KR19990030960A - Offshore drilling - Google Patents

Abstract

The present invention relates to an offshore drilling ship that can perform drilling operations in a stable state by buoyancy of buoys, and to facilitate the drawing of the support pile during installation or dismantling. The frame 1 fixed to a certain height difference and attached to the upper frame 11 of the frame 1, the stern 21 and the boring machine 22 for drilling work is located in the center and four sides As a winch 23 for adjusting the sliding pipe (4) and the workbench (2) is installed on the four corners, the winch 23 for adjusting the anchor 24, and the four sides of the hull and buoy support (5) In order to reduce the friction with the guide pile (3) to be installed in the sliding pipe (4) provided with a roller (41), buoy support (5) provided at the lower end of the sliding pipe (4), this buoy support Fixed to (5) and connected to the pump 26 of the worktop (2) Buoy 6 generating buoyancy with water hose 61 and air hose 62, and is installed underwater to parallel the role of the hull and the guide role of the casing and rod 74, the lower end to the ground A low plate support flange 71 is provided to increase the area, and a weight 72 is installed to increase the support load over the low plate support flange 71. The fastening means 73 can be assembled and separated into multiple stages. It characterized in that it is composed of a support pile (7).

Description

An ship for drilling the sea

The present invention relates to a drilling vessel used for offshore drilling operations, specifically, the drilling operation is performed in a stable state by buoyancy support and buoyancy of buoys fixed to the buoy support at the lower end of the sliding pipe installed on the four sides of the hull. It is possible to facilitate the extraction of the support pile during installation or removal.

Due to the gradual depletion of terrestrial resources, interest in the ocean is increasing, and the importance of accurate offshore drilling is emerging as a preliminary stage of marine resource development.

Conventional offshore drilling ships have been mainly used in the harbors and shallow waters, but due to the deterioration of the conditions for drilling such as the enlargement of the port construction, deepening of the construction location, and super soft layer, accurate data can be obtained by the conventional drilling ships. Therefore, new drilling ships are required that are not affected by deep sea and sea conditions.

In addition, boring work that requires work at a constant temperature is not possible due to fluctuations in the surface of water and fluctuations in the tide when the wind wave is less than 1m high. New drilling ships are needed.

In general, the drilling work at sea is carried out at low tide, and it is performed only for the rest of the time except the time required to move to the drilling site and the time of returning to the port of call. It is required to be able to minimize. Normally, the time spent for moving and drilling is about 10 hours, which takes 2 hours to move to the drilling site, 2 hours to return to the port of call, and satisfactory conditions for drilling for the remaining 6 hours.

Conventional floating offshore drilling vessels have a buoyancy body installed in a flat arrangement (horizontal) between the upper and lower plates of the workbench so that the upper and lower plates of the workbench support the buoyancy body and provide the buoyancy force for the buoyancy body to work on the workbench. It is.

However, this structure has the advantage that it is possible to spend relatively much time for drilling work because the movement to the drilling site and the port of port is rapid, but the work bench is kept floating by the buoyancy of the buoyant body arranged in a plane. Therefore, the horizontal and vertical forces due to the wave force are transmitted as it is, the horizontal and vertical flow is severely there was a problem that the entire drilling line is severely shaken.

The self-elevating drilling ship, which has been proposed to improve the problems of the conventional floating offshore drilling ship, installs a buoyancy body between the upper plate and the lower plate of the workbench, and has four support piles at four corners of the workbench. When the drilling work is installed by mounting the support pile to the bottom of the seam to be fixed, and when towing the drilling ship, the support pile is pulled up to the work table to make a navigation.

However, the drilling vessel of this structure has excellent characteristics to withstand the ocean waves, but when moving to the drilling site and fixing the support pile to the soft layer and pulling the support pile from the sea surface layer to return to the port of call after the drilling work is completed. Since it takes a lot of time, there is a problem that the time that can be devoted to the actual drilling operation is greatly shortened, and when the support file is lifted to tow while being fixed in the sea bed layer, the support file is not easily drawn from the sea surface layer. In the process of forcibly drawing, the entire drilling ship had a problem of overturning.

Therefore, the present invention is to solve the problems of the conventional drilling vessel as described above to exclude the effects of fluctuations due to the wave and to carry out the drilling work in a stable state and to install buoys to generate buoyancy to support the installation or dismantling Its purpose is to provide an offshore drilling rig that facilitates drawing out of piles.

