CN102900405A - Tieback assembly for marine underground wellhead - Google Patents

Abstract

Translated fromChinese

本发明公开了一种海洋水下井口头回接装置，主要由隔水导管和回接头、133/8〃套管和133/8〃套管回接头、95/8〃套管和95/8〃套管回接头及回接悬挂器等组成。当海洋水下井口头需要回接作业时，回接头通过锁紧块与海洋水下井口头实现锁固连接，回接头和海洋水下井口头之间通过密封Ⅴ和密封Ⅵ实现密封；133/8〃套管回接头通过螺纹与回接悬挂器连接，通过密封Ⅶ实现密封；95/8〃套管回接头通过连接环上的螺纹与回接悬挂器连接，通过金属密封实现环空密封。本发明结构紧凑、操作方便，较好地满足了海洋水下井口头回接工艺的要求。

The invention discloses a marine underwater wellhead tie-back device, which mainly consists of a water riser and a tie-back, a 133/8" casing and a 133/8" casing tie-back, a 95/8" casing and a 95/8" It is composed of casing tie-back joint and tie-back hanger. When the subsea wellhead head needs to be connected back, the back joint is locked and connected to the subsea wellhead through the locking block, and the seal between the back joint and the subsea wellhead is sealed by seal V and seal VI; 133/8″ sleeve The pipe return joint is connected with the tie-back hanger through threads, and the seal is realized through seal VII; the 95/8″ casing return joint is connected with the tie-back hanger through the thread on the connecting ring, and the annular space is sealed through the metal seal. The invention has the advantages of compact structure and convenient operation, and satisfies the requirements of the tie-back technology of the underwater well head in the ocean.

Description

Translated fromChinese

海洋水下井口头回接装置Marine subsea wellhead tie-back device

技术领域technical field

本发明属于海洋石油钻采装备技术领域，涉及一种海洋水下井口头回接装置。The invention belongs to the technical field of offshore oil drilling and production equipment, and relates to a tie-back device for an underwater wellhead head in an ocean.

背景技术Background technique

在浅海进行油气开采时，当钻井平台钻完一口井后，一般都采用固定式平台进行采油、采气作业，由于固定式平台和海洋水下井口头之间有很长一段距离，所以要采用海洋水下井口头回接装置来隔离海水，为固定式平台和海洋水下井口头之间建立一个油气通道。When oil and gas are exploited in shallow seas, after the drilling platform has drilled a well, the fixed platform is generally used for oil and gas production operations. Since there is a long distance between the fixed platform and the underwater wellhead in the ocean, the marine platform is used. The subsea wellhead tie-back device is used to isolate the seawater and establish an oil and gas channel between the fixed platform and the subsea wellhead.

海洋水下井口头回接装置是油气通道畅通的保证，其上端承接各层套管，下端连接海洋水下井口头，起到承上启下的作用。为确保安全和回接作业的质量，海洋水下井口头回接装置一般采用3层回接管柱，其作业程序一般是先回接隔水导管，然后回接133/8〃套管，最后回接95/8〃套管。当固定式平台安装好平台采油树后，在95/8〃套管回接管柱内下入油管便可进行采油、采气作业。The underwater wellhead tie-back device of the ocean is the guarantee for the smooth flow of oil and gas passages. Its upper end accepts casings of various layers, and the lower end connects the underwater wellhead of the ocean, which plays a role of connecting the previous and the next. In order to ensure the safety and the quality of the tie-back operation, the tie-back device of the marine subsea wellhead generally adopts a 3-layer tie-back string. The operation procedure is generally to tie back the riser first, then tie back the 133/8″ casing, and finally tie back the 95/8″ casing. After the platform Christmas tree is installed on the fixed platform, the oil production and gas production operations can be carried out by lowering the tubing into the 95/8″ casing tie-back string.

现有的这种海洋水下井口头回接装置与海洋水下井口头之间，由于距离长，连接操作复杂，工作效率低，影响了其广泛的应用。Due to the long distance between the existing marine underwater wellhead tie-back device and the marine underwater wellhead, the connection operation is complicated and the work efficiency is low, which affects its wide application.

