Large-caliber special thread waterproof guide pipe

Abstract

The utility model discloses a large-caliber special thread waterproof guide pipe which comprises a female connector, a pipe body and a male connector. An automatic anti-inversion device, an inner guide boring hole, an inner thread, a tail end sealing and positioning combined structure, an inner elevator circular bead and a female connector welding groove are sequentially arranged on the inner circumferential surface of the female connector from left to right, and the tail end sealing and positioning combined structure comprises an inner sealing conical surface, a sealing groove, a stress releasing groove and an inner sealing main circular bead. And the sealing groove is filled with an elastic sealing ring. According to the large-diameter casing pipe, the design of multiple threads is adopted, the screwing-on speed is high, efficiency is greatly improved, and the requirements for special well conditions such as the short time limit of a guide pipe under the complex marine underground condition are met; according to the utility model, a special thread structural design of double metal-to-metal sealing and triple sealing of elastic rubber and metal sealing is adopted, so that the sealing performance is greatly improved, and the sealing universality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas drilling and mining pipe thread connection technical field, concretely relates to a large -diameter special thread marine riser. BACKGROUND

[0002] Current earth land shallow layer petroleum resources have been basically exhausted, and coastal countries have turned to offshore oil drilling, and inland countries seek deep layer petroleum resources by improving drilling capacity. With the improvement of oil exploration technology and drilling equipment, the performance of the marine complex well condition to the oil and gas well guide pipe is higher.

[0003] The marine riser refers to the key equipment connecting the subsea blowout preventer and the offshore drilling platform, and is a connecting channel from the offshore drilling platform to the seabed. During drilling operation, the main function of the marine riser is to isolate seawater, form a circulating channel of drilling fluid, establish a channel for drilling tools to enter the formation, and the like.

[0004] The current marine riser has poor sealing performance, and the anti-inversion device is mostly installed at the wellhead on site, which is inconvenient to operate and has construction safety risks. Therefore, it is necessary to improve the structure of the current marine riser. UTILITY MODEL CONTENTS

[0005] In view of the technical problems that the current marine riser has poor sealing performance, and the anti-inversion device is mostly installed at the wellhead on site, which is inconvenient to operate and has construction safety risks, the purpose of the present application is to provide a large -diameter special thread marine riser.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows:

[0007] A large -diameter special thread marine riser, comprising a female joint, a pipe body and a male joint;

[0008] The inner circumferential surface of the female joint is sequentially provided with an automatic anti-inversion device, an inner guide bore, an internal thread, a tail end sealing and positioning combined structure, an inner elevator shoulder and a female joint welding bevel from left to right, the tail end sealing and positioning combined structure comprises an inner sealing cone surface, a sealing groove, a stress release groove and an inner sealing main shoulder, and the sealing groove is filled with an elastic sealing ring;

[0009] The pipe body is symmetrically provided with a welding bevel at both ends, and the left and right ends are respectively welded and connected with the female joint and the male joint;

[0010] The inner circumferential surface of the male joint is sequentially provided with an outer sealing main shoulder, an outer front guide surface, an outer sealing cone surface, an outer thread, an outer rear guide surface, an outer elevator shoulder and a male end welding bevel from right to left, and the outer rear guide surface is provided with a positioning insertion hole matched with the automatic anti-inversion device;

[0011] When the rotary engagement is used, the external thread of the male joint is screwed into the internal thread of the female joint, and as gradually screwed in, the external sealing main shoulder and the external front guide surface of the male joint are gradually contacted with the internal sealing main shoulder, the elastic sealing ring and the internal sealing taper surface of the female joint until the interference fit.

[0012] The automatic anti-reversing device comprises a plurality of anti-reversing components and a blocking ring and fastening screws, the anti-reversing components are uniformly arranged on the end face of the female joint, each anti-reversing component comprises a positioning cylinder and a spring, the spring is connected in a groove on the end face of the male joint, the outer side end of the spring is connected with the lower end of the positioning cylinder, the positioning cylinder is used in cooperation with a positioning insertion hole at a corresponding position, and the blocking ring is connected on the end face of the female joint through the fastening screws to limit the positioning cylinder.

[0013] The external thread and the internal thread are both tapered threads, the taper is 1:3, the pitch is 2.54 mm, the lead is 4x2.54 mm, the internal bearing angle is 5°, the internal front end guide angle is 45°, and the internal rear end guide angle is 30°.

[0014] The specification outer diameter of the pipe body is 339.7-711.2 mm, the outer diameter of the female joint is greater than the outer diameter of the male joint, and the outer diameter of the female joint is greater than the specification outer diameter.

[0015] The external rear guide surface and the internal guide bore are in clearance fit, and the clearance amount S is 0.05-0.15 mm.

[0016] The external thread and the internal thread are in clearance fit, and the clearance amount is 0.02-0.12 mm.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] (1) the large-diameter casing adopts the multi-start thread design, the make-up speed is fast, the efficiency is greatly improved, and the special well condition requirements such as time limit and emergency of the guide pipe under the complex condition of the ocean well are ensured.

