Auxiliary underwater compensator

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to compensators for vertical displacements of sea platform caused by roll. Device 100 serves to damp the forces between two interconnected parts in pipe string. Bottom part 101 is connected with top end of string element 105, 3a extending into underwater well 5. Top part 103 is suspended from self-floating surface plant 1 with the help of suspension element 3b extending to said surface plant. Device 100 is arranged pipe string above element 3a extending into said underwater well and above at least one part of said suspension element 3b. Device 100 comprises top and bottom sections 109, 111. Said sections can vertically displace relative to each other to cause pliancy to impact forces between said interconnected top and bottom parts 103, 101. Said impact forces are caused by roll of suspension elements 3b displacing relative to string element 3a.

EFFECT: efficient damping and protection of thread extreme turns.

15 cl, 7 dwg

 

The present invention relates to a device for safe connection and disconnection of columns of tubes in a submerged position with surface mounting. More specifically the present invention relates to a device to prevent the dangerous effects of vertical displacement caused by the motion of the surface of the unit during the connection or disconnection in a submerged position.

The level of technology

Equipment coastal surface installations such as drilling rigs, used for underwater wells, heave compensators, is well known. The heave compensator is placed between the column of pipes running down to the sea bottom and surface installation. When moving surface mounting vertically due to waves heave compensator ensures that the vertical movement of the installation is not passed to the string of pipe, holding the string of pipe is stationary and vertically relative to the seabed. However, when disconnecting the tubing from the equipment on the seabed, such as underwater drilling machine, pillar of the pipeline will provide some vertical movement, despite the presence of a heave compensator. For example, during the vertical movements of the surface installation 7 m, column pipes will ve Aetna, to move vertically up and down at a distance of approximately 30 cm

Due to the heave compensator surface mounting can continue to work even in quite rough seas with waves several metres in height. However, if conditions become extreme, work should be stopped, and the surface installation must be disconnected from the pipe string passing into the well.

For example, when drilling an underwater well from a floating drilling rig drill pipe may be several thousand meters down into the well. To remove the drill pipe from the drill rig drill pipe is suspended at the top of the well. To do this, drill pipe, first tighten the drill rig by a distance which approximately corresponds to the depth of the sea. Then to the bottom of the drill pipe is connected to the instrument for suspension and lowered it down to the top of the well to another drill pipe connected with the upper part of the tool for hanging. Tool for hanging the drill pipe is suspended at the top of the well, for example in the mouth of the well, wellbore, or protective sleeve for passing in a drilled well. After that, a tool for hanging disconnected from the drill pipe, which is located on the top and on the cat is Roy, he was omitted, thus it is disconnected from the drilling rig.

When restoring on the surface of normal operating conditions the rig can again be connected to the tool for hanging. A suspension component, such as drill pipe, down from the installation and connect with a tool for hanging. The specified tool for hanging pull up the drill rig and remove. After that drill pipe is again lowered, and the operation can be resumed.

When disconnecting a tool for hanging from a suspension component, such as above the pillar pipe element of the suspension will carry out a vertical movement, despite the presence of the heave compensator in the rig, if the drilling rig is affected by strong waves. Thus, soon after the separation, the column pipe may fall and collide with the part from which it was detached. With regard to the weight of the suspension elements, it can cause significant damage to both the connecting surfaces. Thus, the lower and upper mating coupling parts may be damaged. The same problem arises if necessary, reconnect the parts. As the convergence of the upper part with the lower part, by lowering the upper part from the surface, is beside the deliberate reduction occur reciprocating vertical movement. Before the upper fitting properly connect with the lower connecting part, the connecting surface may be damaged.

Traditional means of connection is threaded. So, when connecting or disconnecting, the upper connection part is rotated as it moves down to the lower part or drawing from it. So far the screw revolutions are often damaged. It is obvious that to solve this problem, you can use a carving of a larger size, resistant to significant impacts. However, large thread stipulate the use of a larger thread pitch that may increase the risk of spontaneous unscrewing of the connection. In addition, even large threads can be damaged enough to cause problems when connecting or disconnecting. In any case, the vertical movement during rolling will cause unwanted wear and tear.

