Adjustable catheter

Abstract

The utility model relates to an adjustable guide pipe, and relates to the technical field of offshore drilling. The adjustable guide pipe comprises an upper guide pipe, a lower guide pipe, a sealing mechanism and a locking mechanism, the upper guide pipe is inserted into the lower guide pipe and can move in the lower guide pipe, the sealing mechanism comprises a sealing seat and a sealing sleeve, the sealing seat is fixedly arranged at the top end of the lower guide pipe, the sealing sleeve is arranged on the sealing seat, and the locking mechanism is arranged on the sealing seat. A hydraulic cavity is formed in the side, away from the upper guide pipe, of the sealing sleeve, the locking mechanism comprises a limiting seat, a mounting seat, a connecting rod and a plurality of hydraulic clamping jaws, the limiting seat surrounds the outer wall of the upper guide pipe and is connected with the top of the sealing seat, and the mounting seat is fixed to the upper portion of the limiting seat through the connecting rod and surrounds the outer wall of the upper guide pipe; the top end of the hydraulic clamping jaw is hinged to the mounting base, one side of the hydraulic clamping jaw abuts against the limiting base, and the hydraulic clamping jaw can clamp the outer wall of the upper guide pipe so as to fix the upper guide pipe. The adjustable catheter has the advantages of being easy to operate and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore drilling, and particularly to an adjustable conduit. Background Art

[0002] During offshore drilling operations, a blowout preventer needs to be installed at the wellhead. The specifications of the blowout preventers installed in different well conditions are different, and thus the distance from its upper flange to the drilling platform is different. Therefore, it is usually necessary to cut a conduit of a suitable length or add a connecting conduit according to this distance and install it between the upper flange of the blowout preventer and the drilling platform to collect mud and prevent the returned mud from flowing into the sea.

[0003] For example, the Chinese patent with the publication number CN216767317U discloses a mud collector for a riser. After a section of casing is cut and connected to another section of casing, it is also necessary to additionally provide a collecting part to collect mud, and the mud collected in the accommodating cavity also needs to be discharged to the outside of the collecting part through a drain pipe, with complex operations and inconvenient use. Summary of the Utility Model

[0004] The utility model provides an adjustable conduit, which can expand and contract according to the distance between the blowout preventer and the drilling platform to change the length, and is simple and convenient to operate.

[0005] The utility model provides an adjustable conduit, including an upper conduit, a lower conduit, a sealing mechanism and a locking mechanism. The upper conduit is inserted into the interior of the lower conduit and can move inside the lower conduit. The sealing mechanism includes a sealing seat and a sealing sleeve. The sealing seat is fixedly arranged at the top end of the lower conduit, the sealing sleeve is arranged on the sealing seat, and a hydraulic cavity is arranged on the side of the sealing sleeve facing away from the upper conduit. The locking mechanism includes a limiting seat, a mounting seat, a connecting rod and a plurality of hydraulic jaws. The limiting seat is arranged around the outer wall of the upper conduit and is connected to the top of the sealing seat. The mounting seat is fixed above the limiting seat through the connecting rod and surrounds the outer wall of the upper conduit. The top end of the hydraulic jaw is hinged to the mounting seat, one side of the hydraulic jaw abuts against the limiting seat, and the hydraulic jaw can clamp the outer wall of the upper conduit to fix the upper conduit.

[0006] In one embodiment, the hydraulic jaw includes a hydraulic cylinder and a slip jaw. The top end of the hydraulic cylinder is hinged to the mounting seat, and the bottom end of the hydraulic cylinder is hinged to the slip jaw.

[0007] In one embodiment, a first inclined surface is arranged on the side of the slip jaw facing away from the upper conduit, and a second inclined surface is arranged on the limiting seat. The first inclined surface abuts against the second inclined surface.

[0008] In one embodiment, the adjustable catheter further includes a hydraulic station and a hydraulic pipe. The hydraulic jaws and the sealing mechanism are both connected to the hydraulic station through the hydraulic pipe. The hydraulic oil enters and exits the hydraulic cavity to selectively abut the sealing sleeve against the outer wall of the upper catheter.