发明内容Contents of the invention

本发明的目的是提供一种海洋水下井口头回接装置，解决了现有技术距离长，连接操作复杂，工作效率低的问题。The object of the present invention is to provide a tie-back device for marine underwater wellhead, which solves the problems of long distance, complicated connection operation and low work efficiency in the prior art.

本发明所采用的技术方案是，一种海洋水下井口头回接装置，The technical solution adopted in the present invention is a marine underwater wellhead tie-back device,

包括隔水导管和回接头，隔水导管通过螺纹和回接头连接，Including the riser and the return joint, the riser is connected by thread and the return joint,

回接头的结构是，从上到下依次包括上端盖、旋转环、支撑管、驱动块、上端连接块、导向座、下端连接块和锁紧块，The structure of the return joint is, from top to bottom, it includes an upper end cover, a rotating ring, a support tube, a driving block, an upper connecting block, a guide seat, a lower connecting block and a locking block,

所述的上端盖通过外台阶通孔中的螺栓与导向座固定连接，在上端盖与导向座之间的内圆台阶之间设置有旋转环，旋转环的内圆中部设置有凹槽；在上端盖与导向座之间的螺栓圆周上套装有支撑管，支撑管下段外圆周套装有驱动块；The upper end cover is fixedly connected to the guide seat through the bolts in the through hole of the outer step, and a rotating ring is arranged between the inner circular steps between the upper end cover and the guide seat, and a groove is arranged in the middle of the inner circle of the rotating ring; A support tube is set on the bolt circumference between the upper end cover and the guide seat, and a driving block is set on the outer circumference of the lower part of the support tube;

导向座下端与锁紧块、海洋水下井口头接触连接；The lower end of the guide seat is in contact with the locking block and the underwater well head;

上端连接块下端内圆周与下端连接块上端的外圆周套接，上端连接块的内圆周同时套装在上端盖外圆周、驱动块的外圆周上，下端连接块的内圆周同时套装在导向座外圆周和锁紧块外圆周上。The inner circumference of the lower end of the upper connecting block is socketed with the outer circumference of the upper end of the lower connecting block, the inner circumference of the upper connecting block is sleeved on the outer circumference of the upper end cover and the outer circumference of the driving block at the same time, and the inner circumference of the lower connecting block is sleeved outside the guide seat at the same time On the circumference and the outer circumference of the locking block.

本发明的有益效果是：通过专用工具驱动锁紧机构可实现海洋水下井口头回接装置和海洋水下井口头的锁固，通过驱动连接环可实现海洋水下井口头和固定式平台的金属对金属密封回接，为海洋水下井口头和固定式平台提供安全的油气通道，节约海洋石油的开发成本，缩短海上油气田投产的时间；结构紧凑、操作方便，较好地满足了海洋水下井口头回接工艺的要求。The beneficial effects of the present invention are: the locking mechanism of the marine underwater wellhead head and the marine underwater wellhead head can be locked by driving the locking mechanism with a special tool, and the metal-to-metal connection between the marine underwater wellhead head and the fixed platform can be realized by driving the connecting ring Sealed tie-backs provide safe oil and gas passages for offshore wellheads and fixed platforms, saving offshore oil development costs and shortening the production time of offshore oil and gas fields; compact structure and easy operation, which better meet the needs of marine underwater wellhead tie-backs Process requirements.

附图说明Description of drawings

图1是本发明海洋水下井口头回接装置的结构示意图；Fig. 1 is the structure schematic diagram of the marine underwater wellhead tie-back device of the present invention;

图2是本发明装置在回接133/8〃套管22时的结构示意图；Fig. 2 is the structural representation of device of the present invention when connecting back 133/8 " sleeve pipe 22;

图3是本发明装置在回接95/8〃套管27时的结构示意图。Fig. 3 is a schematic structural view of the device of the present invention when the 95/8 "sleeve 27 is connected back.

