KR101359533B1 - Apparatus for Fixing Drilling Pipe - Google Patents

Abstract

The present invention relates to a fixed structure of a drilling pipe for fixing a drilling pipe to a ship, according to one embodiment of the present invention, having a first axis in the horizontal direction as a rotation axis, rotatable about the first axis with respect to the hull And a first axis having an opening and a second axis facing in a direction orthogonal to the first axis as a rotation axis, the opening of the first plate being rotatably around the second axis, and being vertically Provided is a fixing structure for a drilling pipe including a second plate on which a drilling pipe installed in a vertical direction is fixed to a door pool formed to penetrate the hull.

Description

Apparatus for Fixing Drilling Pipe}

The present invention relates to a fixed structure of a drilling pipe for fixing a drilling pipe to a ship.

1 is a view briefly showing a conventional drillship drilling in the seabed.

As shown in FIG. 1, the vessel 10 and the subsea oil field 5 are connected by a drilling pipe 20, wherein the drilling pipe 20 is connected to the vessel 10 and the subsea oil field 5. The portion coupled to the borehole 7 has an approximately vertical angle, and the drilling pipe 20 is manufactured to be somewhat curved within the physical properties of the elastic limit of the steel material in preparation for the effects of waves and tidal currents.

On the other hand, the drillship is preferably located in the vertical portion of the borehole so that the drilling pipe is as straight as possible, may be out of the position of the vertical portion of the borehole due to algae and sea wind or other factors. In this case, the drillship corrects the position through a dynamic positioning system (DPS), but the resolution of the positioning is deteriorated to the extent that the situation may deteriorate to the extent that the position can be held as an output of the dynamic positioning system or the precision of the dynamic positioning system. If is low, the position correction may fail and the drill ship may deviate from the vertical upper portion of the borehole as shown in FIG.

On the other hand, since the ship is always floating on the surface of the water as shown in Figures 2 and 3, the shaking (rolling) swinging about the longitudinal direction of the hull by waves and wind, and swings about the direction perpendicular to the longitudinal direction Pitching occurs.

As the drilling pipe 20 may be slightly bent, as shown in FIG. 1, the position of the vessel 10 is slightly deviated from the upper portion of the borehole 7 due to the influence of the algae, or as shown in FIG. 3. Even if the ship 10 is slightly inclined by the waves, a certain amount of displacement is absorbed by the drilling pipe 20, and the limit of the displacement amount is determined as a prescribed value when the ship is manufactured, and the prescribed value when the ship 10 is operated. Operate ship 10 within.

However, as shown in FIG. 1, the effects of waves and tides on the sea, such as bad weather, are severe, so that the position of the ship 10 deviates more than the prescribed value d from the borehole 7 or as shown in FIG. If the inclination degree 10 becomes larger than the prescribed value, the drilling pipe 20 may be damaged due to a large stress applied to the portion 15 coupled to the ship.

Therefore, in consideration of the above-mentioned weather conditions, the degree of inclination of the ship 10 due to the high wave is out of the prescribed value or the velocity of the algae is increased so that the position of the ship 10 from the borehole 7 is defined by the prescribed value d. If it is out of the need to stop the drilling operation or disconnect and evacuate the drilling pipe 20 there is a problem that affects the productivity.

United States Patent 4,576,516

The present invention is to solve the above problems, as the ship is inclined in accordance with the wave or the position of the ship falls from the borehole to reduce the stress generated at the combined point of the drilling pipe can expand the range of work available It is an object to provide a fixed structure of a drilling pipe.

The problems of the present invention 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.

In order to solve the above problems, according to one embodiment of the present invention, a first plate having a first axis in the horizontal direction as a rotation axis, rotatably provided about the first axis with respect to the hull, and an opening is formed. And a second shaft facing in a direction orthogonal to the first axis as a rotation axis, and provided in the opening of the first plate so as to be rotatable about the second axis, the door pool being formed to penetrate the hull in the vertical direction in the vertical direction. There is provided a fixing structure of a drilling pipe comprising a second plate on which a drilling pipe to be installed is fixed.