You can also use other means of detachable connections. However, regardless of connection type, moving down the suspension element in the form of a pipe string, applies a substantial force, which in any case it is desirable to reduce.

Thus, the purpose of the present invention is to solve the above problem associated with damage to the joint surface during disconnection and connection.

With mnost inventions

According to the present invention proposed a damping device for damping forces between the two vzaimosoedinenie parts in the string of pipe, which contain lower part connected with the upper end of the element of the column, passing in an underwater well, and the upper part, which is suspended from the floating surface installation with at least one suspension element, passing to the specified surface mounting. Item pipe string can represent any element of the column, passing in an underwater well, such as wires, drill pipe or flexible pipe. According to the present invention, the damping device is mounted in the string of pipe over a portion of the column, passing in the specified underwater well, and under at least part of the specified element of the suspension. In addition, the damping device comprises upper and lower sections, which are made with the possibility of vertical movement relative to each other, thus ensuring compliance to impact forces between the specified vzaimosoedinenie upper and lower parts, the resulting vertical movement of the specified portion of the suspension elements during motion relative to the element of the column.

The term "vertically" should not be interpreted as a direction, are strictly but is normal to the horizontal direction. Instead, it has to be taken for the overall direction of the element columns or suspension component at the location of the damping device. Specified direction will be essentially vertical. However, it is possible deviation of this direction from the strictly vertical direction.

In one embodiment, the upper and lower sections are connected to each other with the possibility of rotation so that rotation of one section immediately or over time will cause rotation of the second section or the application of rotational forces. Thus, the rotational force applied to the string of drill pipe, for example, a floating surface installation, will be transmitted through the damping device down to the lower parts of the drill pipe located under a damping device.

In another embodiment, the specified element of the suspension is a drill string. Thus, the practical use of the damping device occurs when the drillstring must be suspended in an underwater well. In this case, the drill string is raised on a distance approximately corresponding to the deep sea, then to the remainder of the drill string attach tool for hanging. Then, a tool for hanging, or preferably by less than the least near it, attach the damping device. After this damping device is lowered on a drill string, after which the drill string becomes part of the suspension.

When disconnecting these vzaimosoedinenii parts item column preferably hung tool for hanging.

In one embodiment, the two vzaimosoedinenie parts form a threaded connection. Thus, when connecting or disconnecting these vzaimosoedinenii parts at a distance below the floating surface installation, for example in underwater well, the damping device provides protection at the threads from damage due to rolling.

Preferably, one of these sections has a section in which a portion of the second section can move in the vertical direction. This feature allows you to provide an implementation of the function of damping. In one embodiment, the specified second section takes place in the specified Department, with concentrically straight portion passes through concentrically hole in the partition, separation, resulting in rotational movement of the first section leads to the application of rotational force to the second section. Thus implemented one way of ensuring the transmission of rotational forces.

Also shown is the second section may include a piston element, located in the specified separation, and this separation is made in the form of a piston cylinder, between the piston cylinder and a piston element can be placed to seal to provide sealing.

In a preferred embodiment, the damping device comprises one or more channels for the inflow or outflow of the surrounding water, respectively, at the specified office or out of it, and the specified channel(s) works as a damper relative displacements between these two sections.

One of these vzaimosoedinenii parts can be combined with one of the specified sections. Thus, the function of the damping force will be implemented near the border of mutual connection that allows mainly to reduce the weight between the specified border and damping device.

In one embodiment, the damping device also includes a spring functionally disposed between the two sections for damping reciprocal vertical movement.

For proper operation of the proposed damping device preferably be located in the vicinity of these vzaimosoedinenii parts or boundaries between them. Therefore, the damping device preferably should be located closer to rscom bottom, and not to the surface when the control column is already suspended or shall be suspended in the well. In this case vzaimosoedinenie parts are usually located under the water near the mouth of the well.