图中，1.隔水导管，2.回接头，3.上端盖，4.螺栓，5.密封Ⅰ，6.密封Ⅱ，7.旋转环，8.支撑管，9.凹槽，10.驱动块，11.上端连接块，12.密封Ⅲ，13.密封Ⅳ，14.导向座，15.密封Ⅴ，16.密封Ⅵ，17.下端连接块，18.锁紧块，19.海洋水下井口头，20.金属密封组合体，21.回接悬挂器，22.133/8〃套管，23.133/8〃套管回接头，24.密封Ⅶ，25.密封面A，26.斜面，27.95/8〃套管，28.转换接头，29.95/8〃套管回接头，30.金属密封，31.密封面B，32.台阶Ⅰ，33.连接环。In the figure, 1. Riser, 2. Return joint, 3. Upper end cover, 4. Bolt, 5. Seal Ⅰ, 6. Seal Ⅱ, 7. Rotary ring, 8. Support pipe, 9. Groove, 10. Drive block, 11. Upper connection block, 12. Seal III, 13. Seal IV, 14. Guide seat, 15. Seal V, 16. Seal VI, 17. Lower connection block, 18. Locking block, 19. Ocean water Downhole head, 20. Metal seal assembly, 21. Tieback hanger, 22.133/8″ casing, 23.133/8″ casing back joint, 24. Seal VII, 25. Sealing surface A, 26. Inclined surface, 27.95/ 8″ bushing, 28. Conversion joint, 29.95/8″ bushing return joint, 30. Metal seal, 31. Sealing surface B, 32. Step I, 33. Connecting ring.

具体实施方式Detailed ways

参照图1、图2、图3，本发明的海洋水下井口头回接装置结构是，包括隔水导管1和隔水导管的回接头2，隔水导管1通过螺纹和回接头2连接。回接头2从上到下为上端盖3、旋转环7、支撑管8、驱动块10、上端连接块11、导向座14、下端连接块17和锁紧块18；上端盖3通过外台阶通孔中的螺栓4与导向座14固定连接，在上端盖3与导向座14之间的内圆台阶之间设置有旋转环7，旋转环7的内圆中部设置有凹槽9，在上端盖3与导向座14之间的螺栓4圆周上套装有支撑管8（起支撑作用），支撑管8下段外圆周套装有驱动块10，导向座14下端与锁紧块18、海洋水下井口头19接触连接；上端连接块11下端内圆周与下端连接块17上端的外圆周套接，上端连接块11的内圆周同时套装在（紧压包裹）在上端盖3外圆周、驱动块10的外圆周上，下端连接块17的内圆周同时套装在（紧压包裹）导向座14外圆周和锁紧块18外圆周上；Referring to Fig. 1 , Fig. 2 and Fig. 3 , the structure of the underwater wellhead tie-back device of the present invention includes a riser 1 and ariser 2 , and the riser 1 is connected to the tie-back 2 by threads. From top to bottom, thereturn joint 2 is theupper end cover 3, the rotating ring 7, thesupport tube 8, thedriving block 10, the upperend connecting block 11, theguide seat 14, the lowerend connecting block 17 and thelocking block 18; theupper end cover 3 passes through the outer step. The bolt 4 in the hole is fixedly connected with theguide seat 14, and a rotating ring 7 is arranged between the inner circular steps between theupper end cover 3 and theguide seat 14, and agroove 9 is arranged in the middle of the inner circle of the rotating ring 7. The bolt 4 between 3 and theguide seat 14 is provided with a support tube 8 (supporting function), the outer circumference of the lower section of thesupport tube 8 is provided with adriving block 10, the lower end of theguide seat 14 is connected with thelocking block 18, and the marine underwater wellhead 19 Contact connection; the inner circumference of the lower end of the upper connectingblock 11 is socketed with the outer circumference of the upper end of the lower connectingblock 17, and the inner circumference of the upper connectingblock 11 is simultaneously sleeved (pressed and wrapped) on the outer circumference of theupper end cover 3 and the outer circumference of thedriving block 10 The inner circumference of the upper and lower connectingblocks 17 is simultaneously sleeved (pressed and wrapped) on the outer circumference of theguide seat 14 and the outer circumference of thelocking block 18;

回接头2上端的上端盖3与隔水导管1通过螺纹连接；回接头2下端的锁紧块18与海洋水下井口头19锁固连接；Theupper end cover 3 at the upper end of thereturn joint 2 is threadedly connected with the riser conduit 1; thelocking block 18 at the lower end of thereturn joint 2 is locked and connected with themarine underwater wellhead 19;

