Mine underground storage in permafrost rocks

FIELD: construction.

SUBSTANCE: invention relates to the area of underground storage in the permafrost rocks and can be used in the gas, oil-extracting and petrochemical industry. The mine underground storehouse in the permafrost breeds 1, will gain the basic tunnel development 2, inclined development 3 for passing of the basic tunnel excavation, operational 4 and technological 5 boreholes. The basic tunnel development 2 is executed with a side raise of the technological boreholes 5. The operational borehole 4 is drilled in the bottom part of tunnel development 2, thus in an operational borehole 4 pipelines for reception 8 and selection 9 products of storage are placed. The corner of an inclination of the basic tunnel development does not exceed size at which an absolute mark of the ground 6 basic tunnel developments 2 in a zone of accommodation of a technological borehole 5 does not exceed an absolute mark of its roof 7 in a zone of an arrangement of an operational borehole 4.

EFFECT: increases the efficiency and reliability of the operation of the mine storehouse, to increase useful volume.

2 cl, 2 dwg

 

The invention relates to the field of underground storage in long-frozen sediments of oil, gas condensate and refined products and can be used in gas, oil and petrochemical industries.

Known underground storage shaft in long-frozen sediments, consisting of a main horizontal tunnel production, technological and production wells located at opposite ends of the tunnel generation [1].

The disadvantage of this underground storage is that when it is full, the roof of the main tunnel production can be air, which reduces the useful volume of the storage and preventing the frosting of ice lining.

Closest to the claimed technical solution is mine underground storage in long-frozen sediments containing the main tunnel production, inclined production for sinking the main tunnel production, operational and technological wells [2]. The solution is taken as a prototype.

The disadvantage of this underground storage is that when filled through operating the receiving bore, in particular a liquid product with a positive temperature at the bottom of an underground repository will be erosion the processes with soil washout main tunnel production and removal of soil in the sump wells selection of the product, which will inevitably lead to failure of the submersible pump.

Our problem is to increase the efficiency of operation of underground storage in long-frozen rocks.

In the result, achieved the following benefits of the proposed structures:

effective mixing of warmer product supplied in an underground vault, with the contained cold product;

- prevention of erosion soil erosion the main tunnel production;

- reduction of heat stored product on the walls of the main tunnel production, particularly on the roof, the most vulnerable to destruction in contact with warmer product.

This is achieved by the fact that in underground storage in long-frozen sediments containing the main tunnel production, inclined production for sinking the main tunnel production, operational and technological well, the main tunnel production performed with the rise in the technological side of the well and a production well drilled in the lower part of the tunnel production, with production well placed pipelines to receive and selection of product storage. The angle of the main tunnel production does not exceed the value at which the absolute level of the soil foundations of the th tunnel production in the area of technological wells do not exceed the absolute level of its roof in an area where wells.

Execution tunnel production with a bias towards production wells eliminates erosion erosion of soil development and the demolition of the mineral particles in the sump and, therefore, increases the reliability and lifetime of a submersible pump.

The location of technological wells at the site with the maximum absolute mark eliminates the formation of air voids in the roof framing when taking product storage and provides its full completion.

Placement of tubes for receiving and selection of product storage in one production well located at the site with the minimum absolute mark of soil main tunnel excavations, provides constant stirring accept product storage due to natural convection of warmer product, rising from the lowest level tunnel production to the top of the cooled layer, thereby reducing thermal impact on the capacity of frozen rocks.

In addition, given the angle of the main tunnel production allows to obtain the maximum area of the cooling surface of the product at minimum power the top of the cooled layer. This process occurs before the moment when the overall level of product in the storage reaches the roof of the main tunnel excavation.

Thus, the sum in shiprecycling signs improves the efficiency of operation of underground storage in long-frozen rocks.

Figure 1 shows a vertical section of underground storage in long-frozen rocks with partial filling it with liquid product, and figure 2 - when it is full.

Underground storage in long-frozen sediments 1 consists of a main tunnel generation 2, the inclined generate 3, 4 operational and technological 5 wells. The main tunnel production of 2 completed with a rise in the technological side of the well 5, and the angle of its inclination does not exceed the value at which the absolute level of the soil 6 tunnel generation 2 in the area of the technological hole 5 does not exceed the absolute level of its roof 7 in the area of wells 4. In the production well 4 posted by pipe 8 for the reception of the product storage and pipe 9 for its selection, in which is installed a submersible pump 10. In soil 6 tunnel generation 2 at the site of placement of wells 4 made the sump 11. Technological bore 5 is provided with a breather valve 12, through which an exclusion of air from the mine to the store when filled with product storage 13. On completion inclined generation 3 from the surface of the seal layers nomorejavaman podopechnym solution 14.

