JP3378963B2 - Tilt-free drilling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilting type drilling device for drilling a submarine ground from above water.

[0002]

2. Description of the Related Art Conventionally, tilting type drilling devices of this type are
A casing pipe in which the borehole rod is inserted is housed vertically, and a guide pipe that is erected vertically on the water bottom and a hydraulic cylinder for raising and lowering that is erected on the mounting base at the top of the guide pipe are provided so that it can be raised and lowered. a hydraulic swivel head for rotation, said mounted on the guide pipe work barge is moored in the vicinity of, placing the scaffold for hanging the hydraulic unit and the drilling rod to drive the hydraulic cylinder and swivel head above elevation It has a pedestal, and by connecting the hydraulic unit to the lifting hydraulic cylinder and swivel head with a hydraulic hose, the work platform can move up and down due to tidal flow, and the work platform can be pitched and rolled due to tidal currents or wind waves. It is configured to drive smoothly regardless of shaking.

[0003]

However, in the conventional tilting type drilling device described above, the pedestal is configured in multiple stages in order to cope with the vertical movement of the work pontoon due to tidal conditions and to facilitate the work. At the time of high tide, there was a drawback that the tidal range was large and it was difficult to work. Therefore, an object of the present invention is to provide a tiltable drilling device that can perform work efficiently and safely regardless of the vertical movement of a work pontoon due to tidal conditions.

[0004]

In order to solve the above-mentioned problems, a first tiltable drilling device of the present invention accommodates a casing pipe into which a drilling rod is inserted, and is vertically installed on a water bottom. A pipe, a hydraulic swivel head that rotates up and down by a lifting hydraulic cylinder that is erected on the mounting base of the top end of the guide pipe, and that rotates the drilling rod, and a work platform moored near the guide pipe. It mounted in tiltable type drilling device having a main hydraulic unit and frame placing the derrick for hanging the drilling rod to drive the hydraulic cylinder and swivel head above elevation, top end of the casing pipe and the guide pipe The expansion and contraction parts that are respectively expandable and contractible in the axial direction, and the expansion and contraction hydraulic cylinder that operates the expansion and contraction part of the guide pipe, A sub-hydraulic unit that is mounted on a gantry and drives the above-mentioned hydraulic cylinder for expansion and contraction, and the space between the mounting base and the water surface becomes constant according to the vertical movement of the water surface detected by a pressure sensor placed under the water surface. And a control device for controlling the sub hydraulic unit. A second tiltable drilling apparatus is the same as the first tiltable drilling apparatus, and is mounted on the work table boat.
It is provided with a float on which the gantry is placed, and horizontal holding means for horizontally holding the float.

[0005]

In the first means, the mounting base of the top end of the guide pipe moves up and down in accordance with the vertical movement of the working pontoon due to the ebb and flow, and the position of the mount base of the working pontoon and the mounting base of the top end of the guide pipe. Relationships are always constant. Further, in the second means, in addition to the operation of the first means, the gantry is always held horizontally regardless of the shaking of the work platform ship. As the expandable part of the top end of the casing pipe and the guide pipe,
A bellows or the like, which is composed of an inner cylinder and an outer cylinder, which are slidably fitted in the axial direction, is used. Further, as the horizontal holding means of the float, a water tank provided on the work pontoon for floating the float and a connecting material such as a spring or laminated rubber that elastically connects the float floated on the water tank to the work pontoon Or a water tank that is provided vertically through the work table to float the float.
A two-axis gimbal that supports a float floated in this water tank on a work table in a swingable manner, a balance weight that is hung vertically under the float, and others are used.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a tiltable drilling device according to an embodiment of the present invention. In the figure, reference numeral 1 is a guide pipe accommodating a casing pipe 3 into which a borehole rod 2 is inserted, which is vertically installed on a water bottom 7 by a fixing device 4, a plurality of anchor wires 5 and anchors 6 attached to the lower end thereof. ing. As shown in detail in FIG. 2, the top end portion of the guide pipe 1 is provided with a telescopic portion by adopting a double structure in which a guide pipe 101 having a smaller diameter than the lower end portion is slidably inserted. The expansion / contraction portion is arranged around it, one end of which is pivotally attached to a mounting base 8 attached to the top end of a small-diameter guide pipe 101, and the other end is attached to the outside of the large-diameter guide pipe 1. The plurality of hydraulic cylinders 10 for expansion and contraction pivotally attached to the bracket 9 are synchronously operated so as to be expandable and contractable in the axial direction.

Each expansion / contraction hydraulic cylinder 10 is driven by a sub-hydraulic unit 11 mounted on a frame as described later, and both are appropriately connected by a flexible hydraulic hose 12. Then, the sub-hydraulic unit 11 is controlled by the control device 13 mounted on the pedestal so that the water surface 1 in the large-diameter guide pipe 1 is controlled.
4, the operation is controlled continuously or intermittently so that the distance between the mounting base 8 and the water surface 14 becomes constant according to the vertical movement of the water surface 14 detected by the pressure sensor 15 mounted on the outer side below. The control device 13, the sub-hydraulic unit 11, and the pressure sensor 15 are connected to the signal line 1 respectively.
6 and 17 are connected.

The expansion and contraction portion of the top end of the guide pipe 1 is not limited to the case where the guide pipe 101 is slidably fitted in the top end of the guide pipe 1 so as to have a double structure. A guide pipe having a larger diameter than the guide pipe 1 may be slidably fitted in a double structure, or a bellows may be provided in a watertight manner at the top end of the guide pipe 1. On the other hand, the top end portion of the casing pipe 3 is also provided with a stretchable portion similar to the top end portion of the guide pipe 1. The pressure sensor 15 is not limited to being attached to the outside of the water surface 14 of the guide pipe 1, but may be attached to, for example, the lower end portion of the rod hanging on the attachment base 8 and arranged below the water surface 14.

