System of protecting well from effect of ice massif
SUBSTANCE: invention refers to exploitation of under-water deposits of fluid and gaseous minerals, particularly, hydrocarbons; notably, invention refers to underwater process assemblies facilitating operation on shelf in the high seas at presence of floating ice massifs including icebergs and ice hummocks. The system consists of a protective conveyer assembled above a wellhead and made in form of a solid casing withstanding a load comparable to the critical load of ice massif impact. Also the casing is equipped with a row of sensors triggered at the load exceeding the critical one; the said sensors are electrically connected with shut-off automatic system operating upon receiving a signal from sensors of a well head sealing facility.
EFFECT: facilitation of mobility, upgraded technological effectiveness, economic efficiency and reliability of the structure.
2 cl, 1 dwg
The invention relates to the field of underwater exploration of deposits of liquid and gaseous fossil, in particular of hydrocarbons, namely underwater technological facilities that support the carrying out maintenance work on the shelf seas (Arctic region) in the presence of mobile ice massifs, including hummocks and icebergs.
Known for Foundation design of offshore platform (patent RF №2030503, publ. 10.03.95)containing monolithic concrete caisson consisting of a top plate, a bottom plate, two coaxial protective walls - internal and external, designed to withstand the shock of the iceberg. These walls are located vertically between the plates and rigidly connected with them. The external wall of the caisson consists of protective elements of complex shape, able to hack into the surface of the iceberg hits in the caisson.
The disadvantage of this stationary design is that it is technologically complex, cumbersome, and construction of such structures is not always justified from the point of view of economy and technology in the development of deposits in the ice regions of the Arctic.
A known design of a technological complex for the development of underwater mineral deposits on the shelf to ensure protection technology (wellhead equipment from stalks is disappearing with icebergs (RF patent No. 2215847, publ. 10.11.03)containing sea platform, underwater satellites and onshore technological base, linked by communications. Offshore platform includes a base rigidly connected with the ground by means of piles. On the basis of the installed horizontal platform with technological equipment, and underwater satellites include wells with wellhead. The basis of the offshore platform comprises at least two parts: the lower, rigidly connected with the ground, and the upper, which is a horizontal platform with technological equipment. The base is provided with fixing elements for sequential fixing the relative position of the bottom, top bottom and a horizontal platform between themselves and the elements quick couplings communications technology, providing the possibility of relative movement of the parts of the base. The proposed design can increase operational safety by providing for the possibility of excluding the interaction of the offshore platform with the ice massif, in particular, icebergs through control parts (position change) of the Foundation in an emergency situation.
The disadvantage of the design is its complexity, bulkiness and stationarity. Neale obraznym is its construction in the development of small underwater mineral deposits.
Known for the design of offshore ice-resistant platform with protection from the impact of moving ice arrays (RF patent No. 2130526, publ. 20.05.99)containing ice caisson made with the bottom and upper support plates rigidly connecting the inner and outer profiled with protection from the effects of ice elements wall mounted with a gap relative to each other, and the upper structure mounted on the upper base plate and made of a technological function blocks. The caisson performs the function of the protective container is not filled with water. The platform is further provided with auxiliary Legoland visor. Protective elements in the form of segments of cylinders rotation with a tapered profile in the upper part. With regard to the depth of the sea at the place of installation of the offshore ice-resistant platform outer profiled wall with protective elements are tapered part in the impact zone of the ice.
This stationary design provides protection wellhead equipment, however, the development of small and medium-sized fields, the construction of such platforms is unjustified due to the technological complexity of its installation, the bulkiness and unprofitable.
The world practice of fishery shows that the development of large and Melk the two fields requires a different approach. The main difference is that for the development of small and medium-sized fields require a relatively cheap, portable and secure, in the case of field development in Arctic conditions, design. The challenge is to develop such structures.
The technical result consists in providing mobility, improving manufacturability, cost effectiveness and reliability, ensuring the protection of the wellhead equipment at risk of collision with the moving ice masses, in particular icebergs and hummocks.