Any one of the first axis and the second axis may be provided to be parallel to the longitudinal direction of the hull.

The first plate and the second plate may further include a restoring unit for applying a restoring force to at least one of the first plate or the second plate to restore the horizontal state.

The restoration unit is fixed to the hull, the frame and one end is extended to the upper side of the first plate and the second plate is supported on the frame, the other end is coupled to the second plate of the first plate and the second plate Deformed by rotation, and may include a spring for restoring the first plate and the second plate in a horizontal state while being restored by the elastic force.

The spring may be provided in plurality.

In addition, the spring may be a tension coil spring for distributing at least a portion of the load applied to the first plate or the second plate to the frame.

On the other hand, the restoration unit is fixed to the hull, the frame extending to the upper side of the first plate and the second plate, a plurality of winches and one end provided in the frame are coupled to different points of the second plate, the other end It may include a plurality of cables wound around each winch to adjust the inclination of the first plate and the second plate while winding or unwinding the winch in accordance with the rotation of each winch.

In addition, the restoration unit is provided on the first axis of the first plate and the second axis of the second plate, respectively, and deformed as the first plate and the second plate are rotated, and restored by the elastic force to the first. It may also include a spiral spring to restore the plate and the second plate to a horizontal state.

According to the fixing structure of the drilling pipe of the present invention has the following effects.

First, since the stress applied to the portion of the drilling pipe coupled with the ship can be reduced according to the inclination and position movement of the ship, the fatigue applied to the drilling pipe is low and the drilling depth can be drilled deeper than the existing drilling depth.

Second, there is a range that the ship should be located from the borehole for drilling, and drilling is possible in a wider range that is wider than the conventional range, so that even if the algae is instantaneous, there is more room to respond, resulting in longer production duration and productivity. This can be dramatically improved.

Third, when the wave is high, conventionally, since excessive stress is generated at the coupling point of the drilling pipe and the ship, the work is not continued and the coupling of the drilling pipe and the ship is released. According to the present invention, the drilling is performed as the ship is inclined. Since the stress applied to the coupling point between the pipe and the ship is reduced, the allowable slope of the ship is higher than that of the conventional, so that the work can be continued even when a wave higher than the conventional allowance can be produced, thereby significantly improving productivity.

The effects of the present invention 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.

The foregoing summary, as well as the detailed description of the preferred embodiments of the present application set forth below, may be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown preferred embodiments in the figures. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
1 is a view showing a conventional ship drilling in a subsea oil field using a drilling pipe at a position deviated by a distance d from a borehole;
2 shows a direction in which a ship moves at sea;
3 is a view showing a conventional vessel drilling in a subsea oil field using a drilling pipe in an inclined state;
4 is a perspective view of a ship having a fixing structure of a drilling pipe according to a first embodiment of the present invention;
5 is a perspective view showing a fixing structure of the drilling pipe according to the first embodiment of the present invention;
FIG. 6 is a perspective view showing another form of FIG. 5; FIG.
7A is a perspective view showing a fixing structure of a drilling pipe according to a second embodiment of the present invention;
FIG. 7B is a II cross-sectional view of FIG. 7A;
8A is a perspective view showing a fixing structure of a drilling pipe according to a third embodiment of the present invention;
FIG. 8B is a II-II cross sectional view of FIG. 8A;
9A is a perspective view showing a fixing structure of a drilling pipe according to a fourth embodiment of the present invention;
FIG. 9B is a sectional view taken along III-III of FIG. 9A;
10 is a perspective view showing a fixing structure of a drilling pipe according to a fifth embodiment of the present invention;
FIG. 11 is a perspective view illustrating a form in which a spiral spring is deformed according to rotation of the first and second axes of FIG. 10;
12 is a view showing a state in which a ship equipped with a fixed structure of a drilling pipe of the present invention is drilled in a subsea oil field using a drilling pipe at a position deviated by d 'distance from a borehole;
FIG. 13 is a view showing a state in which a ship equipped with a fixed structure of a drilling pipe of the present invention is drilled in a subsea oil field using a drilling pipe in an inclined state. 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.