Option run

Below is the detailed version of the non-limiting implementation, which is used to illuminate and explain the features and advantages of the present invention. Case is presented with reference to the drawings, in which:

figure 1 shows a schematic principle view of a floating drilling rig when reconnecting with a tool for hanging, which is suspended by a drill string, passing in an underwater well;

figure 2 shows a section view of two releasable vzaimosoedinenii parts in connected position, as well as the proposed damping device;

figure 3 shows a perspective view of the connection shown in figure 2;

figure 4 shows a perspective view with a section of the device shown in figure 3;

figure 5 shows a partial cross section of the connection;

6 shows an alternative embodiment of the proposed damping device; and

Fig.7 shows the section of the device shown in Fig.6.

Figure 1 shows a drilling rig 1 in the process of re-connection with drill pipe 3A, left in the underwater well 5. Drilling the mouth of the transportation 1, could be disconnected from the drill pipe 3A due to bad weather. Drill pipe 3b, passing down from the rig 1, detached from section 3A of the drill pipe. Drill pipe 3A in the underwater well may be several thousand meters into the seabed, for example, in the tank 7. When disconnecting from the drilling rig 1, drill pipe 3A is suspended tool 9 for hanging, located at the mouth 11 of the well at the seabed 13. It should be noted that figure 1 only shows a schematic diagram to show the likely situation if the proposed damping device.

Figure 2 shows a longitudinal section of the damping device 100 according to one embodiment of the invention. In this embodiment, the two vzaimosoedinenie and releasable parts 101, 103 are shown in the United state. Bottom vzaimosoedineniya part 101 has an internal thread 101A, while the upper vzaimosoedineniya part 103, respectively, has an external thread 103A. Thus, the lower and upper parts 101, 103 can be connected and disconnected by mutual rotation. The lower part 101 is arranged to connect with the pillar drill pipe 3A (figure 1), taking place in an underwater well 5 through section 105 of the pipe. Accordingly, the second part 103 is made with prob is the possibility of connection with drill pipe 3b through the site a pipe.

The device 100 comprises upper and lower sections 109, 111, which are made with the possibility of axial movement relative to each other. The lower section 111 has a branch street 111A, which is part of the upper section 109. This part has the form of a piston element a, which can make a reciprocating movement in the axial direction in the Department of street 111A. On the outer circumferential surface of the piston element a two fixed seals 109b, which provide a seal relative to the inner surface of the branch street 111A. The top section 109 is held in the Department of street 111A square end-to-end part C through the through hole s corresponding form in the top part of the lower section 111. Thus, rotation of the upper section 109 causes a corresponding rotation of the lower section 111.

Connection and disconnection of the threaded parts of the lower and upper sections 101, 103 may be secured by rotating the upper section 109 relative to the lower section 111.

It should be noted that in this embodiment, the lower section 111 of the device 100 is the same component as the upper vzaimosoedineniya part 103 mentioned above.

In the upper part of the lower section 111 is a through street 111A channels, which provide flow communication between division street 111A above the piston element a and the he sea water. The main function of the end-to-end channel street 111A is emptying the specified branch above the piston element a to avoid hydrostatic locking piston element a. A secondary function is the damping axial movement between the upper and lower sections 109, 111. This function is provided by performing end-to-end street 111A channels with the appropriate dimensions. Small cross-sections and a small number of channels tarry corresponding axial movement between the upper and lower sections 109, 111. On the other hand, larger cross-sections and a large number of channels will lead to less inhibition of the specified move.

As mentioned in the General part of the present description, during connection or disconnection of these two vzaimosoedinenii parts, the upper part can be moved up and down relative to the lower part due to the rolling of the floating surface installation to which it is suspended. Under the weight of the suspension elements, such as drill pipe 3b (figure 1), these movements can lead to substantial shock forces acting between these parts. From figure 2 it is obvious that the lower section 111 will be able to move in the axial or vertical direction relative to the upper section 109 to (and the donkey) alignment and connection vzaimosoedinenii parts 101, 103 with each other. Thus, at the initial stage fixture top vzaimosoedinenii part 103 to the lower part 101 this feature protects the extreme threaded coils and surface from damage. When disconnecting vzaimosoedinenii parts 101, 103 by unscrewing threads 101A, 103A these threads suitably protected from damage when moving down during rolling of the upper section 109 immediately before completion of unscrewing or immediately after it.