The claimed result is achieved due to the fact that in contrast to the known system protection wells (wellhead) from the effects of ice massifs, including hummocks, in terms of the development of underwater hydrocarbon containing erected over the mouth of a protective container, in the proposed system the container is made in the form of a durable shell that can withstand the load, comparable with stroke occurs when ice masses of the critical load, the shell is equipped with a range of sensors, characterized by the possibility of their operation when the load is greater than critical, and electrically connected with automatic turn on signal from the sensor means sealing the wellhead.
In addition, in the system, in particular, as the sensor can b the th selected load cell or sensor movement.
The execution of a container in the form of solid, based on the proposed terms of the shell, can significantly ease the installation technology design on the bottom base due to its mobility and eliminate the need for comparison with a prototype for a complicated and cumbersome economically and technologically costly manipulation of stationary platforms. The equipment of the shell near the sensors can be triggered when the load exceeds a critical, you can control the environment that the presence of the electrical connection of sensors with automatic turn on signal from the sensor means sealing the wellhead equipment will provide reliable protection of technological equipment.
Offer to the specific choice of sensors - load cell or sensor movements are the most affordable from the point of view of their capacity to respond to the critical load.
That is the claimed design in the proposed essential features allows reliable, technologically simple, mobile and cost-effective to protect wellhead equipment from destruction ice array in an emergency situation.
The drawing schematically illustrates the system of protection, where the positions indicated:
1 - shell 2 - built-in sensor, 3 - b is OK automation, providing a transmission signal from the sensors, 4 - means for sealing the mouth.
Protection system shown in the drawing, is installed in a submerged position at depths possible passage of hummocks above the wellhead pre-calculated strength of the cylindrical shell (1)holding load, comparable with stroke occurs when ice masses critical load, for example, steel. Wrapped embed a system of load cells (2). Sensors connected to the system to automatically turn on in an emergency (approximation of Toros) the overlap (seal) mouth (4), in particular valve.
The protection system operates as follows. When approaching the Toros load cell (2), sends a signal to the emergency system to automatically turn on (3). The sensor signal is a control tool overlap (valve) wellhead (4).
Thus, the choice of the form of the container and the properties of the material from which it is made, in combination with the built-in container system emergency response and automatic wellhead sealing promote mobility, improve manufacturability, cost effectiveness and reliability, ensuring the protection of the wellhead equipment of the well at risk of collision with the moving ice m is suami, in particular icebergs and hummocks.
1. System protect the well from the effects of ice massifs, including hummocks, in terms of the development of underwater hydrocarbon containing erected over the mouth of a protective container, wherein the container is made in the form of a durable shell that can withstand the load, comparable with stroke occurs when ice masses of the critical load, the shell is equipped with a range of sensors, characterized by the possibility of operation at a load greater than critical, and electrically connected with automatic turn on signal from the sensor means sealing the wellhead.
2. The system according to claim 1, characterized in that the sensor selected load cell or sensor movement.
FIELD: machine building.
SUBSTANCE: environmental separation method in airlifting of submersible deposits of minerals and its implementation system which comprises lifted pipe, replenishment camera with a branch, feeding pipe, pump with force piping, air separator assembled on the lifted pipe, lifted pipe mixer connected to the force piping of the pump, compressor with a corresponding force piping, water separator assembled in an intermediate cross section of the pump force piping - separate accumulator, connected to a separate accumulator, and branch outgoing to environment, additional mixer connected to the pump force piping and to the compressor force piping, and fluid consumption sensor. Additional accumulator is installed in the intermediate cross section of the feeding pipe, and suction and force pipelines of an additional pump are tied to an additional accumulator. The separate accumulator comprises indicators of fluid level, suction pipeline of the additional pump is equipped with a tip, located in the additional accumulator. The force pipeline of the additional pump comprises pivotal position distributing valve, and blade wheel is installed in the additional accumulator. At that the force piping of the pump and the branch, connected to the separate accumulator, are equipped with corresponding controlled valves. The suction pipeline of the compressor is equipped with a filter and connected to an air separator, while a rotation speed sensor - a tachometer -is connected to the blade wheel.