As detailed in FIGS. 2 and 3, a work platform 18 is attached to the mounting base 8 so as to project outward, while two lifting hydraulic cylinders 19 are provided on the support frame. It stands upright through 20. A hydraulic swivel head 21 for rotating the drilling rod 2 is attached to both the lifting hydraulic cylinders 19 through guide cylinders 211 slidably fitted in the respective cylinder bodies 191, and the respective piston rods. It is connected through a plurality of connecting rods 23 to a connecting plate 22 that connects the upper end portion of 192, and a hydraulic swivel head 21 is provided so as to be able to move up and down by operating both lifting hydraulic cylinders 19 in synchronization. Both lifting hydraulic cylinder 19 and hydraulic swivel head 21
Is driven by a main hydraulic unit mounted on a frame as described later, and both are connected to the main hydraulic unit by flexible hydraulic hoses 24 and 25, respectively.

On the other hand, on the work table 26 moored near the guide pipe 1, as shown in FIGS. 1, 4 and 5,
A water tank 27 is provided, and the water tank 27 has a pedestal 2
Float 29 carrying 8 is floating. Aquarium 2
7 and float 29 are work pontoons 2 due to tidal currents or wind waves
The float 29 is elastically connected to the work pontoon 26 at a plurality of points by a connecting member 30 such as a spring or laminated rubber, in order to prevent swaying such as pitching and rolling of 6 from reaching the gantry 28. There is. On the gantry 28, a main hydraulic unit 31 for driving the lifting hydraulic cylinder 19 and the swivel head 21 and a four-legged turret 32 for suspending the pilot rod 2 are placed, and the pilot rod 2 is connected to the wire 33. A hoist 34, which is suspended via the, is mounted side by side with the main hydraulic unit 31.
A sub hydraulic unit 11 for driving the hydraulic cylinder 10 for expansion and contraction and a control device 13 for the sub hydraulic unit 10 are mounted on the gantry 28, and a drill pump 36 for pumping water to the drill rod 2 through a flexible hose 35. Is placed.

As a horizontal holding means for the float 29, a water tank 27 and a connecting member 30 provided on the work platform 26 are provided.
6 and 7, for example, a water tank 271 vertically penetrating the work table 26, and a float 291 floated on the water tank 271.
Biaxial gimbal 37 for swingably supporting the work table boat 26
Alternatively, the balance weight 38 may be provided vertically below the float 291.

[0012]

As described above, according to the first tiltable drilling device of the present invention, the mounting base of the top end of the guide pipe moves up and down in accordance with the up and down movement of the work pontoon due to the ebb and flow. Since the positional relationship between the platform of the work pontoon and the mounting base of the top end of the guide pipe is always constant, it is not necessary to move up and down the multi-stage pedestal as the work pontoon moves up and down due to tidal conditions, thus improving work efficiency You can do it well and safely.
Further, according to the second tiltable drilling apparatus, in addition to the effect of the first one, the gantry is always held horizontally regardless of the shaking of the work pontoon, so that the working accuracy can be further enhanced. At the same time, it is possible to prevent damage and the like due to the contact between the devices.

[Brief description of drawings]

FIG. 1 is a side sectional view of a tiltable drilling device according to an embodiment of the present invention.

FIG. 2 is a side view of a guide pipe and a swivel head of the tiltable drilling device shown in FIG.

3 is a front view of a swivel head of the tiltable drilling device shown in FIG. 1. FIG.

FIG. 4 is a front sectional view of a work pontoon of the tiltable drilling device shown in FIG.

5 is a plan view of a work pontoon of the tiltable drilling device shown in FIG. 1. FIG.

FIG. 6 is a front sectional view of another embodiment of the work pontoon of the tilting type boring device shown in FIG. 1.

FIG. 7 is a plan view of another embodiment of the work pontoon of the tilting type boring device shown in FIG.

[Explanation of symbols]

1 Guide pipe 2 drilling rod 3 casing pipe 7 bottom 8 mounting base 10 Telescopic hydraulic cylinder 11 Sub hydraulic unit 13 Control device 14 Water surface 15 Pressure sensor 19 Lifting hydraulic cylinder 21 hydraulic swivel head 26 Work pontoons 27 aquarium 28 mounts 29 float 30 connecting material 31 Main hydraulic unit 32 tower 37 biaxial gimbal 38 Balance Weight 101 Small diameter guide pipe 271 aquarium 291 float

Claims (2)

(57) [Claims] 1. A guide pipe which houses a casing pipe into which a drilling rod is inserted and which stands upright on a water bottom,
A hydraulic swivel head that rotates up and down the drill rod and is installed on a work berth moored in the vicinity of the guide pipe. in tiltable type drilling device having a main hydraulic unit and frame placing the derrick for hanging the drilling rod to drive the hydraulic cylinder and swivel head above elevation, respectively on the top end portion of the casing pipe and the guide pipe An elastic part that can be expanded and contracted in the axial direction, an expansion and contraction hydraulic cylinder that expands and contracts the expansion and contraction part of the guide pipe, a sub-hydraulic unit that is mounted on the frame and that drives the expansion and contraction hydraulic cylinder, and below the surface of the water. Depending on the vertical movement of the water surface detected by the pressure sensor arranged, the space between the mounting base and the water surface becomes uniform. Tiltable type drilling apparatus, characterized in that it comprises a control device for controlling the sub-hydraulic unit to be. 2. The tiltable drilling device according to claim 1, further comprising a float mounted on the work pontoon, on which the gantry is mounted, and horizontal holding means for horizontally holding the float.