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

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27 cl, 8 dwg

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8 cl, 5 dwg

FIELD: hydraulic structure construction, particularly to protect self-elevating floating drilling installation in freezing sea shelf.

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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.

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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.

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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.

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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

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