旋转环7上端外壁和上端盖3下端台阶内壁之间设置有密封Ⅰ5；旋转环7下端外壁和导向座14上端台阶内壁之间设置有密封Ⅳ13；上端盖3外壁与上端连接块11内壁接触面之间设置有密封Ⅱ6；下端连接块17内壁和导向座14外壁之间设置有密封Ⅲ12；海洋水下井口头19上端面及内圆周斜面与导向座14相应的接触面之间分别设置有密封Ⅴ15、密封Ⅵ16。A seal I5 is provided between the outer wall of the upper end of the rotating ring 7 and the inner wall of the lower step of theupper end cover 3; a seal IV13 is arranged between the outer wall of the lower end of the rotating ring 7 and the inner wall of the upper end step of theguide seat 14; the contact surface between the outer wall of theupper end cover 3 and the inner wall of the upper connecting block 11 A seal II6 is provided between them; a seal III12 is provided between the inner wall of the lower connectingblock 17 and the outer wall of theguide seat 14; a seal V15 is provided between the upper end surface of the marinesubsea wellhead head 19 and the inclined surface of the inner circumference and the corresponding contact surface of theguide seat 14 , Sealing Ⅵ16.

参照图2，回接头2和海洋水下井口头19的内腔中，用于下入133/8〃套管22、133/8〃套管回接头23和回接悬挂器21，133/8〃套管22下端外圆周与133/8〃套管回接头23上端内圆周通过套管螺纹扣连接，133/8〃套管回接头23下端外圆周与回接悬挂器21上端内圆周通过螺纹连接。Referring to Fig. 2, in the inner cavity of thetieback 2 and the marine submergedwellhead head 19, it is used to run into the 133/8 "casing pipe 22, 133/8" casing tieback 23 andtieback hanger 21, 133/8" The outer circumference of the lower end of thecasing 22 is connected with the inner circumference of the upper end of the 133/8″casing return joint 23 through a casing thread buckle, and the outer circumference of the lower end of the 133/8″casing return joint 23 is connected with the inner circumference of the upper end of thetieback hanger 21 through threads .

回接悬挂器21上端外圆周与海洋水下井口头19内圆周之间设置有金属密封组合体20，133/8〃套管回接头23与回接悬挂器21的密封面A25之间设置有密封Ⅶ24；回接悬挂器21的密封面A25下方设置有斜面26。Ametal seal assembly 20 is provided between the outer circumference of the upper end of thetieback hanger 21 and the inner circumference of the marine submergedwellhead head 19, and a seal is provided between the 133/8″ casing tieback 23 and the sealing surface A25 of thetieback hanger 21.VII 24 ; aslope 26 is provided below the sealing surface A25 of thetieback hanger 21 .

参照图3，133/8〃套管22和133/8〃套管回接头23内腔用于下入95/8〃套管27、转换接头28、95/8〃套管回接头29和连接环33，95/8〃套管27下端外圆周与转换接头28上端内圆周通过套管螺纹连接，转换接头28下端外圆周与95/8〃套管回接头29内圆周通过套管螺纹连接，95/8〃套管回接头29内圆周套装有连接环33，连接环33下端外圆周与回接悬挂器21通过螺纹连接；95/8〃套管回接头29下端坐在回接悬挂器21内表面的台阶Ⅰ32上，95/8〃套管回接头29下端外圆周与回接悬挂器21的密封面B31之间设置有金属密封30。Referring to Fig. 3, 133/8 "casing pipe 22 and 133/8 "casing return joint 23 lumens are used for entering 95/8 " casing 27, conversion joint 28, 95/8 " casing return joint 29 and connection Ring 33, the outer circumference of the lower end of the 95/8" casing 27 is connected with the inner circumference of the upper end of the conversion joint 28 through the sleeve thread, and the outer circumference of the lower end of the conversion joint 28 is connected with the inner circumference of the 95/8" sleeve return joint 29 through the sleeve thread, The inner circumference of the 95/8″ casing return joint 29 is fitted with a connecting ring 33, and the outer circumference of the lower end of the connecting ring 33 is threadedly connected with the tie-back hanger 21; the lower end of the 95/8″ casing return joint 29 sits on the tie-back hanger 21 On the step I32 of the inner surface, a metal seal 30 is provided between the outer circumference of the lower end of the 95/8″ casing tieback 29 and the sealing surface B31 of thetieback hanger 21 .