[0019] (2) the utility model adopts the special thread structure design of the double metal-to-metal sealing and the three-seal special thread structure design of the elastic rubber and metal sealing, the sealing property is greatly improved and the sealing universality is improved.

[0020] (3) the utility model adopts the design of the automatic anti-reversing device, the anti-reversing and manual wellhead site installation operation can be avoided, the construction safety risk is reduced, and the construction safety reliability is greatly improved. DETAILED DESCRIPTION

[0021] Figure 1 Fig. 1 is a schematic structural diagram of the whole large-diameter casing according to the utility model;

[0022] Figure 2 Figure 1 shows a schematic diagram of a male joint provided by the embodiment of the utility model;

[0023] Figure 3 Figure 2 shows a schematic diagram of a pipe cross section provided by the embodiment of the utility model;

[0024] Figure 4 Figure 3 shows a schematic diagram of a female joint structure provided by the embodiment of the utility model;

[0025] Figure 5 Figure 4 shows a schematic diagram of a male joint structure provided by the embodiment of the utility model;

[0026] Figure 6 Figure 5 shows an enlarged schematic diagram of a male joint front end structure provided by the embodiment of the utility model;

[0027] Figure 7 Figure 6 shows a schematic diagram of internal and external thread engagement provided by the embodiment of the utility model;

[0028] Figure 8 Figure 7 shows a schematic diagram of an external thread tooth profile provided by the embodiment of the utility model;

[0029] Figure 9 Figure 8 shows a schematic diagram of a tail end sealing positioning combined structure provided by the embodiment of the utility model;

[0030] Figure 10 Figure 9 shows a schematic diagram of an automatic anti-inversion device structure provided by the embodiment of the utility model;

[0031] In the figure: 1-female joint, 2-pipe body, 3-male joint, 11-automatic anti-inversion device, 12-internal guide bore, 13-internal thread, 14-tail end sealing positioning combined structure, 15-internal hanger shoulder, 16-female joint welding bevel, 111-positioning cylinder, 112-stop ring, 113-spring, 114-fastening screw, 141-internal sealing cone surface, 142-sealing groove, 143-stress release groove, 144-internal sealing main shoulder, 1421-elastic sealing ring, 21-welding bevel, 30-external sealing main shoulder, 31-external front guide surface, 32-external sealing cone surface, 33-external thread, 34-external rear guide surface, 35-external hanger shoulder, 36-male end welding bevel, A-internal bearing angle, B-internal front end guide angle, b-internal rear end guide angle, P-pitch, D-specification outer diameter, D1-male joint outer diameter, D2-female joint outer diameter, S-clearance amount. DETAILED DESCRIPTION

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0035] like Figures 1-10 The diagram shows the structure of an embodiment provided by this utility model.

[0036] This embodiment provides a large-diameter special threaded water-proof conduit, comprising a female connector 1, a pipe body 2, and a male connector 3 connected in sequence;

[0037] The inner circumferential surface of the female connector 1 is provided with an automatic anti-reverse device 11, an inner guide boring hole 12, an internal thread 13, a tail end sealing and positioning assembly structure 14, an inner lifting shoulder 15, and a female connector welding bevel 16 from left to right. The tail end sealing and positioning assembly structure 14 includes an inner sealing cone surface 141, a sealing groove 142, a stress relief groove 143, and an inner sealing main shoulder 144. The sealing groove 142 is filled with an elastic sealing ring 1421.

[0038] The two ends of the pipe body 2 are symmetrically provided with welding bevels 21, and the left and right ends are welded to the female end welding bevel 16 of the female connector 1 and the male end welding bevel 36 of the male connector 3, respectively.

[0039] The inner circumferential surface of the male joint 3 is provided with, from right to left, an outer sealing main shoulder 30, an outer front guide surface 31, an outer sealing taper surface 32, an outer thread 33, an outer rear guide surface 34, an outer hanger shoulder 35, and a male end welding bevel 36. The outer rear guide surface 34 is provided with a positioning hole 341 on the outer circumference, which is used in cooperation with the automatic anti-reverse device 11.

[0040] In the rotary engagement, the male end of one catheter is connected to the female end of another catheter, the outer thread 33 of the male joint 3 is screwed into the inner thread 13 of the female joint 1, and as it is gradually screwed in, the outer sealing main shoulder 30, the outer front guide surface 31, and the outer sealing taper surface 32 of the male joint 3 gradually come into contact with the inner sealing main shoulder 144, the elastic sealing ring 1421, and the inner sealing taper surface 141 of the female joint 1 until they are in interference fit.