In order to achieve the above object, the present invention is a drilling vessel for offshore drilling, the frame (1) and fixed to the square upper frame (11, 12) with a certain height difference, and the upper frame of the frame (1) (11) attached to the center and located in the center for drilling samba 21 and boring machine 22, the winch 23 for adjusting the sliding pipe (4) on the four sides and the anchor 24 on the four corners The roller 41 is installed to reduce the friction between the worktable 2 on which the winch 23 for adjusting) and the guide pile 3 installed on the four sides of the hull and installed on the buoy support 5. A sliding pipe 4, a buoy support 5 provided at the lower end of the sliding pipe 4, and a water hose fixed to the buoy support 5 and connected to the water pump 26 of the upper plate of the work table 2; A buoy 6 configured with an air hose 62 for keeping the inside of the buoy 6 at atmospheric pressure; It is installed in the middle of the hull and the support role of the casing and the rod (74) in parallel with the bottom plate support flange 71 for increasing the ground area with the ground is installed and supported above the bottom plate support flange (71) It installs the weight 72 for increasing the load and is characterized in that it is composed of a support pile 7 to be separated and assembled into a plurality of stages by the fastening means 73.

Another feature of the present invention is to generate buoyancy by draining water through the water pump 26 installed on the workbench 2 when buoyancy is generated in the buoy 6 and reducing the buoyancy by adding water during movement to lower the center of gravity. As it moves, it is possible to move in the stable state of the hull. And the air hose 62 is installed so that one side is exposed to the atmosphere so that the inside of the buoy 6 to the atmospheric pressure state.

Another feature of the present invention is that the self-support buoy 6 is supported by the buoyancy for the vertical load, the horizontal load is supported by the tension of the anchor 24 connected to each corner of the work platform (2) .

1 is an overall cross-sectional view of the drilling vessel of the present invention

2 is a plan view of the drilling vessel of the present invention

3 is a main view of the connection state of the work table and buoy;

4 is a mounting state of the worktable and the sliding pipe

5 is a winch mounting state for adjusting the anchor

6 is a main view of the guide file and the sliding pipe

Figure 7 is a plan view of the main assembly state of the guide file and the sliding pipe

Fig. 8 is a sectional view of a buoy part

9 is a top view of FIG. 8

10 is a cross-sectional view of the buoy support

11 is a sectional view of main parts of the support pile portion;

<Description of the codes for the main parts of the drawings>

1: frame

11: upper frame 12: lower frame

2: worktable

21: Sambari 22: Boring Machine

23: winch 24: anchor

25: wire 26: water pump

27: intake drain hose

3: guide file

31 pulley

4: sliding pipe

41: Roller 42: Band

5: buoy support

6: buoy

61: water hose 62: air hose

7: support pile

71: support plate flange 72: weight

73: fastening means 74: rod

Hereinafter, the drilling vessel for sea drilling according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the drilling vessel of the present invention. As shown, the drilling line of the present invention includes a frame 1 composed of upper lower frames 11 and 12, a work table 2 attached to the upper frame 11 of the frame, and guides installed at four sides of the hull. Pile (3) and sliding pipe (4), buoy support (5) is installed on the lower end of the sliding pipe (4), buoy (6) fixed to the buoy support (5), is installed in the water to support the hull role and casing And a support pile 7 which parallelly serves as a guide of the rod 74.

The frame 1 is composed of square upper lower frames 11 and 12, and the upper lower frames 11 and 12 are connected and fixed to maintain a predetermined height interval (see FIGS. 1 and 2).

The workbench 2 is installed on the upper frame 11 of the frame 1, and in the center is a stern 21 for drilling and a boring machine 22 for boring, and sliding on four sides. A winch 23 for adjusting the pipe 4 and a winch 23 for adjusting the anchor 24 connected to the wire rope 25 are installed at four corners, and water connected to the buoy 6 to one side. A water pump 26 for filling water is installed in the hose 61, and is connected to the water pump 26, and a drinking drain hose 27 is formed to collect and drain water from the buoy 6 (FIG. 3). 4, 5)

The guide file (3) is installed on the buoy support (5) is located on the four sides of the worktable (2), the upper wire rope wound on the winch 23 to adjust the vertical movement of the sliding pipe (4) A pulley 31 for excluding interference of 25 is configured. (See Fig. 6).

The sliding pipe (4) is guided to the guide file (3), by sliding the hull up and down by the winch 23 is installed on the four sides of the worktable (2), the winch 23 and sliding to adjust the sliding The wire 42 is connected to the band 42 of the pipe 4. In addition, a roller 41 is provided to reduce friction with the guide pile 3 so that the hull can be operated up and down smoothly (see FIGS. 6 and 7).

The buoy support 5 is installed at the lower end of the sliding pipe 4, and serves to prevent the buoy 6 from rising due to water pressure in the water (see FIG. 10).

The buoy 6 is fixed to the buoy support (5) is provided with a water hose 61 and air hose 62 is connected to the water pump 26 installed on the upper plate of the worktable (2), and generates buoyancy to It is to prevent the load from being transferred directly to the support pile (7). Here, the air hose 62 is one end is exposed to the atmosphere so that the interior of the buoy 6 does not become a vacuum state to facilitate the filling and draining of water (see FIGS. 8 and 9).

The support pile 7 is configured to be assembled and detachable at each end by the fastening means 73, and the bottom plate support flange 71 and the bottom plate support flange to increase the contact area with the ground to maintain the stability of the hull ( At the upper end of 71, a weight 72 for increasing the supporting load is provided (see Fig. 11).