导向座14下端圆周设置有安装锁紧块18的孔，导向座14底部设置有方便插入海洋水下井口头19外沿的导向喇叭口。The circumference of the lower end of theguide seat 14 is provided with a hole for installing the lockingblock 18, and the bottom of theguide seat 14 is provided with a guide bell mouth conveniently inserted into the outer edge of theunderwater wellhead head 19 in the ocean.

锁紧块18设置有与海洋水下井口头19上端外圆周相配的锁紧齿形面。The lockingblock 18 is provided with a locking tooth-shaped surface matched with the outer circumference of the upper end of the marine submergedwellhead head 19 .

95/8〃套管回接头29和回接悬挂器21之间的金属密封30为直插式、旋转挤压金属密封结构。The metal seal 30 between the 95/8″ casing tieback 29 and thetieback hanger 21 is an in-line, rotary extrusion metal seal structure.

本发明装置的工作原理是，当海洋水下井口头需要回接到固定式平台进行平台上采油气时，根据油田钻井工艺要求，金属密封组合体20和回接悬挂器21与油层套管一起下入井口，坐在海洋水下井口头内，经试压合格后，进行回接作业。在执行回接作业前首先要对每一个回接头螺纹及密封进行检查，并彻底清洗，涂上黄油。其次，要对每一个回接头及专用工具等的功能进行检查，验证回接头的锁紧情况及专用工具的旋转位置。海洋水下井口头回接的顺序一般是从大尺寸套管到小尺寸套管，即先回接隔水导管1，然后回接133/8〃套管22，最后回接95/8〃套管27。The working principle of the device of the present invention is that when the underwater wellhead in the ocean needs to be connected back to the fixed platform for oil and gas production on the platform, according to the oil field drilling process requirements, themetal seal assembly 20 and the tie-back hanger 21 are lowered together with the oil layer casing Enter the wellhead, sit in the subsea wellhead, and perform tie-back operation after passing the pressure test. Before performing the tie-back operation, the thread and seal of each tie-back joint should be inspected, cleaned thoroughly, and buttered. Secondly, it is necessary to check the function of each return joint and special tool, and verify the locking condition of the return joint and the rotation position of the special tool. The sequence of tie-backs of marine subsea wellheads is generally from the large-size casing to the small-size casing, that is, the riser 1 is connected first, then the 133/8″casing 22 is connected back, and the 95/8″ casing is connected back at last 27.

本发明装置的回接工作过程是，The tie-back working process of the device of the present invention is,

1）如图1所示，当固定式平台安装好后，经检验海洋水下井口头19和回接悬挂器21之间的金属密封组合体20的密封性安全可靠后，在ROV的帮助下，回接头2随着隔水导管1一起下入，直至回接头2坐在海洋水下井口头19上。此时，密封Ⅴ15和密封Ⅵ16分别与海洋水下井口头19上端面及内圆周斜面很好贴合，形成密封。然后，从固定式平台上下入专用工具，插入回接头2内腔的凹槽9内，对回接头2的锁紧机构施加正扣扭矩，驱动锁紧块18进入海洋水下井口头19上端外圆周锁紧凹槽中，使得回接头2锁紧海洋水下井口头19。经试压合格，预提后按设计要求切割隔水导管1，安装203/4〃平台井口套管头，完成隔水导管1的回接。1) As shown in Figure 1, after the fixed platform is installed, after checking that the sealing performance of themetal seal assembly 20 between the marinesubsea wellhead 19 and thetieback hanger 21 is safe and reliable, with the help of ROV, The tie-back 2 is lowered together with the riser 1 until the tie-back 2 sits on the submergedwell head 19 in the ocean. At this time, the seal V15 and the seal VI16 are in good contact with the upper surface of the marinesubsea wellhead head 19 and the inclined surface of the inner circumference respectively to form a seal. Then, insert the special tool from the fixed platform, insert it into thegroove 9 of the inner cavity of the return joint 2, apply positive buckle torque to the locking mechanism of the return joint 2, and drive the lockingblock 18 to enter the outer circumference of the upper end of theunderwater wellhead head 19 in the ocean. In the locking groove, the return joint 2 locks the marine submerged wellhead 19. After the pressure test is qualified, the riser 1 is cut according to the design requirements, and the 203/4″ platform wellhead casing head is installed to complete the tie-back of the riser 1.