The fixed structure of the drilling pipe according to the first embodiment of the present invention (hereinafter referred to as 'fixed structure' for convenience of description) is shown in Figure 4, the oil field (5) located on the seabed (3) ) To be applied to a drill ship for drilling crude oil or gas by installing a pipe for drilling. By the way, the present invention is not limited to that applied to the drill ship, any of the structures using a drilling pipe for drilling the oil of the seabed in the sea, such as a drilling platform is applicable.

Drillship 10 is formed in the vertical direction of the hull, a moonpool 30 is formed so that the bottom side is in communication with the sea surface is formed, the drilling pipe 20 for drilling of the seabed surface through the moonpool 30 ) Can be installed.

In addition, a derrick 40 may be provided on the upper side of the door pool 30 to continuously install the drilling pipe 20.

As shown in FIG. 5, the fixing structure of the drilling pipe according to the present exemplary embodiment may include the first plate 112 and the second plate 122.

The first plate 112 has a first axis 114 in the horizontal direction as a rotation axis, and is provided rotatably about the first axis 114 with respect to the hull 10, the opening ( 116 is a component formed.

In this case, the horizontal direction may mean a horizontal direction of the hull 10, it may be installed on the upper side of the door pool 30 or may be installed inside the door pool 30. In addition, the hull 10 to which the first shaft 114 is coupled or provided may be coupled to various parts of the hull, such as a deck (deck) or a wall forming the door pool 30.

In addition, the second plate 122 has a second axis 124 in the direction of orthogonal to the first axis 114 as a rotation axis, and the opening 116 formed in the first plate 112 is located in the second axis 124. It may be provided to be rotatable about the second axis (124). The second plate 122 may be formed to have a smaller size than the opening 116 in order to be rotatably coupled to the opening 116.

That is, the second plate 122 is rotated by the rotation about the first axis 114 of the first plate 112, and the second axis 124 orthogonal to the first axis 114. It is provided to be able to rotate independently around.

In addition, a drilling pipe 20 may be fixed to a center portion of the second plate 122. In addition, the second plate 122 may be provided with drilling equipment 50 to fix the drilling pipe 20 or to drive the drilling pipe 20.

In FIG. 5 of the present embodiment, the first plate 112 and the second plate 122 are disclosed to have a circular shape. As shown in FIG. 6, the first plate 113 and the second plate 123 are illustrated. ) May be formed in a square. Of course, the first plate and the second play is not limited by the form thereof, and other forms may be possible as long as they can rotate freely. In the following description, the first plate and the second plate will be described as having a circular shape as an example.

On the other hand, any one of the first shaft 114 or the second shaft 124 may be made to face the longitudinal direction of the hull. As described with reference to Figure 2, the ship is subjected to the rolling (rolling) to shake the longitudinal direction of the hull in the axis of the hull and the pitching movement to shake in the direction orthogonal to the longitudinal direction under the influence of waves and wind, When one of the first shaft 114 or the second shaft 124 faces the longitudinal direction of the hull, the rotational direction of the first plate 112 and the second plate 122 is a rolling motion and pitching of the vessel. Can match the direction of movement. Of course, the present invention is not necessarily limited thereto, and the first shaft 114 or the second shaft 124 may be formed to face a direction irrespective of the longitudinal direction of the hull.

Thus, for example, when the vessel 10 is spaced from the borehole 7 or when the drilling pipe 20 receives a force to be inclined with respect to the vessel as the vessel 10 is inclined, the first plate ( 112 and the second plate 122 may rotate to incline the drilling pipe 20 in the corresponding direction.

Hereinafter, the fixing structure of the drilling pipe according to the second embodiment of the present invention.

As shown in FIG. 7, the fixing structure according to the present embodiment may include a first plate 112, a second plate 122, and a restoration unit 140.

