KR20140135335A - Method of vertical lifting type for waste pipe line retrieval - Google Patents

Abstract

The present invention provides a vertical lifting type waste pipeline collection method. According to an aspect of the present invention, the vertical lifting type waste pipeline collection method comprises: a first step of putting a remained oil collection unit and an ROV into water from a ship having a lifting device, and dividing a waste pipeline into individual pipes using the ROV; a second step of putting a guide line and a fixing block from the ship to a seabed to install the guide line between the seabed around the one individual pipe and the ship; a third step of installing chain clamps in the individual pipe using the ROV; a fourth step of connecting a lifting plug to the individual pipe using the ROV; a fifth step of ascending the lifting plug and a lifting cable using the lifting device to erect the individual pipe; a sixth step of connecting the chain of the chain clamps to the guide line using the ROV; and a seventh step of ascending the lifting cable, the lifting plug, and the erected individual pipe toward the ship using the lifting device to collect the individual pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to a vertical lifting type pipeline recycling method,

The present invention relates to a vertical lifting type waste pipeline recovery method for lifting and lifting individual pipes so as to separate the waste pipeline left in the deep sea into individual pipes and to minimize frictional resistance with seawater during lifting.

Pipelines are installed on the seafloor to facilitate transport of fluid, such as crude oil or gas drilled in the sea, to storage tanks or treatment facilities installed at remote locations.

Such pipelines serve to transport crude oil or gas produced at offshore plants to marine or land storage areas.

On the other hand, when the production of crude oil in the oil well is ended, the operation of the pipeline is also stopped and becomes a waste pipeline.

At this time, the waste pipeline whose operation has been suspended is in principle withdrawn, but it is left on the grounds of the difficulty of regulatory inadequacy and recovery work and cost incurrence.

In addition, since the existing pipelines located at the sea floor have a length of several hundred meters to several kilometers, it is very difficult to reliably lift and balance the load of individual pipes even if they are partially cut and lifted into individual pipes. There is a high possibility that problems such as tilting of the pipes and tangling of the lifting cables are likely to occur.

That is, since the waste pipeline is cut into individual pipes and the individual pipes are horizontally positioned between the sea surface and the sea floor, that is, the deep water deep in the deep sea, The individual pipes can not be lifted quickly due to the flow friction of the seawater during the lifting of the pipe, or a plurality of lifting cables connected to the individual pipes in the horizontal state may be twisted.

US Patent 6,292,431

The present application is directed to solve the above-mentioned problems. The present application aims at minimizing the underwater friction resistance of the individual pipes being lifted by cutting and separating the waste pipelines located at the seabed into individual pipes and lifting them up vertically It is a problem to provide a vertical lifting type waste pipeline recovery method capable of quickly recovering individual pipes.

The problems of the present application are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an apparatus for separating a waste pipeline into individual pipes by introducing a remaining oil recovery unit and an ROV into water in a ship having a lifting device, Stage 1; A second step of inserting a guide line and a fixed block from the ship into a sea bed side to install a guide line between the sea floor around the individual pipe and the ship; A third step of installing a chain clamp on an individual pipe by the ROV; Connecting a lifting plug to the individual pipe by the ROV; A fifth step of raising the lifting plug and the lifting cable by the lifting device to stand the individual pipes; A sixth step of connecting the chain of the chain clamp to the guide line by the ROV; And a seventh step of raising the lifting cable, the lifting plug and the standing individual pipe to the ship by the lifting device to recover the individual pipe, can be provided .

In the first step, the remaining oil collecting unit punctures the pipe wall of the waste pipeline and inserts the suction pipe through the perforated hole to suck the remaining oil in the waste pipeline .

In the second step, the block winch portion of the lifting device descends the guide line and the fixed block toward the undersurface of the periphery of the individual pipe, and as the first winch portion applies the tension to the guide line , And a process in which the guide line is in a straight line state.

Between the third step and the fourth step, the lifting device descends the lifting cable of the crane part to lower the lifting plug toward the working space between the cutting face of the closed pipeline and the end of the individual pipe .

Further, in the sixth step, in a state in which the ROV catches the shackle provided at the end of the chain of the chain clamp so that the standing state of the individual pipe during the lifting can be guided by the guide line, After the ROV moves along the perimeter of the line, connecting the shackle to the chain clamp and connecting the chain to the guide line in the form of a ring may be included.