EFFECT: improvement of environmental separation method in airlifting of submersible deposits of minerals; improvement of the ocean ecosystem.
2 cl, 5 dwg
FIELD: mining, particularly development of sand-and-gravel and placer deposit with hydraulic dredges.
SUBSTANCE: method involves creating hydraulic mix with flow-rate exceeding suction means of hydraulic dredge; condensing hydraulic mix in condensing-and-separation device and separating the hydraulic mix into condensed and settled portions; delivering condensed portion into suction means of hydraulic dredge; returning settled portion to mine face. Device for described method realization comprises suction means of hydraulic dredge, socking head, pipeline and pump for hydraulic mix forming and supply from mine face. Device also has attachment system including independent socking head, condensation-and-separation device and outlet to discharge settled portion into sump.
EFFECT: increased output, possibility of initial material refinement and extended mining depth.
16 cl, 6 dwg
FIELD: mining, particularly to develop deposits in shelf adjoining shore line.
SUBSTANCE: method involves forming enveloping structure made as two adjacent closed structures, which surround placer deposit area, extending from bedrock to water surface with the use of plates having vertical edges to be releasably connected with that of at least two adjacent ones so that one plate is used as structure partitioning wall, wherein enclosing structure creation is carried out by serial plate insertion up to bedrock with simultaneous plate edge connection with each other; introducing excavation equipment for placer material mining inside structures after enveloping structure forming; mining placer material in the first structure; excavating placer material in the next structures with tails stacking in previous structure up to level of not less than water area bottom; creating next enclosing structures by serial plate removal so that one plate side touches massif surrounding excavation area and another side thereof is in contact with filling massif including tails or both plate sides touch filling massif; serially inserting removed plates in deposit up to bedrock along with plate edge connection with that of plates adjoining enclosing structures to be developed. New enclosing structures are created from mining propagation side.
EFFECT: increased efficiency of placer material mining, provision of inner enveloping structure cavity dimension independence of placer deposit thickness in capping rock presence and increased mining completeness.
6 cl, 4 dwg
FIELD: mining, particularly to develop deposits in shelf adjoining shore line.
SUBSTANCE: method involves forming enveloping structure made as closed barrier, which surrounds placer deposit area, extending from bedrock to water surface; separating space inside enveloping structure in at least two chambers; introducing excavation equipment for placer material mining inside chambers after enveloping structure forming; mining placer material in the first chamber; excavating placer material in the next chambers with tails stacking in previous chamber up to level of not less than water area bottom; removing enveloping structure chambers from the goaf side of mining area adjoining chambers from which placer material is excavated and forming thereof in immediate proximity to chambers from mining propagation side.
EFFECT: increased mining completeness, provision of inner enveloping structure cavity dimension independence of placer deposit thickness in capping rock presence.
5 cl, 4 dwg
FIELD: mechanical engineering, particularly underwater mineral deposit mining.
SUBSTANCE: method involves using system including lift tubing, supply chamber with connection pipe, supply pipe, pump with injection pipeline, air separator installed in lift tubing, lift tubing mixer communicated with injection pipeline and pump with corresponding heating pipeline. The system also has water separator installed in intermediate cross-section of injection pipeline. The water separator is made as independent accumulator. The system includes connection pipe attached to independent accumulator, additional mixer communicated with injection pipeline and liquid flow meters. Additional accumulator is arranged in intermediate transversal cross-section of lift tubing. Sucking pump pipeline and sucking compressor pipeline are connected with additional accumulator and air separator correspondingly. Independent accumulator comprises liquid level indicators. Sucking pump pipeline is communicated with additional connection pipe provided with controllable gate. Sucking compressor pipeline comprises filter. Consistometer is connected with supply pipe.
EFFECT: increased efficiency of continuous underwater mineral deposit element lifting due to increased marine hydraulic rams.