The first plate 112 and the second plate 122 are the same as the above-described embodiment, hereinafter, the configuration in which the first plate 112 and the second plate 122 is coupled to the fixed deck 130 It will be called.

The restoration unit 140 is at least one of the first plate 112 or the second plate 122 so that the first plate 112 and the second plate 122 of the fixed deck 130 is restored to a horizontal state. It is a component that exerts resilience to one. That is, as the first plate 112 and the second plate 122 are restored to a horizontal state, the drilling pipe 20 may also be restored in a direction perpendicular to the hull.

The restoration unit 140 as described above may include the frame 150 and the spring 160.

The frame 150 is fixed to the hull and may extend to the upper side of the first plate 112 and the second plate 122. Since the fixed deck 130 may be formed in the door pool 30, the frame 150 may also be formed above the door pool 30. In addition, the frame 150 may be configured such that a part of the aforementioned derrick 40 performs the role of the frame 150.

As shown in FIGS. 7A and 7B, one end of the spring 160 is supported by the frame 150, and the other end of the spring 160 is concentrically coupled with the rotation center of the second plate 122. The second plate 122 is deformed to be bent in accordance with the rotation of the 112 and the second plate 122, and when the external force applied to the drilling pipe disappears or decreases, the second plate 122 is restored by the elastic force of the spring 160. It can be made to restore to a horizontal state. When the second plate 122 is restored to a horizontal state, the first plate 112 connected by the second shaft 124 may also be restored to a horizontal state.

In FIG. 7, the spring 160 is coupled to the upper side of the drilling rig 50 provided in the second plate 122, but the present invention is not necessarily limited thereto, and may be combined in other forms. Do.

At this time, the spring 160 may be a tension coil spring. The load of the drilling pipe 20 is applied to the first plate 112 and the second plate 122, in which an excessive load may be applied to the first shaft 114 and the second shaft 124. At this time, when the tension coil spring is applied to the spring 160, at least a part of the load acting on the first shaft 114 of the first plate 112 and the second shaft 124 of the second plate 122 is applied. The load applied to the first shaft 114 and the second shaft 124 may be reduced by being distributed to the frame 150. Accordingly, the first shaft 114 and the second shaft 124 may be reduced. It may be possible to prevent damage or prolong the life, and the first plate 112 and the second plate 122 may be rotated smoothly.

In addition, in the event that the first shaft 114 or the second shaft 124 is damaged, the spring 160 supports the load of the fixed deck 130 and the drilling pipe 20 so that the drilling pipe 20 Can prevent accidents falling from the hull.

Hereinafter, the fixing structure of the drilling pipe according to the third embodiment of the present invention.

As shown in FIG. 8A, the fixing structure according to the present embodiment may include a first plate 112, a second plate 122, and a restoration unit 140.

The first plate 112 and the second plate 122 are the same as in the above-described embodiment, and the restoration unit 140 may include a frame 150 and a plurality of springs 170.

The frame 150 is also the same as the frame of the above-described embodiment, the description of this embodiment will be described with respect to the spring 170 that is different from the above-described embodiment.

Although the spring 160 of the above-described embodiment is concentrically coupled with the rotational center point of the second plate 122, as shown in FIG. 8B, the spring 170 of the present embodiment is provided in plural numbers, and each spring 170 is provided. The second plate 122 may be coupled to different points.

In this embodiment, it is disclosed that the spring 170 is provided with three, but the present invention is not limited by the number of the spring.

At this time, the points 126 to which the respective springs 170 of the second plate 122 are coupled are positioned at equidistant distances from the rotational center point c of the second plate 122, respectively, and the springs are coupled to each other. Points 126 may be made to be equal to each other. Of course, the present invention is not limited thereto, and the second plate 122 may be formed in any form as long as the force is balanced in a horizontal state by the elastic force of each spring 170.

