Gravity Press-in Anchoring Device for Deep Sea and Method for Laying Its Cross-Connecting Hose

Abstract

The present invention discloses a gravity-pressing type anchoring device for deep sea and a method for laying a jumper hose thereof. The gravity-pressing type anchoring device for deep sea includes a base part, a return control part and an anchoring part; the base part includes a mounting seat, a hydraulic vibrator, a buffer oil cylinder and a hook mechanism which are connected in sequence; the return control part includes an energy storage type hydraulic station which is hooked inside the hook mechanism, and a recovery pull rod which is slidably connected inside the energy storage type hydraulic station and penetrates up and down; the anchoring part includes an anchoring frame and a rocket-shaped anchor body; the method for laying the jumper hose is as follows: the above-mentioned gravity-pressing type anchoring device for deep sea is lifted to the moonpool bayonet by a crane and fixed to the bottom end of the riser string; one end of the jumper hose coiled on the platform trolley is connected to the jumper hose interface, and a connection box is installed on the mounting seat; drill pipes are connected one by one to the top end of the riser string until the anchoring device is sent to the seabed and anchored into the mud line; an underwater robot is used to connect the jumper hose to the suction module.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore drilling construction technology and solutions, and more specifically, to a gravity-pressed anchoring device for a deep-sea dual-gradient drilling system and a method for laying its jumper hoses. Background Art

[0002] The deep-sea dual-gradient drilling system is a solution for the recovery of drilling fluid in offshore drilling, which can effectively solve the problems of pollution caused by directly discharging drilling fluid into the sea and the large hull and doubled operating costs due to using risers to recover drilling fluid. In this technology, conventional risers are not used in offshore drilling, and the drill pipes are directly exposed to seawater. The subsea lift pump sends the drilling fluid containing cuttings in the wellhead suction module back to the drilling ship through the return pipe string.

[0003] As the return pipe string is the channel for the drilling fluid to return to the drilling ship, it needs to be positioned by an anchoring device on the seabed. The complex offshore drilling environment not only requires the device to provide firm positioning, but also to keep a certain distance from the wellhead to prevent collision with the wellhead suction module. At the same time, it also needs to have an emergency release ability to quickly disengage from the return pipe string in case of an emergency.

[0004] Generally, suction anchors or conical anchor barrels are used for the anchoring device. The processing and operation costs of suction anchors are relatively high, and the conical anchor barrels are prone to loosening during operation, resulting in low operation safety.

[0005] Therefore, how to provide a gravity-pressed anchoring device for a deep-sea dual-gradient drilling system and its jumper hose laying technology and solutions is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a gravity-pressed anchoring device for deep sea and a method for laying its jumper hoses, aiming to solve the above technical problems.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A gravity-pressed anchoring device for deep sea includes a base part, a return control part and an anchoring part;

[0009] The base part includes a mounting seat, a hydraulic vibrator, a buffer oil cylinder and a claw mechanism connected in sequence; the mounting seat has a jumper hose interface; the buffer piston rod of the buffer oil cylinder passes through the claw mechanism; the claw mechanism has an automatic release function;

[0010] The feedback control unit includes an energy storage hydraulic station that is hooked inside the claw mechanism. A recovery pull rod that penetrates up and down is slidably connected inside the energy storage hydraulic station. A buffer cable is wound around the top end of the recovery pull rod, and the free end of the buffer cable is fixedly connected to the bottom end of the buffer piston rod;

[0011] The anchoring part includes an anchoring frame and a rocket-shaped anchor body; the top end of the anchoring frame is detachably connected to the bottom end of the energy storage hydraulic station. A slider is slidably connected to the upper part of the anchoring frame, and the slider is detachably connected to the bottom end of the recovery pull rod. A U-shaped notch is formed in the lower part of the anchoring frame; the rocket-shaped anchor body is rotatably connected to the U-shaped notch through a pin shaft, the tip of the rocket-shaped anchor body faces downward, and a recovery cable is wound around the top end of the rocket-shaped anchor body, and the free end of the recovery cable is fixedly connected to the slider.

[0012] Through the above technical solutions, the present invention uses a rocket-shaped anchor body and a hydraulic vibrator, and can rely on gravity and hydraulic vibration to press the anchoring device into a predetermined distance below the seabed mud line; by controlling the energy storage hydraulic station, the rocket-shaped anchor body can be unlocked, the pipe string can be lifted and returned, driving the recovery cable, so that the anchor body changes the vertically pressed shape and increases the anchoring stability; when the present invention works, it can change the anchoring state through the recovery cable and increase the anchoring stability; in special cases, it can achieve emergency detachment without relying on an underwater robot.