2 cl, 5 dwg
FIELD: mechanical engineering, particularly underwater mineral deposit mining.
SUBSTANCE: method involves lifting underwater mineral deposit members included in hydraulic mixture; creating multi-component mixture; injecting compressed air into hydraulic mixture flow; transporting multi-component mixture flow inside lifting pipe of marine airlift; supplying compressed air into separate water flow along with following conveyance of compressed air included in water-air mixture and supplying compressed air extracted from water-air mixture flow to lifting pipe of marine airlift. First of all hydraulic mixture flow rate in airlift supply pipe is set. Ocean stream energy is converted into electric power to be supplied to electric drives of airlift compressor and pump. Hydraulic mixture rate in marine airlift supply pipe is controlled and said controlled value is compared with predetermine value to provide equality between both values by regulation of depth of electric power station submersion in ocean. Said electric power station converts ocean stream energy into electric power.
EFFECT: increased lifting efficiency and ecological safety of underground mineral mining due to possibility of supplementary natural energy source usage.
2 cl, 6 dwg
FIELD: obtaining minerals from underwater, particularly to produce ferromanganesian concretions from Baltic sea shelf in the case of low concretion depth.
SUBSTANCE: concretion production device comprises main watercraft, receiving means and winch mounted on the watercraft, as well as angle pulleys, head and rear haulage ropes, perforated vessel having rectangular cross-section and provided with cutting edges and locking means. Device also has movable means for rear haulage rope angle pulley fixation in space. The movable means is made as supplementary watercraft fastened to main one by means of two steel wire rope branches. The steel rope passes over additional angle pulley arranged on supplementary watercraft. Free steel rope ends are fastened to drum of additional winch installed on main watercraft. Running wheels are arranged in upper vessel part by means of holders so that they may cooperate with both steel wire rope branches in top and bottom parts thereof and displace above branches in longitudinal direction. Vessel locking means is made as rotary sector connected with crank installed on vessel side wall through connecting-rod. Crank may cooperate with curvilinear strap supported by main watercraft. Rear haulage rope is fastened to upper sector edge. Both winches are secured to rotary platform, which may rotate in horizontal plane with respect to main watercraft body. Distance between steel wire rope branches exceeds vessel width. Additional angle pulley diameter exceeds that of angle pulley of rear haulage rope. Both pulleys are in axial alignment with each other and provided with means, which prevents rope dislodgement.
EFFECT: increased efficiency of concretion production equipment due to decreased labor inputs and increased concretion output.
FIELD: mineral mining, particularly obtaining minerals from underwater.
SUBSTANCE: rig comprises frame provided with floating pontoon supports, compressor, electromagnetic valves, concretion accumulation vessel, drum reels fixed with electric drives and endless chains with buckets. Each bucket comprises gas and float chambers and chamber filling device. Each float chamber has bellows hermetically connected to float chamber bottom and metal plate. Bellow interiors are communicated with armored continuous gas-distribution pipe passing over drums. Float chambers may reduce bellows volumes from one side of the chain and increase bellow volumes from another side thereof. Rig also has additional frames provided with propeller screws, air harness including poles and automatic harness control device. The automatic harness control device comprises force transducer and wind direction sensor. Wind direction sensor includes distinguishing plate provided with constant magnet, which cooperates with reed switches by means of magnetic field. The reed switches are arranged on annular fixed support. Wind force transducer includes pipe, cylindrical vessel, float and rod cooperating with microswitch. The cylindrical vessel is connected with pipe.
EFFECT: decreased power inputs for rig moving over water area and mineral lifting from ocean bed and extended range of technological capabilities.
9 cl, 37 dwg
FIELD: hydraulic mechanization.
SUBSTANCE: invention can be used in mining placer deposits of high density in underwater faces. Proposed ripping-and-suction device or suction-tube dredger includes pipeline, suction head with screen containing rigid disk with radial slots and central impenetrable circle. Each radial slot is connected with suction head through sealed variable cross section channel. Total area of radial slots does not exceed area of cross section of suction head. Suction head is provided with rotation drive including intercoupled electric drive, safety clutch, reduction gear, propeller shaft and chain drive to rotate screen. Suction head is connected with pipeline of turnable insert with support adjustable in height to adjust tension of chain drive. Radial stiffening ribs are arranged get on rigid disk between radial slots, and ripping blades with cutting edge are located under stiffening ribs.
