SU1720945A1 - Method of operating underground storage and relevant plant - Google Patents

Abstract

The invention relates to underground gas and liquid storage facilities, and b. used for storing products with two phases - liquid and gaseous. The goal is to increase the safety of storing liquid products (GF) when using gas over-pressure (G) as working agents by eliminating gas emissions into the pipeline (P). Underground tanks (P) communicate with each other through wells and pipelines. One of the Ps is completely filled up to its mouth of the RH and plays the role of a hydraulic shutter. Another P is connected to the pipeline for supplying G, and its pump-compressor pipeline for transporting the LP is connected to the annular space P of the hydraulic seal. In this case, П is connected only with Р hydraulic lock. When taking oil from another reservoir, it is fed into it under pressure G. Under its action, oil is transported through surface pipelines into the annular space P of the hydraulic lock, from which liquid oil is forced out of the newly supplied product into P. water seal. A gas breakthrough is fixed by an orifice gauge of both P. 2 sec. , 1 Il. (Ls

Description

The invention relates to underground gas and liquid storages and can be used in oil and gas producing and processing industries that store gas, oil products, brine and liquefied gases in underground tanks with two phases - gaseous and liquid, in which gas is transported from the underground tank is carried out by injecting a liquid, and the transport of a liquid product is done by an overpressure gas;

There is a method of emergency shutdown of an underground gas storage, including the construction of underground reservoirs located one above the other, equipping them with pipelines and a check valve that prevents the gas from escaping to the outside.

The disadvantage of this method and installation is that the tubing and the arrangement of the tanks do not allow to perform operations to prevent

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breakthrough of gas into the pipeline for transporting fluid.

There is also known a method of operating a gas storage, which provides for the filling of reservoirs with fluid and gas hydrodynamically connected to each other through wells, transferring the working fluid to the reservoir with gas until the gas reaches a predetermined pressure and gas is withdrawn.

However, the known method does not prevent the danger of gas getting into the suction of the submersible pump and further into the liquid communications of the gas storages.

The liquid supply through pipes from one tank to the annular space of another tank is known.

In the known solution, the supply of liquid to the annular space of another container is carried out in such a way that it does not allow to avoid the possible ingress of gas, in the case of a decrease in the level below the allowable, to the inlet of the submersible pump and further to all above-ground liquid communications. The proposed technical solution for supplying the liquid to the annular space of the container, which is completely filled with it and serves as a buffer for the liquid, makes it possible to avoid gas overshoot in the communication fluid.

A known installation that contains two underground reservoirs hydrodynamically connected to each other, wellhead equipment and gas and liquid gas pipelines.

Binding of underground tanks in a known technical solution is designed in such a way that it does not prevent gas from entering communications for transporting liquid.

The purpose of the invention is to increase the safety of the operation of above-ground communications and equipment by eliminating the possibility of gas overshoot of overpressure into these communications.

This goal is achieved due to the fact that in an underground storage facility for liquid and gas in saline or other impermeable formations that have underground hydrodynamically interconnected reservoirs with wellhead equipment and gas and liquid obfuscation pipelines is connected to the annular space of the underground reservoir for storing the liquid, and the product pipeline is connected to the tubing pipes of the hydraulic seal container.

In this case, one of the tanks is completely filled with fluid to the wellhead and is used as a reservoir.

a hydraulic lock, and the extraction of fluid from another working tank into the product pipeline for its transport is carried out by gas forcing through the first tank, the hydraulic lock.

In the proposed technical solution, wrapping the containers with pipelines allows to avoid gas leakage into the product pipeline.

The drawing shows a diagram of the implementation of the method and installation for underground storage of liquid.

The diagram shows two underground reservoirs 1, 2, hydrodynamically interconnected by a pipeline 3. The underground reservoirs are equipped with tubing pipes 4, which form an annular space 5 with casing strings and gas pipe 6 and liquid 7.

The method is implemented as follows.

The gas from the compressors through the pipeline 6 enters the annular space5 of the tank 1 and then into the cavity of the tank 1, displaces the liquid therein through the tubing 4

At the same time, even with the use of mechanical and automatic means of shutting off gas, gas may slip through (reaching the speed of sound) into ground communications and facilities, which can lead to the release of gas into the surrounding atmosphere. In order to prevent an emergency situation, the fluid displacement circuit provides for the supply of fluid to an underground reservoir which is completely filled with fluid. The gas from the product tank 1, in case of its breakthrough, enters the annular space 5 of the underground tank 2, providing the necessary time for the operators to eliminate the emergency. The gas breakthrough is fixed by the wellhead manometer of tanks 1 and 2 (the pressure increases instantaneously).

The liquid is withdrawn to the product pipeline through tubing from reservoir 2.

The proposed technical solution allows:

to ensure the safe operation of underground gas and liquid storages by eliminating the possibility of gas overshoot overshoot in the pipeline communications and, as a result, to eliminate the occurrence of water hammer and the likelihood of pressure increase above the calculated one in the liquid communications;

to simplify the unreliable and costly mechanical and automatic system of protection of liquid communications from the overshoot of gas overshoot;

eliminate working environment emissions to the environment;

reduce capital investment in underground storage facilities.

Claims (2)

Invention Formula 1, A method of operating an underground storage, including the creation of underground reservoirs hydrodynamically communicated to each other through wells, pumping storage products into reservoirs while simultaneously displacing working extrusion agents, storing them in reservoirs and removing storage products by displacing them, opelling t l and h ch and with the fact that, in order to increase the safety of storing liquid products when using as a working agent gas pressure by using The gas is transferred into the product pipeline, one of the tanks is completely filled with liquid - storage product and is used as a water seal, and the liquid product is taken from other tanks, while 0 five 0 five 0 transport it to the product pipeline through the reservoir-water seal. 2. Installation for operation of underground storage, including underground reservoirs with well equipment communicated to each other through wells and pipelines, connected to tubing pipes for supplying the storage product to the reservoir and withdrawing it from the reservoir to the product pipeline and for supplying and discharging from the reservoir working agent of extrusion, characterized in that, in order to increase the safety of storing liquid products when using as working agents, pressing off gases by eliminating gas emissions from the extrusion into the pipeline, one of the tanks is made in the form of a hydraulic seal and filled to the wellhead with a liquid product, the pipeline for supplying the extrusion gas to the annular space of the other tank, its pipeline for transporting the liquid to the annular space of the hydraulic seal container and the product pipeline for transporting the fluid is connected through the wellhead equipment to the pump-compressor pipes of the hydraulic seal.  flepedafilibat with a Product 8 7 lro & mtolro-Ch