[0041] Preferably, the automatic anti-reverse device 11 includes a plurality of anti-reverse components and a blocking ring 112, fastening screws 114, which are uniformly arranged on the end surface of the female joint 1. Each anti-reverse component includes a positioning cylinder 111 and a spring 113. The spring 113 is connected in a groove on the end surface of the male joint 3, and the outer end of the spring 113 is connected to the lower end of the positioning cylinder 111. In the natural state, the outer end of the positioning cylinder 111 extends out of the groove. The positioning cylinder 111 is used in cooperation with the positioning hole 341 at the corresponding position. The blocking ring 112 is connected to the end surface of the female joint 1 by the fastening screws 114, and limits the positioning cylinder.

[0042] It should be noted that when the two catheters are connected, the positioning cylinder 111 is first pressed into the groove, and after reaching the position of the positioning hole 341, it is ejected by the action of the spring. The positioning cylinder 111 at the corresponding position is clamped into the positioning hole 341 at the corresponding position, forming rotary limiting, which can effectively prevent rotation.

[0043] Preferably, the outer thread 33 and the inner thread 13 are both tapered threads, with a taper of 1:3, a pitch P of 2.54 mm, a lead of 4x2.54 mm, an inner bearing angle A of 5°, an inner front end guide angle B of 45°, and an inner rear end guide angle B of 30°.

[0044] Preferably, the specification outer diameter D of the pipe body 2 is 339.7-711.2 mm, the outer diameter D2 of the female joint is greater than the outer diameter D1 of the male joint, which is greater than the specification outer diameter D.

[0045] Preferably, the outer rear guide surface 34 and the inner guide bore 12 are clearance fit, with a clearance S of 0.05-0.15 mm.

[0046] Preferably, the outer thread 33 and the inner thread 13 are clearance fit, with a clearance of 0.02-0.12 mm.

[0047] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A large diameter premium thread marine riser characterized by: It comprises a female joint (1), a pipe body (2) and a male joint (3); The inner circumferential surface of the female joint (1) is sequentially provided with an automatic anti-reverse device (11), an inner guide bore (12), an inner thread (13), a tail end sealing positioning combined structure (14), an inner hanging clamp shoulder (15) and a female joint welding bevel (16) from left to right, the tail end sealing positioning combined structure (14) comprises an inner sealing conical surface (141), a sealing groove (142), a stress release groove (143) and an inner sealing main shoulder (144), the sealing groove (142) is filled with an elastic sealing ring (1421). The pipe body (2) is symmetrically provided with welding bevels (21) on both ends, and the left and right ends are respectively welded to the female joint (1) and the male joint (3). The inner circumferential surface of the male joint (3) is sequentially provided with an outer sealing main shoulder (30), an outer front guide surface (31), an outer sealing conical surface (32), an outer thread (33), an outer rear guide surface (34), an outer hanging clamp shoulder (35) and a male joint welding bevel (36) from right to left, and the outer rear guide surface (34) is provided with a positioning insertion hole (341) matched with the automatic anti-reverse device (11) on the outer circumference. When the male joint (3) is used in rotation, the outer thread (33) of the male joint (3) is screwed into the inner thread (13) of the female joint (1), and as the male joint (3) is gradually screwed in, the outer sealing main shoulder (30), the outer front guide surface (31) and the outer sealing conical surface (32) of the male joint (3) are gradually in contact with the inner sealing main shoulder (144), the elastic sealing ring (1421) and the inner sealing conical surface (141) of the female joint (1) respectively until they are in interference fit.

2. A large diameter premium thread marine riser as defined in claim 1, characterized in that: The automatic anti-reverse device (11) comprises a plurality of anti-reverse components and a blocking ring (112) and a fastening screw (114) which are uniformly arranged on the end face of the female joint (1), each anti-reverse component comprises a positioning cylinder (111) and a spring (113), the spring (113) is connected in a groove on the end face of the male joint (3), the outer end of the spring (113) is connected with the lower end of the positioning cylinder (111), the positioning cylinder (111) is matched with the positioning insertion hole (341) at the corresponding position, and the blocking ring (112) is connected to the end face of the female joint (1) through the fastening screw (114) to limit the positioning cylinder.

3. A large diameter premium thread marine riser as defined in claim 1, wherein: The outer thread (33) and the inner thread (13) are both tapered threads, the taper = 1:3, the pitch (P) = 2.54 mm, the lead = 4x2.54 mm, the inner bearing angle (A) = 5°, the inner front end guide angle (B) = 45°, and the inner rear end guide angle (b) = 30°.

4. A large diameter premium thread marine riser as defined in claim 1, wherein: The specification outer diameter (D) of the pipe body (2) = 339.7-711.2 mm, the female joint outer diameter (D2) > the male joint outer diameter (D1) > the specification outer diameter (D).

5. A large diameter premium thread marine riser as defined in claim 1, wherein: The outer rear guide surface (34) and the inner guide bore (12) are gap matched, and the gap amount (S) = 0.05-0.15 mm.

6. A large diameter premium thread marine riser as defined in claim 1, wherein: The outer thread (33) and the inner thread (13) are gap matched, and the gap amount = 0.02-0.12 mm.

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