A device for temporarily holding an offshore drilling rig in the arctic shelf
(57) Abstract:Usage: in hydraulic engineering, in particular, can be used in the construction of offshore drilling on the Arctic shelf. The inventive device for temporarily holding an offshore drilling rig in the Arctic in terms of the progress of the ice fields in the reference column placed piles. Each pile on the internal surfaces are made with hollow ribs, a portion of which is bypassed refrigerant, others lose fluid, and third - flush fluid. 1 C.p. f-crystals, 8 ill. The invention relates to hydraulic structures (artificial Islands), mainly to exploration and production offshore drilling units (MBU). With the greatest effect, it can be applied in the Arctic waters, which regularly operate heavy ice fields.In the world practice for many years we are searching for such structures MBU, who could resist the advances of the ice fields without interrupting the operational mode. Created, for example, reinforced concrete substructure MBU in the form of a truncated cone, so that when nadhani ledang the Ktsia in PCT patent N 86/06771 class. E 02 In 17/02, from 1986 or U.S. patent N 3952527, CL E 02 In 17/00, 1977.The disadvantage of such constructions is mainly their high cost of manufacture, since the construction of these enormous structures in Arctic conditions is very difficult.Also long ago developed the idea of a more simple design substructures, which would have a relatively low own weight, but nevertheless could withstand shear effort of moving ice field. For this purpose the lower part of the support base is supplied hammered into the bottom of the pile. For example, we can refer to such structures sea platforms for U.S. patent N 3811289, CL E 02 In 17/00 from 1974 or N 4784526, CL E 02 In 17/00, from 1988, Japan's bid N 58-19806, CL E 02 In 17/00, 1983, etc. In most cases hammered into the soil pile (often concrete) almost become sacrificial, as in the transition MBU at another point the waters of the said piles practically be extracted from the bottom is either not possible, or necessary for this complex (expensive) devices. In addition, the extraction of such piles from the ground takes a lot of time.In recent years considered is the creation of ice pillows.In the United States developed a technical solution (U.S. patent N 4187039, CL E 02 In 17/00 from 1980) to create an artificial ice island. To do this, using underwater caissons to form an annular volume of water within which washes the walls of the caissons outside freeze-known holoprotein equipment placed inside the mentioned caissons and formed their volume. The so formed frozen soil under the caissons increases the stability of the MBU.This known technical solution, obviously, can significantly improve the resistance MBU shift under the action of the ice fields, but there is a significant disadvantage from the point of view of manufacturing technology and production of structural elements. The fact that under the technical solution required to produce and deliver in Arctic waters special caissons. They should be equipped not only separate, stand-alone refrigeration units, and systems of immersion (ascent) with remote control authorities. Thus, the expected effect of unreasonably roads in achievement.Known technical solution for and.with. USSR N 1168665 Μl. E 02 In 17/02 from 1985 (prototype) concerning oporn the boron pipe sections, tightly connected to each other. Each section is provided with a heat exchanger (cooling unit), placed inside the partition.After you push the columns in the ground floor is the frosting around the mentioned sections of ice coats. At the same time is frozen and in contact with the sections of the soil, which leads to increased coupling sections with the ground.What is the main drawback of this seemingly very promising design. The fact that such a construction of the support columns is not acceptable in Arctic conditions, as it is not protected from the effects of a moving ice field.The objective of the invention is to provide such a construction of the supporting base MBU for a temporary hold on the Arctic shelf, which will be obtained reliably withstand the impact of a moving ice field; the maximum possible reduction of cost to manufacture the necessary supporting elements of design and their application in the process of setting MBU at the point of drilling and removing it for driving to another area and it's all due to the overlapping functions of the elements of the substructure, which in its composition it is necessary only to Podgornoe the basis of an offshore drilling unit (MBU) is made in the form of underwater Mat with at least one hollow support column, for example, a cylindrical shape, within which is placed movably piles with the opportunity to interact with the implementation mechanism at the top and a guiding device at the bottom, with each pile along its inner surface provided with hollow ribs, hydraulically connected with the reservoir for supplying fluid to the working environment.The problem is solved in that the first part of hollow ribs are made of a perforated and through its collector connected to the washing liquid.The problem is solved in that the second part of the ribs through its collector connected to the system coolant supply and the third part of them is connected via its collector to the system to lose fluid.The problem is solved by the fact that all piles are placed equidistant from each other on the inner forming surface of the supporting columns.The problem is solved in that the pile is provided with a nozzle for supplying it with compressed air and a discharge pipe pulp connected with the discharge pipe. The lower end of which is placed in the area of the collectors.In Fig. 1 gives a General view of the base of an offshore drilling rig; n section b-B of Fig. 3; Fig. 5 section b-b of Fig. 3; Fig. 6 type G Fig. 4; Fig. 7 type D Fig. 4; Fig. 8 - section E-E of Fig. 3.Support Foundation MBU contains installed on mate 1 columns 2, 3, along the inner surface of which is placed piles 4. Each pile along its inner surface provided with hollow ribs 5, 6, 7, United (grillage) corresponding collectors 8, 9, 10 with the pipes 11, 12, 13 of the supply of working fluid agents. Hollow ribs 6 (for feeding washing liquid) is made with the holes 14 of the perforation, and the ribs 7 are summed up and the washing liquid through the pipe 12. The pipe 13 to the inlet and outlet of the refrigerant to the ribs 5 is protected by a casing 15. All internal casing surface protected with insulating material 16.At the top of the piles installed pipes: 17 for supplying coolant 18