2）如图2所示，当133/8〃套管回接头23随着133/8〃套管22下放到位后，133/8〃套管回接头23下端外圆周的螺纹公扣和回接悬挂器21上端内圆周螺纹母扣相啮合。然后，利用133/8〃套管22的大钳工具旋转133/8〃套管22，使得133/8〃套管回接头23向下移动，直至133/8〃套管回接头23下端坐在回接悬挂器21的斜面26上。此时，133/8〃套管回接头23下端外圆周和回接悬挂器21上端密封面A25很好贴合，使得密封Ⅶ24与回接悬挂器21上端密封面A25形成密封。经试压合格，预提后，坐卡瓦，按设计要求切割，安装203/4〃×135/8〃平台井口套管头，完成133/8〃套管22的回接。2) As shown in Figure 2, when the 133/8″ casing return joint 23 is lowered into place along with the 133/8″casing 22, the threaded male buckle and the return connection at the outer circumference of the lower end of the 133/8″ casing return joint 23 The inner circumferential thread box at the upper end of thehanger 21 is engaged with each other. Then, use the tong tool of the 133/8"casing 22 to rotate the 133/8"casing 22 so that the 133/8" casing back fitting 23 moves down until the lower end of the 133/8" casing back fitting 23 sits on the Tie back on theslope 26 of thehanger 21. At this time, the outer circumference of the lower end of the 133/8″ casing tie-back 23 and the upper sealing surface A25 of the tie-back hanger 21 fit well, so that the seal VII24 forms a seal with the upper sealing surface A25 of the tie-back hanger 21. After passing the pressure test and pre-lifting, sit on the slips, cut according to the design requirements, install the 203/4″×135/8″ platform wellhead casing head, and complete the tie-back of the 133/8″casing 22.

3）如图3所示，95/8〃套管回接头29、金属密封30、转换接头28和连接环33装配好后随着95/8〃套管27下放，直至95/8〃套管回接头29下端坐在回接悬挂器21台阶Ⅰ32上。然后，从固定式平台下入专用工具，插入连接环33的凹槽上，继续下放专用工具，使得连接环33螺纹公扣和回接悬挂器21下端内圆周螺纹母扣相啮合。然后，利用专用工具对连接环33施加正扣扭矩，使得连接环33向下移动，通过旋转挤压使得金属密封30产生变形。此时，金属密封30和回接悬挂器21密封面B31很好贴合，形成密封。经试压合格，预提后，坐卡瓦，按设计要求切割，安装135/8〃×11〃平台井口套管头，完成95/8〃套管27的回接。3) As shown in Figure 3, after the 95/8″ casing return joint 29, the metal seal 30, the conversion joint 28 and the connecting ring 33 are assembled, they are lowered along with the 95/8″ casing 27 until the 95/8″ casing The lower end of the tieback 29 sits on the step I32 of thetieback hanger 21. Then, the special tool is lowered from the fixed platform, inserted into the groove of the connecting ring 33, and the special tool is continued to be lowered, so that the connecting ring 33 threaded male buckle and thetieback hanger 21 lower end inner circumferential threaded female buckle are engaged. Then, a positive buckling torque is applied to the connecting ring 33 by using a special tool, so that the connecting ring 33 moves downward, and the metal seal 30 is deformed by rotating and pressing. At this time, the metal seal 30 and the sealing surface B31 of the tie-back hanger 21 fit well to form a seal. After passing the pressure test and pre-lifting, sit on the slips, cut according to the design requirements, install the 135/8″×11″ platform wellhead casing head, and complete the tie-back of the 95/8″ casing 27.

Claims (7)