[0009] In one embodiment, the sealing seat includes a main housing, a first fixing ring, and a second fixing ring. The first fixing ring and the second fixing ring are respectively arranged at the upper and lower ends of the main housing. The upper end of the sealing sleeve is fixed between the first fixing ring and the main housing, and the lower end of the sealing sleeve is fixed between the second fixing ring and the main housing.

[0010] In one embodiment, the hydraulic cavity is arranged between the main housing and the sealing sleeve, and the main housing is further provided with a through hole communicating with the hydraulic cavity.

[0011] In one embodiment, a first sealing ring is arranged between the first fixing ring and the main housing, and a second sealing ring is arranged between the second fixing ring and the main housing.

[0012] In one embodiment, the side of the sealing sleeve close to the upper catheter is wavy.

[0013] In one embodiment, the hydraulic jaws are arranged at equal intervals around the outer wall of the upper catheter.

[0014] In one embodiment, a connecting rod is arranged on both sides of each hydraulic jaw.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: When the hydraulic jaws do not clamp the outer wall of the upper catheter, the upper catheter inserted into the lower catheter can move up and down, so that the position can be adjusted according to the distance from the upper flange of the blowout preventer to the drilling platform. When the position is determined, the hydraulic jaws approach the outer wall of the upper catheter under the guidance of the limit seat and clamp the upper catheter, so that the upper catheter will no longer displace. When the positions of the upper catheter and the lower catheter are determined, hydraulic oil is injected into the hydraulic cavity of the sealing seat to make the sealing sleeve close to the outer wall of the upper catheter, thereby achieving sealing and avoiding mud leakage. The adjustable catheter of the present utility model has the advantages of simple operation and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, the present utility model will be described in more detail based on embodiments and with reference to the drawings.

[0017] Figure 1 is a front view schematic diagram of the adjustable catheter in the embodiment of the present utility model;

[0018] Figure 2It is one of the half-section structural diagrams of the adjustable catheter in the embodiment of the utility model;

[0019] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0020] Figure 4 This is the second half-section structural diagram of the adjustable catheter in the embodiment of the utility model;

[0021] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0022] Reference numerals:

[0023] 1. Upper conduit; 2. Lower conduit; 3. Sealing mechanism; 31. Sealing seat; 311. Main shell; 3111. Through hole; 312. First fixing ring; 313. Second fixing ring; 32. Sealing sleeve; 33. Hydraulic chamber; 34. First sealing ring; 35. Second sealing ring; 4. Locking mechanism; 41. Limiting seat; 411. Second inclined plane; 42. Mounting seat; 43. Connecting rod; 44. Hydraulic clamp; 441. Hydraulic cylinder; 442. Cava teeth; 4421. First inclined plane; 5. Hydraulic station; 6. Hydraulic pipe. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 3 As shown, the adjustable catheter of one embodiment of the utility model includes an upper catheter 1, a lower catheter 2, a sealing mechanism 3 and a locking mechanism 4. The upper catheter 1 is inserted into the interior of the lower catheter 2 and can move inside the lower catheter 2. The sealing mechanism 3 includes a sealing seat 31 and a sealing sleeve 32. The sealing seat 31 is fixedly arranged on the top end of the lower catheter 2. The sealing sleeve 32 is arranged on the sealing seat 31. The sealing sleeve 32 is in the shape of an annular belt as a whole, and is surrounded by the outer periphery of the upper conduit 1. A hydraulic chamber 33 is provided on the side of the sealing sleeve 32 away from the upper conduit 1. The locking mechanism 4 includes a limit seat 41, a mounting seat 42, a connecting rod 43 and a plurality of hydraulic clamps 44. The limit seat 41 is arranged around the outer wall of the upper conduit 1 and is connected to the top of the sealing seat 31. The mounting seat 42 is fixed on the top of the limit seat 41 by the connecting rod 43 and surrounds the outer wall of the upper conduit 1. The top of the hydraulic clamp 44 is hinged to the mounting seat 42, and one side of the hydraulic clamp 44 abuts against the limit seat 41. The hydraulic clamp 44 can clamp the outer wall of the upper conduit 1 to fix the upper conduit 1.