The drilling vessel of the present invention constituted as described above generates the buoyancy by draining the water of the buoy 6 through the water hose 61 connected to the water pump 26 installed on the upper surface of the worktable 2 so that the self load of the hull is directly supported. By not transmitting to (7), it is possible to carry out the drilling work in a stable state by removing the influence of fluctuations due to waves in the geological layer of the soft layer, and to facilitate the drawing of the support pile (7).

The drilling line of the present invention is supported by the buoy 6 for the self-supporting load with respect to the vertical load, but is supported by the tension of the anchor 24 connected to each of the four corners for the horizontal load (wind, tidal, etc.).

In addition, the support pile 7 in the water serves as a guide file of the casing and the rod 74 together with the supporting role of the entire drilling vessel. This support pile 7 uses a material that can withstand underwater currents and other external forces, and also serves to protect the casing and rod 74 from external forces.

The casing, which was used once in the existing deep work paper, was not bent and used, and this support pile (7) completely eliminated the bending phenomenon, thereby greatly reducing the work cost.

As described above, the characteristics of the offshore drilling vessel of the present invention are easy to assemble and dismantle, so that they can be moved to land during long distance movement. Hereinafter, the hypothesis and movement of the drilling vessel of the present invention will be described.

(One). Assemble the drilling ship on land.

(2). After buoyancy is reduced by filling the buoy 6 through the water hose 61 using the water pump 26 so as to be floated by the buoyancy of the drilling vessel itself at the average sea level or at sea level, the buoyancy point is investigated by preliminary drilling. Sue until.

(3). Using the most advanced surveying equipment at the survey point, the correct position is used, then the work bench (2) is raised to the surface using the winch (23) and balanced using buoyancy.

(4). After the bottom plate support flange 71 is left, the anchor 24 is anchored with a drawing line.

(5). After the anchor 24 is placed, the height of the work bench 2 is adjusted with the winch 23 so that the work position is possible (at least 1 m from the surface of the water so as not to be affected by the blue), and the anchor wire 25 with the winch 23. Tension) to create the best working conditions so as to be stable to all external forces.

(6). At the time of movement, the buoy 6 is filled with water using the water pump 26 to lower the work table 2 to the surface while gradually decreasing the buoyancy.

(7). The anchor 24 is lifted using the anchor line and the anchor wire winch 23 and then moved to the next point using the preliminary line.

Drilling line for offshore drilling of the present invention as described above can be manufactured by reducing buoyancy support by installing the buoy support on the bottom of the sliding pipe and by installing only one buoy on the lower part of the buoy support and the upper support pile to reduce the production cost, soft layer When working in Esau, the weight and buoyancy of the work table are the same to facilitate the drawing of the support pile and the work is done at least 1m above the water surface, so it is not affected by the waves at all. Height can be adjusted freely by winch, so there is no influence of horizontal load. It is easy to assemble and disassemble work table and support pile, so it can be moved to the land when moving long distance, and casing and rod can pass through the support pile. To prevent accurate bending Would that have complex effects such as that.

Claims (3)

In the drilling line for offshore drilling, the frame 1 which fixed and connected the square upper frame 11 and 12 with a fixed height difference, and is attached to the upper frame 11 of this frame 1, and is drilled in the center part. Samba 21 and boring machine 22 for the location is located on the four sides of the winch 23 for adjusting the sliding pipe 4 and the four corners are installed winch 23 for adjusting the anchor 24 A sliding pipe (4) provided with a roller (41) to reduce friction between the worktable (2) and the guide pile (3) installed on four sides of the hull and installed on the buoy support (5), and this sliding pipe (4) Atmospheric pressure of the buoy support (5) installed at the lower end, the water hose 61 and buoy (6) fixed to the buoy support (5) and connected to the water pump 26 of the upper plate of the work table (2) Buoy 6, which is configured with an air hose 62, one side is exposed to the atmosphere in order to maintain the The support role of the fishing vessel and the guide role of the casing and the rod 74 are parallel to each other, and a bottom plate support flange 71 is installed at the lower portion to increase the ground area with the ground, and the support load is placed on the bottom plate support flange 71. Offshore drilling ship, characterized in that consisting of a support pile (7) to install the weight 72 for increasing and to be assembled into a plurality of stages by the fastening means (73). According to claim 1, when buoyancy is generated in the buoy (6) to drain the water through the water pump 26 installed in the workbench 2 to generate buoyancy, and during the movement to add buoyancy to reduce the buoyancy to lower the center of gravity Offshore drilling ships, characterized in that to move in a stable state of the hull. The method of claim 1, wherein the self-supporting buoy 6 is supported by buoyancy with respect to the vertical load, and is supported by the tension of the anchor 24 connected to each corner of the work platform 2 with respect to the horizontal load. Offshore drilling ship.