SU1520459A1 - Arrangement for tugging seismograph sand bars - Google Patents

Abstract

The device for towing a seismograph spit belongs to the field of marine seismic exploration, namely, seismic exploration in waters with ice cover. The purpose of the invention is to increase the productivity of work by increasing the mechanical reliability of the input cable and the seismograph spit during operation in the sea with ice cover. Supply of the device with a casing made in the form of a hollow cylinder and a seismograph spit covering with a gap provides protection for the cable and seismic equipment section when setting up, towing and sampling the spit. Providing the device with a carriage pivotally connected to the vessel-tug and a movable support increases the productivity of the preparatory work. 1 hp f-ly, 4 ill.

Description

The invention relates to the field of marine seismic exploration, specifically to devices for towing seismic equipment during seismic exploration in waters with ice cover.

The purpose of the invention is to increase the performance of seismic exploration by increasing the mechanical reliability of the input cable and the seismograph spit during operation in the sea with ice cover.

FIG. 1 shows the device in the working position; the general view in FIG. 2 shows a bell with an end body located in it, a general view} in FIG. 3 - the constructive scheme of the carriage -. FIG. 4 - device in the stowed position, general view.

In working condition (Fig. 1), the device for towing a seismograph spit is a vessel-tug 1 with a seismic winch 2, a protective casing 3 inside which is located an input cable 4, to which are connected, sections of a seismograph spit 5 including end body 6 The input cable 4 at the root end is wound on a seismic winch 2 mounted on the vessel-tow 1. The end body 6 is connected to sections of the seismograph spit 5 by the line 7. The protective casing 3 is equipped with a carriage 8 fixed on the platform 9 ate

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31520459

swivel means 10. i. The protective cover 3 comprises a burial wing 11, which provides the deepening of its running end. In order to carry out launching operations, the bell 12 of the running end of the protective cover 3 is made so that its inner surface mates with the peripheral surface of the terminal body (Fig. 2). | Q

In working condition, the position of the protective cover 3 relative to the carriage 8 is fixed by the limiter 13 of the movement of the cover. 3 with respect to the carriage 8, which abuts against the end surface of the latter. A releasable latch in the form of a pin 14 is mounted on the root end of the protective casing 3 between the socket 15 of the root end of the casing 3 and the stop 13. 20

Fixing the position of the protective casing 3 in the working position relative to the vessel-tug 1 is carried out by the latch 16 (Fig. 3). Between the carriage 8 and the seismic winch 2 on the deck 25 of the tug boat 1 there is a movable support 17 (Fig. 4). Platform 9 provides wife with support rollers 18, which c. the working position is installed in the directions 19, attached to the paired side of the vessel-tug 1 to reduce the resistance to movement of the casing 3 in the carriage 8 can be installed, for example, the roll bars 20. A limiter 21 is mounted on the running end of the casing. the traveling position, the support 17 and the platform 9 are provided with bows 22 and 23, respectively.

The device works as follows .40

Before setting up a streamer in a protective casing 3, a sling 7 is placed, at one end attached to an end body 6 installed in the bell 12 of the travel end of the casing 3, dZ and the other end of the sling 7 attached to the section of the seismograph spit 5. The running end of the casing 3 is placed in the carriage 8 and the root end on the movable support 17, where the pin JQ rem 14 of the housing 3 is held.

The installation of the device for towing a seismograph spit begins with the movement of the casing 3 along the deck of the tugboat 1 on the rollers 18 of the carriage 8 and its movable support 17 to the position at which the rollers 18 of the platform 9 are mounted and fixed in the guides 19. Next, the movement of the movable support.

The keys 17 in the direction of the carriage 8 through the pin 14 provide the movement of the casing 3 relative to the carriage 8. When the casing 3 is moved, the sling 7 is etched so that the sling is constantly under a slight tension. When the center of gravity of the casing 3 is moved beyond the axis of the hinge 10 of the carriage 8, the casing 3 inclines, the pin 14 leaves the engagement with the slide. The support 17 and the strap 7 are tightened by the weight of the casing 3, which is transmitted to the sling 7 through the end body 6 located in the socket 12 of the suspension end of the casing 3.

Bleeding the sling 7 from the seismic winch 2 further moves the casing 3 relative to the carriage 8 to a position in which the stopper 13 abuts against the end surface of the carriage 8. When towing, the buoyer wing 11 generates a force ensuring the required angle of inclination of the casing 3 relative to the vessel-tug 1 which is fixed by latch 16 (FIG. 3),

Further venting of the sling 7 provides for the outlet of the socket 12 of the end body 6, which is under the influence of the hydrodynamic force of the incident flow of liquid, and the placement of the end body 6 along the flow. Sling 7 pulls through the casing of 3 sections of the seismograph spit while bleeding them from the seismic winch 2. The smoothness of the exit and entrance of the sections of the seismograph spit 5 from the casing 3 is provided with sockets .12 and 15. After the bushing of the necessary length of the sections of the seismograph spit in the casing 3 is placed, cable 4 is placed Input, providing mechanical and electrical connection of the onboard equipment of the vessel with sections of the seismograph spit placed along the fluid flow behind the bell 12 of the suspension end of the casing 3. After that, the device is ready for th seismic exploration.

At the end of the seismic survey, the sampling device ds of the towing of the seismograph spit is sampled in the reverse order. Selecting successively the cable 4 of the input, the section of the seismograph spit and the line 7 on the seismic winch 2, the installation of the end body 6 in the socket 12 of the travel end of the casing 3 is carried out. Further selection of the line 7 on the seismic

FIG. 2

figl

Claims (2)

Formula and 1. The device smografic spit. I ^{6 a} tugboat with a seismic winch and an input cable to which a seismographic streamer is connected, including an end body, characterized in that, in order to increase the productivity of work by increasing the mechanical reliability of the input cable and the seismographic streamer when operating in seas with ice cover, the device is equipped with a protective casing made in the form of a hollow cylinder, covering the input cable and the seismographic streamer with a gap, and mounted on a carriage pivotally connected to the tugboat, while the casing contains stops its movement relative to the carriage and from the side of the running end is a deepening wing and a bell whose inner surface is mated to the outer surface of the end body, and the carriage is equipped with a casing position lock relative to the tugboat, and a movable support is placed between the carriage and the seismic winch on the deck of the tugboat , · And on the casing there is a detachable latch, mating with a movable support. 2. The device according to p. ^ Characterized in that the knot of the carriage with the tugboat is mounted on a platform equipped with track rollers installed in guides attached to the deck