According to the waste pipeline recovery method of the vertical lifting method of the present application, the following effects can be obtained.

First, a guide line is installed between the deep sea pipeline recovery vessel and the sea floor, and the individual pipes in a horizontal state are erected so as to correspond to the extending direction of the guide line, that is, the vertical direction, By pulling up the individual pipes, the resistances due to underwater flow friction are relatively reduced when the individual pipes are lifted in a vertical state than when the individual pipes are lifted in a horizontal state, the swinging of the individual pipes is relatively minimized and the lifting time is shortened It can be economically salvaged.

Second, by connecting the lifting plug to the end of the individual pipe and raising the lifting cable connected to the lifting plug, it is possible to solve the problem that a plurality of lifting cables are twisted when lifting the individual pipes in a horizontal state.

The effects of the present application are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a flowchart illustrating a method for recovering a waste pipeline in a vertical lifting type according to an embodiment of the present invention,
Fig. 2 is a front view of the lifting plug shown in Fig. 1 before engagement with an individual pipe,
Fig. 3 is a sectional view of the lifting plug shown in Fig. 1 after being fastened to an individual pipe,
Fig. 4 is a perspective view of the chain clamp shown in Fig. 1,
FIG. 5 is a schematic view for explaining the first step of FIG. 1,
FIG. 6 is a schematic view for explaining the second step of FIG. 1,
7 is a schematic view for explaining the third step of FIG. 1,
FIG. 8 is a schematic view for explaining the fourth step of FIG. 1,
FIG. 9 is a schematic view for explaining the fifth step of FIG. 1,
10 is a schematic view for explaining the sixth step of FIG. 1,
11 is a schematic view for explaining the seventh step of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

1 is a flowchart illustrating a method for recovering a waste pipeline in a vertical lifting type according to an embodiment of the present invention.

Referring to FIG. 1, a vertical lifting type waste pipeline recovery method according to an embodiment of the present application includes a lifting device having a crane and a block winch, a remaining oil recovery unit, a remotely-operated vehicle (ROV) The first step (S10) to the seventh step (S70) may be performed using a ship having a clamp, a lifting cable, a lifting plug, and the like.

Fig. 2 is a front view of the lifting plug shown in Fig. 1 before fastening with an individual pipe, Fig. 3 is a cross-sectional view of the lifting plug shown in Fig. 1 after fastening with individual pipes, Fig. 5 is a schematic view for explaining the first step of Fig. 1. Fig. 5 is a perspective view of the chain clamp shown in Fig.

Referring to FIGS. 1 and 5, the first step S10 is to put the residual oil recovery unit 300 and the ROV 400 into the water in the ship 100 having the lifting device 200, To separate the waste pipeline 1 into individual pipes 10 by means of a separate pipe.

As a preceding step of the first step S10, the ship 100 moves to the working area where the deep-water waste pipeline 1 exists, that is, to the waste pipeline site B, (S) positioned at the vertical upper portion of the sea surface (B).

The vessel 100 may be a subsea pipeline retrieval vessel (SPRV).

Since the method of mooring the ship 100 to the sea surface S can be performed by a method used in a general marine vessel, detailed description of the mooring method can be omitted here.

The ship 100 is equipped with at least one, for example, one ROV 100 in its hull and can be introduced into the water. The ship 100 is connected to the upper deck of the ship 100 by a separate pipe (110) in which the pipe (10) can be loaded.

The ship 100 may further have a remaining oil recovery unit 300 connected to a support facility 310 having a winch function, a remaining oil recovery function, and a storage function. Here, the remaining oil recovery unit 300 may be connected to the waste pipeline 1 to perform the function of recovering residual oil in the interior of the waste pipeline 1.

For example, although the remaining oil recovery unit 300 is not shown, the drill module and the suction module are provided inside the unit body. In the course of the first step S10, 1, the suction pipe of the suction module is inserted through the perforated hole to suck the remaining oil in the inside of the waste pipeline 1, and the sucked remaining oil is sucked into the suction line 301, To the storage tank (not shown) of the support facility 310 through the storage tank (not shown).

That is, in the first step S10, the remaining oil recovery unit 300 punctures the pipe wall of the waste pipeline 1, inserts the suction pipe through the perforated hole, 1 and the suctioned residual oil is recovered to the storage tank (not shown) of the support facility 310 via the suction line 301. [0050]

The lifting device 200 is provided with a crane 210 capable of descending the lifting cable 211 to the bottom of the deep sea, And a block winch portion 220 capable of lowering the line 221.

