System of protecting well from effect of ice massif

FIELD: mining.

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.


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Composite structure // 2331520

FIELD: construction.

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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.

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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