to supply wash water, 19 compressed air 20 from the discharge pipe 21 for removal of eroded soil. Piles pass through the routing device 22.To perform technological operations on development of certain waters of the Arctic basin on the bottom ground is established by known means Mat 1 (typically the structure MBU with technological equipment. The upper structure of this sentence is not the subject of the invention is widely and therefore not shown.Consider the technology of production of Mat 1 with the supporting column 2. It is hollow, mostly cylindrical design, through the Central part of which is held drilling tool (not shown). On the inner surface of the column 2 equidistant placed in the guiding device 22 is introduced into the soil ternoway 4. For the introduction of these piles, there are several types of mechanisms. This can be pile driving equipment or device for the push in the form of a rack-pinion mechanism or system traverse driven by hydraulic mechanisms. In this case, the device for the introduction of the 4 piles in the soil does not affect the subject matter of the invention and therefore not described in detail.For the implementation of the next pile, it is introduced in a known manner in interaction with the injection mechanism (push) and immersed in the soil. Upon reaching the design elevation of the injection mechanism is released from the pile and set on the following. At the end of the staging pile them perform operation on podsoednineny device ternoway 4 is so at the lowest cost in the manufacture of scarce metals its shell to get the maximum effect in operation. It is often necessary to ensure the strength of the metal replaced less scarce ribs that run in the form of semi-cylinders 5, 6, 7, welded to the inner surface of the piles 4 increments determined by calculation. In this part of the ribs, for example, 5 are designed for coolant supply part 6 for ozonation of water forming a slurry, and part 7 for the fluid.Work on introduction of piles is that when its gradual entry into the ground in the area of the face is served washing fluid through the manifold 9 and the corresponding ribs 7. To the resulting slurry would be more thin, through the manifold 10 and the ribs 6 may be served water through the holes 14. As further implementation of the 4 piles into the ground pulp is accumulated, rises up and spills out through the pipe 20. Depending on the properties of the soil may be that the water for ozonation is not required, then the corresponding collector and ribs may be idle.After the implementation of all 4 piles into the ground at the corresponding edges of jesenia resistance in the event of an impending ice fields.This increase resistance base from moving and tear-loads due to the following factors. As is known, the size of the columns in the cross-section of a few meters. Depth push the pile into the ground is more than 10 meters Distance between the piles OK. 1.0 m Thus, it is easy to imagine a lot of frozen soil, which prevents crowding of the platform under the action of the pressure of ice at the expense of the said mass of frozen soil. In addition, the area of frozen ground in the vertical plane is hundreds of square meters, which naturally prevents shifting efforts from the action of the ice field.To increase the bearing capacity (resistance to shear loads) certain plays an important role guiding device 22. It consists of a ring (see Fig. 8) with cells for passage of piles 4. Freezing of the soil and the pulp is slightly above the location of the sending device 22. In this case, the soil (pulp), frozen within 4 piles, and outside, becomes a monolith in the case of advances of the ice field shifting efforts from the piles 4 are transferred to the column 2 through n is of metal.For improving the operational efficiency of the system plays an important role in the removal of the pulp. The fact that the freezing of the entire column of slurry to the nozzle 20 is unprofitable due to the high cost of the refrigerant. Therefore, optimally, when the above guide device 22, the pulp will be removed. To do this, through pipe 19 (after the end of the process of freezing piles up to and slightly above the fixture 22) is supplied with compressed air. Through the discharge pipe 21 and the pipe 20 in the compressed air, the pulp is completely removed, and the air is a good insulator, preventing the buildup of ice pillows above the guide device 22.Upon completion of technical operations at this point the waters, if necessary, driving MBU on the flow of the refrigerant is stopped. On these same channels can be skipped another working fluid agent with a high temperature (heated water, air, exhaust gases from the running engines, etc.,) In the layer of contact between pile and soil liquefies and facilitates the removal of the pile from the ground.The inner surface of the casing 15 is covered with the insulating material 16, which prevents the freezing of nahodyaschiysya production (lifting) at the point of drilling, successfully resists the movement of the ice field and reduces the cost of manufacture of individual elements of the structure.And the placement of piles 4 on the inner perimeter columns 2, 3 allows you to get a ring of frozen soil, which increases the weight attached to the ground, the cross-sectional area formed ring at a much lower cost cold than when fully frozen mentioned volume of soil. 1. A device for temporarily holding an offshore drilling rig in the Arctic shelf, containing the supporting base with support columns with piles, interacting with implementation mechanism, characterized in that each pile along its inner surface is made with hollow ribs, part of which is made of a perforated and through its collector connected to the washing liquid, the hollow part of the ribs is connected through its collector to the supply system refrigerant, and the remainder of these ribs through its collector to the system to lose fluid, each pile is provided with a nozzle for supplying it with compressed air and a discharge pipe pulp connected with the discharge pipe, the lower end of which RA is the column along its perimeter and equidistant from each other.
