in box 3 and with the inner wall contact of box 3 be equipped with a plurality of balls 6 on the ball cage 4, ball part embedding dabber 5 and partial embedding box 3. A rotating shaft 2 is further arranged on the female joint 3, the rotating shaft 2 penetrates through the female joint 3, and two ends of the rotating shaft are fixed with the retainer 1; the rotating shaft 2 is positioned above the mandrel 5.

A shaft hole 3a is formed in the upper half part of the female joint 3, and the rotating shaft 2 is positioned in the shaft hole 3 a; a joint blind hole 3b is formed in the lower end surface of the female joint 3 in an inward opening mode, a plurality of annular grooves 3c are formed in the joint blind hole 3b, the mandrel 5 is inserted into the joint blind hole 3b, and the ball is embedded into the annular grooves 3c. The mandrel 5 is provided with ball grooves 5b, and the positions and the number of the ball grooves 5b correspond to those of the annular grooves 3 c: each annular groove 3c corresponds to one ball groove 5 b; the annular groove 3c and the ball groove 5b in combination are able to accommodate the complete ball 6. Ball cage 4 includes the cage body 4a, and it has a plurality of layers of circumference to open the ball hole 4b that distribute on the cage body 4a, ball cage 4 is fixed with shoulder 4c at the bottom of the cage in the one side that is close to 3 bottoms of female joint, shoulder 4c is fixed with dabber 5 at the bottom of the cage. A mandrel shoulder 5c is fixed on the mandrel 5, the mandrel shoulder 5c is positioned above the cage bottom shoulder 4c, a spring 7 is arranged between the mandrel shoulder 5c and the cage bottom shoulder 4c, the upper end of the spring 7 is fixed with the mandrel shoulder 5c, and the lower end of the spring is fixed with the cage bottom shoulder 4c.

A Y-shaped connector 8 is fixed below the mandrel 5, and the Y-shaped connector 8 is used for: connecting the anchor chain with the mandrel 5. The mandrel 5 is provided with a connecting hole 5a, a connecting pin 9 is inserted into the connecting hole 5a, and the Y-shaped connector 8 is connected with the mandrel 5 through the connecting pin 9. The end of one end of the connecting pin 9 is larger than the aperture of the connecting hole 5a, the other end of the connecting pin is provided with an external thread, one end of the connecting pin 9 provided with the external thread penetrates through the connecting hole 5a and extends out of the Y-shaped connector 8, a locking nut 10 is sleeved on the external thread, and the locking nut 10 abuts against the Y-shaped connector 8. And one side of the locking nut 10, which is far away from the Y-shaped connector 8, is provided with a separation-preventing pin 11, and the separation-preventing pin 11 is inserted into the connecting pin 9.

In the embodiment, the stopper 1 and the female joint 3 can rotate relatively because the stopper 1 and the female joint 3 are connected through the rotating shaft 2; the female joint 3 is provided with a shaft hole 3a, a joint blind hole 3b and annular grooves 3c, the annular grooves 3c are arranged on the inner wall of the joint blind hole 3b, the number of the annular grooves 3c can be multiple as required, and the rotating shaft 2 penetrates through the shaft hole 3 a; the ball cage 4 is inserted into a joint blind hole 3b of the female joint 3, the ball cage 4 comprises a cage body 4a, ball holes 4b and a cage bottom shoulder 4c, the ball cage 4 is provided with a plurality of circles of ball holes 4b, and the ball holes 4b on each circle are uniformly distributed along the circumferential direction; the mandrel 5 is provided with a connecting hole 5a, ball grooves 5b and a mandrel shoulder 5c, the number of the ball grooves 5b can be multiple circles according to requirements, and the ball grooves 5b on each circle are uniformly distributed along the circumferential direction; the ball groove 5b is in a strip shape, and the depth of the ball groove is gradually increased from top to bottom along the axial direction of the mandrel 5; when the ball cage 4 is completely inserted into the joint blind hole 3b, each ring of ball holes 4b and the annular groove 3c have the same axial position, and each ball hole 4b is matched with the ball groove 5b for mounting the ball 6; the ball 6 is arranged among the female joint 3, the ball cage 4 and the mandrel 5 and is positioned in the annular groove 3c, the ball hole 4b and the ball groove 5b, and the diameter of the ball 6 is larger than that of the ball hole 4 b; a spring 7 is arranged between the cage bottom shoulder 4c and the mandrel shoulder 5c, and the spring 7 is in a compressed state; the mandrel 5 is connected with the Y-shaped connector 8 through a connecting pin 9, the mandrel 5 and the Y-shaped connector 8 can rotate relatively, and the connecting pin 9 penetrates through the connecting hole 5 a; the end part of the connecting pin 9 is connected with a locking nut 10 through threads, and an anti-falling pin 11 penetrating through the connecting pin 9 is further arranged outside the locking nut 10.

