SU1477835A1 - Arrangement for testing the hydroacoustic positioning system of floating drilling rig - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic engineering. The purpose of the invention is to reduce the time and laboriousness of work when testing the sonar positioning system. The device contains a winch, connected by ropes with an underwater support base 5, on which the frame 7 is located with the transmitting sonar sensor. The support base 5 is made with a hole 6 through which a length of pipe 18 is passed. The upper part of a length of pipe 18 is rigidly connected to the walls of aperture 6. The lower part of a length of pipe 18 protrudes beyond the base. In order to carry out work on testing the hydroacoustic positioning system, the underwater support base 5 is lowered to the bottom before plunging a length of pipe 18 into the bottom. 1 hp f-ly, 1 ill.

Description

The invention relates to a hydraulic construction, in particular, to devices for launching and testing a hydro-acoustic system for positioning floating drilling rigs.

The aim of the invention is to reduce the time and complexity of work during testing.

The drawing shows a device for testing a hydroacoustic positioning system for a floating drilling rig.

A device for testing a hydroacoustic positioning system, mounted on a drilling rig 1, contains a traveling block 2 with a compensator 3 vertical movements, a drill string 4, a submerged support base 5 with an aperture 6, a frame 7 with a transmitting sonar sensor 8, a direction ropes 9 with tensioners 10 and, winches 11 of the subsea wellhead equipment used to descend frame 7, winch 12 with cable-cable 13 with compensator 14 for lowering the frame and powering the sensor 8, hydroacoustic receivers 15 mounted on a floating drilling rig 1, a television control unit (camera) 16 for checking a pointer, which uses a horizontally horizontal level sensor 17 for a mounting underwater base 5. A section of pipe 18 is passed through the aperture 6 of the underwater base 5, sufficient to sink into the sea muddy bottom under the influence of its gravity. Underwater support base 5 is provided with an adapter 19.

Preparing the device for operation is as follows. I

Floating drill installation 1 becomes on the core to a point in the sea, the depth of which is not less than the minimum allowable for the mutual positioning of the sensors of the acoustic positioning system (at least 80 m). An underwater support base with attached guide ropes 9 and an installed level sensor 17 is lowered onto the drill string 4 at the bottom of the track block 2 onto the seabed. In this case, the compensator 3 vertical movements is connected to the

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bot when building the last pipe to the drill string 4 and only compensates for the weight of the drill string. The guide ropes 9 freely release the winches 11. The descent is stopped when a piece of pipe 18 is stuck into the seabed and this moment is determined by the weight gauge of the pulley system when the weight of 12 ... 15 tons of the underwater base 5 is removed from the weight sensor. Guide ropes 9 (a total of four ropes) are tensioned by a force of 2 tons each simultaneously with the help of a tensioner of inhabitants 10 and winches 11.

To check the horizontal position of the underwater support base, the sensor 17 is lowered by the camera 16 along the guide ropes 9. Then the frame 7 is lowered with the transmitting sonar sensor 8 via cable 13 by the winch 12 along the guide ropes 9 all the way into the underwater base 5, which can be seen the camera 16 and the lowering of the load of the compensator 14. The signals are fed remotely from the console through the cable-cable 13 by the sensor 8 to the receivers 15 and the con-. Trolling on the remote. In this position, the sensor 8 corresponds to the position O of the floating drilling rig above the well, and displacing the sensor 8 across the horizontal frame frame to other discrete positions tare the indicating devices of the sonar positioning system as a percentage of the sea depth.

Example. The length of the pipe section is taken in the order of 11 mm to be buried vertically in the sea muddy bottom under the action of gravity and to ensure installation of the acoustic sensor vertically above the sea bottom at a height similar to that of a regular underwater unit. The upper end of the pipe section protrudes over the subsea support base approximately the diameter of the pipe section so that it can be firmly fixed by known methods, for example, by welding or on bolts. The application of the invention allows refusing the drilling of a well and installing a preventer assembly, which reduces the time and laboriousness of the test of the sonar positioning system.

3 14778354

Claims (2)

The invention formula of the time and laboriousness of the work during the tests, it is equipped with a pipe cut. A device for testing a guide placed in the hole in the acoustic system of the positioning base, and its upper vanilla floating drilling rig, the end is rigidly connected to the walls containing winch, connected ka-hole, and the bottom stands for with an underwater support base — the limits of the base, on which the frame is located with sonar transmitter-JQ 2. The device according to claim 1, about tl and h akom, in this case, in the basis of the fulfillment of the underwater but the hole, characterized by a supporting base, is provided with a wearer in order to shorten the body.