The lifting cable 211 of the crane unit 210 is connected to the lug portion 252 of the lifting plug 250 to provide a first cable 211a for generating a substantial lifting force, A second cable 211b for pulling the rod 253 to generate a fastening force, and the like.

That is, the end of the first cable 211a of the lifting cable 211 may be connected to the lug portion 252 of the lifting plug 250 described with reference to FIG. 2 and FIG. Also, the second cable 211b of the lifting cable 211 may be connected to the upper end of the operating rod 253 of the lifting plug 250.

Meanwhile, a fixing block 222 is connected to an end of the guide line 221 of the block winch 220. Here, the fixed block 222 may be a concrete block or tetrapod having a certain weight, and the guide line 221 may be held tight or the guide line 221 may be maintained in a straight line. And therefore it may not be limited to the concrete block or the tetra port alone.

The guide line 221 is formed in the vicinity of the periphery of the block winch 220 in consideration of the condition that the individual pipe 10 stands upright, that is, the condition that the individual pipe 10, which was horizontal on the sea floor, And may extend through the top of the lifting tower 223 to the water.

The ship 100 may be moved to a separate trolley unit other than the crane unit 210 such as a heavy load water horizontal moving Device) (not shown).

The ship 100 also includes an ROV connection line 401 for supplying various sources (e.g., power source, communication signal, hydraulic pressure, etc.) to the ROV 400, And ROV support means 402 in the form of a hoist. Here, although the ROV 400 is provided as one unit, a plurality of ROVs 400 may be provided to maximize the operation efficiency to support individual pipe recovery operations.

ROV 400 may include units 500 and 600 and chain clamp 450 to realize individual pipe cutting, fastening or disassembly of various bolts, or shackle fastening or detaching functions.

Basically, the ROV 400 includes a frame in which a levitation or position control device is installed, a plurality of robotic arms installed in the frame, that is, a manipulator, and a unit 500, which corresponds to an end effector of the manipulator, 600).

That is, the units 500 and 600 may include the cutting unit 500 and the operation unit 600.

The cutting unit 500 may be an underwater working plasma cutter or an underwater work equipment (e.g., a laser cutter) in which cutting and melting are simultaneously performed, or a pipe cutter such as a wire saw.

The operation unit 600 can perform a function of holding or rotating an object with a tool or a clamp that can tighten or loosen the bolt. The operation unit 600 includes a tool that can tighten or loosen the bolt of the chain clamp, A gripper for gripping or releasing the gripper, and a rotating device for rotating the gripper to adjust the position or angle of the gripper.

The shackle has a shackle body for deep-sea work and a shackle pin to be fitted to the shackle body. In order to facilitate the fastening between the shackle body and the shackle pin, an elastic step is formed on the shackle pin. And may be a general connecting means configured to be held in a state of being inserted by the elastic step after being inserted into the hole or the like.

Of course, the manipulator of the ROV 400 may control the angle of the joint of the manipulator or the rotational motion of the manipulator.

2 and 3 and 5, the lifting plug 250 includes a plug body 251 having a diameter larger than the inner diameter of the individual pipe 10 and a lifting cable 251 projecting on the upper surface of the plug body 251, And an operating rod 253 passing through the center hole of the plug body 251 in the vertical direction and having a wedge end 253a at the lower end thereof.

The lifting plug 250 may include a plurality of resilient fixing pieces 254 disposed below the plug body 251 and spaced apart around the operating rod 253 along the circumferential direction of the operating rod 253 have. The upper end of each resilient fixing piece 254 is connected by a fastening bolt 255 on the basis of the plug body 251. The lower end of the elastic fastening piece 254 opposite to the fastening bolt 255 is elastically deformed, That is, from the state of FIG. 2 to the state of FIG. 3 or to the opposite state.

Since the wedge surface 254a having a slippery relationship with the wedge end portion 253a of the operating rod 253 is formed on the inner surface of the elastic fixing piece 254, When the operation rod 253 is moved upward (F), a fastening operation R may be generated in which the lower ends of the respective elastic fastening pieces 254 are unfolded in the outward direction.

The ROV 400 described above holds the lifting plug 250 in the state before the lower end of the resilient fixing piece 254 is unfolded (see FIG. 2) The resilient fixing pieces 254 of the lifting plug 250 are inserted.