[0013] Preferably, in the above-mentioned gravity-pressed anchoring device for deep sea, a connection box is installed on the mounting seat.

[0014] Preferably, in the above-mentioned gravity-pressed anchoring device for deep sea, a buffer cylinder control cabin is formed on the side wall of the buffer cylinder. The buffer cylinder control cabin can control the telescopic movement of the buffer piston rod to further adjust the buffer cable.

[0015] Preferably, in the above-mentioned gravity-pressed anchoring device for deep sea, a sonar control cabin is installed on the energy storage hydraulic station. The sonar control cabin is a signal transfer station, which can receive the deck sonar signal, send an action command to the energy storage hydraulic station, and at the same time feedback the state of the anchoring device to the deck. The energy storage hydraulic station can change the state of the anchoring device through hydraulic regulation according to the command transmitted by the sonar control cabin.

[0016] Preferably, in the above-mentioned gravity-pressed anchoring device for deep sea, the tip of the rocket-shaped anchor body is filled with lead for weighting. The recovery pull rod and the recovery cable can be linked to drive the rocket-shaped anchor body to rotate a certain angle around the pin shaft.

[0017] Preferably, in the above-mentioned gravity-pressurized anchoring device for deep sea, the hook mechanism is a toggle hook structure controlled by a hydraulic cylinder structure. After the anchoring device enters the anchoring state, the release of the toggle hook structure controlled by the hydraulic cylinder structure can control the opening of the hook, and the buffer cylinder and the recovery pull rod are pulled apart by a certain distance, playing a role in heave compensation.

[0018] Preferably, in the above-mentioned gravity-pressurized anchoring device for deep sea, between the top end of the anchoring frame and the bottom end of the energy storage hydraulic station, and between the slider and the bottom end of the recovery pull rod, a hydraulic clamping mechanism is used for connection, and the hydraulic clamping mechanism is a telescopic locking pin structure controlled by a hydraulic cylinder structure. The telescopic locking pin structure controlled by the hydraulic cylinder structure has the characteristics of stable structure and simple control.

[0019] The present invention also provides a method for laying a jumper hose for deep sea, including the following steps:

[0020] S1. Use a crane to lift the above-mentioned gravity-pressurized anchoring device for deep sea to the moonpool bayonet and fix it to the bottom end of the riser string;

[0021] S2. Connect one end of the jumper hose coiled on the platform trolley to the jumper hose interface, and install a patch panel on the mounting seat;

[0022] S3. Connect drill pipes one by one to the top end of the riser string until the anchoring device is sent to the seabed and anchored into the mud line;

[0023] S4. Use an underwater robot to connect the jumper hose to the suction module.

[0024] Through the above technical solutions, the method for laying a jumper hose provided by the present invention can stably and efficiently lay the jumper hose required for the anchoring device, which is more convenient to operate than the conventional process and scheme, and has a positive promoting effect on the offshore drilling industry.

[0025] Preferably, in the above-mentioned method for laying a jumper hose for deep sea, in step S2, the side wall of the bottom end of the riser string has a fixed cable clamp. After one end of the jumper hose is connected to the jumper hose interface, the fixed cable clamp is connected to the jumper hose; after the jumper hose is led out by the platform trolley, it is lifted by a fixed pulley hook to realize the guiding and lowering action of the jumper hose. Connecting the jumper hose to the fixed cable clamp can reduce the connection tension between the jumper hose and the jumper hose interface and prevent the connection point from loosening; lifting the jumper hose by the fixed pulley hook can prevent the jumper hose from rubbing and damaging the deck.

[0026] Preferably, in the above-described method for deploying a jumper hose for deep sea, buoyancy balls are installed at equal intervals on the jumper hose. Since the jumper hose is relatively heavy, the buoyancy balls can assist the operation of the underwater robot, reduce the weight, and improve the operation efficiency.

[0027] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a gravity-pressurized anchoring device for deep sea and its method for deploying a jumper hose, which has the following beneficial effects:

[0028] 1. It has better stability. With the help of gravity and hydraulic vibration, after the rocket-shaped anchor body is pressed into the seabed mud line to a predetermined depth, it tilts, which can increase the anchoring stability.