SUBSTANCE: device for anchoring floating structures incorporates mooring bar with ends furnished with the appliance to turn the aforesaid rod about its axis of rotation. At that the rod free end is provided with a sleeve letting the chains or cable to pass there through. The anchor chain passed through one of the aforesaid sleeves is fastened at one end faces of the said floating structure. Besides that, to up the structure stability, the proposed device can be furnished with links connecting the free ends of both mooring rods to the structure in question.
EFFECT: anchoring system causing no floating structure trim difference and providing for stable positioning with minor drift, reduced distance between anchor and floating structure.
11 cl, 15 dwg
SUBSTANCE: system for stabilisation of sea platform mounted of gravitation foundation and anchored at sea bottom consists of multitude of sets of upper blocking elements installed on keel at lower part of platform, of great number of caissons installed at sea bottom, of great number of removable insertions each installed in each of caissons and of set of lower blocking elements in each insertion. Each set of the lower blocking elements is designed to engage with one of sets of the upper blocking elements by means of block system, when the keel is set above caissons. Insertions correspond to a tight attached to the keel cementing material pumped into insertions through the keel. The system stabilises the platform relative to forces of lateral shear and also facilitates easy removal of the platform off the caissons with insertions attached to the keel by applying upper lifting force. Further the platform can be transported and mounted of the second set of caissons arranged at the second site of sea bottom.
EFFECT: group of inventions facilitating mounting of platform ensuring good resistance to lateral shear forces and eliminating difficult and expensive operations for installation of shear skirts.
19 cl, 9 dwg
FIELD: construction industry.
SUBSTANCE: installation method of bottom complex for performing works on shelf involves assembly of tower erected on the ground and consisting of cone- and taper-shaped sections mounted in series on foundation base with sealing skirt embedded in bottom. Foundation base is installed with hoisting winches and ropes on water-borne vehicle and transported to installation site. Foundation is lowered with coordinated rope movement to bottom. Complex is built up with sections as to height which is more than depth of complex installed on bottom of water area. Vertical position of longitudinal axis of complex is ensured with simultaneous operation of jacks and vibrators arranged on external side along the perimetre of the base. Internal volume of tower is dried. Removal method of bottom complex involves filling of internal tower volume with water. Water-borne vehicle is submerged by means of method of ballast water into tanks. Sag of ropes is chosen with hoisting winches and they are fixed. Ballast water is pumped from tanks. Vibrators and jacks are activated simultaneously till skirt of foundation completely comes out of bottom ground. Complex is transported to new installation place. Complex of equipment includes tower to be installed on ground, and water-borne vehicle. Tower has foundation base with enlarged surface area and sealing skirt, hollow housing with cross section decreasing as to height so that upper section of housing installed on the ground is located above water level. Water-borne vehicle has two hinged housings equipped with tanks, and ballast water receiving and discharge systems.
EFFECT: providing reliable installation of complex on unprepared bottom ground, stability of complex at lateral loads with no anchors available.
10 cl, 3 dwg
SUBSTANCE: invention relates to sea oil extraction platforms. Proposed SPAR platform 200 comprises hull 2202 with central hast 204. Air- and watertight partition 210 runs across central shaft to make variable-buoyancy compartment 220 in central shaft. In compliance with some versions, central shaft bottom is exposed in sea, while in compliance with other versions, central shaft bottom is sealed. At least one pipe 224 to house riser 227 runs through partition and said variable-buoyancy compartment. Said pipe has exposed top face to allows drainage of water accumulated in central shaft to make air- and watertight seal in joint with bulkhead. In some versions, two or more air- and watertight partitions 206, 208, 210 are arranged across central shaft to form one or more air- and watertight ballast tanks 216, 218 arranged fixed between every adjacent pair of bulkheads.
EFFECT: increased platform buoyancy due to its adjustment by central shaft.