Translated fromChinese

1.一种海洋水下井口头回接装置，其特征在于：1. A marine underwater wellhead tie-back device, characterized in that:包括隔水导管（1）和回接头（2），隔水导管（1）通过螺纹和回接头（2）连接，Including the water riser (1) and the return joint (2), the water riser (1) is connected with the return joint (2) through threads,回接头（2）的结构是，从上到下依次包括上端盖（3）、旋转环（7）、支撑管（8）、驱动块（10）、上端连接块（11）、导向座（14）、下端连接块（17）和锁紧块（18），The structure of the return joint (2) is that, from top to bottom, it includes an upper end cover (3), a rotating ring (7), a support tube (8), a driving block (10), an upper connecting block (11), a guide seat (14 ), the lower connection block (17) and the locking block (18),所述的上端盖（3）通过外台阶通孔中的螺栓（4）与导向座（14）固定连接，在上端盖（3）与导向座（14）之间的内圆台阶之间设置有旋转环（7），旋转环（7）的内圆中部设置有凹槽（9）；在上端盖（3）与导向座（14）之间的螺栓（4）圆周上套装有支撑管（8），支撑管（8）下段外圆周套装有驱动块（10）；The upper end cover (3) is fixedly connected with the guide seat (14) through the bolt (4) in the through hole of the outer step, and an inner circular step between the upper end cover (3) and the guide seat (14) is provided The rotating ring (7), the middle part of the inner circle of the rotating ring (7) is provided with a groove (9); the support tube (8) is set on the circumference of the bolt (4) between the upper end cover (3) and the guide seat (14) ), the outer circumference of the lower section of the support tube (8) is set with a drive block (10);导向座（14）下端与锁紧块（18）、海洋水下井口头（19）接触连接；The lower end of the guide seat (14) is in contact with the locking block (18) and the marine underwater wellhead (19);上端连接块（11）下端内圆周与下端连接块（17）上端的外圆周套接，上端连接块（11）的内圆周同时套装在上端盖（3）外圆周、驱动块（10）的外圆周上，下端连接块（17）的内圆周同时套装在导向座（14）外圆周和锁紧块（18）外圆周上。The inner circumference of the lower end of the upper connecting block (11) is socketed with the outer circumference of the upper end of the lower connecting block (17), and the inner circumference of the upper connecting block (11) is sleeved on the outer circumference of the upper end cover (3) and the outer circumference of the driving block (10). On the circumference, the inner circumference of the lower connecting block (17) is sleeved on the outer circumference of the guide seat (14) and the outer circumference of the locking block (18) at the same time.2.根据权利要求1所述的海洋水下井口头回接装置，其特征在于：所述的旋转环（7）上端外壁和上端盖（3）下端台阶内壁之间设置有密封Ⅰ（5）；2. The marine underwater wellhead tie-back device according to claim 1, characterized in that: a seal I (5) is provided between the outer wall of the upper end of the rotating ring (7) and the inner wall of the lower end step of the upper end cover (3);旋转环（7）下端外壁和导向座（14）上端台阶内壁之间设置有密封Ⅳ（13）；A seal IV (13) is provided between the outer wall of the lower end of the rotating ring (7) and the inner wall of the upper end of the guide seat (14);上端盖（3）外壁与上端连接块（11）内壁接触面之间设置有密封Ⅱ（6）；A seal II (6) is provided between the outer wall of the upper end cover (3) and the inner wall contact surface of the upper connecting block (11);下端连接块（17）内壁和导向座（14）外壁之间设置有密封Ⅲ（12）；A seal III (12) is provided between the inner wall of the lower connecting block (17) and the outer wall of the guide seat (14);海洋水下井口头（19）上端面及内圆周斜面与导向座（14）相应的接触面之间分别设置有密封Ⅴ（15）、密封Ⅵ（16）。A seal V (15) and a seal VI (16) are respectively arranged between the upper end face of the marine subsea wellhead (19) and the inclined surface of the inner circumference and the corresponding contact surfaces of the guide seat (14).3.根据权利要求1或2所述的海洋水下井口头回接装置，其特征在于：所述的回接头（2）上端的上端盖（3）与隔水导管（1）通过螺纹连接；回接头（2）下端的锁紧块（18）与海洋水下井口头（19）锁固连接。3. The marine underwater wellhead tieback device according to claim 1 or 2, characterized in that: the upper end cover (3) at the upper end of the tieback (2) is threadedly connected to the riser conduit (1); The locking block (18) at the lower end of the joint (2) is locked and connected with the marine underwater wellhead (19).4.