EFFECT: increased efficiency of mining placer sands, reduced losses of valuable high density components.
FIELD: mining industry, possible use for collecting and sending mineral resources, ferromanganese concretions in particular, to the surface.
SUBSTANCE: complex for extracting mineral resources from ocean shelf zone consists of a surface vessel, endless transporting traction carrier tool with buckets and bottom extraction plant. Traction carrier tool is made in form of conveyor belt, and buckets are made in form of float buckets, positioned with given interval and made with two hollows, one of which is filled with incompressible substance with density less than 1 ton/m3. Traction carrier tool is also provided with hydrostatic intermediate drives positioned on support between branches of conveyor belt, each one of which contains electric motor, leading gear, following drum, and additional conveyor belt with apertures and rods positioned across its whole length, stretching mechanism, pump and support with apertures. By means of branch pipes held on support, pump is connected to closed spaces, formed as a result of tight contact of apertures in support and apertures in additional conveyor belt, mounted in such a way that its rods may interact with leading gear and made with possible friction contact with conveyor belt and possible sliding relatively to support.
EFFECT: extended extraction depth, lower losses of mineral resource during transportation, increased traction force of transporting contour.
SUBSTANCE: invention relates to hydro-technical construction and may me employed in drilling activities in soundings and in the conditions of open water area. Self - lifting floating drilling unit includes self-lifting platform equipped with the drilling set, shafts with support pillars, mechanism for retention of lifting and dropping of the platform, additional equipment for drilling activities and assembly crane. The platform is made as a pontoon consisting of waterproof sections and having an auxiliary shaft for passing through of the drilling equipment. Support pillars set in the central and nose parts of the platform are combined in the upper part by means of flange joints with extensions of shape similar to that of the support pillars, whereat tower of the drilling unit is made integral with the head end of the extensions by means of cable rods. Assembly method of the self-lifting floating drilling unit is presented.
EFFECT: simplification of design of self-lifting floating drilling unit, decreasing labor costs connected with its manufacture and assembly; enhanced safety through even loading of pull-out support pillars.
5 cl, 10 dwg
SUBSTANCE: construction method of a self-lifting drilling platform containing a pull-out console accommodating subsea wellhead equipment includes manufacturing of a console of sectional longitudinal bearing and boxlike transverse beams with railings. Whereat additional sections of longitudinal bearing beams are manufactured and extended by previously made sections, whereat aggregated length of longitudinal bearing beams is extended by the value adequate to the spacing in the boreholes network. After that longitudinal bearing beams are retracted up to the value sufficient for fastening on them of subsea wellhead equipment placed in the cross plane of the console. Then, previously made boxlike cross beams accommodating railings are set on the longitudinal bearing beams; and their length is increased by means of welded to them at the ends boxlike extensions, whereon additional parts of railings are arranged.
EFFECT: decreased labor intensity of works during construction of self-lifting offshore drilling platform on the bases of the already manufactured one for widening its operational possibilities including that for drilling of greater number of boreholes along with improving storage conditions for subsea wellhead equipment and simplification of its transfer to the wellhead.
3 cl, 7 dwg
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: building structure includes two faceplates where the said two faceplates are placed on each side of solid-state composition which contains solid particles in amounts of 90 to 96% of overall solid-state composition mass and 10 to 4% of asphaltenes mass containing binding substance which includes 15 to 95% of asphaltenes mass from binding substance total amount. The asphaltenes contain not less than 60% of aromatic carbon mass and 5 to 85% of other carbons mass from binding substance total amount. The said binding substance has penetration below 15 dmm measured at 25°C. Also structural pre-fabricated panel with two faceplates is defined.
EFFECT: structural strength and high impact toughness.