The work of underground storage in long-frozen on the odes as follows.

To fill the main tunnel generation 2 underground storage in long-frozen sediments through the pipe 8 wells 4 serves liquid product 13, for example, stable gas condensate, freezing temperature below the temperature of accommodating long-permafrost 1. The product level 13 when filling the main tunnel generation 2 gradually increases upward with simultaneous displacement of air in the atmosphere through a breather valve 12 technological hole 5. If the primary tunnel generation 2 is filled in the summer and the temperature of the product 13 is greater than the temperature of the accommodating long-permafrost 1, in the main tunnel development 2 pre-reserved portion of the contained cold product 13. When this warmer product supplied through the pipe 8 wells 4, now mixed with cold product 13 due to natural convection, resulting in surfacing more of the warm liquid.

Due to the fact that the main tunnel production of 2 completed with a rise in the technological side of the hole 5, it is filled with product storage 13 evenly filling the entire volume of output without air voids under the roof 7. Placement of tubes for receiving the product storage area with minimal absolute mark of soil 6 main tonnes is through generation 2 eliminates thermal erosion of soil development and the demolition of the ground particles in the sump 11 wells 4.

Because the absolute level of the soil 6 main tunnel generation 2 near technological hole 5 does not exceed the absolute level of its roof 7 at the site of placement of wells 4, the upper level of product storage 13, until you are approaching the technological borehole 5, does not reach the roof level 7 main tunnel generation 2 near production well 4 (figure 1). While the air trapped above the surface of the injected product 13, will serve as the heat insulating layer between the upper layer of product storage 13 and 7 tunnel roof framing 2. Under the scheme will be receiving product storage 13 to fill the main tunnel generation 2 (Fig 2). At the end of the shelf life of the product 13 last pumped to the consumer submersible pump 10 through a pipe 9 that is installed in the production well 4.

Thus, improving the efficiency of operation of underground storage in long-frozen sediments is achieved:

- reduction of thermal loads on the long-frozen rocks, containing the main tunnel production, which increases its long-term stability and life underground storage;

- with the exception of the development of thermal processes and the demolition of the ground particles in the sump wells in soil main tunnel is robotki while filling product storage, that increases the reliability of the submersible pump and its operation;

- maximum increase the efficiency of the main tunnel production due to its roof with a rise in the technological side of the wells located on the site of the main tunnel production, the opposite area wells.

A specific example of underground storage in long-frozen sediments can serve the projected underground storage stable gas condensate in the amount of 75 thousand m3in Yamburgskoye gas condensate field. Underground storage consists of a main tunnel excavations, sloping generation for sinking the main tunnel production, operational and technological wells. Hatchback generation section 14 m2passed in long-frozen sediments to a depth of 16 meters at an angle of 16° to the horizon. The depth of the main tunnel production temperature of perennial species varies from minus 3.5°to minus 4,0°C. the Main tunnel generation section 16.4 m2has a length of 320 meters. The absolute elevation of the soil surface of the main tunnel production in the area of technological wells at 2.5 m below the absolute level of the roof framing at the site of placement of wells. Perfo is operating well equipped with a pipe for filling the main tunnel generation product storage and pipe for its selection, in which is mounted submersible pump. The service life of underground storage is 50 years by providing conditions for the preservation of long-frozen soils under natural subzero temperatures.

Filling the underground storage of gas condensate in the autumn-winter period, the temperature of the condensate must not exceed the temperature of the accommodating long-frozen soils. The selection of the product to the consumer is at the end of the summer navigation period.

Sources of information

1. Smirnov, V.I. Construction of underground oil storage. M, Gasoil press, 2000, p.75.

2. Smirnov, V.I. Construction of underground oil storage. M, Gasoil press, 2000, p.16 (prototype).

1. Underground storage in long-frozen sediments containing the main tunnel production, inclined production for sinking tunnel production, operational and technological hole, characterized in that the main tunnel production performed with the rise in the technological side of the well and a production well drilled in the lower part of the tunnel production, with production well placed pipelines to receive and selection of product storage.

2. Underground storage in long-frozen sediments according to claim 1, characterized in that the angle of the primary tones the school production does not exceed the values in which the absolute level of the soil the main tunnel production in the area of technological wells do not exceed the absolute level of its roof in an area where wells.



 

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