根据权利要求3所述的海洋水下井口头回接装置，其特征在于：所述的导向座（14）下端圆周设置有安装锁紧块（18）的孔，导向座（14）底部设置有导向喇叭口。4. The marine underwater wellhead tie-back device according to claim 3, characterized in that: a hole for installing a locking block (18) is provided on the circumference of the lower end of the guide seat (14), and a hole is provided at the bottom of the guide seat (14). There is a guide bell.5.根据权利要求4所述的海洋水下井口头回接装置，其特征在于：所述的锁紧块（18）设置有与海洋水下井口头（19）上端外圆周相配的锁紧齿形面。5. The marine underwater wellhead tie-back device according to claim 4, characterized in that: the locking block (18) is provided with a locking tooth-shaped surface matching the outer circumference of the upper end of the marine underwater wellhead (19) .6.根据权利要求5所述的海洋水下井口头回接装置，其特征在于：所述的回接头（2）和海洋水下井口头（19）的内腔中，用于下入13 3/8〃套管（22）、13 3/8〃套管回接头（23）、金属密封组合体（20）和回接悬挂器（21），13 3/8〃套管（22）下端外圆周与13 3/8〃套管回接头（23）上端内圆周通过套管螺纹扣连接，13 3/8〃套管回接头（23）下端外圆周与回接悬挂器（21）上端内圆周通过螺纹连接；6. The marine underwater wellhead tie-back device according to claim 5, characterized in that: said tie-back (2) and the inner cavity of the marine underwater wellhead (19) are used for running 13 3/8 〃casing (22), 13 3/8〃casing return joint (23), metal seal combination (20) and tie-back hanger (21), 13 3/8〃casing (22) lower end outer circumference and The inner circumference of the upper end of the 13 3/8″ casing return joint (23) is connected by the casing thread buckle, and the outer circumference of the lower end of the 13 3/8″ casing return joint (23) is connected with the inner circumference of the upper end of the tie-back hanger (21) through the thread connect;回接悬挂器（21）上端外圆周与海洋水下井口头（19）内圆周之间设置有金属密封组合体（20），13 3/8〃套管回接头（23）与回接悬挂器（21）的密封面A（25）之间设置有密封Ⅶ（24）；回接悬挂器（21）的密封面A（25）下方设置有斜面（26）。A metal seal assembly (20) is arranged between the outer circumference of the upper end of the tie-back hanger (21) and the inner circumference of the marine underwater wellhead (19), and the 13 3/8 "casing tie-back (23) and the tie-back hanger ( A seal VII (24) is provided between the sealing surfaces A (25) of 21); a slope (26) is provided below the sealing surface A (25) of the tieback hanger (21).7.根据权利要求6所述的海洋水下井口头回接装置，其特征在于：所述的13 3/8〃套管（22）和13 3/8〃套管回接头（23）内腔用于下入9 5/8〃套管（27）、转换接头（28）、9 5/8〃套管回接头（29）和连接环（33），9 5/8〃套管（27）下端外圆周与转换接头（28）上端内圆周通过套管螺纹连接，转换接头（28）下端外圆周与9 5/8〃套管回接头（29）内圆周通过套管螺纹连接，9 5/8〃套管回接头（29）内圆周套装有连接环（33），连接环（33）下端外圆周与回接悬挂器（21）通过螺纹连接；9 5/8〃套管回接头（29）下端坐在回接悬挂器（21）内表面的台阶Ⅰ（32）上，9 5/8〃套管回接头（29）下端外圆周与回接悬挂器（21）的密封面B（31）之间设置有金属密封（30）。7. The marine underwater wellhead head tie-back device according to claim 6, characterized in that: the inner cavity of the 13 3/8" casing (22) and the 13 3/8" casing tie-back (23) is used Insert the 9 5/8″ casing (27), adapter (28), 9 5/8″ casing return joint (29) and connecting ring (33), the lower end of the 9 5/8″ casing (27) The outer circumference and the inner circumference of the upper end of the conversion joint (28) are connected through casing threads, and the outer circumference of the lower end of the conversion joint (28) is connected with the inner circumference of the 9 5/8″ casing return joint (29) through casing threads, 9 5/8 〃The inner circumference of the casing return joint (29) is fitted with a connecting ring (33), and the outer circumference of the lower end of the connecting ring (33) is threadedly connected with the tie-back hanger (21); 9 5/8″ casing return joint (29) The lower end sits on the step I (32) of the inner surface of the tieback hanger (21), the outer circumference of the lower end of the 9 5/8″ casing tieback (29) and the sealing surface B (31) of the tieback hanger (21) A metal seal (30) is arranged between them.

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