SU906785A1 - Drilling ship - Google Patents

Description

(54) DRILLING VESSEL

one

The invention relates to the technical fleet and relates to the design of drilling vessels.

Known drill suiko, comprising a housing and a rotator with a drill string, hinged on the support 1.

The disadvantage of the well-known vessel is the difficulty of drilling during rough seas.

The purpose of the invention is to ensure sea ripping by placing the center of the hinge of the rotator in the sea at the center of the vessel’s swing.

This goal is achieved by the fact that the support is rigidly mounted on the hull foundation with the center of the rotator hinge located at a distance from the hull planes - diametral, main and mid-center, respectively, comprising 0-0,15 V, 0,5-1,5 T and 0-0,22 D, where B, T and D are the width, draft and length of the hull.

In addition, the rotator hinge is made in the form of a universal joint hinge consisting of two concentric rings with a common vertical axis, with a rotator on the inner ring and a central hole for the drill string, and the outer ring is hinged on the support.

FIG. 1 depicts a drilling vessel, a general view; in fig. 2 is a section A-A in FIG. I; in fig. 3 is a section BB in FIG. 2; in fig. 4 section BB in FIG. 2 (the vessel is in calm water without heel and trim); in fig. 5 is a sectional view BB in FIG. 2 (ship inclined).

FIG. 1 drilling vessel 1 is immersed at the operational waterline 2. Vessel 1 contains a rotator 3 fixed on the ship foundation 4, which in turn is mounted on a movable ring 5 of the hinge. The hinge is made by the type of cardan hinge. It contains two movable rings 5 and 6 fixed on supports 7. Rings 5 and 6 and supports 7 are connected by mutually perpendicular suspensions 8, so that the rotator 3 can deviate around center 9 in any direction.

Claims (2)

The supports 7 are rigidly fixed to the hull foundation 10 with the center 9 of the rotator hinge located at distances from the diametral, main and mid-tango body planes, respectively, being 0-0.15 V, 0.5-1.5 T and 0- 0.22 D, where B, T and D are the width, draft and length of the ship's hull along the waterline 2. For the passage of the drill string 11 through the hull of the ship 1, a shaft 12 is made in it. The drill string 11 is lifted from the well or din din - winch 13 installed on the plate This plate is mounted on braces 15 of the upper ring 16 of the drill cheeks 17. Winch 13 is connected to the swivel 18 of the drill string 11 by means of a rope 19. The latter is passed through element 20, which is connected by ropes 2 through guide blocks 22 and connected to power cylinders 23. The ship also has a system The working fluid is pumped into the hydraulic cylinders 23. The system includes the well-known hydraulic pumps, pneumohydroaccumulators and control valves (not shown) that move the element 20 by the hydraulic cylinders 23 so that the rope 19 when the vessel 1 oscillates in waves, all the time is kept above swivel 18 coaxially with drill string P. The system is controlled by a sensor 24, which can be mounted, for example, on the ship foundation 4, which retains its position (e (relative to the drill string 11) is not iment) 1 m when the vessel is rolling 1. The proposed vessel works in the following way. The vessel 1 enters the drilling point and is held there by using static or dynamic means of restraint (not shown). The drill pipes of the winch 13 alternately, through the rotator 3, are lowered into the shaft 2. When the drilling tool reaches the bottom of the sea, the rotator 3 begins to rotate, deepening the well. When drilling in calm water, when vessel 1 does not pump, waterline 2 retains its horizontal position, and drill column 11 has a vertical axis A. At that, element 20 uses hydraulic cylinders 23 to hold rope 19 also vertically along axis A. When drilling in rough seas, vessel 1 can bend in any direction. As an example, we consider the case of simultaneous on-board and longitudinal inclinations of the vessel 1 At the floor (waterline 2 takes position B in the transverse direction and B. in the longitudinal direction. If the vessel 1 is conditionally horizontal, we can pin down that the axis of the NOY column 11 drills G in the pot-neck direction and D in the longitudinal direction. The inclinations of the vessel occur around the center of the body of the waterline 2. By placing the center 9 of the hinge of the rotator 3 in close proximity to the specified center, t gesture the waterline 2 areas, mutual displacements of the vessel 1 and the drill string 11 will be vertical (due to vertical movements of the vessel 1 in waves and the need to feed the drill string 11 as the well deepens) and angles (due to the inclinations of the vessel 1 in rough seas). Vertical movements are taken into account the drilling method, commonly used on drilling ships, with a leading multi-sided section matched with a gap with the leading multi-sided sleeve of the rotator 3. With this method of drilling, the pressure on the bottom of the well. is carried out by the weight of the drill string 11. The angular movements are performed by rotating the rotator 3. With the tilt of the pedestal 4, the sensor 24 outputs a signal to the hydraulic cylinders control system 23. The latter moves the element 20 and the rope 19 passed through it to a position coaxial with the drill string 11. Thus, element 20 and rope 9 follow the position of the swivel 18 of the drill string 11, providing a coaxial attachment of the winch 13 to it. The drilling vessel can also be made in the form of a catamaran, which has The rotator p can be raised above the waterline 2. For this purpose ballast swaths can be used. Performing a drilling vessel will increase the limit values of sea and wind points, at which it can perform drilling operations from 2 and 3 points, respectively, to 4 and 6 points, which will increase the efficiency of the vessel by about 60% by reducing its downtime during adverse weather. Claim 1. A drilling vessel comprising a hull and a rotator with a drill string, secured on a support, characterized in that, in order to ensure sea ripping by placing the center of the rotator hinge in the center of the vessel’s swing, the support is rigidly mounted on corpus base with the placement of the center of the center vraishtol (m | distances from the corners of the body - diametral, main and mid-frame, respectively, which are 0-0.15 V, 0.5-1.5 T n 0-0.22 D where b, t n d - tsirina, sediment and body length court a. 2. The vessel according to claim 1, of which is that the rotator hinge is made in the form of a universal joint hinge -H concentric rings with a common vertical axis, whereby a rotator is mounted on the inner ring and a central hole for the drill string is made, and the outer ring is hinged on the support. Sources of information taken into account during the examination 1. USSR author's certificate N 407030, cl. B 63 B 35/44, 1972 (prototype). sixteen Fg / yy