Therefore, when the ship is inclined or moved to generate an external force to incline the drilling pipe 20, the first plate 112 and the second plate 122 rotates in the corresponding direction, the first plate ( Each spring 170 is deformed as the spring 170 is extended or contracted as the 112 and the second plate 122 rotate. When the external force applied to the drilling pipe 20 disappears or decreases, the spring 170 is applied to the elastic force. The first plate 112 and the second plate 122 may be returned to the horizontal state while being restored to the original state.

At this time, the spring 170 may be applied to the tension coil spring as described above, the present invention is not necessarily limited thereto.

Hereinafter, the fixing structure of the drilling pipe according to the fourth embodiment of the present invention.

As shown in FIG. 9A, the fixing structure according to the present embodiment may include the first plate 112, the second plate 122, and the restoration unit 140.

The first plate 112 and the second plate 122 are the same as in the above-described embodiment, and the restoration unit 140 includes a frame 150, a plurality of winches 182, and a cable 184. Can be.

The frame is also the same as the frame 150 of the above-described embodiment, the description of this embodiment will be described with respect to the winch 182 and the cable 184 different from the above-described embodiment.

The winch 182 may be provided in plural in the frame 150. In the present embodiment will be described taking an example provided with three.

In addition, the cable 184 may also be provided with three to correspond to the number of the winch 182, one end of each cable 184 is coupled to different points of the second plate 122, the other end Is wound around each winch 182 and wound or unwound on the winch 182 according to the rotation of each winch 182 to restore the first plate 112 and the second plate 122 to a horizontal state. It can be made to.

Of course, the present invention is not limited to the number of the winch 182 and the cable 184, it may be installed in fewer or more than three.

In this case, as shown in FIG. 9B, the points 128 at which the cable 184 is coupled to the second plate 122 are respectively equidistant from the center of rotation c of the second plate 122. Although the present invention is not limited thereto, the second plate 122 may be coupled to any point if the second plate 122 may be in a horizontal state by the tension of each cable.

That is, usually, the drilling pipe 20 is inclined to loosen each cable 184 to allow the first plate 112 and the second plate 122 to be rotated, and the fixed deck 130 and When the drilling pipe 20 is to be returned to its original state, at least a portion of the cable 184 may be wound to restore the first plate 112 and the second plate 122 to a horizontal state.

In addition, the restoring unit 140 of the present embodiment may be used for restoring the horizontal state of the first plate 112 and the second plate 122, and may also be used to intentionally tilt the drilling pipe 20. FIG. have.

That is, if necessary, at least some of the plurality of cables 184 may be wound to intentionally tilt the first plate 112 or the second plate 122 and the drilling pipe 20.

Hereinafter, the fixing structure of the drilling pipe according to the fifth embodiment of the present invention.

10 and 11, the fixing structure according to the present embodiment may include a first plate 112, a second plate 122, and a restoration unit.

The first plate 112 and the second plate 122 are the same as in the above-described embodiment, and the restoration unit may include a spiral spring 192.

The spiral spring 192 may be provided on the first shaft 114 of the first plate 112 and the second shaft 124 of the second plate 122, respectively.

As shown in FIG. 11, the spiral spring 192 is formed in a round shape, such as a spring, and as shown in FIG. 11A, rotation of the first plate 112 or the second plate 122 is performed. When deformed while drying, and the external force applied to the first plate 112 and the second plate 122 disappears or is reduced, as shown in FIG. 11B, the first plate is restored to an initial state by an elastic force. 112 or the second plate 122 may be restored to a horizontal state.

In more detail, when the first shaft 114 is rotatably coupled to the hull while rotating with the first plate 112, the spiral spring 192 provided on the first shaft 114 One end is fixed to the first shaft 114 that is rotated together with the first plate 112, the other end is fixed to the hull 10 for rotatably supporting the first shaft 114, the first plate It can be made to elastically deform by the rotation of (112). Of course, when the first shaft 114 is fixed to the hull 10 and rotatably coupled to the first plate 112, one end of the spiral spring 192 is the outer peripheral surface of the first shaft 114 It is fixed to the other end may be coupled to the first plate (112).