[0029] 2. It can be lowered to the seabed together with the upper return pipe string, and the operation is simple.

[0030] 3. The cost is lower than other solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0032] Figure 1 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is pressed during normal anchoring use;

[0033] Figure 2 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is anchored during normal anchoring use;

[0034] Figure 3 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is compensated during normal anchoring use;

[0035] Figure 4 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is unlocked during normal anchoring use;

[0036] Figure 5 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is recovered during normal anchoring use;

[0037] Figure 6 The drawings are schematic diagrams of the structure of the gravity-pressurized anchoring device for deep sea provided by the present invention when it is in an emergency disengagement;

[0038] Figure 7 The attached drawing is Figure 6 an enlarged view of the partial area A in

[0039] Figure 8 The attached drawing is Figure 6 an enlarged view of the partial area B in

[0040] Figure 9 a schematic diagram of steps S1 and S2 of the method for laying jumper hoses for deep sea provided by the present invention;

[0041] Figure 10 a schematic diagram of steps S3 and S4 of the method for laying jumper hoses for deep sea provided by the present invention.

[0042] Wherein:

[0043] 1 - Base part;

[0044] 11 - Mounting seat; 111 - Jumper hose interface; 12 - Hydraulic vibrator; 13 - Buffer oil cylinder; 131 - Buffer piston rod; 14 - Hook mechanism; 15 - Patch panel; 16 - Buffer oil cylinder control cabin;

[0045] 2 - Return control part;

[0046] 21 - Energy storage type hydraulic station; 22 - Recovery pull rod; 23 - Buffer cable; 24 - Sonar control cabin;

[0047] 3 - Anchoring part;

[0048] 31 - Anchoring frame; 32 - Rocket - shaped anchor body; 33 - Slide block; 34 - Pin shaft; 35 - Recovery cable; 36 - Hydraulic clamping mechanism;

[0049] 4 - Up - return pipe string;

[0050] 41 - Fixed cable clamp;

[0051] 5 - Platform trolley;

[0052] 6 - Jumper hose;

[0053] 61 - Buoyancy ball;

[0054] 7 - Drill pipe;

[0055] 8 - Suction module;

[0056] 9 - Fixed pulley hook. Specific implementation mode

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0058] Embodiment 1:

[0059] See the attached Figure 1 to the attached Figure 3 , the embodiments of the present invention disclose a gravity press-in type anchoring device for deep sea, including a base part 1, a return control part 2 and an anchoring part 3;

[0060] The base part 1 includes a mounting seat 11, a hydraulic vibrator 12, a buffer oil cylinder 13 and a claw mechanism 14 connected in sequence; a cross-connecting hose interface 111 is provided on the mounting seat 11; the buffer piston rod 131 of the buffer oil cylinder 13 passes through the claw mechanism 14; the claw mechanism 14 has an automatic release function;

[0061] The return control part 2 includes an energy storage type hydraulic station 21 hooked inside the claw mechanism 14. A recovery pull rod 22 that penetrates up and down is slidably connected inside the energy storage type hydraulic station 21. A buffer cable 23 is wound around the top end of the recovery pull rod 22. The free end of the buffer cable 23 is fixedly connected to the bottom end of the buffer piston rod 131;

[0062] The anchoring part 3 includes an anchoring frame 31 and a rocket-shaped anchor body 32; the top end of the anchoring frame 31 is detachably connected to the bottom end of the energy storage type hydraulic station 21. A slider 33 is slidably connected to the upper part of the anchoring frame 31. The slider 33 is detachably connected to the bottom end of the recovery pull rod 22. A U-shaped notch is formed in the lower part of the anchoring frame 31; the rocket-shaped anchor body 32 is rotatably connected to the U-shaped notch through a pin shaft 34. The tip of the rocket-shaped anchor body 32 faces downward. A recovery cable 35 is wound around the top end of the rocket-shaped anchor body 32. The free end of the recovery cable 35 is fixedly connected to the slider 33.

[0063] To further optimize the above technical solution, a connection box 15 is installed on the mounting seat 11.

[0064] To further optimize the above technical solution, a buffer oil cylinder control cabin 16 is formed on the side wall of the buffer oil cylinder 13.

[0065] To further optimize the above technical solution, a sonar control cabin 24 is installed on the energy storage type hydraulic station 21.

[0066] To further optimize the above technical solution, the tip of the rocket-shaped anchor body 32 is lead-weighted.