It should be noted that the through hole 113 is held in the axial direction over the entire structure shown in figure 2, from the site e pipes upstairs to section 105 of the pipe at the bottom, through vzaimosoedinenie part and through the upper and lower sections 109, 111. Thus in the United state is provided by running the message through the device 100.

Figure 3 and 4 show respectively a view in the perspective view of device 100, shown in figure 2, and the view is a perspective view in section of the device specified. As can be seen from figure 3, at the periphery of the bottom vzaimosoedinenii part 101 circumference, made of the four slots s. Top vzaimosoedineniya part 103 also has grooves s. These grooves s, s form a flow path of the medium between vzaimosoedinenie parts 101, 103 and the inner surface of the riser column (not shown). This facilitates vertical movement of the specified riser column, since the fluid in the column can flow freely past vzaimosoedinenii parts 101, 103. If the grooves C in the lower part 101 does not coincide with the corresponding grooves s in the upper part 103, a flow communication between divergent grooves s and s provides a made around the circumference of the groove 101b.

As can be seen from figure 4, the upper vzaimosoedineniya part 103 has two seals 103b, which provide a seal relative to the lower vzaimosoedinenii part 101 in the United status. One seal 103b are provided on each side (above and below) from the thread 103A. Together with the seals 109b seal 103b pressurized environment in the hole 113 and the camera 111 (below the piston element a) from the surrounding sea water, and Vice versa, in the United status.

As can be seen from figure 2 and figure 4, section 105 of the pipe attached to the bottom vzaimosoedinenii part 101 by means of the threaded bolts 115.

Figure 5 shows the top vzaimosoedineniya part 103 in the context, which in this embodiment is the same component as the lower section 111. This in particular illustrates a square-shaped through holes s and through part C that allows transmission of rotational forces.

According to the present invention, the upper and lower vzaimosoedinenie parts are not necessarily part of the design, the tion, as shown in an embodiment described with reference to figures 1-5. Instead vzaimosoedinenie part can be located either below or above the proposed damping device. However, to achieve the main goal of the present invention suitable way damping device must be located above vzaimosoedinenii parts in position, providing for the placement of a small mass between these parts and the damping device. This mass can cause the above-described undesirable forces between vzaimosoedinenie parts directly before connecting or immediately after separation vzaimosoedinenii parts due to vertical movement of the specified mass during motion.

On the other hand, at the location of the damping device below vzaimosoedinenii parts it should preferably be located close to them. This minimizes the weight between the damping device and vzaimosoedinenie parts, which reduces the inertia of the specified device and thus reduce the force produced by the collision of two vzaimosoedinenii parts. At the location of the damping device below vzaimosoedinenii parts of the damping device may contain a spring clamped device for pressing the upper section in ve is khnemu position, thereby pushing the upper section down in the event of a collision vzaimosoedinenii parts.

Figure 6 and 7 show respectively a top view and a view in section of an alternative implementation of the proposed damping device 100'. On these drawings vzaimosoedinenie part not shown. The upper part of the upper section 109' and the lower part of the lower section 111 have threaded connecting surface for connection with a lock drill pipe. Thus, the device 100' is made with possibility of installation in a drill string between its parts.

In addition, in this embodiment, the means for providing transmission of rotational forces between the upper and lower sections 109', 111' are held in the axial direction of the sliding strip 109f, which take place in response grooves 111f' at the top of the lower section 111'.

Regardless of the location of the damping device 100, 100' relative to vzaimosoedinenii parts 101, 103, it can be equipped with a spring clamped devices (not shown) for pre-specified upper and lower sections 109, 109', 111, 111' in extended in the axial direction position. Thus, the damping device 100, 100' at any time, if it is not compressed in the axial direction, to be in readiness to resist the effects of vertical forces resulting from the collision.