The installation process of the anchor chain connector of the floating oil and gas production storage and unloading device in the embodiment comprises the following steps: firstly, a retainer 1, a rotating shaft 2 and a female joint 3 are connected into a whole and installed on a towing boat, then a mandrel 5 and a Y-shaped connector 8 are connected through a connecting pin 9 in sequence, a spring 7 is placed on a mandrel shoulder 5c, a ball 6 is placed in a ball groove 5b, the mandrel 5 filled with the ball 6 is inserted into a ball cage 4, the cage bottom shoulder 4c compresses the spring 7, the mandrel 5 moves downwards relative to the female joint 3 through the counter force of the spring 7, the ball 6 rolls to one end of the ball groove 5b, the parts consisting of the ball cage 4, the mandrel 5, the ball 6, the spring 7, the Y-shaped connector 8, the connecting pin 9, a locking nut 10 and an anti-falling pin 11 are positioned on an anchor chain, and the mandrel 5 filled with the ball cage 4, the ball 6 and the spring 7 is inserted into the female joint 3, so that the anchor chain connector can be installed quickly; in the anchor chain connector of the floating oil and gas production storage and unloading device, the spring 7 has the function of enabling the female joint 3 and the mandrel 5 to have a self-locking function under the action of the ball 6, in addition, the Y-shaped connector 8 is connected with an anchor chain with huge weight, so that the female joint 3 and the mandrel 5 are both pulled, and the change of the depth of the ball groove 5b enables the ball 6 to roll to the shallow side of the groove, namely the anchor chain connector is pulled more and more tightly; the ball cage 4 acts to constrain all of the balls 6 to move in synchronism, thereby forcing all of the balls 6 in synchronism.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A floating oil and gas production storage and unloading device anchor chain connector comprises a retainer (1), and is characterized in that a female joint (3) is connected below the retainer (1), and the retainer (1) can rotate relative to the female joint (3); the lower of female joint (3) is equipped with dabber (5), insert in female joint (3) the upper end of dabber (5), the surface cover of dabber (5) is equipped with ball cage (4), ball cage (4) insert female joint (3) along with dabber (5) in and with the inner wall contact of female joint (3) be equipped with a plurality of balls (6) on ball cage (4), ball part embedding dabber (5) and partial embedding female joint (3).

2. The floating oil and gas production storage and offloading device anchor chain connector of claim 1, characterized in that a rotating shaft (2) is further provided on the female joint (3), the rotating shaft (2) penetrates through the female joint (3) and both ends are fixed with the retainer (1); the rotating shaft (2) is positioned above the mandrel (5).

3. The floating oil and gas production storage and offloading device anchor chain connector of claim 2, characterized in that a shaft hole (3a) is opened at the upper half part of the female joint (3), and the rotating shaft (2) is positioned in the shaft hole (3 a); the lower end face of the female joint (3) is inwards provided with a joint blind hole (3b), the joint blind hole (3b) is internally provided with a plurality of annular grooves (3c), the mandrel (5) is inserted into the joint blind hole (3b), and the ball is embedded into the annular grooves (3 c).

4. A floating oil and gas production storage and offloading device anchor chain connector according to claim 3, characterized in that ball grooves (5b) are opened on the mandrel (5), the positions and number of the ball grooves (5b) and the annular grooves (3c) correspond: each annular groove (3c) corresponds to one ball groove (5 b); the annular groove (3c) and the ball groove (5b) are combined to be capable of accommodating a complete ball (6).

5. The floating oil and gas production storage and offloading device anchor chain connector as claimed in claim 1, characterized in that the ball cage (4) comprises a cage body (4a), a plurality of layers of circumferentially distributed ball holes (4b) are formed in the cage body (4a), a cage bottom shoulder (4c) is fixed on one side of the ball cage (4) close to the bottom end of the female joint (3), and the cage bottom shoulder (4c) is fixed with the mandrel (5).

6. The floating hydrocarbon production storage and offloading device anchor chain connector of claim 5, wherein the mandrel (5) is fixed with a mandrel shoulder (5c), the mandrel shoulder (5c) is located above the cage bottom shoulder (4c), a spring (7) is arranged between the mandrel shoulder (5c) and the cage bottom shoulder (4c), the upper end of the spring (7) is fixed with the mandrel shoulder (5c), and the lower end of the spring is fixed with the cage bottom shoulder (4 c).

7. A floating oil and gas production storage and offloading anchor chain connector according to claim 1, characterized in that a Y-connector (8) is fixed below the mandrel (5), the Y-connector (8) being used for: connecting the anchor chain with the mandrel (5).

8. A floating oil and gas production storage and offloading device anchor chain connector according to claim 7, characterized in that a connection hole (5a) is opened on the mandrel (5), a connection pin (9) is inserted in the connection hole (5a), and the Y-shaped connector (8) is connected with the mandrel (5) through the connection pin (9).

9. The floating oil and gas production storage and offloading device anchor chain connector as claimed in claim 8, characterized in that the end of one end of the connecting pin (9) is larger than the aperture of the connecting hole (5a), the other end of the connecting pin is provided with an external thread, the end of the connecting pin (9) provided with the external thread penetrates through the connecting hole (5a) and extends out of the Y-shaped connector (8), a locking nut (10) is sleeved on the external thread, and the locking nut (10) abuts against the Y-shaped connector (8).

10. The floating oil and gas production storage and offloading anchor chain connector of claim 9, characterized in that the side of the locknut (10) facing away from the Y-connector (8) is provided with a slip-off preventing pin (11), the slip-off preventing pin (11) being inserted into the connecting pin (9).