Similarly, when the second shaft 124 rotates with the second plate 122 and is rotatably coupled to the first plate 112, the spiral spring 192 provided on the second shaft 124. One end is fixed to the second plate 122, the other end is fixed to the first plate 112 may be made to elastically deform by the rotation of the second plate (122). Of course, when the second shaft 124 is fixed to the first plate 112 and rotatably coupled to the second plate 122, one end of the spiral spring 192 is connected to the second shaft 124. It is fixed to the outer peripheral surface of the other end may be coupled to the second plate (122).

Accordingly, in the ship 10 to which the fixed structure of the drilling pipe according to the above embodiments is applied, as shown in FIG. 12, even if the ship 10 is spaced apart from the borehole 7, the fixed deck 130 is By inclining toward the borehole 7 side, the stress applied to the drilling pipe 20 can be reduced to a minimum, whereby a range d 'that can be spaced apart from the workable borehole 7 of the vessel 10 is provided. Can increase.

In addition, as shown in FIG. 13, even when the vessel 10 is inclined by the influence of waves, the fixed deck 130 is inclined toward the borehole 7 to minimize the stress applied to the drilling pipe 20. It can be reduced, and thus the workable slope of the vessel 10 can be increased.

In addition, when the vessel 10 approaches the borehole 7 and the distance from the borehole 7 decreases, or the inclination of the vessel 10 decreases, the fixed deck ( 130 and the drilling pipe 20 may be restored to an initial state.

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

3: bottom 5: oilfield
7: borehole 10: ship, hull
15: where the drilling pipe is coupled to the hull
20: drilling pipe 30: door pool
40: Derrick 50: Drilling Rig
100: fixed structure 112, 113: first plate
114: first axis 116: opening
122 and 123: second plate 124: second axis
126: spring coupling point 128: cable coupling point
130: fixed deck 140: restoring unit
150: frame 160: spring
170: spring 182: winch
184: cable 192: spiral spring
c: center of rotation of the second plate

Claims (8)

A first plate having a first axis facing in a horizontal direction, the first plate being rotatable about the first axis with respect to the hull and having an opening formed therein; And
It has a second axis facing the direction orthogonal to the first axis as a rotation axis, provided in the opening of the first plate rotatably around the second axis, and installed in the door pool formed to penetrate the hull in the vertical direction A second plate to which the drilling pipe is fixed; And
And a restoring unit configured to apply a restoring force to at least one of the first plate and the second plate such that the first plate and the second plate are restored to a horizontal state.
The restoration unit,
A frame fixed to the hull and extending upwardly of the first plate and the second plate; And
One end is supported by the frame, the other end is coupled to the second plate and deformed according to the rotation of the first plate and the second plate, and restored by the elastic force to restore the first plate and the second plate to a horizontal state. Including springs,
And the spring is a tension coil spring for distributing at least a portion of the load applied to the first plate or the second plate to the frame. The method of claim 1,
Any one of the first axis or the second axis,
Fixed structure of the drilling pipe provided to face the longitudinal direction of the hull. delete delete The method of claim 1,
The spring is a fixed structure of the drilling pipe is provided with a plurality.
delete A first plate having a first axis facing in a horizontal direction, the first plate being rotatable about the first axis with respect to the hull and having an opening formed therein; And
It has a second axis facing the direction orthogonal to the first axis as a rotation axis, provided in the opening of the first plate rotatably around the second axis, and installed in the door pool formed to penetrate the hull in the vertical direction A second plate to which the drilling pipe is fixed; And
And a restoring unit configured to apply a restoring force to at least one of the first plate and the second plate such that the first plate and the second plate are restored to a horizontal state.
The restoration unit,
A frame fixed to the hull and extending upwardly of the first plate and the second plate;
A plurality of winches provided in the frame; And
One end is coupled to different points of the second plate, the other end is wound around each of the winch is wound around the winch in accordance with the rotation of each winch or a plurality of adjusting the inclination of the first plate and the second plate Cables;
Fixed structure of the drilling pipe comprising a. delete

Images