Preferably, the damping device is located within 30 m of the boundary between vzaimosoedinenie parts. Even more preferably the location of the specified device within 10 or even 5 m from the border between vzaimosoedinenie parts. However, in the preferred embodiment, the one vzaimosoedinenii parts is one of the sections of the damping device.

1. Column pipe, such as drill string, passing in an underwater hole (5) through the mouth (11) of the wells on the seabed (13)containing the tool (9) for hanging and two vzaimosoedinenie parts, of which the lower vzaimosoedineniya part (101) is attached to the upper end of the element (105, 3A) of the column, passing in an underwater well (5), and the upper vzaimosoedineniya part (103) is suspended from the floating surface installation (1) using at least one element (3b) of the suspension, with the specified element (105, 3A) of the column and the element (3b) of the suspension components are specified column, characterized in that it contains a damping device (100)designed for damping forces and installed in the string of pipe above the specified element (105, 3A) of the column, passing in an underwater well (5), and under at least part of the specified element (3b) of the suspension going up to the surface installation (1)place, which is near the e to the seabed (13), than the sea surface, when the element (3A) of the column is already suspended or shall be suspended in the well (5), and a damping device (100) comprises upper and lower sections (109, 111), which are made with the possibility of vertical movement relative to each other thus to provide flexibility when shock forces acting between these vzaimosoedinenie upper and lower parts (103, 101) and the resulting vertical movement during rolling of the specified part (3b) of the suspension is moving relative to the element (3A) of the column.

2. Column pipe according to claim 1, characterized in that the upper and lower sections (109, 111) are connected to each other with the possibility of rotation so that rotation of one section immediately or over time will cause rotation of the second section or the application of rotational forces.

3. Column pipe according to claim 1, characterized in that the specified element (3b) of the suspension is a drill string.

4. Column pipe according to claim 1, characterized in that when the separation of these vzaimosoedinenii parts (101, 103) element (3A) suspension suspended tool for hanging.

5. Column pipe according to claim 1, characterized in that the two vzaimosoedinenie part (101, 103) are threaded connection (101A, 103A).

6. Column pipe according to claim 1, characterized in that one the of these sections (109, 111) has a branch (street 111A), in which part (a) of the second section may perform a reciprocating movement in the vertical direction.

7. Column pipe according to claim 6, characterized in that the second section takes place in the specified Department (street 111A) of its concentrically end-to-end part (s)passing through concentrically hole (s) having a separation section with ensuring the application of rotational forces to one section at a rotational movement of the other sections.

8. Column pipe according to claim 6, characterized in that the second section contains a piston element (a)located in the specified Department (street 111A), and the specified Department (street 111A) is made in the form of a piston cylinder, while between the said piston cylinder and a piston element (a) is the seal (109b) to ensure a proper seal.

9. Column pipes according to claim 8, characterized in that the damping device (100) includes at least one channel (111d) for inflow or outflow of the surrounding water, respectively, at the specified office (street 111A) or out of it, with the specified at least one channel serves as a damper relative displacements of these two sections (109, 111).

10. Column pipe according to any one of claims 1 to 9, characterized in that one of these vzaimosoedinenii parts (103) combined with one of these sections (11).

11. Column pipe according to any one of claims 1 to 9, characterized in that the damping device (100) is installed below the boundary between these vzaimosoedinenie parts (101, 103).

12. Column pipe according to any one of claims 1 to 9, characterized in that the damping device (100) is located above the boundary between these vzaimosoedinenie parts (101, 103).

13. Column pipe according to any one of claims 1 to 9, characterized in that the damping device (100) is installed within 30 meters from the border between these vzaimosoedinenie parts (101, 103).

14. Column pipe according to any one of claims 1 to 9, characterized in that the damping device (100) also includes a spring functionally established between these two sections (109, 111) for damping reciprocal vertical movement.

15. Column pipe according to any one of claims 1 to 9, characterized in that the damping device (100) is performed by providing flow communication between the two pipes attached to each end of the specified device.



 

Same patents:

FIELD: oil and gas production.

