RU2246437C1 - Method of building underground storage for gases in soluble deposits - Google Patents

Abstract

FIELD: gas, oil, oil refining and other industries.

SUBSTANCE: invention relates to building and operation of underground reservoir in stable rocks, for instance, soluble salt deposits. Method includes delivery of water and putting out brine along water feed and brine lifting pipes placed one inside the other, charging and storing of gas in underground reservoir. After brine lifting, reservoir is dried and then is filled up with alternating layers of absorbent and inert porous material, volume ratio 2:1, delivered along clearance between water feed and brine lifting pipes. Brine lifting pipe is perforated in lower part in height of reservoir and it is installed in lower part of reservoir. Difference between angles of repose of absorbent and inert material does not exceed 10 degrees. This done, reservoir is filled with gas delivered along perforated brine lifting pipe.

EFFECT: increased productive volume of reservoir owing to sorption of gas on surface of absorbent, reduced cost of gas storing.

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Description

The invention relates to mining, in particular to the creation and operation of underground reservoirs created in stable rocks, for example in deposits of soluble salts, and can be used to store natural and industrial gases in gas, oil, oil refining and other industries.

A known method of storing oil, oil products and gas condensate in a tank under an inert gas atmosphere, according to the invention, compressed air is introduced into the hydrogen sulfide and / or mercaptan-containing oil, liquid oil products and gas condensate in the presence of catalysts at a pressure of 0.3-3.0 MPa at a rate of 0.06 -0.12 nm ³ per 1 mol of hydrogen sulfide or 2 moles of mercaptans C ₁ -C ₃ , the solution is kept at a temperature of 10-65 ° C for 5-180 minutes, after which it is fed to a tank, where the liquid pressure is reduced to 0, 1-0.6 MPa. The disadvantage of this method is the high cost of the reagents and the low use of the product volume of the tank (Application for invention of the Russian Federation, 2001126937/06, 7 F 17 C 11/00, 2000.03.03).

A known method of operating underground gas storages in sediments of soluble rocks, adopted as a prototype (RF Patent 2211179, 7 B 65 G 5/00, 2001.12.27). The method includes injecting gas into an underground tank while displacing brine from it, storing and taking gas by lowering the pressure in the product space of the underground tank, according to the invention, after displacing the brine into the bottom of the tank under pressure, a binder composition is injected that creates a solid phase in the volume of residual brine . The disadvantage of this method is the low use of the product volume of the tank.

The technical result of the invention is to increase the used product volume of the tank.

The technical result is achieved by the fact that in the method of creating underground gas storages in sediments of soluble rocks, comprising supplying water and dispensing brine through water supply and brine lifting pipes located one in another, pumping and storing gas in an underground reservoir, according to the invention, the reservoir is drained after brine dispensing, then, in the gap between the water supply and the brine lifting, perforated in the lower part along the height of the tank and installed in its lower part, the tank is filled with alternating layers of absorbent of inert porous material in a volume ratio of 2: 1, and the difference between the angles of repose of the absorbent and inert material does not exceed 10 degrees, after which the reservoir is filled with gas through a perforated brine lift pipe.

The application of the method compared with the prototype allows to increase the used product space of the tank.

The method is illustrated by the drawing, which shows a longitudinal section of the storage in sediments of soluble rocks, where

1 - brine pipe;

2 - water supply pipe;

3 - perforation in brine pipe;

4 - reservoir;

5 - absorbent (e.g. activated carbon);

6 - inert porous material (for example expanded clay).

The method of creating underground gas storage in sediments of soluble rocks is as follows. The tank is created by supplying water through the gap between the water supplying 2 pipe and brine-lifting 1 pipe, which are located one in the other. The brine is displaced through the brine-lifting 1 pipe. After the brine is dispensed, location measurements of the reservoir 4 are made, its configuration and volume are specified. Then carry out leak tests, after which the tank 4 is drained by pumping water through brine 1 pipe. After drying, the brine-lifting pipe 1 is lifted and perforation 3 is made in its lower part along the length equal to the height of the tank 4. Then the pipe 1 is lowered until the lower boundary of the product space of the tank 4 is reached. After that, the tank is filled with layers by the gap between the brine-lifting 1 and the water-supplying pipe 2 absorbent 5 (for example, activated carbon), alternating with an inert porous material 6 (for example, expanded clay). An inert porous material 6 is used to prevent caking of the absorbent 5 and creating additional channels for filtering the feed gas to ensure the most efficient absorption of gas on the surface of the absorbent 5. To prevent the pores of the absorbent 5 from closing and preventing caking, its layers are alternated with layers of an inert porous material 6, for example, expanded clay. The volumetric ratio of absorbent to inert material is 2: 1. This ratio provides the most rational use of the volumes of absorbent 5 located in the space of the tank 4. The difference between the angles of repose of the absorbent 5 and inert 6 material does not exceed 10 degrees to increase the uniform distribution of the absorbent 5 and inert porous material 6 along the height of the tank 4. With a larger difference angles of repose of the absorbent 5 and inert porous mass 6 will be "wedging out" of alternating layers along the height of the tank 4, which will lead to a decrease in filtration gas supply. The used product space of the tank 4 will increase due to absorption of the supplied gas on the absorbent 5. After filling the tank volume 4 with layers of abortion 5 and inert porous material 6, the tank 4 is filled with gas by pumping it through the brine pipe 1 through the perforation channels 3. Subsequent gas selection is carried out by lowering the pressure in the product space of the tank 4 to the pressure of the buffer gas. The selection of gas is carried out through the perforation channels 3 in the brine-lifting 1 pipe.

The application of the method of creating underground gas storages in sediments of soluble rocks provides the following advantages:

- increase in the used product volume of the tank due to sorption of gas on the surface of the absorbent;

- reduction of gas storage costs.

Claims (1)

The method of creating underground gas storages in deposits of soluble rocks, including the supply of water and the issuance of brine through the water supply and brine pipes located one in another, pumping and storing gas in an underground tank, characterized in that after the brine is dispensed, the tank is drained, then by the gap between the water supply and brine, perforated in the lower part along the height of the tank and installed in its lower part, the pipes, the tank is filled with alternating layers of absorbent and inert porous material in volumetric 2: 1, and the difference between the angles of repose of the absorbent and inert material is not more than 10 °, after which the container is filled over the apertured rassolopodemnoy gas pipe.