[0026] When the hydraulic clamp 44 does not clamp the outer wall of the upper conduit 1, the upper conduit 1 inserted into the lower conduit 2 can move up and down, so that the position can be adjusted according to the distance from the upper flange of the well plug to the drilling platform. Figure 4 and Figure 5As shown, when the position is determined, the hydraulic clamp 44 approaches the outer wall of the upper conduit 1 under the guidance of the limit seat 41 and clamps the upper conduit 1, so that the upper conduit 1 will not be displaced. When the positions of the upper conduit 1 and the lower conduit 2 are determined, hydraulic oil is injected into the hydraulic cavity 33 of the sealing seat 31 to make the sealing sleeve 32 close to the outer wall of the upper conduit 1, thereby achieving sealing and preventing mud leakage. The adjustable conduit of the utility model has the advantages of simple operation and easy use.

[0027] In this embodiment, the hydraulic clamps 44 are arranged at equal intervals around the outer wall of the upper conduit 1 , so that the clamping force on the outer wall of the upper conduit 1 is more uniform, which is less likely to cause deformation of the upper conduit 1 .

[0028] like Figure 1 As shown, a connecting rod 43 is provided on both sides of each hydraulic clamp 44 , so that the mounting seat 42 can be stably and reliably supported and can stably carry the hydraulic clamp 44 .

[0029] like Figure 2 As shown, the hydraulic clamp 44 includes a hydraulic cylinder 441 and a slip tooth 442. The top end of the hydraulic cylinder 441 is hinged to the mounting seat 42, and the bottom end of the hydraulic cylinder 441 is hinged to the slip tooth 442. The hydraulic cylinder 441 can drive the slip tooth 442 to move downward. When the slip tooth 442 moves downward, the limit seat 41 on one side of the slip tooth 442 makes the slip tooth 442 approach the upper conduit 1 and finally clamp the outer wall of the upper conduit 1. Each hydraulic clamp 44 moves synchronously, so that each slip tooth 442 can clamp the upper conduit 1 synchronously. In the process of the hydraulic clamp 44 clamping the upper conduit 1, the slip tooth 442 moves obliquely downward, so that the hydraulic cylinder 441 will deflect to the side where the upper conduit 1 is located. Therefore, the upper and lower ends of the hydraulic cylinder 441 need to be hinged to the mounting seat 42 and the slip tooth 442 respectively, so that the hydraulic cylinder 441 can deflect smoothly.

[0030] like Figure 2 and Figure 3 As shown, specifically, the first inclined surface 4421 is provided on the side of the slip tooth 442 away from the upper conduit 1, and the second inclined surface 411 is provided on the limit seat 41, and the first inclined surface 4421 abuts against the second inclined surface 411. Through the interaction between the first inclined surface 4421 and the second inclined surface 411, the slip tooth 442 moving downward is simultaneously translated toward the side where the upper conduit 1 is located, and finally clamps the outer wall of the upper conduit 1.

[0031] like Figure 1 As shown, the adjustable conduit of this embodiment further includes a hydraulic station 5 and a hydraulic pipe 6. The hydraulic clamp 44 and the sealing mechanism 3 are both connected to the hydraulic station 5 through the hydraulic pipe 6. The hydraulic oil enters and exits the hydraulic chamber 33 to selectively contact the sealing sleeve 32 with the outer wall of the upper conduit 1. Figure 4 and Figure 5As shown, after the hydraulic oil enters the hydraulic chamber 33, it will press the sealing sleeve 32, causing the sealing sleeve 32 to tightly adhere to the outer wall of the upper conduit 1. When the hydraulic oil is withdrawn from the hydraulic chamber 33, the sealing sleeve 32 disengages from the upper conduit 1 and returns to its initial state. After the hydraulic oil is injected into the hydraulic cylinder 441, the hydraulic cylinder 441 will elongate, causing the slip teeth 442 to move downward. When it is necessary to disengage the slip teeth 442 from the upper conduit 1, the hydraulic cylinder 441 shortens, causing the slip teeth 442 to return to their initial state.

[0032] As Figure 3 and Figure 5 shown, the sealing seat 31 includes a main housing 311, a first fixing ring 312, and a second fixing ring 313. The first fixing ring 312 and the second fixing ring 313 are respectively arranged at the upper and lower ends of the main housing 311. The upper end of the sealing sleeve 32 is fixed between the first fixing ring 312 and the main housing 311, and the lower end of the sealing sleeve 32 is fixed between the second fixing ring 313 and the main housing 311. The first fixing ring 312 and the second fixing ring 313 fix and seal both the upper and lower ends of the sealing sleeve 32. When the hydraulic oil is injected into the hydraulic chamber 33, the upper and lower ends of the sealing sleeve 32 will not move, and the sealing sleeve 32 is effectively fixed and can prevent the leakage of hydraulic oil.