SUBSTANCE: sections of pipes (52, 54) are connected successively and are supported vertically relative to floating vessel (12) to assemble section of column (68B-68D); this section is immersed into sea so, that nearest end (56) of section rests on floating vessel. Towboat (30) stretches out the section of the column along a doubled chain line by means of hauling in towing cable (34) connected with further end (65) of the column. When further end of the column is situated near one of the borehole of underwater wells of the oil deposit, this end is transported for connecting it to the borehole using a transport vessel with remote control. During assembly tension in the pipe column is maintained at a required level by facilitating location of the section of the nearest end of the column, which is below floating vessel (12), so, that the column is stretched at angle (70) to vertical, which continuously stays within the preliminary set interval from 3 to 12.

EFFECT: invention facilitates pipe-lay avoiding damage of pipe sections and simultaneously reduces operational costs.

8 cl, 5 dwg

FIELD: transport.

SUBSTANCE: flexible pipeline or hydrocarbons transportation system between the installation, located on the seabed and the vessel on the sea surface. Uprise pipeline is equipped with a device for its protection against impact which closes at least the top of the uprise pipeline. The device to protect the uprise pipeline is formed by flexible element and a multitude of individual hollow components, each of which is suspended on chains or ropes. This device is equipped with tensile or tightening devices, which is preferably attached to the lower end of the device to protect the uprise pipeline.

EFFECT: protection of upper part of uprise pipeline.

13 cl, 8 dwg

The invention relates to a system for offshore production of oil or gas containing vessel with means for maintaining the desired position and orientation, the bottom installation on the seabed for at least two production wells and product pipelines to connect the bottom of the installation vessel

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Underwater well // 2186933
The invention relates to a device for underwater well for the extraction of oil or gas in the open sea, which contains the wellhead, x-Mas tree valves installed at the wellhead and at least one ascending pipe for connection with a mining ship on the sea surface

Underwater module // 2186932
The invention relates to an underwater module or station for oil or gas in the open sea, which contains at least two wellhead with related surface valves and manifold on fundametnal frame (base plate)

FIELD: oil-and-gas production.

SUBSTANCE: tensioner system comprises hydropneumatic tensioner assembly flexible suspended to floating platform and water separation string support conductor string surrounding water separation string. Said support conductor string transfers tensioning force form hydropneumatic tensioner via conductor string joint to water separation string. Water separation string link support assembly transfers tensioning force from support conductor to tensioning link of said string. Tensioner compensates balances platform relative displacements including pitch, heaving and yaw. Besides, reactive load assembly is mounted on the platform to take up dynamic bending moment at two points applied to water separation string support conductor to counteract conductor rotation.

EFFECT: higher reliability.

26 cl, 10 dwg

The invention relates to the field of offshore drilling, in particular to a device providing compensation for heave of the drilling vessel to ensure maintenance of drill pipe under tension

The invention relates to the drilling technique, namely, devices for drilling and offshore field development

FIELD: oil-and-gas production.

SUBSTANCE: tensioner system comprises hydropneumatic tensioner assembly flexible suspended to floating platform and water separation string support conductor string surrounding water separation string. Said support conductor string transfers tensioning force form hydropneumatic tensioner via conductor string joint to water separation string. Water separation string link support assembly transfers tensioning force from support conductor to tensioning link of said string. Tensioner compensates balances platform relative displacements including pitch, heaving and yaw. Besides, reactive load assembly is mounted on the platform to take up dynamic bending moment at two points applied to water separation string support conductor to counteract conductor rotation.

EFFECT: higher reliability.

26 cl, 10 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to compensators for vertical displacements of sea platform caused by roll. Device 100 serves to damp the forces between two interconnected parts in pipe string. Bottom part 101 is connected with top end of string element 105, 3a extending into underwater well 5. Top part 103 is suspended from self-floating surface plant 1 with the help of suspension element 3b extending to said surface plant. Device 100 is arranged pipe string above element 3a extending into said underwater well and above at least one part of said suspension element 3b. Device 100 comprises top and bottom sections 109, 111. Said sections can vertically displace relative to each other to cause pliancy to impact forces between said interconnected top and bottom parts 103, 101. Said impact forces are caused by roll of suspension elements 3b displacing relative to string element 3a.