[0067] To further optimize the above technical solution, the claw mechanism 14 is a telescopic claw structure controlled by a hydraulic cylinder structure. AsFigure 3 As shown, the hook mechanism 14 is a structure in which a hinged hook driven by a hydraulic cylinder performs opening and closing actions.

[0068] In order to further optimize the above technical solution, the top of the anchor frame 31 and the bottom of the energy storage hydraulic station 21, as well as the slider 33 and the bottom of the recovery rod 22 are connected by a hydraulic clamping mechanism 36, which is a telescopic locking pin structure controlled by a hydraulic cylinder structure. Figures 6 to 8 As shown, the hydraulic clamping mechanism 36 is a locking pin type plug-in structure controlled by a hydraulic cylinder. When the hydraulic cylinder is extended, the clamping is fixed, and when the hydraulic cylinder is retracted, the lock is unlocked and released.

[0069] The anchoring device provided in this embodiment includes a normal anchoring method and an emergency detachment method in an emergency state, specifically:

[0070] The normal anchoring method of the anchoring device is:

[0071] ① Press-in: Use the lead weight at the front end of the rocket anchor body 32 and the hydraulic vibrator 12 to perform press-in anchoring, such as Figure 1 As shown;

[0072] ② Anchoring: After sinking into the mud line, the upper return pipe string 4 is lifted up, and the recovery cable 35 is released, so that the rocket-shaped anchor body 32 is tilted and anchored. Figure 2 Status shown;

[0073] ③ Compensation: The opening and closing hook structure controlled by the release hydraulic cylinder structure can control the hook to open, the buffer cylinder 13 and the recovery rod 22 are pulled apart by a certain distance, and the buffer cable 23 is released to play a role in heave compensation, such as Figure 3 As shown;

[0074] ④ Unlocking: During recovery, the deck sonar controls the energy storage hydraulic station 21 to unlock the limit cylinder of the recovery rod 22, lift the upper return pipe string 4, move the recovery rod 22 upward, straighten the recovery cable 35, and straighten the rocket-shaped anchor body 32. Figure 4 Status shown;

[0075] ⑤ Recovery: Lift up the return pipe string 4 and pull out the rocket-shaped anchor body 32. Figure 5 Status shown.

[0076] The emergency release method of the anchoring device is:

[0077] When the anchor device cannot be pulled out, the deck sonar controls the energy storage hydraulic station 21 to unlock the two hydraulic clamping mechanisms 36 and abandon the anchoring part 3. Figure 6 shown.

[0078] Embodiment 2:

[0079] See attachedFigure 9 and appendix Figure 10 An embodiment of the present invention discloses a method for laying a jumper hose for deep sea, including the following steps:

[0080] S1. Use a crane to lift a gravity-pressurized anchoring device for deep sea in Embodiment 1 to the moonpool bayonet and fix it to the bottom end of the riser string 4;

[0081] S2. Connect one end of the jumper hose 6 coiled on the platform trolley 5 to the jumper hose interface 111. The jumper hose includes an underwater jumper cable and a hose quick connection; install a patch panel 15 on the mounting seat 11, connect the patch panel 15 to the auxiliary cable, perform co-power debugging, and at the same time check the oil quantity and pressure of the pressure compensator. The patch panel 15 is respectively connected to the hydraulic station of the anchoring device and the underwater jumper cable;

[0082] S3. Connect drill pipes 7 one by one to the top end of the riser string 4 until the anchoring device is sent to the seabed and anchored below the mud line; use an underwater robot for underwater auxiliary operations to observe whether the rocket-shaped anchor body 32 of the anchoring device is pressed below the mud line. The auxiliary cable communicates to control the hydraulic system of the seabed anchoring equipment. The anchoring device is anchored below the mud line, control the hydraulic cylinder to act, release the rocket-shaped anchor body 32 and open the claw mechanism 14, lift the riser string 4 to 10 m above the mud line, and turn on the heave compensation function;

[0083] S4. Use an underwater robot to connect the jumper hose 6 to the suction module 8; connect communication and power supply to the suction module 8, and perform communication, electrical inspection and monitoring debugging of the entire underwater system.

[0084] In step S2, the side wall of the bottom end of the riser string 4 has a fixed cable clip 41. After one end of the jumper hose 6 is connected to the jumper hose interface 111, connect the fixed cable clip 41 to the jumper hose 6; after the jumper hose 6 is led out by the platform trolley 5, it is lifted by a fixed pulley hook 9 to realize the guiding and lowering action of the jumper hose 6.