8 cl, 1 tbl, 4 ex
FIELD: construction, particularly artificial islands mounted on piles or like supports and formed of a number of floating members.
SUBSTANCE: floating member comprises a number of wavy side surfaces to be connected with that of another similar floating member, four fastening lugs each located between two wavy side surfaces to receive fastening rings, upper surface and non-smooth lower surface for wave energy dissipation. Non-smooth lower surface has a number of uniformly distributed wavy ribs or a number of concentric profiled ribs or radial area including alternating valleys and projections and a number of projections located in areas separated with radial area of alternating valleys and projections.
EFFECT: increased efficiency of wave energy dissipation and improved floating member stability on water surface.
12 cl, 7 dwg
FIELD: hydraulic construction, particularly to construct offshore oil, gas and gas condensate production platforms arranged in northern river mouths and in shallow freezing sea shelf.
SUBSTANCE: method involves arranging at least one traveling platform in point of well cluster drilling. Traveling platform has cut made in bottom plate of support block. Head module with composite manifold is provided with additional bottom plate and is arranged in lower part of support block so that it may be separated and moved within said bottom plate cut. Technological modules are also arranged in lower part of support block so that at least one module may be separated from support block and slide inside it. After traveling platform installation in drilling site head module with composite manifold on supplementary bottom plate is installed on bottom within the cut of bottom support plate, wherein drilling module is arranged over head module with composite manifold location inside support block at height of not less than sea level. Interior of detachable vessel included in technological module is communicated with each well head interior through hydraulic line provided with valves.
EFFECT: increased speed of deposit putting into operation due to provision of all-the-year-round deposit drilling and platform operation.
27 cl, 8 dwg
FIELD: artificial islands mounted on piles or like supports, particularly adapted for hydrocarbon fuel production of oil and gas condensate, for off-shore territories supply with hydrocarbon fuel and for shit fueling and tank loading with fuel.
SUBSTANCE: marine complex in accordance with the first embodiment comprises bearer made as self-lifting offshore drilling platform having columns fixed on non-prepared marine bottom so that distance between sea surface and pontoon may be changed. In working position the platform is located over water and is supported by the columns. Complex also has loading system installed on pontoon deck and at least two manifolds to receive raw material and to deliver ready hydrocarbon fuel. Initial raw hydrocarbon material cleaning and dehydration plants are arranged in closed rooms on pontoon deck. Complex made in accordance with the second embodiment comprises underwater pontoon and bearer made as self-lifting offshore drilling platform having support columns and pontoon-type body. In working position the pontoon is located over water and is supported by the columns. The support columns are installed on underwater pontoon. The underwater pontoon has shaft communicated with offshore drilling platform pontoon to provide access to underwater one and comprises weight system provided with raw material and ready hydrocarbon fuel manifolds, as well as with raw material and ready fuel tanks. The complex also has local control station communicated with automated above-water pontoon control station.
EFFECT: increased efficiency of hydrocarbon fuel production, improved reliability, decreased costs for complex establishment and erection.
8 cl, 5 dwg
FIELD: hydraulic structure construction, particularly to protect self-elevating floating drilling installation in freezing sea shelf.
SUBSTANCE: protection device comprises protective ice-resistant structure with ground core fill arranged inside it. Ice-resistant structure is made as integral double-walled shell, which may float due to shell air-tightness. The shell has bottom and deck extending along shell perimeter, as well as shaft orifices to receive support columns of self-elevating floating drilling installation. The shell has ballast system including ballast pumps, drilling conductor, as well as mooring, towing and anchoring means. Method for protection device installation involves manufacturing protective ice-resistant structure; transporting thereof by water; installing protective ice-resistant structure on water body bottom in designed position; forming ground core fill. Before protective ice-resistant structure installation on water body bottom the structure is jointed with self-elevating floating drilling installation when protective ice-resistant structure is located under water by directing self-elevating floating drilling installation so that support columns thereof are over shaft orifices made in protective ice-resistant structure. After that support columns are inserted in shaft orifices and ice-resistant structure emerges along with self-elevating floating drilling installation by ballast removal therefrom. Then the assembly is moved to drilling point and lowered on bottom in designed position.