[0033] Furthermore, the hydraulic chamber 33 is arranged between the main housing 311 and the sealing sleeve 32. The main housing 311 is also provided with a through hole 3111 communicating with the hydraulic chamber 33. The hydraulic oil in the hydraulic pipe 6 is injected into the hydraulic chamber 33 through the through hole 3111.

[0034] As Figure 3 and Figure 5 shown, a first sealing ring 34 is provided between the first fixing ring 312 and the main housing 311, and a second sealing ring 35 is provided between the second fixing ring 313 and the main housing 311. By providing the first sealing ring 34 and the second sealing ring 35, the sealing performance can be further enhanced, and the situation of mud leakage can be avoided.

[0035] As Figure 3 and Figure 5 shown, the side of the sealing sleeve 32 close to the upper conduit 1 is wavy. Such a sealing sleeve 32 can form multiple seals with the outer wall of the upper conduit 1, achieving a better sealing effect.

[0036] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An adjustable catheter, characterized in that: The utility model comprises an upper conduit, a lower conduit, a sealing mechanism and a locking mechanism, wherein the upper conduit is inserted into the interior of the lower conduit and can move inside the lower conduit, the sealing mechanism comprises a sealing seat and a sealing sleeve, the sealing seat is fixedly arranged at the top end of the lower conduit, the sealing sleeve is arranged on the sealing seat, a hydraulic chamber is arranged on the side of the sealing sleeve away from the upper conduit, the locking mechanism comprises a limit seat, a mounting seat, a connecting rod and a plurality of hydraulic clamps, the limit seat is arranged around the outer wall of the upper conduit and is connected to the top of the sealing seat, the mounting seat is fixed above the limit seat by the connecting rod and surrounds the outer wall of the upper conduit, the top end of the hydraulic clamp is hinged to the mounting seat, one side of the hydraulic clamp abuts against the limit seat, and the hydraulic clamp can clamp the outer wall of the upper conduit to fix the upper conduit.

2. The adjustable catheter according to claim 1, characterized in that The hydraulic clamp comprises a hydraulic cylinder and a slip tooth, the top end of the hydraulic cylinder is hinged to the mounting seat, and the bottom end of the hydraulic cylinder is hinged to the slip tooth.

3. The adjustable catheter according to claim 2, characterized in that A first inclined surface is provided on the side of the slip tooth away from the upper guide tube, and a second inclined surface is provided on the limit seat, and the first inclined surface abuts against the second inclined surface.

4. The adjustable catheter according to claim 1, characterized in that It also includes a hydraulic station and a hydraulic pipe. The hydraulic clamp and the sealing mechanism are connected to the hydraulic station through the hydraulic pipe. The hydraulic oil enters and exits the hydraulic cavity to selectively abut the sealing sleeve against the outer wall of the upper guide tube.

5. The adjustable catheter according to claim 4, characterized in that The sealing seat includes a main shell, a first fixing ring and a second fixing ring, the first fixing ring and the second fixing ring are respectively arranged at the upper and lower ends of the main shell, the upper end of the sealing sleeve is fixed between the first fixing ring and the main shell, and the lower end of the sealing sleeve is fixed between the second fixing ring and the main shell.

6. The adjustable catheter according to claim 5, characterized in that The hydraulic chamber is arranged between the main housing and the sealing sleeve, and the main housing is also provided with a through hole communicating with the hydraulic chamber.

7. The adjustable catheter according to claim 5, characterized in that A first sealing ring is provided between the first fixing ring and the main housing, and a second sealing ring is provided between the second fixing ring and the main housing.

8. The adjustable catheter according to claim 4, characterized in that A side of the sealing sleeve close to the upper conduit is wavy.

9. The adjustable catheter according to claim 1, characterized in that The hydraulic clamps are arranged at equal intervals around the outer wall of the upper conduit.

10. The adjustable catheter according to claim 1, wherein: A connecting rod is provided on both sides of each hydraulic clamp.

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