[0085] In step S3, buoyancy balls 61 are installed at equal intervals on the jumper hose 6. In this embodiment, buoyancy balls 61 are installed at equal intervals for 50 m.

[0086] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is the difference from other embodiments. The same and similar parts between each embodiment can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0087] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gravity press-in type anchoring device for deep sea, characterized in that, it comprises a base part (1), a return control part (2) and an anchoring part (3); The base part (1) comprises a mounting seat (11), a hydraulic vibrator (12), a buffer oil cylinder (13) and a claw mechanism (14) connected in sequence; a cross-connecting hose interface (111) is provided on the mounting seat (11); the buffer piston rod (131) of the buffer oil cylinder (13) passes through the claw mechanism (14); the claw mechanism (14) has an automatic release function; The return control part (2) comprises an energy storage type hydraulic station (21) hooked inside the claw mechanism (14), a recovery pull rod (22) that is slidably connected inside the energy storage type hydraulic station (21) and penetrates up and down, a buffer cable (23) is wound around the top end of the recovery pull rod (22), and the free end of the buffer cable (23) is fixedly connected to the bottom end of the buffer piston rod (131); The anchoring part (3) comprises an anchoring frame (31) and a rocket-shaped anchor body (32); the top end of the anchoring frame (31) is detachably connected to the bottom end of the energy storage type hydraulic station (21), a slider (33) is slidably connected to the upper part of the anchoring frame (31), the slider (33) is detachably connected to the bottom end of the recovery pull rod (22), and a U-shaped notch is formed in the lower part of the anchoring frame (31); the rocket-shaped anchor body (32) is rotatably connected to the U-shaped notch through a pin shaft (34), the tip of the rocket-shaped anchor body (32) faces downward, a recovery cable (35) is wound around the top end of the rocket-shaped anchor body (32), and the free end of the recovery cable (35) is fixedly connected to the slider (33); A connection box (15) is installed on the mounting seat (11); A buffer oil cylinder control cabin (16) is formed on the side wall of the buffer oil cylinder (13).

2. The gravity press-in type anchoring device for deep sea according to claim 1, characterized in that, a sonar control cabin (24) is installed on the energy storage type hydraulic station (21).

3. The gravity press-in type anchoring device for deep sea according to claim 1, characterized in that, the tip of the rocket-shaped anchor body (32) is lead-weighted.

4. The gravity press-in type anchoring device for deep sea according to claim 1, characterized in that, the claw mechanism (14) is a telescopic claw structure controlled by a hydraulic cylinder structure.

5. The gravity press-in type anchoring device for deep sea according to claim 1, characterized in that, between the top end of the anchoring frame (31) and the bottom end of the energy storage type hydraulic station (21), and between the slider (33) and the bottom end of the recovery pull rod (22), a hydraulic clamping mechanism (36) is used for connection, and the hydraulic clamping mechanism (36) is a telescopic locking pin structure controlled by a hydraulic cylinder structure.

6. A method for laying cross-connecting hoses for deep sea, characterized in that, it comprises the following steps: S1. Lift the gravity press-in type anchoring device for deep sea according to any one of claims 1-5 to the moon pool bayonet by a crane and fix it to the bottom end of the up-return pipe string (4); S2. Connect one end of the jumper hose (6) coiled on the platform trolley (5) to the jumper hose interface (111), and install a connection box (15) on the mounting base (11); S3. Connect drill pipes (7) one by one to the top of the upward-return pipe string (4) until the anchoring device is sent to the seabed and anchored into the mud line; S4. Use an underwater robot to connect the jumper hose (6) to the suction module (8).

7. A method for laying a jumper hose for deep sea according to claim 6, wherein, in step S2, the bottom side wall of the upward-return pipe string (4) is provided with a fixed cable clamp (41). After one end of the jumper hose (6) is connected to the jumper hose interface (111), connect the fixed cable clamp (41) to the jumper hose (6); after the jumper hose (6) is led out by the platform trolley (5), it is lifted by a fixed pulley hook (9) to realize the guiding and lowering action of the jumper hose (6).

8. A method for laying a jumper hose for deep sea according to claim 6, wherein, in step S3, buoyancy balls (61) are installed on the jumper hose (6) at equal intervals.

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