EFFECT: increased efficiency of drilling installation usage, decreased time and costs of self-elevating floating drilling installation provided with protective device construction.
3 cl, 11 dwg
FIELD: continental shelf development, particularly artificial islands mounted on piles or like supports.
SUBSTANCE: mounting system comprises two floating crafts, platform transportation pontoon arranged in-between, platform-bearing pile foundation, platform handling piles having parts movable in vertical direction and fixing stops. Platform transportation pontoon includes tow boat arranged in pontoon area so that tow boat immersion provides system usage in low water. Platform mounting method involves installing platform handling piles provided with movable parts sliding in vertical direction and fixing stops at base; moving pile transportation pontoon with platform installed thereon in space between platform handling piles and installing the pontoon between the platform handling piles; fastening moving parts of platform handling piles to platform bottom; discharging ballast from pile transportation pontoon to lift the platform over water surface and connecting movable parts of platform handling piles to platform handling piles by means of fixing stops; filling pile transportation pontoon with ballast to immerse thereof in water; removing ballast from pile transportation pontoon to lift the platform through height necessary for following platform loading on floating crafts; retracting pile transportation pontoon from platform; moving floating crafts to platform; transferring platform from platform handling piles to floating crafts; securing platform to floating crafts and moving platform to well drilling site; transferring platform to previously arranged pile foundation.
EFFECT: increased manufacturability and reliability, decreased labor inputs and extended operational capabilities due to provision of system operation in ice and in low water.
4 cl, 9 dwg
FIELD: hydraulic structures, particularly artificial islands mounted on piles or like supports, for example, platforms on raisable legs.
SUBSTANCE: offshore platform has support-elevating device including frame with vertical posts and main horizontal beams, as well as columns with main racks and connection members. Improvement method involves cutting lower parts of vertical frame posts by forming horizontal cuts, wherein cut-off lower part includes lower main horizontal beams; cutting frame into sections so that each section comprises two halves of posts, wherein the sections are connected with each other by main horizontal beams by cutting remainder post parts in center thereof by creating horizontal cuts; moving apart the obtained sections along with racks in centrifugal direction and forming new vertical frame posts by adding vertical beams to each section from outer side thereof and by connecting bases to lower section sides; fastening the bases to said new vertical frame posts, wherein each base has cross-section corresponding to that of said new vertical post; connecting the sections through additional horizontal beams installed at main horizontal beam level; forming columns by rigidly connecting additional racks to main ones and substituting rack connection members for new ones made as horizontal and inclined struts.
EFFECT: extended field of drilling platform utilization due to possibility of platform usage at large depths and decreased labor inputs for platform improvement.
2 cl, 9 dwg
FIELD: hydraulic engineering, particularly building bases and foundations, namely bridge piers, in water.
SUBSTANCE: method involves monitoring water obstacle in support building place, including investigating water parameters, recording water level in the course of year, determining floor shape, investigating floor ground, influence of outer disturbing forces and calculating weight and dimensions of support foundation case on the base of above parameters; producing hollow case with several cavities; moving case to installation place; submerging case in water; pacing thereof on floor; fixing case by piles and smoothing floor. Case submerging and placing operations are performed simultaneously with stabilizing vertical case position by performing control and filling of corresponding cavities. Bottom smoothing process is carried out by forcing artificial material, such as concrete layers with crushed stone interlayers, under case bottom. During case placing case is secured by blades built in case bottom and by piles inserted in cavities. Correspondence between case weight, number of blades, head resistance and side friction thereof for particular ground is determined to provide case stability on ground. Upper edge of submerged case is located above maximum possible water wave height. Rock fill is formed around underwater case part.
EFFECT: reduced time of support erection, increased reliability and stability, safety and service life, reduced labor inputs, possibility to erect supports in Arctic basin.
3 cl 1 ex