Thereafter, when the second cable 211b of the lifting cable 211 of the ship 100 is pulled more than the first cable 211a, the lug portion 252 connected to the first cable 211a and the plug body 251 Is in the unmoving state, but only the actuating rod 253 connected to the second cable 211b can be moved upward.

The upward movement force of the operation rod 253 is transmitted to the lower end of the elastic fixing piece 254 by the sliding treatment between the wedge end 253a of the actuating rod 253 and the wedge surface 254a of the elastic fixing piece 254 And can be converted into a fastening force for fastening operation (R) that spreads in the outward direction.

Whereby the outer surface of the elastic fixing piece 254 is brought into close contact with the inner peripheral surface of the individual pipe 10 so that the lifting plug 250 and the individual pipe 10 can be fixed and connected to each other.

4 and 5, the chain clamp 450 includes a semicircular tube-shaped upper portion 451 which can cover the outer diameter of the individual pipe 10, A clamp bolt 453 coupled to the flange of the upper portion 451 and the lower portion 452 and a clamp bolt 453 coupled to the flange of the upper portion 451 and the lower portion 452, A pair of hooks 455 and 457 hinged to an end of the chain connecting portion 454 and a chain 456 connected to the one hook portion 455 and a chain 456 connected to the chain 455, And a shackle 458 which is connected to the other end and can be attached to the other ring portion 457. Here, the chain 456 may have a length enough to loosen the circumference of the guide line 221 and then return to the other side ring 457 again.

The clamp bolt 453 is partially loosened so that the clamp bolt 453 can be smoothly inserted into the individual pipe 10 before the use of the chain clamp 450. The lower half 452 and the lower half 452 of the half- .

The ROV 400 is assembled by inserting the chain clamp 450 in the pre-use state into the individual pipe 10 by using the operation unit 600 in the form of both robot arms and tightly tightening the clamp bolt 453, 10 and the lower portion 452 of the semicircular tube shape located at the upper and lower sides of the upper and lower portions of the pipe clamp 10 and the lower pipe 452 so that the chain clamp 450 and the individual pipes 10 can be fixed and connected to each other.

Referring to FIGS. 1 and 5, in a first step S10, the waste pipeline 1 can be separated into individual pipes 10 by the ROV 400, The cutting unit 500 is moved corresponding to the plurality of pipe cutting positions P1 and P2 so that the waste pipeline 1 can be cut and separated into individual pipes 10 as a result.

The ROV 400 performs the operation control (e.g., angle control) of the manipulator for the cutting unit 500 and as a result the cutting unit 500 is moved to the pipe cutting positions P1 and P2 of the closed pipeline 1 .

The manipulator of the ROV 400 performs operations corresponding to the posture required by the cutting unit 500, which is a pipe cutter such as a plasma cutter or a wire saw for underwater work, (10) can be cut and separated.

For example, a case where the cutting unit 500 is a plasma cutter will be exemplarily described. In the cutting unit 500 moved by the manipulator of the ROV 400, the plasma heat for cutting is applied to one pipe A process in which the ROV 400 is moved by the distance between the pipe cutting positions P1 and P2 and stops after the plasma thermal spraying of the cutting unit 500 is stopped; The individual pipe 10 can eventually be cut off and separated from the waste pipeline 1 by a process of re-injecting the cutting plasma heat toward the pipe cutting position P2 on the other side of the pipe 1.

6 is a schematic view for explaining the second step of FIG.

Referring to FIGS. 1 and 6, the second step S20 is to insert the guide line 221 and the fixed block 222 from the ship 100 into the sea floor, And a guide line 221 may be installed between the ships 100.

In particular, in the second step S20, the fixing block 222 is mounted on the sea surface S (FIG. 2) outside the ship 100 by using a separate crane cable and a lifting device 213 provided on the crane portion 210 of the lifting device 200, ).

The block winch part 220 of the lifting device 200 releases the guide line 221 so that the guide line 221 and the fixed block 222 are moved to the underside of the periphery of the individual pipe 10 .

The lowered fixed block 222 is seated on the undersurface of the waste pipeline site B, and the guide line 221 connected to the fixed block 222 may be in a loose state at this time.