16 cl, 4 dwg
SUBSTANCE: ice-resistant support block of a marine engineering facility comprises a cylindrical shaft, a support unit and supporting braces. The shaft is made as hollow. The shaft is hingedly connected to supporting braces. The support unit comprises a support ring. The support ring is formed by at least three rectilinear pontoons. Pontoons are rigidly connected by their ends. The support ring is rigidly fixed to the cylindrical shaft by hollow radial spacers. Supporting braces are rigidly connected to the support ring by lower ends. Pontoons of the support ring, radial spacers, a cylindrical shaft and hollow supporting braces are made as capable of their floatability adjustment from positive to negative one.
EFFECT: invention provides for the possibility of serial construction, reduced labour intensiveness of installing a support block on site and its removal from soil, high repairability and capability of re-equipment in the dock.
8 cl, 6 dwg
SUBSTANCE: method to install a platform support block provides for support block transportation, its submersion to the sea bottom and installation onto soil. Ballast reservoirs are used during transportation. Ballast reservoirs are inner cavities of structure elements. During installation the first installation unit is ballasted down. The shaft is put into vertical position. Its eyes are brought to the level above sea surface. Spacers are ballasted to ensure hinged connection of their eyes with eyes of the vertical shaft. The ballast is pumped from the support ring pontoons and/or radial spacers and/or vertical shaft. Spacer ends are put in contact with the support ring due to slight surfacing up of the first installation unit. Spacers are rigidly fixed. Assembly pontoons are ballasted. Its lowering to the prepared bottom section is provided.
EFFECT: simplicity of structure installation, possibility of serial construction, high repairability and possibility of re-equipment in the dock.
SUBSTANCE: superstructure is built on a building slip in a dock on a support deck installed on side walls of the dock. A transport barge that has taken the ballast is introduced into the dock under the superstructure, and the superstructure is installed by means of ballast pumping away from the barge on its deck with its subsequent transportation to a marine oil and gas field. A hydraulic engineering pocket is arranged in place of installation of a support part of a marine oil and gas production facility on the marine oil and gas field. Length, width and depth of the latter make it possible to lead the transport barge to the support part, to install the superstructure onto the support part after taking the ballast by the transport barge, and also to move the transport barge away from the marine oil and gas field after pumping of ballast from it.
EFFECT: invention makes it possible to eliminate using additional crane facilities for transportation and assembly of a superstructure of marine oil and gas production facilities onto a transport barge, and possibility to exclude construction of a marine channel for passage of a transport barge to an oil and gas field in shallow waters.
FIELD: machine building.
SUBSTANCE: proposed system comprises foundation 12, hydroelectric turbine 10 to rest on said foundation 12, and afloat sea ship 14 that allows detachment of said foundation. Ship 1 allows detachment of foundation 12 and its lowering, and/or lifting to position right under the ship, and its attachment to ship. Foundation 12 comprises support 32 to pass upward through ship 14 when foundation 14 is attached to ship from below. Ship 14 has opening 30 for foundation 32 to pass through when foundation 12 is mounted under ship 14 to allow turbine 10 mounted on support 32 to pass there through.
EFFECT: simplified mounting.
13 cl, 7 dwg
SUBSTANCE: shoe comprises a body and a unit of shoe attachment to a support pillar. It has zero or positive buoyancy and is arranged as capable of changing zero or positive buoyancy to buoyancy of a low negative value. The shoe body comprises a hole for stretching of a support pillar, besides, the specified hole is arranged in the centre of the shoe and comprises vertical guide slots for interaction with racks of the support pillar. The unit of shoe attachment to the support pillar comprises two stops, every of which is equipped with a guide sleeve placed in a body, a sliding block installed in the guide sleeve, and a manual drive to move the block in the guide sleeve.
EFFECT: simplified assembly of a shoe to a pillar.
11 cl, 5 dwg
SUBSTANCE: invention relates to hydraulic engineering construction of structures and may be used for year-round drilling under conditions of the Arctic shelf. The platform comprises a bottom ballasted plate with an inbuilt support unit and a superstructure. The bottom plate is made in the form of an upper part, a lower part and a sliding sectional support unit of telescopic type. The support unit comprises telescopic sections that are separated at the installation point with a sliding mechanism. Telescopic sections, the sliding mechanism and all required auxiliary devices are installed in sluice compartments. All telescopic sections are of identical height, cylindrical or prismatic shape, and comprise guide slots on the inner and outer surface. Inner and outer cuts of the sections are selected for each other so that arrangement of sections is provided within each other with a gap sufficient for sliding and sealing of sections along the section guides relative to each other, in accordance with the telescope principle. The lower section's cut is larger than the upper one's. Sections of the support unit are arranged in a reinforced ice version. The invention also discloses methods of transportation, assembly and disassembly of a self-lifting mobile ice-resistant drilling platform of telescopic type.
EFFECT: increased reliability of a platform, lower labour intensiveness of methods of its transportation, assembly and dismantling.
13 cl, 3 dwg