EFFECT: efficient damping and protection of thread extreme turns.

15 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to risers and associated fixing structure used during production of hydrocarbons from subsea strata. The system for fixation of a chain riser coupled to the floating offshore platform includes a tension pipe. The tension pipe has the upper section connected to the floating offshore platform in the first position, the middle section of the prestressed link and the lower section. A bushing is inserted around length of the middle section of the prestressed link. Inner diameter of the bushing and outer diameter of the middle section form an annular gap between them. The system comprises a guide coupled to the floating offshore platform in the second position different from the first one. The guide is located so that it surrounds the bushing at least partially.

EFFECT: the invention ensures durability of the tension tube durability for chain risers.

19 cl, 10 dwg

FIELD: transport.

SUBSTANCE: flexible pipeline or hydrocarbons transportation system between the installation, located on the seabed and the vessel on the sea surface. Uprise pipeline is equipped with a device for its protection against impact which closes at least the top of the uprise pipeline. The device to protect the uprise pipeline is formed by flexible element and a multitude of individual hollow components, each of which is suspended on chains or ropes. This device is equipped with tensile or tightening devices, which is preferably attached to the lower end of the device to protect the uprise pipeline.

EFFECT: protection of upper part of uprise pipeline.

13 cl, 8 dwg

FIELD: oil and gas production.

SUBSTANCE: sections of pipes (52, 54) are connected successively and are supported vertically relative to floating vessel (12) to assemble section of column (68B-68D); this section is immersed into sea so, that nearest end (56) of section rests on floating vessel. Towboat (30) stretches out the section of the column along a doubled chain line by means of hauling in towing cable (34) connected with further end (65) of the column. When further end of the column is situated near one of the borehole of underwater wells of the oil deposit, this end is transported for connecting it to the borehole using a transport vessel with remote control. During assembly tension in the pipe column is maintained at a required level by facilitating location of the section of the nearest end of the column, which is below floating vessel (12), so, that the column is stretched at angle (70) to vertical, which continuously stays within the preliminary set interval from 3 to 12.

EFFECT: invention facilitates pipe-lay avoiding damage of pipe sections and simultaneously reduces operational costs.

8 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to compensators for vertical displacements of sea platform caused by roll. Device 100 serves to damp the forces between two interconnected parts in pipe string. Bottom part 101 is connected with top end of string element 105, 3a extending into underwater well 5. Top part 103 is suspended from self-floating surface plant 1 with the help of suspension element 3b extending to said surface plant. Device 100 is arranged pipe string above element 3a extending into said underwater well and above at least one part of said suspension element 3b. Device 100 comprises top and bottom sections 109, 111. Said sections can vertically displace relative to each other to cause pliancy to impact forces between said interconnected top and bottom parts 103, 101. Said impact forces are caused by roll of suspension elements 3b displacing relative to string element 3a.

EFFECT: efficient damping and protection of thread extreme turns.

15 cl, 7 dwg

FIELD: construction.

SUBSTANCE: invention relates to the devices for joining and connecting the first and second pipelines, containing the ends (E1, E2) of the first and second pipes at the sea bottom in the place of connection. Connecting device (10) comprises the first connecting part (1), holding the end (E1) of the first pipeline; the second submersible connecting part (2), holding the end (E2) of the second pipeline and connector (3), disposed between the connecting parts (1, 2) for the final connection of ends (E1; E2) of pipes inter se. The guiding device (5) cooperates with the guiding structure (4) during lowering of the second connecting part (2) to the first connecting part (1) and rotates the second connecting part (2) for preliminary alignment of the end (E2) of the second pipeline towards the end (E1) of the first pipeline, so that the first and second pipelines are brought to the alignment with each other at the sea bottom. Auxiliary inclined structure (6) with stop surfaces and guide means cooperates with the second connecting part (2) and facilitates the precise alignment of the ends (E1, E2) of pipes.

EFFECT: improvement of joining and connection.

14 cl, 13 dwg

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