The first winch part 220 of the lifting device 200 may have a load sensing sensing device (not shown) for monitoring the tension of the guide line 221. The controller of the winch unit 220 winds the guide line 221 by an amount instructed by the load sensing apparatus so that the first winch unit 220 keeps the guide line 221 in a loose state. The tension of the guide line 221 is maintained and the drum stopper (not shown) of the winch unit 220 is operated to maintain the stop state of the drum for the guide line 221, Can be straightened linearly.

The ROV 400 also has an end of the individual pipe 10 by the length of the lifting plug 250 in order to secure a work space M that can connect the lifting plug 250 to the end of the individual pipe 10 The site can be further cut. As another method for securing the work space M, the ROV 400 pushes the individual pipe 10 while holding the end portion of the individual pipe 10 with the operation unit 600, So as to generate an impelling force in the ROV 400 sufficient to generate an angle twisted with respect to the direction of extension of the pipe 1 so that the individual pipe 10 is twisted relative to the waste pipeline 1 So that the work space M can be secured between the cut surface of the waste pipeline 1 and the end of the individual pipe 10. [

7 is a schematic view for explaining the third step of FIG.

Referring to FIGS. 1 and 7, the third step S30 may be a step of installing the chain clamps 450 and 450a on the individual pipes 10 by the ROV 400. Here, the chain clamps 450 and 450a may be installed at two locations, such as one end and the other end of the individual pipe 10, respectively.

The bottom surface of the waste pipeline site B on which the individual pipes 10 are placed may have voids in which the chain clamps 450 and 450a can be inserted between the individual pipes 10 and the bottom surface due to mud etc. have.

For example, when the chain clamp 450 on the left side of the chain clamps 450 and 450a is used as a reference, the ROV 400 grasps the chain clamp 450 by using the operation units 600 in the form of robot arms, And moves the chain clamp 450 toward the individual pipe 10 side. At this time, since the clamp bolt 453 (see Fig. 4) is loosely tightened, the insertion hole C of the chain clamp 450 can be formed to be larger than the outer diameter of the individual pipe 10, 450 can be inserted into the individual pipes 10, and the process of completely tightening the clamp bolt 453 with the operation unit 600 can be repeated.

As a result, the semi-circular tubular lower portion 452 and the lower portion 452 located above and below the individual pipe 10 are brought into close contact with each other so that the chain clamp 450 and the individual pipe 10 are fixed and connected to each other .

Between the third step S30 and the following fourth step S40, the lifting device 200 descends the lifting cable 211 of the crane section 210 to lift the lifting plug 250 from the waste pipeline 210. [ (M) between the cut surface of the pipe (1) and the end of the individual pipe (10).

FIG. 8 is a schematic diagram for explaining the fourth step of FIG. 1; FIG.

Referring to FIGS. 1 and 8, the fourth step S40 may be a step of connecting the lifting plug 250 to the individual pipe 10 by the ROV 400.

That is, the ROV 400 holds the lowered lifting plug 250 by the operation unit 600 and moves toward the hole of the end of the individual pipe 10. At this time, the crane portion 210 of the lifting device 200 can loosely release the lifting cable 211 so that the lifting plug 250 can freely move.

The ROV 400 inserts the lifting plug 250 into the hole of the end of the individual pipe 10 corresponding to the insertion operation proceeding in the manipulator and operation unit 600 thereof. Here, the lifting plug 250 before the insertion may be in the state shown in FIG. 2 described above. The insertion operation proceeding in the operation unit 600 is a process in which the operation unit 600 moves while holding the lifting plug 250 to align the center of the lifting plug 250 with the center of the hole at the end of the individual pipe 10, May be a series of operations for inserting the lifting plug 250 into the opening 250. [

The crane portion 210 of the lifting device 200 is pivoted to the second position of the lifting cable 211 when the resilient fixing piece 254 of the lifting plug 250 is fully inserted into the hole of the end of the individual pipe 10 Pull only the cable 211b.

3, the lifting plug 250 and the individual pipe 10 can be in a fixed or fixed state with respect to each other.

FIG. 9 is a schematic view for explaining the fifth step of FIG. 1; FIG.

1 and 9, in a fifth step S50, the lifting plug 250 and the lifting cable 211 are lifted by the lifting device 200 so that the individual pipe 10 stands upright on the underside .

At this time, the crane unit 210 of the lifting device 200 also pulls up the first cable 211a of the lifting cable 211. At this time, at least the tension of the second cable 211b is lower than the tension of the first cable 211a So that the state where the lifting plug 250 and the individual pipe 10 are fixed to each other can be maintained.

By adjusting the position of the crane portion 210 of the lifting device 200, the individual pipe 10 is brought close to the guide line 221.

10 is a schematic view for explaining the sixth step of FIG.

Referring to FIGS. 1 and 10, the sixth step S60 may be a process of connecting the chain 456 of the chain clamp 450 to the guide line 221 by the ROV 400.

That is, in the sixth step S60, when the ROV 400 is installed on the chain clamps 450 and 450a so that the standing state of the individual pipe 10 can be guided by the guide line 221 during lifting, The ROV 400 moves along the circumference of the guide line 221 while the shackle 458 provided at the end of the chains 456 and 456a of the shackle 458 may be connected to the chain clamps 450 and 450a and the chains 456 and 456a may be connected to the guide lines 221 in the form of a ring.

In other words, the ROV 400 can wind the chain 456 and 456a around the guide line 221, respectively, while holding the corresponding shackle 458 of the chain 456 and 456a to the operation unit 600 . Thereafter, the operation of the operation unit 600 can be performed so that the shackle 458 can be connected to the other side ring 457 (see Fig. 4) of the chain clamps 450 and 450a, respectively.

FIG. 11 is a schematic view for explaining the seventh step of FIG. 1,

1 and 11, in a seventh step S70, the lifting cable 211, the lifting plug 250, and the standing individual pipe 10 are lifted by the lifting device 200 to the ship 100 And then collecting the individual pipes 100.

The gripper 214 of the lifting device 213 is further connected to the individual pipe 100 and the gripper 214 is connected to the posture of the individual pipe 100 Can be used for control.

The chains 456 and 456a of the chain clamps 450 and 450a are connected to the individual pipes (not shown) by the cooperation of the workers of the crane unit 210 of the lifting device 200 and the workers of the pipe recovery station 110 of the ship 100 The chain clamps 450 and 450a and the lifting plug 250 can also be disassembled from the individual pipes 10 after the individual pipes 10 have been loaded into the individual pipe recovery lanes 110 have.

In the process of repeating the first to seventh steps S10 to S70, moving the fixed block 222 to another individual pipe further includes moving all the other individual pipes from the closed pipe line 1 to the ship 100 to the pipe recovery station 110 side.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. . Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and thus the present application is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

1: waste pipeline 10: individual pipe
100: Ship 200: Lifting device
211: lifting cable 221: guide cable
222: fixed block 250: lifting plug
300: residual oil recovery unit 400: ROV
450, 450a: chain clamp 500: cutting unit

Claims (5)

A first step of putting the remaining oil recovery unit and the ROV into water in a ship having a lifting device and separating the waste pipeline into individual pipes by the ROV;
A second step of inserting a guide line and a fixed block from the ship into a sea bed side to install a guide line between the sea floor around the individual pipe and the ship;
A third step of installing a chain clamp on an individual pipe by the ROV;
Connecting a lifting plug to the individual pipe by the ROV;
A fifth step of raising the lifting plug and the lifting cable by the lifting device to stand the individual pipes;
A sixth step of connecting the chain of the chain clamp to the guide line by the ROV; And
And a seventh step of raising the lifting cable, the lifting plug, and the standing individual pipes to the ship by the lifting device to recover the individual pipes. The method according to claim 1,
In the first step, the residual oil recovery unit includes a step of piercing a hole in a pipe wall of the waste pipeline and inserting a suction pipe through a perforated hole to suck residual oil in the waste pipeline A method of recovering a vertical lift lifting pipeline. 3. The method of claim 2,
In the second step, the block winch portion of the lifting device descends the guide line and the fixed block toward the bottom surface of the periphery of the individual pipe, and as the first winch portion applies the tension to the guide line, A method of recovering a vertical lifting type waste pipeline, the method comprising the step of bringing the guideline into a straight line state. The method according to claim 1,
Between the third step and the fourth step, the lifting device further lowering the lifting cable of the crane part to lower the lifting plug toward the working space between the cutting face of the closed pipeline and the end of the individual pipe A method of recovering a vertical lift lifting pipeline. The method according to claim 1,
In the sixth step, in a state in which the ROV catches the shackle provided at the end of the chain of the chain clamp so that the standing state of the individual pipe during the lifting can be guided by the guide line, Wherein the ROV connects the shackle to the chain clamp after the ROV has moved along the perimeter and the ROV connects the chain to the guide line in the form of a loop.

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